Additional agenda for 130th OCC meeting 23. … agenda for 130th OCC meeting 23. Observance of High Voltage in ... Synchronous Condenser ... Hydro generator those are not providing

Additional agenda for 130th OCC meeting

23. Observance of High Voltage in the Grid:

As part of winter preparedness, for controlling high voltages in the grid, following were decided

in OCC meetings as well as during special meeting:

a. Switching off the capacitors: Though all states have confirmed during the meeting that all

capacitor banks have been switched off but proper monitoring of the same is yet to be

put in place.

b. Availability and utilization of all bus reactors and line reactors.

c. Availability and utilization of all the tertiary reactors.

d. Utilization of line reactors as bus reactors after opening of line for voltage regulation.

List of Bus reactor, line reactor, Tertiary reactor and Line reactor that can be used as Bus

reactor is enclosed in Annex‐I. It has been observed that Out of 36 tertiary reactor in NR,

only 7 nos has been reported operational. Line reactor in NR as per latest information is

253 nos, out of which only 124 nos of line reactor reportedly can be used as bus reactor.

Two line reactors are damaged, 3 bus reactors are damaged and 5 nos of bus reactor are

under long outage.

e. Transformer tap optimization

List of tap changed is enclosed in Annex‐II.

f. Synchronous Condenser operation

Chamera (NHPC) has suggested trial operation in last week of Dec’16. Testing confirmation from

RSD, Larji is still awaited. Confirmation from Uttarakhand regarding capability of new gas station is

yet to come.

g. Monitoring of all 400/220 kV ICTs and taking actions wherein Var flows are observed

from 220 kV to 400 kV side. In this respect reactive energy accounts could also be

monitored.

As per NRPC reactive energy account for week of 21st Nov 2016, net payable are Punjab,

Delhi and Jammu & Kashmir. MVAr injection at particular nodes on HV is given below:

State control area MVAr Injection at 400kV on High voltage as per NRPC REA for week of 21st Nov 2016

Punjab Ganguwal, Gobindgarh,Jamsher,Mohali, Ropar, Amritsar, Moga‐PG, Patiala & Sarna

Haryana Rohtak Road, Bahadurgarh, Fatehbad, Gurgaon,Kaithal

Rajasthan Hissar, Khetri, Bhinmal,Chittorgarh, Heerapura, jaipur South, kankroli & Sikar

Delhi BTPS, Narela,Bamnoli, Bawana, Maharanibagh, Mundka

Uttar Pradesh Anpara, Atrauli, Mainpuri

Uttarakhand ‐

Himachal Pradesh ‐

Jammu & Kashmir ‐

Chandigarh ‐

h. Opening of transmission lines keeping reliability in focus

i. Absorption of reactive power by generating units.

All the SLDCs were advised to monitor the generating stations in respective control areas for such

absorption and were also advised to correct the MVAr telemetry if any issue is being observed.

Observations regarding some of the generators at NRLDC (Plots of MVAr (X‐axis) Vs Voltage (Y‐

axis) for 15‐Dec 2016 to 09‐Dec‐2016) are as given below:

Scatter plots of ISGS stations are also given below. In last OCC meeting, NTPC assured to look into

the generating station MVAr absorption capability and provide feedback accordingly.

Members may like to discuss area/location/station wise along with action plan for further

optimization.

24. Response of SVC at Ludhiana:

+600/‐400 MVAr SVC at Ludhiana has been commissioned on 29th November 2016. Apart from

above the bus reactor at Jallandhar which was out since 7th Oct 2016, has been re‐commissioned

on 28th Nov 2016. This has resulted in substantial improvement in voltage profile around

Ludhiana. The SVC performance is given below:

Scatter plot for 25th Nov 2016 to 9th Dec 2016

is shown here. Though telemetry of Vref is

available at NRLDC, the telemetry of mode of

operation, Slope as well as dead band would

also be further useful. An operational write‐up

would also be helpful in better utilization of

this resource.

25. Hydro generation during peak and off‐peak hours

In winter, load duration curve of NR have a wide gap between peak and off‐peak demand. The

ramp, ramp rate of peaking demand required to be commensurate with appropriate ramp of

hydro generation to avoid the mismatch between load and generation and subsequently to

maintain the frequency of the grid within the prescribed band. Therefore, Hydro generation

optimization become very useful and thus its generation should be dispatched prudently as per

the system requirement.

