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Minutes of 142nd Operation Coordination Sub-Committee (OCC) meeting of NRPC held on 14.12.2017 & 15.12.2017 at NRPC Secretariat, New Delhi.

142nd Operation Coordination Sub Committee (OCC) meeting of NRPC was held on 14.12.2017 &15.12.2017 at NRPC Secretariat, New Delhi. The list of participants is at Annexure 1. SE (O), NRPC welcomed all the participants to the meeting. He, than requested, Sh P. K. Agarwal, ED, NRLDC, to highlight the major issue being faced by the Northern Grid in the present scenario. ED, NRLDC expressed concerns regarding the prevailing conditions of the grid wherein the grid was operating under reduced frequency for last one month and even under low frequency conditions most of the utilities were overdrawing continuously, further deteriorating the situation. He informed the members of all the utilities present that NRLDC has taken a very strict view of the same and has decided to file a petition to CERC if the situation of low frequency and over drawal persists further. SE (O), NRPC stated that maintaining stable operation of the grid is a collective responsibility of all the members and advised all the members to refrain from overdrawing / under drawing from the grid if the condition does not permit for the same. 1. Confirmation of Minutes:

The minutes of the 141st OCC meeting held on 14.11.2017 and 15.11.2017 at New Delhi were issued vide letter of even number dated 01.12.2017. Sub-committee confirmed the Minutes.

2. Review of Grid operations of last month (November 2017): 2.1 Anticipated vis-à-vis Actual Power Supply Position (Provisional) for November, 2017. Sub Committee was informed that there was vide variations (i.e. > 5.0%) in the Anticipated vis-à-vis Actual Power Supply Position (Provisional) for the month of November, 2017 in some states. It was observed that in the terms of Energy requirement variation was for Haryana, HP, & Uttarakhand and in the terms of Peak demand for Delhi, Haryana, Rajasthan & UP. SE (Operation) highlighted that the variations of 4-5 states is continuing every month though the LGBR figures for the next month are also shared as agenda item in every OCC. He also proposed to all that they should give the Anticipated figures after taking all factors in consideration. UP representative intimated that the Peak demand was higher as the temperature in first week of November 2017 was higher than anticipated temperature. Also it was highlighted by the representative that the availability of power was less due to coal shortage at Bara, Lalitpur & Rosa TPS. Also schedule from CGS was less as compared to last year; it may be due to lower water availability ion Hydro generating stations. SE operation added that the specific reasons be given for the variation in the Anticipated vis-à-vis Actual Power Supply Position (Provisional). .

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All SLDCs were requested to furnish the provisional and final power supply position in prescribed formats by 2nd and 15th day of the month respectively in compliance to the provision 5.3 of IEGC

2.2 Power Supply Position for NCR: The Sub-Committee was informed that the NCR Planning Board (NCRPB) is closely monitoring the power supply position of National Capital Region. Monthly power supply position for NCR till the month of November, 2017 is placed on NRPC website. Members were requested to furnish the data on regular and time bound manner.

2.3 Representative of NRLDC made a presentation on grid operation during November, 2017 and highlighted the following:-

Frequency remained within the prescribed band for 75.53% of the time during November, 2017 which is better than last year during same month (November, 2016) when frequency (within normal band) remained 72.76% of the time. 10% of the time frequency remained above the band and 17% of the time frequency remained below the band. Utilities were requested to take necessary action to further improve the frequency regime viz. staggering of load at hourly boundaries, primary response from the generators etc.

Peak demand met, Average demand met and minimum demand met for the region during November, 2017 was 43249MW, 35880 MW and 28179 MW respectively. The maximum and minimum frequencies were 50.27 Hz and 49.62 Hz respectively.

Maximum deviation was observed in Haryana, Rajasthan, HP followed by Uttarakhand in terms of OD and by Chandigarh & Delhi in terms of UD during November, 2017. Utilities were requested to maintain their drawl as per schedule.

Average consumption of the Region for November, 2017 increased by 4% (33 MU per day) for corresponding month in previous year.

Average Thermal generation in November, 2017 increased by 11% (55 MU/Day) for corresponding month in previous year.

Average Hydro generation in November, 2017 decreased by 5 MU for corresponding month in previous year.

Average Renewable generation in November, 2017 decreased by 1.3 MU/Day for corresponding month in previous year.

Average nuclear generation in November, 2017 increased by 8 MU/day per day as compared to corresponding month in previous year.

Net Average Inter-Regional import decreased by 23 MU/day during November, 2017 as compared to corresponding month in previous year.

Net Average Import from WR decreased by 34 MU/Day during November, 2017 as compared to corresponding month in previous year.

Net Average Import from ER increased by approx. 5 MU/day during November, 2017 as compared to corresponding month in previous year.

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Net Average Import from NER was 2 MU/day more during November 2017.

Consumption of Delhi, UP, Uttrakhand , HP and J&K was 9.76,6.17,4.87,4.61 and

7.85% higher during November, 2017 as compared to November, 2016 Total availability during November, 2017 had increased by 32.33 MU/day as

compared to corresponding month in previous year. Total Energy approved in STOA decreased as compared to last year November-2016

{November-2017 (942.51 MU) and November-2016 (1080 MU)} while the number of application increased.

Total outages during November, 2017 were 881 including Planned S/downs (514) and Forced S/downs (Trippings-218+Emergency S/Ds-149 = 367).Utilities were requested to reduce the tripping as well as emergency shutdown.

There was no record break in term of maximum consumption and demand during the month November-2017.

Total outages of generating Units due to less demand/less gas availability were 1080 MW as on 14.11.2017(SS 1080 MW).

Total outages of generating Units due to coal shortage were 660 MW as on 14.11.2017(SS 660 MW).

The difference between data received from SCADA and SEM in terms of %age was shown as Punjab (0.72), Rajasthan (1.05), Delhi (0.75), Uttarakhand (2.0), UP (0.16), HP (1.76) ,J&K (0.89) and UT Chandigarh (1.89).

Total 117 feeders of 400kV were opened 829 times, and 4 feeders of 765kV were opened 81 times during November 2017 due to high voltage in system.

Representative of NRLDC told that some of the states are uploading the forecasting

data on FTP on regular basis while some are not regular. Hence it was requested to all states to upload the data on FTP on regular basis. It was also requested to reduce the RMSE below 3%.

Long outages of generating units and transmission lines were discussed, all

constituents were requested to revive the elements under long outages at the earliest.

S. No.

Transmission Element Outage Date Expected Revival

1 400kV Bawana-Mundka-1 14.05.2017 30.01.2018 2 400kV Bawana-Mundka-2 14.05.2017 30.01.2018 3 315 MVA ICT-2 at Auraiya 07.06.2017 18.12.2017

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4 400kV Jhajjar CLP-Dhanoda-1 14.06.2017 15.02.2018 400kV Jhajjar CLP-Dhanoda-2 14.06.2017 15.02.2018 6 315 MVA ICT-1 at Kalisindh 04.06.2016 31.12.2017 7 500 MVA ICT-3 at Rajpura 18.06.2017 15.01.2018 8 500 MVA ICT-2 at Dhuri 19.08.2017 31.03.2018

Multiple tripping of transmission lines were discussed, all concerned were requested to take necessary action for the same to avoid multiple tripping of single element. 1. 400kV Aligarh-Sikandrabad-2 tripped 5 times in the month of November-2017.

Representative of UP told that there are slaughter house around 25km from Aligarh. There are birds flying leading to tripping of above line. Birds guard installation is under process and would be completed with 2-3 months.

2. Representative of UP intimated that the problem of Auto-reclose at Unnao has been attended and resolved.

Representative of NRLDC told that FSC of Meerut-Koteshwar-2 is out since long , necessary action needs to be taken to restore it at the earliest as loading on these circuits remains high during peak hours.

Demand pattern of Rajasthan for past thirty days was shown and it is clear that there is sharp rise in demand during morning(05:00 hrs) and night hours(22:00 hrs), representative of NRLDC requested to stagger their load at these boundary hours, even as per regulation also only 100 MW may be connected or disconnected to grid at a time.

Representative of NRLDC also showed the data of renewable and it was requested to

all the utilities to provide renewable data in DO report and telemetry at NRLDC.

Continuous OD by Haryana & Rajasthan during the November-2017 was discussed. Representative of Rajasthan and Haryana told they are following up with their DISCOM, however they have some limitations also. Representative of NRPC stated that SLDC has to show some action against such kind of OD. If there is petition against the SLDC then only SLDC has to reply. Representative of NRPC also told that Haryana and Rajasthan had OD at low frequency as they had large amount payable towards deviation settlement account. He also told that State SCADA team should check the data and inform to NRLDC, if any substantive mismatch is there in SCADA and SEM. Representative of NRLDC also requested to all the utilities to keep more and more machines on bar, however generation may be back down during off peak hours.

ED NRLDC expressed his concerned towards grid indiscipline. He expressed concern over low frequency during last few months. There was over drawl during low frequency and under drawl during high frequency. It was also stated that machines come only after having over drawl for one day or more, which is bad planning by the constituents .He also requested all the constituents to bring machine on bar timely depending upon load forecasting. He also stated that if the above conditions still persist, then NRLDC would be filing petition in CERC against the

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defaulters. He further added that there were some grid incidents recently at Panki, Unnao and Dadri that needs to be taken care and actions are to be taken to avoid such instances in future. Representative of NRPC also requested to all constituents to take care of concerns expressed by ED NRLDC and that they should avoid Over drawl at low frequency and under drawl at high voltages.

Representative of NRPC told that STOA should not be included in the long term anticipated availability and only LTA/MTOA should be considered as there is much variation. He also told that allocation and planning is done on the basis of LGBR, so reason needs to furnished for significant variation in power supply position. Moreover, reason for the variation in power supply position must be provided by the constituents to RPC along with PSP data every month. Representative of NRLDC suggested that there may be quarterly meeting for LGBR. Representative of NRLDC also expressed his concern towards much variation in availability.

Representative of NRPC told that some of states are showing their agriculture load zero (Such as Delhi is showing its agriculture load as nil). However he came to know that there is agricultural load in Delhi He stated that the correctness of data supplied to NRPC must be ensured as this data is forwarded to many agencies. There may be specific question in parliament on this. So it needs to be taken care in power supply position from the next time onwards.

Representative of NRLDC told that 400kV CLP Jhajjar-Dhanoda-DC and Bawana-

Mundka-DC are out since long and it is not good for security of the grid. He also stated that petition would be filed if such condition persists further. He also asked the representative of Haryana to restore the same at the earliest. However representative of Haryana told that there is a severe problem of ROW in this line and matter would be taken up with their management for the restoration of above lines at the earliest and would revert back. Representative of NRLDC told that it takes around six months to restore the lines on normal after tower collapse, so ERS must be purchased. However representative of Haryana stated that process has been started for purchase of ERS.

Representative of NRLDC also told that there is repetitive shutdown at Dhanoda substation; representative of Haryana told that this matter would also be taken up with their management and will be updated after having discussion with the management. Representative of NRPC also requested to take of care of repetitive shutdowns at Dhanoda and long outages.

Representative of NRPC told that there is a Hon’ble CERC order for implementation of AGC and according a presentation was given by NLDC for first pilot of Dadri AGC implementation.

3 Maintenance Programme of Generating Units and Transmission Lines:

3.1. Maintenance Programme for Generating Units.

The maintenance programme for Generating Units for the month of January 2018 was discussed on 14.12,2017 at NRPC Secretariat, New Delhi. The approved/deferred outages of

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generating units as per deliberations in OCC stands issued vide letter dated 20.12.2017 _____20.12.2017________

3.2. Outage Programme for Transmission Elements.

The Outage programme of transmission assets for the month of January 2018 was discussed on 14.12.2017 at NRPC Secretariat, New Delhi. The approved/deferred outages of transmission assets as per deliberations in OCC meeting stands issued vide letter dated 20.12.2017

4 Planning of Grid Operation:

4. Anticipated Power Supply Position in Northern Region during January 2018 as per LGBR for 2017-18:

Anticipated Power Supply Position in Northern Region during January 2018 (As per LGBR is enclosed at Annexure 4) was discussed and the SLDCs were requested to update the estimated PSP & submit measures proposed to be taken to bridge the gap in availability as well as dispose of the surplus’s if any.

5 Information about variable charges of all the generating units in the Region.

The variable charges for different generating units are available on the Merit Order Portal

All utilities were requested to ensure that the process of Scheduling was done as per Merit Order Despatch and in case of variations the same should be informed along with the reasons for the same.

6. Study by POWERGRID for reactive compensation at 220 kV level:

POWERGRID, in September, 2016 had submitted its report on Reactive compensation in Northern Region. Based on the reservations of Delhi and Rajasthan to the recommendations made by POWERGRID in the report, NRPC in its 39th meeting had advised for referring the report by POWERGRID and study by Rajasthan to standing committee on Power System Planning of NR.

In the 39th Meeting of SCPSPNR held on 29th&30th May 2017 following was agreed:

a) TCR of capacity 500 MVAr at Kurukshetra 400 kV bus.

b) Bus Reactors at 30 no. 220 kV sub-stations and 18 no 400 kV level sub-stations subject to the availability of space. It was also agreed that these reactors shall be provided by the owner of the substations.

Reactors approved in the 39th Standing Committee held on 29th & 30th May 2017

Sl.No. Bus Name State Reactors Proposed(MVAr) 220kV

1 Jind(PG) Haryana 25 2 Fatehabad(PG) Haryana 25 3 Kishenpur(PG) J&K 25 4 Jalandhar(PG) Punjab 2X25

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5 Nakodar Punjab 25 6 Amritsar(PG) Punjab 25 7 Dhuri Punjab 25 8 Akal Rajasthan 25 9 Suratgarh Rajasthan 2X25 10 Bikaner Rajasthan 2X25 11 Barmer Rajasthan 25 12 Narela Delhi 25 13 R.K.Puram-I Delhi 25 14 Patparganj 2 Delhi 2X25 15 Maharanibagh(PG) Delhi 2X25 16 Bamnoli Delhi 25 17 SabjiMandi Delhi 2X25 18 Gopalpur Delhi 2X25 19 Indraprastha Delhi 2X25 20 Geeta Colony Delhi 2X25 21 Harsh Vihar Delhi 2X25 22 Wazirabad Delhi 2X25 23 Electric Lane Delhi 2X25 24 Mandola Delhi 25 25 AIIMS Delhi 2X25 26 SaritaVihar Delhi 25 27 Bawana Delhi 25 28 PreetVihar Delhi 25 29 Mundka Delhi 25 30 Masjid Moth Delhi 25

400kV 1 Maharanibagh(PG) Delhi 125 2 Mundka Delhi 125 3 Mandola(PG) Delhi 125 4 Hissar(PG) Haryana 125 5 Kala Amb(TBCB) Himanchal 125 6 Chamera Pooling Stn.(PG) Himanchal 125 7 Kishenpur(PG) J&K 125 8 Nakodar Punjab 125 9 Jullandhar(PG) Punjab 125 10 Moga(PG) Punjab 125 11 Dhuri Punjab 125 12 Patiala(PG) Punjab 125 13 Jodhpur Rajasthan 125 14 Sikar(PG) Rajasthan 125 15 Allahabad(PG) U.P 125 16 Meerut(PG) U.P 125 17 Kashipur Uttarakhand 125 18 Srinagar Uttarakhand 80

The discussions held in the last two OCC meetings are as under: 140th OCC meeting: The representative of RVPNL informed that as intimated in the 139th OCC meeting, the scheme would not be split into two (of static and dynamic reactors) and reply would be sent to PSDF approval committee clarifying their reservations.

