מעב לארשיל למשחה תרבח - iec.co.il. specification sr-153.pdf · criteria mentioned...

ANNEXURE 'B' SPECIFICATION SR-153

SEPTEMBER 2017

SR-153 SR-153

חברת החשמל לישראל בע"מ

THE ISRAEL ELECTRIC CORPORATION

אגף תכנון, פיתוח וטכנולוגיה

PLANNING , DEVELOPMENT & TECHNOLOGY

DIVISION

SPECIFICATION SR-153 FOR 400/170 kV , 650 MVA,

LOW-NOISE INDOOR

3-PHASE AUTOTRANSFORMER

SEPTEMBER 2017


SEPTEMBER 2017

THE ISRAEL ELECTRIC

CORPORATION

PLANNING, DEVELOPMENT AND

TECHNOLOGY DIVISION

SPECIFICATION SR-153 FOR 400/170 kV , 650 MVA,

LOW-NOISE INDOOR

3-PHASE AUTOTRANSFORMER

Draft Version A Version B Prepared D. Visan 07/16 D. Visan 10/16 D. Visan 06/17

Checked Dr. H. Ben-Haim 07/16 Dr. H. Ben-Haim 10/16 Dr. H. Ben-Haim 06/17

Approved B. Reshef 07/16 B. Reshef 10/16 B. Reshef 06/17

SEPTEMBER 2017


SEPTEMBER 2017

1

1. PURCHASER: THE ISRAEL ELECTRIC CORPORATION LIMITED

(I.E.Co.) ......................................................................................................................... 1 2. Name of Item ........................................................................................................ 1 3. Location of Project – not applicable ................................................................... 1 4. Scope of Work ...................................................................................................... 1

4.1. Scope of Supply ............................................................................................. 1

4.2. Additional Requirements ................................................................................. 3

4.3. Exclusions ....................................................................................................... 4

4.4. Instruments ...................................................................................................... 4

4.5. Special Tools and Spare Parts ......................................................................... 4

5. Terminal Points and Terminal Connection ....................................................... 5 6. ©CYBER REQUIREMENTS ............................................................................... 5 7. Quality Management System & Quality Control ............................................. 5

7.1. Quality Management System ....................................................................... 5

7.2. Quality Control .............................................................................................. 7

7.3. Interchangeability ............................................................................................ 8

8. Standard and Codes ............................................................................................. 9

9. Technical Documentation .................................................................................. 10 9.1. Requirements for Submission of Electronic Technical Documentation ....... 10

9.2. Manufacturer's Data to be Submitted with Proposal (see clause ‎9.1.2) ........ 11

9.3. Technical Documentation to be Submitted after Signing the Contract ......... 15

9.4. Instruction Book .......................................................................................... 17

9.5. Rules for Documentation Submission ........................................................... 19

9.6. Evaluation of Contractor's Technical Proposal ............................................. 21

10. Technical Requirements ................................................................................. 22 10.1. ©Environmental Considerations ............................................................ 22

10.2. Reliability .................................................................................................. 25

10.3. System Operating Conditions ................................................................. 26

10.4. Properties ................................................................................................. 28

10.4.1. Type: ................................................................................................... 28

10.4.2. ©Rating .............................................................................................. 28

10.4.3. ©Voltage Regulation .......................................................................... 29

10.4.4. ©Rated Voltages and Winding Connection ....................................... 29

10.4.5. Auto-transformer connection group... .............................................. 29

10.4.6. Highest voltage of the equipment (Um) …kV ................................... 29

10.4.7. Rated winding voltage at principal tap ............................................... 29

10.4.8. Rated ratio at principal tap...(kV/kV/kV) ........................................... 29

10.4.9. Rated ratio at maximum tap. (kV/kV/kV) .......................................... 29

10.4.10. Rated ratio at minimum tap...(kV/kV/kV) ......................................... 29

10.4.11. Guarantee ........................................................................................... 30


SEPTEMBER 2017

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10.4.12. ©Impedance (see clause 5.8. ANN 'B2') ............................................ 30

10.4.13. ©Overloads ........................................................................................ 30

10.4.14. © Geomagnetically induced currents (GICs) capability .................... 31

10.4.15. Voltage limitation ............................................................................... 31

10.4.16. Auto-Transformer Room .................................................................... 31

10.5. Design and Construction ......................................................................... 32

10.5.1. Dimensions and Weights .................................................................... 32

10.5.2. Three-phase auto-transformer insulation.. ......................................... 32

10.5.3. ©Insulation level of windings, according to IEC 60076-3/2013 and

IEC 60071-1/2006: ............................................................................................... 32

10.5.4. ©Insulation level of bushings ............................................................. 33

10.5.5. Insulation level of OLTC. .................................................................. 33

10.5.6. Cooling System .................................................................................. 34

10.5.7. Control Details of Cooling System .................................................... 34

10.5.8. ©Sound Level (Guaranteed value) ..................................................... 38

10.5.9. ©Earthing ........................................................................................... 39

10.5.10. Windings and Cores ........................................................................... 41

10.5.11. ©Tertiary Winding ............................................................................. 43

10.5.12. Auto-transformer Tank ....................................................................... 44

10.5.13. Oil and Oil Preservation System ........................................................ 50

10.5.14. Losses, Tolerances, and Warranties ................................................... 50

10.5.15. Tap Changer for Operation under Load ............................................. 51

10.5.16. Voltage control ................................................................................... 55

10.5.17. Control Cabinets and Wiring: ............................................................ 60

10.5.18. ©Bushings .......................................................................................... 61

10.5.19. ©Bushing Current Transformers ........................................................ 63

10.5.20. Accessories ......................................................................................... 66

10.6. Commissioning ......................................................................................... 73

10.7. Operation and Maintenance ................................................................... 74

10.7.1. General ............................................................................................... 74

10.7.2. Spare and Renewal Parts .................................................................... 74

11. Test and Inspections ....................................................................................... 75

11.1. Standards and Testing Specifications ........................................................ 75

11.2. Measurement Accuracy ............................................................................. 75

11.3. ©Tests ........................................................................................................ 75

11.3.1. Type Tests .......................................................................................... 76

11.3.2. Routine Tests ...................................................................................... 78


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11.3.3. Special Tests ....................................................................................... 85

11.3.4. Back to Back Test .............................................................................. 88

11.3.5. Insulation Levels and Dielectric Tests: .............................................. 89

11.3.6. Ability to Withstand Short Circuit ..................................................... 96

11.3.7. Geomagnetically induced current (GIC) Withstand Capability Test . 96

11.4. Site Acceptance Test for Auto-Transformer ............................................. 97

11.4.1. Auto-Transformer tests ...................................................................... 97

11.4.2. Current Transformer tests ................................................................... 97

11.4.3. Transformer Oil test ........................................................................... 97

11.4.4. Oil leakage test of tank ....................................................................... 97

11.4.5. Test of the transformer's auxiliaries and operation circuits................ 97

11.4.6. Dew point test shall be performed before transformer oil filling ....... 97

12. Packaging and Delivery .................................................................................. 98 12.1. ©Auto-transformer Transportation without oil and Dew Point Test......... 98

12.2. Auto-transformer Transport on Site and Lifting ........................................ 99

13. Rating plate .................................................................................................... 100 14. PROGRESS REPORT ................................................................................. 100

15. COMMENTS BY BIDDER ON ANNEXURE 'B1 ....................................... 101

16. DEVIATIONS FROM REQUIREMENTS .......................................... 102 APPENDICES .......................................................................................................... 103


SEPTEMBER 2017

page B1- 1

SPECIFICATION FOR 400/170 KV ,

650 MVA, LOW NOISE,

3 PHASE AUTO – TRANSFORMER

1.PURCHASER: THE ISRAEL ELECTRIC CORPORATION LIMITED

(I.E.Co.)

2.Name of Item

Three (3) three-phase auto-transformers for indoor installation and one three-phase

auto-transformer as reserve unit. The rated apparent power of the three-phase auto-

transformer shall be 650 MVA.

3.Location of Project – not applicable

4.Scope of Work

4.1.Scope of Supply

4.1.1.Design, develop, manufacture, preserve, pack and furnish with export packing,

the following:

Three (3) 650 MVA three-phase auto-transformers, auto-connected windings,

indoor, low-noise, oil-immersed, OFAF-cooled or ODAF-cooled or

ONAN/ONAF/OFAF-cooled.

The guaranteed sound power level of three-phase auto-transformer shall be up to

93 dBA.

The three-phase auto-transformer shall have oil-air bushings on 400 kV

terminals, 170 kV terminals, neutral and tertiary terminals.

Each three-phase auto-transformer shall be supplied complete with appurtenances

and accessories as specified herein to form a complete unit which will achieve and

assure safe and reliable operation with overall performance. Components,

appurtenances and accessories shall be of proven design, verified in operation.

The export pack for overseas shipment and delivery shipment shall be according

to Annexure 'R'.


SEPTEMBER 2017

page B1- 2

4. Scope of Work (cont.)

4.1 Scope of Supply (cont.)

4.1.2.The supply of each of the three-phase auto-transformer shall include the

following items:

- The three-phase auto-transformer itself including cooling system with oil-

air heat exchangers, fans with electrical motors, oil-pumps with

electrical motors and piping with flanges for connecting to the auto-

transformer tank, bushings, bushing current transformers and provisions for

connecting overhead conductors at the 400 kV (HV), 170 kV (LV), TV

sides, auto-transformer accessories and the instrumentation indicated in this

Specification (see clause ‎10.5.20), oil preservation system and transformer

oil, on-load tap changer, complete automation of the cooling system and

OLTC, spare parts, means for anti-seismic blocking and anchor of the auto-

transformer tank and the auto-transformer wheels on the rails after it's

installation.

- The transformer oil shall be according to “MINERAL INSULATING OIL

SUPPLIED FOR BEYOND 400 KV POWER TRANSFORMER” number

51/2016 (see Appendix no.1). The oil shall comply to test and reported

criteria mentioned in table 2 of IEC 60296 Ed.4. (2012).

- The voltage regulator system shall include the hardware and software which

is necessary to communicate with switching station's SCADA system (see

subclause ‎4.2.8). It shall meet the “CYBER REQUIREMENTS” as stated in

Appendix 12,

- The monitoring, control, and auxiliary cabinets, shall include the

necessary circuits for power supply, monitoring and control. All the

electrical connections between the cabinets and the accessories,

instrumentation mounted on the auto-transformer control cubical.

- The devices shall include, in terms of hardware and software, all the means

required for integration in a LAN and implemented protocol for serial data

communication (see subclauses ‎4.2.7 and ‎4.2.8).

- The Intelligent Electronic Device (hardware, firmware, software,

communication protocol) shall meet the “Cyber Requirements” as stated in

Appendix 12.


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page B1- 3

4. Scope of Work (cont.)

4.2.Additional Requirements

The scope of supply may include the following additional requirements:

4.2.1.The spare and renewal parts and materials shall be common to all the three-

phase auto-transformers.

4.2.2.Contractor shall furnish, if required by Purchaser, at per diem rates stated in the

proposal, competent supervision for unloading from the boat, transporting to the site

and erecting the equipment furnished under this Specification.

4.2.3.Contractor shall send, if required by Purchaser, at per diem rates stated in the

proposal, test engineers to participate in auto-transformer testing in the field as

indicated under subclause ‎11.4 of this Specification.

4.2.4.Contractor shall furnish detailed instructions, drawings and erection

diagrams to permit the Purchaser to organize the erection of all the supplied

equipment (clause ‎9.4).

4.2.5.Special Equipment, Tools and Instruments:

Contractor shall recommend all special equipment, tools and instruments required for

safe and secure transport of all components to and from the port as well as on board

ship, and for test and maintenance of equipment provided under this contract.

Auto-transformer maintenance should include a description of the troubles which

may occurred as result of late or mishandle maintenance.

4.2.6.The control and monitoring equipment (where applicable) will be integrated in

the LAN (local area network) of the substation's SCADA system (see

clauses ‎10.5.16, ‎10.5.20).

4.2.7.Direct Communication with SCADA System. The system shall be connected to

SCADA system via a TCP/IP ETHERNET LAN, using IEC 61850 protocol, and shall

meet “CYBER REQUIREMENTS” as stated in Appendix 12.

4.2.8.The monitoring instruments manufacturer shall be responsible to implement the

suitable communication interface for data transmission, hardware and software

(clause ‎10.5.20).


SEPTEMBER 2017

page B1- 4

4. Scope of Supply (cont.)

4.2 Additional Requirements (cont.)

4.2.9.The contractor shall notify the purchaser, without any undue delay, of any

defect, failure, malfunction or incompatibility in the equipment (see clause ‎7.2.4), or

in simi1ar types of equipment, which shall have appeared, or discovered in the course

of the period, extending from the execution of the contract of supply until three years

after the expiration of the warranty, in as much as it affects, or may affect the use,

performance, qua1ities, lifetime, or safety of the equipment.

The notification shall be in writing and shall specify the nature of the defect, fai1ure,

malfunction, or incompatibility, any malfunction, stemming therefrom and any

relevant corrective measures, adopted or recommended by the manufacturer.

4.3.Exclusions

Whenever equipment, features and design requirements, proposed by the

Contractor, cannot satisfactorily meet the intent of this Specification in any

respect, such exceptions must be clearly stated by the Contractor in his

proposal (clause ‎9.2.6, ‎16).

4.4.Instruments

4.4.1.Contractor shall supply all elements for sensing, conditioning and transmitting

signals from equipment within the Scope of Supply as required to assure safe, reliable

and economic operation.

4.4.2.Remote mounted instruments, monitors and controls (clause ‎10.5.20)., if any,

will be installed in an air conditioned room. However, the equipment shall be

suitable for operation in an ambient temperature range of 5 to 40C and in a relative

humidity to 90% for those periods of time when the air conditioning is out-of-

service.

4.4.3.All instruments furnished by Contractor shall be properly tagged and

prominently identified with a nameplate designation as approved by Purchaser.

A certificate of calibration, including calibration method, date calibrated, date

next calibration due and traceability to a nationally or internationally recognized

standard shall be provided for all instruments and thermocouples. All

instruments, scales, charts, gauges, recorders and the like shall have metric

graduations.

4.5. Special Tools and Spare Parts

The Manufacturer shall furnish a list showing identification of the parts which may

be required for replacement, together with the recommended initial stock of such

replacement parts (see subclause ‎10.7.2).


SEPTEMBER 2017

page B1- 5

5.Terminal Points and Terminal Connection

The three-phase auto-transformer will be employed for the coupling of two

effectively grounded systems (400 kV and 161 kV).

6.©CYBER REQUIREMENTS

- The Intelligent Electronic Device (hardware, firmware, software, communication

protocol) shall meet the “Cyber Requirements” as stated in Appendix 12.

- The “Cyber Requirements” includes: NON-DISCLOSURE AGREEMENT, CYBER

SECURITY GENERAL REQUIREMENTS, and SECURITY OF PROJECT

PERFORMED BY VENDOR ABROAD.

- The Bidder shall submit with his proposal fill-in questionnaire and a

preliminary Security Test Plan (see Appendix 12).

- The “End User License Agreement” and “Software/Firmware Maintenance

Agreement” shall be submitted with proposal and shall be included to the contract.

7.Quality Management System & Quality Control

7.1.Quality Management System

7.1.1.Definition

a. Certification Body (CB) – An independent external body authorized to confirm

that tended/supplier's Management System conforms with the requirements

specified in the standard, by issuing a certificate. The Certification Body should be

qualified to certify by an Accreditation Body.

b. Accreditation Body (AB) – An independent body, being a member of the

International Accreditation Forum Multilateral Arrangement – IAF MLA, having

authority to formally approve the competence of a certification body providing

certification services.

7.1.2.The bidder/supplier shall have a Quality Management System (QMS) having a

certificate evidencing compliance with the requirements of the valid revision of ISO

9001 or any other Management System standard specifically indicating that it

implements the requirements of ISO 9001. Which are valid on the date that specified

for submission of the proposal.

7.1.3.Approval of conformance with the ISO 9001 requirements, as indicated in

clause 7.1.2 above, shall be in a form of a certificate issued by a Certification Body

(CB) which is a qualified by an Accreditation Body [(AB), see 7.1.1)].

7.1.4.The certificate should bare the logo of the CB and of its Accreditation Body

and/or the logo of the IAF MLA.


SEPTEMBER 2017

page B1- 6

7.1.5.The certificate shall be valid on the date set for submission of the proposal.

7.1.6.The certificate shall be valid for the scope of activities requested in the request

for proposal.

7.1.7.Quality Assurance shall apply to this Contract according to clause 2

("Contractor's Documentation") and clause 3 ("Quality Assurance, Inspection and

Testing") of the General Conditions (ANNEXURE ‘A’).

7.1.8.The manufacturer shall provide, with the proposal a detailed list of his Quality

Assurance Standards (full title and number) applicable to the subject of the bid.

For the documents of the contractors QMS (Quality Management System) and its

certification see clauses ‎9.5.7 and 9.5.8.

The purchaser shall have the right to obtain any relevant quality information from the

bidder/supplier as required.


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page B1- 7

7. Quality Assurance & Quality Control (cont.)

7.2.Quality Control

7.2.1.The Bidder shall submit with his proposal a preliminary Inspection and

Test Plan (see subclause ‎9.2.2‎9.5.8).

7.2.2.A mutually agreed inspection plan, including witness and hold points, shall be

agreed between the Purchaser and the Contractor. Any subsequent alteration to this

program shall require the Purchaser's agreement, prior to start of any work affected by

these alterations.

7.2.3. Test and Inspection certificates as required in the Specification and the

applicable Standards, shall be submitted immediately following their generation. The

certificates shall be original, signed by the Contractor, and contain actual measured

values. The generation of certificates, including those generated by Subcontractors

and Sub-suppliers shall bear no extra costs to Purchaser.

7.2.4. Any Equipment non-conformance to drawings, specifications or other purchase

order requirements which are considered by the Contractor as "acceptable as is" or for

"repair" shall be submitted to the Purchaser for approval, with their recommended

dispositions. To fulfill this requirement an "evaluation of non-conformance" shall be

performed by the Contractor. The procedure shall be according to Appendix '9'. All

such non-conformances shall be approved by the Purchaser, shall be documented, and

a copy of the approval shall accompany the shipment.

7.2.5.All materials used in the manufacture of the equipment must conform to the

Specification, approved drawings and accepted Standards.

7.2.6. The tests shall be performed at a testing laboratory which is accredited to

ISO/IEC 17025 by an accreditation body which has a valid agreement with ILAC

MRA – (International Laboratory Accreditation Cooperation Mutual Recognition

Arrangement). The laboratory schedule of accreditation should cover the type of the

required tests including the BMC.

In addition the purchaser’s quality standard Q-APP-02, Rev. 4, shall apply (see

Appendix No.5).


SEPTEMBER 2017

page B1- 8

7. Quality Assurance & Quality Control (cont.)

7.3.Interchangeability

- Each three-phase auto-transformer shall be identical and interchangeable with the

other supplied auto-transformers.

- The complete control instrumentation, alarm, cooling equipment, bushings,

bushings current transformers, oil preservation system, transformer oil, tap changer

and tap-changing schemes of each three-phase auto-transformer shall be compatible

to those of the other supplied auto-transformers, so as to operate satisfactorily under

all conditions.

- All disassemble parts of each three-phase auto-transformer shall be

interchangeable electrically and mechanically with each other.

- The three-phase auto-transformer shall be designed to be interchangeable in

terms of electrical and physical parameters with the existing three-phase auto-

transformer, as seen below:

a. The electrical and physical parameters shall be based on clauses: ‎10.5.1

“Dimensions and Weights”, ‎10.5.3 “Insulation level of Windings”, ‎10.5.4

“Insulation level of Bushings”.

b. Physical details of auto-transformer including the position of coolers and

bushings are shown in Appendix 13 – INDOOR TRANSFORMER

INSTALLATION LAYOUT

c. The distance between the centerline of the rail wheels system as viewed from

the front or rear shall be 5230 mm, see Appendix 13, clause ‎12.2.8)


SEPTEMBER 2017

page B1- 9

8.Standard and Codes

8.1.Unless otherwise stated, all equipment shall be designed, constructed and tested

in accordance with the requirements of the latest published recommendations of the

International Electrotechnical Commission (IEC) and ANSI/IEEE. All aspects,

tests etc. not covered by the IEC Recommendations, shall be executed according to

the latest published issue of the official or otherwise approved standards of

Manufacturer's country. The standard used should be the version in effect at time of a

tender is submitted.

All relevant standards should be stated by the Bidder and approved by Purchaser.

8.2.Contractor may propose Standards and Codes as alternates for, or additions to

those specified herein. A copy of each proposed Standard or Code shall be included

with the proposal. In the case of Purchaser acceptance of such Standards and

Codes, Contractor remains responsible for assuring that the design and physical

interfaces between the equipment supplied according to different Standards and

Codes, are compatible.

8.3.Whenever tests and design requirements of this Specification are not compatible

with the IEC or ANSI recommendations, the demands of this Specification shall

have priority.

8.4.Definitions

The terminology used in this specification is in general according to IEC Publications

60076-1/2011, 60076-2/2011, 60076-3/2013, 60076-5/2006, 60076-7/2005, 60076-

10/2016 and Amendments thereof, unless otherwise specified. The term 'guaranteed'

used in this Specification in connection with specified quantities means that the

quantity (magnitude) to which it is applied shall be subjected to the tolerances given

in Clause 10 of IEC Publication 60076-1/2011 unless otherwise specified by the

Purchaser.


SEPTEMBER 2017

page B1- 10

9.Technical Documentation

As an addition to the provisions of clause 2 of the GENERAL CONDITIONS –

Annexure 'A' and without derogating from the generality thereof, Contractor's

drawings, data, calculations and other technical documents shall be submitted to the

Purchaser as required below.

9.1.Requirements for Submission of Electronic Technical Documentation

9.1.1.The Electronic Technical Documentation Package shall include the following

collection of the electronic files in English:

a. Electronic Tender Package (ETP) shall contain: Auto-Transformer

Specification (Annexure 'B1', Annexure 'B2', Annexure 'C', Appendix 113).

b. Electronic Bidder Proposal (EBP) shall contain: Auto-Transformer ‘Summary

of Data’- Annexure 'B2' and RAM data Appendix 7 (see clause ‎9.2).

c. Electronic Contract Technical Documentation Package (ECTDP) shall contain

the complete engineering design: Auto-Transformer ‘Summary of Data’ -

Annexure 'B2', ‘Summary of Price’ - Annexure 'C', Technical Documentation

of the auto-transformer (see clause ‎9.3), fill-in appendix “Security of project” (Appendix12).

9.1.2.The EBP and ECTDP shall be hosted in a CD-ROM. All CD-ROMs should

be clearly labelled or marked to indicate the tender number, the name of the

Bidder, and the disk number if more than one CDROM is submitted. Each CD-

ROM shall have a "README.rtf" file in the root directory. This file shall

contain general guidance on the list of the electronic files in the electronic

package.

