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Transcript of 75th OCC Minutes Final Website
No. NERPC/OP/OCC/2012/ 1290-1322 Date: 18th July, 2012
To,
1. Managing Director, AEGCL, Bijuli Bhawan, Guwahati – 781 001 2. Director (Distribution), Me. ECL, Lumjingshai, Short Round Road,Shillong – 793 001 3. CGM, (LDC), SLDC Complex, AEGCL, Kahelipara, Guwahati-781 019 4. Chief Engineer (WE Zone),Department of Power,Govt. of Arunachal Pradesh,Itanagar- 791 111 5. Chief Engineer (EE Zone),Department of Power,Govt. of Arunachal Pradesh,Itanagar- 791 111 6. Engineer-in-Chief (P&E), Department of Power, Govt. of Mizoram, Aizawl – 796 001 7. Chief Engineer (P), Electricity Department, Govt. of Manipur, Keishampat, Imphal – 795 001 8. Chief Engineer (P), Department of Power, Govt. of Nagaland, Kohima – 797 001 9. General Manager, TSECL, Agartala – 799 001 10. ED (O&M), NERTS, PGCIL, Dongtieh-Lower Nongrah, Lapalang, Shillong -793 006 11. ED (O&M), NEEPCO Ltd., Brookland Compound, Lower New Colony, Shillong-793003 12. ED (Commercial), NEEPCO Ltd., Brookland Compound, Lower New Colony, Shillong-793003 13. ED (O&M), NHPC, NHPC Office Complex, Sector-33, Faridabad,Haryana-121003 14. ED (Commercial), NHPC, NHPC Office Complex, Sector-33, Faridabad,Haryana-121003 15. AGM, NERLDC, Dongtieh-Lower Nongrah, Lapalang, Shillong -793 006 16. Member Secretary, ERPC, 14 Golf Club Road, Tollygunge, Kolkata-700033 17. Chief Engineer, GM Division, Central Electricity Authority, New Delhi – 110066
Sub: Minutes of the 75th OCC Meeting held on 6th July, 2012 at Guwahati.
The Minutes of the 75th OCC Meeting of NERPC held on 06.07.2012 at “Hotel Brahmaputra Ashok”, Guwahati is enclosed for kind information and necessary action please.
The minutes is also available on the website of NERPC www.nerpc.nic.in
¼ãÌãªãè¾ã / Yours faithfully,
Encl: As above
(ºããè. ãäÊãâØãŒããñƒÃ /B. Lyngkhoi ) ‚ã£ããèàã¥ã ‚ããä¼ã¾ãâ¦ãã / Superintending Engineer (O)
Copy to:
1. Chief Engineer, AEGCL, Bijuli Bhavan, Guwahati - 781001 2. Chief Engineer, APGCL, Bijuli Bhavan, Guwahati - 781001 3. MD, CA DISCOM, Bijuli Bhavan, Guwahati - 781001 4. MD, UA DISCOM, Bijuli Bhavan, Guwahati - 781001 5. MD, LA DISCOM, Bijuli Bhavan, Guwahati - 781001 6. S.E. (Trans. & Dist), MeSEB Lumjingshai, Short Round Road,Shillong – 793 001 7. Head of SLDC, MeSEB, Lumjingshai, Short Round Road,Shillong – 793 001 8. Head of SLDC, Department of Power,Govt. of Arunachal Pradesh,Itanagar- 791 111 9. A.C.E. (Gen & Trans), Department of Power, Govt. of Nagaland, Kohima – 797 001
10. Head of SLDC, Department of Power, Dimapur, Nagaland 11. A.C.E. (Power-I), Electricity Department, Govt. of Manipur, Keishampat, Imphal – 795 001 12. Head of SLDC, Electricity Department, Govt. of Manipur, Keishampat, Imphal – 795 001 13. S.E. (Trans & Dist), Department of Power, Govt. of Mizoram, Aizawl – 796 001 14. Head of SLDC, Department of Power, Govt. of Mizoram, Aizawl – 796 001 15. Head of SLDC, TSECL, Agartala – 799 001 16. Chief Engineer(Elect), Loktak HEP,Vidyut Vihar, Kom Keirap, Manipur- 795124
¼ããÀ¦ã ÔãÀ‡ãŠãÀ Government of India ãäÌã²ãì¦ã ½ãâ̈ ããÊã¾ã Ministry of Power
„§ãÀ ¹ãîÌããê àãñ¨ããè¾ã ãäÌã²ãì¦ã Ôããä½ããä¦ã North Eastern Regional Power Committee
½ãñÜããÊã¾ãã Ô›ñ› Öã„ãäÔãØãâ ãä¹ãŠ¶ããâÔã ‡ãŠãñ- ‚ãã¹ãÀñãä›Ìã ÔããñÔãã¾ã›ãè ãäÊã. ãäºããäÊ¡Øãâ Meghalaya State Housing Finance Co-Operative Society Ltd.
Building ¶ããâãäØãƽã ãäÖÊÔã, ãäÍãÊããñâØã – 793003
Nongrim Hills, Shillong – 793003.
Ph. No 0364 -2520050 Fax No : 0364 – 2520030
ISO 9001:2008
North Eastern Regional Power Committee
MINUTES OF THE 75th OPERATION COORDINATION SUB-COMMITTEE MEETING
OF NERPC
Date : 06/07/2012 (Friday)
Time : 10:30 hrs
Venue : “Hotel Brahmaputra Ashok,” Guwahati.
