77th occ minutes
TRANSCRIPT
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No. NERPC/OP/OCC/2012/5 0 0 5 - 3 4 Date: 21stSeptember, 2012
To,1. Managing Director, APDCL, Bijuli Bhawan, Guwahati 781 0012. Managing Director, AEGCL, Bijuli Bhawan, Guwahati 781 0013. Director (Distribution), Me. ECL, Lumjingshai, Short Round Road,Shillong 793 0014. CGM, (LDC), SLDC Complex, AEGCL, Kahelipara, Guwahati-781 019 5. Chief Engineer (WE Zone),Department of Power,Govt. of Arunachal Pradesh,Itanagar- 791 111 6. Engineer-in-Chief (P&E), Department of Power, Govt. of Mizoram, Aizawl 796 0017. Chief Engineer (P), Electricity Department, Govt. of Manipur, Keishampat, Imphal 795 0018. Chief Engineer (P), Department of Power, Govt. of Nagaland, Kohima 797 0019. General Manager, TSECL, Agartala 799 00110.ED (O&M), NERTS, PGCIL, Dongtieh-Lower Nongrah, Lapalang, Shillong -793 00611.ED (O&M), NEEPCO Ltd., Brookland Compound, Lower New Colony, Shillong-793003 12.ED (Commercial), NEEPCO Ltd., Brookland Compound, Lower New Colony, Shillong-79300313.ED (O&M), NHPC, NHPC Office Complex, Sector-33, Faridabad,Haryana-12100314.AGM, NERLDC, Dongtieh-Lower Nongrah, Lapalang, Shillong -793 006 15.DGM (C&M), OTPC, 6thFloor, A-Wing, IFCI Tower -61, Nehru Place, New Delhi - 11001916.Member Secretary, ERPC, 14 Golf Club Road, Tollygunge, Kolkata-70003317.Chief Engineer, GM Division, Central Electricity Authority, New Delhi 110066
Sub: Minutes of the 77thOCC Meeting held on 13thSeptember, 2012 at Guwahati.
The Minutes of the 77thOCC Meeting of NERPC held on 13.09.2012at Hotel GrandStarline, Guwahati is enclosed for favour of kind information and necessary action please .
The minutes is also available on the website of NERPC www.nerpc.nic.in
Encl: As above
/Yours faithfully,
(. /B. Lyngkhoi ) / Superintending Engineer (O)
Copy to:
1.Chief Engineer, AEGCL, Bijuli Bhavan, Guwahati - 7810012.Chief Engineer, APGCL, Bijuli Bhavan, Guwahati - 7810013.S.E. (Trans. & Dist), MeSEB Lumjingshai, Short Round Road,Shillong 793 0014.Head of SLDC, MeSEB, Lumjingshai, Short Round Road,Shillong 793 0015.Head of SLDC, Department of Power,Govt. of Arunachal Pradesh,Itanagar- 791 1116.A.C.E. (Gen & Trans), Department of Power, Govt. of Nagaland, Kohima 797 001
7. Head of SLDC, Department of Power, Dimapur, Nagaland8. A.C.E. (Power-I), Electricity Department, Govt. of Manipur, Keishampat, Imphal 795 0019. Head of SLDC, Electricity Department, Govt. of Manipur, Keishampat, Imphal 795 00110.S.E. (Trans & Dist), Department of Power, Govt. of Mizoram, Aizawl 796 00111.Head of SLDC, Department of Power, Govt. of Mizoram, Aizawl 796 00112.Head of SLDC, TSECL, Agartala 799 00113.Chief Engineer(Elect), Loktak HEP,Vidyut Vihar, Kom Keirap, Manipur- 795124
Government of IndiaMinistry of Power
North Eastern Regional Power Committee
- . Meghalaya State Housing Finance Co-Operative Society Ltd. Building
, 793003Non rim Hills Shillon 793003.
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Ph. No: 0364 - 2520050
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North Eastern Regional Power Committee
MINUTES OF THE 77th
OPERATION COORDINATION SUB-COMMITTEE MEETING
OF NERPC
Date : 13/09/2012 (Thursday)
Time :10:30 hrs
Venue :Hotel Grand Starline, Guwahati.
The List of Participants in the 77thOCC Meeting is attached at Annexure I
The meeting was started with welcome address by Shri A. K. Mishra, Member
Secretary I/C, NERPC. He welcomed all the participants to the 77 thOCC meeting.
He briefed about the power supply position during the month of August, 2012 and
informed that all the grid parameters are within the permissible limits. He also
stated that with the commissioning of Pallatana GBPP the behavior of the NER grid
will become more complex and hence all the constituents should cooperate with
NERLDC for smooth operation of the system. Further, he informed about the
recommendation of Enquiry Committee on Grid Disturbance that occurred on the
30th& 31stJuly, 2012. He requested all the participants to actively participate in
the discussion for fruitful outcome.
Thereafter, Member Secretary I/C requested Shri B. Lyngkhoi, SE(O), NERPC to
take up the agenda items for discussion.
CONFIRMATION OF MINUTES OF 76th MEETING OF OPERATION SUB-COMMITTEE OF NERPC.
SE(O), NERPC mentioned that the minutes of the 76th OCC meeting held on 8th
August, 2012 at Guwahati were circulated vide letter No.
NERPC/OP/OCC/2012/4479-4512 dated 17thAugust, 2012.
A. C O N F I R M A T I O N O F M I N U T E S
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No obse r v a t i o n s or c om men t s we r e r ec ei v ed f r om a ny o f t h e con s t i t u en t s , t h e
m i n u t e s o f 7 6 t hOCC meet i n g w as con f i r m ed .
SE (O), NERPC request ed NERLDC t o g i ve t h e p r esen t a t i on abou t t h e g r i d
p er f o rma n c e o f NER du r i n g t h e mon t h o f A u g u st , 2 0 1 2 .