9.1.3.The CD shall be “write-once” type and “closed”. The re-writable CD media

shall not be used. The CD package shall be properly packed and protected to avoid

physical damage during the submission process.

9.1.4.The electronic documents shall be submit: as (*.pdf) , the 'Summary of Data' as

electronic Excel format (*.xlsx), the drawings as (*.dwg) and (*.pdf) format. The file

types shall be distinguished by the filename extension.

9.1.5.File compression programs should not be used to compress files. The electronic

files of an EBP and ECTDP shall not contain any computer instructions, including but

not limited to: (a) computer viruses; and (b) macros, scripts and fields that

depend on the execution environment and the execution of which will cause

changes to the electronic file itself or the information system displaying the

electronic record.


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9. Technical Documentation (cont.)

9.2.Manufacturer's Data to be Submitted with Proposal (see clause ‎9.1.2)

9.2.1.The completed 'Summary of Data' - Annexure 'B2' (see attached .xlsx file).

9.2.2.Quality control documentation as described at subclause ‎9.5.8 and clause ‎7.2.

9.2.3.The Manufacturer's Specification and description of the equipment.

9.2.4.Type and Routine test report of similar low noise indoor three-phase auto-

transformer.

9.2.5.The manufacturer shall provide a detailed oil-filled transformer diagnostic

maintenance plan, including the schedule for periodic retesting and inspections (see

clause ‎10.7).

9.2.6.Exceptions to Purchaser's Specification. If there are no exceptions, a

specific statement to this effect is required. Only specific items listed in response

to this question will be considered as exceptions to the Specifications (see

ANNEXURE 'B1' – clauses ‎4.3, ‎16 and ANNEXURE 'B2' - clauses 8, 9 'Summary of

Data').

9.2.7.Dimension drawings giving main dimensions and weights (oil, shipping etc.) for

three-phase auto-transformer (clause ‎b‎10.5.1) including detailed drawing of auto-

transformer rail wheels system (see subclause ‎12.2.8), sound reduction means (see

subclause ‎10.5.12.7).

9.2.8.Description of anti-noise measures (see subclause 10.5.12.7) as: core sheets

with small magnetostriction, steel sheet dampers, sound barrier sheet panels mounted

on the tank walls, low-noise coolers, sound barrier enclosure (subclause ‎10.5.12.8)

etc.

9.2.9.Description and drawing of windings and core arrangement including the

location of windings and relative screens to the core and tank , the location of the

HV, LV, TV and neutral bushings.

9.2.10. Description and drawings of auto-transformer internal and external earthing

system and core grounding schematic diagram (see clause ‎10.5.9).

9.2.11.Drawings, technical data and type test reports for oil-air bushings (see

clause ‎10.5.18).

9.2.12.Description, technical data and catalogue of cooling system (pump motor and

fan), including electric characteristics and oil air coolers power dissipation/inlet oil

temperature curves, “Power and Control Voltage Supply Diagram” and the

”Automatic Control Diagram” (see clause ‎10.5.6).

9.2.13.Preliminary drawings of the cooling system arrangement on the three-phase

auto-transformer tank and the minimum clearances between cooling system and fire

walls (where applicable) .

SR153AnnB2.xlsb#'clause 8.'!A3

SR153AnnB2.xlsb#'clause 9.'!A3


SEPTEMBER 2017

page B1- 12


9.2 Manufacturer's Data to be Submitted with Proposal (cont.)

9.2.14.Recommendation and technical data for a water fire extinguishing system

(sprinkler) for preventing fires in leaked flammable insulation and cooling fluids for

auto-transformer with sound enclosure.

9.2.15.Description of welding procedure (see subclause 10.5.12.16).

9.2.16.General information and drawings covering the principle design, technical data

and type tests of the OLTC, motor drive mechanism and voltage control equipment,

(see subclauses ‎10.5.15 and 10.5.16) including software documentation .

9.2.17.Schematic diagrams for voltage control and parallel operation system of up to

three auto-transformers (see subclause 10.5.16 and 5.21.19 ANN. B2).

9.2.18.Detailed description of temperature rise test (see subclause ‎11.3.1a) based on

cooling system stages (reduced, partial and full forced cooling, see subclauses

‎10.5.6.1 and 5.6 ANN 'B2').

9.2.19.Back to Back test procedure and connection diagram including test

instruments (clauses ‎11.3.4).

9.2.20.GIC test procedure and connection diagram including test instruments

(clauses 11.3.7).

9.2.21.Detailed description of calculation, calibration of the winding temperature

monitor (see subclause ‎10.5.20.1.1) and recommendations for the setting points

(coolers start and stop hot-spot values) based on temperature rise test , cooling system

stages and continuous throughput rating for the cooling stages (reduced, partial and

full forced cooling, see subclauses ‎10.5.7.1 and 5.6 ANN 'B2').

9.2.22.Transport instructions and transport drawings. The transport drawings shall

include the position of the center of gravity, the types of trailer which can be used,

and transport weights (see subclause 12.2).

9.2.23.The Bidder shall fill in the sound pressure and sound power levels required

data at the clauses 5.30. or 5.31. ANNEXURE ‘B2’ based on auto-transformer

design with or without noise reduction walls.

9.2.24.Description of the sound power level calculation for the auto-transformer (see

clause ‎0 ).

9.2.25.Description of the dielectric tests procedure and connection diagram of the

auto-transformer, voltage sources and instrumentation that Manufacturer intends to

use for each dielectric test (see clause ‎11.3.5).

SR153AnnB2.xlsb#'clauses 5.1 to 5.10'!A32


SR153AnnB2.xlsb#'clause 5.27-5.32'!A131



SEPTEMBER 2017

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9.2.26.Description of measures for control of stray flux (see subclause ‎10.5.12.21).

9.2.27.Description of the method for determining the number of pressure relief device

(see subclause ‎10.5.12.19).

9.2.28.Description of oil preservation system, including technical specification for oil

(see clause ‎10.5.13, Appendix 'A' and 'B' of Appendix no.1).

9.2.29.Technical specification of thermally upgraded paper. The paper shall comply

with the general requirements given in IEC 60554-3-5/1984.

9.2.30.Technical specification of pressboard. The pressboard shall comply with the

general requirements given in IEC 60641-1/2007.

9.2.31.Description and technical data of the direct (fiber optic) winding temperature

monitor, comprehensive technical specification of each item (see

subclause ‎10.5.20.1.2).

9.2.32.Description and technical data of the fiber optic probe.

9.2.33.Preliminary drawing of windings and core arrangement including the position

of the fiber optic temperature probes inside the transformer winding, core.

9.2.34.Description and technical data of the On-Line DGA monitoring system

(subclause 10.5.20.3).

9.2.35.Description and technical data of the On-Line Partial Discharge Monitoring

System for connection to the bushing test tap, including technical specification of

each item, software and communication protocol documentation (see

subclause ‎10.5.20.10).

9.2.36.Description and technical data of the UHF Fixed Internal Couplers, including

technical specification (see subclause 10.5.20.9).

9.2.37.Description and technical data of the GIC Monitoring System, including

technical specification (see subclause ‎10.5.20.11).

9.2.38.Description and technical data and catalogue for all accessories (see subclause

‎10.5.20).

9.2.39.Preliminary drawing of auto-transformer tank including the optical

feedthroughs tank wall plate and the junction box enclosure, and core grounding

bushings box location on the transformer cover including core bushings map

designation, UHF couplers location.

9.2.40.Description and technical data for control enclosure (see clause ‎10.5.17).

9.2.41.Description of the safety provisions on the auto-transformer cover which make

possible to tie the workers safety belts (see subclauses ‎10.5.12.18.3 , ‎10.5.12.18.4).

9.2.42.Painting instructions (see subclause ‎10.1.5 and Appendix no. 3).


SEPTEMBER 2017

page B1- 14



9.2.43.Description and diagram showing location, number and rating of lightning

arresters, high voltage capacitors and other means for protection of the tertiary

winding from surge overvoltages and from power frequency voltage transferred

capacitively (see subclause ‎10.5.11).

9.2.44. Detailed description of the engineering design tools used to fulfill the transport

and lifting requirements as described at clause ‎12.2.

9.2.45.The contractor shall include any other drawings, catalogues, descriptions

and photographs necessary to present a clear picture of the type and class of

equipment being submitted.

9.2.46.The Bidder shall submit as part of the proposal the software and the

communication protocol documentation for voltage regulator (see clause ‎10.5.16.5).

9.2.47.The Bidder shall submit as part of the proposal the “End User License

Agreement” of each IED (Intelligent electronic device) accessories (see

clauses: ‎10.5.20.1.2, ‎10.5.20.3.8,‎10.5.20.10 ,‎10.5.20.11, ‎10.5.20.13).

9.2.48.The Bidder shall submit with his proposal fill-in questionnaire and a

preliminary Security Test Plan (see Appendix 12 and subclause ‎6).

9.2.49.The Bidder shall submit with the proposal the Appendix 7 (RAM) filled in.

9.2.50.List of spare parts (see subclauses ‎4.5, ‎10.7.2).

9.2.51.Reference List for digital temperature monitoring and direct (fiber optic)

temperature monitor (see subclaues ‎10.5.20.1.2).

9.2.52.Reference List for On-Line Dissolved Gas Analysis (see subclaue ‎10.5.20.3)

shall include at least 3 manufactures that can be contacted directly for opinion.

9.2.53.Reference List for On-Line GIC Monitoring System (see subclaue ‎10.5.20.11)

shall include at least 3 manufactures that can be contacted directly for opinion.

9.2.54.Reference List for On-Line Partial Discharge Monitoring System (see

clause ‎10.5.20.10) shall include at least 3 manufactures that can be contacted directly

for opinion.

9.2.55. Reference List for UHF partial discharge system (see clause ‎10.5.20.9).

9.2.56.Reference List for Moisture in Oil Instrument (see clause ‎10.5.20.13).

9.2.57.Reference List for voltage regulator system (see clause ‎10.5.16).

9.2.58.Reference List of similar indoor high voltage low noise transformer/auto-

transformer delivered.


SEPTEMBER 2017

page B1- 15


9.3.Technical Documentation to be Submitted after Signing the Contract

9.3.1.The Contractor shall submit the complete engineering design within 45 days

from the signing date of the Contract.

9.3.2.The Contractor shall submit to IEC for approval: drawings showing plan and

elevation views of the auto-transformer and shall be submitted as electronic files in

both DWG and PDF format (see clause ‎9.1), as well as: - Finally external outline including plan of the base and mechanical loading of the

foundation, 30 days after sign of Contract;

- General Dimensions Drawing of the auto-transformer including sound reduction means

(see subclause 10.5.1, 10.5.12.7)

- Drawings of the wheels and details of mounting (see subclause ‎12.2);

- Drawings of the anti-seismic blocking and anchor of wheels (see clause ‎4.1.2) and

proposal drawings (recommendation) of the anti-seismic blocking and anchor of the auto-

transformer tank (and auto-transformer wheels) according to seismic qualification level

requirements stated in IEEE std.693/2005 (see clause ‎10.1.3 and subclause ‎10.5.12.5);

- Drawings of auto-transformer internal and external earthing system and core bushings map

designation (see subclause ‎10.5.9);

- Standard instruction booklets for coolers;

- HV and LV connection schemes (rating plate drawing 13);

- Drawing of auto-transformer tank including: the optical feedthroughs tank wall plate and the

junction box enclosure (subclause ‎10.5.20.1.2), core grounding bushings box location on

transformer cover (see subclause ‎10.5.9.5), PD monitoring system (subclause ‎10.5.20.10),

UHF Fixed Internal Couplers (subclause ‎10.5.20.9), On-Line Dissolved Gas Analysis

(subclause 10.5.20.3);

- Drawings and technical data of the cooling equipment (see subclause ‎10.5.6 and clause 5.22

Ann. ‘B2’ );

- Wiring drawings of the cooling system, Power and Control Voltage Supply Diagram and

Automatic Control Diagram (see subclauses ‎10.5.17 ,‎10.5.7 );

- Drawings, technical data and test reports of bushings (see subclause ‎10.5.18);

- Drawings, technical data and test reports of bushing current transformers (see subclause

‎10.5.19);

- Drawings, technical data, schemes and test reports of on-load tap changer (OLTC and

motor-drive mechanism, see subclause ‎10.5.15 and clause 5.21 Ann. ‘B2’);

- Drawing of windings and core arrangement including the position of the fiber optic

temperature probes (see subclauses ‎10.5.10, ‎10.5.20.1.2);

- Drawing, technical data, calibration procedure, scheme for UHF system (see subclause

‎10.5.20.9 and 5.33.11 Ann. ‘B2’);

- Drawing, technical data, calibration procedure, scheme for bushing's PD system (see

subclause ‎10.5.20.10 and 5.33.8 Ann. ‘B2’);

- Drawing, technical data, calibration procedure, scheme for GIC system (see subclause

‎10.5.20.11 and 5.33.13 Ann. ‘B2’);

- Schematic diagrams for voltage control and parallel operation between up to four auto-

transformers (see clause ‎10.5.16), software package specification, including configuration

chart and software operating instructions.



SR153AnnB2.xlsb#'clause 5.33'!A336




SEPTEMBER 2017

page B1- 16


9.3 Technical Documentation to be Submitted after Signing the Contract (cont.)

9.3.3.Details of Additional Requirements -Wiring schematics of all accessory equipment (see clauses ‎10.5.17, ‎10.5.20) furnished

with the auto-transformer, including connections to on-load tap-changer;

- Software package, “end user license agreement” and “software/firmware

maintenance agreement”, communication protocol documentation for all

the intelligent electronic devices furnished with the auto-transformer;

-Fill-in “SECURITY OF PROJECT PERFORMED BY VENDOR ABROAD”

questionnaire and Security Test Plan shall be submitted for approval prior to

project design and shall be included in the contract (Appendix 13).

- Marking system;

- A complete list of equipment requiring grease and/or lubricating oil with the

name, specification and quantity of grease and/or oil required for storage,

erection, start-up and/or maintenance;

- Design criteria, calculations and drawings in sufficient detail to permit

effective evaluation of the complete design (see clause 5. , Ann ‘B2’);

- Detailed instructions for long term storage near the sea shore (see clause ‎10.1);

- Erection drawings, including such details as how parts are to be assembled

(welded) and inspected on-site;

- Erection sequence drawings, if applicable;

- Assembly drawings shall include manufacturer's markings and locations

for all the items sent separately from the auto-transformer (these items shall

be pre-assembled and labeled by the manufacturer in his factory);

- A comprehensive outline as to the extent of field wiring, disassembling,

reassembling, cleaning, checking, inspecting, painting, testing, etc. required to

be done by the Erector;

- A comprehensive outline as to the extent of field fabrication required and

as to all temporary work scaffolding, blocking, shoring, hanging, heating,

wiring, disassembling, reassembling, welding, preheating, stress relieving,

cleaning, checking, inspecting, insulating, painting, testing, etc., required to be

done by Purchaser;

- Manufacturer shall supply a full list of all other tests performed during

production with corresponding results;

- Detailed instructions for the maintenance of all components, systems and

subsystems, as applicable;

9.3.4.The above mentioned drawings of auto-transformer base shall include the

following information:

- Arrangement and size of the base members;

- Width and length of each bearing member;

- Load on each bearing member;

- Center of gravity of loads;

- Location of jacking points;

- Center line distance between piers;

- Number of piers.



SEPTEMBER 2017

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9.3 Technical Documentation to be Submitted after Signing the Contract (cont.)

9.3.5.Any subsequent change in general design principles, in drawings

indicated under sub-clauses 9.3.2, 9.3.3 and 9.3.4 above, or of any other nature

in carrying out the work, shall be notified to Purchaser and may be carried

out only with Purchaser's written consent.

9.3.6.The ECTDP shall be according to clause ‎9.1.1.c

9.4. Instruction Book

The Instruction Book shall include for all equipment supplied within the contract, the

technical information, drawings, diagrams and prescriptions required for:

9.4.1.Assembly on site.

9.4.2.Commissioning and site testing.

9.4.3.Transport to the site.

9.4.4.Operation.

9.4.5.Maintenance.

9.4.6.Checking.

9.4.7.Overhauls.

9.4.8.Dismantling.

9.4.9.Information for ordering renewal and spare parts.

9.4.10.Indications for storage before erection under the environmental conditions

as specified in subclause 10.1.

9.4.11.Detailed description of auto-transformer and auto-transformer-oil tests and

treatments; before, during and after the auto-transformer filling with oil (see

Appendix 1, number 51/2016)

9.4.12.Loading guide for the auto-transformer.

9.4.13.Technical data for all the equipment supplied within the contract.

9.4.14.Detailed description and recommendation for change of the shabby items by

spare parts.

9.4.15.Transport of the auto-transformer on site and lifting (see clause ‎12.2).

9.4.16.Drawings of the wheels and details of mounting.

9.4.17.Schematic and wiring diagrams of the cooling system (see subclause 10.5.7)


SEPTEMBER 2017

page B1- 18


9.4 Instruction Book (cont.)

9.4.18.Drawings of three-phase auto-transformer internal and external earthing

system, core bushings map designation (see subclause ‎10.5.9).

9.4.19.Drawings of the means for the anti-seismic blocking and anchor of wheels (see

clause ‎10.1.3 and subclause ‎10.5.12.5);

9.4.20.HV and LV connection schemes (rating plate drawing, clause ‎13).

9.4.21.Detailed description of forced cooling equipment, including recommendations

regarding the setting points of each cooling stage (coolers start and stop hot-spot

temperature values- clause ‎10.5.7.1 , clause 5.22.5 Ann. ‘B2’).

9.4.22.Drawings, technical data, and test report of bushings (see subclause ‎10.5.18).

9.4.23.Description, technical specification and calibration procedure of bushing's PD

system (see subclause ‎10.5.20.10).

9.4.24.Description, technical specification and calibration procedure of the UHF

Fixed Internal Couplers type plate, including technical specification of each item (see


9.4.25.Description and technical data of the On-Line DGA monitoring system

(subclause 10.5.20.3).

9.4.26.Description and technical data of the On-Line GIC monitoring system

(subclause 10.5.20.11).

9.4.27.Bushings detailed instruction of cleaning and drying (supplied by bushing's

Manufacturer).

9.4.28. Description and technical data for control enclosure (see clause ‎10.5.17)

9.4.29. Drawings, technical data, test report, schematic and wiring diagrams of on-

load tap changer and motor-drive mechanism (see clause ‎10.5.15).

9.4.30.Schematic and wiring diagrams for voltage control and parallel operation

system up to four auto-transformers (see clause ‎10.5.16).

9.4.31.Wiring diagrams of all the accessory equipment (see clause ‎10.5.20, ‎10.5.17)

furnished with the three-phase auto-transformer.

9.4.32.Detailed description of local winding temperature indicator calibration and

calculation (see subclause 10.5.20.1.1).

9.4.33.Description and technical specification of the direct (fiber optic) winding

temperature monitor and fiber optic probes, including optical probe (signal)

parameters (see sub-clause ‎10.5.20.1.2, sub-clause 5.33.4.3 Ann. ‘B2’).

9.4.34.Drawing of windings and core arrangement including the position of the fiber

optic probes inside the transformer (see subclause 8.1.3., IEC 60076-7/2005).

9.4.35.Drawing of auto-transformer tank including the optical feedthroughs tank wall

plate and the junction box enclosure.

9.4.36.Specification and drawing of auto-transformer conservator synthetic membrane

(see subclause ‎10.5.12.23.2).




SEPTEMBER 2017

page B1- 19


9.4 Instruction Books (cont.)

9.4.37.Software package documentation, communication protocol documentation

of each IED furnished with the auto-transformer (subclause ‎10.5.20).

9.4.38.“End User License Agreement”, “Software/Firmware Maintenance

Agreement” of IED accessories and voltage regulator system furnished with the auto-

transformer shall be included in the contract (subclauses ‎10.5.20, ‎10.5.16.5).

9.5. Rules for Documentation Submission

9.5.1.Design information must be submitted in written form as certified drawings

or official letters during the design period of the project. The fact that such

design information may later be included in the instruction books does not release

Contractor from compliance with this requirement.

9.5.2.If the prints are returned by the Purchaser and stamped "Approved Except as

Noted", or relevant remarks are made in writing referring to the drawings, Contractor

shall correct the drawings per the Purchaser's marking and shall resubmit required

copies of the corrected drawings as stated above.

9.5.3.After approval of the above drawings, Contractor shall submit to IEC for

approval three (3) sets of complete instruction books as may be required for

erecting and one (1) equivalent electronic print (pdf)(see clause ‎9.1.5), operating and

maintaining the equipment. Instruction books shall include such drawings,

illustrations, lists, commissioning and periodic test etc., as may be required to

give Purchaser complete information for ordering of spare parts and dismantling

the equipment.

9.5.4.After final review of the above drawings and instructions books, but not later

than six months before shipment, Contractor shall submit to the Purchaser the

following:

- Complete list of all drawings Contractor intends to furnish to Purchaser.

- Ten (10) sets of prints of all the drawings and one (1) equivalent electronic

print (pdf) of each of these drawings.

- Five (5) sets of instruction books and one (1) equivalent electronic print (pdf)

(see clause ‎9.1.5 ).Books shall be furnished at time of shipment of equipment.

9.5.5.All data and descriptive material in the above drawings and instruction

books shall be in English. All dimensions shall be stated in the metric system.

9.5.6.In addition to the drawing requirements, Contractor shall furnish a

comprehensive outline as to the extent of all temporary wiring, welding, cleaning,

checking, inspection, painting, reassembling, disassembling, testing etc., required to

be done by the Erector.


SEPTEMBER 2017

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9.5 Rules for Documentation Submission (cont.)

9.5.7. Contractor shall provide two (2) copies of its Quality Manual and a full

description of its Quality Management System including the contents of its procedures

(full title and number) Furthermore the contractor shall indicate specific working

and/or inspection/test instructions/orders (see clause 9.5.8 subclauses b to f, here in

after) and certifications and or accreditations applicable to the subject of the bid.

9.5.8. Contractor shall furnish also the Quality Control documentation:

a. A certificate demonstrating that the contractor have a Quality Management

System (QMS) which complies with this requirements of ISO 9001:2000/ ISO

9001:2008. The certificate should be granted by a Certification Body (CB) which is

a part of or belong to an International Certification Network of CB's. Furthermore

the CB should be accredited by an Accreditation Body which is a member of the

International Accreditation Forum Multilateral Arrangement (IAF MLA).

The certificate should bare the marks of : the CB, the above indicated Certification

Network of CB's and of its Accreditation Body.

The scope of activities indicated in the certificate of the QMS, should specifically

cover the scope of work required by the tender/spec.

Note: An existing and valid certification to the requirements of ISO

9001:2000 shall be acceptable until the end of 2010. After Jan. 1st. 2011 only

certifications to ISO 9001:2008 shall be acceptable Quality Control Procedures

(see clause 12);

b. Qualification of Subcontractor’s Procedure;

c. List of qualified suppliers of the most important parts and Components;

d. Inspection and Test Plan included in Contractor's Quality Plan;

e. Electrical testing Procedures as per applicable Standards;

f. Non-conformance's Procedures.