The List of Participants in the 75th OCC Meeting is attached at Annexure – I
The meeting was started with welcome address by Shri Kamal Bhuyan, AGM,
POWERGRID. He welcomed all the participants to the 75th OCC meeting and stated
that POWERGRID is honoured to host the 75th OCC meeting of NERPC in the
Guwahati. Shri Bhuyan briefed about the NER transmission system and mentioned
that they are working very hard to maintain the lines in hilly terrain of NER and
especially during Rainy season. He informed that the 132 kV Haflong-Jiribam line
was very critical due to landslide but the tower was now successfully shifted from
this area and the line is in stable condition. Further, he stated that POWERGRID
may require to re-locate some towers of 132 kV Ranganadi-Nirjuli and 132 kV
Ranganadi-Ziro lines due to road widening by Govt. of Ar. Pradesh. He requested all
the participants to take part in the discussion to come to a fruitful outcome of the
meeting. He then requested Member Secretary I/C, NERPC to proceed with the
meeting.
Shri A.K. Mishra, Member Secretary I/C, NERPC welcomed all the participants to
the 75th OCC meeting and appreciated POWERGRID for making nice arrangement
at a very short notice for hosting the meeting. He briefed about Power scenario of
NER and stated that the situation during last month was very difficult & testing
time for all specially because of shutdowns in the 132 kV pocket. He requested all
the constituents to actively participate in the meeting.
Thereafter, Member Secretary I/C requested Shri B. Lyngkhoi, SE(O), NERPC to
take up the agenda items for discussion.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
2
CONFIRMATION OF MINUTES OF 74th MEETING OF OPERATION SUB-COMMITTEE OF NERPC.
SE(O), NERPC mentioned that the minutes of the 74th OCC meeting held on 8th
June, 2012 at Guwahati were circulated vide letter No.
NERPC/OP/OCC/2012/3625-717 dated 15th June, 2012.
No observations or comments were received from any of the constituents, the minutes of 74th OCC meeting was confirmed.
SE(O), NERPC requested NERLDC to give the presentation about the grid performance of NER during the month of June, 2012.
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 JUNE’, 12 The grid performance parameters for the month of June, 2012 as presented by
NERLDC during the meeting are given below:
i) Average frequency during June, 2012 was 49.70 Hz, as compared to 49.76 Hz in
May, 2012.
ii) Minimum frequency in June, 2012 was 48.75 Hz (12.06.12 at 11:04 hrs) as
compared to 49.82 Hz recorded in the previous month.
iii) Maximum frequency was 50.68 Hz (03.06.12 at 18:04 hrs), as compared to
50.75 Hz in May, 2012.
iv) System frequency remained within permissible range of 49.5 Hz to 50.2 Hz for
78.81 % of the time, below 49.5 Hz for 19.46 % and above 50.2 Hz for 1.73% of
the time as compared to 88.14 %, 10.56% and 1.30 % respectively in the previous
month.
A. C O N F I R M A T I O N O F M I N U T E S
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
3
v) Regional peak demand in June, 2012 was 1988 MW as compared to 1851 MW in
May, 2012, an increase of 7.37 % over the previous month.
vi) Energy requirement was 958.23 MUs in June, 2012 compared to 906.13 MUs in
May, 2012, an increase of 5.75 % over the previous month.
vii) Regional energy availability in June, 2012 was 883.49 MUs compared to
807.21 MUs in the previous month, an increase of 9.45 % over the previous
month.
viii) Rise in demand met was recorded in Ar. Pradesh (16.22%), Nagaland (10.47%),
Manipur (5.56%) & Meghalaya (4.69%) over the previous month.
ix) Drop in demand met was recorded in Assam (3.71%), Mizoram (3.13%), &
Tripura (2.19%) over the previous month viz. May, 2012.
x) Over Voltages at 400 kV substations were observed at Misa and Balipara, where
maximum voltage observed were 426 and 423 kV respectively. No over voltage at
220 kV S/S was observed.
xi) No over Voltages were observed at 132 kV S/S.
xii) 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 118 kV. xiii) Regional Generation & Inter-regional Exchanges during the month of June,
2012 compared to May, 2012 are given below:
SN Parameter June, 2012 May, 2012
REGIONAL GENERATION & INTER – REGIONAL EXCHANGES (in MU)
1 Total Generation in NER (Gross) 802.044 583.965
2 Total Central Sector Generation in NER (Gross) 540.683 333.629
3 Inter-Regional Energy Exchanges
(a) NER - ER 16.03 1.54 (b) ER - NER 124.72 232.68
(c) Net Import 108.69 231.14
The Sub-committee noted as above.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
4
FOLLOW UP ACTION
C.1 Installation of new Under Frequency Relays (UFRs) in NER systems and constituent-wise quantum of load relief as recommended by the sub-committee:
During 73rd OCC, Manipur representative 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 noted as above.
C.2 Feasibility Report for 132 KV Ranganadi – Nirjuli Line:
POWERGRID informed that their SEF and Engineering Department have examined
the proposal and suggested to construct new circuit as neither reconductoring of
existing circuit nor converting existing single circuit line to double circuit is
feasible. Further, POWERGRID informed that they have already carried out the
walkover survey and report is submitted for internal approval.
During 74th OCC meeting, SE(O), NERPC informed that DoP, Ar. Pradesh is
constructing a new 132 kV, D/C Ranganadi-Itanagar line which will solve the
above issue. The status could not be updated as Ar. Pradesh representatives were
not present.