Date

MVAr

kV

MVAr

kV

It has been observed that peak and offpeak load of NR has a difference of ~ 15‐16 GW while peak

hydro generation (regional entities) remains in range of ~ 8‐9 GW and off‐peak hydro generation

is ~ 1 GW. Hydro generator those are not providing full capacity as per hydro availability during

peak hours are Karcham, Salal, Dehar, Uri‐I & II, AD Hydro etc and some of the generator that are

generating other than peak hours are AD Hydro, Bhakra, Pong, Uri‐I&II, Salal, Tanakpur,

Koteshwar etc. During winter months it is desirable that hydro generators especially with

pondage/reservoir based shall restrict the generation during off peak hours so as to utilize same

during the peaking hours.

Some of plots are given below:

In case of state hydro, Jammu & Kashmir Hydro is being dispatched during off‐peak hours in the

range of ~ 300 MW, Rajasthan (RPS & JS) & Uttar Pradesh hydro (excluding vishnuprayag HEP) are

also being dispatching ~ 150‐180 MW each during off‐peak hours.

Hydro optimization, its timing, ramp, ramp rate etc has been discussed numbers of times in OCC

meeting and other fora and it is once again requested to all the users to ensure the hydro

generation optimization as per load requirement especially during winters.

Members may deliberate for further optimization of hydro generation

26. Performance of generating station during Ancillary Up and down

HVDC Rihand‐Dadri Pole‐2 is under shutdown since 11‐Dec‐2016 due to oil leakage in converter

transformer. Ancillary (RRAS) down was kick up for Rihand, Singrauli and Ancillary up for Dadri

thermal stations within this duration. Schedule vs. actual generation of these stations for 11th Dec

2016 is shown below. It has been observed that Rihand, Dadri‐Th was deviating from schedule

during ancillary kick up.

27. Reliability Issues

ATC/TTC of Northern region state control area is enclosed in Annex‐III.

Other reliability issues

a. Generation Dispatch in view of security constrained dispatch

Recent tripping of complete Anpara generation in Uttar Pradesh control area, Rajpura &

Talwandi saboo in Punjab state control area in Nov‐Dec’16 causes sudden loss of generation

in respective state control area subsequent to frequency change of grid.

It has been mentioned nos of times that every state control area should have a widespread

generation i.e. all the generating station that is cheap or costly should be keep on bar so

that in case of complete outage of any generating complex, other generating station’s

machine that already on bar can be increase fast to match up the loss of generation due to

Singrauli actual SCADA data is

bit less than actual generation

tripping. It would help in fast load generation balance in state control area and to maintain

the grid discipline.

b. Jammu & Kashmir reliability issues

Kashmir valley load during winter remains in range of ~1100‐1200 MW. Load in the Kashmir

valley area has been increasing over the years but intra‐state transmission system growth

has been slow. Present connectivity of Kashmir valley to rest of the grid is only through two

400 kV lines viz 400 kV Kishenpur‐Wanpoh‐Wagoora D/C and two 220 kV lines viz 220 kV

Kishenpur‐Ramban‐Mirbazar‐Pampore D/C. During such high demand and low voltage

scenario, any N‐1 contingency of the above 400kV or 220kV lines further depletes the

interconnection and poses reliability threat to the Kashmir Valley system. The inclement

weather during winter months (e.g. Storm/Snow fall) also increases the probability of multi

element tripping and thus severe reduction of the reliability.

Despite commissioning of 400/220 kV New Wanpoh substation for past few years now, the connectivity of 220 kV system at this station is yet to be planned/Commissioned. This is resulting in N‐1 non‐compliance of 220 kV Wagoora‐Ziankote D/C and Wagoora‐Pampore D/C lines apart from very low voltages in the valley area.

28. Tripping of lines on High Voltage

Since November’16, average ~ 30 nos of 400kV and above line is being opened for voltage

regulation and average 10 nos of 400kv and above lines trip during fog , details is as given below:

Date Tripping during Fog

Multiple element tripping Tripping on

High Voltage Line opened on High

Voltage Events

Lines tripped

11/30/2016 31 5 15 2 29

12/1/2016 12 0 0 0 34

12/2/2016 10 1 2 0 34

12/3/2016 10 1 2 0 31

12/4/2016 4 1 2 0 28

12/5/2016 8 1 2 1 33

12/6/2016 2 0 0 0 31

12/7/2016 4 0 0 1 40

12/8/2016 15 3 9 2 22

12/9/2016 4 0 0 1 32

12/10/2016 10 1 2 1 36

12/11/2016 7 0 0 2 22

12/12/2016 6 0 0 3 33

Total 123 13 34 13 ‐

Average 10 1 31

Further, 41 nos of EHV has been given planned shutdown by NRLDC since 30th Nov 2016 for

Insulator replacement/ Cleaning of Insulators/ Pre‐winter Maintenance.