9.5.9.As soon as possible after tests, but before delivery of the auto-transformer,

Contractor shall submit to the Purchaser ten (10) copies and one (1) equivalent

electronic print (pdf) of each of test reports of the auto-transformer. The test report

shall include: Type tests (first auto-transformer) , Routine tests, Special tests), Test

of Unused Insulating Oil (see Appendix 'B' of Appendix no. 1 – 51/2016 ) ,test of HV

, LV , TV bushings and bushings CT as well as for the OLTC (including the motor-

drive mechanism), FAT of voltage regulator system, FAT of all the IED accessories.

The test reports shall be submitted to Purchaser.

9.5.10.Contractor shall supply two (2) months before delivery of equipment to the

Purchaser, three (3) sets of the complete Bill of Materials to enable the Purchaser

to check and identify the equipment when received.

9.5.11.The list of types and standards specification for all materials, included

specifically parameters of steel and copper, conductor sizes, insulating materials,

sound reduction means, outside and inside paint type, etc. actually used in the

construction of the three-phase auto-transformer shall be included.


SEPTEMBER 2017

page B1- 21


9.5 Rules for Documentation Submission (cont.)

9.5.12.All submittals of drawings or other data by the Contractor shall include, as

a minimum, the following identifying information:

a. Purchaser's name.

b. Station or project name.

c. Unit number.

d. Purchaser's order number or contract number.

e. Supplier's order number.

9.5.13.All drawings shall be shipped by Air Mail or Air Express and addressed

to The Israel Electric Corporation Limited, P.O.Box 10, Haifa, Israel.

9.6.Evaluation of Contractor's Technical Proposal

9.6.1.Contractor's offer data and parameters as well as definite answers and comments

will be evaluate from technical point of view using an expert computer program for

decision making. The decision making process consist of identifying all relevant

criteria and attaching to each criterion an appropriate weight for technical evaluation.

All proposals (alternatives) made by different contractors will be evaluated taking into

account the same relevant criteria. The computer program uses an pairwise

comparison technique which will evaluate the criteria importance and to rank

alternatives (proposals).

9.6.2.Israel Electric Co. keeps the right to demand any clarification and/or

technical documentation to demonstrate any answer of bidder offer.

9.6.3. The main criteria used for the technical evaluation are according to the main

paragraphs in this Specification as follows: Electrical Data (Annexure ‘B2’), Tests,

Design and Construction, Operating Experience (in the world and Israel), RAM

(Reliability, Availability and Maintainability - Appendix 7), Technical Support, Cyber

security requirements (see clause ‎6). All subclauses for which different contractors

offer different technical data will be evaluated according to the sub-criteria of the

relevant main criteria as submitted at Attachment 3 and Attachment 4 of the

GENERAL CONDITIONS.

The clauses and the subclauses in this Specification indicated by the symbol

are compulsory requirements. The subclauses of a compulsory clause are

compulsory requirements as the main clause. The bidder's proposal will be

almost certainly disqualified, whether the proposal clauses will not comply with

one of the compulsory requirements. The compliance with compulsory

requirements will be enough, but not limited to, for the offer qualification.

Bidder's proposal will be disqualified, if his proposal will not meet the major

requirements according to "good engineering" usage for the relevant technology.

SR153AnnB2.xlsb


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page B1- 22

10.Technical Requirements

The scope of work of the technical requirements shall consist of the design,

manufacture, testing, supply, storage, along with instructions for installation and oil

filling, site testing, commissioning and placing in successful operation.

It is not the intention of this Specification to specify the detail design of the

auto-transformer. This will be the responsibility of the contractor who shall

furnish the auto-transformer, which shall meet in all respects the

performance specification and will have satisfactory durability.

10.1.©Environmental Considerations

The auto-transformer shall be indoor type. The environmental conditions of electrical

equipment room (see clause ‎10.4.16) are covered by IEC Publication 60721-3-

3/1996. The Operating Environments (clause 4. ANN 'B2') of the auto-transformer

located in Ventilated Indoor Spaces is 3K4/3Z8/IE32, see below.

group Description Class Condition – IEC 60721-3-3

K Climatic conditions 3K4 – see Table 1

Z Special climatic conditions 3Z8 – see Table 2

Standardized environmental condition IE32 – see Annexure ‘D’

10.1.1.Service Conditions

a. Altitude......................……....

not exceeding 1000 m

b. Maximum ambient temperature …….. not exceeding 45C – Annexure ‘A’,

Table A.2.1, IEC 60721-3-3

c. Minimum ambient temperature …….. +5C

d. Weather protected location…… partially weather protected location

(sheltered location): direct weather

influences are not totally excluded

e. Water from sources other than

rain..........................

spraying water jets with water velocity 10

m/sec.

SR153AnnB2.xlsb#'clauses 1 to 4 '!A75


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page B1- 23

10. Technical Requirements (cont.)

10.1. Environmental Considerations (cont.)

10.1.2.Electromagnetic Environment

Service conditions shall be according to IEC Publication 60255-22, part 1,2,3,4.

The electromagnetic environment severity levels of the electronic devices delivered

with the auto-transformer are listed below:

a. Electrostatic discharge ………… 4 kV

b. Radio frequency interference …….. 10 V/m

c. Electrical 1 MHz burst disturbance ….. 2.5 kV

d. Fast transients ……………. 2 kV

10.1.3.Seismic design of the indoor three-phase auto-transformer

10.1.3.1. The seismic design of the three-phase auto-transformer installed on his

foundation shall be based on the seismic qualification requirements stated in IEEE

Std. 693/2005.

10.1.3.2.The required seismic qualification level for transformer shall be "moderate

level".

10.1.3.3.The three-phase auto-transformer shall be tested or analyzed to prove the

seismic design. The seismic tests shall be according to subclause 11.3.2‎0

10.1.3.4.The manufacturer shall calculate the anchorage forces between the

transformer and the foundation and shall provide adequate means to anchor the

transformer to the foundation. A list of forces acting on the foundation shall be

provided to the foundation designer. These means will not increase the vibration of

the auto-transformer.


SEPTEMBER 2017

page B1- 24



10.1.4.Special Requirements for Environmental Protection

The auto-transformer shall be installed in Ventilated Indoor Spaces.

The Operating Environments is 3K4/3Z8/IE32 (see clause 10.1.1).

Due to the environmental conditions to which the equipment may be subject during its

service life, the following requirements for its protection form an integral part of the

specification and are in addition to the standard design and protective measures which

the manufacturer would normally invoke for these conditions:

10.1.4.1.When dimensionally and functionally allowable, all steel components of the

equipment are to be hot dip galvanized according to Israeli Standard 918/88 or

ASTM A123/2009. The thickness of the zinc shall be at least 100 microns on average

with no measured thickness to be less than 90 microns.

10.1.4.2.Stainless Steel hardware shall be used for external connections. Stainless

bolts and Silicon Bronze nuts shall be used for internal electrical connection. The

Stainless Steel bolts shall be according to DIN-933 A2.

The Stainless Steel nuts shall be according to DIN-934 A2.

The Silicon Bronze nuts shall be according to C65500.

Black Oxide hardware shall be used for internal mechanical connection such as core

frame etc. The black oxide hardware shall be according to Mil-C-13924 Grade 3.

10.1.4.3.Components such as springs, pins and those for which a tight maintained

dimensional tolerance is required shall be made of stainless steel. The preferred

stainless steel is an austenitic grade; however, if physical requirements are overriding,

other stainless steel grades will be acceptable.

Austenitic grades will be subject to a solution quench. Prior to being placed into

service all stainless steel components will be cleaned.

10.1.4.4.All expose aluminum components shall be fabricated from grades of

aluminum which show resistance to salt spray and moist conditions; e.g., Al-Mg base

alloys. Aluminum-Copper Alloys are not acceptable. After fabrication, all aluminum

components shall be anodized to ASTM B580/2004 Grade 4, or equivalent.

10.1.4.5.All copper or copper alloy components shall be electrolytically tinned to

ASTM B579/2004 Grade 4 or equivalent.

10.1.4.6.Components such as sleeves or bushings which may be fabricated having an

inner face of one metal and a supporting outer face of another, or conductors which

are used with connectors of a dissimilar metal, are to have their exposed interfaces

protected against moisture.


SEPTEMBER 2017

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10.1.4 Special Requirements for Environmental Protection (cont.)

10.1.4.7.All bearings shall be sealed type bearings. The seal shall be guaranteed to

be protective against sand, salt spray and moisture for a minimum period of 10 years.

10.1.4.8.All auto-transformer components shall successfully withstand in operation

the climatic and environmental conditions as defined under ‎10.1.1 and meet all

requirements under ‎10.1.2 inclusive.

10.1.5.Painting

10.1.5.1.All exposed metal surfaces of the auto-transformer not machined shall be

thoroughly sand or shot blasted and cleaned of all rust , scale , grease , oil and dirt ,

and filled and primed with one coat of "Epoxy Primer with zinc-phosphate” (similar

to coating system - option C in Appendix no.3).

10.1.5.2.The painting shall be according to enclosed Specification 2009-217-141707

(see Appendix no.3).

10.1.5.3.The finish and painting of the tank shall be enabled with the service

conditions specified under subclause ‎10.1.1.

10.1.5.4.The procedure shall permit re-finishing and re-painting after local repair.

10.1.5.5.The Bidder shall indicate in the Proposal the finish and painting procedure

for the auto-transformer tank and for the main auxiliary components.

10.1.5.6.Painting tests for the auto-transformer components shall be provided for each

delivered auto-transformer and shall be enclosed to the test report. It shall be

according to clause 4 of Appendix no. 3.

10.2.Reliability

The Bidder shall submit with the proposal all the data required in Appendix ‘7’ -

RELIABILITY, AVAILABILITY, MAINTAINABILITY (RAM).


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10.3.System Operating Conditions

10.3.1.The rated power of the three-phase auto-transformer shall be 650 MVA. The

overload capability will be in accordance with IEC60076-7/2005 – Table 4 and

IEC60076-1/2011 (clause 5.1) recommendation.

10.3.2. Three (3) auto-transformers will be connected to the switching station bus.

The station control system will be suitable for parallel operation of up to four three-

phase auto-transformers, with the capability of selecting any of the four auto-

transformers as Master.

10.3.3.System short-circuits parameters are as follows:

a. Auto-transformer operation at a voltage 5% above rated voltage.

b. The maximum symmetrical short-circuit power (short-circuit current) on each

busbar shall be:

- 400 kV - 45,000 MVA (63 kA).

- 161 kV - 15,000 MVA (50 kA).

c. The ratio X / X0 +is in the range of 0.9 to 3.

d. Minus tolerance for the short circuit impedance of the auto-

transformer.

e. Regarding all faults , i.e. on all external sides.


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10.3. System Operating Conditions (cont.)

10.3.4.The 400 kV and 161 kV systems have the following main characteristics:

400 kV system 161 kV system

a. Rated system voltage

(line to line)...(kV)

400 161

b. Highest system voltage

(line to line)...(kV)

420 170

c. System grounding..........

Effectively

Grounded

Effectively

Grounded

d. Earth fault factor

....not exceeding

1.3

1.3

e. Symmetrical short circuit

current (r.m.s)........(kA)

63

50

f. Single phase short circuit

current (r.m.s).............(kA)

63

50

g. Rated duration of

short-circuit current ....(sec)

1

1

h. Rated frequency …..(Hz)

50 50

i. Rated dynamic current

.......(kA peak)

170

135

j. Line surge impedance....( Ω )

270 375

k. Temporary overvoltages (load

Rejection + earth fault) .......(kV r.m.s) 3

420 1.3

3

170 1.3

10.3.5.Parallel Operation

The three-phase auto-transformer shall be suitable for parallel operation with up to

four three-phase auto-transformers of the same type and comparable ratings at rated

voltage and on taps of like ratio (see clause ‎10.5.16).


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10.4.Properties

10.4.1.Type:

The three-phase auto-transformer shall be: 50 Hz, three windings: primary,

secondary and tertiary ,oil immersed ,the OLTC shall be mounted on the

common neutral. The cooling method shall be: OFAF or ODAF or

ONAN/OFAF/OFAF or ONAN/ODAF/ODAF. It shall be installed in ventilated

indoor facilities. The guaranteed sound power level shall be up to 93 dBA (see

clause 10.5.8).

The three-phase auto-transformer will be used in both step-down and step-up

applications (for system interchange capability).

10.4.2.©Rating

10.4.2.1.The continuous rated power under steady state conditions shall be based on

the following temperature conditions (see clause 6.2, Table 1, IEC Publication 60076-

2/2011).

a. Average yearly temperature of the external cooling medium ………...25C.

b. Winding temperature rise as measured by resistance shall be equal to 60K for

OFAF and ONAF, for ODAF shall be equal to 65K

c. Top oil temperature rise as measured by thermometer………………...55K.

d. Maximum temperature of the cooling air ……………………………….45C.

e. Hot-Spot winding temperature rise ……………………..……………...73K.

The correction of relevant temperature rise limit are given in Table 2, IEC

Publication 60076-2/2011.

10.4.2.2.The three-phase auto-transformer shall have the following rating at the

temperature conditions indicated above.

Three phase

autotransformer

a. Continuous throughout rating with

full forced cooling ……......(MVA)

650

b. Continuous rating of tertiary winding

with full forced cooling.....(MVA)

not less than 150

The manufacturer shall indicate the continuous auto-transformer rating and the

continuous tertiary rating (see clause 5.6. ANN 'B2') under environmental conditions

(see subclause ‎10.1.1 ANNEXURE 'B1'). The cooling stages shall be as follows (see

subclauses ‎10.5.6.1).

- Stage 1: reduced forced cooling (the number of cooling units in operation shall be

manufacturer choice);

- Stage 2: partial forced cooling (all the cooling units in operation less two or

three);

- Stage 3: full forced cooling (all the cooling units in operation).



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10.4. Properties (cont.)

10.4.3.©Voltage Regulation

10.4.3.1. Voltage regulation provision shall be provided, including: On Load Tap

Changer.

10.4.3.2.The On Load Tap Changer shall be mounted on the common neutral.

10.4.3.3.The auto-transformer shall have rated MVA capacity at all taps.

10.4.3.4.The insulation level of the tap-changer must meet the requirements of

appropriate isolation of the auto-transformer winding (see clause ‎10.5.5)

10.4.4.©Rated Voltages and Winding Connection

The voltage ratings and winding connection of the three-phase auto-transformer (see

clause 5.4. ANN 'B2') shall be as follows:

Three phase auto-transformer

(line-to-line)

10.4.5.Auto-transformer connection group... YNyn0d

10.4.6.Highest voltage of the equipment (Um) …kV

a. High voltage winding terminals (HV).... 420

b. Low voltage winding terminals (LV).... 170

c. Neutral terminals (LV).... 52

d. Tertiary voltage winding terminals (TV).. 46

10.4.7.Rated winding voltage at principal tap

a. High voltage winding terminals (HV).... 400

b. Low voltage winding terminals (LV).... 170

c. Tertiary voltage winding terminals (TV).. Uterrated

10.4.8.Rated ratio at principal tap...(kV/kV/kV) 400/170/Uterrated

10.4.9.Rated ratio at maximum tap. (kV/kV/kV) 400/170+a%/Utermin

10.4.10. Rated ratio at minimum tap...(kV/kV/kV) 400/170-b%/Utermax

Remarks:

1. Uterrated -is the rated voltage of tertiary winding at principal tapping.

2. Utermax - is the maximum rated step voltage of the tertiary winding.

3. Utermin - is the minimum rated step voltage of the tertiary winding. 4. +a%; -b% - is the tapping range, where 170+a% shall be equal to 195.5 kV and

170-b% shall be equal to 153 kV

5. +a%; -b% - shall be manufacturer choice



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10.4.11.Guarantee

The term "guaranteed" used in this specification in connection with specified

quantities and in tests means that the quantity (magnitude) to which it is applied

shall be subjected to the tolerances given by IEC Publications as referenced in

clause ‎8.4, Annexure 'B1'.

10.4.12.©Impedance (see clause 5.8. ANN 'B2')

The guaranteed impedance at 75C measured between HV (400 kV) and LV

(170 kV) winding terminals shall be not less than 22.1% (based on 650 MVA) at all

the tapping positions. The highest impedance should be at maximum tap, and the

lowest impedance at minimum tap. The highest impedance shall not exceed

24.8%.

The allowable tolerance shall be 1/20 from the required value.

10.4.13.©Overloads

10.4.13.1.Each three-phase auto-transformer shall have overload capabilities in

accordance with IEC60076-7/2005 – Table 4, IEC60076-1/2011 (clause 5.1.4).

10.4.13.2.The maximum temperature limits shall be based on insulation system type

(clause 5.16.16, ANN. ‘B2’, IEC 60076-14/2009 clauses 5.1, 7.4 and Tables 3).

10.4.13.3.All associated components of the auto-transformer including bushings, tap-

changer and bushing current transformers shall have overload capabilities not lower

than the auto-transformer and the overload capabilities shall be in accordance with

IEC 60076-7/2005 (clause 5.2, 7.3.2), IEC 60076-1/2011 (clause 5.1.4, 5.8) .

The manufacturer shall provide a loading guide for the auto-transformer and

accessories.

10.4.13.4.For a preliminary calculation of the auto-transformer overload capability as

a function of daily load curve and ambient temperature, the manufacturer shall fill in

the required data at the clauses 5.27.5 to 5.27.11 ANNEXURE 'B2'. All the

preliminary data shall be based on design (see the specified temperature rise at

clause ‎10.4.2). The final data shall be based on “Temperature Rise test” results and

shall be included to the auto-transformer type test report (clause ‎11.3.1).


SR153AnnB2.xlsb#'clause5.13-5.19'!A102




SEPTEMBER 2017

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10.4.14.© Geomagnetically induced currents (GICs) capability

10.4.14.1.Geomagnetically induced currents (GIC) can cause saturation of the

magnetic circuit of transformers in a power system. This saturation can increase the

MVAR absorption of the transformers, leading to voltage-control problems,

generating significant harmonic currents, and cause heating of the internal

components of the transformer itself, leading to gas relay alarm/operation as well as

possible damage. Other effects of part-cycle core saturation are higher core sound

levels, tank vibrations, and load sound levels. These high tank vibrations may cause

loosening of terminal leads and may also impair accessories mounted on the tank.

10.4.14.2.The GIC capability of a power transformer constitutes both a GIC magnetic

capability and a GIC thermal capability, according to IEEE Std C57.163-2015.

10.4.14.3.The GIC magnetic capability of three-phase auto-transformer shall be based

on: Peak of magnetization current; Fundamental reactive power; Peak amplitude of

magnetizing current harmonics up to the eleventh harmonic. The values shall be

agreed between Manufacturer and Purchaser.

10.4.14.4.The GIC thermal capability of a transformer is mainly a function of the

magnitude and duration of the GIC waveform. The GIC capability of a transformer

design (see clause 5.27.4, ANN ‘B2’) is determined by the maximum allowed

temperatures for the windings and structural parts resulting from combinations of both

load current and GIC. These temperatures correspond to temperature limits

recommended by the industry loading standards for long and short duration of

emergency loading of transformer.

10.4.14.5.Recommended hot-spot temperature limits for GIC are as follows:

Component GIC type

Base GIC Short duration GIC events

IEC 60076-7/2005 IEC 60076-7/2005

Cellulose insulation 140 °C 160 °C

Structural parts 160 °C 180 °C

10.4.14.6. The GIC thermal capability test procedure shall be according to clause 6,

IEEE Std C57.163-2015 and subclause ‎11.3.7 of Ann. ‘B1’.

10.4.15.Voltage limitation

The applied voltage shall not exceed 1.05 times the rated voltage (principal tap) or the

tapping voltage (other tapping) (see IEC 60076-7/2005 clause 7.3.4).

10.4.16.Auto-Transformer Room

The Auto-Transformer shall be installed in ventilated indoor facilities.

The transformer room is 22 m long, 22 m wide, and 18 m high (see Appendix13).

The equipment room has natural ventilation (vents) and mechanical ventilation (fans).

The arrangement of vents for air inlet and air exhaust in the transformer room is: four

(4) air inlets (4.5 X 3.7 m) on room upper part and mechanical ventilation for air

exhaust (four fans) on upper part of opposite wall with the air inlet.



SEPTEMBER 2017

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10.5.Design and Construction

10.5.1.Dimensions and Weights

The required dimensions and weights of the three-phase auto-transformer shall be less

or equal than the following values (see clause 2.1, ANN 'B2'):

Overall dimensions and Weights Auto-transformer with oil-air

bushings on 400 kV terminals

a. Dimensions (m) with reduction sound walls Length Width Height

15* 8 9*

a. Dimensions (m) without reduction sound walls 13* 6 9*

b. Total Weight (t) 400

c. Max. Shipping Weight (t) 300

*The length and height values are for the auto-transformer completed mounted

(conservator, cooling system, bushings mounted) and include the sound reduction

means (sound enclosure or equivalent, clause ‎10.5.12.7).

The three-phase auto-transformer shall be designed to be interchangeable in

terms of electrical and physical parameters with the existing three-phase auto-

transformer (see clause ‎7.3)

10.5.2.The three-phase auto-transformer shall have graded (non-uniform) insulation

(clause 3.6, 5 of IEC 60076-3/2013) on the HV (400 kV) and LV (170 kV) sides. The

winding is designed with a lower insulation level assigned to neutral winding end.

Thermally upgraded paper shall be used for winding insulation (see subclause

‎10.5.10.7).

10.5.3.©Insulation level of windings, according to IEC 60076-3/2013 and IEC 60071-

1/2006 (see clause 5.17, ANN. ‘B2’):

10.5.3.1.B.I.L. - kV peak (1.2/50 s) (IEC 60076-3/2013, table 2, IEC 60071-1/2006,

table 2, 3):

a.400 kV line terminal -1425 kV peak

b.170 kV line terminal - 650 kV peak

c. neutral end terminal - 250 kV peak

d. TV winding terminal - Manufacturer's choice, shall be minimum 200

kV peak

10.5.3.2.Rated switching impulse withstand voltage: 400 kV line terminal -1050 kV

peak (IEC 60071-1/2006, table 3).

10.5.3.3.Power frequency withstand voltage kV (r.m.s) (IEC 60071-1/2006, table 2):

a. 170 kV line terminal -275 kV r.m.s.

b. neutral end terminal - 95 kV r.m.s.

c. TV winding - Manufacturer's choice, shall be minimum 70 kV r.m.s.




SEPTEMBER 2017

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10.5 Design and Construction (cont.)

10.5.3 Insulation level of windings (cont.)

10.5.3.4.Line terminal withstand voltage, kV (r.m.s) (see IEC 60076-3/2013, table 2):

a. 400 kV line terminal -570 kV r.m.s.

b. 170 kV line terminal -275 kV r.m.s.