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37th TCC/40th NRPC meeting:- POWERGRID was requested to commission TCR of capacity 500 MVAr at Kurukshetra 400 kV bus at the earliest citing the stabilization of Champa-Kurukshetra HVDC link. 141st OCC meeting: POWERGRID informed that 500 MVAr TCR at Kurukshetra would be commissioned within 30 months. NTPC informed that 125 MVAr Bus reactor at Dadri would be commissioned by February 2018 and was delayed on account of problems being faced at site in laying the foundation of the bus reactor as water logging problem is persisting. 40th NRPC had also advised all the utilities to commission the reactors at the earliest and to submit the detailed action plan with the timeline. NRPC had further pointed that these reactors are essential for maintaining the voltage level of the grid and needs to be commissioned within 26 months. 142nd OCC meeting:

Concerned utilities were again requested to furnish the action plan along with the timeline and the status of action taken for the installation of reactors by 31.12.2017.

7. System Study for Capacitor Requirement in NR for the year 2017-18 & 2019-20

In the 37th NRPC meeting the proposal for entrusting the work of System Studies for the year 2016-17 and 2017-18 to CPRI was approved and accordingly a Letter of Award (LoA) was issued to CPRI for carrying out the studies with consultancy charges of Rs. 20 Lakh plus Service tax after the approval of Chairperson, NRPC. Due to delay in data submission by the utilities for the period of FY 2016-17 it was decided to conduct the studies for 2017-18 and 2018-19.

For study of the period 2017-18:

CPRI has submitted the report for capacitor requirement for 2017-18 and according to the outcomes of the study conducted by CPRI 39th NRPC approved the proposal of installation of capacitor by Haryana, Punjab and Uttar Pradesh as proposed by the respective States for funding through PSDF. NRPC also approved that installation of capacitor in J&K limited to 1102 MVAR (as per study of CPRI).

139th OCC meeting:

Representative of UP had some reservations regarding the quantum of capacitor bank under operation and that being reflected in the report submitted by CPRI. It was informed that, the figure mentioned in the report was 1367.2 MVAR, however, it was somewhere in the range of 5000 MVAR operational in their system.

Representative of CPRI in the meeting assured rechecking the data incorporated in their study. He further informed that, during the study, help of power maps available on UPSLDC’s website was also taken as it was not possible to trace the details of upstream substation for the capacitor submitted at 11kV and 33 kV level.

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In the meeting the issue of identifying the 11kV and 33kV feeders corresponding to the recommendation of CPRI for capacitor installation (recommendation made at 220kV and 132kV substation by lumping the downstream network) was also discussed. It was opined that, for a radial system the requirement as recommended can be more or less equally distributed among the downstream feeders. However, for a connected system it would not be possible.

For the study of capacitor requirement for 2018-19, it was proposed to conduct the study at 11kV/33kV level in order to obtain more feasible and practical requirement of capacitors in case the system at 220/132/66kV was not radial. However, if the system is radial, then the requirement of capacitors assessed by the CPRI may be proportionately translated upto 11kV level. States informed that most of the system is radial. Therefore capacitors study could be done as per original proposal of CPRI for 2018-19 also.

140th OCC meeting: In the meeting representative of UP (SLDC) again raised the issue of the quantum of capacitor banks incorporated in the study by CPRI. EE (O), NRPC intimated that the comments of UP has already been sent to CPRI and further suggested that the utilities could also take up the issue directly with the concerned personnel in CPRI (Dr. Manohar Singh, Mob No.– 9632940855, E-mail: manoharsingh@cpri.in ).

Regarding the study of capacitor requirement for 2018-19, they plan to conduct their own study for assessing the capacitor requirement considers actual data of power factor and MVAR injection of load at the 33 kV level and other factors such as generator directly connected at 33 kV voltage level etc. In addition to above mentioned installed capacitor banks 439.39 MVAR (81Nos. X 5.43MVAR) more Capacitor banks are already under installation.

142nd OCC meeting

All the Utilities were requested to submit the action plan for the installation of the capacitor banks as per the outcome of the study conducted by CPRI by 31.12.2017.

For study of the period 2019-20:

37th TCC/40th NRPC meeting:

The issue of study for 2018-19 was discussed in the 37th TCC/40th NRPC meeting. In the meeting it was proposed to conduct the study in two stages:

i. One at 220/132 kV level

ii. Subsequently down to 66/33/11 kV level As it would involve a huge task of collection of data it was also agreed to conduct the study of capacitor requirement for 2019-20 in place of 2018-19.

NRPC approved the proposal for conducting the study of capacitor requirement for 2019-20 at 11kV/33kV/66kV level and also for the additional charges which may be levied by CPRI for conducting the study to be paid from NRPC fund.

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141st OCC meeting:

Members were briefed about the decision of NRPC for conducting the study for 2019-20 at 11/33/66 kV level. All the utilities were requested to timely submit the data for their network for successfully conducting the study.

142nd OCC meeting:

NRPC Secretariat is in the process of getting the proposal from CPRI for the additional scope of work as approved by the 40th NRPC.

Members noted the same.

8. Phase nomenclature mismatch issue with BBMB and interconnected stations During the discussions held in 34th PSC meeting, it was reported that phase sequence of

BBMB at the interconnection with other utilities, do not match. It was observed that it leads to confusing situation while charging of interconnected lines and also in other coordination problem while reporting an issue.

While deliberating it was observed that, the main issue was primarily of the nomenclature of phases at BBMB end

In view of the above BBMB was asked to rectify the nomenclature issue at their end which leads to coordination and other problems while reporting.

138th OCC meeting & 139th OCC meeting: BBMB representative informed that the issue of mismatch of phases is being looked into and would be rectified at the earliest. 140th OCC meeting: The representative of BBMB informed that a committee has been constituted by TS organization of BBMB. BBMB submitted the report (Annexure –Agenda 8) of the committee providing the details of the prevailing conditions at respective ends of BBMB and other utilities connected to them. The present situation as stated in the report is as given below:

Phase of the grid Corresponding nomenclature of the phase at BBMB end

R Phase B Phase

Y Phase R Phase

B Phase Y Phase However, the report of the committee does not mention the action taken or proposed to be taken by BBMB in order to rectify the issue of phase nomenclature mismatch. 142nd OCC meeting: SE (O), NRPC stated that the findings of the report details only about the prevailing conditions at the interconnection points and does not mention remedial action for rectifying the same.

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Representative of BBMB stated that the issue involved was only of the nomenclature of phases which would not lead to any technical problem. He brought up to the sub-committee the various problems which would be faced in order to change the nomenclature (color coding, ferruling etc.) in the already established infrastructure.

Citing the coordination and other operational problems because of this mismatch of nomenclature, BBMB was directed to widely circulate the findings of the report (Annexure –Agenda 8) to all their interconnected utilities. BBMB was also directed to display the phase nomenclature of BBMB and their corresponding phases in the grid at their Switchyard and Control Room. Also they were advised that while reporting any issue, the phase nomenclature of the grid and that of BBMB shall be clearly mentioned in order to avoid any misinterpretation.

9. Operation of hydro power projects in peaking mode

POSOCO has carried out operational analysis of various hydro stations in the country and observed that despite 40.6 GW of peaking hydro capacity, only about 33 GW peak generations is carried out on all India basis. According to POSOCO, this is on account of a number of hydro stations, particularly in state sector, which are not being operated in peaking mode. In order to examine the above observation, a sub-committee has been constituted by the MoP under Chairperson, CEA with heads of POSOCO, NHPC, SJVN & THDC as member and Director (H), MoP as the member convener. The sub-committee has held three meetings with the concerned hydro generating stations and concluded that there is scope for about 2000 MW additional power generation from hydro stations during peak hours. Based on the deliberations at the meetings of the Committee, Chairperson, CEA has advised to discuss the above operational analysis & the matter of utilization of hydro stations in peaking mode be discussed at the monthly OCC meetings while discussing operational planning for the month ahead and analyzing the operation in the previous month.

In the meeting all members were advised to go through the report on the https://posoco.in/hydro-committee-report/ and then submit the comments on the issue in the next OCC meeting.

In the 142nd OCC meeting the NHPC gave their comments as under:

NHPC has already submitted its comment to CEA. It was explained that the Parbati-III Power Station has already given Peak support during monsoon period. However during lean period, Parbati-III is declaring its total energy for the day and scheduling is accordingly being done by NRLDC for one and half hour, each during morning and evening peak as per CERC order considering non availability of inflow of Parbati-II. It was further explained that NRLDC can schedule Parbati-III limited to the total declared energy, without affecting the PAF.

In the 142nd OCC meeting other utilities were once again requested to give their comments on the issue

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10. Targets fixed for Load Relief from operation of df/dt & UFR relays in Haryana-review thereof (Agenda by Haryana)

Haryana has different loading pattern for different crop harvesting systems. Target load relief for the state of Haryana has been fixed as 2843MW (UFR: 1243MW,df/dt: 900MW,SPS: 700MW) at NRPC level. This target had been fixed by considering the maximum demand of 6725MW in 2012-13.

However, the maximum load of state comes out during summer season and the target as stipulated above could only be achieved during peak summer season. During off peak season, the target load relief could not be provided as the average off peak load of Haryana state remain between 2800-3500MW and minimum load of state was even recoded as low as 1600 MW during the last winter season which was approximately half of the targets fixed.

In case of Haryana, target load relief of 2843MW has been fixed under different defense mechanism by considering peak load demand of 6725 MW of 2012-13 and making it applicable throughout the year. However, the same quantum was taken even for the off-peak Period when the state experiences average load of 2800-3500MW for 6-months (i.e Jan-April & Nov-Dec) & min. load of around 2000-2300MW.

Clause 5.4.2(e) of IEGC mandates the arrangement of Interruptible load in 4 groups (excluding Un-interruptible load) in the following way:

1) Interruptible Load:- (i) For Scheduled power cuts (ii) For un-scheduled cuts (iii) Essential load of Hospitals, Airport, Railways etc. is additional.

2) Uninterruptible Load:- (i) Sanctioned Load of continuous process industries. (ii) Essential load of Hospitals, Airport, and Railways etc. is additional. It also mandates that there should be on overlapping between different groups of load. Accordingly, by excluding un-interruptible load(Average running load of Continuous process Industrial load & substantial amount of airports, Railways & Hospitals load), targeted load relief of 2843MW cannot be achieved during off-Peak period of 6 months (i.e Jan-April & Nov- Dec ) in Haryana Control Area even by putting all the balance state under defense mechanism. It is therefore requested to review the target fixed for UFR & df/dt for Haryana State keeping in view the off peak load of the State during winter season. 141st OCC meeting: It was intimated that the data required for reviewing the target load relief had been received from all utilities except PTCUL. PTCUL representative stated that the requisite data would be submitted at the earliest. SE (O), NRPC stated that the review of the load relief for all the states was very essential keeping in view the request of HVPNL& PSTCL.

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142nd OCC meeting: Representative of Uttarakhand SLDC informed that the concerned organization of PTCUL was being regularly asked to provide the data however no response was obtained from their end. EE (O), NRPC advised Uttarakhand SLDC to mark a copy of the letter to NRPC while sending the same to concerned organization of PTCUL and if no response is obtained from their end the issue could be taken up directly at NRPC level.

11. Follow up of issues from previous OCC Ms – Status update

The detail of the Agenda points on which status update is required was enclosed at Annexure 11 of the Agenda of the 142nd OCC meeting.

All utilities were requested to update the status before 25.12.2017.The duly updated Annexure 11 is enclosed with.

12. RIHAND STAGE III ISSUES (AGENDA BY NTPC)

Rihand stage-III (2x500MW) units have now been switched over to western region by connecting them at Vindhyachal Pooling Station on 28th Nov' 2017. After disconnection of Rihand Stage-III from northern grid, guidance on following points is needed: 1. In case of western grid failure, what will be the start up procedure for Stage-III Units? 2. In case of northern grid failure, can start up power be taken from Stage-III after closing Bus Coupler 3 & 4 (Connecting Stage-II to Stage-III)? 3. When one line to Pooling Station is under Shut down, what should be the status of auto re-closer of other line? OCC Members discussed the issue. NRLDC representative intimated that the Grid restoration procedure is under review by them and the procedure required after disconnection of Rihand Stage-III from northern grid will be included in it..

13. High voltages in the Grid:

NRLDC representative stated that high voltages are continuously being observed throughout the Northern grid for major part of day and it further escalates during night hours due to light load condition making grid operation in alert situation. Various plan & actions to mitigate such high voltage have already been deliberated in regular OCC/TCC and winter preparedness meetings. Despite all the continuous efforts, still very high voltages are being experienced during day/night hours.

Following actions were highlighted by NRLDC representative which have been & would be helpful in improving the grid operation:

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a. Reactor utilization: Static voltage regulation i. Updated list of Bus reactor, its availability and data at control centers shall be

ensured. NRLDC is having list of B/R that can be taken in service during night hours. Further, it was requested to all utilities to keep updated list so that in case of high voltages, all available B/R are taken into service using the list.

ii. Update list of lines whose line reactor can be switched as bus reactor on opening of such lines. List of lines wherein there is a provision of such switching though confirmation from the respective utility is pending is attached at Annexure-I. This data is made available to NRLDC control room operators which are then utilized as per real-time scenario. Thus, respective constituents were requested in the meeting to confirm the same as soon as possible to make the data available for better utilization of resources as this data is pending since long time.

NRLDC representative stated that monitoring of data of one or two night shifts indicates that at some places where LR can be used as BR on opening of that line are not actually being taken into service. Graphs of such lines for that date were presented in the meeting. Few of lines discussed were:

1. 765kV Agra-Fatehpur D/C at Fatehpur end- Powergrid representative stated that L/R at Fatehpur end are ready & would be taken into service in future.

2. 400kV Jalandhar-Kurukshetra at Jalandhar end –Powergrid representative stated that the reactor would be taken in service in future.

3. 400kV Nallagarh-Rampur D/C at Nallagarh end –Powergrid representative stated that the reactor would be taken in service in future.

4. 400kV Agra-Jaipur D/C at Jaipur end. 5. 400kV Bhadla-Bikaner at Bikaner end.

It was further stated that this list is not exhaustive; all utilities shall ensure utilization of all L/R as B/R. POWERGRID representative stated instructions have been issued to all field offices to use the line reactor as bus reactor after line opening. Minor issues at one or two places have been taken care of or would be taken care of immediately.