I T E M S F O R D I S C U S S I O N
B.1 OPERATIONAL PERFORMANCE AND GRID DISCIPLINE DURING AUGUST, 12
As per the data made available by NERLDC, the grid performance parameters for
August, 2012 are given below:
i) Average frequencyduring August, 2012 was 49.95 Hz as compared to 49.70 Hzin July, 2012.
ii) Minimum frequency in August, 2012 was 48.82 Hz (20.08.12 at 10:44 hrs) ascompared to 48.79 Hz recorded in the previous month.
iii) Maximum frequency was 50.65 Hz (02.08.12 at 08:02 hrs), as compared to50.21 Hz in July, 2012.
iv) System frequencyremained within permissible range of 49.5 Hz to 50.2 Hz for90.70 % of the time, below 49.5 Hz for 1.53 % and above 50.2 Hz for 7.77 % of
the time as compared to 74.70 %, 23.32% and 1.98 % respectively in the previous
month.
v) Regional peakdemand in August, 2012 was 1960 MW as compared to 1946 MWin July, 2012, an increase of 0.71 % over the previous month.
vi) Regional peak availability was 1789 MW as compared to 1762 MW in previousmonth, an increase of 1.53 % over the previous month.
vii)Energy requirementwas 1071.17 MUs in August, 2012 compared to 1046.16MUs in July, 2012, an increase of 2.39 % over the previous month.
viii)Regional energy availabilitywas 1004.39 MUs compared to 973.00 MUs in theprevious month, an increase of 3.23 % over the previous month.
ix) Rise in demand met was recorded in Manipur (5.83%), Nagaland (2.78%),Assam (2.19%) & Mizoram (1.98%) over the previous month.
x) Drop in demand met was recorded in Ar. Pradesh (6.15%), Meghalaya (1.32%),& Tripura (0.13%) over the previous month viz. July, 2012.
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xi) Over Voltages at 400 kV substations were observed at Misa and Balipara, wheremaximum voltage observed were 422 and 420 kV respectively. No over voltage at
220 kV S/S was observed.
xii)No over Voltages were observed at 132 kV S/S.xiii)No under Voltages were observed at 400 kV S/S, 220 kV S/S. Under voltage,
observed at 132 kV S/S at Aizawl, was 115 kV.
xiv)Regional Generation & Inter-regional Exchangesduring the month of August,2012 compared to July, 2012 are given below:
SN Parameter August, 2012 July, 2012
REGIONAL GENERATION & INTER REGIONAL EXCHANGES (in MU)
1 Total Generation in NER (Gross) 945.077 944.701
2Total Central Sector Generation (Gross) 604.102 628.115
Total State Sector Generation (Gross) 340.975 316.586
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Inter-Regional Energy Exchanges
(a) NER - ER 13.74 23.60
(b) ER - NER 106.82 85.26
(c) Net Import 93.08 61.66
Th e Sub -comm i t t ee no t ed a s above.
FOLLOW UP ACTION
C.1 Installation of new Under Frequency Relays (UFRs) in NER systems andconstituent-wise quantum of load relief as recommended by the sub-committee:
During 73rd OCC, Manipur representative had informed the work is in progress
and installation of UFRs in Manipur would be completed by May, 2012.
The status could not be updated as Manipur representative was not present. The
Sub-Committee requested NERPC Secretariat to take up the issue with DoP,
Manipur.
During Special Committee meeting Manipur representative had informed that the
UFRs had been procured and the installation work was going on.
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Manipur representatives informed that they want to install UFR in 132 kV Imphal-
Imphal line. NERLDC suggested for choosing radial feeders for the purpose.
Manipur informed that installation work will be completed by September, 2012.
Th e sub -Comm i t t ee no t ed a s above.
C.2 Status of 132 KV Kopili Khandong 2ndCkt:In the 72nd OCC meeting POWERGRID had informed that the job was taken up by
them during the approved shut down period from13.01.2012 to 23.01.2012. But,
on 23.01,2012 a fatal accident had occurred during the stringing of conductor for
which one tension tower before dead end tower got totally damaged. Subsequently
POWERGRID restored the Line # 2 on 23.01.2012 and Line # 1 on 23.01.2012
temporarily on old tower as per the existing arrangement.
POWERGRID had arranged the tower from MeECL and applied shut down during
the period from 23.04.2012 to 04.05.2012 for Line # 1 and from 06.05.2012 to
14.05.2012 for Line # 2 to carry out restoration on permanent basis. The job was
to be completed by 15th May 2012.
During 74th OCC meeting, POWERGRID had informed that they have availed
shutdown from 15.05.12 to 24.05.12 to complete the above work and started
erection of tower. Unfortunately the work had to be postponed due to mismatch of
foundation and the same was to be completed by 20thJuly, 2012.
During the 75th OCC meeting, AGM, NERTS had informed that the work was
postponed due to heavy rain in the area and the same would be completed soon.
During 76th OCC meeting, POWERGRID had again informed that the work was
delayed due to heavy rain at project site, however the work would be completed by
12thAugust, 2012.
CM, POWERGRID informed that the work was completed on 11thAugust, 2012.
Th e Sub -comm i t t ee no t ed a s above.
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C.3 Powermap & Single Line Diagram (SLD) in NER.In the 73rd OCC meeting, NERPC once again requested all Constituents,
particularly SLDCs, to submit the latest / updated Powermap (showing
geographical location, generating stations and interconnecting lines) & SLD of their
state covering 132kV and above voltage level as requested during the 71st
OCCmeeting.
As suggested by the Sub-committee in 74thOCC meeting, NERPC had uploaded
the current single line diagram and powermap of the NER constituents in NERPCs
website. Constituents were requested to download the same form NERPCs website
and do necessary modification/updation, if any.
During 75thOCC meeting, Assam intimated that they have submitted the requisite
information to NERLDC. MS I/C, NERPC stated that the editable soft copy of therespective SLD and Power map will be circulated to all the constituents so that
they can correct/modify the diagrams and submit to NERPC. Further, the
committee decided to follow the CBIP colour coding for the above diagrams.