10.5.4.©Insulation level of bushings (according to IEC 60137/2008, table 4):

10.5.4.1.B.I.L. - kV peak (1.2/50s):

a.400 kV bushing -1550 kV peak

b.170 kV bushing - 750 kV peak

c. neutral end bushing - 250 kV peak

d. TV bushing - 250 kV peak

10.5.4.2.Power frequency withstand kV (r.m.s):

a.400 kV bushing - 750 kV r.m.s.

b.170 kV bushing - 355 kV r.m.s.

c. neutral end bushing - 105 kV r.m.s.

d. TV bushing - Manufacturer's choice, shall be minimum 105 kV r.m.s.

10.5.4.3.Creepage:

The creepage distance of the bushings shall be not less than (see IEC 60815-3/2008):

a. HV (400 kV) line bushing (mm) ...... 11200

a. LV (170 kV) line bushing (mm) ...... 4750

b. neutral end bushing (mm) ...... 900

c. TV bushing (mm) - Manufacturer's choice, not less than neutral bushing.

10.5.5. Insulation level of OLTC shall be manufacturer’s choice.


SEPTEMBER 2017

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10.5.6.Cooling System (see clause 5.22, ANN 'B2'):

10.5.6.1.The cooling method shall be OFAF (Forced-oil and forced air), or ODAF

(Directed oil flow and forced air circulation), or ONAN/ONAF/OFAF (natural oil

circulation and forced air circulation) for indoor operation (see clause ‎10.1., ‎10.4.16)

10.5.6.2.The cooling system shall be divided in sections (or coolers). The coolers shall

be low-noise type (see clause ‎10.5.8) tank-mounted.

10.5.6.3. The coolers number (see clause 5.22.2, ANN 'B2') shall be

manufacturer's choice.

10.5.6.4.The cooling system shall consist of the necessary heat exchangers, fans and

pumps separately or in such combination as required complete with automatic control

equipment required to maintain the specified temperature rise in clause ‎10.4.2.

10.5.6.5.Pipe connections to the cooling sections shall be removable and the

cooling sections shall be replaceable without lowering the oil level in the tank.

10.5.6.6.All radiators and heat exchangers on auto-transformer shall be equipped

with bolted flanges and valves to permit removal of any radiator or heat exchanger

or pumps without draining the oil from the auto-transformer. Vent holes and drain

holes shall be provided in each radiator and heat exchanger.

10.5.7.Control Details of Cooling System

10.5.7.1.The cooling system shall operate at least in three cooling stages, based on the

auto-transformer hot-spot temperature (see clause 5.22.3, ANN 'B2'):

a. Stage 1: Reduced forced cooling. The number of cooling units in

operation shall be manufacturer choice and without exceeding the

permissible temperature-rise limits. The auto-transformer shall be operated

continuously at rated apparent power and 25C ambient air temperature, as

specified at 5.6.1 ANN 'B2'.

b. Stage 2: Partial forced cooling. All the cooling units in operation less

one or two or more, without exceeding the permissible temperature-rise

limits. The auto-transformer shall be operated continuously at rated apparent

power and 25C ambient air temperature, as specified at 5.6.2 ANN 'B2'.

c. Stage 3: Full forced cooling, with all the cooling sections in operation.

The auto-transformer shall be operated continuously at rated apparent power

and 25C ambient air temperature, as specified at 5.6.3 ANN 'B2'.







SEPTEMBER 2017

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10.5.7 Control Details and Cooling System (cont.)

10.5.7.2.The pumps and fans thermostatic control shall be initiated by winding hot-

spot temperature indicators or other temperature monitors.

10.5.7.3.The cooling control system shall incorporate means to initiate pumps and

fans immediately upon sudden increases of load and winding hot-spot temperature.

The winding hot-spot temperature values shall be agreed between purchaser and

transformer manufacturer.

10.5.7.4.The coolers shall be low noise oil-air and the sound power level shall be

manufacturer's choice based on auto-transformer sound power level (see

clause ‎10.5.8, ‎10.5.7.1).

10.5.7.5.All the electrical motors shall have individual thermal overload protection

and each of the cooling section groups shall have its overcurrent protection.

A trip of each protection element shall be locally and remotely alarmed.

Selectivity between downstream and upstream protections will be maintained.

10.5.7.6.The control scheme shall be designed by manufacturer (see clause ‎10.5.17).

The cooling system shall be supplied by two separate 400 Vac power sources working

separately. One source will be for stand-by duty only and will be activated by

automatic throw-over switch in case of loss of power of the main supply. In case of

loss of main or stand-by power supply there will be an alarm.

10.5.7.7. Single-phase supply sources 230 V a.c. for the control system and other

purposes shall be provided. For this purpose, one control transformer 400/230 V

shall be provided for each auto-transformer, fed from the dual three-phase power

supply source 400 Vac.


SEPTEMBER 2017

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10.5.7 Control Details and Cooling System(cont.)

10.5.7.8.A complete control system for the automatic operation of the three-stage

of cooling system shall be provided, including the automatic transfer from one

stage to another and alarm for exceeding the limit temperature conditions.

10.5.7.9.Control equipment shall include necessary circuit breakers, motor starters,

selector switches, temperature control relays, alarm actuating devices, auxiliary

relays and associate equipment required to provide a complete control system. The

interrupting rating of the breakers shall be not less than 15,000 A.

10.5.7.10.Oil flow supervision shall be provided for each oil-pump (See

accessories - oil flow gauge- see subclause ‎10.5.20.5.

10.5.7.11.A transfer switch for automatic or manual control of the cooling system

shall be provided.

10.5.7.12.The automatic and the manual control of the cooling equipment shall

include relays or auxiliary contacts for remote indication of the number of cooling

units in operation and remote alarm upon failure.

10.5.7.13.The cooling groups (number of coolers shall be manufacture’s choice) (see

clause 5.22.3, ANN 'B2') for reduced forced cooling stage shall start automatically,

by a voltage A.C. relay supplied by Purchaser when the auto-transformer is

energized and the other cooling groups shall start automatically as required by

increasing auto-transformer load and winding hot-spot temperature.

10.5.7.14.The control shall include the means for automatic cyclic changing of the

cooling group (fans and pumps) order i.e., so that every two weeks, the last group

shall become the first group, the first group shall become the second group and the

second group shall become the third group and so on, depend on the number of

installed cooling units (see clause 5.22.3, ANN 'B2'). The automatic cycle changing

system shall be supplied by others.




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10.5.7 Control Details and Cooling System (cont.)

10.5.7.15.Auxiliary relays shall be furnished for remote alarm upon failure of each of

the two 400 Vac power source supply and auto-transformer control power.

10.5.7.16.The relays which actuate the starting of the cooling group, due to

increasing auto-transformer temperature, shall be easily accessible for maintenance

and adjustment and shall be responsive to hot-spot temperature. By adjusting

these relays, it shall be possible to select over a reasonable range of the auto-

transformer temperature at which the cooling groups will start.

10.5.7.17.Each cooler will include aluminum tubes with extruded fins which prevent

galvanic action. These together with quality painting of external steel surfaces and

epoxy coated headers give protection against corrosion and ensure suitable heat

transmission.

10.5.7.18.All motors used shall have mechanical protection of the type IP65,

according to IEC 60034-5/2006.

10.5.7.19.The fans and pumps shall be equipped with all necessary starters, controls,

protective devices and relays for automatically starting and stopping the equipment

at predetermined temperatures, actuated by winding hot-spot temperature. The fans

and/or pumps shall be equipped also for manual control.

10.5.7.20.Pump Start-Up

The start-up of any pump or combination of pumps must not cause Buchholz relay

mal-operation.

10.5.7.21.Provision shall be made for the following remote indicating circuits:

- Position signal of the switch for automatic or manual control circuits.

- Normal operation signal for each stage of cooling.

- Alarm signal for power source failure.

- Alarm signal for control voltage source failure.

- Alarm signal for cooling section disconnected by protection.

- Alarm signal for motor disconnected by protection.

- Alarm signal for oil flow loss.

For each of those signals, two potential-free contacts shall be provided.

10.5.7.22.The Bidder shall include in the Proposal, the “Power and Control Voltage

Supply Diagram” and the ”Automatic Control Diagram” (see subclause ‎9.2.12) (see

clause 5.22., ANN 'B2').



SEPTEMBER 2017

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10.5.8.©Sound Level (Guaranteed value)

10.5.8.1.The guaranteed maximum sound power level of the three-phase auto-

transformer, under full load with all cooling sections in operation shall be up to 93

dBA at any tap-changer position.

10.5.8.2.The measurements and calculations of the sound power level will correspond

to the design of the auto-transformer (subclauses 10.5.12.7, 10.5.12.8) so they will

reflect the true sound power level of the transformer. The measurements shall be

according to IEC 60076-10/2016 and Appendix 10/Appendix 11. The sound power

level under full load shall be determined by the sum of the sound power levels at: "no-

load" excitation, "rated load current" and of the cooling sections at rated power

(according to IEC 60076-10/2016 clause 5 and 13).

a. auto-transformer with noise reduction walls (guaranteed values clauses 5.30.

Annexure ‘B2’)

1. If the transformer is provided with tank mounted panels with parts of the

tank not covered (for example the top of the tank), The method to estimate

the radiated sound power will be by performing two measurements of the

sound pressure method (or the sound intensity method) according to the

procedure described in IEC 60076-10 one with and one without panels

mounted. The measurement performed without panels represents the not

covered area whereas the measurement performed with mounted panels is

a representative for the covered area. The relevant physical area calculated

at the appropriate measuring distance is then taken to determine the partial

sound power; the total sound power level is derived by logarithmic

addition of the partial sound power levels.

2. This method will be performed on both "no load" and "rated current"

conditions.

3. If the "rated current" measurement will be performed with the cooling

sections in operation, the radiated sound power from the cooling sections

should be subtracted from the sound power of the "rated current" prior to

the determination of the partial sound power levels. The sound power from

the cooling sections should be added to the transformer's overall sound

power level at full load (according to IEC 60076-10/2016 clause 13).

4. This will be performed according to table 9 and table 10 of Appendix 10

and IEC 60076-10/2016.

b. auto-transformer without noise reduction walls (guaranteed values clauses

5.31. Annexure ‘B2’) shall be according to table 6, table 7 of Appendix 11 and

IEC 60076-10/2016, at a distance of 1 and 2 meters.




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10.5.8 Sound Level (Guaranteed value) (cont.)

10.5.8.3.The measurements and calculations will be according to IEC 60076-10/2016

unless the acoustic treatment would include any kind of sheet dampers, sound barrier

panels or any other acoustic measures that might influence in any way the normal

sound propagation of a transformer.

10.5.8.4.The manufacturer shall submit the required data at the clauses 5.30. or 5.31.

ANNEXURE ‘B2’ based on auto-transformer design (with or without noise

reduction walls).

10.5.8.5.The sound power level for three-phase auto-transformer with noise

reduction walls (subclause 10.5.8.3a) shall be stated in ANNEXURE ‘B2’ –

'Summary of Data', clause 5.30. The manufacturer should consider the associated

uncertainty according to clause 9, ISO3744/2010 and ISO4871/1996.

10.5.8.6.The sound power level for three-phase auto-transformer without noise

reduction walls (subclause 10.5.8.3b) shall be stated in ANNEXURE ‘B2’ –

'Summary of Data', clause 5.31. The manufacturer should consider the associated

uncertainty according to clause 9, ISO3744/2010 and ISO4871/1996.

10.5.9.©Earthing (see clause 5.16.17, ANN 'B2')

10.5.9.1. The common neutral terminal shall be solidly grounding.

10.5.9.2.The ground connection shall be executed by PVC 600V flexible insulated

cable 240 mm2 and brought out to the auto-transformer ground pad. The connection

shall be marked by nameplate located near the ground pad. On nameplate shall be

written “Neutral Ground”.

10.5.9.3.The core lamination parts separated by oil channels or insulated shall be

reconnected internally by insulated wire and brought out through one transition

bushing (clause 5.19, Annexure 'B2'). The bushings shall be located in the

weatherproof box on the tank cover. The box shall be IP55. All the bushings shall be

reconnected together externally by 16mm2 insulated copper wire. The common

connection wire shall be in insulated flexible metallic conduit and brought to the auto-

transformer ground pad. The upper end of the flexible metallic conduit shall be

grounded to the weatherproof box. The connection shall be marked by nameplate

located near the ground pad. On nameplate shall be written “Core Ground

Connection”.

10.5.9.4.The metallic part of the core frame such as beams, tie plates, braces etc. shall

be reconnected internally by insulated wire and brought out through one transition

bushing. The core grounding bushing shall be located in the same weatherproof box

on the tank cover (see subclause ‎10.5.12.6). The bushing should be grounded

externally by insulated copper wire 16 mm2. The wire shall be in insulated flexible

metallic conduit and brought to the auto-transformer ground pad. The upper end of the

flexible metallic conduit shall be grounded to the waterproof box. The connection

shall be designated by nameplate located near the ground pad. On nameplate shall be

written “Core Frame Ground Connection”.






SR153AnnB2.xlsb#clause5.19!f8


SEPTEMBER 2017

page B1- 40



10.5.9 Earthing (cont.)

10.5.9.5.All the metallic parts of the auto-transformer, which are energized, shall be

grounded. Two ground pads with 4 tapped holes M12 shall be provided on/near the

tank base on diagonally opposite sides.

10.5.9.6.The rated-short time withstand current of the ground pads for 1 sec. shall be

63 kA r.m.s. and the rated peak withstand current shall be 170.1 kA peak.

10.5.9.7. The gasket flange joints of bushings, OLTC, instruments and accessories

shall be electrically bridged to the cover of the tank by insolated cable and bolts with

welding nuts.

10.5.9.8.The gasket flange joint of the tank cover and main tank shall be electrically

bridged in minimum two opposite points of longer cover's diameter by earthing straps

and bolts with welding nuts.

10.5.10.Windings and Cores (clause 5.16, ANN. ‘B2’)

10.5.10.1.Windings shall be designed to obtain an optimal value for series and shunt

capacities so as to have a favorable distribution of the voltage for full waves,

chopped waves, and power frequency overvoltages.

The bidder shall state what measures have been taken to increase withstand against

these stresses.

10.5.10.2.The coils shall withstand to short circuits, overloads, and high voltage

stresses both mechanically and thermally without local overheating.

Leads from windings to terminal board to OLTC and bushings shall be rigidly

supported to prevent injury from vibration and short circuit forces.

10.5.10.3.The coil conductor shall be enameled copper wire, according to IEC

60317/2013. The enamel coating shall protect the copper wire from corrosion

phenomena if the mineral oil contains corrosive sulfur compounds.

10.5.10.4.The core shall be manufactured at high quality cold-rolled grain oriented,

low-loss, low magnetostriction for low noise level, non-aging sheet steel lamination,

according to ATSM A876/2009 and IEC 60404-8-7/2008. The insulation associated

with the core shall be designed so that no detrimental changes in physical or electrical

properties will occur during the life of the windings.



SEPTEMBER 2017

page B1- 41



10.5.10 Windings and Cores (cont.)

10.5.10.5.The core steel and windings shall be suitably braced to prevent

displacement or distortion during transportation and conditions of permissible

short circuit and overload.

10.5.10.6.The core shall be constructed so as to avoid any undue local

overheating, in all states of operation of the auto-transformer (rated load and overload

of the auto-transformer).

10.5.10.7.The winding insulation paper shall be thermally upgraded paper. The paper

shall comply with the general requirements given in IEC 60554-3-5/1984. The

method of test shall be according to IEC 60554-2/2001.(see clause 5.16.14, ANN.

‘B2’).

10.5.10.8.The thermal insulation class shall be chosen according to the winding hot-

spot temperature and metallic parts in contact with cellulosic insulation material (°C)

and shall be equal to 1200C (table 4, IEC 60076-7/2005). The winding insulation shall

have thermal class 120 (E) (table 1, IEC 60085/2007), (clause 5.2, IEC 60076-

14/2013), (clause 5.16.17, ANN. ‘B2’)

10.5.10.9.The pressboard and presspaper shall comply with the general requirements

given in IEC 60641-3-1/2008.

10.5.10.10.In order to protect the thermally upgraded paper (see above subclause

10.5.10.7), the paper wrapped copper wire, the gaskets, the water-based glues against

the corrosion damage caused by sulfur, those materials shall be corrosive sulfur free

(clause 5.16.15, ANN. ‘B2’).





SEPTEMBER 2017

page B1- 42



10.5.11.©Tertiary Winding

10.5.11.1.Mainly the tertiary winding shall be used for stabilizing purposes, but

depend on the impedance offered by manufacturer.

10.5.11.2.The insulation of the tertiary winding shall be suitable for the continuous

overload condition of the main windings (400 kV and 170 kV):

S*=1.3 x Sn = 1.3 x (650 x 0.85 + j650 x 0.53) = 718.25 MW + j447.85 MVar

in both step-up and step-down applications.

10.5.11.3.The dimensions of the tertiary winding shall be suitable to withstand

without damage the electro-dynamic forces and thermal stresses resulting from a

single-phase short-circuit in the primary or secondary of the auto-transformer.

10.5.11.4.The tertiary winding shall be designed to withstand without damage to

three-phase short-circuit on the tertiary terminals.

10.5.11.5. The delta connected tertiary winding shall have:

- U corner internal closed and external grounded

- V corner internal closed

- W corner external closed.

A Zinc Oxide Surge Arrester (see subclause 5.33.12, Ann. ‘B2’) shall be mounted on

each ungrounded corner. A bushing CT (see subclause ‎10.5.19.10 ) shall be located

outside the U corner (core 1), and two bushing CTs within the W corner (core 2, core

3).

During normal service conditions the delta tertiary winding shall be closed and it

shall be opened only during the measuring of the zero-sequence impedances (see

subclause ‎11.3.3 from 5 to 7). The tertiary shall be delta-connected with U corner

solidly grounded.

10.5.11.6.The tertiary ground connection shall be executed by two PVC 600V flexible

insulated cables 240 mm2 and brought out to the auto-transformer ground pad. The

connection shall be marked by nameplate located near the ground pad. On nameplate

shall be written “Tertiary Ground”.



SEPTEMBER 2017

page B1- 43



10.5.12.Auto-transformer Tank

10.5.12.1.The auto-transformer tank shall be welded steel construction, reinforced

in order to withstand the most severe conditions of operation, transport and vacuum

treatment.

10.5.12.2.The steel grade shall be according to EN 10025 grade S235 JR G2 or

equivalent.

10.5.12.3.Tank and their structural attachments shall be welded by the SMAW with

basic E70 covered electrodes conform to AWS A5.1, GTAW, SAW, FCAW with

E71T-5 electrode conform to AWS A5.20. Use of any other process shall be by

agreement between the manufacturer and the purchaser.

10.5.12.4.Welding shall be performed in a manner that ensures complete penetration

and complete fusion in the vertical and horizontal butt welds.

10.5.12.5.The auto-transformer shall be designed to be field welded to embedded

plates or beams. The manufacturer shall indicate, on the equipment outline drawing,

locations where field welding to the auto-transformer is preferred, load or stress limits

at these locations, and if applicable, locations where welding is not allowed

(according to IEEE Std. 693-2005, Annex D, subclause D.6.2).

10.5.12.6.Drawing of auto-transformer tank including the optical feedthroughs tank

wall plate, the junction box enclosure (see subclause ‎10.5.20.1.2) and external

earthing system, core grounding weatherproof box on the tank cover (see

subclause ‎10.5.9.4) shall be provided with the proposal.

10.5.12.7.The auto-transformer tank shall be provided with sound reduction means as:

steel sheet dampers, sound barrier sheet panels mounted on the tank walls, sound

barrier wall etc. The anti-noise means shall be manufacturer choice.

10.5.12.8.Preference shall be given to a proposal of an autotransformer without

sound barrier wall (subclause 5.29.2, Ann. ‘B2’).

10.5.12.9.The auto-transformer tank shall be absolutely water and hot-oil tight and

withstand full vacuum.

10.5.12.10.Separate compartments for auto-transformer and OLTC shall be

provided in auto-transformer tank.

10.5.12.11.The necessary gaskets shall be tight under all conditions especially

against the hot oils. Means shall be provided to prevent over compression of the

gaskets.



SEPTEMBER 2017

page B1- 44



10.5.12 Autotransformer tank (cont.)

10.5.12.12.A flanged valve set low enough to permit the removal of all residual oil

from the tank (2 inch minimum) shall be provided.

10.5.12.13.An angle valve (3/8 inch minimum) with brass plug for sampling oil from

the tank bottom shall be provided and shall include 1 inch oil sampling valve.

10.5.12.14.An angle valve (3/8 inch minimum) with brass plug for sampling oil from

the tank on the winding top level shall be provided. The location shall be

manufacturer choice.

10.5.12.15.All other necessary valves for vacuum and filling , draining and filtration

of oil shall be provided (see subclause ‎10.5.20.6 and 5.33.7. Ann. ‘B2’). All valves

must be supplied with padlocks.

10.5.12.16.Inspection of welds

10.5.12.16.1.Details of welding

10.5.12.16.2.Butt welds: Inspection for the quality of the welds shall be made using the

radiographic method and the visual method.

10.5.12.16.3.Fillet welds: Fillet welds shall be inspected by visual method.

10.5.12.17.Radiographic test:

10.5.12.17.1.Radiographic inspection is required for shell butt welds. For butt-welded

joints in which the thinner shell plate is less than or equal to 9.6 mm thick, one (1)

spot radiograph shall be taken in the first 2 meter of complete vertical joint of each

type and thickness welded by each welder or welding operator.

10.5.12.17.2.One (1) spot radiograph shall be taken in the first 2 meter of completed

horizontal butt joint.

10.5.12.17.3.In addition, all junction of vertical and horizontal joints shall be

radiographer.

10.5.12.17.4.Technique: The radiographic examination method shall be in accordance

with Section V, clause 2, of ASME Code.

10.5.12.17.5.Radiographic interpretation: All radiograms shall be delivered to

IEC/Materials Laboratory prior painting for interpretation and acceptance.

10.5.12.17.6.Welders qualification: The manufacturer shall conduct tests for all

welders assigned to manual and semiautomatic welding and all operators assigned to

automatic welding to demonstrate the welders and operators ability to make

acceptable welds.



SEPTEMBER 2017

page B1- 45




10.5.12.18.Cover

10.5.12.18.1.The tank cover shall be bolted. The tank cover shall be designed with sufficient

slope to properly shed water.

10.5.12.18.2. The cover shall be provided with provisions to make possible tying the

workers safety belts in order to ensure safe work on the cover. The a.m. provisions shall

permit free movement of the workers on the auto-transformer cover. The tender shall include

details for the safety provisions (see the below drawing).

2

4"

290

20

30

PLOT.pltPLOT FILE :

?USER REF :/DR1/RAIL/S2

Jul 2002Segev

Jul 2002text

Jul 2002text

Jul 2002Eran Levy

---- ---1

1

1:10

99

S1

BASE FOR SAFETY POLEWELDED ON TRANSFORMER

4. Sharp edges shall be removed.

thinner part partic ipating.