It was agreed that all utilities shall provide details of lines wherein there is a provision of switching of line reactor as bus reactor on opening of such lines which has been asked since long time. Utilities were requested to verify data available in NRLDC Reactive power document and provide their comments/ suggestions regarding which L/R can be used as B/R. Further, it was requested to sensitize system operators about utilisation of L/R as B/R when high voltages are being observed especially during night hours, wherever possible with consent of NRLDC accordingly. All utilities including POWERGRID agreed to direct their field officers again for utilisation of line reactor immediately.

b. Absorption of MVAr by Generator: Dynamic voltage regulation

i. NRLDC representative presented that for most of the generators, either the absorption of MVAr was not adequate as per the capability curve or the

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telemetry of MVAr data was not accurate. Response of some of the thermal/gas machines for the month of Nov’17/Dec’17 was presented in the meeting and is attached as Annexure-II. Plots provided by NTPC and Punjab were also presented. The fact that SCADA data measures from HV side of GT thus, actual MVAr absorption by the generator would be lesser than as observed from the plots was also presented by NRLDC representative.

Generating station

Reactive absorption

Rihand Absorbing upto 600 MVAr (Data needs check) Singrauli Absorbing upto max 200 MVAr, more margin available Dadri-Th Generating and absorbing in range of 300 to -200 MVAr (Data not

reliable), plots provided by NTPC also show that machine generating MVArsfor most of the time

Jhajjar Absorbing -50 to 400 MVAr Faridabad Gas Absorbing 50 to 200 MVAr, plots provided by NTPC also show

that machine absorbing MVArs for most of the time Unchahar Absorbing and generating -100 to 100 MVAr Anta Absorbing 100 MVAr (Data does not seem reliable) Auraiya 500 to 600 MVAr absorption, Data not reliable Dadri gas Absorption upto 100 MVAr Anpara-C Generating & absorbing MVAr (from -50 to 150 MVAr) Bara TPS Absorbing 50 to 150 MVAr (Data need check) Lalitpur TPS Generating MVAr most of the time Rajpura TPS Absorbing 200 to 450 MVAr Talwandi Saboo

-100 to 100 MVAr, as per data lot of margin is available, although data needs to be checked, Capability curve plots also shown

CLP Jhajjar Absorbing 50 to 250 MVAr Kawai TPs Generating & absorbing MVAR (from -150 to 100 MVAr)

NRLDC representative stated that machines should absorb more MVAR according to their capability curves. Most of machines have sufficient margins available considering performance as per their limits. NTPC and Punjab have started to plot generator MVAr v/s voltage plots using their SCADA data and have shared the same. Other generation utilities were also requested to plot & share MVAr v/s voltage plots for their generators to check actual absorption. It was also stressed that telemetry of MVAr data from most stn.s is not reliable and hence, utilities shall ensure correct telemetry of data. In the meantime they shall share plots from their station SCADA for night period. . All members agreed for the same.

ii. Synchronous condenser operation: Synchronous condenser operation of machines was discussed in the meeting:

a. Tehri Unit#1 &2: NRLDC representative informed that trial testing of unit#1 & 2 for synchronous condenser operation has been done on 30.11.2017. As per discussion with THDC, only one unit can run in synchronous condenser mode at a time. It was informed that two hour limitation would not be there this time but another limitation is seen i.e. of closing the synchronous condenser at least two hour before station is to be brought in generation mode due to compressor

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issues. Telemetry issue for Tehri station was raised by NRLDC which makes data monitoring difficult especially synchronous condenser mode of operation. Plots of Koteshwar bus voltages and line MVAR showing synchronous condenser mode of operation are also attached in Annexure-II. NRLDC requested THDC to look for solutions to the issues being encountered while operating in synchronous condenser mode so that it can be utilized more for the benefit of grid.

b. Chamera-2: NHPC representative stated that Chamera-2 would be ready to operate in synchronous condenser mode after Feb’2018.

c. Pong (BBMB): Pong units have been used for synchronous condenser mode of operation for dynamic voltage regulation. Graph of Pong for Nov/Dec’17 showing MVAR absorption throughout its operation i.e. not just synchronous condenser mode of operation is enclosed in Annex-II.

d. RSD (Punjab): Punjab is yet to confirm the testing of RSD unit in synchronous mode of operation.

e. Uttarakhand representative stated that Shravanti gas station has expressed inability to operate in synchronous condenser mode.

c. Reactive Power injection at ISTS nodes:

NRLDC representative presented the following: i. As per NRPC REA account, the nodes that are injecting MVAr into the grid at high

voltages and need actions are highlighted below.

State control area

MVAr Injection at 400kV on High voltage (>1.03pu) as per NRPC REA for weeks of NOV 2017

Punjab Ganguwal, Gobindgarh, Barnala, Ropar, Amritsar (PG), Moga(PG), Jalandhar, Jamsher, Sarna

Haryana Bahadurgarh, Gurgaon, Deepalpur, Bhiwadi, Hissar, Fatehabad

Rajasthan Hissar, Khetri, Bhinmal, Heerapura, Kankroli, Jaipur South & Sikar

Delhi Bamnauli, Mundka, MaharaniBagh, Narela, BTPS, Bawana Uttar

Pradesh Anpara, Mainpuri(PG), Panki, Rosa, Kanpur

H P Jassore

ii. Some 400/220kV ICT nodes where MVAr is being injected from 220kV to 400kV system were presented in the meeting and are shown below:

State 400/220kV nodes where 220kV nodes is injecting MVAr to 400kV nodes

Punjab Dhuri, Nakodar, Moga, Patiala, Ludhiana, Jallandhar Haryana Dhanoda, Bahadurgarh, Fatehabad, Hisar Rajasthan Bhinmal, Kankroli, Kota, Suratgarh, Heerapura, Sikar,

Jaipur South, Jodhpur Uttar Pradesh

Auraiya, Kanpur

Delhi Bamnoli, Bawana, Mundka

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Plots showing MVAr flow from 220kV side to 400kV side for above nodes were attached as Annexure –III in OCC agenda and also presented in the meeting. It was requested that underlying network at these nodes shall be monitored vigorously and capacitors etc. at low voltage level may be switched off & lines which were generating high MVARs may be opened after considering reliability and security of the grid to avoid unnecessary injection of MVARs from 220kV side to 400kV side and reduce high voltages in the grid. This action of utilities will also help in reduction payment by them in reactive energy pool.

d. Tap optimization

NRLDC representative stated that at 400kV & above, tap optimization based on simulation studies, Scatter plots of SCADA data of HV/LV nodes was suggested and incorporated by RLDC/NLDC. The suggested list for changing tap this winter was shared in 140th /141st OCC meeting. Taps at most of stations have been optimized at 400/220kV voltage level. While changing tap positions at 400 kV Jodhpur, during Tap changing it was found that Gear mechanism of OLTC (on-line tap changer) (BHEL make) was getting stuck, thus tap change could not be performed. Further, Delhi SLDC informed that 220KV Stns. fed from 400KV Maharani Bagh i.e. 220KV Masjid Moth, HCM Lane, Trauma Centre are experiencing high voltage >240KV in night hours. Also 220KV S/Stns. fed from 400KV Bawana i.e. 220KV Rohini, Rohini-2, Shalimar Bagh, Kanjhawala, DSIDC are already experiencing high voltage up to 240KV in night hours. Thus, on request of Delhi SLDC tap positions at these stns were not increased as this would have further increased voltage on 220kV side. However, since 400 kV voltages are also very high and Delhi has to pay for reactive power injection, Delhi was requested to plan for long term solution i.e. installation of bus reactors in the system. OCC agreed that as requested earlier SLDC should also optimize their tap at 220kV and below voltage level based on scatter plots and off-line studies; share their studies in this regard & update progress of above in next meeting.

e. Opening of lines:

NRLDC representative informed that it has been opening EHV lines as last resort to regulate the high voltage especially during night hours. Factors based on which lines are being opened are sorted & listed below considering reliability as major criteria: i. Long parallel lines whose Line Reactor can be switched as BR

ii. Line that give High MVAr/Voltage relief iii. Parallels line emanating from Hydro station (Hydro station usually closed during

night hours) iv. Long parallel lines whose loading is under 20-25%during night hours

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OCC requested States to consider opening lines of lower voltage levels, if all other resources have been used up using above criteria at the time of high voltages in the grid after taking into consideration system security & reliability.

14. Over-voltage nodes NRLDC representative stated that even after utilizing all the available resources to curb high voltages, some of the nodes experienced high voltages for most duration in Nov’17 which are listed below.Voltage duration curve of Sep-Nov’17 for these nodes were attached in agenda as Annex-IV.

S.N

o State Nodes ( % of time above 420kV) in Nov’17

1 Punjab Amritsar(46%), Jallandhar(90%), Dhuri (80%),Rajpura (94%),Makhu (86%), Talwandi Saboo (90%), Nakodar(76%)

2 Haryana Bhiwani (59%), Nuhiyawali(50%), Dehar(56%), Kabulpur(60%), Abdullapur(56%), Mahindergarh (92%), Panchkula(49%), Khedar (70%)

3 Rajasthan Bhiwadi(54%), Suratgarh (72%),Jodhpur(55%) 4 Delhi Harsh Vihar(53%), Mandola(48%), MaharaniBagh(52%) 5 Uttar

Pradesh Agra (96%),Fatehpur (75%), Mainpuri(55%), Paricha (60%), Muzaffarnagar(60%), Lucknow(UP)(56%)

6 HP Nallagarh(61%) 7 Hydro/Ther

mal (ISGS)

Banala(38%), Karcham Wangtoo(65%), Jhakri(50%), Rampur(75%)

Thus, need of resources for more MVAr absorption at these nodes was expressed by OCC. Further, quarterly feedback regarding the same is being given by NRLDC to NLDC which is further forwarded to CTU and CEA. At Harshvihar, as reported by Delhi SLDC, multiple elements tripping took place on 26.11.2017 at 220kV voltage level on overvoltage. Thus, on request of Delhi SLDC and after studying of case by NRLDC, it was decided to reduce tap position of 400/220kV Harshvihar ICTfrom 9 to 7 on 5th Dec 2017. But, this has increased MVAr flow from 220kV side to 400kV side, thus increasing 400kV voltage and increasing reactive energy charges payable by Delhi. NRLDC suggested that voltage regulation support for such nodes should be planned for long term i.e. installation of Bus reactor or other dynamic voltage support. Further, as overvoltage setting at 220kV level is generally not being used. Delhi SLDC was requested to share the detailed report on tripping giving details of practices used for overvoltage /Overflux protection settings at these nodes and in entire Delhi control area.

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15. 400kV and above transmission lines without polymer insulator and its cleaning

progress:

NRLDC representative stated that EHV lines tripping in winter during fog has been experienced since many years and it has been suggested to regularly clean lines before winter and to replace the porcelain insulator to polymer insulators. Progress on remaining lines whose insulators are yet to be cleaned/changed was requested to be shared by transmission licenses/STUs.

For monitoring of polymer insulator replacement and cleaning of conventional insulator, one meeting was held on 14th Nov 2017. Status of polymer insulator replacement was discussed during the meeting and utilities were asked for submission of the details. After the meeting, details were received from POWERGRID and Adani. List of the transmission line without polymer insulator was attached as Annexure-V in OCC agenda. Other utilities were requested to forward details at the earliest.

CTU had awarded the contract of Pollution Mapping for NR to CPRI. CPRI report in this respect was submitted and discussed in NRPC meeting. It was also decided that new lines coming in pollution stretch and in fog prone areas shall be designed with polymer insulators.

Despite above, new lines have been commissioned with conventional insulators in NR. NRLDC presented the recent frequently tripping lines and also mentioned the importance of some of lines from reliability perspective (list of such lines attached at Annexure-V in OCC agenda). OCC decided that all utilities shall look into the pollution condition around these lines and shall prioritize Polymer Insulator replacement if required to avoid frequent tripping of lines.

All utilities agreed for the same.

High MVAr injection

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16. Upcoming reactors in coming month Reactors that are expected to be commissioned in present/upcoming months were discussed and status provided by respective utilities for the same are listed below.

Merta reactor is expected within few weeks. Hindaun reactor is expected by Jan 2018. Chamera-I reactor HV test is pending, is expected after Jan 2018. Parbati-II reactor is under tendering stage and is expected to take time. Parbati-III reactor is not expected and was dropped due to space constraints. Dadri reactor is expected only after March 2018 as presently foundation works are

going on. Jhakri reactor is also expected after March 2018.

OCC appreciated efforts put in by utilities and asked them to commission reactors on priority.

17. New element in Uttar-Pradesh control area NRLDC representative stated that underlying network at nodes mentioned below have not been/ partially commissioned even though sufficient time has past since commissioning of these stations. Underlying network at these nodes may also be commissioned on priority so that load may be transferred from some stations which have high loading of lines and ICTs and this could help in reducing N-1 violations at these stations. UP representative stated that work is under progress in full swing at all stations and full efforts are being made for commissioning of underlying network.

400/220kV Dasna- commissioning of underlying network would take time 400/220kV Ataur- commissioning of underlying network is under progress 400/220kV Aligarh- more220kV ckts are expected within 1-2 months 400/220kV Sikandrabad 400/220kV Indrapuram- LILO of Sector62- Sahibabad is being done. 765/400kV Mainpuri 765/400kV Greater Noida 765/400kV Hapur 400/220kV Mathura 400/220kV Banda 400/220kV Gonda 400/220kV Orai

UP representative further stated that severe ROW issues are being encountered in most cases and administrative officials are also being involved to speed up the work.

18. Shifting of Rihand-III to WR NRLDC representative stated that Rihand-III (Unit#5 & 6) has been shifted from NR to WR on 28th Nov 2017 by connecting through Rihand(III)-Vindhyachal PS 2X S/c lines as decided in 29th Standing committee meeting of WR to shift it after commissioning of HVDC Champa-Kurukshetra bipole which is operational since Sept 2017.

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Based on the studies it was decided that synchronization shall be done when angular separation between Rihand and Vindh. Pool is within 3 degrees, with Rihand bus leading because power was supposed to flow from NR(Rihand-III) to WR(Vindhyachal). In order compute the angular separation b/w Rihand & Vindhyachal buses in real time a monitoring display was created using following PMU data:

PMU on 400kV Vindhyachal-Sasan Ckt-1 at Vindhyachal PS PMU on 400kV Rihand-Rihand HVDC Ckt-I at Rihand.

Fig. below shows connectivity in and around Rihand-Vindhyachal region. In the run up to the shifting through procedure, NRLDC had requested NTPC to ensure that Rihand Stage-III auxiliaries are shifted from station transformer of Stages-I and II (if such an arrangement exists) to Unit Auxiliary Transformers of Stage-III or Stage-III station transformers. Any auxiliary of Stage-1 and Stage-2 shall be shifted out from stage-III station transformer to their respective UAT or Stage-1/Stage2 station transformer. Lines were idle charged from both ends one by one to ensure that lines and terminal equipment’s are healthy. Confirmation regarding protection setting and PLCC tuning were taken from both ends. First Synchronization was attempted on 27th-Nov-2017. Lines were charged from Vindhyachal PS end. However lines could not be synchronized at Rihand Stage-III end because of problem with the synchronizing trolley at NTPC Rihand end (Voltage signals was not coming in the Synchronizing trolley) hence exercise was aborted.

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Second attempt was initiated on 28th-Nov-2017. 400kV Rihand (III)-Vindhyachal PS Ckt-1 was idle charged from Vindhyachal PS at 12:06Hrs/28.11.20.In order to reduce the angular separation between two nodes following actions were taken.

HVDC Champa-Kurukshetra Bipole power flow was increased (WR to NR) from 500 MW to 1000 MW.