States has also been reported nos of 220kV line tripping during fog. States control area may also

share the preventive action being taken to avoid such tripping.

29. Deviation Report

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)

Period:‐01.11.2016 to 27.11.2016

S.No. State O/D: Violation in Over drawl Average No of

Blocks per day U/D: Violation in Underdrawl

1 Punjab O/D 35

U/D 8

2 Rajasthan O/D 32

U/D 7

3 Uttar Pradesh O/D 31

U/D 28

4 Uttarakhand O/D 17

U/D 12

5 Jammu & Kashmir O/D 14

U/D 1

6 Haryana O/D 13

U/D 19

7 Himachal Pradesh O/D 12

U/D 3

8 Delhi O/D 9

U/D 2

9 Chandigarh O/D 1

U/D 0

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

Schedule whichever is lower.

Violation of regulation 7 (10) of CERC (Deviation Settlement and related matters) Regulation

2014: (Sustained deviation from schedule in one direction).

Period: 01‐Nov‐16 to 27‐Nov‐16

Chandigarh Delhi Haryana HP J&K Punjab Rajasthan UP Uttarakhand

Total No. of Violations

126 123 111 107 102 93 59 47 37

Members may like to discuss and take action to avoid such violations. It could be seen that these

zero crossing violations are very high in numbers indicating less sensitization of the operators at

control centers.

In the absence of AGC controls, it is very important that Area Control Error (ACE) of respective

control areas is monitored and corrected expeditiously.

30. Low Frequency Oscillation occurrence during opening of 400kV Tehri‐Koteshwar ckt‐1:

In antecedent condition, FSC of Meerut‐ Koteshwar (Pool) ckt ‐2 at Meerut (PG) was under damage condition from 16.07.2015 and FSC of Meerut‐ Koteshwar (Pool) ckt ‐1 at Meerut (PG) was under outage from 04.11.2016. Shutdown (Planned) code issued for 400kV Meerut‐Koteshwar (Pool) ckt‐1 for isolator replacement at Koteshwar (Pool) GIS. During shutdown of the ckt‐1, only one uncompensated evacuation line was available from Koteshwar (Pool) to Meerut. Antecedent generation in the complex was ~1150MW (1060MW at Tehri and 90MW at Koteshwar). On 22nd Nov 2016, at 08:13hrs 400kV Meerut‐Koteshwar ckt‐1 was taken under shutdown for isolator contact replacement at Koteshwar (Pool) GIS. During opening of the line, low frequency oscillations observed in the power system. PMU plot of frequency and rate of change of frequency is:

Salient point for low frequency oscillations on 22nd Nov 2016: At the moment of outage of 400kV Koteswhar(Pool)‐Meerut ckt‐1, oscillation started into the

NR system and sustained upto 47second. Oscillations started at 08:13.34hrs and die down at 08:14:21hrs. Oscillations were observed in Balia, Hissar, Bassi and Karcham voltage magnitude, frequency

& angle. Negative damping observed for 0.76Hz and 1.6Hz frequency mode. Tehri generation was manually reduced by ~300MW within 20second.

One SPS is already discussed and approved in the OCC meeting.

Approved SPS of Tehri complex‐ “When all the four machines (i.e. Tehri HPS (4 × 250 MW) and Koteshwar HPS (4×100 MW)) are running and any one of the 400 kV Koteshwar‐Merrut circuit trips, one unit of 250 MW of Tehri HPS should be tripped instantaneously”. However, in actual real time grid operation on 22nd Nov 2016, oscillations observed in the system for 1150MW generation in the complex. It may be due to dynamic behavior of power system. On 23rd Nov 2016, NRLDC control room tried to increase the generation in the complex upto 1200MW by 10‐20MW block increment. No oscillation observed in the system for 1200MW generation in the complex. SPS needs to be reviewed for considering the dynamic behavior of the system. Tripping of one unit may not be averted the oscillation i.e. Tripping of two units needs to be planned for proposed SPS operation of Tehri/Koteshwar generation complex.

Member may kindly discuss and review the planned SPS of Tehri/Koteshwar generation complex.

31. Multiple element tripping events in Northern region since last OCC meeting:

Following multiple tripping events took place in NR since last OCC meeting. The preliminary report of

all the events have been issued from NRLDC.