AGM, POWERGRID stated that the upcoming Sub-stations and lines may be
considered for the compilation of the above diagrams. MS I/C, NERPC welcomed
the suggestion of POWERGRID and requested to provide the necessary details of
new/up-coming projects for incorporation.
Assam intimated that they are getting some difficulties in editing the editable
formats. It was decided that un-grouped editable file of SLDCs and Power map will
be uploaded in the website/sent by e-mail so that the utilities can update their
respective data and Power maps.
A l l t h e con s t i t u en t s ag r eed t o subm i t t h e cor r ec t ed SLDCs and Powe r m ap
t o NERPC a t t h e ea r l i es t .
C.4 Submission of data required for development of Power Atlas of NER & statesof NER
NERLDC had sent letters to power utilities of NER for development of Power Atlas of
NER & states of NER by June, 2012 by NERLDC. The status given by NERLDC in
74thOCC meeting was as under:
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C.5 Status of completion of ongoing Transmission Lines in NER.During the 73rd OCC meeting, NERPC Secretariat had circulated the proforma
regarding the status of various ongoing transmission schemes being
executed/implemented by POWERGRID/States/Other Agencies.
SE(O), NERPC informed that POWERGRID has submitted the above data. He
stressed to other constituents to submit the status of their ongoing transmission
lines. Member Secretary I/C requested the constituents to furnish the details as
per proforma so that the status can be updated to constituents in every OCC
meeting.
All constituents have submitted the data except Mizoram and Manipur. Committee
requested them to submit the data at the earliest.
Man i p u r a n d M i z or am a g r e ed t o f u r n i sh t h e st a t u s .
C.6 Status of Generation Projects in NERDuring the 73rd OCC meeting, NERPC Secretariat had circulated the proforma
regarding the status of Generating units to be commissioned/expected to be
commissioned by Central Utilities/States/Other Agencies.
During 75th OCC meeting, MS I/C stressed all the constituents to submit the
above status as it will help the sub-committee to keep track of various generation
projects and it will help in operation planning also. NEEPCO informed that they
will furnish the data in respect of their projects in the next OCC meeting.
TSECL and NEEPCO had submitted the status of their ongoing generation
projects.Member Secretary I/C requested other constituents to furnish the details
as per proforma so that the status can be updated to constituents in every OCC
meeting.
A l l t h e con s t i t u e n t s a r e r eque st e d t o f u r n i s h a s agenda i t em i n ever y OCC
mee t i n g .
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C.7 Early revival of 3 numbers of 20 MVA Transformers at KopiliAssam observed that right from the time of the commissioning of 160 MVA Auto
transformer of Power Grid at Kopili, the existing 3 numbers of 20 MVA, single phase
transformers supplied by NEEPCO are not in working condition till today.
Therefore, NEEPCO was requested to make necessary arrangement for revival of the
above transformers for strengthening of the grid security at an early date.
The NEEPCO representative had informed that the above said transformers were
not charged since March, 2011.
The committee had suggested NEEPCO to keep the 3X 20 MVA transformers in
charged condition so that it could be connected to grid in case of outage of 160
MVA Autotransformer.
During 75th OCC meeting, NEEPCO stated that after completion of Shutdown of
Kopili-Khandong line, the transformers would be test charged after necessary oil
filtration.
During 76thOCC meeting, NEEPCO had informed that the oil filtration work would
be completed within seven (7) days. Further, the Committee had requested
POWERGRID to study parallel operation of the 3x20 MVA transformers with the
existing Kopili ICT.
NEEPCO informed that the 3x30 MVA Transformers was successfully charged from
220 kV side on 8thSeptember, 2012.
SE (Com), NERPC informed that these transformers should not be kept in charged
condition for long period without load and other possibilities of utilization of these
regional assets should be explored. He also suggested for loading of 3x20MVA
transformer (keeping 160MVA transformer out of circuit) under planned shutdown
condition of one of the D/c line between Kopili and Khandong limiting the line
loading to safe operation limit of transformer.
CM, POWERGRID stated that this transformer can be operated locally in parallel or
it can feed radial load. Further, he informed that the parallel loading of transformer
will only be possible if the percentage impedance of the above transformer bank is
within the permissible limit otherwise it will limit the loading of 160 MVA ICT.
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CM, POWERGRID stated that this transformer can be operated in isolation to feed
radial load. Further, he informed that the parallel loading of transformer is possible
if the percentage impedance of the both transformer bank is within the permissible
limit, otherwise the loading of 160 MVA ICT will be limited.
The Committee inquired from NEEPCO about the percentage impedance of both
transformers. NEEPCO agreed to provide the information in the next OCC meeting.
The Committee agreed and requested POWERGRID to explore for more possibility
for utilizing these transformers as these are regional projects and cannot be kept
idle. It was also decided that possibility will be explored for charging the ICT along
with 132 kV Kopili Khandong ckt-I in the event of shut down of 132 kV Kopili
Khandong ckt-II.
Th e sub -Comm i t t ee no t ed as a bove.
C.8 Running of Pallatana one unit in full capacity for 72 hrsIn the meeting on 24.07.12 OTPC had informed that U-I will be put on commercial
operation in the last week of August, 2012. For this continuous running of the unit
at full capacity(363 MW) will be required for 72 hrs. It was decided that the matter
will be deliberated in next (76th) OCC meeting for finalizing quantum of backing
down required at different stations in 132 kV pocket and acceptance of the utilities
in this regard for finalization of modus operandi.
During 76thOCC meeting, NERLDC presented the detail system study report for 72
hours continuous run Pallatana module-I. The detail study was carried out for two
cases: Off-Peak (03:00 Hours) and Peak (20:00 Hours) based on evacuation of
maximum power up to 350 MW and case study of tripping of Pallatana module.
From the report it was found that during off-peak hours Tripura, AGTPP and
Loktak has to back down their generations.