3. Welding according to std.. thickness of welding according to

2. After welding must be hot deep galvanized.

1. Steel is according to st-37

Remarks:

weld to 1,24each[ 8046mm (L= 200mm)3

weld to 1,3

weld to 2,3

each 1

1each

Steel PipeX4" sch.40

[ 250410mm (L= 250mm)

2

1

Notes(kg)Weight

Quan.UnitDescriptionITEM

1

3

2

10

290

20420

4"

8020

200

3

2

1

450

==

= =

250

250


SEPTEMBER 2017

page B1- 46




10.5.12.18 Cover (cont.)

10.5.12.18.3.The cover shall be painted with anti-slippage (anti-skid) paint (see Appendix 3).

10.5.12.18.4.The transformer tank shall be provided with two provisions for anchor ladders

to permit the workers safety to go up on the cover (see the below drawing).


SEPTEMBER 2017

page B1- 47




10.5.12.19.Pressure Relief Device

10.5.12.19.1.Each auto-transformer tank shall be fitted with a pressure-relief device

(see clause 5.33.2, ANN. 'B2') to protect against high pressures inside the oil tank.

The number of pressure relief device that will be installed in the auto-transformer tank

shall be manufacturer choice.

10.5.12.19.2.The manufacturer shall submit the method for determining the number of

pressure relief device.

10.5.12.20. Gas collecting pipes

The connection between the gas collecting pipes and the collection points (turrets,

cover etc.), on the upper side of the cover shall be metal to metal flanged connections.

The flanges shall be rotating type.

10.5.12.21.Control of Stray Flux

10.5.12.21.1.Means shall be used to control local losses and heating produced by stray

flux under all working conditions in auto-transformer active parts.

10.5.12.21.2.Those means will reduce to a minimum the additional losses caused by

leakage flux in the tank, cover, etc. under all working conditions.

10.5.12.21.3.Effectiveness of the Control Stray Flux System shall be check by turns,

which will be mounted on magnetic shunts during type test temperature rise of auto-

transformer (see clause ‎11.3.1).

10.5.12.22. Manholes

10.5.12.22.1.The construction of the tank shall enable easy installation or removal

of bushings, bushing current transformers, and other accessories without disturbing

the leads, untanking the auto-transformer or removing the cover. If necessary in this

respect, one or more manholes shall be provided in auto-transformer cover.

10.5.12.22.2.A manhole shall be provided in the auto-transformer tank to allow

access to the OLTC selector switch without untanking the core and coils.

10.5.12.22.3.The shape of manholes shall be circular with 600 mm clear opening.



SEPTEMBER 2017

page B1- 48




10.5.12.23. Conservators

10.5.12.23.1. The conservator tank shall be provided of sufficient size to

accommodate the change in oil volume that will occur between the specified ambient

temperature limits in service (see clause ‎10.1.1) with the auto-transformer operating at

full load or overload.

10.5.12.23.2.The oil conservator shall be provided with a synthetic membrane (see

subclause 5.28.8 Ann. ‘B2’)or an inert gas filled elastic cushion as a barrier between

top oil and air. The membrane should be at least 98% non-permeable to air, and

proved by manufacturer specification.

10.5.12.23.3.For oil conservator provided with a synthetic membrane, for protection

of the space above the diaphragm, a silica gel air drier shall be mounted at 1.5m

approximately above ground level (see subclause ‎10.5.13.5 and 5.28.9 Ann. ‘B2’).

10.5.12.23.4.The conservator shall be provided with all necessary, drain valves, plugs

for oil filling, connection to tank, etc.

10.5.12.23.5.Separate compartment in main conservator or separate conservator shall

be provided for OLTC.

10.5.12.23.6.Each section of conservator tank shall have a suitable oil level gauge

(see subclause 10.5.20.4 ) mounted on the conservator tank so as to be easily read from

the ground level.

10.5.12.23.7.The OLTC conservator is used to maintain oil level in compartments

which contain contacts used for making and breaking current, it shall be separate

from the main auto-transformer conservator.

10.5.12.23.8.The tap changer container shall be provided with a separate oil

compartment, it shall be in connection with the conservator through a protective gas

relay (see clause 5.33.10, ANN. 'B2').

10.5.12.23.9.If the bushing center tube is oil-filled by transformer oil, then the oil

level in the transformer conservator must be above the oil level at the top end of the

bushing center tube.

10.5.12.24.Vacuum and Pressure Requirements

The main tank and oil containing parts which form part of the oil circuit used to

process the core and winding assembly shall be designed to permit the process to be

undertaken at full vacuum (see clause 5.29, Ann. ‘B2’).

The assembled auto-transformer, including tank, coolers, oil pumps, all oil

connections, valves, pressure relief devices and other fittings shall be capable of

withstanding, without permanent visible distortion:

- when oil filled, internal pressure 70 kPa.

- without oil, full internal vacuum.





SEPTEMBER 2017

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10.5.13.Oil and Oil Preservation System

10.5.13.1.The auto-transformer oil shall meet the requirements indicated in

"MINERAL INSULATING OIL SUPPLIED FOR/WITHIN NEW ELECTRICAL

EQUIPMENT" number 51/2016 (see Appendix no.1).

10.5.13.2.Technical data and oil test report shall be supplied. (see Appendix no.1)

10.5.13.3. The auto-transformer oil shall be approved by Purchaser before delivery

(see Appendix A of Appendix no.1).

10.5.13.4.Oil preservation system shall be provided for protecting the oil against

atmospheric moisture and oxygen.

10.5.13.5.The silica gel shall be according to enclosed technical Specification no.

804/2012 (see Appendix no. 2 and clause 5.28.9 , Ann. ‘B2’).

10.5.13.6.The materials in contact with auto-transformer oil shall not contain any

substance, that may, to any extent, influence its dielectric properties or result in

chemical reactions with the oil, or in any way lead to deterioration of oil quality.

10.5.13.7.The details of the oil preservation system shall be completely described in

the proposal (see clause 5.28, Ann. ‘B2’).

10.5.14.Losses, Tolerances, and Warranties

Losses, Tolerances, and Warranties shall be according to Annexure 'D' (see clause

5.11, Ann ‘B2’))





SEPTEMBER 2017

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10.5.15.Tap Changer for Operation under Load

10.5.15.1.The OLTC , including the motor-drive mechanism, shall be mounted on

each three-phase auto-transformer and shall be designed, constructed and testing

according to IEC Publications 60214-1/2014, 60214-2/2004 and 60076-1/2011.

10.5.15.2.Auto-transformer Manufacturer shall be responsible for the proper testing,

assembling, mounting and proper operation of the OLTC and motor-drive mechanism.

10.5.15.3.The auto-transformer manufacturer shall be responsible for selecting

an appropriate current rating and insulation levels of the OLTC (see clause ‎10.4.3),

including the rating and insulation level of the connecting leads between the OLTC

and the winding of the auto-transformer (see clause 5.21, Ann. ‘B2’). The current

rating and insulation level of the OLTC shall be indicated in the proposal.

10.5.15.4.The OLTC rated through-current shall be selected according to the IEC

Publication 60214-2/2004 clause 6.2.2 The OLTC must withstand and switch the

maximum permissible overload currents to which the auto-transformer is subjected,

according to the IEC Publications 60076-7/2005, clause 7.3.2 .

10.5.15.5.The OLTC shall withstand without damage the maximum short-circuit

stresses which would be imposed upon it when the auto-transformer is subjected to

short-circuits currents.

10.5.15.6.The contact-life under normal current conditions shall be guaranteed

and indicated in the tender documents.

10.5.15.7.Test reports for the OLTC and motor-drive mechanism shall be submitted

by auto-transformer manufacturer (type and routine test) with the proposal.



SEPTEMBER 2017

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10.5.15 Tap Changer for Operation under Load (cont.)

10.5.15.8.On Load Tap Changer Equipment

Control equipment for OLTC shall be provided. The equipment shall be complete

with all necessary devices for:

- Manual operation;

- Electrical operation from the motor drive cubicle;

- Electrical operation by remote control;

10.5.15.8.1.The equipment shall include, but not be limited to, the following items:

- External mechanical position indicator;

- Operation counter;

- Hand crank interlocked with a safety switch;

- 'Local-Remote' selector switch in the motor drive cubicle;

- 'Raise-and-Lower' push-buttons in the motor drive cubicle;

- A tap position indicator shall be supplied and installed locally at the motor

drive cubical.

- Two sets of potential free dry contacts for remote tap position indicator.

- The OLTC shall be provided with all the necessary facilities for operation with the

voltage control equipment described in clause ‎10.5.16.

- Mechanically-operated electric limit switches and mechanical stops shall be

provided on the tap-changer drive mechanism to prevent overtravel beyond

the maximum raise and lower positions;

- A hand wheel or hand crank for manual operation of the tap-changer driving

mechanism shall be provided. The necessary interlocking between manual

and electrical operation shall be provided. A suitable place for storing hand wheel

or hand crank, if detachable, shall be provided.


SEPTEMBER 2017

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10.5.15.9.Tap Changer Control

10.5.15.9.1. Tap Changer Remote Control

The tap changer remote control system will include the following four remote control

options: Station - Manual and Automat; TELE - Manual and Automat.

The selection between the STATION and TELE modes shall be done by the SCADA

system (see subclause ‎4.2.7).

a. Station (from the SCADA System)

1. Manual

In this position the raise and lower commands are executed, from the switching

station's SCADA system, via ETHERNET TCP/IP LAN in IEC-61850 protocol to the

Voltage Control Equipment (V.C.E).

2. Automat

The raise and lower commands are given from the Voltage Control Equipment

(V.C.E) only.

This position will be used when automatic control without remote manual control is

required i.e. substation is attended, tests, etc.

b. TELE (from the dispatch center)

Automat + Manual Control In this position, the tap changer is remotely controlled. There are two possible

situations:

Automat: the tap changers are automatically controlled by the V.C.E.

Manual: The tap changers are manually controlled from the dispatch

center.

The selection between the two possibilities is done by the dispatch center.

10.5.15.9.2.Manual-Local

The "Local-Remote" selector switch in the motor drive cubicle is set to "Local"

position, "Lower-Raise" commands will be given from the "Lower-Raise" push

buttons located in the motor drive cubicle.


SEPTEMBER 2017

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10.5.15.10.Tap Changer Indications

10.5.15.10.1.Tap changer position shall be indicated:

At motor drive cubicle.

At switching station's SCADA (by serial link to the V.C.E).

On V.C.E. rack .

At dispatch center (B.C.D. from potential free contacts).

10.5.15.10.2.“Tap changer in operation” indication shall be indicated at the V.C.E. and the

switching station's SCADA system.

10.5.15.10.3.Desired value of the regulated voltage shall be controlled and indicated, in

B.C.D. code, at dispatch center.

10.5.15.11.The tap changing equipment shall satisfy at least the following

requirements:

- Only one tap movement per operation of the control switch;

- A tap change, once commenced, shall be completed independent of failure

of the control scheme operation or auxiliary supply;

- The current making and breaking contacts shall be contained in such a

separate tank that their operation shall not deteriorate the auto-transformer

oil;

- If a short circuit arises during tap changing, the tap-changer drive shall be

locked by a relay device;

- If the short circuit occurs during winding-up of the energy storage system

by the motor driver, the latter must be blocked, and tap changing should

not take place;

- All necessary drain and oil sample valves, shall be fitted;

- The tap-changer shall enable the initiation of signals in the two extreme

positions, as well as in the medium position. For this purpose three

separate contacts shall be provided, in addition to those used in case of

parallel operation.


SEPTEMBER 2017

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10.5.16.Voltage control

10.5.16.1.The voltage control and parallel operation schemes and their complete

design shall be made by the Contractor. The schematic diagrams of the voltage

control and parallel operation shall be included with the offer (see clause 5.21.19,

Ann. ‘B2’).

10.5.16.2.One voltage regulator will be supplied for the control (automatic and

manual) of each auto-transformer.

10.5.16.3.The voltage regulator system shall include the hardware and software which

is necessary to communicate with the switching station's SCADA system over the

station's ETHERNET TCP/IP LAN in IEC-61850 protocol. (see clause ‎4.2.7).

10.5.16.4.The voltage regulator shall include the following features: “Personal Logic

Editor” functions to program simple logical links via the web-based visualization;

GOOSE (generic object oriented system events) function to send GOOSE messages

via the IEC 61850 control system protocol; importing CID (Configured IED

Description) and SCD (Substation Configuration Description) file (see clause

5.21.19l, Ann. ‘B2’).

10.5.16.5.The “End User License Agreement” and “Software/Firmware Maintenance

Agreement” shall be submitted with proposal and shall be included in the contract.

10.5.16.6.The hardware and software (implemented and on-line) shall fulfill the

requirements as described in Appendix 8.

10.5.16.7.The device as hardware, software, firmware, communication protocol shall

meet the “CYBER REQUIREMENTS” as stated in Appendix 12.

10.5.16.8.Supervision Circuits and Alarms for Tap Changer Control

10.5.16.8.1.Time supervision circuit of the operation mechanism: Each operating mechanism

shall be supervised by a time delay relay, if the operation time is greater than a preset value,

the tap changer shall be blocked and an alarm signal shall be sent to the switching station's

SCADA system and to the dispatch center.

10.5.16.8.2.Operating mechanism shall have the possibility of being manually stopped and

blocked in emergency situations from the control building.

10.5.16.8.3.The regulated voltage shall be supervised by a voltage limit supervisory. An

alarm signal shall be sent to the switching station's SCADA system and to the dispatch center

when the preset values are exceeded.

10.5.16.8.4.The power supply, the OLTC, and the internal circuits of the V.C.E. shall be

continuously monitored.




SEPTEMBER 2017

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10.5.16 Voltage Control (cont.)

10.5.16.8.5.An alarm shall be sent to the switching station's SCADA system and to the

dispatch center when failure will be detected.

10.5.16.9.Parallel Operation Control

10.5.16.9.1.The parallel operation control circuit shall provide the means for the tap changer

operation, either manual or automat, when two or three or four auto-transformers are

connected in parallel.

The operating modes of four auto-transformers connected in parallel shall be as follows:

Where : M - Master

F - Follower

I - Individual

The operating conditions of up to four auto-transformers connected in parallel are as

follows:

a. Parallel operation of the auto-transformers:

The first auto-transformer shall be selected as “MASTER”.

The remaining two or three auto-transformers shall be selected as

“FOLLOWER”.

Individual operation

Parallel operation


SEPTEMBER 2017

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10.5.16.9 Parallel Operation Control (cont.)

b. Parallel operation of any three auto-transformers, and individual

operation of the fourth auto-transformer.

The first auto-transformer shall be selected as “MASTER” and the

others as "FOLLOWER".

The fourth auto-transformer will be selected for "INDIVIDUAL”

operation.

"INDIVIDUAL” operation of each auto-transformer shall be blocked

when any connection with other auto-transformer on the LV side (170

kV) (through bus-bar isolators and/or coupler-switches) exists.

c. Individual operation of four auto-transformers.

"INDIVIDUAL” operation of each auto-transformer shall be blocked

when any connection with other auto-transformer on the LV side (170

kV) (through line isolators and/or coupler-switches) exists.

The logic that checks the connection between the auto-transformers will

be part of the V.C.E.

10.5.16.9.2.The control of each tap changer of the auto-transformers working in parallel

(manual or automat) shall be performed from the controls, of the “MASTER” auto-

transformer. The controls of the “FOLLOWER” auto-transformers shall be deactivated.

10.5.16.10. Supervision Circuits and Alarms for Parallel Operation Control

10.5.16.10.1.Synchronous operation of all the auto-transformers operating in parallel shall be

supervised by V.C.E.

In case of discrepancy between tap changer positions of the auto-transformers

working in parallel, and after a preset time delay, the tap-changers shall be blocked

and an alarm signal shall be given to the switching station's SCADA system and to the

dispatch center.

10.5.16.10.2.In case of wrong combination of the “MASTER-FOLLOWER-INDIVIDUAL”

signals (i.e. two or more “MASTER” signals, three “FOLLOWER” signals, etc.) an alarm

signal shall be given to the SCADA system and to the dispatch center.

10.5.16.10.3.In case of communication failure of one or more VR, either in the “MASTER",

"FOLLOWER" or "INDIVIDUAL" mode, an alarm signal shall be given to the SCADA

system and to the dispatch center.


SEPTEMBER 2017

page B1- 57




10.5.16.11.All local and remote control equipment for voltage control shall be

supplied by the contractor. The equipment shall comprise, in general, but not be

limited to, the following:

a. The voltage control equipment shall be suitable for control of up to four auto-

transformers operating in parallel.

b. The voltage control equipment shall provide the means to cover up to four

auto-transformers in parallel, without any additions or modifications.

c. Each auto-transformer shall be able to operate either individually or in

parallel with one or two or three of the other auto-transformers. The first auto-

transformer shall be selected as “MASTER”.

d. All the necessary means provided for automatically maintaining a

predetermined voltage within adjustable limits at the lower voltage busbars to

which the auto-transformer are connected, shall be subject to the approval by

Purchaser.

e. When operating in parallel with other auto-transformers, an adequate

interlocking device shall be provided for synchronous operation of the tap-

changers. A contact closure output for out-of-step alarm shall be provided.


SEPTEMBER 2017

page B1- 58




10.5.16.12.Digital equipment for automatic operation of the tap-changer shall be

furnished. Potential for the voltage regulator, will be obtained from an external

potential transformer.

10.5.16.13.Power supply for the motor drive will be 400 Vac. Power for heaters and

lights will be 220 V single phase, 50 Hz. Molded case circuit breakers shall be

provided for power heater and light supply circuits. Power circuit breaker shall

have an interrupting rating of not less than 15,000 A symmetrical.

10.5.16.14.It must be possible to perform a manual tap changing in the event of the

voltage regulator being removed. The related tap position indication must still be

available.

10.5.16.15.The voltage control set shall include three voltage regulators and the

means which will be necessary for parallel control. One voltage regulator for each

three-phase auto-transformer (see clause ‎4.1.1‎2).

10.5.16.16.Power supply for the instrument (V.C.E) will be 60 Vd.c.

10.5.16.17.Tests

The voltage regulator system shall be tested at Manufacturer’s works and on site.

A Guide line for the tests shall be provided by the Manufacturer and approved by the

Purchaser. The Guide line shall include, but not limited to, the following tests:

- Functional tests (factory acceptance test) based on the voltage control system

requirements as described in Appendix '8' and on the manufacturer recommendations.

The implemented software and on-line software shall be tested according to Appendix

'8' , Appendix 12. The final program tests shall be submitted by Manufacturer and

approved by Purchaser. The FAT shall be witnessed by the Purchaser.

- The software and communication protocol documentation shall be submitted with

proposal and shall be included in the contract

- The “On Site Functional Tests” (commissioning test) of the voltage control system

shall be based on clauses ‎10.5.15.9 , ‎10.5.16.8, ‎10.5.16.9, ‎10.5.16.10 and Appendix

'8'. The tests shall be performed on the V.C.E.


SEPTEMBER 2017

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10.5.17. Control Cabinets and Wiring (see clause 5.34, Ann. ‘B2’):

10.5.17.1.The cabinet shall be provided with environmental protection of the type

IP55 according to IEC 60529/2001, IEC 61439-2/2011.

10.5.17.2.All small wiring for control or accessory equipment shall be according to

enclosed EPD-A.03/2004 (see Appendix no.6) unless otherwise required in this

Specification.

10.5.17.3.The coating application shall be according to enclosed Standard 217-

000260-2015 (see Appendix no.4).

10.5.17.4.The verification of temperature rise shall be based on clause 10.10 of IEC

61439-1/2011.

10.5.17.5.The degree protection test shall be according to clause 10.3 of IEC 61439-

1/2011.

10.5.17.6.The Electromagnetic compatibility (EMC) shall be according to clause

10.12 of IEC 61439-1/2011.

10.5.17.7.Electromagnetics minimum shielding performance of the enclosure shall be

according to IEC 61000-5-7, clause 5, table 1, and shall be at least: EM4677xx.

10.5.17.8.A separately protected 230 V a.c. heater with thermostat and separately

protected internal lightning shall be provided for the cabinets.

10.5.17.9.The Purchaser can furnish the following power supply voltages:

a. Heating purposes - 230 V a.c. single phase (50 Hz);

b. Motor - 400 V a.c. three phase (50 Hz);

c. Control circuits - 60 V d.c ; 220 V.d.c.;

d. Alarm circuits - 60 V d.c.

10.5.17.10.All small wiring for control or accessory equipment shall be installed in

standard galvanized rigid steel conduits, or electrical metallic tubing or ducts, with

water tight joints.

10.5.17.11.External wiring shall be with flexible conductors with a preferred cross

section not less than 2.5 mm2.

10.5.17.12.All small wiring enclosures shall be grounded.

10.5.17.13.All control and instrument wiring, alarm leads and instrument transformer

secondary for connection to Purchaser's cables shall be terminated at terminal blocks.

10.5.17.14.The blocks shall be spaced to allow 1½" (inch) clearance on all sides.

Free space shall be provided for wiring and crossing Purchaser's incoming leads.

10.5.17.15.The size of Purchaser's incoming conduits will be 2 inches in

diameter.

10.5.17.16.Ten (10) percent free terminals shall be left at Purchaser's disposal in each

terminal block.

10.5.17.17.The assembled control equipment and wiring connections shall be

subjected to a one minute test of 2500 V, a.c. at the factory after fabrication and

assembly are complete.



SEPTEMBER 2017

page B1- 60



10.5.18.©Bushings

10.5.18.1.The bushings (see clause 5.19, ANN. 'B2') shall be designed and tested

according to IEC Publication 60137/2008, IEC 60815-3/2008 suitable for the

service conditions stated in subclause ‎10.1.1.

10.5.18.2. The bushings shall be polymer insulators and shall meet the following

requirements (see subclause: ‎10.5.4):

400 kV

line

terminal

170 kV

line

terminal

tertiary winding

terminal

common

neutral

terminal

10.5.18.3.Type Oil-air Oil-air Oil-air Oil-air

10.5.18.4.Number...............

3 3 4 1

10.5.18.5.Rated voltage

(kV).........

420 170 same to common

neutral

not less

than 46

10.5.18.6.Lightning

impulse withstand voltage

(kV peak).........................

1550

750

same to common

neutral

not less

than

250

10.5.18.7.One minute

power frequency test

(kV r.m.s) ...............

750

355

not less than

common neutral

not less

than 95

10.5.18.8.Creepage not

less than (mm) ...................

11600

4750

not less than

common neutral

not less

than 900

10.5.18.9.The bushings shall have temperature limits according to IEC Publication

60137/2008 clause 4.8.

10.5.18.10. The bushing rated current shall be selected according to the IEC

Publication 60137/2008 clause 4.2. The bushings shall withstand without damage to

the transformer overload conditions as stated in IEC 60076-7/2005, clause 7.3.2.