S.No

Outage Time Duration of fault (as per PMU)

Owner / Agency

Event (As reported)

Category as per CEA Grid

Standards

Status of Preliminary report received within 24hrs (Y/N)

Status of DR/EL received within 24hrs (Y/N)

Status of

Analysis report received (Y/N)

Date Time (in Hrs)

1 11‐11‐16 09:11 80ms POWERG

RID/UP

220kV Meerut(PG)‐

Modipuram(UP) 1 & 2 tripped

reportedly on B‐phase to earth

fault.

GI2 N N N

2 11‐11‐16 14:16 120ms DTL/PO

WERGRID

400kV Bahadurgarh(PG)‐

Bawana(DTL) tripped due to

wavetrap problem and 400kV

Bahadurgarh(PG)‐Bawana(GT)

tripped along with this.

GI2 N N N

3 11‐11‐16 20:46 No fault

observed Haryana

400/220kV Nuhiyawali 315 MVA

ICT 1 & 2 tripped on overvoltage. GI2 N N N

4 17‐11‐16 09:34 80ms THDC/PO

WERGRID

During opening of Bus‐2 isolator

of Koteshwar Pool‐Tehri Ckt‐2,

Bus Fault reported in “Y” phase of

Bus‐2 (Fault Current ~ 6kA). As

per pre‐fault condition, all lines

were connected to Bus‐2, bus

bar‐2 operation leads to tripping

of all lines.

GD1 Y Y N

5 20‐11‐16 03:03 No fault

observed

DTL/PO

WERGRID

400kV Maharanibagh‐

Ballabhgarh and 400kV

Maharanibagh‐Dadri TH tripped

on overvoltage.

GD1 N Y N

6 21‐11‐16 01:17 No fault

observed

DTL/PO

WERGRID

400kV Maharanibagh‐

Ballabhgarh tripped on

overvoltage at 01:17hrs. 220kV

Maharanibagh‐Lodhi Road ckt‐1

and 220kV Maharanibagh‐Truma

centre ckt‐2 tripped along with

this.

GD1 N Y N

7 21‐11‐16 21:17 No fault

observed

Punjab/B

BMB

On bus‐bar operation at

Rajpura(PSTCL), 400kV

Dehar(BBMB)‐Rajpura(PSTCL),

400kV Bhiwani(BBMB)‐

Rajpura(PSTCL), 400kV

Rajpura(PSTCL)‐Rajpura

TPS(PSEB) along with unit #4 at

Dehar HEP(BBMB) tripped.

GD1 N Y Y

8 25‐11‐16 16:57 80ms Punjab

LA of 400kV Kanpur(765)‐Kanpur

ckt‐1 at Kanpur(765) end blasted

resulting complete outage of

whole 765/400kV Kanpur(PG)

station. 400kV Kanpur(765)‐

Kanpur ckt‐2 was under S/D.

GI2 N N N

9 27‐11‐16 10:32 80ms Rajastha

n

400kV Heerapura‐Merta and

400kV Heerapura(RVPNL)‐

Phagi(RVPNL) ckt‐1 tripped

reportedly on phase to earth

fault.

GI2 N N N

10 28‐11‐16 10:43 80ms

POWERG

RID/Hary

ana

400/220kV Hissar 315MVA ICT #1

& 3, 220kV Hisar(PG)‐Hisar‐

IA(HVPNL) ckt‐1 & 2 and 220kV

Hisar(PG)‐Isharwal(HVPNL) 2

tripped. Busbar protection

operation is reported.

GI2 N N N

11 29‐11‐16 01:08

Two

successiv

e faults of

80ms

clearance

time

UP

400kV Bareilly‐Unnao ckt‐1

tripped on overvoltage and

Bareilly‐Unnao ckt‐2 tripped on

phase to earth fault.

GI2 N N N

12 29‐11‐16 02:10 No fault

observed

UP/Uttra

khand

400kV Alaknanda HEP(UP)‐

Srinagar(UTT) ckt‐1 & 2 tripped

reportedly on phase to earth

fault.

GI2 N N N

13 29‐11‐16 03:37 400ms UP

400kV Muradnagar‐

Muzaffarnagar and 400kV

Alaknanda HEP ‐ Muzaffarnagar

ckt‐2 tripped reportedly on phase

to earth fault.

GI2 N N N

14 30‐11‐16 00:18

Two

successiv

e faults of

80ms

clearance

time

POWERG

RID

500kV HVDC Balia‐Bhiwadi Bipole

tripped on transient fault due to

non availability of 66 KV earth

electrode line at Bhiwadi end.

GI2 N Y Y

15 30‐11‐16 00:59 560ms UP/LPGC

L

765/400kV Fatehabad 765(UP)

1500 MVA ICT 1 and 765kV

Fatehabad 765(UP)‐Lalitpur

TPS(LPGCL) 1 tripped.