HVDC Vindhyachal back to back power order was changed from 100 MW (NR to WR) to 250 MW towards NR to make angle near to zero between Rihand and Vindhyachal PS about 0.25 degree. (Vindhyachal HVDC Pole-II under shutdown).

Power order on HVDC Rihand-Dadri was reduced Generation in Rihand was increased RRAS down of 100 MW given to Vindhyachal Stage-IV.

The impact of these actions on the angular separation is illustrated below.

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NRLDC representative requested NTPC to check transducer at Vindhyachal end as there was huge mismatch in MVAR. Plot below shows voltage variations at Rihand & Vindhayachal PS along with angle difference between Rihand bus (which remained connected to NR) and Vindhyachal PS. Just prior to synchronization of 400kV Rihand (III)-Vindhyachal Ckt-II difference in bus voltage of 400 kV Rihand and Vindhyachal PS was 7 kV and Rihand Stage-III units were absorbing MVAr. After synchronisation of machines and opening of bus sectionaliser, the voltage difference led to sudden rush of 157 MVAr towards WR and Rihand units started generating the MVAr (Perfect operation of AVR). This resulted in sudden voltage dip of about 4-5kV at Vindhyachal PS and VSTPS Stage-IV.

Shifting of Rihand Stage-III units (Unit No-5, 6) in the online mode was successfully executed with coordination between NLDC, NRLDC, WRLDC, RTAMC-Vadodara, NTPC, and WRTS-II. NTPC reported regarding problem of excessive vibrations in GTs of Rihand stage 3 when Rihand Dadri one pole was operating in ground return mode. In case of stage I and II Units, there are 12 GTs and 2 IBTs connected in parallel so current is getting distributed & effects are minimized but in Stage III only 06 GTs are in parallel & its effect is more pronounced. NLDC representative stated that similar issues were encountered in Talcher-Kolar where ground return issues are also there due to rocky surface and resistors were inserted in neutral side, but it could not improve the performance. NLDC have forwarded letter to CTU regarding the same and asked them to share their experiences and assist for studies in this regard. NRLDC requested NTPC for old data of time when only few units of Rihand (say Rihand-I/ Rihand-II) were commissioned and Rihand-Dadri HVDC bipole had operated in monopolar operation. How were vibrations during that time? NRLDC also asked about grounding resistance difference of stage-1 and stage2 and that of stage 3. NTPC representative informed that they would get assessment of earthling system at Rihand soon.

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NTPC representative asked that in case of western / northern grid failure, what will be the start up procedure for Rihand-I, II & Stage-III Units. NRLDC representative stated that in case of failure of any of western/ northern region normalisation process may be started with extension of power using AC bypass link at Vindhyachal BtB and also by using bus coupler at Rihand after taking consent of NRLDC. However, after considerable normalisation of system, the bus coupler as well as AC bypass would be opened. Further, NTPC representative asked when one line to Pooling Station is under Shut down, what should be the status of auto reclosure of other line. NRLDC representative stated that auto reclosure of other line may be kept ON as similar practice is being used at most places where only two lines are available for evacuation to avoid unnecessary tripping of generation. Since, Rihand-III is now connected to WR, outage of lines would be taken care by NLDC in consultation with NRLDC and WRLDC and if constraint is observed in Vindhyachal complex, then curtailment would be done for Rihand-III as would be done for Vindhyachal complex.Scheduling of Rihand-III would continue to be done by NRLDC. 19. Monitoring of Fog Using satellite Picture NRLDC representative gave presentation on "Monitoring of Fog Using satellite Picture". The different types of Satellite Images available in Portal were explained. Monitoring the real time development of FOG using Color composite images was explained in detail. Differentiating between Fog & cloud was shown using the satellite Image. Identification of developed cloud in Satellite Images was also explained. 20. Load Forecast

In line with CERC compliance and decision taken in OCC/TCC, each state control area has started sharing its forecast on daily basis to NRLDC. The comparison between forecasted & real time data is made available at NRLDC Control Room for use of System operator. However, it has been found that, the load forecast data shared by states is not regularly updated, especially on Saturday & Sunday. Irregularities in Load forecast data shared by State was shown & all the states were requested for updating the data on regular basis. The RMSE chart for first 01st Dec to 07 Dec 2017 was also shown & suggested for further improvement. 21. Deviation by NR states NRLDC representative stated that Rajasthan is reducing its load abruptly by ~500MW at 04:00hrs mark and increasing load by ~1000MW at 06:00hrs which leads to excursions in grid frequency. It has been communicated on no. of occasions & is also well known that all states shall try to increase/decrease load gradually especially at hourly boundary marks so as to avoid frequency excursions in the grid. Further, frequency is on higher side from 21:00hrs to 22:00hrs and Rajasthan is taking in service load just after 22:00hrs. Rajasthan can gradually increase load from 21:00hrs upto 22:00hrs instead of increasing abruptly at 22:00hrs. as this would only improve frequency profile and reduce overvoltage in the grid. Rajasthan SLDC said they are continuously persuading DISCOMs to limit over drawl, but still Over drawl is still continuing. Rajasthan, Haryana, UP and Uttarakhand had overdrawl for most of the time when frequency remained on the lower side from 06:00hrs to 18:00hrs on most days of the month. Pattern appears to be repetitive overdrawing for most of the days instead of having overdrawl/underdrawl over the period. NRLDC representative asked states to keep

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more machines on bar so that if sudden increase/ decrease in load is there, it can be easily compensated using available state generation without violating their drawl limits. Most of the states are deviating from their schedule. Therefore, SE NRPC advised all states to limit their over drawl and under drawl as it results in poor frequency profile as well as deviation charges to the states. Constituents were asked to take remedial measures to arrest such deviations in future. 22. Reliability issues Reliability issues related to Rajasthan and Jammu & Kashmir were presented in the meeting. Rajasthan: N-1 non-compliance was reported at 400/220kV ICTs of Jodhpur, Merta and Sikar. High loading of 765/400kV Phagi ICTs was also discussed. Rajasthan state was requested to carry out studies and rearrange feeding of loads such that high loading of these ICTs may be avoided. Jammu & Kashmir: N-1 non-compliance was reported at Wagoora. High MW and high MVAR loading was observed throughout the month. N-1 non-compliance of 220kV Wagoora-Ziankote and 220kV Wagoora-Pampore was also observed. It was requested for early revival of 220kV Kishenpur-Ramban so that loading at Wagoora ICTs is slightly reduced. 23. Frequent forced outages of transmission elements

The following transmission elements were under frequent forced outages during the month of Nov’17:

S. NO. Element Name No. of forced

outages Utility

1 400kV Aligarh(UP)-Sikandrabad(UP) ckt-2 6 Uttar Pradesh

2 HVDC Champa(WR) - Kurukshetra(NR) line-1 6 POWERGRID 3 HVDC Champa(WR) - Kurukshetra(NR) line-2 6 POWERGRID

4 400kV Dhuri(PSTCL)-Talwandi Sabo(PSTCL) ckt-2 6 Punjab

5 400kV Dhuri(PSTCL)-Talwandi Sabo(PSTCL) ckt-1 5 Punjab

6 400kV Nakodar(PSTCL)-Talwandi Sabo 5 Punjab 7 400kV Mukatsar(PSTCL)-Talwandi Sabo ckt-2 4 Punjab 8 400kV Moga(PG)-Talwandi Sabo 4 Punjab 9 400kV Bikaner(RVPNL)-Deedwana(RRVPNL) 4 Rajasthan 10 400kV Aligarh(UP)-Sikandrabad(UP) ckt-1 4 Uttar Pradesh 11 400kV Agra(PG)-Jaipur South(PG) ckt-2 4 POWERGRID

The complete details are attached at Annexure-VII of 142nd OCC Agenda. It could be seen that issues like no auto-reclosing, mal-operations, HVDC protection operation, delayed clearance of fault are observed in most of the cases. The frequent outages of such elements affect the reliability and security of the grid.

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POWERGRID representative explained the reasons of tripping of HVDC Champa-Kurukshetra and stated that remedial actions have been taken. He emphasized that now onwards tripping would reduce as software issues have been taken care of. Punjab representative informed in 142nd OCC meeting that frequent tripping of 400kV lines were due to early onset of fog. Insulator cleaning was already planned after 30th Nov 2017 but tripping occurred before it. From next year early cleaning would be planned. Representative of UP told that there are slaughter house around 25km from Aligarh. Due to slaughter house large number of birds are flying in the sky and it leads to tripping of 400kV Aligarh-Sikandrabad ckt-1 & 2. Birds guard installation is under process and would be completed with 2-3 months. Rajasthan representative ensured to take action to prevent the tripping of 400kV Bikaner-Deedwana line.

It was discussed and deliberated in various OCC meeting that the frequent outages of such elements affect the reliability and security of the grid. OCC advised concerned Utilities to look into such frequent outages and take the remedial measures in this respect to avoid tripping in future.

OCC advised all concerned utilities to submit the remedial action taken report for frequent tripping of aforesaid elements. It is once again requested to all the concerned utilities to submit the details within 15days.

24. Multiple element tripping at 400kV Panki(UP) station during relay testing work: At 16:42hrs of 16thNov 2017, during relay replacement work at 400kV Panki end of 400kV Panki-Aligarh ckt, bus bar protection operated at 400kV Panki (UP) substation. It resulted into tripping of all elements connected at 400kV voltage except 400kV Panki-Kanpur ckt-1. The following PMU plot of Kanpur voltage is showing no fault in the system.

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During this event, 400kV Panki-Unnao ckt, 400kV Kanpur-Panki ckt- 2, 400kV Panki-Aligarh, 400kV Panki-Rewa Road and 400/220kV 240MVA ICT-1 & 2 at Panki (UP) tripped. 400kV Panki (UP) substation has DMT bus scheme in which the tripping of both the buses is doubtful. Preliminary report has been received from UPPTCL but detailed report along with DR/EL is still awaited. Extract of the report:

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Following are the points of concern:

Operation of both bus bar protections during relay operation for 400kV Panki-Aligarh ckt at Panki end.

Non-tripping of 400kV Kanpur-Panki ckt-1 from Panki end during bus bar protection operation. Earlier during the incident of 2nd Nov 2017, similar situation arose whereas 400kV Kanpur-Panki ckt-1 was not tripped during bus fault.

Is procedure for VAJC (CT selection) relay replacement followed during relay replacement work at 400kV Panki (UP).

Remedial measure to reduce mal-operation during testing and commissioning. Frequent tripping observed at 400/220kV Panki (UP) station. Tripping details is tabulated below:

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UPPTCL may kindly look into the multiple element tripping and share the DR/EL and detailed report along with remedial measures taken and to be taken for this tripping and tripping mentioned in the above table. NRLDC representative informed that two incident of complete station outage of Panki (UP) station occurred within 15days. It is cause of concern and needs to be addressed immediately. Action shall be taken immediately. On 2nd Nov 2017, 3-phase dead fault occurred at Panki (UP) and it was near miss event. On 16th Nov 2017, complete station outage occurred without any fault in the system. UPPTCL representative informed that action was already taken after 2nd Nov 2017 incident and pending internal audit would be completed within 15days and report would be submitted to NRPC/ NRLDC. Action Points:

UPPTCL shall organize the internal Audit of 400/220kV Panki (UP) and submit the audit and action taken report within 15days.

All the NR utilities kindly take action to prevent the human error because it leads to complete station outage in the system.

All the NR constituents follow the procedure for maintenance and replacement activities.

UPPTCL shall submit the detailed report along with DR/EL and action taken report within 7days.

Element Name Type Voltage Level Owner Outage_date Outage_timeRevival_date Revival_time Reason / Remarks

Muradnagar-Panki Line 400 kV UPPTCL 13/06/2014 20:44 13/06/2014 21:08 Others

Panki-Unnao Line 400 kV UPPTCL 13/06/2014 20:44 13/06/2014 21:19 Transient fault

Panki 240 MVA ICT 1 ICT 400/220 kV UPPTCL 28/03/2015 17:11 28/03/2015 19:15 LA of ICT-1 burst at panki.

Panki 240 MVA ICT 2 ICT 400/220 kV UPPTCL 28/03/2015 17:11 28/03/2015 18:50 ICT -1 LA burst at panki.

Kanpur(PG)-Panki(UP) 1 Line 400 kV PGCIL 30/01/2016 5:53 30/01/2016 7:08 Tripped on High voltage

Allahabad Rewa Road(400kV) - PankiLine 400 kV UPPTCL 30/01/2016 5:53 30/01/2016 8:18 Phase to earth fault

Kanpur(PG)-Panki(UP) 2 Line 400 kV PGCIL 10/3/2016 14:25 10/3/2016 17:54 Bus Bar-B protection operated at Panki

Kanpur(PG)-Panki(UP) 2 Line 400 kV PGCIL 6/4/2017 16:30 6/4/2017 18:13 Bus B dead at Panki end

Aligarh - Panki Line 400 kV UPPTCL 6/4/2017 16:30 6/4/2017 17:53 Bus B dead at Panki end

Kanpur(PG)-Panki(UP) 2 Line 400 kV PGCIL 27/05/2017 3:12 27/05/2017 5:02 LA and CT blast of ICT -2 at Panki.

Allahabad Rewa Road(400kV) - PankiLine 400 kV UPPTCL 27/05/2017 3:12 27/05/2017 5:08 LA and CT blast of ICT -2 at Panki.

Kanpur(PG)-Panki(UP) 1 Line 400 kV PGCIL 27/05/2017 3:12 27/05/2017 5:57 LA and CT blast of ICT -2 at Panki.

Panki 240 MVA ICT 1 ICT 400/220 kV UPPTCL 27/05/2017 3:13 27/05/2017 6:01 R phase LA and CT blast of ICT-II at Panki

Panki 240 MVA ICT 2 ICT 400/220 kV UPPTCL 27/05/2017 3:13 21/07/2017 17:12R phase LA and CT blast of ICT-II at Panki / charged on

no load.

Panki 240 MVA ICT 2 ICT 400/220 kV UPPTCL 2/11/2017 7:01 2/11/2017 21:45

Panki 240 MVA ICT 1 ICT 400/220 kV UPPTCL 2/11/2017 7:01 2/11/2017 21:42

Panki 400 kV Bus 1 BUS 400 kV UPPTCL 2/11/2017 7:01 2/11/2017 21:01

Panki 400 kV Bus 2 BUS 400 kV UPPTCL 2/11/2017 7:01 2/11/2017 21:01

Kanpur(PG)-Panki(UP) 1 Line 400 kV PGCIL 2/11/2017 7:01 2/11/2017 21:29

Allahabad Rewa Road(400kV) - PankiLine 400 kV UPPTCL 2/11/2017 7:01 2/11/2017 20:52

Aligarh - Panki Line 400 kV UPPTCL 2/11/2017 7:01 2/11/2017 21:48

Kanpur(PG)-Panki(UP) 2 Line 400 kV PGCIL 2/11/2017 7:01 2/11/2017 21:32

Panki-Unnao Line 400 kV UPPTCL 2/11/2017 7:01 2/11/2017 21:01

As reported there was fault in B ph Unnao line B ph

conductor snapped and fallen down on the bus and

caused tripping of Bus and all 400 kV lines from Panki

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NRPC suggested to make an internal committee consisting of one member each from POWERGRID, UPPTCL, NRPC and NRLDC to audit 400/220kV Panki (UP) substation to identify the exact reason and status of remedial action taken by the constituents. 25. Multiple element tripping at 765/400kV Unnao substation: At 17:50hrs of 30th Nov 2017, there was a fault in 63MVAr 400kV Bus reactor at 400kV Unnao (UP). Reactor CB didn’t open within 200ms, it resulted into LBB (Local Breaker Backup) protection operation for 400kV Bus-1 of Unnao station. All the elements connected to 400kV Bus-1 of Unnao (UP) station tripped. At the same time bus bar protection for 400kV Bus-2 also operated due to bus tied operation in 400kV Unnao-Bareilly ckt-1. In PMU plot 2-3kV voltage dip observed in all three phase. The PMU plot is as below:

Complete station outage was frequently occurred due to bus tied operation in DMT scheme. Following were already discussed and approved in PSC (Protection Sub Committee) meeting:

During operation of isolator from one bus to other bus in DMT scheme and bus tied operation on relay panel would be checked physically.