SR153AnnB2.xlsb#clause5.19!A8


SEPTEMBER 2017

page B1- 61



10.5.18 Bushings (cont.)

10.5.18.11.The bushing creepage shall be according to IEC 60815-3/2008.

10.5.18.12.Insulator's Pollution levels shall be according to Desert and Coastal types

of environments, as defined by IEC 60815-1/2008. The insulator shall have site

pollution severity (SPS) class d (heavy) as defined in and IEC 60815-3/2008, clause 6.

10.5.18.13.The bushing inner terminal shall be connected directly to the transformer

lead either by brazing or crimping.

10.5.18.14.The tests of the bushings shall comprise but not be limited to: - All type and routine tests indicated in clause 7 and 8 of the IEC Publication

60137/2008.

- Cantilever load test - Bidder shall indicate in the proposal the procedure for the

cantilever load test.

- Bushing seismic capability shall be according to subclause ‎11.3.2o7

10.5.18.15.The HV (400 kV), the LV (170 kV) and the TV oil-air bushings shall

be provided with test (capacitance) tap for dielectric dissipation factor (tanδ) and

capacitance measurements. They shall be tested for dielectric dissipation factor at

the factory and test values shall be included in test reports. Space on the bushing

nameplates shall be provided for stamping values of initial field power factor

tests.

10.5.18.16.The oil filled bushings shall be provided with oil level indicators.

10.5.18.17.The bushings shall have thermal insulation class 120 (E) according to IEC

Publication 60085/2007.

10.5.18.18.Purchaser explicitly requires that Manufacturer shall indicate in the

questionnaire (clause 5.19, Annexure 'B2') the type and the name of manufacturer for

each bushing (400 kV, 170 kV, tertiary and neutral).

10.5.18.19.General drawings giving main dimensions for each bushing (400 kV, 170

kV, tertiary and neutral) shall be submitted for approval, and shall be attached to the

proposal (see subclause ‎9.2.11).

10.5.18.20.The HV (400 kV), LV (170 kV), TV and neutral bushing terminals shall be

copper.

SR153AnnB2.xlsb#clause5.19!A8


SEPTEMBER 2017

page B1- 62



10.5.19.©Bushing Current Transformers

10.5.19.1.The bushing current transformers (see clause 5.20, ANN. 'B2') shall be

designed, constructed and tested according to IEC Publication 61869-1/2007 and

61869-2/2012.

10.5.19.2.The bushing current transformers shall be designed for a maximum

ambient temperature in cooling medium of 115C and a maximum 24 hours average

of 105C (insulation thermal class 105 (A) according to IEC Publication 60085/2007).

10.5.19.3.The current transformers shall be constructed to withstand the same

primary thermal and dynamic short circuit currents as the auto-transformer.

10.5.19.4.The protective current transformers shall be designed, constructed and

tested according to IEC Publication 61869-2/2012.

10.5.19.5.The rating plate shall carry the marking as defined at IEC 61869-2/2012,

clause 6.13.201 and IEC 61869-1/2007, clause 6.13.

10.5.19.6.Each core shall be provided with an individual secondary winding which

shall be electrically completely separated from other windings.

10.5.19.7. The secondary windings (for each current transformer) shall be wired to

barrier type terminals accommodated in a terminal box (IP55) mounted on the bottom

of the bushings. Wiring shall be provided between the a.m. terminal boxes to

terminals in the auto-transformer control cubical.



SEPTEMBER 2017

page B1- 63



10.5.19 ©Bushing Current Transformers (cont.)

10.5.19.8.400 kV phase bushing current transformer (2 cores) Core

No. Type Rated

ratio

(A/A)

Rated

burden

(VA)

Accuracy

class Rct

(2)

() Ek

(3)

(V)

Rated

extended

primary current

(%)

Thermal

capability

of

secondary

current

(%)

Accuracy

limit

factor

Purpose

1 protective 2600/1 20 PX(1)

(5P20) 2

for

1 A

400 - 120 20 Restricted

earth fault

protection

2 measuring 1200/5 Manufa

cture's

choice

Manufac

ture's

choice

- - 120 - - Thermal

Image ‎10.5

.20.1.1

3 measuring IGIC(4)/1 Manufa

cture's

choice

Manufac

ture's

choice

- - 150 - - GIC

monitoring

system ‎10.

5.20.11

10.5.19.9.170 kV phase bushing current transformer (3 cores)

Core

No. Type Rated

ratio

(A/A)

Rated

burden

(VA)

Accuracy

class Rct

(2)

() Ek

(3)

(V)

Rated

extended

primary current

(%)

Thermal

capability

of

secondary

current

(%)

Accuracy

limit

factor

Purpose


(5P20) 2

for

1 A


earth fault

protection


cture's

choice

Manufa

cture's

choice

- - 120 - - Line

Drop

Compens

ation


cture's

choice

Manufa

cture's

choice

- - 120 - - Thermal

Image ‎10.

5.20.1.1

(1)

Low leakage flux current transformer. No limit for remnant flux. (2)

Rct - secondary winding d.c. resistance in ohms, corrected to 750C (IEC 61896-

2/2012, clause 3.4.202). (3)

Ek- Rated Knee point e.m.f. The values of the knee point voltage and of the knee

point e.m.f.are deemed as equal, due to the minor influence of the voltage drop across

the secondary winding resistance (IEC 61896-2/2012, clause 3.4.216). (4)IGIC – manufacturer choice


SEPTEMBER 2017

page B1- 64



10.5.19 ©Bushing Current Transformers (cont.)

10.5.19.10.Tertiary voltage phase bushing current transformer (3 cores) Core

No. Type Rated

ratio

(A/A)

Rated

burden

(VA)

Accuracy

class Rct

(2)

() Ek

(3)

(V)

Rated

extended primary

current

(%)

Thermal

capability

of

secondary

current

(%)

Accuracy

limit

factor

Purpose

1 protective 2500/1 20 PX(1) (5P20)

2

for

1 A

400 - 120 20 Over current

Differential

Protection

2 protective 1700/1 20 5P20 - - - 120 20 Protection

3 measuring IGIC(4)/1 Manufa

cture's

choice

Manufa

cture's

choice

- - 150 - - GIC

monitoring

system ‎10.

5.20.11

10.5.19.11. Neutral bushing current transformer (3 cores)

Core

No. Type Rated

ratio

(A/A)

Rated

burden

(VA)

Accuracy

class Rct

(2)

() Ek

(3)

(V)

Rated

extended

primary current

(%)

Thermal

capability

of

secondary

current

(%)

Accuracy

limit

factor

Purpose


(5P20) 2

for

1 A


earth fault

protection

2 protective 1700/1 20 5P20 - - - 120 20 Zero

sequence

o/c backup

protection

3 protective 1700/1 20 5P20 - - - 120 20 Differential

Protection (1)

Low leakage flux current transformer. No limit for remnant flux. (2)

Rct - secondary winding d.c. resistance in ohms, corrected to 750C (IEC 61896-

2/2012, clause 3.4.202). (3)

Ek- Rated Knee point e.m.f. The values of the knee point voltage and of the knee

point e.m.f. are deemed as equal, due to the minor influence of the voltage drop across

the secondary winding resistance (IEC 61896-2/2012, clause 3.4.216). (4)IGIC – manufacturer choice

10.5.19.12.The rated extended primary current shall be expressed as a percentage of

the rated primary current (see clause 5.6.201.5, IEC 61896-2012).

10.5.19.13.Test certificates for bushing current transformers:

For each current transformer, type and routine test certificates shall be sent to the

Purchaser as soon as possible after the tests, including magnetization curve.

10.5.19.14.The bushing current transformers shall have overload capabilities not

lower than the auto-transformer and in accordance with clause 7.3.2 of IEC 60076-

7/2005 and clause 5.1.4 of IEC 60076-1/2011.


SEPTEMBER 2017

page B1- 65



10.5.20.Accessories

The following additional accessories shall be furnished:

10.5.20.1. Thermal Image:

The thermal image system shall include:

a. Local winding temperature indicator.

b. Winding temperature monitor

10.5.20.1.1.Local Winding Temperature Indicator. It reproduces indirectly the

temperature hottest part of the auto-transformer winding (see clause 5.33.4.1, ANN.

'B2').

The Manufacturer shall provide two (2) local winding temperature indicator for

reproducing indirectly the hot-spot temperature of the 400 kV (HV) and 170 kV

(LV) winding. It shall be connected to bushing CT's (see

subclasses ‎10.5.19.8, ‎10.5.19.9). Each of them shall be equipped with four (4)

separate sets of adjustable contacts for coolers control, alarm and trip.

The main components of the local winding temperature indicator are:

a. Winding temperature transmitter. It shall include a temperature sensor

and a heater resistor which is supplied by a current transformer . It has the

function to simulate the winding temperature and shall be located in an oil

filled pocked in the transformer tank cover.

b. Pointer temperature thermometer. It is a display device of the winding

temperature and shall be provided with micro switches for coolers control,

alarm and trip. The thermometer is fixed to the transformer with a base plate.

The Manufacturer shall provide his recommendation for the following:

-Detailed description including calculation regarding calibration of the

winding temperature monitor based on temperature rise test and cooling

system stages (reduced, partial and full forced cooling stage, see

subclauses ‎10.5.6.1 and 5.6. ANN 'B2')

-Alarm and trip values.



SEPTEMBER 2017

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10.5.20 Accessories (cont.)

10.5.20.1 Thermal Image: (cont.)

10.5.20.1.2.Direct Winding Optical Temperature Monitor

-The direct winding temperature monitor system (see clause 5.33.4.3, ANN. 'B2') is

for remotely controlled temperature purpose. It shall give a representation of the

winding/oil temperature in the control room and shall be a multi-channel fiber optic

monitor.

-The temperature monitor shall incorporate HTTP, TCP/IP protocol and RS-485

serial port using MODBUS/RTU protocol.

- The device as hardware, software , firmware and communication protocol shall meet

the “CYBER REQUIREMENTS” as stated in Appendix 12.

- The software documentation including communication protocol shall be submitted

with proposal and shall be included to instruction book.

- The “End User License Agreement” and “Software/Firmware Maintenance


- The FAT of the device will be attached to each auto-transformer test report

- The fiber optic multichannel temperature monitoring system shall include:

a. The fiber optic temperature monitoring system shall be supplied by the

Contractor. The system shall comprise, in general, but not limited to, the

following:

-Two (2) fiber optic temperature probes (one active and one idle) for

each measurement points and will be installed directly to the oil and

to the metallic parts, like: core, HV, LV, TV winding.

- The minimum recommended number of sensors shall be

according to Annexure E, table E.1, IEC 60076-2/2011.

- The locations of the probes shall be agreed between the purchaser and

the manufacturer and shall be based on the manufacturer calculation

and transformer design (see clause 5.33.4.3, ANN. 'B2')

- The fiber optic probe shall be rugged probe.

- The system shall include the following accessories: fiber-optic

temperature probe, optical feedthrough connectors, fiber-optic

extension cable, opto-electronic transmitter, tank wall plate (TWP) and

protective junction box enclosure.

- The TWP shall be direct bolting, with gasket onto the tank wall

(not on the cover). The TWP location shall be agreed between the

purchaser and manufacturer (tank wall).

- The device shall be mounted in auto-transformer control cubical and

shall successfully withstand in operation the climatic and

environmental conditions as defined under clause ‎10.1

- Programmable alarm set points.

b. The analog outputs will be 4÷20 mA

c. The measuring range will be 0C 200C.

d. Power supply for the winding temperature monitor will be 220 Va.c./d.c.



SEPTEMBER 2017

page B1- 67




10.5.20.1 Thermal Image: (cont.)

10.5.20.1.3. Panel Mount Remote Digital Indicator

The instrument shall be high accuracy digital indicator (see clause 5.33.4.2, ANN.

'B2') for the control of temperature, multi inputs and multi ranges. It shall be a panel

mount type and IP66 .

The instrument shall comprise, in general, but not limited to, the following:

a. The analog outputs will be 4÷20 mA.

c. The measuring range will be 0C 200C.

d. Power supply will be 220 Va.c./d.c.

10.5.20.2. Hot Oil Thermometer

For measuring the temperature of hot oil (see clause 5.33.3., ANN. 'B2'), each auto-

transformer shall be provided with a dial thermometer including contacts for alarm,

tripping and control.

a. The indicating instrument shall be weatherproof and the casing must be

on tank at eye-level.

b. A maximum pointer shall be provided which may be reset at any time by

means of push button.

A remote indication of the oil temperature shall be possible. This will include a

resistance detector (100 ohms platinum) on each auto-transformer tank.

Two or more additional pockets for the insertion of thermometers to check oil

temperature shall be provided on the cover of the auto-transformer, for temperature

calibration and measurement.

The Manufacturer shall provide his recommendation for the following:

-Alarm and trip temperature for hot oil thermometer.




SEPTEMBER 2017

page B1- 68




10.5.20.3.On-Line Dissolved Gas Analysis

10.5.20.3.1.The On-Line Dissolved Gas Analysis monitor (see clause 5.33.9., ANN. 'B2')

shall measure at least 7 gases (Hydrogen; Methane, Ethylene, Ethane, Acetylene, CO, CO2)

and Relative Moisture as RT%. The device should not have any cross contamination from

those gases and from other gases that can appear in oil. Stainless steel tubing is used to

connect the device to the transformer.

10.5.20.3.2.The pump inside the measuring device should be robust and have at least 15

years on guarantee.

10.5.20.3.3.The oil flow thorough the monitor should be protected against bubble

formation.

10.5.20.3.4.The On-Line Dissolved Gas Analysis monitor shall incorporate HTTP,

TCP/IP protocol and RS-485 serial port using MODBUS/RTU protocol.

10.5.20.3.5.The FAT of the monitor device with gas commercial gas in oil standard will be

attached to each auto-transformer test report.

10.5.20.3.6.The device as hardware, software, firmware, and communication protocol shall

meet the “CYBER REQUIREMENTS” as stated on stated on Appendix 12.

10.5.20.3.7.The software and communication protocol documentation shall be

submitted with proposal and shall be included in the instruction book.

10.5.20.3.8.The “End User License Agreement” and “Software/Firmware Maintenance


10.5.20.3.9.The device should be capable to be calibrated on site without be demoted

from transformer. The calibration should be performed or by external standard gas

mixture or by oil standards.

10.5.20.3.10.The software shall display graphically the gas levels, alarm and alert

conditions, and gas level history. It shall be capable of direct modem connection to

the instrument to download all data to a remote computer.

10.5.20.3.11.Power supply of the instrument will be 220Va.c.

10.5.20.4.Oil Level Gauge

A magnetic oil gauge with dial (see clause 5.33.1., ANN. 'B2' and ‎10.5.12.23.6),

legible from the ground, shall be mounted on one end of the expansion tank. Dial

markings shall show normal, minimum, maximum and 50C oil levels.

The gauge shall contain two sets of alarm contacts (for 220 V d.c.) one set of low-

level contacts and one set of contacts to close when the oil reaches a dangerously

low level.




SEPTEMBER 2017

page B1- 69




10.5.20.5.Oil Flow Gauge

An oil flow gauge (see clause 5.33.6., ANN. 'B2') with 220 V d.c. alarm contacts to

signal loss of oil flow shall be provided for each oil circulating pump (see


10.5.20.6. Oil Valves (see subclause ‎10.5.12.12)

The following oil valves (see clause 5.33.7., ANN. 'B2') shall be provided:

- Oil drain valve, with bottom connection;

- Two upper filter valve;

- Oil sampling connection valve;

Each of the oil valves shall be mounted on a different height.

10.5.20.7.Buchholz Relay

A suitable Buchholz relay (see clause 5.33.5., ANN. 'B2') shall be provided and

mounted on the connection pipe between the highest point of the tank and oil

conservator (as applicable). The necessary valves shall be provided

Two flanged full bore ball valve (see subclause 5.33.5.9., ANN. 'B2') shall be

mounted one on each side of the Buchholz relay (main tank and conservator). The

system shall be modular to facilitate easy repair or replacement or maintenance of the

modules.

A shutter valve (see subclause 5.33.5.10., Ann. ‘B2’) shall be mounted between the

ball valve located on conservator side and the Buchholz relay. The shutter valve shall

avoid the oil comes out from conservator following to an important oil loss which

may happen due to a serious accident (for instance a break in the bushing insulator

caused by an atmospheric discharge, a break in the transformer tank caused by an

accidental hit, etc.)

10.5.20.8.Protective relay for OLTC

The protective relay is designed to protect the on-load tap-changer and the

transformer during a malfunction within the on-load tap-changer or the selector switch

oil compartment (see subclause ‎10.5.12.23.8, clause 5.33.10. Ann. ‘B2’).

It trips when the specified oil flow speed between the on-load tap-changer head and

the oil conservator is exceeded.

The protective relay must be connected so that the transformer is immediately isolated

from the power when the protective relay is tripped.







SEPTEMBER 2017

page B1- 70




10.5.20.9.UHF partial discharge Fixed Internal Couplers

These PD measurements are performed using a broadband antenna (UHF Fixed

Internal Couplers). The UHF partial discharge sensor shall measure the transformer

partial discharge signal by detecting the transient electromagnetic waves.

The sensors shall be supplied by the Contractor (see clause 5.33.11., ANN. 'B2').

The types of sensors are as follows:

- UHF plate sensors, mounted within the top cover, the side walls, the OLTC

compartment. The sensor numbers shall be between 4 and up to 7 (three on top cover,

one on OLTC compartment, three on side walls). They shall be fitted into dielectric

windows.

- UHF Oil Valve sensors (optional).

The Fixed Internal Couplers numbers and position shall be agreed between the

manufacturer and the purchaser. The FAT of the sensors will be attached to each auto-

transformer test report.

10.5.20.10. On-Line Partial Discharge Monitoring System (clause 5.33.8., ANN.

'B2').

On line partial discharge (PD) measurements provide information on the dielectric

integrity of the High Voltage insulation of oil insulated power transformers. The PD

measurements shall detect and alarm the developing of dielectric faults before

insulation failure can occur.

The system shall continuously monitor the changes in the bushing insulation, for a set

of three bushings in a group, based on bushings capacitance and bushing power factor.

It shall contain: microprocessor-controlled monitoring device, dual sensors for

periodic PD measurements.

The sensors shall be installed on all 400 kV and 170 kV bushings test (capacitance)

tap (clause 10.5.18.15).

The device as hardware, software, firmware, and communication protocol shall meet

the “CYBER REQUIREMENTS” as stated in Appendix 12.

The On-Line Partial Discharge Monitoring System documentation included software,

communication protocol and calibration procedure shall be submitted with proposal,

and included in the instruction book.

The “End User License Agreement” and “Software/Firmware Maintenance

Agreement” shall be submitted with proposal and shall be included to the contract.

The FAT of the device will be attached to each auto-transformer test report.




SEPTEMBER 2017

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10.5.20.11.On-Line GIC Monitoring System (see clause ‎10.4.14.1 ,clause 5.33.13.

ANN. 'B2')

The Geomagnetic Induced Current (GIC) monitoring system shall measure the DC

current through the transformer’s neutral connection. This could be done by

measuring the voltage across a suitable shunt or through the use of non-invasive DC

current sensor such as Hall Effect current sensor (clause 5.33.14. ANN. 'B2') to

measure the quasi-direct current flow in the neutral conductor.

The second part is to measure the phase currents on two bushing CT’s for the purpose

of determining up to 8th harmonics content for the purpose of detecting core

saturation.

The instrument simultaneously measures DC current in the neutral by using split core

Hall Effect transducer and the AC harmonics on any of two bushing CT’s (HV

winding ‎10.5.19.8 and TV winding ‎10.5.19.10) using split core CT.

The GIC monitor shall incorporate: HTTP, TCP/IP protocol and RS-485 serial port

using MODBUS/RTU protocol, analog outputs will be 4÷20 mA.

The device as hardware , software, firmware, communication protocol shall meet the

“CYBER REQUIREMENTS” as stated on stated in Appendix 12

The On-Line GIC Monitoring System documentation, communication protocol,

calibration procedure shall be submitted with proposal, and included in instruction

book.



The FAT of the instrument will be attached to each auto-transformer test report.




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10.5.20.12.Impact Recorder System (clause 5.33.15., ANN. 'B2').

Impact Recorder, shall be a wireless data logger with inbuilt sensors that is affixed

directly on to equipment to record potential events that could damage the transformer.

It shall be equipped with GPS to record the geographical position in the event of an

incident once the measurement channels for the alarm limits are exceeded or based on

time intervals.

Transfer data to PC with wired or wireless communication or Bluetooth via the data

logger.

The device as hardware, software, firmware, communication protocol shall meet the

“CYBER REQUIREMENTS” as stated on stated on Appendix 12.



The FAT of the instrument will be attached to first delivered auto-transformer test

report.

10.5.20.13.Moisture in Oil Instrument (clause 5.33.16., ANN. 'B2').

The instrument shall provide the measurement of moisture in terms of water activity

(Aw) or relative saturation (%RS), in transformer oil. The Moisture level in oil is thus a

true indicator of moisture present in the paper insulation.

It shall incorporate: RS-485 serial port using MODBUS/RTU protocol, analog outputs

4÷20 mA.

The measurement shall be done by probe, which includes a capacitive thin film sensor.

The number and location of probes shall be agreed between manufacturer and purchaser.

The device as hardware, software, firmware, communication protocol shall meet the

“CYBER REQUIREMENTS” as stated on stated in Appendix 12



The FAT of the instrument will be attached to each auto-transformer test report.

10.6.Commissioning

The commissioning instruction shall be provided as part of the Instruction Book (see

clause 9.4.2). The Site Acceptance Test for Auto-Transformer is according to clause

‎11.4 .




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10.7.Operation and Maintenance

10.7.1.General

10.7.1.1.The manufacturer shall provide a detailed oil-filled transformer diagnostic

maintenance plan, including the schedule for periodic retesting and inspections

(clause ‎9.2.5).

10.7.1.2. The transformer maintenance procedure shall be a combination of proactive

diagnostics and reactive maintenance (clause ‎9.4.5).

10.7.1.3.The proactive diagnostic maintenance plan will contain two elements:

a. Recommended diagnostic criteria (genetic signatures) to be used to monitor

the operational integrity. The "genetic signature" values shall be based on the

type and routine three-phase auto-transformer test results.

b. Schedule for periodic retesting or monitoring of the chosen diagnostic criteria

(genetic signatures).

10.7.1.4.The reactive maintenance plan shall be based on planned or unplanned

outage on combination with on-line diagnostic tests, and shall be purchaser choice.

10.7.2.Spare and Renewal Parts

10.7.2.1.Contractor shall provide with the proposal a complete list of spare and

renewal parts, including the name of the respective manufacturers, manufacturer's

designation, type, corresponding standard and separate prices for each item.

Purchaser reserves the right to purchase parts directly from the manufacturer or

another subsupplier. This list shall also include availability of the part and time to

delivery (included transport up to Israel). Contractor shall indicate which parts

are recommended for stock by the Purchaser, and emphasize which are the

critical spare parts (see subclauses ‎4.5).

