graung fault

7/29/2019 Graung Fault

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Instructions @ GroundFaultProtectionSystemsPerformance Testing

G E N E R A L @ E L E C T R I C


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Performance Testing Ground FaultProtection SystemsCONTENTSDESCRIPTION PAGEGeneral Information 2Checklist for G.F.Testing 3Test Methods 3,4Test Equipment 4Notes on Testing 4Test Diagrams for Systems

with G.F.Relays 5 to 12Test Diagrams for Systems

with Integral G.F.P. 13 to 16Test Record Forms 17 to 20

The Circuit Diagrams included in this manual are for illus-tration of typical applications and are not intended as con-structional information. Although reasonable care has beentaken in their preparation to assure their technical correct-ness, no responsibility is assumed by the General ElectricCompany for any consequences of their use.The devices and arrangements disclosed herein may becovered by patents of General Electric Company or others.Neither the disclosure of any information herein nor the saleof devices by General Electric Company conveys anylicense under patent claims covering combinations of de-vices with other devices or elements.In the absence of any express written agreement to the con-trary, General Electric Company assumes no liability forpatent infringement arising out of any use of the devicesor elements by any purchaser of devices or others.

PURPOSEThe purpose of this publication is to provide instructionsfor testing ground fault protection (GFP) systems in GeneralElectric low-voltage equipment. These instructions are foruse with equipment built by the Distribution EquipmentDivision, in accordance with the National Electrical Code,Section 230-95.NE C 230-95(c) reads as follows:(c) The ground fault protection system shall be perform-ance tested when first installed. The test shall be conductedin accordance with approved instructions which shall beprovided with the equipment. A written record of this testshall be made and shall be available to the authority havingjurisdiction.

INSTRUCTIONS APPLICABLE TOEQUIPMENT Switchboards:

Type AV & PowerbreakLow-Voltage Switchgear:

AKD-6 8.AKDSCIRCUIT BREAKERS Insulated-Case & Molded Case

Breakers with VersaTrip, SelecTripor MicroVersaTrip Trip.LV Power Circuit BreakersType AKR with-SST or MicroVersaTrip Trip.

FUSIBLE SWITCH Type HPCIHPR High PressureContact Switch with IntegralGround Fault Tripping

GROUND FAULT Ground-Break System or similarRELAYS & SENSORS ground fault relays and sensors

(CT's) used to trip any circuitbreaker or switch with a shunttrip.

TESTING BY QUALIFIED PERSONNELPerformance testing of the ground fault protection systemshould be undertaken only by qualified personnel. Partic-ularly in the tests requiring the use of a high-current testset, it is usually necessary to obtain the services of a quali-fied testing organization. General Electric's Installation andService Engineering organization and the Apparatus Ser-vice Shops are qualified and equipped to provide thistesting service.


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Checklist ForGround Fault Performance TestingPROBLEMS THAT MAY BE ENCOUNTEREDTHAT CAN PREVENT PROPER GFP OPERATION HOW TO CHECK FOR THIS CONDITION1. On 3-phase Cw ire systems, the neutral conductor shouldnot have additional grounding connections made down-stream from the main bonding jumper which must belocated in the service entrance section. (Refer to NEC250-23). This condition may cause loss of sensitivity insensing ground fault current.2. Neutral sensor in residual sensor arrangements or withintegral G.F. tr ip breaker may be installed with incorrectpolarity with respect to the associated phase sensors.This wi ll cause false tripping by reading balanced .loadcurrent as imbalanced and interpreting the error slgnalas a fault situation.

I By visual inspection.I By measurement of resistance between neutral con-ductor and ground bus.In the high-current tests this condition may be thecause if it takes over 150% of G.F. current sett~ng oinitiate tripping.

( By visual inspection.3. Neutral conductor ina load circuit must pass through azero-sequence sensor in the same direction as the phaseconductors. Unbalanced signals cause false tripping.