Bus Tied operation status shall be visible to all substation operator. Sensitize all operation staff for bus tied operation alarm.

Bus Tied alarm to be attended on priority. Fault in 63MVAr bus reactor resulted into tripping of following elements:

400kV Unnao-Lucknow (PG) ckt-1 &2 400kV Unnao-Agra(UP) 400kV Unnao-Panki 400kV Unnao-Bareilly ckt-1 &2 400kV Unnao- Lucknow (UP)

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1000MVA, 765/400kV ICT-1, 2, 3 at Unnao (UP) 315MVA, 400/220kV ICT-1 &2 at Unnao (UP) 63MVAr Bus-Reactor at Unnao (UP)

NRLDC representative informed that this incident was also near miss event and also occurred in the evening peak hours, loading of 400kV lines from Anpara-Rihand complex reached up to 900MW per circuit and further tripping of only one circuit may have lead to cascading effect and wide spread disturbance. NRLDC suggested SLDC for immediate backing down of generation in Anpara-Rihand complex and generation backing down done in real time. This issue needs to be immediately addressed and remedial measures to be taken as soon as possible. NRLDC also requested SLDC to put these important tripping in the knowledge of their management for further quick action. UPPTCL representative from Unnao was absent and details are still pending. Action Points:

UPPTCL shall submit the detailed report considering the following points: o Reason of delayed opening of 63MVAR CB (transfer bus coupler) at Unnao

(UP). o In case of operation of bus bar protection for 63MVAr bus reactor (charged

through transfer bus), transfer bus coupler should have tripped instead of 400kV Bus-1 at Unnao (UP).

o Operation of both bus bar protection. o Preventive measures taken by UPPTCL on earlier decision of PSC.

UPPTCL shall also submit action taken report within 15days. All the NR constituents may kindly submit the action taken report on PSC

recommendation on bus tied operation in DMT scheme. NRPC suggested PASG meeting for both the tripping of 400/220kV Panki (UP) and Unnao (UP) substation to identify the exact reason and status of remedial action taken by the constituents. 26. Multiple element tripping at 400/220kV Dadri substation: 400 kV bus-2 of Dadri Thermal (NTPC) was under shutdown from 9:00hrs for attending hotspots. At 17:18 hrs of 9th Dec 2017, 400 kV Dadri-Harsh Vihar ckt-1 was charged from Harsh Vihar and Dadri end but 400kV Dadri Bus-2 was not synchronized from 400kV Bus-1 of Dadri (NTPC), tie breaker of 400kV Dadri-Harsh Vihar ckt-1 was not charged.

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All the 400kV elements charged through 400kV Bus-1 at Dadri Thermal. At 17:29hrs, Jack bus jumper of Unit-6, Y-phase snapped and fell on bus-I B-phase resulting in tripping of 400 kV bus-1. All running units (Unit-3, 4, 5 and 6) of Dadri Thermal tripped. Name of the tripped elements are as below:

400kV Dadri(TH)-Harsh Vihar(DTL) -1&2 400kV Dadri(TH)-Panipat(BBMB) 2 400kV Dadri(TH)-Maharanibagh(PG) 400kV Dadri HVDC 400kV AC BUS A&B Dadri 500 MVA ICT 1,2,3, 4 &5 Dadri Thermal Unit -3, 4, 5 & 6 500kV HVDC Rihand-Dadri

The PMU plots are as below:

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PMU plot of phase voltages of Bawana and Dadri

PMU plot of frequency and rate of change of frequency of different stations

PMU plot of frequency and rate of change of frequency of Dadri PMU

The Dadri Bus frequency also went down up to 43 Hz for 1 sec and indicates the islanding of Dadri AC Bus of HVDC side, this low frequency operation can be observed from above frequency plots. Dadri frequency isolated from Vindhyachal frequency and later rose to normal before tripping During the incident HVDC Rihand-Dadri bipole carrying power order of 500MW also tripped. It resulted into SPS operation for HVDC Rihand-Dadri and shed load in group C &

35

D. Till now, details received only from Samaypur BBMB and load shedding reported ~86MW on 220kV Samaypur-Palwal D/C. NRLDC stated that Dadri is very critical station for the Northern Region and such occurrence at NTPC station is very serious. NTPC was advised to apprise about the event, remedial measures taken and share the detailed report along with all the DR/EL. Punjab, Haryana, Rajasthan and UP were also advised to submit the report of SPS operation details. Lower load relief is concern needs to be looked into. NTPC representative informed that Dadri (NTPC) station has one and half breaker scheme and D type scheme and therefore, hot spot of jack bus of main bus could not identified during thermo scanning of the jack bus. Before few days of incident, bus bar protection operated at 400kV Bus-1 at Dadri (NTPC) station and during this single bus operation of 400kV Bus-2 at 400kV Dadri (NTPC), the hotspot could be observed at jack bus of 400kV Bus-2 of Dadri (NTPC). Therefore, this shutdown was taken for 400kV Bus-2. He further informed that as a remedial action, jack buses at Dadri (NTPC) which are of twin moose conductor, are being planned with quad moose conductors. NRLDC suggested NTPC to take bus shutdown of Dadri (NTPC) during low generation or unit shutdown at Dadri plant. NRLDC representative also informed that after 12 second of the incident one filter bank of HVDC Agra-BNC also tripped however no power order change was observed in SCADA. The tripping of filter was captured in SCADA as well as in Agra PMU voltage with small decrease in voltage.PMU plot of Agra bus voltage is as below

No abnormality was observed at HVDC Champa-Kurukshetra (end). NRLDC representative informed that 220 KV side bus voltage became zero after 2 minutes of tripping of 400 KV Buses of Dadri (NTPC), this tripping needs analysis. The 220 kV Bus

36

voltages observed wide variations in the plot before tripping. SCADA data plots are as below:

NRLDC representative also informed that, GT of unit-6 show small fluctuations in MVAR values and rise in MW values, the dropper of same unit GT has been reported snapped. SCADA data is as below: NRLDC also raised following points for HVDC Rihand-Dadri SPS operation:

Non tripping of 220kV Modipuram Lower relief on 220kV Samaypur-Palwal ckt-1 & 2 (61%) Non tripping at Gobindgarh and Laltokalan station of Punjab Lower load relief from Rajasthan (73% of desired load relief) Lower overall load relief (desired load relief of 520MW)

NTPC representative further informed the following point about multiple element tripping of Dadri:

400kV Dadri-Harsh Vihar ckt-1 tripped on over voltage protection from Dadri end and DT send to Harsh Vihar end. It resulted into zero bus voltage for 400kV Bus-2 of Dadri (NTPC).

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400kV Dadri-Maharani Bagh ckt also tripped from Dadri end on over voltage protection. It further resulted into tripping of 400kV Dadri-Harsh Vihar ckt-2 as this line charged through tie breaker with 400kV Dadri-Maharani Bagh ckt.

If 400kV Dadri-Harsh Vihar ckt-1 had not tripped on over voltage than 400kV Bus-2 of Dadri (NTPC) may have survived. Reason of such high voltage is yet to be ascertained.

Fault clearance time was ~100ms as other PMU was showing recovery of voltage. At Dadri, PMU is installed at AC side of HVDC Rihand-Dadri so voltage phenomena may be due to AC side filter bank discharging of HVDC Rihand-Dadri.

In last, unit-4 of Dadri (Thermal) survived on house load but finally tripped on low vacuum.

After tripping of all thermal units, Dadri Gas generation was islanded with traction load of Railway. Railway load was ~25-30MW, generation was more. It finally resulted into tripping of Gas units on over frequency protection therefore 220kV bus voltage persisted for 2minutes. Only one Gas unit survived on house load at Dadri-Gas.

As Railway supply was alternatively available from Auraiya side, supply was not affected. Railway supply from Dadri Gas was also extended within half an hour.

NRLDC representative suggested NTPC to discuss with Railway to provide the balance load with the use of Scott connection or any other arrangement so that Dadri gas unit could island with railway load or even provide power to railways after black starting. Action Points:

All the NR constituents shall follow the better maintenance practices and more frequent thermo scanning in the switch yard.

All the NR constituents shall vigilant during bus shutdown of important station and it needs to be discussed in detail during planning of shutdown.

DTL shall submit the detailed report along with DR/EL for tripping of 400kV Dadri-Harsh Vihar ckt-1 & 2.

POWERGRID shall check the reason of tripping of filter bank-5 at HVDC Agra (end) –for Agra-BNC and submit reports.

POWERGRID shall also submit the detailed report of filter bank switching along with event log at HVDC Dadri end of HVDC Rihand-Dadri.

POWERGRID shall check and correct the non-tripping of 220kV Modipuram, Gobindgarh and Laltokalan station.

Haryana and Rajasthan shall improve the MW load shedding on the dedicated feeders in SPS operation.

NTPC shall check the reason of MVAr fluctuations of unit-6 of Dadri Thermal and shall include observations in this regard in the detailed report.

NTPC shall discuss with Railways to provide the balance load so that immediate revival of supply could be possible.

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27. Multiple element tripping events in Northern region in the month of Nov-2017: A total of 17 grid events occurred in the month of Nov-2017. Out of these, 5 no. of events were of GD-1 category. The preliminary report of all the events have been issued from NRLDC. A list of all these events along with the status of details received is attached at Annexure-VIII of the Agenda.

It could be seen that a fault clearance of the order of 15000ms {04th Nov 2017: Multiple element tripping at 400kV Karcham HEP} has been observed which is very much exceeding the standard value of 100ms. The summary of the attached table is as below:

Preliminary Report or DR/EL received within 24hrs: 7 events DR/EL received after 24hrs: 3 events Fault clearance time (based on PMU data) more than CEA grid standard: 4 events Line tripping without any fault (based on PMU data): 9 events

Further, despite persistent discussions/follow-up in various OCC/PCC meetings, the compliance of the regulations is still much below to the desired level. Consolidated status plots are as below:

2, 20%

1, 10%

1, 10%

1, 10%

1, 10%

2, 20%

1, 10%

1, 10%

Over Voltage

Non operation of Bus Bar Protection

Protection Co-ordination

Wrong Bus bar protection

Wrong Switching operation

Fog related earth fault

Mal operation of Protection

Multiple line trippings on an earthfault

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In the OCC meeting all the members were requested to take expeditious actions to avoid such tripping in future. Moreover, utilities were requested to impress upon all concerned for providing the Preliminary Report, DR/EL & Detailed Report of the events in line with the regulations. NRLDC representative stated that as the issue is being reported regularly to the CERC all concerned may look into the issue seriously. All the concerned utilities were emphasized to ensure that the Preliminary Report, DR/EL & Detailed Report of the events are provided by the concerned, in time.

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Representative of NRPC stated that incident which occurred due to human error was really unfortunate. He requested all NR utilities to have proper training for maintenance team to avoid such kind of tripping’s in future. Protection setting also needs to be reviewed by all the involved agency. 28. Details of tripping of Inter-Regional lines from Northern Region for NOV’17:

A total of 19 inter-regional lines tripping within a month occurred in the month of NOV’17.The list is attached at Annexure-IX of the Agenda. The status of receipt of preliminary reports, DR/EL within 24hrs of the event and fault clearing time as per PMU data has also been mentioned in the table. The non-receipt of DR/EL & preliminary report within 24hrs of the event is in violation of various regulations. As per regulations, all the utilities shall furnish the DR/EL, flag details & preliminary report to RLDC/RPC within 24hrs of the event. They shall also furnish the detailed investigation report within 7 days of the event if fault clearance time is higher than mandated by CEA (Grid Standard) Regulations.

It could be observed from attached table that not all information regarding the tripping is received from the utilities. The summary of the attached table is as below:

Preliminary Report or DR/EL received within 24hrs: 6 events DR/EL received after 24hrs: 4 events Line tripping without any fault (based on PMU data): 6 events

Consolidated details plot is as below:

In the OCC meeting all the members were requested to note and advise the concerned for taking corrective action to avoid such tripping as well as timely submission of the information. Power Grid was requested to look into the issue specifically as most of the lines related to Power Grid NR-3.

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29. Frequency response characteristic:

One FRC based event has occurred since last OCC meeting. Description of the events is as given below: Table:

S. No.

Event Date

Time Event Description

Starting Frequency

End Frequency Δf

(in hrs) (in Hz) (in Hz)

1 12-Nov-

17 07:13hrs

All lines from Talwandi Sabo tripped, Due to Loss of Evacuation path at Talwandi Sabo generation loss of 1100 MW occurred.