GI2 N N N

16 30‐11‐16 03:14

Two

successiv

e faults of

120ms

clearance

time.

NTPC/DT

L

220kV Badarpur(NTPC)‐

Ballabgarh(BBMB) 2, 220kV

Badarpur(NTPC)‐Noida sec

20s(UP), 220kV Badarpur(NTPC)‐

Sarita vihar(DTL) 2, 220kV

BTPS(NTPC)‐MIA Alwar(RPVNL),

220kV Badarpur(NTPC)‐

Mahrauli(DTL) 2 and 220kV

Badarpur(NTPC)‐Okhla(DTL) 2

tripped.

GD1 N N N

17 30‐11‐16 03:50

Two

successiv

e faults of

120ms

clearance

time.

UP 400/220kV 240MVA Muradnagar

ICT #1 & 2 tripped. GD1 N N N

18 30‐11‐16 06:02 ‐ UP

At 06:02hrs all elements

connected from 400kV Anpara

along with unit at Anpara, Anpara

C & Anpara D tripped and

resulted complete outage of

Anpara A,B,C & D TPS.

GD1 N N N

19 30‐11‐16

06:48

&

07:24

Two

successiv

e faults of

80ms &

120ms

clearance

time

Punjab

400kV T.Sabo‐Dhuri ckt‐1 tripped

at 06:33hrs and ckt‐2 tripped at

06:24hrs. 400kV T.Sabo‐Nakodar

tripped at 06:42hrs and 400kV

T.Sabo‐Moga tripped at 06:48hrs.

T.Sabo unit #3 tripped at

06:48hrs ( gen loss ~300MW0.

400kV T.Sabo‐Muktsar ckt‐2

along with unit #1 & 2 tripped at

07:24hrs and further resulted in

gen loss of 800MW.

GD1 Y Y N

20 01‐12‐16 01:56 80ms UP

400kV Anpara‐Mau and 400kV

Anpara‐Obra tripped due to

dense fog.

GI2 N N N

21 02‐12‐16 06:00 80ms Punjab

400kV Nakodar ‐ Rajpura (TH)

ckt‐1 and 2 tripped due to dense

fog. Rajpura TH unit #2 tripped

due to outage of lines.

GD1 Y Y N

22 03‐12‐16 03:23

Two

successiv

e faults of

80ms

clearance

time

POWERG

RID

400kV Balia‐Patna ckt‐3 & 4

tripped on Y‐N fault during high

density fog.

GI2 N N N

23 04‐12‐16 06:29 No fault

observed Punjab

400kV Makhu‐Mukatsar ckt‐1 & 2

tripped reportedly on phase to

earth fault.

GI2 N N N

24 05‐12‐16 20:40 160ms UP

400kV Bareilly‐Unnao ckt‐1

tripped on overvoltage and

Bareilly‐Unnao ckt‐2 tripped due

to fog.

GI2 N N N

25 08‐12‐16 02:28 80ms Punjab 400kV Dhuri(400kV) ‐Rajpura TH

ckt‐1 & 2 tripped due to fog. GI2 N N N

26 08‐12‐16 03:08 80ms Haryana

In antecedent condition, 400kV

Rajpura‐Dehar was already

opened on High voltage.400kV

Rajpura‐Nakodar ckt‐2 tripped at

02:54hrs. 400kV Rajpura‐Nakodar

ckt‐1, 400kV Rajpura‐Bhiwani

and 400kV Rajpura‐Rajpura(Th)

tripped at 03:08hrs due to fog.

Due to loss of evacuation path,

400kV Rajpura Th unit #2

generating around 350MW

tripped.

GD1 N N N

27 08‐12‐16 03:53 80ms Delhi

In antecedent condition, 400 kV

Talwandi Sabo‐Nakodar, 400 kV

Talwandi Sabo‐Dhuri 1 & 2 were

already opened on over voltage.

400 kV Talwandi Sabo‐Moga

tripped at 01:38hrs. 400 kV

Talwandi Sabo‐Mukatsar 1&2

tripped at 03:08hrs due to fog.

Due to loss of evacuation path,

400kV Talwandi Sabo unit #1 & 2

generating around 650MW

tripped.

GD1 N N N

It could be observed that despite persistent discussions/follow‐up in various OCC/PCC meetings, the

compliance of the regulations is still much below to the desired level.

Member may please impress upon all concerned for providing the Preliminary Report, DR/EL &

Detailed Report of the events in line with the regulations and also take expeditious actions to avoid

such tripping in future

Members may like to discuss.