POWERGRID informed that the report for separate corridor for new 132 kV, D/C
line is under preparation and will shortly submitted to CEA for approval.
The Sub-committee noted as above.
C.3 Status of 132 KV Kopili – Khandong 2nd Ckt:
In the 72nd OCC meeting POWERGRID 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.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
5
Meanwhile, POWERGRID has already 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 proposed shut down has already been approved in 72nd OCC and thus, the
job is expected to be completed by 15th May 2012.
During 74th OCC meeting, POWERGRID 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 has to be postponed due to mismatch of foundation
and the same will be completed by 20th July, 2012.
During the 75th OCC meeting, AGM, NERTS informed that the work is getting
postponed due to heavy rain in the area and the same will be completed soon.
The Sub-committee noted as above.
C.4 Implementation of Single-Phase Auto-Reclosure (SPAR) scheme for Transmission Lines:
The OCC Sub-committee reviewed the issue pertaining to SPAR and the status as
indicated during the 75th OCC meeting are given below:
SN Name of the Line Ownership Status as given on 75th OCC meeting.
1 220kV Kopili - Misa # I & II KHEP, NEEPCO Dec, 2012
2 220kV Salakati – BTPS - I & II BTPS, AEGCL Ckt#I- Dec, 2012;
Ckt #II- Completed
3 220kV Balipara – Samaguri Samaguri, AEGCL Dec, 2012
4 132kV Khandong – Haflong KHEP, NEEPCO
Dec, 2012 5 132kV Khandong – Kopili KHEP, NEEPCO
The Sub-committee noted as above.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
6
C.5 Restoration of LILO of 132 KV Dimapur (Nagaland) – Kohima (Nagaland) line at 220/132 KV Dimapur (PG) S/S.
During 73rd OCC, EE, Dept. of Power, Nagaland informed that he would take up
the matter with competent authority so that POWERGRID would be able to
complete the LILO work at the earliest. During the meeting representative from
Dept. of Power, Manipur had given their consent to extend power supply from the
132 KV Karong - Kohima during the commissioning of LILO work at Dimapur
S/stn of POWERGRID.
POWERGRID informed that DoP, Nagaland has not yet given the consent for the
above work. Status could not be updated as Nagaland representatives were not
present. MS I/C, NERPC stated that NERPC will take up the issue with DoP,
Nagaland to restore the LILO at the earliest.
The Committee noted as above.
C.6 VSAT Communication:
During 73rd OCC meeting, AGM, NERLDC informed that VSAT commissioning has
not been accepted by them since the equipment supplied by vendor are not as per
specification. Further, he informed that they have asked them to carry out the
work as per specification or else the contract would be terminated and they would
seek other vendors to carry out the same work.
During 74th OCC meeting, NERLDC stated that the vendor is trying to establish the
links. The status will be intimated in next OCC meeting.
DGM, NERLDC informed that the vendor has failed to establish the connections, so
they are considering for cancellation of the tender. Further, he mentioned that the
cancellation procedure and re-tendering for VSAT communication will take at least
one year. SE (O), NERPC stated that the four States of NER are not having SLDCs
and for them VSAT is the only reliable communication system. The committee
requested NERLDC to complete the above communication links as early as
possible for better communication and co-ordination.
The Committee noted as above.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
7
C.7 Data required by NERLDC:
During 74th OCC meeting, the sub-committee requested all the utilities to submit
the following data given below to NERLDC in time and moreover once agreed, they
should abide by that and it should not carry as follow-up action in every OCC
meetings.
Member Secretary I/C requested all the constituents to bring to notice of NERLDC
about the difficulty faced while filling the required formats circulated by NERLDC.
NERLDC was also requested to come with all the formats for discussion with
constituents.
A. Demand for Assam & Arunachal Pradesh
In the 73rd OCC meeting, AGM, NERLDC informed that demand for state for Assam
& Arunachal Pradesh – (area wise demand) & for others – off-peak and peak
demand, Generation Pattern of States, Generation Pattern of ISGS, Outage
Planning of transmission elements, outage planning of generation elements for fifth
month i.e. June, 12 to Oct 12 is necessary. This information is required for
calculation of TTC/ATC to facilitate STOA.
B. Machine Data for Dynamic Simulation for NER Power System :
During the 73rd OCC meeting, AGM, NERLDC informed that during the 69th OCC
meeting, they have intimated that they would undertake dynamic study of NER
system for ensuring security and stability of the grid. For this purpose, technical
data of all generating units are urgently required (especially Assam, Meghalaya &
Tripura & ISGS). Accordingly, NERLDC had circulated the proforma during the
meeting and requested all the constituents to submit the relevant information by
January, 2012, but none of the constituents have submitted the information.
In the meeting NERLDC stated that they have sent reminders to all concerned for
furnishing the same, but till date no constituents have given the above
information. The house was also informed that in case any data is not available,
the information may be put as “not available” so that standard values may be
considered by NERLDC.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
8
C. Transformer Tap Optimization required to operate the system within permissible voltage limit
NERLDC informed that transformer tap data are required to carry out system
study for operating the system within permissible voltage limit. Further, the format
for furnishing relevant transformer data was distributed by NERLDC long back and
it was requested to furnish the relevant data by February, 2012.
All constituent had furnished the relevant information except Ar. Pradesh &
Nagaland.
D. Furnishing of element – wise Protection details.
In the 73rd OCC meeting, AGM, NERLDC informed that the Protection details have
not been received from any of the constituents even after reminder. These data are
required for limit checking of elements while conducting offline load flow study in
NER grid. All power utilities of NER should furnish element –wise relay setting
details.