50.04 49.94 -0.10

The Hon’ble CERC approved procedure has already been shared with all concerned during previous OCC meetings. FRC observed for each state control area for the events is tabulated below:

State Name

FRC for 12-Nov-17

Talwandi Sabo event

Remarks

FRC calculation for Apr-2017 onwards

Average Median

PUNJAB 174% Talwandi Sabo SCADA data

became suspect 24% 20%

HARYANA 92% Decrease in Schedule 19% 14%

RAJASTHAN 6% 19% 8% 5% DELHI -232% Increase in Schedule 26% 13%

UTTAR PRADESH -13% -31% 29% 15% UTTARAKHAND 16% 7% 14% 16% CHANDIGARH -122% Small Control area 11% 1%

HIMACHAL PRADESH

10% -7% 0% 1%

JAMMU & KASHMIR

179% 19% 14% 0%

NR 36% 11% 14% 14% In the above table, Average and Median value of FRC calculation of total 16 events (FY 2017-18) is calculated. FRC calculation of all ISGS station for the events since last OCC meeting along with median and average value of total 15events is tabulated below:

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State Name FRC for 12-Nov-17

Talwandi Sabo event

FRC calculation for Apr-2017 onward

Average Median

Singrauli 0% -4% 0%

Rihand-1 39% 26% 22%

Rihand-2 -8% 3% 6%

Rihand-3 20% -2% -1%

Dadri-1 73% 50% 51%

Dadri -2 24% 27% 27%

Dadri-Gas 0% -7% 0%

Unchahar 0% 0% 0%

Anta No generation 0% 0%

Auraiya No generation 0% 0% NAPS 22% 7% 3%

RAPS-B 14% 6% 6% RAPS-C 19% 5% 4% Jhajjar 42% 34% 32%

Sh. Cement 0% 6% 7% Badarpur No generation 3% 3%

Faridabad 0% -7% -3% Khedar No generation -1% 0% Panipat -5% 1% 0%

Yamuna Nagar No generation

Data Suspect Data Suspect

CLP Jhajjar -11% 1% 0%

Suratgarh 5% 5% 5%

Chabra No generation Data Suspect Data Suspect

KTPS -1% -5% -1%

Rajwest 0% 0% 0%

Anpara 1% 0% 2%

Anpara C 0% 7% 0%

ROSA 20% 9% 10%

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Tanda -6% 2% 1%

Paricha 0% -1% 0%

Obra 8% 4% 8%

Ropar 0% 26% 19%

State Name FRC for 12-Nov-17

Talwandi Sabo event

FRC calculation for Apr-2017 onwards

Average Median

Chamera-1 -20% 22% 11%

Chamera-2 0% 0% 0%

Chamera-3 1% 16% 12%

Bairasiul No generation 3% 2%

Salal 14% 2% 2%

Tanakpur -16% 3% 0%

Uri-1 SCADA data suspect 1% 1%

Uri-2 SCADA data suspect 15% 0%

Dhauliganga 12% 46% 25%

Dulhasti -28% 11% 3%

Sewa-II No generation 11% 0%

Parbati-3* 0% 6% 5%

Jhakri SCADA data suspect 20% 17%

Rampur 0% 11% 0% Tehri SCADA data suspect 17% 0%

Koteswar 29% 4% 0% Bhakra 0% 1% 0%

Dehar 5% -4% 1%

Pong -5% -3% -3%

Karcham Wangtoo* SCADA data suspect 62% 40%

Malana-2* No generation Data Suspect Data Suspect

Budhil* SCADA data suspect 14% 0%

Vishnu Prayag* SCADA data suspect 1% 0%

Koldam 9% 11% 9%

AD Hydro 0% 0% 0%

Sainj 7% 3% 3%

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In line with the decisions taken during various OCC meetings, the time and date of the FRC events were e-mailed to respective utilities. The details have been received only from Kawai, Rajasthan, NTPC, UP & NHPC. Following are the outcome of the detail:

No generation at Kawai TPS. No response from KTPS, Kalisindh, Chabra. Suratgarh TPS showed 5% response. Koldam response 9% as per both NRLDC computation and NTPC details. Schedule

change was observed. Faridabad GPS: As per NTPC data FRC ~ 27% (0%, as per NRLDC). Chamera-1: NHPC reported FRC ~62%. However, NRLDC calculated same to be (-

)20%. SCADA data of Chamera-1 HP:

NHPC to share reason for less response of Chamera-3 (1%) and Dhauliganga

(12%). All utilities were requested to submit the FRC of their control areas and reason of poor response. ISGS generators were also requested to submit the FRC response details along with reason of poor response. It was highlighted that the Governor Action response is to be closely monitored and improved upon.

In 138th, 139th OCC meeting following action points were decided: All the ISGSs stations shall calculate the unit wise FRC and present the graph of

FRC response from next OCC meeting onwards. SLDCs shall also calculate unit wise FRC and control area response and submit

it to RPC/RLDC. Reason of lower response shall be mentioned in the report submitted by all the

concerned utilities. Status of governor availability along with droop setting (in service or not) to be

submitted by all the ISGS generators and states utility by 139th OCC meeting. SCADA mapping of RGMO/FGMO signal by the respective utilities on their

own expense.

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OCC once again requested all the members to kindly take action on aforesaid points within 10days. 30. Revision of document for Reactive Power Management for Northern Region:

Reactive Power Management document for Northern region is due for revision. The last updated document link is as below:

https://nrldc.in/download/nr-reactive-power-management-2017

Document is password protected and password was already informed to all the NR constituents through letter dated 30th Dec 2016.

For revision in the document, following information needs to be updated in desired format:

List of 765kV, 400kVand 220kV transmission line List of Line reactors List of Bus Reactors List of FSC/TCSC& SVC List of tertiary reactors on 33kV side of 400/ 220/ 33 kV ICT’s. List of shunt capacitors OLTC details of ICT’s Generator transformer tap details List of Over Voltage setting of 400kV & above transmission line Generator reactive power capability curve for Generating stations Filters details of HVDC Agra-BNC & HVDC Champa-Kurukshetra and different

mode of operation.

Formats were attached as Annexure-36 of 139th OCC Agenda

Despite of continuous effort and follow up in last four OCC meeting details are still awaited from most of the constituents. Status of details received is tabulated below:

Reactive Power Document

Data Received from Data Not received from

Haryana Malana-II HP

Rosa-Reliance Malana-I J&K

NHPC UP APCPL

NPCIL Delhi JAYPEE

POWERGRID NR-1* NTPC POWERLINK

POWERGRID NR-3* Punjab PKTCL

Rajasthan Railway Shree Cement

SJVNL Haryana THDC

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Adani Uttarakhand Karcham (JSW)

BBMB Others…

Chandigarh

AD Hydro

POWERGRID NR3

Greenko Budhil

OCC requested all the constituents to provide the feedback, suggestion and updated information by 15th December 2017..

31. Revision of document for System Restoration Procedure (SRP) for Northern Region:

System restoration procedure for Northern region is due for revision. The last updated document link has already been shared with the constituents.

https://nrldc.in/download/nr-system-restoration-procedure-2017-2

Despite of continuous effort and follow up in last four OCC meeting details are still awaited from most of the constituents. Status of details received is tabulated below:

System Restoration Procedure

Data Received from Data Not received from

Haryana Delhi SJVN

NHPC Rajasthan HP

Punjab Rosa (Reliance) J&K

NPCIL Greenko Budhil Malana-I

NTPC JAYPEE

POWERGRID POWERLINK

Railway PKTCL

UP Shree Cement

Uttarakhand THDC

BBMB Karcham (JSW)

Chandigarh AD Hydro

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APCPL Malana-II

Adani Others…

Last year, OCC advised SLDC/Generating utilities to prepare restoration procedure in respect of their state/generating station. However information is still awaited from most of the constituents.

OCC requested all the constituents to provide the feedback, suggestion and updated information by 20th December 2017.

32. Mock Black start exercises for year 2017-18:

As per Indian Electricity Grid Code (IEGC) clause 5.8(b) “Mock trial runs of the procedure for different sub-systems shall be carried out by the Users/ CTU/ STU at least once every six months under intimation to the RLDC”.

The summary/schedule of mock black start exercise of ISGS hydro stations carried/to be carried out is tabulated below:

S.No. Proposed Date Revised Date Generating station Remarks

1 24-Oct-17

Koldam Carried out successfully.

2 31-Oct-17 Jan-Feb’18 Nathpa Jhakri & Rampur

Deferred. Tentatively in Jan-Feb’18.

3 3-Nov-17 15-Nov-17; To

be revised again

Dhauliganga Deferred due to load management.

4 7-Nov-17 13-Nov-17; Again to be

revised Salal

Deferred due to pending consent from SLDC-J&K.

5 10-Nov-17 3-Nov-17 Sewa-2 Carried out successfully.

6 14-Nov-17 To be revised Budhil

7 17-Nov-17 To be revised Malana-2 Deferred by Plant 8 21-Nov-17

Parbati-3

9 24-Nov-17 04-Dec-17 Chamera-3 Carried out successfully.

10 30-Nov-17 06-Dec-17; To

be revised again

Uri-I, II HEP, Lower Jhelum HEP, Pampore GT’s & Upper Sindh

Deferred due to pending consent from SLDC-J&K.

11 5-Dec-17 1-Dec-17 Chamera-2 Carried out successfully. Island collapsed during stage-1. 12 8-Dec-17 1-Dec-17 Chamera-1

13 20-Dec-17

Bairasiul

14 4-Jan-18

Koteshwar

15 9-Jan-18

AD Hydro

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16 16-Jan-18

Karcham Wangtoo

17 23-Jan-18

Tehri

On 12th Dec 2017, First time in the presence of NRLDC representative mock black start exercise occurred at Dadri-Gas. Following are the outcome:

• Mock black start of unit #3 (130MW) at Dadri GPS carried out on 12-Dec-17.

• Auxiliary supply fed through Diesel Generator (DG) set. • An automatic program having 23 steps to run the unit in island operation was

switched in. • However, the program stuck at 5th Step (SFC start) few times. The program

further stuck at 6th Step wherein DG set tripped on Differential protection. • After another try, the unit successfully gets synchronized with DG supply

through UAT. • The DG supply was then disconnected and unit ran stand alone with house load

(0.4 MW). • The island was then successfully synchronized with grid. • Other gas stations may also carry out such mock drills to strengthen the

restoration resources. Other gas stations may also carry out such mock drills to strengthen the restoration resources. In 140th OCC meeting Rajasthan informed about tentative dates of mock black start exercise for state generating units.

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SLDC’s may also carryout mock black-start of station in their respective control area & inform the tentative dates to the OCC as well as outcome of these exercises. The proposed Hydro Power Stations to undergo the exercise are as follows:

S. NO. Utility Hydro Power Station Installed Capacity(MW) 1

J&K

Baglihar 3x150 2 Baglihar stage-2 3x150 3 Lower Jhelum 3x35 4 Upper Sindh 2x11+3x35 5

HP

Sainj 2x50 6 Larji 3x42 7 Bhabha 3x40 8 Malana -I 2x43 9 Baspa 3x100 10 Punjab Anandpur Sahib 4x33.5 11 Ranjit Sagar 4x150 12

UP

Rihand 6x50

13 14 15

Obra 3x33 Vishnuprayag 4x100

Srinagar (Alaknanda) 4x82.5 16

Uttarakhand

Gamma Infra 2x76+1x73 17 Shravanti 6x75 18 Ramganga 3x66 19 Chibro 4x60 20 Khodri 4x30 21 Chilla 4x36 22 ManeriBhali-I&II 3x30+4x76 23

Delhi

IP Extn GTs 6x30+3x30 24 Pragati GPS 2x104.6+1x121.2 25 Rithala 3x36 26 Haryana Faridabad GPS 2x137.75+1x156.07

During last winter, SLDCs had been requested to carry out mock drills and share their experiences. However, the information is yet to be received. The information may please be shared by SLDCs and program for this year’s mock black start exercises shall also be shared. SLDCs shall submit the reports of black start exercise in their respective control area. SLDCs may also identify further generating stations/unit for black start exercise.

The power stations were requested to confirm and inform to all the concerned persons of control centre/ substations to facilitate the exercise. In last two OCC meeting, The SLDC were requested to provide the details of mock exercises carried out last season in their respective control areas and submit a scheduled plan to carry out these exercises in current season. Plan has been received only from Rajasthan. Other constituent may also submit the tentative plan for mock exercise. NRPC also requested all the concerned utilities to kindly adhere to the schedule and plan accordingly.

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33. Deviation Violation

The deviations from the schedule are to be minimized. Some of the violations brought out by the Regulations are given below: Violation of regulation 7 (1) of CERC (Deviation Settlement and related matters) Regulation 2014: (Limit on volume of deviation). Table-1: Period:-01.11.2017 to 30.11.2017

S. No. State

O/D: Violation in Overdrawl Average No of Blocks per

day U/D: Violation in Underdrawl

1 Himachal Pradesh O/D 29 U/D 3

2 Haryana O/D 24 U/D 6

3 Rajasthan O/D 24 U/D 6

4 Uttar Pradesh O/D 14 U/D 36

5 Punjab O/D 13 U/D 15

6 Uttarakhand O/D 6 U/D 26

7 Jammu & Kashmir O/D 5 U/D 2

8 Delhi O/D 2 U/D 2

9 Chandigarh O/D 1 U/D 1

Remarks: Violation is considered while Deviation from Schedule of a Utility is 150 MW or 12% of Schedule whichever is lower.

51

Violation of regulation 7 (10) of CERC (Deviation Settlement and related matters) Regulation 2014: (Sustained deviation from schedule in one direction). Period: 01-Nov-17 to 30- Nov -17

Chandigarh HP J&K Uttarakhand Delhi Rajasthan Haryana UP Punjab

Total No. of Violations

128 119 102 99 98 72 56 54 32

52

It was highlighted that most of the states are deviating from their schedule as a result there are large no. of violations. All constituents were requested to take remedial measures to arrest such large and almost continued deviation from the schedule.

Additional Point: AGC Implementation NLDC and NRLDC representative gave presentation on the experience of the implementation of AGC pilot project. Same is attached as Annex-III. Latest CERC order on AGC pilot project dated 6th Dec 2017 and its proposed implementation was discussed. NLDC/NRLDC mentioned that it has submitted a format to NRPC for accounting and settlement of AGC. NRPC acknowledged the same. Milestones of the AGC project were discussed in detail. Payment for energy and incentive for AGC were discussed. Deviation Settlement Mechanism post AGC was discussed in line with the CERC order. Report of the AGC Mock Test conducted on 29th June 2017 connecting NLDC and NTPC Dadri stg-II was discussed. Question was raised by one of the members regarding RGMO and link with AGC. It was clarified by NLDC/NRLDC that both RGMO signal and AGC signal act on the turbine governor. AGC signals reach from NLDC to NTPC Dadri boiler and turbine control loops and then to the governor thereby making the process sustainable and steady. RGMO signals are frequency based and directly act on the governor and use the stored steam in the steam chest. A detailed implementation plan to operationalize the spinning reserves in the country was also submitted to CERC on 14th July 2017 highlighting the issues involved. Secondary Control was recommended to be added as an Ancillary Service.Outline implementation of full-fledged AGC was also mentioned. NLDC SCADA upgradation started from October 2017 and is scheduled to be completed by January 2019. AGC integration work involving software modelling, hardware and communication work also has to be done in parallel. NLDC AGC set up is envisaged to be capable of sending and receiving AGC signals to all the Regional Entity generating stations to start with, for the first time in India.

ANNEXURE 4

JANAUARY 2018

State

Anticipated Peak

Demand

Expected Peak

Availability

Surplus (+)/ Deficit (-)

Anticipated Energy

Requirement

Expected Energy

Availability

Surplus (+)/ Deficit (-)

(MW) (MW) (MW) % (MU/day) (MU/day) (MU/day) % Chandigarh 260 245 -15 -5.8 3.81 3.62 -0.19 -4.99 Delhi 4250 4572 322 7.6 63.00 104.87 41.87 66.45 Haryana 6628 7292 664 10.0 118.41 122.87 4.46 3.77 H.P. 1550 1623 73 4.7 27.30 28.64 1.34 4.91 J&K 2770 2393 -377 -13.6 53.65 44.66 -8.99 -16.76 Punjab 6370 8125 1755 27.6 101.24 114.23 12.99 12.83 Rajasthan 10920 12137 1217 11.1 207.06 218.33 11.27 5.44 U.P. 16500 15200 -1300 -7.9 315.00 330.00 15.00 4.76 Uttarakhand 2210 2156 -54 -2.4 39.83 39.61 -0.22 -0.55 Region 47800 53000 5200 10.9 921.24 1041.91 120.67 13.10

Follow up issues from previous OCCMs - Status update Annex-11

SNO Description of Agenda point

Details Status updated

1 Monitoring of schemes funded from PSDF (Agenda by NPC)

The latest status of the schemes for which grant has been sanctioned from PSDF for the schemes in Northern Region. The updated available status was enclosed as Annexure 13/1 with the agenda of the 142nd OCC meeting

Update received from UPPTCL, PSTCL,RRVPNL&DTL

2 Sub-stations likely to be commissioned in next 6 months.

The details of the substations of Power Grid and their required downstream network as updated in the last OCC/ RPC meeting was enclosed at Annexure-13/2 with the agenda of the 142nd OCC meeting. All the concerned states were requested to submit the details of the downstream network associated SPECIFICALLY with THESE POWERGRID substations along with the action plan of their proposed/approved networks. All other concerned utilities to update

HVPNL & PSTCL to take note as the information submitted was not as required.