32. Details of tripping of Inter‐Regional lines from Northern Region for November’16:

The list of tripping of inter‐regional lines in the month of November’16 is given below. 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 above table that the not all information regarding the tripping is received

from the utilities, except in one case.

Members may please note and advise the concerned for taking corrective action as well as timely

submission of the information.

33. Frequency response characteristic:

One FRC based event has occurred since last OCC meeting. The FRC has been computed by NRLDC as

well as request was sent to state control areas along with other regional entities to compute the same

at their end. Description of the events is as given below:

FRC

S.NO Event Date Time (in hrs)

Event Description Starting

Frequency (in Hz)

End Frequency (in Hz)

Δf

1 30‐Nov‐16 06:02

At 06:02 Hrs all running units in

Anpara generation complex tripped

most likely due to tripping of 400kV

Anpara‐Sarnath D/C. Generation

loss of 2000 MW occurred. At the

same time Vindhyachal Block‐1

tripped due to DC Over current

protection.

50.25 49.99 ‐0.26

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 Control Area

FRC computed

(Based on NR‐

SCADA data)

PUNJAB 17%

HARYANA 30%

RAJASTHAN 15%

DELHI 21%

UTTAR PRADESH 30%

UTTARAKHAND 4%

CHANDIGARH 35%

HIMACHAL PRADESH 7%

JAMMU & KASHMIR 5%

Northern Region (NR) 18%

Thermal Generators

FRC computed

(based on NR‐

SCADA data)

Hydro Generators

FRC computed

(based on NR‐

SCADA data)

Rihand‐3* NA Chamera‐1* NA

Unchahar* NA Salal* NA

Anta* NA Uri‐2* NA

Auraiya* NA Sewa‐II* NA

Sh. Cement* NA Tehri* NA

Faridabad* NA Malana‐2* NA

Khedar* NA Budhil* NA

Panipat* NA Vishnu Prayag* NA

Yamuna Nagar*

NA Karcham Wangtoo*

NA

Suratgarh* NA Bairasiul 24.2%

Chabra* NA Dulhasti 20.9%

Rajwest* NA Koteshwar 20.5%

Anpara* NA Chamera‐3 18.7%

Anpara C* NA Dhauliganga 15.1%

Tanda* NA Uri‐1 9.8%

Parichha* NA Pong 5.0%

Dadri ‐2 96.0% Dehar 3.1%

Badarpur 46.4% Parbati‐3 0.0%

Dadri‐1 28.5% Bhakra ‐2.2%

Jhajjar 21.2% Tanakpur ‐4.3%

ROSA 12.0% Chamera‐2 ‐6.6%

RAPS‐C 7.4% Rampur ‐9.5%

NAPS 1.6% Jhakri ‐66.7%

KTPS ‐1.2%

Rihand‐1 ‐1.7%

Singrauli ‐4.4%

Rihand‐2 ‐4.6%

CLP Jhajjar ‐6.4%

RAPS‐B ‐8.7%

Ropar ‐11.9%

Dadri‐Gas ‐61.8%

Obra ‐106.3%

In line with the decisions taken during various OCC meetings, the time and date of the FRC events

were e‐mailed to respective utilities. However, FRCs from utilities are yet to be submitted. Utilities

may kindly submit the FRC of their control areas.

UP has sent FRC of its control area generators for the event of Lalitpur tripping on 19.10.16 &

20.10.16.

Members may discuss the reason for such poor frequency response and suggestive measures to

monitor it and improve it.

Members may discuss and decide a date wherefrom all the generators shall be put in governor

responsive mode.

34. Mock Blackstart exercise:

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”. Schedule has been given in 127th OCC meeting for conducting mock blackstart testing in the year 2016‐

2017.The summary of the Mock Black start exercises conducted so far 2016‐17 is given below:

S.No. Proposed

Date

Actual

Date

Generating

station

Report

Received Remarks

1 20‐Oct‐16 ‐ Parbati‐III HEP ‐ Deferred by the Power station for last

week of November.

2 25‐Oct‐16 ‐ Budhil HEP ‐ Deferred by the Power station.

3 28‐Oct‐16 09‐Nov‐16 Chamera‐3 HEP Yes Black start exercise was carried out

successfully.

4 2‐Nov‐16 ‐ Sewa‐2 HEP ‐

Absence of synchronizing feature in

the existing relay at Sewa‐II. This issue

has been taken up with M/s BHEL i.e.

OEM for resolving the same.

5 7‐Nov‐16 ‐ Malana‐2 HEP ‐ Exercise deferred due to Shutdown at

AD Hydro.