E. Data required for determination of TTC/ATC for fifth month.
(a) Area wise peak and Off-Peak demand of Assam
-Dhaligaon area, Depota area, Gohpur area, Upper Assam area, South Assam
area and Rest of Assam.
(b) Area wise peak and Off-Peak demand of Arunachal Pradesh
-Ziro area, Itanagar area, Khupi area.
(c) Peak and Off-peak demand of other states
- Manipur, Meghalaya, Mizoram, Nagaland, Tripura.
(d) Peak and Off-peak Generation of states.
(e) Peak and Off-peak Generation of ISGS.
F. Data required for Load Flow Study for evacuation of Pallatana Power
Load Flow Study for evacuation of Pallatana Power considering the ground reality
is essential. Accordingly the current/latest status in respect of the following are
required:-
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
9
1. Relay Setting Details at each end i.e. CT & PT tap setting for protection.
2. Whether lines can be kept in loop.
3. Maximum loading Capacity of lines.
These data have to be furnished by the constituents of 132 kV pocket i.e. Assam,
Meghalaya, Tripura, Mizoram and POWERGRID by 11th June, 12.
G. Submission of Monthly hour-wise restricted demand and unrestricted demand
of states of NER for previous month by 15th day of the month
These data required to be submitted monthly to NLDC and CEA as per their
requirement
The formats for submission of data as given above were circulated to all the
constituents by NERLDC. All the formats were discussed in detail and the queries
of the constituents have been attended. MS I/C, NERPC requested all the
constituents to start filling up these formats and brief their site engineers about
the formats as these data is to be provided by the site engineers/ operators.
Further, he stressed NERLDC to give the contact detail of concerned person of
NERLDC so that in case of any query /ambiguity the constituents may directly
contact the person concerned. The various formats for submitting the above data is
enclosed at Annexure C.7.
The Committee noted as above.
C.8 Looping arrangement of 132 KV Balipara – Ranganadi - Nirjuli – Gohpur - Balipara.
NERLDC informed that due to the grid problem which occurred due to tower
collapsed between ER and NER the test synchronization was deferred. He informed
that once the system is restored to normal, the test would be carried out.
During 74th OCC meeting, NERLDC stated that the testing of looping arrangement
will be carried out this month and the status will be intimated in next OCC
meeting.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
10
NERLDC intimated that the above looping arrangement was tested successfully on
5th July, 2012. NERLDC appreciated Assam for extending their help during the
procedure.
The Committee noted as above.
C.9 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 OCC
meeting.
As suggested by the Sub-committee in 74th OCC meeting, NERPC had uploaded
the current single line diagram and powermap of the NER constituents in NERPC’s
website. Constituents were requested to download the same form NERPC’s website
and do necessary modification/updation, if any.
Assam intimated that they have submitted the requisite information to NERLDC.
MS I/C, NERPC stated that the editable soft copy of the respective 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 give the necessary details for
incorporation of new/up-coming projects.
All the constituents agreed to submit the corrected SLDCs and Power map to NERPC at the earliest.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
11
C.10 Submission of data required for development of Power Atlas of NER & states of NER
NERLDC has 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
74th OCC meeting was as under:
Manipur have furnished only power map & maximum demand met. Mizoram have
furnished power map & maximum demand met. Nagaland has furnished SLD,
power map, maximum demand met. Tripura has furnished SLD, maximum demand
met. Meghalaya has furnished SLD, Maximum, Minimum & Average demand met,
Hydro & Thermal Power Station details, Lines & Sub-Station details. Assam has
furnished SLD, maximum, minimum and average demand met, essential load,
Hydro & Thermal Power Stations details, power map, Lines & Sub-Station details.
Arunachal Pradesh has furnished SLD, power map, maximum & minimum demand
met. POWERGRID has furnished Lines & Sub-Station details.
- Balance data from Assam, Arunachal Pradesh, Manipur, Meghalaya, Mizoram,
Nagaland & Tripura to be furnished by 15th June 12.
- AGBPP, AGTPP, Ranganadi, Kopili, Khandong, Kopili St II, Doyang, Loktak have to
furnish these data by 15th June, 12.
Assam informed that some of the data like DOCO of lines and Sub-stations are
very difficult to produce as these are very old and they can’t trace old documents.
Regarding longitude & latitude data of the old S/S and lines are also not readily
available with them.
The committee advised that for old S/S and lines the approximate DOCO may be
furnished based on some evidence (like date of manufacture of
Transformer/Breaker etc.). Regarding longitude and latitude of Sub-Stations, the
committee advised to take the dead end tower position of POWERGRID tower and
for State sub-stations which are not connected to POWERGRID lines; they can
take the help of POWERGRID as they are having GPS equipments. AGM,
POWERGRID assured that they will extend their help to State utilities for finding
out the longitude and latitude.
All the constituents agreed to submit the above data to NERLDC.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
12
C.11 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.
All the constituents are requested to furnish the above data at the earliest.
C.12 Status of Generation Projects in NER
During 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.
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.
All the constituents are requested to furnish the above data at the earliest.