On telephonic discussion with OTPC during the OCC meeting, it was understood
that Palatana unit-I would start trial run from mid August and about 30-40 MW
will be injected to Grid as Infirm power. Thereafter, 72 hrs full load pre-
commissioning test was expected to be done by mid September. About 363 MW
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continuous load would have to be connected to the Palatana system during such
test by reducing Tripura state generation, AGTPP and LOKTAK generation.
AGM, TSECL stated that beneficiary state would be required to overdraw power as
their drawl scheduled will be reduced to the extent AGTPP and LOKTAK generation
is backed down. In addition Tripura would have to maximize their drawal with
backing down of own State generation. In view of above it was decided to have
separate meeting to study the pre-commissioning test arrangement and
commercial impact of affected utility. Further, it was discussed that with the
commissioning of Palatana project fault level of 132 KV pocket of NER would
substantially go high. Existing protection system and impact of likely fault at
various condition of Palatana operation would have to be studied at Transmission
network and Generating stations connected at 132 KV pocket of both state and
central sector. It was decided that PGCIL would conduct required study and reportwould be placed to next combined OCC and protection committee meeting.
POWERGRID had agreed.
During 76th OCC meeting, the committee expressed concern about the non-
representation of OTPC in the OCC meeting and felt that this issue should be
deliberated in the presence of OTPC representatives in the next OCC meeting.
DGM, OTPC informed that the gas turbine firing has started on 13.09.12 and themachine will be synchronized to the grid on 29th September, 2012 after passing
through various stages of operation as per the manufacturers guidelines. After
synchronization infirm power of about 40 MW (approximately) will be injected into
the grid. Then machine will run on Full Speed No Load (FSNL) for seven (days).
After that steam turbine rolling will start and the module I will come into
operation w.e.f. 29.09.2012. Since there is no bypass arrangement in the modules,
the machine cannot run under open cycle mode. In initial phase, the complete
module will generate around 150-160 MW and slowly generation will ramp upto
363 MW, and ultimately machine has to run continuously under full load for 72
hours to declare COD.
NERLDC gave the detail presentation for evacuation of maximum power from
Pallatana taking into account the surge impedance loading of the line as limitation,
as advised by NLDC after grid disturbance.
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The presentation is enclosed at Annexure C.8. The detail study was carried out for
following scenarios:
1. Evacuation of Maximum power from Pallatana during 0300 Hrs withoutbacking down of other generation
2. Evacuation of 360 MW (Ex-PP) from Pallatana during 0300 Hrs with backingdown of other generation
3. Case study on Reduction of generation of Pallatana from 360 MW during0300 Hrs
4. Case study on tripping of 360 MW (ex-PP) generation at Pallatana GBPPduring 0300 Hrs
5. Evacuation of Maximum power from Pallatana during Peak Hrs withoutbacking down of other generation
6. Evacuation of 360 MW (Ex-PP) from Pallatana during Peak Hrs with backingdown of other generation
7. Case study on Reduction of generation of Pallatana from 360 MW duringPEAK hours
8. Case study on Tripping of Palatana GBPP during Peak Hrs from an initialgeneration of 360 MW)
During the presentation by NERLDC, it was observed that in absence of 400kV
Silchar-Byrnihat line, tripping of machine at Palatana under full load condition
(i.e.363MW), during peak and off peak hours, will have adverse impact on the NER
system leading to overloading of number of lines and ICT at Misa. Further,
NERLDC requested Assam and Meghalaya that 132 kV Panchgram-Lumshnong
line should be ready before the synchronization of the Pallatana Machine on
29/09/12. Assam informed that 90% of Assam portion is ready and the rest will be
completed very soon. MeECL informed that they would communicate the actualprogress after getting information from the site.
AGM, TSECL informed that during trial operation NERLDC should check whether
the 132 kV NER system can sustain generation of 200 MW and more. Further, he
suggested that the machine may be synchronized with grid and during the
operation close co-ordination with NERLDC is required and there should be proper
Load-Generation Stabilization.
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Assam emphasized that the NER system cannot sustain generation of 363 MW
from Palatana without commissioning of 400 kV Silchar-Byrnihat line. So, we have
to wait for commissioning of this line and we should go step by step for
synchronization with the grid with full generation of 363MW. However, OTPC can
generate 200 MW as decided in previous meetings till 400kV Silchar-Byrnihat line
is ready.
POWERGRID informed that the commissioning schedule of 400 kV Silchar
Byrnihat is January, 2013.
CEA representative stated that at present NER system is not strong enough to take
the full generation of OTPC and as per CEA guidelines commercial operation of
machine can be declared only after 72 hours of continuous generation under full
load condition. So, OTPC should wait till the commissioning of 400kV Silchar-
Byrnihat line. The injected power will be infirm power, if COD is not granted.
After detailed deliberation the Committee agreed to allow for synchronization of
Pallatana Machine with ex-bus generation of 200 MW due to system constraint.
After stabilization of machine and proper synchronization with the grid, full loading
upto 360 MW would be considered.
But the representative of OTPC informed that as a technical requirement for trail
run, the machine needs to go upto full load of 363MW and COD cannot be
declared without continuous operation under full load for 72 hours.
Taking into account the prevailing situation and requirement of additional power
in coming Durga Puja, the Committee ultimately agreed with OTPCs proposal to
go for synchronization process and continuous operation under full load for 72
hours required for declaration of COD subject to OPTC provide their detail action
plan to NERLDC well in advance so that necessary planning for backing down of
generation and change in drawl schedule of constituents can be finalized by
NERLDC before hand as the existing transmission system is not healthy to absorb
any abnormality due to tripping of Palatana generating Unit, while running under
full load (363MW).
Th e Sub -comm i t t ee no t ed a s above.
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C.9 SPS scheme for PallatanaIt was observed from load flow studies carried out by NERLDC that tripping of
Pallatana unit during peak hours would cause loading of Kopili ICT (160 MVA). To
save the situation shedding of around 100 MW of load would be required in the
132 KV pocket through SPS.
During 76thOCC meeting, DGM, NERLDC had informed that a special protection
scheme is required to be planned for shedding the above load. The committee
advised NERPC Secretariat to design the SPS in consultation with NERLDC,
Assam, Meghalaya, Tripura, NEEPCO, NHPC and OTPC.