3 Cleaning and Replacement of porcelain insulators

The Minutes of the Meeting of insulator cleaning held on 14.11.17 stands issued vide letter of even no dated 29.11.2017

All other utilities requested to submit the data as required in the minutes issued. Also BBMB & HVPNL were requested to submit the balance required data as per minutes of meeting issued vide letter dated 29.11.17

POWER GRID and ADANI had submitted data

HVPNL representative intimated that cleaning work is being done and no replacement planned. BBMB representative intimated that cleaning schedule stands submitted and regarding replacement they stated as under:

The replacement of porcelain insulators, identified under stage I & II, replaced with the polymer/anti fog insulators except insulators of Rohtak Road – Narela double circuits. This remaining work of about 7% on 220kV Rohtak Road – Narela double circuits shall be completed during reconductoring by DTL as agreed in various meetings of NRPC and CEA.

UPPTCL representative submitted the information but the same was not as required & detailed in the minutes of the Meeting of insulator cleaning held on 14.11.17 that stands issued vide letter of even no dated 29.11.2017

4. Healthiness of defence

mechanism: Self- certification

Report of Mock exercise for healthiness of UFRs carried out by utilities themselves on quarterly basis is to be submitted to NRPC Secretariat and NRLDC. All utilities were advised to certify specifically, in the report that “All the UFRs are checked and found functional”. All utilities

Information ending September 2017 stand received from all utilities

requested that the reports of quarter ending 12/2017 be submitted in January by all in one go.

5. UFR REPLACEMENT 1. BBMB had informed that replacement of static relays by numerical relays at 7 sub-stations (5 stations in Haryana at Panipat, Dhulkot, Kurukshetra, Jagadhari & Hissar) by HVPNL was pending 2. In PTCUL the static type UFRs were still installed on Transformers/feeders emanating from 132KV Majra and Jwalapur Substations and 220KV Ramnagar, Roorkee and Rishikesh Substations

1.HVPNL representative assured that the relays already stands handed over to BBMB and the work is targeted to be completed by 31.12.2017

2. PTCUL representative intimated that the order for numeric relays procurement has been placed and he assured that efforts would be made to get the relays replaced by 31.12.2017

HVPNL update status is enclosed at Annexure 11/5 PTCUL status awaited.

6. Strengthening of Intra-State transmission system Action Plan of the STUs awaited from HVPNL

All SLDCs requested to give half yearly feedback ending 12/2017 in the month of 1/2018 to STU regarding bottlenecks, constraints and overloading in the State transmission network for proper transmission planning

HVPNL to update .

7. Installation of adequate static and dynamic reactive power compensators

The 125 MVAR reactor at

Hinduan & Merta were expected to

be commissioned by31.12.2017 &

30.11.2017 respectively

RRVPNL updated the status as under: Hinduan : January /2018 Merta : December /17

8 SPS for Interruption of import by NR at 765 kV Agra (from WR).

140th OCC meeting: POWERGRID informed that the technical bid wass under evaluation and the LOA would be placed by November 2017.

37th TCC/40th NRPC meeting: POWERGRID informed that the delay in the tendering process was because of the implementation of GST and the Letter of Award (LoA) would now be placed by November 2017 with the completion schedule of February 2018.

14Ist OCC meeting: POWERGRID assured that they plan to adhere to the target date of February 2018

Same status as last OCC meeting

9 Mapping of Feeders in SCADA

In the 141st OCC meeting members were informed about the “Compendium of SPS in NR” (Annexure-_9 of the MOM_) which was released in the 40th NRPC meeting. All the utilities were requested to go through the compendium and identify feeders concerning their state and map the same in SCADA.

Status awaited

10 Mock Testing of SPS for 765 kV Agra-Gwalior line

141st OCC meeting: Representative of NRLDC informed that the above logic shall be implemented for the time. However, he requested POWERGRID to search for avenues for getting the signal from circuit breaker from both the ends for verifying the status of availability of the lines. He informed that, in the presently implemented scheme a signal is being sent to Gwalior S/S from Agra S/S for providing further signal for backing down generation in WR. He requested POWERGRID to look if some modifications can be made in the communication equipments at Gwalior for getting the status of CB at Agra end. POWERGRID informed that they would look into the matter. POWER GRID to update progress

Status awaited

11. SPS for ICTs at 765 kV Unnao sub-station

141st OCC meeting: UPRVUNL representative intimated in the meeting that the work at Unnao end stands completed. Further he intimated that the offer to incorporate the logic of SPS at Anpara D has been received and the order shall be placed by them very shortly. He assured that the work is expected to be completed by 15.2.17.He also stated that the cost of the logic of SPS at Anpara D

UPRVUNL updated as under: Offer to incorporate the logic of SPS at Anpara “D” has been received and the order shall be placed very shortly. The work is expected to be completed by 15.02.2018. The cost of the logic of SPS at Anpara “D” is to be indemnified by UPPTCL.

is to be indemnified by UPPTCL. 12 SPS for Kawai –

Kalisindh - Chhabra generation complex:

141st OCC meeting: The representative of RVPNL informed that the tendering process was in progress and all out efforts are being made to implement the scheme as per target date of 28.2.18

RRVPNL representative intimated that the work is expeditiously in progress targeted to be completed timely.

13 SPS for Lalitpur Generating station:

141st OCC meeting: UPPTCL representative intimated that the scheme has been commissioned at LPGCL end. If any 765 kV Lalitpur-Agra line trips, SPS would operate for their complex. He further stated that the signal at FATEHBAD end has not been received. The issue was being looked into so that work can be completed by 31.12.2017

UPPTCL representative intimated that the work is expeditiously in progress targeted to be completed timely.

14 Planning, procurement and deployment of Emergency Restoration System

The latest status as updated by the members in 141st OCC is as under: DTL :- Order had been placed for 02 nos. of ERS. Delivery has

been completed. Training imparted in September 2017.

PSTCL: - Order has been placed. Supply expected by End November, 2017.

UPPTCL: - 02 nos. of ERS have been received. RRVPNL: - Will not be procuring HVPNL: - Earlier it was informed that in place of ERS, spare

towers would be procured worth Rs Two crore. In 138th OCC it was informed that the management is reviewing the issue of procurement of ERS.In 141st OCC meeting, HVPNL representative present intimated that it has been decided by HVPNL to procure I SET of ERS.MS NRPC lauded the decision of HVPNL and it was requested that documents/ details in regard of the procurement of ERS be submitted.

PTCUL- NIT placed. Supply expected in 3 month. Representative present intimated that the status has not been updated by STU of PTCUL still.

HPSEBL – Discussions being held with vendor. Suitability of ERS for critical locations is being explored. Representative present intimated that the updated status from STU will be intimated within a week.

BBMB - Partner states have agreed to provide the ERS as and when required by BBMB. MS, NRPC observed that Rajasthan a partner state of BBMB has not yet reviewed the decision of procuring ERS. The

PSTCL representative intimated that ERS has been received at Mumbai port and the same is under despatch to destinations given by PSTCL. HVPNL representative intimated that the Technical specification is yet to be finalized

same needs to be taken by BBMB with Rajasthan J&K- Order has been placed for 2 nos. ERS.

15 RGMO/FGMO

compliance by generators in the region

(Agenda based on letter by CERC)

The updated status was enclosed at Annexure 13/3 of the Agenda OCC 142nd meeting. All concerned utilities may update the information as desired in the last TCC & NRPC meeting.

Also the work of mapping of RGMO/FGMO status, in SCADA should be expedited so that it would be completed within 3 months as desired in the last TCC & NRPC meeting.

All concerned utilities to update.

Status awaited

16 LVRT issues of wind/solar generation

As per the CERC order dated 05.01.2016 issued in Petition No. 420/MP/2014 wherein CERC has directed that LVRT should be implemented for all wind turbines (except Stall Types) commissioned before 15.04.2014 having installed capacity equal to or more than 500 KW. Further as per the CEA Technical Standard for connectivity to the Grid (Amend.) Reg.2013 (sub clause (3) of Clause B 2 ) of the station connected to the grid 06 months after publication of these regulations (i.e.15.04.2014) shall have the LVRT capability as depicted in the sub-clause. As LVRT are not installed on many of the wind turbines in State of Rajasthan, the issue is being regularly raised in the various meetings of NRPC without any result. In the 138th OCC meeting: RVPNL representative informed as under: The updated status of LVRT for wind generators stands

submitted. Further as per directions of NRPC in 134th

OCC

meeting regarding installation of LVRT on wind generators,

the SE (REMC) has been requested repeatedly to take up the

issue with wind generators for ensuring compliance of CEA

Regulations and CERC orders in this regard. As per the

advice of the Sub-Committee in 137th

OCC meeting, the case

has been forwarded to REMC wing to submit a petition to

RERC for non-compliance of regulation.

In the 37th TCC/40th NRPC meeting representative of RVPNL stated that the proposed petition has been submitted to the management for its consent and it would be submitted to the RERC by next month. RVPNL updated that the status remains same as already intimated in the 37th TCC/40th NRPC meeting.

\\NAMITA\Users\Public\New folder (2)\annexure 11-5.docx

Annexure-11/5

Subject: Replacement of static UFR & DF/DT relays with numerical relays under TS Zone, HVPNL, Panchkula.

Sr. No. Name of sub-station Status

TS CIRCLE, HVPNL, PANCHKULA

1. 220 KV S/Stn. BBMB Khera Commissioned on 21.11.2017.

2. 220 KV S/Stn. Tepla Commissioned on 05.12.2017.

3. 220 KV S/Stn. BBMB Dhulkote Commissioned on 06.12.2017.

4. 220 KV S/Stn. Shahabad Commissioned on 07.12.2017.

TS CIRCLE, HVPNL, ROHTAK

1. 400 KV S/Stn. BBMB Panipat Commissioned on 13.12.2017.

TS CIRCLE, HVPNL, KARNAL 1. 220 KV S/Stn. Kaithal

Relays drawn and matter taken up with firm for commissioning. Relays are likely to be commissioned within 15 days.

2. 220 KV S/Stn. Cheeka

3. 220 KV S/Stn. Pehowa

4. 220 KV S/Stn. BBMB Kurukshetra

Annexure-I

Line Reactor

End-1

MVAr

Rating at

End-1

Switchable

(with

additional

CB)

Provision to

use as Bus

Reactor

(position of

line isolator)

Confirmation

by Utility for

usage as Bus

reactor

End-2

MVAr

Rating at

End-2

Switchable

(with

additional

CB)

Provision to

use as Bus

Reactor

(position of

line isolator)

Confirmation

by Utility for

usage as Bus

reactor

1. 765kV Transmission line

A. NR-1

1 Bhiwani-Meerut 1 Bhiwani(PG) 3*80 YES YES --- Meerut --- --- --- ---

NGR bypassing yet to be

done & Line yet to be

charged

2 Bhiwani-Phagi 1 Bhiwani(PG) 3*80 --- YES Phagi 3*80 YES YES YES

3 Bhiwani-Phagi 2 Bhiwani(PG) 3*80 --- YES Phagi 3*80 YES YES YES

4 Merrut-Moga 1 Merrut 3*80 YES YES --- Moga 3*80 YES YES ---

5 Phagi-Gwalior 1 Phagi 3*80 --- YES --- Gwalior 3*80 YES YES ---

6 Phagi-Gwalior 2 Phagi 3*80 --- YES --- Gwalior 3*80 YES YES ---

B. NR-2

1 Moga-Bhiwani 1 Moga 3*80 YES YES --- Bhiwani --- --- --- ---

C. NR-3

1 Agra-Fatehpur 1 Agra 3*80 --- YES YES Fatehpur 3*110 YES YES ---Jumper connection at the

time of line shutdown

2 Balia-Gaya 1 Balia 3*80 YES YES --- Gaya - --- --- ---Jumper connection at the

time of line shutdown

3 Balia-Lucknow 1 Balia 3*80 YES YES --- Lucknow 3*80 YES YES YESJumper connection at the

time of line shutdown

4 Fatehpur-Sasaram 1 Fatehpur 3*110 --- YES --- Sasaram - --- --- ---Jumper connection at the

time of line shutdown

5 Kanpur GIS - Jhatikara 1 Kanpur GIS 3*110 YES YES --- Jhatikara 3*110 --- YES ---

6 Lucknow-Bareilly 1 Lucknow 3*80 YES YES --- Bareilly 3*80 --- --- ---

7 Varanasi-Balia 1 Varanasi 3*80 --- YES --- Balia - --- ---

8 Varanasi-Gaya 1 Varanasi 3*80 --- YES --- Gaya 3*80 --- --- --- New Line

Line ownership of

POWERGRID

List of Line Reactor can be used as Bus Rector: To be confirmed by Constituents

Sl

NoLines

Ckt

ID

Reactor installed at

Remarks

Annexure-I

End-1

MVAr

Rating at

End-1

Switchable

(with

additional

CB)

Provision to

use as Bus

Reactor

(position of

line isolator)

Confirmation

by Utility for

usage as Bus

reactor

End-2

MVAr

Rating at

End-2

Switchable

(with

additional

CB)

Provision to

use as Bus

Reactor

(position of

line isolator)

Confirmation

by Utility for

usage as Bus

reactor

Sl

NoLines

Ckt

ID

Reactor installed at

Remarks

9 Varanasi-Gaya 2 Varanasi 3*80 --- YES --- Gaya - --- --- ---

765kV Fatehpur-Sasaram-

Gaya LILOed at Varanasi

and 330MVAR Mid point

reactor at Sasaram shifted

to Bus Reactor at Varanasi

10 Varanasi-Kanpur GIS 1 Varanasi 3*80 YES YES --- Kanpur GIS 3*110 --- YES ---

11 Varanasi-Kanpur GIS 2 Varanasi 3*80 YES YES --- Kanpur GIS 3*110 --- YES ---

D. UPPTCL

1 AnparaC-Unnao 1 Anpara-C 3*110 YES YES --- Unnao 3*110 YES YES ---

2 Anpara D-Unnao 1 Anpara 3*110 --- YES Unnao

3 G.Noida-Mainpuri 1 G. Noida 3*80 --- YES --- Mainpuri

G. Noida end line reactor

is being used as bus

reactor at G. Noida

4 Fatehabad-Lalitpur 1 Fatehabad 3*80 --- YES Lalitpur 3*110 --- YES

5 Fatehabad-Lalitpur 2 Fatehabad 3*80 --- YES Lalitpur 3*110 --- YES Line yet to be charged

E. Rajasthan

1 Anta-Phagi 1 Anta 3*80 YES YES --- Phagi 3*80 YES YES ---

2 Anta-Phagi 2 Anta 3*80 YES YES --- Phagi 3*80 YES YES ---

2. 765kV Transmission line charged at 400kV

A. NR-2

1 Kishenpur-Moga 1 Kishenpur 63 --- YES --- Moga 63 --- YES ---

3. 400kV Transmission line

A. NR-1

1 Dadri-Kaithal 1 Dadri Kaithal 50 --- YES

Annexure-I

End-1

MVAr

Rating at

End-1

Switchable

(with

additional

CB)

Provision to

use as Bus

Reactor

(position of

line isolator)

Confirmation

by Utility for

usage as Bus

reactor

End-2

MVAr

Rating at

End-2

Switchable

(with

additional

CB)

Provision to

use as Bus

Reactor

(position of

line isolator)

Confirmation

by Utility for

usage as Bus

reactor

Sl

NoLines

Ckt

ID

Reactor installed at

Remarks

B. NR-2

1 Dadri-Malerkotla 1 Dadri --- --- --- --- Malerkotla 63 --- YES ---

2 Fatehabad-Moga 1 Fatehabad 63 --- YES --- Moga --- --- --- ---

NGR bypass isolator

supply expected to be

completed by Jan'17.