In the high-current testing the "no-trip" tests will detectthis condition-4. When a given circuit is monitored by a zero-sequencesensor, none of the conductors shall be omitted frompassing through the sensor. Unbalanced signals causefalse tripping.5. An equipment bonding or grounding conductor must notbe passed through the window of a G.F. ensor. This willcause cancellation of error signals, and will prevent G.F.trippina when it is needed.

Testing Methods

Inspect load cables and grounding connections betweenconduits and the switchboard ground bus. The groundingconnections must not pass through a zero-sequence sensor,with ~h a se nd neutral wires.. - I

GENERAL

6. The ground fault protection may be rendered inoperableby damaged wiring or devices, blown or missing controlfuses, or lack of tripping power when supplied from aremote source.

There are two alternate test methods for evaluating groundfault protection (GFP) systems- y using simulated faultcurrent or by high-current primary injection. Both testmethods are applicable to ground-fault relay systems, butonly the high-current primary injection method can be usedto test a system with integral ground-fault tr ip circuitbreakers.

If the high-current tests do not produce expected tripping,check for control power at transformers, at fuses, and atrelays.

If it is acceptable to the local inspection authorities, groundfault relay systems may be tested by the simulated faultcurrent testing method combined with a thorough visualinspection. Otherwise, it will be necessary to use the high-current primary injection test method.GROUND FAULT PROTECTION TESTINGWITH SIMULATED FAULT CURRENTIn the simulated fault current method, a simulated faultcurrent is generated by a coi l around a window-type sensoror by means of .a separate test winding in the sensor. Whenthe monitor panel sends a small current through the testwinding, it produces a secondary current in the sensorwhich the relay responds to as if it were caused by a pri-mary current of 1600 amperes.

In an equivalent method which can be used with anywindow-type sensor supplying a ground fault relay, a num-ber of turns of wire are wrapped around the sensor core,such as twenty turns of #14 wire. A current of approxi-mately 125 percent of the pickup setting of the relaydivided by the number of turns is passed through the wireto simulate the ground-fault current. By setting the relaypickup to the low end of the range, the test current maybe kept to a minimum.Testing with simulated fault current provides a means ofdemonstrating the operation of the sensor, relay and shunttrip and the adequacy of the control power supply. In addi-tion to these items, the GFP system must be checked toconfirm .that neutral ground points are located correctlywith respect to sensors, that sensor polarities are correctwhen several are connected in parallel, and that conductorswhich pass through a sensor window all run in the samedirection. If done thoroughly by a qualified person, a visualinspection can confirm that these items have been takencare of correctly.The importance of supplementing simulated fault currenttesting with an adequate inspection is emphasized whenone realizes that the first five items on the Checklist (seeabove) are problems that can NOT be detected by simu-lated fault current testing alone.


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Testing MethodsContinued

GROUND FAULT PROTECTION TESTINGBY HIGH-CURRENT PRIMARY INJECTIONThe high-current injection test method may be used to testGFP systems with either ground fault relays or integralground fault trips on circuit breakers. With relays, it is analternative to simulated fault-current testing supplementedby inspection. We recommend it as the best way to testthe performance of GFP systems with relays.Integral ground fault protection in circuit breakers can besystem-tested only by using the high-current injection testmethod. The internal electronics of these breakers can bechecked out with test sets such as Cat. No. TAK-TS2,which is used with AKR-SST/ECS trips and with VersaTripMod. 2 or TVTSl used with MicroVersaTrip. These sets arenot suitable for making a system test, however.High-current testing of GFP systems consists of injectingfull-scale current into the equipment phase and neutralconductors to duplicate the flow of ground fault currentunder various conditions. The testing equipment requiredincludes a high-current supply capable of delivering up to1000 amperes or more at 2.5 volts, or similar. By using thelower ground fault current pickup settings on relays andbreakers or switches, the current required to trip can bekept to a minimum, such as 300 or 400 amperes or less. Ifinspection authorities require tests at full GFP setting, acurrent supply capable of delivering 1200 amperes or moremay be needed.Connect the current supply as shown in the diagrams, usingflexible welding cable such as No. 2 AWG. Also connectjumpers between the points indicated in the tables ac-companying the diagrams.