POWERGRID representatives had informed that not only SPS but protection
schemes are also required to be reviewed before commissioning of Pallatana GBPP.
From the load flow study it was observed that in certain lines there will be reverse
flow of power due to tripping of Pallatana.
The committee had requested POWERGRID to study the protection schemes and
prepare a report. The same will be discussed in the next OCC meeting.
DGM, NERLDC stated that in case of tripping of Pallatana unit, around 120 MW
load shedding through SPS would be required in Mizoram, Tripura and South
Assam (each 40 MW) and some load shedding would be required in Meghalaya.
POWERGRID informed that the implementation of SPS for tripping of far off
lines/loads will be difficult as there will be co-ordination problem because of non-
availability of communication links and NERLDC should find some other nearby
lines or SPS can be linked with Kopili ICT. NERLDC informed that they have
identified the list of radial lines (refer Item No. C.10; Annexure C.10) in NER
system for disconnecting during emergency conditions to save the grid. They
pointed out that the SPS can be implemented on those lines which are available in
132 kV Pocket. All the constituents agreed for implementation of SPS on these
lines and also for emergency disconnection of listed lines in case of necessity.
Th e Sub -comm i t t ee no t ed a s above.
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C.10 Implementation of islanding scheme in NERFor survival of different parts/pockets (with identified generation along with some
load) of NER grid in the event of grid disturbance, islanding schemes are required
to be planned properly & implemented.
DGM, NERLDC stated that some islanding schemes need to be planned so that the
islands survive during any grid disturbance so that start-up power can be
extended to other generating stations. The islanding scheme for NER was
discussed in detail for separating of NER system from NEW grid and forming of
islands in NER. Two proposals for islanding scheme were discussed. The
presentations of both the proposals are enclosed at Annexure C.10.1and C.10.2.
In both proposals, first step is isolation of NER from NEW Grid at a particularfrequency by tripping of 400kV D/C line and 220kV D/C line connecting ER and
NER. In one case it has been proposed for formation of two Sustainable Small
System (SSS) and then Unit islanding and ultimately Safe shutdown of Generating
units when frequency falls to different levels. The frequency level at which actions
are to be initiated is to be finalized after discussion.
The Committee requested all the constituents to study the islanding schemes and
communicate their comments/suggestions at the earliest so that the islanding
scheme for NER can be finalized.
Further, DGM, NERLDC informed that the list of radial lines in NER system, which
can be tripped during emergency to save the grid, have been identified. During
emergency there may not be time to co-ordinate with SLDC (like written message
etc.) before taking such action. However, formal communication shall be made by
NERLDC afterwards. The list of radial lines identified for above purpose along with
the load relief is enclosed at Annexure C.10.
All constituents agreed to co-operate with NERLDC during emergency.
Th e Sub -comm i t t ee no t ed a s above.
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C.11 UFR Relay OperationInformation regarding UFR operation at the time (13:00 hrs) of NR-ER-NER
disturbance on 31st August, 2012 was requested from the Utilities. Except Tripura
no other utility had furnished the same.
NERLDC informed that all constituents have submitted the required information
Th e Sub -comm i t t ee no t ed a s above.
C.12 Switching Schemes:
During 76thOCC meeting, DGM, NERLDC requested all the utilities to submit their
switching schemes to NERLDC along with a copy to NERPC.
A l l c o n st i t u e n t s a g r e ed t o f u r n i s h t h ei r sw i t c h i n g s ch eme.
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D. N E W I T E M S
D.1 Proforma for Operational Statistics -NERPCThe operational Statistics as given below was not furnished in the meeting.
(i) Schedule Vs Actual Generation.
(ii) Peak Demand: Schedule Vs Actual.
(iii) Integrated Operation of the system.
(iv) Details of DC, schedules and injections from Central sector stations, drawalschedules and entitlements of constituents.
(v) Details of major reservoirs in NER.
Th e oper a t i o n a l s t a t i c s wer e shown i n t h e p r es en t a t i o n b y NERLDC.
Th e Sub -comm i t t ee no t ed a s above.
D.2 State-wise anticipated peak demand/requirement, shortage for September,October, November December- 2012 & January- 2013.
Th e s u b-Comm i t t ee r evi ew e d & f i n a l i z ed t h e a n t i c i p a t e d p ea k
demand / e ne r g y r e qu i r emen t / A v a i l a b i l i t y f o r t h e mon t h s o f Sep t embe r ,
Oc t o ber , Novem ber , Decembe r - 20 12 & Ja nu a r y -2 0 13 .
A. Peak Demand
S.No. State
Peak
Demand
(MW)
Sep 12
Peak
Demand
(MW)
Oct 12
Peak
Demand
(MW)
Nov 12
Peak
Demand
(MW)
Dec 12
Peak
Demand
(MW)
Jan 13
1 Ar. Pradesh 110 110 100 100 105
2 Assam 1100 1150 1150 1175 12003 Manipur 105 110 100 100 105
4 Meghalaya 265 270 280 280 280
5 Mizoram 70 75 75 75 75
6 Nagaland 110 110 100 100 110
7 Tripura 230 250 240 240 240
Region 1990 2075 2045 2070 2115
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already written a letter to Mizoram and Meghalaya with a copy to NERPC for
additional Power like previous years and has also requested NERLDC for
necessary arrangement to meet the power demand of about 250 MW during
Puja.
AGM, TSECL informed that during Durga Puja Tripura requires 250 MW load.
He requested the other constituent States and NERLDC to help by providing
additional power during Durga Puja time to meet their load requirement.
Mizoram stated that they are waiting for approval from their Power Department.