3 Hissar-Moga 2 Hissar --- --- --- --- Moga 63 --- YES ---

4 Jalandhar-Chamba (GIS) 1 Jalandhar 50 YES YES --- Chamba GIS --- --- --- ---

5 Jalandhar-Chamba (GIS) 2 Jalandhar 50 YES YES --- Chamba GIS --- --- --- ---

6 Nakodar-Kurukshetra 1 Nakodar 50 --- YES --- Kurukshetra --- --- --- ---

7 Nathpa Jhakri-Panchkula 1 Nathpa Jhakri --- --- --- --- Panchkula 50 YES YES ---

NGR bypass isolator

supply expected to be

completed by Feb'17.

8 New Wanpoh-Wagoora 1 New Wanpoh --- --- --- --- Wagoora 50 --- YES ---

9 New Wanpoh-Wagoora 2 New Wanpoh --- --- --- --- Wagoora 50 --- YES ---

C. NR-3

1 Varanasi- Biharshariff 1 Varanasi 50 --- YES --- Biharshariff --- --- --- ---Biharshariff end is in

Eastern Region

2 Varanasi- Biharshariff 2 Varanasi 50 --- YES --- Biharshariff --- --- --- ---Biharshariff end is in

Eastern Region

D. BBMB

1 Panchkula(PG)-Panipat 1 Panchkula(PG) --- --- --- --- Panipat 71.66 YES Damaged

E. Rajasthan

1 Bikaner-Bhadla 1 Bikaner Bhadla 50 --- YES

2 Bikaner-Bhadla 2 Bikaner Bhadla 50 --- YES

Annexure-2

Synchronous mode of operation at Tehri and Koteshwar

Automatic Generation Control (AGC) Pilot Project

15th Dec 2017

Commission’s orders • Central Electricity Regulatory Commission (Ancillary Services

Operations) Regulations, 2015 – 13th August 2015 – http://cercind.gov.in/2015/regulation/Noti13.pdf – Implemented from: 12th April 2016

• Report of the Committee on Spinning Reserves – 17th September 2015 – http://www.cercind.gov.in/2015/orders/Annexure-

%20SpinningReseves.pdf

• Roadmap to operationalise Reserves in the country – 13th October 2015 – http://cercind.gov.in/2015/orders/SO_11.pdf

• CERC order on AGC pilot project – http://cercind.gov.in/2017/orders/79_rc.pdf

2

Milestones of the project…1 • POSOCO organized a two day brainstorming session on 19th

and 20th Jan 2016 – Presided by Professor Anjan Bose, Regents Professor, Washington

State University – On the topic of Spinning Reserves – Attended by all the important stakeholders.

• 16th meeting of Forum Of Load Despatchers (FOLD) held on 2nd March 2016.

• Based on all consultations – NTPC Dadri stg-II (2x490 MW) was selected as the first pilot project for

Automatic Generation Control (AGC) • A mock test was successfully conducted on 29th June 2017

– NTPC Dadri stg-II connected with NLDC through AGC, and the test yielded desired results.

– Results of the mock test are available from page 92 of the given link https://posoco.in/download/detailed-modus-operandi-on-operationalization-of-spinning-reserves/?wpdmdl=13461

• Team from Hon’ble CERC visited the AGC setup at Dadri between 17th-18th Nov 2017 and witnessed AGC functioning.

Milestones of the project…2 • Petition no. 79/RC/2017 was filed in the matter of AGC pilot project by POSOCO

with CERC. CERC in its order dated 6th December 2017 approved the Commissioning of the AGC Pilot Project between NLDC and NTPC Dadri Stage-II.

• The Commission observed that development of secondary reserves in the country will lead to grid security and reliability. The Commission also directed that similar pilot projects may be replicated by NLDC, in at least one other regional grid of the country.

• A detailed implementation plan to operationalize the spinning reserves in the

country was also submitted to CERC on 14th July 2017 highlighting the issues involved. Secondary Control was recommended to be added as an Ancillary Service. – https://posoco.in/download/detailed-modus-operandi-on-operationalization-

of-spinning-reserves/?wpdmdl=13461 • NLDC SCADA upgradation started from October 2017 and is scheduled to be

complete by January 2019. AGC integration work involving software modelling, hardware and communication work also has to be done in parallel. NLDC AGC set up is envisaged to be capable of sending and receiving AGC signals to all the Regional Entity generating stations to start with, for the first time in India.

EASTERN REGION

5

Region considered as an Area for secondary control

Ia = Actual net interchange, negative for NR meaning import by NR

Is= Scheduled net interchange, negative for NR meaning import by NR

Bf = Frequency Bias Coefficient in MW/0.1 Hz, positive value

Fa = Actual System Frequency ACE positive means NR is surplus and NR

internal generation has to back down ACE negative means NR is deficit and NR

internal generation has to increase

SOUTHERN REGION

WESTERNREGION

Eastern REGION

NORTHERN REGION

NORTH-EASTERN REGION

ACE = (Ia - Is) + 10 * Bf * (Fa - 50)

• Tie line bias mode and Frequency bias only mode both possible • Interchange scaled using a factor of 30, changeable

Architecture of the Project

New

~ INR 40 lakhs control centre portion ~ INR 50 lakhs plant portion including OFC 6 km

Existing New

Back-up NLDC

SCADA NR-IR Schedule

NR-IR Actual Frequency

AGC System at NLDC

AGC RTU at NTPC

ICCP

AGC On/OFF AGC Set point

Scaled ACE

IEC 104 Protocol

AGC Local/Remote Unit Load Set Point Actual Generation

Circuit Breaker Status

AGC Set point

NTPC DCS

DeltaP AGC Local/Remote Unit Load Set Point Actual Generation

Circuit Breaker Status

AGC console at NTPC

Factor

Data Flow in AGC Project

8

Max Load Set point

Min Load Set point

Unit Capability

Boiler Control Turbine Control

B1, B2

A1

A2

Unit DCS Inputs from the two unit DCS: ULSP of the generator for the present time block and breaker status

AGC set point from NLDC AGC using ACE, ULSP, tuned parameters, limits etc.

AGC RTU at Plant with algorithm to produce final unit wise set points

PC with provision to enter AGC unit biasing manually, if needed

PAGC Setpoint total (main)

PAGC Setpoint (Back up)

P Schedule (Back up)

P Schedule (main)

NLDC

NTPC

Unit 2 Unit 1

NTPC side Block diagram

AGC Pilot Project at NTPC Dadri Stg-II

Report of the Mock Test conducted on 29th June 2017

Pioneering Experience

List of Acronyms used and meaning • ULSP : Unit Load Set Point of NTPC Dadri Stg-II (Gross Set Point

including auxiliary power consumption) • NR Scaled ACE: ACE of the Northern Region scaled by a value of ~30

(user entry), because entire Northern Region ACE will be too high for Dadri alone.

• Delta P : AGC correction wrt ULSP Schedule (eg. Delta P is 20 MW means Regulation Up signal of 20 MW is given above the ULSP schedule by AGC)

• Dadri Stg-II Plant: has 2 units (unit -5 &6, 2x490 MW) • AGC Remote: NTPC DCS accepts AGC signal sent by NLDC • AGC Local: NTPC DCS does not accept AGC signal sent by NLDC

NTPC DCS snapshot

Unit 6 taken into AGC Remote at 1741 hrs

Actual generation following the ULSP schedule before AGC correction AGC in local mode

Unit 5 taken into AGC Remote at 1814 hrs Total Plant under AGC

Dadri Stg-II total Plant actual generation following the AGC Set point

Mock Test finished at 1910 hrs

AGC ON/OFF tested for 4 minutes from 1847 to 1851 hrs

Variation of AGC correction (Delta P) wrt NR Scaled Area Control Error AGC Correction Restricted to +/- 50 MW (Maximum Spinning Reserve utilization from NTPC Dadri Stg-II)

ACE +ve = NR Surplus ACE –ve = NR Deficit

AGC Correction +ve = Reg Up AGC Correction -ve = Reg Down

Unit 6 taken into AGC Remote at 1741 hrs

AGC in local mode Unit 5 taken into AGC Remote at 1814 hrs Total Plant under AGC

Mock Test finished at 1910 hrs

AGC ON/OFF tested for 4 minutes from 1847 to 1851 hrs

Payment for Energy & Incentive (As per CERC order)

• Variable cost of Dadri Stg-II available • Block wise data

– For both Up and Down regulation • Payment for energy

– For AGC MWh generated during a block • Payment @ variable charges plus markup 50ps to Dadri from

the NR DSM pool – For AGC MWh reduced during a time block

• Dadri pays @ variable charges to the NR DSM pool • Incentive of 50ps earned by Dadri during down regulation

• Energy account on 15 minute basis • Incentive account for every 5 minutes

DSM after AGC (As per CERC order)

• Deviation in MWh for every time block • MWh deviation = (Actual MWh) - (Scheduled MWh) - (AGC MWh) • AGC MWh can be positive or negative

– Block wise data available • Actual MWh and Scheduled MWh will be always positive • Would be settled as per the existing DSM Regulations

List of Participants in the 142nd Sub-Committee meeting held on 15.12.2017 at NRPC Sectt.! New Delhi

BBMB

I

f NHPC

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List for Operation Issues Adani PL. (i) Sh. Nirmal Sharma, VP (O&M), Fax- 0141-2292065 (ii) Sh. Sameer Ganju, Head-Northern Region, Fax No. 011-24115560 APCPL (i) AGM (O&M)-I, IGSTPP, Fax No. 01251-266326 (ii) AGM (EEMG), 01251-266326 BBMB (i) Director (PR) Fax- 0172-2652820 (ii) Power Controller, Fax- 0172-2653297. HVPNL Chief Engineer (Comm.); SE (SO & SLDC): 0181-2664440 Fax-0172-2560622 NHPC (i) Sh. Janardan Choudhary, E.D., Faridabad – Fax-0129-2272413 (ii) Sh.V.K.Sinha,Chief Engineer (O&M), Faridabad – Fax-0129-2272413 POWERGRID (i) Sh. Prabhakar singh, ED (NR-I), Fax No. 011-26853488 (ii) Sh. A.K. Arora, General Manager (O&M), NR-I, (iii) Sh. R.V.S Kushwaha, General Manager (O&M), Jammu; Fax- 0191-2471187 (iv) Sh.Rajeev Sudan Dy, General Manager (OS), Fax- 0191-2471187 RRVUNL Sh. P.S Arya, Chief Engineer (PPMC & IT), ) Fax- 0141-2740006 NTPC (i) Head of OS/ Head of RCC, Fax No. 0120-2410082 (ii) Sh. Praveen Chaturvedi, GM (OS), NRHQ Lucknow; Fax-0522-2305849. HPSEBL (i) Sh Suneel Grover, Chief Engineer (SO &P), Fax No. 0177-2653656 (ii) Sh. Deepak Uppal, SE (PR& ALDC): Fax-0177-2837143 (iii) Sh. Joginder Singh. Power Controller, Fax No. 0177-2837143. NRLDC General Manager - 26854861, 4051, 26569504 Fax- 26852747 NLDC General Manager, NLDC, Fax: 011-26853488/26601079 Lanco APTL Sh. Raj Kumar Roy, Director, Fax: 0124-2341627/4741024 SJVNL/NJHPS General Manager (C&SO), Fax- 0177-2673283 PTCUL/UPCL (i) Sh. Anupam Sharma, SE (SLDC), Fax- 0135-2451160, 0135-2763570 UPPTCL (i) Director (Op), Fax- 0522-2286476 (ii) Chief Engineer (SLDC), Fax- 0522-2287880, 2288736 HPLDS (i) Sh. N.P.sharma, SE, SLDC, Fax: 0177-2837649 (ii) Sh. Lokesh Thakur, Executive engineer, Fax: 0177-2837649 DTL General Manager (SLDC)/ General Manager (Protection) Fax-23236462, 23221069 THDCIL Sh. GM(EM - Design), Tehri, Fax- 0135-2438682 PSTCL (i) Sh. S.S.Mal, Chief Engineer (SLDC) Fax – 0175-2365340 (ii) Sh D.P.Sethi, Dy.Chief Engineer (SLDC) Fax – 0175-2365340 CHANDIGARH Sh. M.P.Singh, SE (Elect. Op.Circle) – Fax-0172-2740505 IPGCL/PPCL (i) Sh. Y.P.Arora,GM (T), IPGCL, New Delhi, Fax- 23370884 (ii) Sh. R.K.Yadav, DGM (T), IPGCL, New Delhi, Fax- 23370884 BRPL Sh. Satinder Sondhi, VP & Head System Operations, Fax No. 011-39996549 Everest PPL Sh. Yogendra Kumar, Chief Operating Officer, Fax No. 011-45823862/ 43852507 RPSCL Sh. Niranjan Jena, Addl.VP/ Sh. Suvendu Dey, Asst. VP-O&M, Fax: 05842-300003 HPGCL Sh. S.K. Wadhwa SE/Technical(HQ), Fax: 0172-5022436 CEA Sh.Vikram Singh, Director; Fax-26170385,26108834

From organizations which are yet to submit revised nominations

Uttar Haryana Bijli Vitaran Nigam Ltd. Jodhpur Vidyut Vitran Nigam Ltd. Dakshinanchal Vidyut Vitaran Nigam Ltd.

HPPTCL Director (Planning & Contracts), Fax: 0177-2626284 J&K (PDD) Chief Engineer (Survey & Commercial) Fax-0191-2476213 J&K SPDCL GM, Fax: 0194-2500145 PSPCL Engineer-in- Chief (PPRR), Fax- 0175-2308698. RRVPNL Chief Engineer (LD); SE (SO&LD) – Fax- 0141-2740920 UPRVUNL DGM (TOM), 0522-2287861 UJVNL General Manager Engineering: 0135-2761485, fax- 0135-2761549 NPCIL (i) Station Director, NAPS; Fax. 05734-222177.(ii) Sr. Manager (Transmission),

NPCILFax.-022-25563350 JPPVL Sh. Suresh Chandra, Director, Fax- 0120-4516201/4609464/4609496 Jhajjar PL Sh. Goutam Biswas, GM (Production), 01251-270155.

New Members for the year 2016-17 (Nominations not received)