Test Diagrams ForSystems With GroundFault RelaysPAGE 5 THROUGH PAGE 12

FIGURE DESCRIPTIONMain Breaker with G.F. Relay and Ground ReturnSensorMain Breaker with G.F. Relay and Zero-SequenceSensor ArrangementMain Breaker with G.F. Relay and ResidualSensor ArrangementFeede r Breaker wi th G.F. Relay an d Zero-Sequence Sensor ArrangementGround Fault Relay Protection on Normal andEmergency Main Breakers Interlocked for Auto-matic ThrowoverGround Fault Relay Protection on Normal andEmergency Main Breakers with Automatic Trans-fer Switch (3-pole)Double-ended Substation- Transformers notindividually grounded)Single-point Ground and G.F. RelaysDouble-ended Equipment- both sourcesgrounded)Modi fied Differential Scheme with G.F. relays.

GROUND FAULT PROTECTION INTHREE-WIRE EQUIPMENTGround fault protection can be provided for 3-wire and4-wire equipment fed from a solidly grounded 4-wire supply,wye or delta. NEC Article 250-23(b) requires that whenevera service is derived from a grounded neutral system, thegrounded neutral conductor must be brought into the ser-vice entrance equipment, and bonded to the equipment en-closure and ground bus, even if the grounded conductoris not needed for the load supplied by the service. Thisis required to provide a low-impedance ground fault currentreturn path to the neutral to assure operation of the over-current device.

Test Notes:1. All tests are for 3-phase, 4-wire unless noted as 3-phase3-wire.2. Notes on diagrams referring to tripping at G.F. settingare intended to imply nominal values. Consistent trip-ping may require 125% of pickup settings, and goodtime-delay figures may be obtained only at 150% andhigher.3. WARNING In all the illustrations the source trans-fo rmer (~ ) must be deenergized when applying andusing the test current.4. A temporary source of control power (usually 120 VAC)will be needed for operation of Ground-Break relays andshunt trip devices.5. For information on the Ground-Break System, refer topublications GEI-86126 & GET-2964.


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Test DiagramsFIGURE 1Main Breaker with G.F. Relay and Ground-Return Sensor

r------------------3-Phase, 4-WireTransformer I 1I !y ' wMain A2n IAnI ' n II n aI vI I N1 9I I~++e- - + ---- -t---N L

rn I I Feeder IGround G.F.Fault RelayTestCurrent I ISupply II IITo Loads IGroundBUS

--- --------A- EquipmentEnclosureConnect TestCurrent SupplyI t I

t In &wire equipment the load ne utral is not furnished.

1-1

Connect Jumperbetween Points

A1 and N1

ResultsExpected Comments

A2-G 1 Main breakertripConfirms continuity ofground path from groundbus to neutral


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FIGURE 2Main Breaker with G.F. Relay and Zero-SequenceSensor Arrangement

EquipmentEnclosure

I-----------------

3-Phase, 4-WireTransformer 1I I! il Mainn n ~2 I--I ' n Ian w

Connect TestTest Current SupplyI No. I Points2-1

NOTE: I t is not necessary to repeat the tests for each phase i f a visual inspect ion conf irmsthat all phases go through the sensor window.t In 3-w ire equipment the load n eutral is not furnished. Om it Test 2-1.

1 INI tIN--ke--t--.,


2- 2

A1 and N1

N2-0-

ResultsExpected

- --A1 and N1

I- II?--NLt

GroundIIFault ITestCurrent I

Supply IIII

Comments

A2-N2

ILTLJ-7 IRelay IIIIITo Loads IGround I

A2-GI

Main breaker"O ttrip

BUS

Confirms that neutraland phase conductorsgo through sensor and insame directionMain breakertrip

L--.