NERLDC presented the case studies pertaining to drawal of Tripura (without
considering Pallatana generation) during Durga Puja which is enclosed at
Annexure D.3.2. NERLDC also informed that in real time it may not be possible
to provide the extra quantum of power, purchased from Meghalaya, to Tripura
due to system constraint. All constituents Assam, Meghalaya, Mizoram and
Manipur agreed to support Tripura during Durga Puja. It was also decided to
review the scenario in the next OCC after commissioning of Pallatana Unit.
Th e Sub -comm i t t ee no t ed a s above.
3) Voice & Data communication including SCADA monitoring for real timeoperation in respect of Palatana project & its associated Transmission
system and its current status.
OTPC informed that the voice and data communication is ready upto Silchar
POWERGRID informed that they have received only one modem and second one
is yet to be received from OTPC. Further, they informed that the voice and data
communication link up to Silchar is complete and within a week remaining work
up to NERLDC, Shillong will be completed.
NERLDC informed that the communication system is to be established as per
the system requirement before the synchronization of Pallatana unit.
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On enquiry by OTPC regarding data communication link in Tripura part,
POWERGRID informed that communication link from Pallatana to
Surajmaninagar and Udaipur will be done by POWERGRID and communication
link from Surajmaninagar and Udaipur to Tripura SLDC will be done by TSECL.
The Committee advised OTPC to resolve the matter of the communication system
with POWERGRID and Tripura before commissioning of the Units.
Th e Sub -comm i t t ee no t ed a s above.
4)TSECL informed that the website of NERPC is not functioning properly as theyfound difficulty in downloading the REA, Meeting notice/minutes etc. on time.
The previous data are also not available.
SE (Com), NERPC clarified that the new website has been developed by NIC and
NERPC is also trying to upload the old data for the benefit of constituents. The
minutes of OCC, PCC & NERPC meetings, UI and REA data for last one year has
already been uploaded in new website. He assured constituents to take
necessary action for improvement in website and based on the feedback, the
matter will be taken up with NIC for further improvement.
Th e Sub -comm i t t ee no t ed a s above.
D.4 Recommendations of Enquiry Committee on Grid Disturbance
After the major grid disturbance on 30th and 31st July, 2012, the enquiry
committee constituted under the Chairmanship of Shri A.S. Bakshi, Chairperson,CEA had submitted the report to Ministry of Power on 16th of August, 2012 and
report has been made available on website of Ministry of Power, Govt. of India
(www.powermin.nic.in).
As per the report the following recommendations are required to be implemented
by the NER constituents:
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1) Review of Protection Systems
i. There is a need to review protection schemes. This Committee concurs withrecommendation of previous enquiry committees that a thorough third party
protection audit need to be carried out in time bound manner. This exercise
should be repeated periodically and monitored by RPCs.
ii. Till protection audit is taken up, there is need to take immediate review ofzone-3 philosophy in particular. Techniques are available to modify
characteristics of the relay so that it can distinguish between load
encroachment and faults. These techniques and other alternatives should be
explored immediately.
iii. The application of synchrophasor measurements from PMUs should beexplored for protection systems. There is also an urgent need to deploy Special
Protection System (SPS) in critical transmission elements. Also there is need
to make already approved SPS operational
iv. A complete independent audit of time synchronization of DRs, ELs and PMUsshould be carried out
2) Ensuring proper functioning of defense mechanism
All STUs should immediately enable under frequency and df/dt based load
shedding schemes. Central Commission should explore ways and means for
implementation of various regulations issued under the Electricity Act, 2003. Any
violation of these regulations can prove to be costly as has been the case this time.
RPCs need to take up the matter for compliance. In case non-compliance persists,
POSOCO should approach Central Commission.
3) Coordinated outage planning of transmission elements
Outage planning of inter-State and inter-regional transmission elements should be
carried out in a coordinated manner at RPC fora (say Operation Co-ordination sub-
committee of RPCs) in accordance with regulation 5 of Central Electricity Authority
(Grid Standards) Regulation, 2010 and Section 5.7.1 of Indian Electricity Grid
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Code. In case need for emergency maintenance arises in between two meeting of
Operation Co-ordination sub-committee, NLDC and RLDCs should allow such
maintenance after carefully looking at prevailing system conditions under
intimation to RPC Secretariat.
4) Reactive power planning
In order to avoid frequent outages/opening of lines under over voltages and also
providing voltage support under steady state and dynamic conditions, installation
of adequate static and dynamic reactive power compensators should be planned.
5) Optimum utilization of available assets
i. An audit of devices such as HVDC, TCSC, SVC and PSS should be doneimmediately to ensure that their stability features are enabled. Further,
exercise of PSS tuning should be planned and implemented. Settings of these
dynamic stabilizing devices should be reviewed at appropriate intervals.
ii. Functioning of existing PMUs and availability of their output to RLDCs andaccuracy of time synchronization should be monitored on daily basis and, if
required, corrective actions should be taken on priority basis.
iii. Possibility of voltage collapse prediction, sensing global power systemconditions derived from local measurements may be explored
6) Deployments of WAMS
The synchrophasor based WAMS employing PMUs offer a wide applications for real
time monitoring and control of the system, specially under the dynamic conditions.
Adequate number of PMUs should be installed to improve the visibility and real
time monitoring of the system. Further the applications related to the
synchrophasor based wide area monitoring, protection and control should be
embedded in the system.
Possibility of voltage collapse prediction, sensing global power system conditions
derived from local measurements may be explored.
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7) Implementation of islanding schemesEfforts should be made to design islanding scheme based on frequency sensing
relays so that in case of imminent grid failure, electrical islands can be formed.
These electrical islands can not only help in maintaining supply to essential
services but would also help in faster restoration of grid
8) Autonomy to Load Despatch CentresAs National Grid is on the horizon, homogenization of system operation philosophy
is need of the hour. The present organizational set up of Load Despatch Centres
need to be reviewed. System operation needs to be entrusted to Independent
System Operator (ISO). In addition, SLDCs should be reinforced and ring fenced for
ensuring functional autonomy.
Training and certification of system operators need to be given focused attention.
Sufficient financial incentives need to be given to certified system operators so that
system operation gets recognized as specialized activity.