10.7.2.2.Contractor shall provide all spare and renewal parts necessary for initial

start-up and testing. These parts shall be listed in the proposal (see

clause ‎9.2.50).

10.7.2.3.Contractor undertakes that spare and renewal parts shall be available for be

the useful life of the equipment supplied under this contract.

10.7.2.4.Each bushing of the type resin-impregnated paper (RIP) shall be shipped with

oil filling hermetically cylinder on bottom part of the bushing (see clause 10.5.18).


SEPTEMBER 2017

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11.Test and Inspections

11.1. Standards and Testing Specifications

Factory acceptance tests shall be performed according to IEC Publications 60076,

unless otherwise specified.

11.2.Measurement Accuracy

All measuring equipment shall conform to the relevant specified standards or better.

The measuring equipment shall be calibrated at intervals that assure that their

properties match to the measuring requirements and at least once a year. The

calibration must include, but not limited to, all points and/or intervals called for by

this specification and those required by the tests. The calibration values must be

within calibration limits including the uncertainty. The calibration laboratory must be

accredited to ISO/IEC 17025 by an accreditation body which has a valid agreement

with ILAC MRA – (International Laboratory Accreditation Cooperation Mutual

Recognition Arrangement) and its schedule of accreditation should cover the type and

range of the measuring equipment to be calibrated including the BMC.

All measuring equipment shall bare visible tags which demonstrate its serviceability.

The proper calibration certificates shall also be available at the test location for

review, before commencing any test.

11.3.©Tests

The auto-transformer shall be subjected to the following type, routine and special

tests at the Manufacturer's works. The tests shall be carried out in the presence of

Purchaser representatives and all expenses shall be an integral part of the quotation. If

the test methods are not prescribed in IEC 60076 or other standards, they shall be

subject to agreement before the contract, between manufacturer and purchaser.


SEPTEMBER 2017

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11. Test and Inspections (cont.)

11.3 Tests (cont.)

11.3.1.Type Tests

The type tests shall be performed on the first three-phase auto-transformer only and

shall include, but not be limited to, the following tests:

a. Temperature rise test:

- The temperature rise test shall be performed according to IEC Publication

60076-2/2011.

- The temperature rise test shall be performed at tap position where the value of

the total losses (load losses + no load losses) is maximum and shall be performed

in three ways, as follows:

1. At reduced forced cooling stage at maximum losses suitable to the power

indicated by the manufacturer for this operation mode (see clause 5.6.1., Ann. 'B2').

2. At partial forced cooling stage at maximum losses suitable to the power indicated

by the manufacturer for this operation mode, (see clause 5.6.2., Ann. 'B2').

3. At full forced cooling stage, with all the cooling units in operation and maximum

losses suitable to the power indicated by the manufacturer for this operation mode

(see clause 5.6.3., Ann. 'B2').

- The temperature rise test shall be made also for tertiary winding.

- For direct measurement of auto-transformer hotspot temperature in

addition to the fiber optic probes (see subclause ‎10.5.20.1.2), the

manufacturer will install thermocouples directly to the metallic parts, like:

windings, core, etc. windings, core, etc. The locations of the thermocouples

shall be agreed between the purchaser and manufacturer, and shall be based

on the manufacturer calculation.

b. Gas-in-oil analysis by pre-approved laboratories only (see table B, Appendix 1):

- Before and after the temperature rise tests a gas-in-oil analysis shall be performed,

according to clause 7.12 , IEC 60076-2/2011, Annex. D “Dissolved gases analysis for

the detection of local overheating”, IEC 61181/2007, Appendix 1.

c. Measurement of the radio influence voltage:

The measurement of radio influence voltage shall be made in accordance with the

NEMA Publication no.107.

d. Check the effectiveness of the Control Stray Flux System by the induced voltage on

turns, which will be mounted on magnetic shunts during the type test.

e. External Infrared Thermography of the tank.

The Infrared Thermography Method shall check the effectiveness of the cooling

system during temperature rise test.





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11. 3 Tests (cont.)

11.3. 1 Type Tests (cont.)

f. Measurement of sound pressure/ intensity and power levels for auto-transformer

(Guaranteed – see clauses 5.30., 5.31. Annexure ‘B2’)

The measurements and calculations of the sound power level will be suitable to the

design of the auto-transformer (subclause 10.5.12.7, 10.5.12.8):

f1. The measurement of sound pressure/ intensity level and calculating sound power

level for auto-transformer with noise reduction walls (subclause ‎10.5.8.2a,) shall be

performed according to the IEC 60076-10/2016 and table 9 of Appendix 10. The test

shall be made at no-load and rated current sound level.

f2. The measurement of sound pressure/ intensity level and calculating sound power

level for auto-transformer without noise reduction walls (subclause ‎10.5.8.2b) shall

be performed according to the IEC 60076-10/2016 and table 6 of Appendix 11. The

test shall be made at no-load and rated current sound level.

Based on the above values (see f1 and f2 tests), the manufacturer shall calculate the

spatially averaged sound pressure level and the sound power level. The calculation

shall be based on the method described at clause 11.2., 12, 13 of IEC 60076-10/2016.

The manufacturer shall provide a 1/3 - octave band frequency spectrum distribution of

the first auto-transformer sound pressure level (see Appendix 10 or Appendix 11).

A detailed calculation of the sound power level for the auto-transformer shall be

included to the proposal. A calculation of the sound power level shall be made for the

auto-transformer at no-load and for the auto-transformer at rated current.

The sound power level for the auto-transformer in operation at rated voltage and rated

current, load sound level, shall be determined by summing the no-load sound power

level and the rated current power level according to the IEC 60076-10/2016, clause

13.

g. Measurement of the dielectric dissipation factor (tan.) and the capacitance in

the emptied three-phase auto-transformer (after tests completion and auto-transformer

draining for delivery purpose). The measurement shall be performed only on the first

auto-transformer without oil and with bushings, in the same conditions as in

subclause ‎11.3.5.6, in order to detect the location of future faults (oil or active parts).

The measurements shall be according with IEEE Std. C57.12.90-2015, table 4,

method II at 3 kV for subclauses ‎11.3.5.6.2.a. to ‎11.3.5.6.2.e. and 0.5 kV for

subclauses ‎11.3.5.6.2.f. to ‎11.3.5.6.2.h.

h. Measurement of the power taken by the fan and oil pump motors (see

clause ‎10.5.7.1 , see clauses 5.11.4. Annexure ‘B2’).

The measurement of the power taken by the fan and oil pump motors shall be

performed simultaneously during measurement of sound pressure levels .





SEPTEMBER 2017

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11.3 Tests (cont.)

11.3.2.Routine Tests (IEC 60076-1/2011, clause 11.1.2):

The tests shall be performed on each three-phase auto-transformer and shall include

but not be limited to* the following tests :

a. Core insulation test:

Core insulation resistance shall be measured after complete assembly of the three

phase autotransformer at level of at least 1 kV DC. The measurement duration should

be 1 minute. The minimum resistance value shall be 500 MΩ. The temperature of the

three-phase autotransformer under test shall be noted.

b. Measurement of winding resistance:

Measurement of winding resistance shall be made before the no-load loss test.

The measurement shall include resistance measurement of high voltage, low voltage

and tertiary winding. The resistance measurement shall include all taps. The

temperature at which the measurement is executed shall be recorded.

c. Measurement of the voltage ratio (Guaranteed) and check of voltage vector

relationship:

The voltage ratio shall be measured on each tapping. The polarity and vector group

symbol of the auto-transformer shall be checked.

* Manufacturer shall supply a full list of all other tests performed during production

with corresponding results.


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11.3 Tests (cont.)

11.3.2 Routine Tests (cont.)

d. Measurement of short-circuit impedance (according to clause 11.4. IEC 60076-

1/2011) (Guaranteed – see clauses 5.8. Annexure ‘B2’)*

The test shall be performed at the relevant rated current (tapping current) and 50 Hz

on the principal tapping, and on the highest and lowest value of the tapping. The

current shall not be less than 50 % thereof.

The measurement of impedance voltage shall include:

-Measurement between HV and LV winding.

-Measurement between HV and TV winding.

-Measurement between LV and TV winding.

The other windings being open-circuited.

The manufacturer shall provide an auto-transformer impedance equivalent circuit

including the impedance values. The circuit shall be based on the windings

arrangement and shall contain the self and mutual impedance of the windings, of the

windings to core and of the windings to tank. The impedances shall be computed for

the principal tapping, the highest and lowest value of the tapping. The circuit diagram

shall be attached only to the first auto-transformer test report.

e. Measurement of load losses (Guaranteed – see clauses 5.11.3. Annexure ‘B2’)*

The test shall be performed at rated current and normal frequency on the principal

tapping, and on the highest and lowest value on the tapping.

The load losses shall be measured between windings taken in pairs as indicated

above in subclause d.

f. Induced overvoltage tests with internal partial discharge measurements- see

section ‎11.3.5, subclause ‎11.3.5.5.4.

*The ambient temperature shall be noted.




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11.3 Tests (cont.)


g. Measurement of no-load loss and no-load current (Guaranteed – see clauses 5.11.1.

Annexure ‘B2’)

The no-load loss and the no-loss current shall be measured at rated frequency and at a

voltage equal to 110%, 105%, 100%, 90% and 10% of the rated voltage (see clause

11.5, IEC 60076-1/2011).

g.1. Magnetization Characteristic of the magnetic core alone, given under the form

listed below:

u = f(io) and ф = f(io) up to 110% Unom.

Curves of the magnetic core (without hysteresis) shall be provided by manufacturer

within test report of the first delivered auto-transformer . The curves shall be based

on the test values for the voltages up to 110% of nominal and on calculated values

for nominal voltage till saturation zone (indicate the air core reactance value)..

Unom= nominal voltage;

io = instantaneous value of the magnetizing current;

= instantaneous value flux;

u = instantaneous value of the voltage;

g.2. No-load losses characteristic of the magnetic core alone

Po = f(U) up to 110% Unom .

The curves shall be based on the test values for the voltages up to 110% of nominal

and on calculated values for nominal voltage till saturation zone (indicate the

equivalent resistance value of the no-load losses in the saturation zone).

Po - no-load losses.

U - voltage value.

No-load losses characteristic of the magnetic core alone, shall be provided by

manufacturer with the test report of the first delivered auto-transformer.

h. Measurement of the harmonics of the no-load current

The harmonics of the no-load current shall be measured and the magnitude of the

harmonics is expressed as a percentage of the fundamental component. The test shall

be performed at rated voltage on the principal tapping, and on the highest and lowest

value of the tapping.



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11.3 Tests (cont.)


i. Oil leak test

The tank and oil-filled compartments shall be tested for oil tightness. The test shall

be performed according to Manufacturer's standards. The Manufacturer shall

indicate in the proposal the method for the tank leakage test.

j. Test on on-load tap-changers

After the tap-changer is fully assembled on the auto-transformer, the auto-

transformer manufacturer shall perform on the OLTC the tests indicated in

clause 11.7 of IEC Publication 60076-1/2011.

k. Dielectric tests:

See section ‎11.3.5 'Insulation Levels and Dielectric Tests'.

l. Tightness test:

The tank shall be tested for gas tightness before delivery. The test shall be

performed according to Manufacturer's standards and clause 11.8, IEC 60076-1/2011.

The Manufacturer shall indicate in the proposal the method for the tank tightness

test.

m. Insulation oil test

Insulation oil test shall be performed according to IEC-60296/2012 and clause 8 of

"MINERAL INSULATING OIL SUPPLIED FOR/WITHIN NEW ELECTRICAL

EQUIPMENT" number 51/2016, table B, Appendix 1.


SEPTEMBER 2017

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11.3 Tests (cont.)


n. SFRA Fingerprint Test

The Sweep Frequency Response Analysis test (SFRA) shall be according to IEEE Std

C57.149-2012. The SFRA test shall be performed in order to obtain baseline reference

results for each auto-transformer, so as to assist in detection of core movement and

winding deformation/displacement during transportation (see subclause ‎11.4.1). The

SFRA test shall be performed by the manufacturer prior the transportation of the auto-

transformer.

All windings should be tested as shown below in the test connection table:

Wye-Wye

Delta

Test1 Test2 Test3 Test4 Test5 Test6

H1-X1 H2-X2 H3-X3 X1-H0X0 X2-H0X0 X3-H0X0

*Test7 *Test8 *Test9 **Test10 **Test11 **Test12

H1-H0X0 H2-H0X0 H3-H0X0 H1-H0X0 H2-H0X0 H3-H0X0

**Test13 **Test14 **Test15 Test16 Test17 Test18

X1-H0X0 X2-H0X0 X3-H0X0 Y1-Y3 Y2-Y1 Y3-Y2

* Indicates short circuit tests: X1, X2, and X3 are shorted together. The neutral is not

included when shorting the common winding.

** Indicates short circuit tests: Y1, Y2, and Y3 are shorted together.

The SFRA test shall be performed by the purchaser after the transportation of the

auto-transformer.

Where: H1,H2,H3 – high voltage (400 kV) winding terminals

X1,X2,X3 – low voltage (170 kV) winding terminals

Y1,Y2,Y3 – tertiary winding terminals

H0X0 – common neutral terminal

o. Equipment qualification to prove seismic withstand (see subclause ‎10.1.3)

o1. The auto-transformer shall be tested or analyzed to prove the seismic design. The

transformer shall be qualified according to IEEE Std 693/2005.

o2.The auto-transformer shall be qualified taking into account the in service

configuration.

o3.Required seismic qualification level shall be "moderate level".


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11.3 Tests (cont.)


o. Equipment qualification to prove seismic withstand (cont.)

o4. The auto-transformer seismic qualification level is defined according to IEEE Std

693/2005 clause 8.3.2 and fig. A.2.

o5. The auto-transformer shall be tested or analyzing for the Required Spectrum

according to IEEE Std 693/2005 clause 8.3.2 and fig. A.2.

o6. Required qualification method for different kind of equipment shall be according

to IEEE Std 693/2005 Annexures C,E,F,K,L.

o7. Seismic withstand capability for:

1. three-phase auto-transformer except for the polymer bushings and surge arresters

shall be demonstrated by "Static analysis" according to D.4.1 (IEEE Std 693/2005).

2. The appendages for the transformer such as: radiators, conservators, control

cabinets, shall be demonstrated by static analysis according to A.1.3.1, the

acceleration level shall be multiplied by 3.

3. The surge arrestors shall be qualified according to app. K. The input acceleration

levels shall be multiplied by 2.

3. polymer material insulators (bushings) from 161 kV and above shall be

demonstrated by "Time history shake-table test" according to D.4.4 (IEEE Std

693/2005).

Polymer bushing 35 kV to less than 161 kV by static pull test according to D.4.5

(IEEE Std 693/2005).

After performing the test or analysis, the manufacturer is requested to submit for

approval the following documents:

a. Seismic analysis qualification report according to IEEE Std 693/2005 Annex. S.

b. Seismic test qualification report according to IEEE Std 693/2005 Annex. T.

p. Measurement of the power taken by the fan and oil pump motors (where

applicable).

The measurement of the power taken by the fan and oil pump motors shall be

performed simultaneously during measurement of sound pressure levels .


SEPTEMBER 2017

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11.3 Tests (cont.)


q. Performance test (where applicable).

Mechanical test shall be made on fans, pumps, oil level gauge, etc. for proper

functioning.

r. Measurement of sound pressure/ intensity and power levels

The measurements and calculations of the sound power level will be suitable to the

design of the auto-transformer (subclause 10.5.12.7, 10.5.12.8):

r1. The measurement of sound pressure/ intensity level and calculating sound power

level for auto-transformer with noise reduction walls shall be performed according to

the IEC 60076-10/2016 and table 10 of Appendix 10.

r2. The measurement of sound pressure/ intensity level and calculating sound power

level for auto-transformer without noise reduction walls shall be performed

according to the IEC 60076-10/2016 and table 7 of Appendix 11.

s. PD detection using UHF technique

The test shall be performed at voltages up to 115% of normal operating levels and the

power frequency shall be varied between 50 Hz and 60 Hz.

The test procedure shall be agreed between the manufacturer and the purchaser (see


t. Check of the ratio and polarity of bushing current transformers, clause 11.1.2.1 of

IEC 60076-1/2011.


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11.3 Tests (cont.)

11.3.3.Special Tests:

a. Measurement of zero-sequence impedance

The measurement of zero-sequence impedance (see clause 5.9., Ann. ‘B2’) shall be

performed on the first auto-transformer according to the IEC 60076-1/2011, clause

11.6. The measurements are carried out with a current not exceeding the difference

between the rated currents on the low-voltage side and the high-voltage side. The

zero-sequence test shall be made on the winding with the available neutral (star-

connected winding). The test shall be performed on the principal tapping, and on the

highest and lowest value of the tapping.

The measurements shall be made as follows:

1. A single-phase voltage shall be applied between the three connected HV terminals

and neutral. The LV terminals shall be open-circuited. The tertiary winding shall be

closed (see subclause ‎10.5.11.5).

2. A single-phase voltage shall be applied between the three connected HV terminals

and neutral. The LV terminals shall be short-circuited. The tertiary winding shall be

closed.

3. A single-phase voltage shall be applied between the three connected LV terminals

and neutral. The HV terminals shall be open-circuited. The tertiary winding shall be

closed.

V

V

Low voltage

Tertiary

Neutral

High voltage

V

V

Low voltage

Tertiary

Neutral

High voltage

Low voltage

Neutral Tertiary

High voltage

V

V



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11.3 Tests (cont.)

11. 3.3 Special Tests (cont.)

a. Measurement of zero-sequence impedance (cont.)

4*. A single-phase voltage shall be applied between the three connected LV terminals

and neutral. The HV terminals shall be short-circuited. The tertiary winding shall be

closed.

5*. A single-phase voltage shall be applied between the three connected HV terminals

and neutral. The LV terminals shall be open-circuited. The tertiary winding shall be

opened (see subclause ‎10.5.11.5).

6*. A single-phase voltage shall be applied between the three connected HV terminals

and neutral. The LV terminals shall be short-circuited. The tertiary winding shall be

opened.


and neutral. The HV terminals shall be open-circuited. The tertiary winding shall be

opened.

*The tests shall be performed only on first auto-transformer.

V

V

V

V

V

V

Low voltage

Neutral Tertiary

High voltage

Low voltage

Tertiary

Neutral

High voltage

Low voltage

Tertiary

Neutral

High voltage

Low voltage

Neutral Tertiary

High voltage

V

V


SEPTEMBER 2017

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11.3 Tests (cont.)

11. 3.3 Special Tests (cont.)

a. Measurement of zero-sequence impedance (cont.)


and neutral. The HV terminals shall be short-circuited. The tertiary winding shall be

opened (see subclause ‎10.5.11.5).

*The tests shall be performed only on the first auto-transformer.

b. Measurement of no-load loss and exciting current at low voltage

The auto-transformer shall be supplied between one LV line terminal and the neutral

terminal. The measurements shall be made at rated frequency and at a voltage equal to

0.1 Un/3. One of the other phase is shorting. The indication of the instrument will

give the excitation current and active power on the supplied phase. The test will be

repeated on each phase.

Measurement phase Shorting phase

L1N L2N

L2N L3N

L3N L1N

N

The Special Tests shall be performed on each three-phase auto-transformer.

0.1 Un/3

L1 L2 L3

A

Low voltage

Neutral Tertiary

High voltage

V

V


SEPTEMBER 2017

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11.3 Tests (cont.)

11.3.4.Back to Back Test

a. The Back To Back test shall include the following tests:

- measurement of no-load loss and no-load current,

subclause ‎11.3.2g ;

- measurement of load loss, subclause ‎11.3.2e;

- heat run test subclause ‎11.3.1 ;

- measurement of sound pressure/intensity ‎11.3.1f;

- auto-transformer GIC thermal evaluation, subclause ‎11.3.7;

b. The purchaser and manufacturer shall agree whether the test included the test listed

above. In case of affirmative the clauses: 11.3.1a, 11.3.2e, 11.3.2g shall be performed

during the “Back to Back Test”.

c. The test requires two identical three-phase auto-transformers. During the test they

shall be connected in parallel.

d. The test procedure and connection diagram including test instruments shall be

agreed between manufacturer and purchaser.

e. Test procedure as proposed by the manufacturer shall be agreed prior to order

placement.

f. The auto-transformer GIC thermal evaluation test (see subclause 11.3.7) is

performed shortly after the heat run test, subclause 11.3.1 0 .

e. For direct measurement of auto-transformers hotspot temperatures in addition to the

fiber optic probes (see subclause 10.5.20.1.2), the manufacturer will install

thermocouples directly to the critical metallic parts, like: tie-plates, clamp plates etc.

Additional thermocouples shall be installed on top and bottom of coolers. The

locations of the thermocouples shall be agreed between the purchaser and

manufacturer, and shall be based on manufacturer calculation.

f. Gas-in-oil analysis by pre-approved laboratories only (see table B, Appendix 1):

Before and after the temperature rise tests a gas-in-oil analysis shall be performed,

according to clause 7.12 , IEC 60076-2/2011, Annex. D “Dissolved gases analysis for

the detection of local overheating”, IEC 61181/2007, see Appendix 1.


SEPTEMBER 2017

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11.3 Tests (cont.)

11.3.5.Insulation Levels and Dielectric Tests:

11.3.5.1.The three-phase auto-transformer shall be subjected, after assembly to high

potential tests between windings, to earth and other windings and induced voltage

tests in accordance with the IEC Publication 60076-3/2013, (Part 3 - Insulation

levels and dielectric tests) unless otherwise specified.

Before the tests, the Manufacturer shall supply a description of the test procedure

and connection diagram of the auto-transformer, voltage sources, that he intends to

use for each dielectric test.

Each three-phase auto-transformer shall be subjected to and shall satisfactorily

withstand the following dielectric tests as routine tests, according to the

corresponding clauses of IEC 60076-3/2013, table 1:

a. Applied voltage test corresponding to insulation level of neutral (see clause

10).

b. Lightning impulse test:

-Lightning impulse withstand test, full wave of line terminal and neutral

terminal (see clause 13.2);

-Lightning impulse withstand test, chopped wave on line terminal (see clause

13.3);

d.. Switching impulse test for the HV (400 kV) line terminal (see clause 14);

e. Induced AC voltage test with partial discharge measurement according to

subclause 11.3.

f. Measurement of the dielectric dissipation factor (tanδ) and the capacitance

(50Hz), on fully assembled auto-transformer for all possible elementary

insulating zones of auto-transformer .

g. Measurement of insulation resistance and the polarization index for all

possible elementary insulating zones of auto-transformer.

i. The manufacturer shall provide the auto-transformer capacitance equivalent

circuit including the capacitance values. The circuit shall be based on the

windings arrangement and shall content the capacitance between windings, the

capacitance of the windings to core, the capacitance of the windings to tank. The

circuit diagram shall be attached only to the first auto-transformer test report.