C.13 Review of Crisis Management Plan (CMP) of Ministry of Power
In the 73rd OCC meeting, NERPC stated that CEA vide their letter dated
27.04.2012 informed that Cabinet Secretariat periodically reviews the Crisis &
Disaster Management Plan (C&DMP) and during the last review in Ministry of
Power, it was indicated that updation/review is to undertaken in the months of
December and June. It is seen that only few utilities are submitting the reports of
mock drills to CEA. The utilities should conduct at least one mock drill during a
quarter by creating emergent situation to which their plants/installations are
vulnerable and furnish the report to CEA. Further, it was mentioned that the
revised document on Crisis & Disaster Management Plan of the power sector to be
submitted by June, 2012.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
13
During 74th OCC meeting, Member Secretary (I/C) stressed to constituents to
submit the report on mock drill exercise to CEA in format circulated.
The committee reviewed the various mock drills to be exercised by the different
utilities at different levels. Member Secretary I/C informed that the format
circulated during 74th OCC meeting by NERPC is a simple format and the utilities
may fill up the formats after completing the mock drills and send the report to CEA
under intimation to NERPC Secretariat.
All constituents agreed to do the mock drill exercise and submit the reports.
C.14 Distribution of PSS/E Software application:
In the 73rd OCC meeting, AGM, NERLDC requested the constituents to nominate a
nodal officer with contact details including e-mail id for receipt of this PSS/E-
software and other matters relating to training, signing of license agreement etc.
During 74th OCC meeting, NERLDC stated that they have not received the
nominations from any constituents except MeECL. SE(O), NERPC stressed the
constituents to nominate their nodal officers and receive the PSS/E-software,
which will enable them to carry out load flow studies of their system for PoC
charges calculations.
The names of Nodal officers for receiving the PSS/E-software have been submitted
by MeECl, Assam and Tripura. The committee stressed other constituents to
nominate their Nodal officers and co-ordinate with NERPC for receiving the above
software.
All the constituents agreed to co-ordinate with NERPC for above software.
C.15 Time drift in Special Energy Meters of NER:
In the 73rd OCC meeting, AGM, NERLDC stated that 223 Nos. of Special energy
Meters are installed in 59 metering locations of NER. Checking for time drift of the
meters is carried out at NERLDC from time to time. Generally site locations while
collecting weekly reading through DCD are supposed to check meter time with
reference to standard time and in case of drift should give time advance/retard
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
14
command accordingly through DCD. Through this process, one minute time
adjustment can be done per week. As this is not being followed, it has been
observed that most of the meters have time drifted to various degrees. This issue
needs to be addressed immediately. Following procedure may be followed:
a. The enclosed format should be filled - up by specified data collecting locations
and sent to NERLDC by e-mail / fax.
b. Looking at the time drift, action should be taken to advance/retard time
through DCD till meter time and standard time difference comes down to less
than one minute.
c. The format should be filled – up and sent on weekly basis along with SEM
data collected so that corrective action taken can be observed.
d. Status will be reviewed in every OCC / CCM with filled – up formats. In case
of any assistance / guidance regarding the procedure of time advance/retard,
OS Deptt of POWERGRID, NERTS may be contacted.
NERLDC had circulated the requisite format during the meeting and requested all
the constituents to comply the same for reviewing in OCC meetings.
During 74th OCC meeting, Constituents have requested NERLDC to give a demo on
how to adjust the time drift in SEMs so that they should not find any difficulty
while adjusting the time drift. NERLDC agreed to give a demo on next OCC
meeting.
NERLDC informed that they have received communication from L&T that there is
some problem in time drift adjustment. After rectifying the problem, the demo will
be given.
The Sub-committee noted as above.
C.16 Low Voltage at Loktak S/Station:
During the 73rd OCC meeting, representative from NHPC stated that low voltage is
prevailing in Loktak S/Stn, even though there was no inductive load nearby
Loktak. They requested the Sub-committee to look into this and find out the
reason of low voltage.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
15
In 74th OCC meeting, NHPC representative stated that their site engineers are
collecting the voltage profile and will send it to NERLDC. Further, he stated that
during peak hours due to low voltage problem, field current has to be increased
which leads to higher current in generators and they gets tripped on over current.
After detailed discussion the sub-committee suggested NHPC to check their
excitation system and AVR settings. NHPC agreed to look into the matter and
informed the status to the sub-committee.
NHPC representative informed that they have submitted the voltage profile of their
plant to NERLDC. Further, he stated that the low voltage problem is only during
the peak hours; it may be due to some reactors at Aizwal or Jiribam end. He
requested POWERGRID and NERLDC to confirm the Switching off of the reactor
during peak hours at Jiribam and Aizwal end.
NERLDC/POWERGRID stated that the status will be intimated in the next OCC
meeting.
The Sub-committee noted as above.
C.17 Voice & Data Communication and SCADA integration i.r.o. Pallatana project and ATS
The issue has been taken up at RPC forum for ensuring the same & follow up
action also taken up by NERLDC.
During 74th OCC meeting, DGM, NERLDC stated that voice & Data communication
and SCADA integration for Palatana Project and its ATS is required to be
completed for grid operation as the project is scheduled to be commissioned by
July, 2012.
The status could not be updated as OTPC and NETC representatives were not
present.
The Sub-committee noted as above.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
16
C.18 Schedule of commissioning of bays, lines reactors, transformers along with responsibilities i.r.o. Pallatana Project and ATS –
Details of responsibilities of different organizations at different locations in respect
of installation & commissioning of bays, lines, reactors, transformers etc alongwith
schedules of commissioning are required for better co-ordination. During 74th OCC
meeting all the constituents were agreed to furnish the data to NERLDC.
DGM, NERLDC informed that till date they have not received any data in this
regard.