9) Development of Intra-State transmission systemIntra-State transmission system needs to be planned and strengthened in a better
way to avoid problems of frequent congestion
10) Network visualizationThe Communication network should be strengthened by putting fibre optic
communication system. Further, the Communication network should be
maintained properly to ensure reliability of data at Load Despatch Cenres.
RTUs and communication equipments should have uninterrupted power supply
with proper battery backup so that in case of total power failure, supervisory
control and data acquisition channels do not fail.
In case of existing generating stations or transmission elements without telemetry
facility, the same should be put in place at the earliest. If prolonged operation
without telemetry continues, POSOCO should approach Central Commission.
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11) Reduction in Start-up time for GeneratorsAt inter-State level, the entire landscape has changed over past few years. With de-
licensing of generation and provision of open access in Electricity Act, 2003 and
development of organized electricity markets, lot of generation is coming in the
form of merchant generation. Four out of the five regions have been integrated and
formation of National Grid is on the horizon. Under such scenario, there is need
review the Transmission Planning criteria.
12) Strengthening of system study groups in various power sector organizationsThere is need to reinforce system study groups in power sector organisations to
analyse the system behaviour under different network status/ tripping of
lines/outage of generators. Where these do not exist, these should be created.
13) Improved telecom infrastructure for cyber securityFor smoothen operation of grid systems, it is absolutely important that all the
power generating and distributing stations are connected on a very reliable telecom
network.
i) A proper network may be built up preferably using MPLS (Multi ProtocolLevel Switching) which is simple, cost effective and reliable. In remote places
were connectivity is a problem, the stations can use dedicated fibre cable
from the nearest node.
ii) Since POWERGRID has its own fibre optic cables, practically covering allmajor nodes and generating stations, a proper communication/IT network
may be built using dedicated fibres to avoid any cyber attack on the power
system.
Th e Sub -comm i t t ee no t ed a s above.
D.5 Submission of monthly generation data wrt Renewable Energy SourcesAs per Section 73(i) & (j) of Electricity Act, 2003, OPM Division of CEA has been
entrusted with the task of collecting and recording electricity generation data and
also bring out the reports from time to time. Till date CEA was monitoring all the
existing generating Stations (conventional sources only) with capacity more than
25 MW.
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Recent years have shown appreciable growth in Renewable Energy Sources (RES).
As on 31.03.2012 the RES capacity was 24503 MW with a percentage share of
12.26 % wrt the total generating capacity. This is likely to increase to 22.71 % by
31.03.2017. Due to this growth the impact of RES generation on the generation
from conventional energy sources is increasing. Because of above, the contribution
from RES cannot be ignored.
In view of the above, Member (GO&D), CEA had discussed with the representatives
of various SLDCs, POSOCO and RPCs on 28th June, 2012 in CEA to understand
the existing procedure of collection of generation data in respect of Renewable
Energy Sources (RES) and also to expedite the process for regular submission of
monthly information to CEA.
SLDCs are requested to ensure that the complete information in respect of all the
generators covered under RES is furnished to CEA in the Performa at Annexure
D.5.
Shri Ghanshyam Prasad, Director, CEA gave the detail presentation on generation
data management in respect of Renewable Energy Sources; the hand out of
presentation is enclosed at Annexure D.5.1. He further requested that each SLDC
should nominate a nodal officer. The details of nodal officer i.e. Name, Designation,
Contact no., Email ID etc. should be communicated to CEA at the earliest at the
following email/fax.
Fax no.- 011-26107416, 011-26732662
Email : [email protected]. [email protected], [email protected]
with copy to [email protected]
Nodal officers from CEA are :
Shri Ghanshyam Prasad, Director, CEA, 011-26732653 and 26108191,
M-9968301928, and Mrs Sarita Sewak, Dy. Director, 011-26732647.
Th e Sub -comm i t t ee no t ed a s above.
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D.6 Generation Planning (ongoing and planned outages)
The daily availability for hydro stations as given in the meeting is given below.
Khandong 0.708 MU
Kopilli 3.552 MU
Ranganadi - (subject to inflow)Doyang 1.632 MU
Loktak - 2.52 MU
The shutdown proposal approved by the committee is enclosed at Annexure D.6.
Th e Sub -comm i t t ee no t ed a s above.
D.7 Outage Planning Transmission elementsAfter detail discussion the sub-committee approved the shutdown proposal for Sep
/Oct, 2012 as given in Annexure D.7.
SE (O), NERPC stated that the shutdown proposals of inter regional links should
be planned one month in advance to co-ordinate with the other region as the OCC
meetings of other regions are held on different dates.
Th e Sub -comm i t t ee no t ed a s above.
D.8 Estimated Transmission Availability Certificate (TAC) for the month ofAugust, 2012.
The Estimated Transmission/System Availability for the month of August, 2012
furnished by PGCIL is 99.9101% as per details at Annexure D. 8. NER
constituents were requested to give their comments and observations, if any, by
September, 2012 so that Final TAC for the month of August, 2012 can be issued.
Th e sub -Comm i t t ee no t ed as a bove.
D.9 Major grid disturbances in the previous month (August, 2012 )As intimated by NERLDC, there was no major grid disturbance during the month
of August, 2012.
Th e sub -Comm i t t ee no t ed as a bove.
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D.10 Agenda items by NERLDC1) Requisition based scheduling: In the aftermath of the twin major disturbances
recently, deviations from schedules (over drawal/under drawal, under injection/over
injection) have to be discouraged to enhance the system security and also to avoid
any congestion to neighboring region. Hence preparation of schedules based on 15
minutes block requisition is proposed to be implemented/revived in a time bound
manner.
NERLDC informed that NE Region covers typical hilly terrain and the demand
changes due to frequent change in weather conditions. Therefore, requisition based
scheduling will be beneficial to constituents. All constituents agreed to go for
requisition based scheduling.
The Committee agreed to finalize the requisition based scheduling in next OCC
meeting.
Th e sub -Comm i t t ee no t ed as a bove.