Confirms continuity ofground path from groundbus to neutral

I I4


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FIGURE 3Main Breaker with G.F. Relay and ResidualSensor Arrangement

r-----------------

3-Phase, 4-WireTransformer I 1-I ! ,A1:el II

I Z c 1 - II - wI I N1N

Comments

Ground Iault IestCurrent Iupply IIIConnect TestCurrent Supply1 20": to points

I IG.F. IRelay

vIIIII

To LoadsGround IBUSL II- EquipmentEnclosureConnect Jumperbetween Points

A1 and N11 3-1 1 B1 and N1C1 and N1t In 3-wire equipment, the load neutral and neutral sensor are not furnished. Omit Test 3-1.

ResultsExpectedA2-N2 BreakerB2-N2 should not Confirms correct polarityC2-N2 I trim I of sensor connections.

3-2 A1 and N1B1 and N1C1 and N1A2-G 1B2-G 1C2-G1 Breakershouldripm

Confirms continuity ofground path from groundbus to neutral.


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FIGURE 4Feeder Breaker with G.F. Relay and Zero-SequenceSensor Arrangementr-----------------3-Phase, 4-WireTransformer I 1I IA1 Main In II - wI nI wn a

w

II I II N'

- ~ 1 1 - .

IN-+ t---- IFeederGround

IFault Relay ITest ICurrent I II-,---- ISupply I II A2 III ITo LoadsGround I

BUS Ii-+---- I- EquipmentEnclosureNOTE: It is not necessary to repeat the tests for each phase ifa visual inspection confirmsthat all phases go through the sensor window.t On 3-wire feeders, the neutral conductor is not furnished. Omit Test4-1.

TestNo.

4-1

4-2

Connect TestCurrent Supplyto PointsA1 and N1

A1 and N1


A2-N2

A2-GI

ResultsExpectedBreakershould nottrip.Breakertrip.

Comments

Confirms correct polarityof sensor connections.Confirms continuity ofground path from groundbus to neutral.


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FIGURE 5Ground Fault Relay Protection on N ormal and Emergency MainBreakers interlocked for Automatic Throwover on 3-Phase4-Wire SystemSource#I Source #2

3-Phase, 4-WireTransformers

GroundFaultTestCurrentSupplyA3 83 C3 N3

aw

-

av

A7

A

Comments

Confirms correct polarityof sensor connections.

Confirms operation whenground return path isthrough neutral frommost distant ground.

r..T GR -G.F. RelayGS-G.F. SensorsLoad busResultsExpected

Breaker 52-1.should not trlp.

Breaker 52-2should not trip.Breaker 52-2should trip.Breaker 52-1should trip.

TestNo.

5- 1

5- 2

5-3

5- 4

ConnectTest CurrentSupply toPointsA1 and N1B1 and N1C1 and N1A2 and N282 and N2C2 and N2A2 and N282 and N2C2 and N2A1 and N1B1 and N1C1 and N1

ConnectJumperbetweenPointsA3-N3B3-N3C3-N3A3.N3B3-N3C3-N3A3-N1B3-N1C3-N1A3-N2B3-N2C3-N2

During the TestDisconnect Groundfrom Neutral a tPointsG1 and 62G1 and 62G1 and 62G I and 62G1 and 62G1 and 62G1 and 62G1 and 62G1 and 62G1 and 62G1 and 62G1 and 62


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FIGURE 6Ground Fault Relay Protection on Normal and Emergency MainBreakers with Automatic Transfer Switch (3-Pole) on 3-Phase4-Wire System

Source #I Source #2Transformers

GroundFaultTestCurrentsuP P ~ Y

NOTE: T h e A T S aux. s w i t c h e sa r e s h o w n w i t h A T S inNo r m a l p o s it i on .

Auto-Transfer GR - G.F. RelayGS -G. F. SensorsLoad bus

Comments

Confirms correctpolarity of sensorconnections.

Confirms operationwhen ground returnpath is throughneutral from mostdistant ground.