The Sub-committee noted as above.
D. N E W I T E M S D.1 Rectification of 132 KV isolator at 79-Tilla Grid Sub-Station - Tripura
It is well known by the PGCIL that out of 6(six) nos. “Double pole center break”
type line isolators and auxiliary bus isolators connected at RC Nagar line I & II
bays at 79-Tilla Grid Sub-Station, Agartala , 3 (three) nos isolators are fully out of
order and 3(three) others are not functioning properly. Even “Earth Switches” are
also lying out of order. In the 72nd OCC meeting, PGCIL assured that they will take
up the work very shortly, but no field activities has been found till date. Hence, it
is once again requested to take up the necessary work at the earliest to avoid any
unwanted occurrence during operation of those isolators.
AGM, POWERGRID informed that the order has been placed for the isolators and
the same will be commissioned soon. He stated that the delay was due to difficulty
in getting the replacement as the isolators are very old.
Further, he informed the committee that POWERGRID has still not taken over the
assets of 79 Tilla Grid S/S form Tripura as it was deposit work given to Tripura.
Tripura representative stated that it is very difficult for them to trace out the
commissioning documents as the Sub-station is very old.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
17
The committee advised POWERGRID and Tripura to complete the necessary
handing over/taking over of the 79 Tilla Grid S/S at the earliest so that there
should not be problem in maintaining the S/S.
The Sub-committee noted as above.
D.2 Restriction in drawal by Tripura
During continuous shutdown of 132 kV Halflong - Jiribam line from 14th June’12,
Tripura’s drawl schedule was around 75-87 MW during evening peak hours
including 10 MW additional power purchase through STOA by TSECL. But Tripura
could not avail to draw its actual schedule quantum of power due to drawl
restricted (65 MW) by RLDC for system constraint. Though NERLDC has given
Open Access clearance for purchase of additional 10 MW power swapping.
Tripura stated that once STOA has been approved, NERLDC should allow Tripura
to draw the quantum of power from grid and during emergency situations NERLDC
should curtail the STOA.
NERLDC clarified that the STOA approval has been given based on calculation of
the inter-regional TTC not Control Area wise TTC. Therefore, NERLDC cannot
curtail the STOA for emergent conditions.
The committee requested all the constituents to co-operate NERLDC during such
type of situation arising due to urgency/threatening grid conditions.
The Sub-committee noted as above.
D.3 Proforma for Operational Statistics - NERPC
The proforma for operational Statistics as given below was circulated in the 73rd
OCC meeting. The same was requested to be furnished in the next OCC 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, drawal schedules and entitlements of constituents.
(v) – Details of major reservoirs in NER.
The operational Statistics for June, 2012 is enclosed at Annexure D.3.
The Sub-committee noted as above.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
18
D.4 State-wise anticipated peak demand/requirement, shortage for July, August, September, October & November, 2012.
The sub-Committee reviewed & finalized the anticipated peak demand/energy requirement/Availability for the months of July, August, September, October & November, 2012.
A. Peak Demand
B. Peak Availability
The Committee noted as above.
S.No.
State
Peak
Demand
(MW)
Jul’ 12
Peak
Demand
(MW)
Aug’ 12
Peak
Demand
(MW)
Sep’ 12
Peak
Demand
(MW)
Oct’ 12
Peak
Demand
(MW)
Nov’ 12
1 Ar. Pradesh 110 110 110 110 100
2 Assam 1050 1100 1100 1150 1150
3 Manipur 100 110 105 110 100
4 Meghalaya 260 270 265 270 280
5 Mizoram 70 70 70 75 75
6 Nagaland 105 105 110 110 100
7 Tripura 195 225 230 250 240
Region 1890 1990 1990 2075 2045
S.No.
State
Peak
Availability
(MW)
Jul’ 12
Peak
Availability
(MW)
Aug’ 12
Peak
Availability
(MW)
Sep’ 12
Peak
Availability
(MW)
Oct’ 12
Peak
Availability
(MW)
Nov’ 12
1 Ar. Pradesh 65 110 110 110 90
2 Assam 800 1050 1050 1050 1000
3 Manipur 70 100 105 105 90
4 Meghalaya 185 200 210 220 200
5 Mizoram 40 70 70 70 60
6 Nagaland 70 100 105 105 95
7 Tripura 120 170 165 175 165
Region 1350 1800 1815 1835 1700
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
19
D.5 Generation Planning (ongoing and planned outages)
The daily availability for hydro stations as given in the meeting is given below.
Khandong – 1.08 MU
Kopilli – 2.38 MU
Ranganadi - (subject to inflow)
Doyang – 1.08 MU
Loktak - 1.20 MU
The shutdown proposal approved by the committee is enclosed at Annexure D.5.
The Sub-committee noted as above.
D.6 Outage Planning Transmission elements
The Sub-committee stressed all the utilities to submit the shutdown proposal
latest by 30th of preceding month. After detail discussion the sub-committee
approved the shutdown proposal for July/Aug, 2012 as given in Annexure – D.6.
The Sub-committee noted as above.
D.7 Estimated Transmission Availability Certificate (TAC) for the month of June, 2012.
The Estimated Transmission/System Availability for the month of June, 2012
furnished by PGCIL is 99.9173 % as per details at Annexure D. 7. NER
constituents were requested to give their comments and observations, if any, by
27th July, 2012 so that Final TAC for the month of June, 2012 can be issued.
The sub-Committee noted as above.