2) Commissioning schedule of Pallatana Units: The date of commissioning furnishedearlier for the first unit is already gone; OTPC may please furnish the new
commissioning schedule along with initial level of generation for proper planning of
operation and optimum dispatch.
The issue has been discussed in detailed under Item No. C.8 above.
3) Telemetry/Voice communication for Pallatana: Commissioning of Pallatana unitsare expected shortly. OTPC has to ensure Telemetry/Voice communication with
NERLDC which is still not in position though it was committed by OTPC in various
forums to have the same in position before starting of generation. NERLDC may be
constrained not to give dispatch clearance in absence of Telemetry/Voice
communication as the security of the grid is at stake.
The issue has been discussed in detailed under Item No D.3.3 above.
4) Ensuring FGMO/RGMO, AVR & PSS tuning(wherever available) for operation ofunits: In line with IEGC & other regulations the following aspects may be ensured
while operation of generating units :
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i.Operation of generators under Free Governor Mode of Operation (FGMO) or
Restricted Governor Mode of Operation (RGMO).
ii.Operation of Generating Units within capability limits as per Capability Curves.
iii.Proper settings of Automatic Voltage Regulator (AVR) and
iv.Proper tuning of Power System Stabilizers.
All constituents agreed to submit the data.
5) Status of Strengthening of 132 kV Panchgram- Lumshnong- Khleihriat(Me)link: In the earlier OCC meetings, the matter was discussed in connection with
secured grid operation vis a vis outage of parallel links and also for enhanced
evacuation of Pallatana generation. Status of strengthening in both Assam &
Meghalaya portion may please be intimated along with likely completion time.
The issue has been discussed in detailed under Item No. C.8 above.
6) Submission of Periodic data by power utilities of NER: Formats for submission ofperiodic data by NER utilities are now available at NERLDC website (www.nerldc.org;
Downloads > NERLDC Formats). All concerned Utilities of NER are requested to
furnish these data periodically in time.
All constituents agreed to submit the data.
7) Submission of Machine Data for Dynamic Simulation as per format circulatedearlier( now available at NERLDC website also) required for system study fordesigning Islanding Scheme:The matter of furnishing of Machine Data had beencommunicated to all constituents vide letter nos. NERLDC/SO-II/5892 dtd. 28-12-
11 and NERLDC/SO-II/9958-68 dtd. 26-03-12 and was also raised in 69th OCC
meeting of NER and discussed in subsequent OCC meetings. In the 75th OCC
meeting it was decided that in case actual data is not available, confirmation
regarding not availability of information is to be given and only the type of
equipment (i.e. type of Generator/Exciter/Governor/ PSS) is to be furnished by Sept
2012.
All constituents agreed to submit the data.
D.11 Date & Venue of next OCC meetingIt is proposed to hold the 78thOCC meeting of NERPC on 5thOctober, 2012 (Friday).
The exact date and venue will be intimated accordingly.
The meeting ended with thanks to the Chair.
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Annexure-I
List of Participants in the 77thOCC meeting held on 13/09/2012
SN Name & Designation Organization Contact No.
1. Sh. Tarik Mize, EE, SLDC Ar. Pradesh 09436059758
2. Sh. N .C. Das, CGM, SLDC Assam 09435559447
3. Sh. P.K. Sarma, DGM, SLDC Assam 09435344083
4. Sh. M.K. Adhikari, DGM, Comml Assam 09864049287
5. Sh. H. K. M. Baruah, DGM Assam 09954709475
6. Sh. J. K. Baishya, AGM, SLDC Assam 09954055295
7. Smt. L. Bhuyan, AGM Assam 09954055295
8. Sh. K. Goswami, AGM (Comml) Assam 09864020019
9. Sh. J.P. Choudhury, AGM, Comml Assam 09864049287
10. Sh. Sanjeev Goswami, OSD to MoP Assam 09864035095
11. Sh. M. Budha C Sharma, EE Manipur 09463060911
12. Sh. F. E. Kharshiing, EE, SLDC Meghalaya 09863066960
13. Sh. D.J. Lyngdoh, AEE, SLDC Meghalaya 09863063375
14. Sh. Lalnunsanga, AE, SLDC Mizoram 09436144651
15. Sh. Kasho Chishi, EE, (Tran) Nagaland 09436005430
16. Sh. S.I. Asangba Tikhir, AE Nagaland 08974363552
17. Sh. M. Debbarma, AGM (C&SO) Tripura 09436120134
18. Sh. Bikram Debbarma, DGM, SO Tripura 09436450501
19. Sh. Debrata Paul, Sr. Mgr. (C&SO) Tripura 09436500244
20. Sh. Nilanjoy Reang, Sr. Mgr
21. Sh. N.R.Paul, DGM NERLDC 09436302723
22. Sh. Anupam Kumar, Engineer. NERLDC 09436335379
23. Sh. H. Talukdar, Manager (OS) NERTS 09436335237
24. Sh. B. K. Chakravarty, DGM (E) NEEPCO 09436309730
25. Sh. B. Goswami, Sr. Mgr. (O&M) NEEPCO 09436163983
26. Sh. Y. Surjamani Singh, Sr. Mgr.(E) NHPC 09436894857
27. Sh. P. Kanungo, DGM (OS) NERTS 09436302823
28. Sh. A.K. Sharma, Manager (OS) NERPS 09436335241
29. Sh. Shree Narayan, DGM (C&M) OTPC 09968194963
30. Sh. Aroop Sarmah, DGM (Comml) OTPC 09436304964
31. Sh. S. Datta, Sr. Mgr OTPC 09436368209
32. Sh. Ghanshyam Prasad, Director CEA 09968301928
33. Sh. A.K. Mishra, Member Secretary I/C NERPC 09402134275
34. Sh. S.K. Ray Mohapatra, SE (Comml) NERPC
35. Sh.B. Lyngkhoi, SE (O) NERPC 09436163419
36 Sh D K Bauri EE NERPC 09863317236