TestNo'TransferSwitFhPositlon

During the TestDisconnectGround fromNeutral atthese Points

TestCurrenttoPointsResultsUpected

G1 and 6 2G1 and 6 2G1 and 6 2G1 and 6 2G1 and 6 2G1 and 6 2G1 and 62g =:G1 and 6 2E i;;!E

NNN

ConnectjumperbetweenPoints

A1 and N1B1 and N1C1 and N 1A2 and N282 and N2C2 and N2A2 and N2B2 and N2C2and N2A1 and N1B1 and N1C1 and N1

Breaker 52- 1should nottrip.Breaker 52- 2should nottrip.Breaker52-2

Breaker 52-1Should trip.

6- 2

6- 3

6- 4

A3-N3B3-N3C3-N3- -4-N4B4-N4C4-N4A4-N1B4-N1C4-N1A3-N2B3-N2C3-N2

EEEEEENNN


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FIGURE 7Double-Ended Substation (Transformers Not IndividuallyGrounded) with Single-Point Ground and G.F. Relays on3-Phase 4-Wire System

GroundFaultTestCurrentSupply

NOTE: T ime-de lay se t t ing onG R-T m u s t b e 0.1 sec.f a s t e r t h a n G R- 1 a n dGR-2 to get select iv i ty.

Load Bus #1 Load Bus #2TestNo.

7- 17-2

7-3

7.4

ConnectTest CurrentSupply toPointsA1 and N1A2 and N2

A2 and N2

A1 and N1

ResultsExpectedBreaker 52-1should trip.Breaker 52-2should trip.Breaker 52-Tshould trip andBreaker 52-2should not trip(see note).Breaker 52-Tshould trip andBreaker 52-1should not tr ip(see note).

Comments

52-1 trips for a G.F. onload bus #I .52-2 trips for a G.F. onload bus #2.52-T trips for a G.F. onload bus #1, fed fromsource #2.

52-T trips for a G.F. onload bus #2, fed fromsource #1.

ConnectJumperbetweenPointsA3-G1A4-GI

A3-G1

A4-GI

BreakersOpen or Closed52-1

cc

o

c

52-Too

c

c

52-2cc

c

o


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FIGURE 8Double-Ended Equipment (Both Sources Grounded) usingModified Differential Scheme with G.F. Relays on 3-Phase4-Wire System

GroundFaultCurrent

NOTE: T h e b r e a k e r a u x. s w i t c h e sa r e s h o w n w i t h b r e a k e r si n o p e n p o si t io n .

confirmsolarity of orrecten-'Or

52-2 tr~p sor aG.F. on load bus#2.52-1 rips for aG.F.on load bus#1.52-T trips for aG.F. on load bus#2. -

TestNo.

8 1

8- 2

8- 3

8- 4

8-5

Connect TestCurrentSupply toPointsA1 and N1B1 and N1C1 and N1A2 and N2B2 and N2C2 and N2A2andN2B2 and N2C2 and N2A1 and N1B1 and N1C1 and N1A l and N1B1 and N1C1 and N1

ConnectJumperbetweenPointsA4-N4B4-N4C4.N4A4-N4B4-N4C4-N4A4.NI84 N1C4.NlA3-N2B3-N2C3-N2A4-N2B4-N2C4-N2

Durimisconnecthe TestGround fromNeutraltPoints

and G2GI and 62and 62GI and 62GI and 62G I and G2G1 and 6 2and G2GI and 62GI and 62G I and G2GI and 62GI and G2GI and G2GI and 62

ResultsExpected

Breakers 52-1an d 52.Tshouldrip. notBreaker 52-2should nottrip.Breaker 52-2shou~drip.Breaker 52-1trip.Breaker 52-Tshould trip.