D.8 Major grid disturbances in the previous month (June, 2012 )
There was no major grid disturbance during the month of June, 2012.
The sub-Committee noted as above.
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
20
D.9 Agenda items by Assam
Early revival of 3 numbers of 20 MVA Transformers at Kopili
Assam observed that right from the time of the commissioning of 160 MVA Auto
transformer of Power Grid at Kopili, the existing 3 numbers of transformers having
capacity 20 MVA each supplied by NEEPCO are not in working condition till today.
Therefore, it is requested to kindly make necessary arrangement for revival of the
above mentioned transformers for strengthening of the grid security at an early
date.
The NEEPCO representative informed that the above said transformers were not
charged since March, 2011.
The committee suggested NEEPCO to keep the 3X 20 MVA transformers in charged
condition so that it can be connected to grid in case of outage of 160 MVA
Autotransformer.
NEEPCO stated that after completion of Shutdown of Kopili-Khandong line the
transformers may be test charged after doing the necessary oil filtration.
The sub-Committee noted as above.
D.10 Date & Venue of next OCC meeting
It is proposed to hold the 76th OCC meeting of NERPC on 10th August, 2012
(Friday). As per roster Manipur would be the host for 76th OCC meeting.
The meeting ended with thanks to the Chair.
*******
Minutes of 75th OCC meeting held on 6th July, 2012 at Guwahati
21
Annexure-I
List of Participants in the 75th OCC meeting held on 06/07/2012
SN Name & Designation Organization Contact No.
1. No Representative Ar. Pradesh
2. Sh. J.P.choudhury, AGM Assam 09954055295
3. Sh. A .K. Sakia, AGM, SLDC Assam 09864116176
4. Sh. J. K. Baishya, AGM, SLDC Assam 09954055295
5. Sh. H. K. M. Baruah, DGM Assam 09954709475
6. Sh. R. Dohutia, DGM Assam 09435047753
7. Sh. M.K. Adhikari, DGM, Comml Assam 09864049287
8. Sh. Sanjeev Goswami, OSD to MoP Assam 09864035095
9. No Representative Manipur
10. Sh. T. Gidon, AEE Meghalaya
11. Sh. H R F Haden, AE Meghalaya
12. Sh. H. Lalnunsanga, AE Mizoram 09436144651
13. No Representative Nagaland
14. Sh. Bikram Debbarma, DGM, SO Tripura 09436450501
15. Sh. N.R.Paul, DGM NERLDC 09436302723
16. Sh. A. Mallick, CM NERLDC 09436302720
17. Sh. Anupam Kumar, Engineer. NERLDC 09436335379
18. Sh. K. Bhuyan, AGM (OS) NERTS 09435505419
19. Sh. A. K. Sharma, Manager NERTS 09436335241
20. Sh. H.K. Changmai, DGM (E) NEEPCO 09435577595
21. Sh. B. Goswami, Sr. Mgr. (O&M) NEEPCO 09436163983
22. Sh. R. C. Singh, Mgr.(E) NHPC 09436894889
23. Sh. A.K. Mishra, Member Secretary I/C NERPC 09402134275
24. Sh. S.K. Ray Mohapatra, SE (Coml) NERPC 09818527857
25. Sh.B. Lyngkhoi, SE (O) NERPC 09436163419
26. Sh. D.K. Bauri, EE NERPC 09863317236
.……ooOoo….
Annexure D.3.iii
1. Instantaneous
1.1 Maximum Frequency 50.68 Hz on 3rd June-12 at 18:04:00
2.2 Minimum Frequency 48.75 Hz on 12th June-12 at 11:04:00
2. % of time when Frequency was2.1 Below 48.5 Hz 0.02.2 Between 48.5 Hz and 48.8 Hz 0.12.3 Between 48.8 Hz and 49.2 Hz 3.92.4 Between 49.2 Hz and 49.5 Hz 19.42.5 Between 49.5 Hz and 49.7 Hz 28.72.6 Between 49.7 Hz and 50.2 Hz 49.22.7 Between 50.2 Hz and 51 Hz 1.42.8 above 51.5 Hz 0.03.1 No. of times Frequency Touched 48.80 Hz 57.0
Frequency Particulars during Jun'12(As per Frequency Report of NERPC)
Annexure D.3.IV
State Entitlement Schedule in MUs Actual/Drawal in MUs
Arunachal Pradesh 43.63 56.00 44.38Assam 226.66 394.13 371.72
Manipur 38.88 53.13 40.67Meghalaya 58.70 80.04 66.47Mizoram 24.36 32.91 26.56Nagaland 27.13 38.49 37.22Tripura 35.98 39.90 27.69
Month of Jun'12Details of Entitlement/ Schedule/ Drawal by the Constituents from Central Sector Stations
Annexure D.3.V
Sl No ParticularsA Level (at the end of the month) FRL MDDL Level1 Khandong in mtr 719.30 704.00 720.002 Kopili in mtr 609.50 592.83 603.773 Loktak in mtr 768.50 766.20 766.704 Barapani in ft 3220.0 3150.0 3175.085 Gumti in mtr 93.55 83.60 87.956 Doyang in mtr 333.00 306.00 309.70B Corresponding figure of (Last year) FRL MDDL Level1 Khandong in mtr 719.30 704.00 719.92 Kopili in mtr 609.50 592.83 608.533 Loktak in mtr 768.50 766.20 768.614 Barapani ft 3220.0 3150.0 3196.825 Gumti in mtr 93.55 83.60 86.006 Doyang in mtr 333.00 306.00 313.30
Level of Major Reservoirs in North Eastern Region at the end of Month of May'12
Annexure-D.5
Shutdown Programme for the month of July, 2012 as approved in the75th OCCM held on 06.07.2012 at Guwahati.