6 11‐Nov‐16 11‐Nov‐16 Chamera‐2 HEP No

During charging of 400kV Chamba‐

Jallandhar, line tripped from

Jallandhar end on over voltage

stage‐1 at first attempt and on

fault at 400kV Chamera‐2(end)‐‐

Chamba on second attempt. The

exercise is to be clubbed with

Mock black start activities carried out at state embedded generating units were also to be informed

regularly but till now no information is available. All SLDC may update the status and inform the

outcome of exercises.

Member may discuss.

35. Mapping of UFR & df/dt in SCADA systems of state:

The Hon’ble Central Electricity Regulatory Commission (CERC), through its order dated 23rd

December 2013 in petition no 221/MP/2012 has ordered as follows:

Chamera‐1 HEP.

7 17‐Nov‐16 ‐ Chamera‐1 HEP ‐ Black start exercise was carried out

successfully.

8 22‐Nov‐16 ‐ Bairasiul HEP ‐ Date confirmed by station.

9 25‐Nov‐16 ‐ Dhauliganga HEP ‐

Due to minor SF6 gas leakage in line

isolator compartment of 220kV

Bareilly(UP) line the exercise is to be

deferred for last week of December.

10 30‐Nov‐16 07‐Dec‐16 Koteshwar HEP ‐

During synchronization of island at

Tehri, 400kV Koteshwar Pool‐Tehri

line tripped on O/V at first attempt.

Later on it was synchronized

successfully.

11 9‐Dec‐16 ‐

Nathpa Jhakri

HEP & Rampur

HEP

‐ To be confirmed by stations.

12 16‐Dec‐16 20‐Dec‐16

Uri‐I, II HEP,

Lower Jhelum

HEP & Pampore

GT’s

‐ Date confirmed by Uri‐I, II.

13 22‐Dec‐16 ‐ AD Hydro HEP ‐

14 28‐Dec‐16 16‐Dec‐16 Karcham

Wangtoo HEP ‐ Date confirmed by Karcham

15 3‐Jan‐17 ‐ Salal HEP ‐ Date confirmed by station.

16 9‐Jan‐17 ‐ Tehri HEP ‐

17 13‐Jan‐17 ‐ Koldam HEP ‐

“(c) UFRs and df/dt relays also be mapped on the SCADA system of each state so that they can be

monitored from SLDC/NRLDC. (d) All STUs and SLDCs to map/network the UFR and df/dt on their SCADA system.”

NRLDC has taken up the issue since then and the same is also being discussed in various OCC meetings

wherein it has also been decided that both digital and analog values, of the feeders where such relays

have been installed, shall be monitored. NRLDC had also taken up for same again through its letter no.

NRLDC\TS‐11\1216 dated 08/07/2016.

In 120th OCC meeting, a uniform formats for mapping of UFR & df/dt in SCADA systems for all the

states for visualizing the feeders was suggested by NRLDC. These formats have to be compiled by

respective state/SLDC by co‐coordinating with respective SCADA team of SLDCs.

Considering that communication from all UFR and df/dt relays is yet not available, it was decided in

124th OCC meeting that wherever, such issues are arising, the transformers at 220kV or 132 kV

substations be monitored and mapped in the SCADA as alternate monitoring point.

The issue was once again discussed in 125th, 126th, 127th and 128th OCC meeting of NRPC. The status of

UFR, df/dt SCADA displays of different states/UTs as received at NRLDC is tabulated below:

State Remarks

UFR SCADA display df/dt SCADA display

Punjab Feeders are not segregated as per respective UFR, df/dt settings

Only one end analog data of the feeder; Digital status of CB not mapped

Haryana

setting of df/dt and feeder name doesn’t match

SCADA telemetry of many feeders not availableSCADA telemetry of four out of six feeders not available

Only one end analog data of the feeder Only one end analog data of the feeder

Stage‐wise total load relief not mentioned

Feeder wise planned load relief not mentioned Feeder wise planned load relief not mentioned

220kV Narwana: 100MVA ICT‐1 (UFR‐49.0Hz) & ICT‐2 (UFR‐48.6Hz) are parallel ICTs but in different stages

132kV Karnal‐Ramba ckt is mentioned in both UFR‐48.6Hz and UFR‐48.8Hz stages

Rajasthan Mapped UFR, df/dt SCADA displays not received at NRLDC

Delhi UFR, df/dt feeders mapped as per areas in Delhi viz. Dadri, BTPS, Bawana, Delhi