BreakersOpen or Closed52-2

o0

cccc

oooooo

52-1

ccoooo

cccccc

52-T

cccccc

cccccc


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Test Diagrams For Systems Withlntegral Ground Fault ProtectionPAGE 13 THROUGH PAGE 16

FIGURE DESCRIPTION

9 Neutral Sensor Polarity Markings10 Main Breaker with lntegral GFP11 Feeder Breaker with lntegral GFP12 lntegral GFP on Main and Tie Breakers of Double-ended Equipment- -Phase, 4-Wire

NEUTRAL SENSOR POLARITY MARKINGSIn the accompanying integral ground fault protection cir-cuit diagrams the neutral sensors are depicted using con-ventional current transformer symbols. The equivalentpolarity markings for VersaTrip, SelecTrip, SST and MicroVersaTrip integral trip sensors are shown in the figurebelow.

FIGURE 9This diagram shows the equivalent polarity markings for neutral sensors that arenot marked like conventional current transformers.

Primary

LineLoad

r r U SecondaryTerminalBoardMicroVersaTripor SST

Conventional Versatrip or Selectrip Neutral SensorCurrent Transformer Neutral Sensor (Typical)

Note:WARNING In all the illustrations the source trans-former(~)must be deenergized when applying andusing the test current.

"LINE" end is equivalen t of HImarking."COM" terminal is equivalent of XImarking.

HI is primary polarity marking.XI is secondary polarity marking. "LINE" end is equivalent of HImarking."BLACK" terminal is equivalent ofXI marking.


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Test DiagramsFIGURE 10Main Breaker with Integral Ground-Fault Protection-3-Phase, 4-Wire

Equipment

3-Phase, 4-Wirer----------------

Transformer 7!y II ' Iaw I

Enclosure

*v III+ -N' I

I 4 4rmJ &-1I Nf L * l , r- J N2N+ ---- t k f -4I

Connect TestCurrent SupplyI ttt Points

FeederGroundFau ITestCurrent IISupply I. II

10-1

t In 3-wire equipment the load neutral is not furnished. Omit Test 10-1.

I[[;* III+ ITo Loads IConnect Jumperbetween Points

10-2

Ground IBUS I

A1 and N1

ResultsExpected

A1 and N1

Comments

A2-N2

A2-GI

Breakershould nottrip.This confirms that polaritand ampere rating ofthe neutral sensorthose of the phasesensors in the breaker.Breakershould trip atG.F. setting.Confirms continuity ofground path from groundbus to neutral.


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FIGURE 11Feeder Breaker with Integral Ground-Fault Protection-3-Phase, 4-Wire

3-Phase, 4-Wire ------------------ransformer I I Main 1I A_' n IwI ' n IA7n IawI II N1 IN--p+ --------- II '--*-N- I IGround I IFaultTest I

.Current IIIupply II L 4 . J II A3 III IGround To Loads IBUS-----"-5 I--------d- T; EquipmentEnclosure

TestNo.

11-1

Connect TestCurrent Supplyto Points

A1 and N1

Connect Jumperbetween Points ResultsExpected Comments

Breakershould nottrip.

This confirms that polarityand ampere rating ofthe neutral sensor matchthose of the phasesensors in the breaker.

11-2

t On 3-wire feeders the neutral conductor and neutral sensor are not furnished. OmitTest 11-1.

A1 and N1 A3-GI Breakershould trip atG.F. etting.Confirms continuity ofground path from groundbus to neutral.


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FIGURE 12Integral Ground Fault Protection on Main and Tie Breakers ofDouble-Ended Equipment- Phase, 4-Wire

NOTE: "a" aux. sw's arenormally open, i.e.,open when breakeris open.

Confirms hatsensor polarityCorrect.

52-2 trips for aG.F. on load bus#2.52-1 trips for aG.F. on load bus#1.52-T trips for aG.F. on load bus# 2.

No.

12-1

12-2

12-3

12-4

12-5

O tSupply toPoints

A1 and N1

A2 and N2

A2andN2

A1 andN1

A1 and N1

Expected

Breakers 52-1and 52-Tshould nottrip.Breaker 52-2should nottrip.Breaker 52-2should trip.