SEPTEMBER 2017

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11.3 Tests (cont.)

11.3.5 Insulation Levels and Dielectric Tests (cont.):

11.3.5.2. Lightning impulse test

a. Rated lightning impulse withstand voltage 1.2/50 sec (see clause ‎10.5.3.1).

400 kV line terminal -1425 kV peak

170 kV line terminal - 650 kV peak

common neutral terminal - 250 kV peak

TV winding - Manufacturer's choice, shall be minimum 200 kV peak.

b. The lightning impulse test, full wave shall be according to IEC 60076-

3/2013, clause 13.2.

c. The test impulse shall be a full standard lightning impulse: 1.2 ± 30% /50 μs ± 20%.

d. The test with lightning impulse chopped on the tail shall be according to IEC

60076-3/2013, clause 13.3.

d. The lightning impulse test, full wave shall be applied between each HV(400

kV), LV(170 kV), TV winding terminal and ground.

e. The crest value of voltage for the reduced full-wave test shall be between 50%

and 70% of the full wave test.

f. During the impulse tests on line terminal, terminal of windings not under test

are likewise earthed directly or through impedance so that the voltage appearing on

them is limited to less than 75% of their rated lightning impulse withstand voltage.

g. The neutral may be verified by an impulse test applied through line terminal.

i. The common neutral terminal is connected to earth through an impedance, and

the voltage amplitude developed across this impedance, when a standard lightning

impulse is applied to the line terminal, shall be equal to the rated withstand

voltage of the neutral terminal. The amplitude of the impulse applied to the line

terminal is not prescribed, but shall not exceed 75% of the rated lightning impulse

withstand voltage of the line terminal.

j. The test is successful if there are no significant differences between voltage and

current transients recorded from the lowest voltage reference impulse and those

recorded at the full test voltage. Test acceptance criteria is according to clause

13.2.2.2, IEC 60076-3/2013.


SEPTEMBER 2017

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11.3 Tests (cont.)


11.3.5.2 Lightning impulse Test. (cont.)

k. The lightning impulse test, chopped wave is a test on line terminal of a winding.

It shall be combined with the full lightning impulse test in the manner described

below.

l. The lightning impulse test, full wave is combined with the lightning impulse test

chopped wave. The recommended order of the different impulse applications is:

- one reduced full impulse;

- one full level full impulse;

- one or more reduced level chopped impulse(s);

- two full level chopped impulses;

- two full level full impulses;

m. The chopped wave lightning impulse shall have a time to chopping between 3 μs

and 6 μs (see clause 13.3.1, IEC 60076-3/2013).

11.3.5.3.Rated switching impulse withstand voltage for the HV (400 kV) terminal

(see clause 14 ,IEC 60076-3/2013):

400 kV line terminal -1050 kV peak

Time to peak (Tp) of wave at least - 100 sec

Time above 90 % of the specified amplitude (Td) of at least - 200 sec

Time to zero (Tz) of a minimum - 1 000 μs

The test sequence shall consist of one reference impulse of a voltage between 50 %

and 70 % of the full test voltage and three impulses at full voltage.

11.3.5.4. Applied voltage test (see clause 10, IEC 60076-3/2013):

Neutral terminal - 95 kV r.m.s.

TV winding - Manufacturer's choice, shall be minimum 70 kV r.m.s.

The peak value of voltage shall be measured. The peak value divided by √2 shall be

equal to the test value. The full test voltage shall be applied for 60sec.

The test is successful if no collapse of the test voltage occurs.


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11.3 Tests (cont.)


11.3.5.5.Induced AC voltage test with Partial Discharge Measurements:

The induced AC voltage test shall be performed as follows (see subclause 11.3, IEC

60076-3/2013):

11.3.5.5.1.The partial discharge measurement shall be carried out on 400 kV

bushings.

11.3.5.5.2.The common neutral shall be earthed.

11.3.5.5.3.The quality of the insulation shall be judged according to the value of the

apparent charge.

11.3.5.5.4.The partial discharge measurement shall be carried out according to latest

IEC Publication 60270/2000.

11.3.5.5.5. The time sequence for the application of test voltage is illustrated in figure

1, subclause 11.3, IEC 60076-3/2013.

11.3.5.5.6. The voltage to earth shall be (see subclause 7.3.3, IEC 60076-3/2013):

U1=1.73 Um/√3 - enhancement voltage level;

U2=1.5 Um/√3 – one hour PD measurement voltage;

11.3.5.5.7.The test is successful if all the following criteria are fulfilled (see subclause

11.3.5, IEC 60076-3/2013):

a) no collapse of the test voltage occurs;

b) none of the PD levels recorded during the one hour period exceed 250 pC;

c) the PD levels measured during the one hour period do not exhibit any rising trend

and nosudden sustained increase in the levels occur during the last 20 min of the test;

d) the measured PD levels during the one hour period do not increase by more than 50

pC;

e) the PD level measured at a voltage level of 1.2 Um/√3 after the one hour period

does not exceed 100 pC.


SEPTEMBER 2017

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11.3 Tests (cont.)


11.3.5.6.Measurement of the Dielectric Dissipation Factor (tanδ) and the

Capacitance (at 50 Hz):

11.3.5.6.1.Measurement of the Dielectric Dissipation Factor (tanδ) and the

Capacitance (at 50 Hz):

11.3.5.6.2.Measurement of the dielectric dissipation factor shall be made on fully

assembled auto-transformer. HV terminal, LV terminal and neutral terminal shall be

connected together (short circuit); TV terminals shall be connected together (short

circuit). Tank shall be grounding. Test taps of the all bushings shall be connected to

guard of measuring instrument. The voltage test shall be 10 kV a.c.

a. Between HV (400 kV) winding and the tank. The voltage shall be applied on HV

(400 kV) terminal.LV terminals and core terminal shall be connected to guard of

measuring instrument.

b. Between TV winding and the tank. The voltage shall be applied on TV terminal.

HV terminal and core terminal shall be connected to guard of measuring instrument.

c. Between HV (400 kV) winding and TV winding. The voltage shall be applied on

HV terminals. TV terminals connected to input of measuring instrument. Core terminal

and tank shall be connected to guard of measuring instrument.

d. Between HV (400 kV) winding and the core. The voltage shall be applied on HV

(400 kV).LV terminals and tank shall be connected to guard of measuring instrument.

e. Between TV winding and the core. The voltage shall be applied on TV terminal. HV

terminals and tank shall be connected to guard of measuring instrument.

f. Between “Core” bushings and the tank. The voltage shall be applied on Core and

shall be 0.5 kV a.c. HV, TV terminals and “Core Frame” bushing shall be connected to

guard of measuring instrument (see ‎10.5.9).

g. Between “Core Frame” bushing and the tank. The voltage shall be applied on

Frame and shall be 0.5 kV a.c. HV ,TV terminals, and “Core” bushings shall be

connected to guard of measuring instrument (see ‎10.5.9).

h. Between “Core Frame” bushing and “Core” bushings. The voltage shall be applied

on Frame and shall be 0.5 kV a.c. HV ,TV terminals, and tank shall be connected to

guard of measuring instrument (see ‎10.5.9).


SEPTEMBER 2017

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11.3 Tests (cont.)


11.3.5.6 Measurement of the Dielectric Dissipation Factor (tanδ) and the

Capacitance (at 50 Hz) (cont.)

11.3.5.6.3.In the test report the temperature correction factor shall be indicated as a

function of temperature according to measurement results of Dielectric Dissipation

Factor during cooling of the transformer after temperature rise test. The reference

temperature shall also be indicated.

11.3.5.6.4.The capacitance of each winding to earth and the capacitance between

windings shall be determined by calculation from the measured values.

11.3.5.6.5.The Bidder shall include in the proposal a detailed description of the

instrumentation used for the above measurements.

11.3.5.6.6.The Dielectric Dissipation Factor (tanδ) for subclauses 11.3.5.6.2.a to

11.3.5.6.2.e shall be up to 0.5% at 10C ÷30C.

11.3.5.6.7.For each bushing the power and dissipation factor , capacitance test C1 (main

insulation) and C2 (tap capacitance) shall be measured and compare to the factory power-

factor test (see subclause ‎10.5.18.15). The voltage test shall be 10 kV a.c. for C1 and

2 kV a.c. for C2.


SEPTEMBER 2017

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11.3 Tests (cont.)


11.3.5.7. Measurement of Insulation Resistance and the Polarization Index:

a. The measurement of the Polarization Index (the ratio between apparent

insulation resistance at 10 min and 1 min ) , shall be made with 5 kV d.c. voltage.

The tank shall be earthed during all measurements.

b. The measurement shall be made:

b1. Between HV (400 kV) winding and grounded tank. TV terminals and core

terminal shall be connected to guard of measuring instrument.

b2. Between TV winding and grounded tank. HV terminals and core terminal

shall be connected to guard of measuring instrument.

b3. Between HV (400 kV) winding and TV winding. The voltage shall be

applied on HV terminals. The TV terminals shall be connected to input of

measuring instrument

Core terminal and tank shall be connected to guard of measuring instrument.

b4. Between HV (400 kV) winding and core. The TV terminals shall be

connected to guard of measuring instrument.

b5. Between TV winding and core. HV terminals and tank shall be connected to

guard of measuring instrument.

b6.Between every core bushing and ground tank. The HV and TV terminals

shall be connected to guard of measuring instrument. The voltage test shall be 1

kV d.c.

b7. Between core frame bushing and ground tank. The HV , TV , core

terminals shall be connected to guard of measuring instrument. The voltage test

shall be 1 kV d.c.

c. Test report for the Polarization Index measurement as well as variation of apparent

winding insulation resistance with time shall be provided.

d. Before the tests, the Manufacturer shall supply a description of the test

procedure and connection diagram of the auto-transformer, voltage sources, that

he intends to use for each dielectric test.

e. In the test report the temperature correction factor shall be indicated as a function

of temperature. The reference temperature shall also be indicated.


SEPTEMBER 2017

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11.3 Tests (cont.)

11.3.6.Ability to Withstand Short Circuit

11.3.6.1.The three-phase auto-transformer shall be designed and constructed to

withstand without damage the thermal and dynamic effects of external short circuits

according to IEC Publication 60076-5/2006.

11.3.6.2.The thermal ability to withstand short circuit shall be demonstrated by

calculation and shall be stated in ANNEXURE ‘B2’ – 'Summary of Data', clause 5.18

11.3.6.3.The duration of all types of external short-circuits shall be up to 3 sec.

11.3.7.Geomagnetically induced current (GIC) Withstand Capability Test

11.3.7.1.Geomagnetically induced currents (GICs) can cause saturation of the

magnetic circuit of transformers in a power system. This saturation can increase the

MVAR absorption of the transformers, leading to voltage-control problems,

generating significant harmonic currents, and cause heating of the internal

components of the transformer itself, leading to gas relay alarm/operation as well as

possible damage.

11.3.7.2.The GIC test shall be performed with two auto-transformers of the same type

during the “back to back” test (see subclause ‎11.3.4). The HV terminals shall be

connected together and the rated voltage and excitation current applied to the parallel

connected tertiary terminals (see clause 10.5.11). The LV terminals shall be open-

circuited during test.

11.3.7.3.The autotransformer neutrals shall be subjected to 10 A, 20 A, and 30 A per

phase dc currents for a 30-min duration, while full forced cooling.

11.3.7.4.The first set of tests shall be conducted with rated excitation voltage applied

and step increase in dc injection of 10 A per phase. Once the temperature reached the

steady state value (see clause ‎10.4.14.5), the current shall be stepped back to 0 A

while continuing to record temperatures until they again reach steady-state values.

11.3.7.5.During test the following characteristics shall be recorded:

- Applied ac voltage

- Injected dc current

- Exciting per/phase winding current

- No load losses

- Exciting current harmonics (% and order to at least 11th harmonic) and total harmonic

distortion

11.3.7.6. Hot-spot temperature of the internal transformer components (tie plates, clamps,

windings, core) measured by fiber optic temperature probes (see clause 5.27.4, ANN ‘B2’).

- Thermo-vision scanning of the transformer tank (walls and cover)

- Top & bottom transformer oil temperature and ambient temperature

- Measure transformer sound level at no—load (100% voltage) and at dc injection of

30A/phase, test procedure shall be agree between manufacturer and purchaser.

- Gas-in-oil analysis by pre-approved laboratories only (see table B, Appendix 1): Before

and after the temperature rise tests a gas-in-oil analysis shall be performed, according to

clause 7.12 , IEC 60076-2/2011, Annex. D “Dissolved gases analysis for the detection of

local overheating”, IEC 61181/2007, see Appendix 1.




SEPTEMBER 2017

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11.4.Site Acceptance Test for Auto-Transformer

The auto-transformer shall be tested at site by the Purchaser during

commissioning. The site tests shall be carried out in the presence of Manufacturer

representatives. A Guide line for the site testing shall be provided by Contractor.

The Guide line shall include, but not be limited to, the following tests:

11.4.1. Auto-Transformer tests

a. Ratio and polarity tests.

b. Measurement of Insulation Resistance and Polarization Index.

c. Measurement of Dielectric Dissipation factor (tan) and the capacitance (at

50 Hz) of winding and bushing insulation.

d. Measurement of no-load loss at 10 % of nominal voltage of winding.

e. Measurement of impedance at small current.

f. Measurement of winding resistance.

g. SFRA Fingerprint Test shall be carried out on arrival at site (see subclause

11.3.2 0).

11.4.2.Current Transformer tests (see clause 10.5.19 )

a. Ratio and polarity tests.

b. Checking of excitation curve.

c. Measurement of Insulation Resistance.

d. Measurement of winding resistance.

11.4.3.Transformer Oil test (see table B, Appendix 1) shall be based on methods and

standards as specified by IEC60422/2013, table 3. The inhibitor content according to IEC60666/2010 and DGA according to IEC61171.

All the test should be within the limits of the table 3, IEC60422/2013. The passivator

should be below DL (detection limit) and TG% (total gases % by vacuum extraction)

below 0.5%.

11.4.4.Oil leakage test of tank (according to manufacturer’s recommendation).

11.4.5.Test of the transformer's auxiliaries and operation circuits (according to

manufacturer’s recommendation)

11.4.6. Dew point test shall be performed before transformer oil filling (see clause

‎12.1)


SEPTEMBER 2017

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12. Packaging and Delivery

12.1.©Auto-transformer Transportation without oil and Dew Point Test

12.1.1.Each three-phase auto-transformer shall be shipped to Purchaser with dry air

under controlled air pressure. Gas pressure shall be 5 psi (about 0.3 atm), and shall be

maintained until commissioning. The gas pressure shall remain positive even in the

coldest weather.

12.1.2.The source of dry air shall have the dew point of –50 °C (–58 °F) or lower.

12.1.3.Prior to shipment, a dew point test shall be made. The auto-transformer shall

have all bushings removed and shall be filled with dry air under a slight positive

pressure not to exceed 5 psig. The auto-transformer shall then rest for 24 hours prior

to performing the dew point test.

12.1.4.The manufacturer shall measure the tank pressure, the insulation temperature,

the dew point in degrees Celsius several times during the equalizing period (12–48 h)

to assure that equilibrium is achieved. Based on the above parameter values the

moisture content in percent of dry weight of the auto-transformer insulation shall be

up to 0.5%.

12.1.5.If the dew point readings indicate an average moisture content in percent

of dry weight of the auto-transformer insulation is higher than 0.5%, the

manufacturer must dry the auto-transformer.

12.1.6.The dew point test shall be provided for each delivered auto-transformer and

shall be enclosed to the test report. It shall be according to IEEE Std. C57.93-2007

and manufacturer recommendation.

12.1.7.The tests should be performed by a device with a capacity sensor as Vaisala or

Domino or equivalent. The device measures the relative saturation of oil with water in

transformer oils. The tests should be in concordance with device test specifications.


SEPTEMBER 2017

page B1- 98

12. Packaging and Delivery(cont.)

12.2.Auto-transformer Transport on Site and Lifting

12.2.1.The auto-transformer shall be equipped with the following accessories

to permit moving the assembled and oil-filled auto-transformer on wheels or rollers

to permit periodical exchange of each auto-transformer with reserve unit, lifting and

untanking.

- Bi-directional flanged wheels for moving the auto-transformer parallel to the

both axes.

- Pulling eyes on each side of the tank and jacking pads.

- Lifting lugs for lifting the complete auto-transformer and for untanking the

core and coil assembly.

12.2.2.The fully assembled auto-transformer with or without oil may be safely

tilted 10 degrees.

12.2.3.The jacking pads shall have a suitable clearance from underside to base. The

pads shall have a free surface for the head of the jack.

Location of pads shall permit use of jacks without fouling any part of auto-

transformer.

12.2.4.The arrangement of jacking pads and base members shall be such that the

auto-transformer can be safely jacked, using a pair of pads parallel to either axes.

12.2.5.The flanged wheels shall be arranged so that they can be turned through an

angle of 90 when the tank is jacked up clear of the rails floor.

12.2.6.The design and location of lifting points (for untanking the core and coils)

shall be such as to preclude distortion of the core, or damage to the core, or damage

the winding and tap changer insulation under lifting stresses. Lifting stress shall not

be transferred between top and bottom clamps through the core iron.

12.2.7.The manufacturer will provide all the necessary means for the anti-seismic

blocking and anchor of the auto-transformer wheels after its installation (see clause

‎10.1.3 and subclause ‎10.5.12.5).

12.2.8.The wheels shall be suitable for rails type S49 (according to DIN5902) or U50

(according to French standard). The transformer rail wheels system shall be design by

the manufacturer and it shall be approved by the purchaser (see clause 3.1., ANN

‘B2’, clauses 7.3 c, Appendix 13.).



SEPTEMBER 2017

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13.Rating plate

13.1.Each auto-transformer shall be provided with a rating plate of weatherproof and

corrosion resisting material. It shall be fitted in a position clearly visible to the

operator. The nameplate shall be protected from UV radiation, withstand the

service conditions specified under clause ‎10.1.1, durable and readable during the

entire power transformer life duration.

The plate shall be marked in English.

When there are two control cabinets a rating plate will be installed on each

cabinet.

13.2.Rating plate shall list the rating of the auto-transformer for each cooling stage

(see subclause ‎10.5.6.1‎10.5.7.1 ANN. 'B1' and 5.6. ANN 'B2') at winding

temperature rise as described at clause ‎10.4.2.1a, in addition to the data specified in

Publication 60076-1/2011 clause 8.

13.3.A vector diagram shall be shown for phase sequence and terminal markings

shall be shown on this vector diagram.

13.4.A connection diagram showing internal connections and terminal markings

shall clearly define, by means of arrows or numbering, the relative polarities of

the windings in each phase.

13.5.Details regarding tapping including impedance and voltage values for the

principal and extreme taps shall be shown on the rating plate.

13.6.The guaranteed (clause 5.30. or 5.31. Ann. ‘B2’) and calculated sound power

level (clause 11.3.1‎0) of the three-phase auto-transformer, under full load and no-load

with all cooling sections in operation, with or without reduction walls based on auto-

transformer design, shall be shown on the rating plate.

13.7.The nameplate coding used to describe the insulation system characteristics shall

be shown on the rating plate and shall be according to clauses 8.2.1, 9.1 and Ann. ‘D’

of IEC 60076-14/2013 (clause 5.16.18. of Ann. ‘B2’).

13.8.Plates with identification and characteristics of auxiliary equipment according to

standards for such components (bushings, tap-changers, current transformers, special

cooling equipment) shall be provided on the components themselves.

14. PROGRESS REPORT

Progress reports shall be submitted in accordance with clause 7 of the GENERAL

CONDITIONS - ANNEXURE 'A'. For details see also Appendix 5.






SEPTEMBER 2017

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15.COMMENTS BY BIDDER ON ANNEXURE 'B1'


SEPTEMBER 2017

page B1- 101

16.DEVIATIONS FROM REQUIREMENTS

Bidder is requested to describe or indicate deviations of the equipment

and accessories from all requirements in ANNEXURE 'B1'.

In case no deviations are mentioned it will understood that Bidder's offer

entirely complies with all requirements in ANNEXURE 'B1'.


SEPTEMBER 2017

page B1- 102

APPENDICES

Number Name File

Ann. D CONTRACTOR’S TECHNICAL PERFORMANCE

GUARANTEES annD.pdf Ann. R DELIVERY, SHIPMENT AND HANDLING

0180 - IEC - Anx - R - Delivery 2005 F rev 2009 02 L rev 2014 03 05.pdf

Ann. R1 Distribution of Shipping Documents 0181 - IEC - Anx - R - R1 - rev 2014 03 05.pdf

App. 1 MINERAL INSULATING OIL SUPPLIED FOR BEYOND

400 KV POWER TRANSFORMER - NO’ 51/2016 app1_51.pdf

App. 2 SILICA GEL FOR USE AS DESICCANT IN

TRANSFORMER AIR DEHYDRATORS - NO’ 804/2011 app2.pdf App. 3 Specification for Coating Requirements of Power Transformers

and/or Arc Suppression Coil - 2009-217-141707 app3.pdf App. 4 Specification for coating galvanized tin or aluminum cabinets

by Liquid or powder coating - 217-000260-2015 app4.pdf

App. 5 QUALITY REQUIREMENTS FOR CONTRACTS

EXECUTION (Q-APP-02) app5-Q - APP - 02 Rev4.pdf

App. 6 CONTROL CUBICLES - WIRING STANDARD

SPECIFICATION EPD - A.03/2004 app 6 wiring EPD-A-03.pdf

App. 7 RELIABILITY, AVAILABILITY, MAINTAINABILITY

(RAM) app7_ram.pdf App. 8 VOLTAGE CONTROL SYSTEM REQUIREMENTS

app8VR.pdf App. 9 PROCEDURE FOR HANDLING NON-CONFORMANCE

app9.pdf App. 10 Report of Sound Pressure/Intensity Level Measurement and

Sound Power Calculation, Auto-Transformer with noise

reduction walls app10WithWalls.pdf

App. 11 Report of Sound Pressure/Intensity Level Measurement and

Sound Power Calculation, Auto-Transformer without noise

reduction walls app11NoWalls.pdf

App. 12 CYBER REQUIREMENTS: NON-DISCLOSURE

AGREEMENT, CYBER SECURITY GENERAL

REQUIREMENTS, and SECURITY OF PROJECT

PERFORMED BY VENDOR ABROAD.

app12.pdf

App. 13 ATR 650 MVA 400/170KV INDOOR TRANSFORMER

INSTALLATION LAYOUT, SECTION S1E-2778-03_01.pdf


SEPTEMBER 2017

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SUMMARY OF DATA FOR 400/170 KV,

650 MVA, LOW NOISE

3 PHASE AUTO-TRANSFORMER

ANNEXURE 'C' SPECIFICATION SR-153

SEPTEMBER 2016

page B1- 104

SUMMARY OF PRICES FOR 400/170 KV,

650 MVA, LOW NOISE

3 PHASE AUTO-TRANSFORMER