S/D PROGRAM FOR NEEPCO: Name of Generating Station Date Time Purpose Areas / Feeders Affected
AGBP U # 2 15.07.12 to 13.08.12
Continuous S/D AGBP U # 2 Ranganadi U # 2
AGTP U# 3 21:00 Hrs of 08.07.12 to 03:00 Hrs of 10.07.12
Compressor washing AGTP U# 3
AGTP U# 4 21:00 Hrs of 10.07.12 to 03:00 Hrs of 12.07.12
Compressor washing AGTP U# 3
AGTP U #2 37 days (Defer after TCC) Major overhauling & commissioning
of GT control Panel AGTP U #2
Annexure-D.6
Shutdown Programme for the month of July, 2012 as approved in the75th OCCM held on 06.07.2012 at Guwahati.
S/D PROGRAM FOR POWERGRID TRANSMISSION LINES & ITS ASSOCIATED BAYS:
S/N Name of Tr. Lines Date Time Purpose Areas / Feeders Affected
1 132kV BTPS- Dhaligaon
08.07.12 to 12.07.12 08:00 to 16:00 Hrs
For stringing work of 400 kV D/C Bongaigaon-NTPC line
132kV BTPS- Dhaligaon
2
132kV Gohpur- Nirjuli (Subject to consent of Ar. Pradesh)
20.07.12 to 28.07.12 & 31.07.12 to 02.08.12
08:00 to 16:00 Hrs For shifting of locations No. 73 & 75 on pile foundations affected by erosion by nearby river.
132kV Gohpur- Nirjuli
29.07.12 to 30.07.12 Continuous S/D
3 132 kV Agartala-Agartala-I 13.07.12 08:00 to 16:00 Hrs Shutdown required for
strengthening of jumpers by providing additional jumpers.
132 kV Agartala-Agartala-I
4 132 kV Agartala-Agartala-II 14.07.12 08:00 to 16:00 Hrs 132 kV Agartala-
Agartala-II
5 132kV Khandong - Kpoili-I
20.07.12 to 30.07.12 Continuous S/D
1. Shifting of conductors of Ckt-II from ERS to new D/C towers 2. Shifting of conductors of Ckt-I from existing single tower to new D/C tower. (The work was postpones due to fatal accident, heavy rain affecting the work)
132kV Khandong - Kpoili-I 01.08.12 &
09.08.12 08:00 to 16:00 Hrs
6 132kV Khandong - Kpoili-I
20.07.12 & 30.07.12 08:00 to 16:00 Hrs
132kV Khandong - Kpoili-I 01.08.12 to
09.08.12 Continuous S/D
7 400kV Balipara-Bongaigaon-I
23.07.12 to 24.07.12 08:00 to 16:00 Hrs To facilitate shifting of
208-loc.211 of the line necessitated as a result of Railway Tract Gauge Conversion being carried out by Indian Railways.
400kV Balipara-Bongaigaon-I
8 400kV Balipara-Bongaigaon-II
25.07.12 to 26.07.12 08:00 to 16:00 Hrs 400kV Balipara-
Bongaigaon-II
9 132 kV Silchar-Srikona-I &II
07.07.12 to 10.07.12 09:00 to 16:00 Hrs
To facilitate stringing of 400 kV Silchar-Bongaigaon line
132 kV Silchar-Srikona-I &II
10 132 kV Aizawl-Jiribam
08.07.12 to 13.07.12 Continuous S/D
For shifting vulnerable location no. 197 affected by landslide
132 kV Aizawl-Jiribam
S/D PROGRAM FOR NHPC TRANSMISSION LINES & ITS ASSOCIATED BAYS:
8 132 kV Loktak-Imphal –I (Subject to consent of Manipur)
10.07.12 to 19.07.12
Continuous S/D Replacement of old MOCB by new SF6 CB (SPR) Maintenance Works
132 kV Loktak-Imphal -I
9 132 kV Loktak-Imphal -II Deferred to
next OCC
132 kV Loktak-Imphal -II
Loktak-Jiribam -II Loktak-Jiribam -
II
Annexure-D.6
S/D PROGRAM FOR AEGCL SUB-STATIONS / BAYS / ICTS/ REACTORS S/N Name of
Elements Date Time Purpose Areas / Feeders
Affected Ziro S/S
1 15 MVA ICT (Subject to consent of Ar. Pradesh)
10.07.12 to 11.07.12 08:00 to 16:00 Hrs
Installation of Nitrogen Injection cooling system for
protection of ICTs 15 MVA ICT
Misa S/S
2 315 MVA, 400/220 kV ICT-II
07.07.12 to 09.07.12 08:00 to 16:00 Hrs Installation of Fire fighting
system for protection of ICT 220 kV Samaguri Bus I &II
3 220 kV Bus-A 09.07.12 08:00 to 16:00 Hrs Installation of Fire fighting system against new ICT 220 kV Bus-A
4 220 kV Misa-Mariani Bay 17.07.12 08:00 to 16:00 Hrs For overhauling of existing CB 220 kV Misa-
Mariani Bay
5 220 kV Bus-B 17.07.12 08:00 to 16:00 Hrs For dismantling of CB in 220 kV Mariani bay 220 kV Bus-B