52-1should trip.Breaker5 2 . ~should trip.

betweenPoints

A4-N4

A4-N4

A4-N1

A3-N2

A4-N2

BreakersOpen or ClosedDuring the TestDisconnect"OmNeutral atPoints

and G2

G1 and 62

G1 and 6 2

G1 and 62

G1 and 6 2

52-1

o

o

c

c

52-T

c

c

c

c

52-2

c

c

o

o


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Ground Fault Protection With Ground Fault RelaysPERFORMANCE TEST RECORDThis test form should be retained by those in charge of the bu ilding's electrical installationin order to be available to the authority having jurisdiction.

General Electric Orde rIReq uisition No.Customer NameLocationOrder No.

EQUIPMENTC] AV-Line SwitchboardC] PowerBreak SwitchboardC] AKD-6 L.V. Switchgear AKD-8 L.V. Switchgear[7 OtherRating: Volts Phase WireAmps. Hz.

EQUIPMENT ARRANGEMENTC ] Single-sourceC] Double-ended C] Other (explain)

Unit-Substation 1 ransforrner(s) remote from equipment.GROUND FAULT PROTECTION

Breaker (or switch) tripp ed by G.F. relay:Function: Main C] Feeder; Circ uit No.Type C] Drawout C] StationaryRating (Amps): Frame Trip

GROUND FAULT RELAY & ACCESSORIESGround-break System Other (expla in)

Relay Cat. No. Pickup Range (Amps)Sensor (C.T.) Cat. No.Mon itor Panel (if used) Cat. No.

SENSOR ARRANGEMENT: Ground-return TypeResidual (sensor on each phase).

[7 Zero-sequence (all conductors thru on e window).Double-ended: Single-Point Grou nd Scheme Modified-Differential Scheme

Additional De scription (if needed)


18/24

Ground Fault Protection With Ground Fault RelaysPERFORMANCETEST RECORD

TEST RECORD

CONCLUSIONS:The test results are satisfactory.The test results are not satisfactory.

TestNumber

(Explain)

Tests performed by:

Test Set Used:

G.F. RELAY SETTING

Test Date:

TestCurrent(Amps)Pickup(Amps)

Witnessed By:

Delay(Sec.)TRIPPING RESULTS

BkrISw.Trip? Measured TimeFor BkrISw. to Open


19/24

Ground Fault Protection WithIntegral Ground Fault Trips On Circuit BreakerPERFORMANCE TEST RECORDThis test form should be retained by those in charge of the building's electrical installationin order to be available to the authority having urisdiction.

General Electric Order/Requisition No.Customer Name

Order No.EQUIPMENT

AV-Line Switchboard!J PowerBreak Switchboard!J AKD-6 L.V. Switchgear AKD-8 L.V. Switchgear

OtherRating: Volts Phase Wire

Amps. Hz.EQUIPMENT ARRANGEMENT

Single-sourceC] Double-ended Other (explain)C] Unit-substation !J Transformer(s) remote from equipment.

GROUND FAULT PROTECTIONBreaker tripped by integral ground fault trips:

Function: Main Feeder; Circuit No.TYpe Drawout StationaryRating (Amps): Frame SensorITap3-Wire 4-WireTrip Type: lJ SST !J VersaTrip SelecTrip MicroVersaTrip

Additional Description (if needed)


20/24

Ground Fault Protection WithIntegral Ground Fault Trips On Circuit BreakerPERFORMANCETEST RECORD

TEST RECORD

CONCLUSIONS:The test results are satisfactory.The test results are not satisfactory.

TestNumber

-

Tests performed by:

Test Set Used:

Test Date:

GroundPickupin M U , ~ .

O f 2 g r

Witnessed By:

TestCurrent(Amps)Fault Settings

Time DelayBand(minlintlmax) BkrISw.Trip?

Tripping ResultsMeasured TimeFor BkrISw. to Open

i


21/24

Notes


22/24

Notes


23/24

Notes


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For further information General Electriccall or write your local CompanyGeneral Electric 41 Woodford AvenueSales Office or . . . Plainville, CT 06062 U.S.A.

graung fault

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