UP Mapped UFR, df/dt SCADA displays not received at NRLDC

Uttarakhand Mapped UFR, df/dt SCADA displays not received at NRLDC

HP

Feeders are not segregated as per respective UFR, df/dt settings

Only one end analog data of the feeder

132kV Kunihar Barotiwala‐1 (49.9Hz, 0.1Hz/sec) & Barotiwala‐2 (UFR‐48.6Hz) are parallel ckts but in different stages

132kV Giri: 132/33kV ICT‐1 (UFR‐49.0Hz) & ICT‐2 (UFR‐48.8Hz) are parallel ICTs but in different stages

J&K Mapped UFR, df/dt SCADA displays not received at NRLDC

Chandigarh Mapped UFR, df/dt SCADA displays not received at NRLDC

In all the displays, only one end analog data of feeders is mapped, stage based segregated load relief not mentioned and alternate feeder for telemetry not mapped

Member may please discuss, update the status and take action accordingly.

36. Revision of document for Reactive Power Management for Northern Region:

Reactive Power Management document and System restoration procedure for Northern region are

due for revision. The last updated document link has already been shared with the constituents are as

follows:

http://www.nrldc.org/docs/NR‐RPM‐2016.pdf

http://www.nrldc.org/docs/NR‐SRP‐2015.pdf

Utilities may kindly give their feedback, suggestion & updated information at the earliest in order to

revise the document. The current status of details received from the constituents is tabulated below:

System Restoration Procedure

Data Received from

Data Not received from

AD Hydro Malana‐II SJVN

Delhi Adani HP

APCPL Rosa (Reliance) J&K

Haryana Greenko Budhil Malana‐I

NHPC Punjab JAYPEE

Rajasthan Railway NPCIL

NTPC UP POWERLINK

Uttarakhand PKTCL

BBMB Shree Cement

Chandigarh THDC

POWERGRID Others…

Karcham (JSW)

Utilities may kindly give their feedback, suggestion & updated information at the earliest in order to

revise the documents.

Member may discuss.

37. PILOT PROJECT TO DRAW POWER FROM INSULATED EARTH WIRE OF 400KV BHIWANI JIND TRANSMISSION LINE AS A R&D PROJECT(Agenda by POWERGRID):

A pilot project to draw approximate 2‐5kW power by insulating few km of one of the two earth wire of

400kv BHIWANI JIND line and tapping the induced voltage through MV class PT, whose secondary shall

be used to feed the load, shall be executed by POWERGRID near BHIWANI substation under a R&D

project.

System Restoration Procedure

Data Received from

Data Not received from

AD Hydro Malana‐II SJVN

Greenko Budhil Adani HP

UP* Rosa (Reliance) J&K

Malana‐I Delhi APCPL

NPCIL Karcham (JSW) JAYPEE

NTPC Punjab NHPC

Railway POWERLINK

Haryana PKTCL

Uttarakhand Shree Cement

BBMB THDC

Chandigarh

Rajasthan

POWERGRID Others…

The details of basic scheme are attached for ready reference as Annex‐IV. The outcome of success of

this R&D project/ scheme, shall be shared with all constituents by POWERGRID.

This is for information to all OCC members.

38. Frequently opening of NAPS lines by UPSLDC and kept open for longer duration (Agenda by NAPS):

There are five 220 kV lines emanating from NAPS,3 out 5 lines i.e. NAPS-Khurja-1,NAPS-Harduaganj & NAPS- had been LILOed by UPPTCL at Dibai, Atrauli & Sambhal respectively. Recently, it has been observed that LILO links are opened very frequently on one and other reasons without information to NAPS as well NRLDC and kept open for week’s .Opening of these links results in weakening the grid connectivity to NAPS. Before formation of LILO in NAPS-Khurja line-1, UPPTCL Authorities ensured that the proper communication will be made with NAPS if opening of these links required. The details of opening of these links are given as below;

i) NAPS-Harduaganj line opened at Atrauli on 30/11/2016 and remained open till

10/12/2016. ii) NAPS- Moradabad line opened at Moradabad on 12/12/2016 and remained open

till 13/12/2016. iii) NAPS- Khurja line-1 also kept opened at Dibai at nos. of time recent past.

UPPTCL authorities are requested to advising their officials for effective communication and co-ordination with NAPS Control room according to available guide lines.

Annex‐I

Operational Tirtiary Reactor

Sl No. Utility Station_Name Installed on Rating (MVAR)

Out since and reason of outage

1 NTPC AURIYA CCGPP 33 KV SIDE OF 315 MVA ICT ‐ 1 25

2 NTPC AURIYA CCGPP 33 KV SIDE OF 315 MVA ICT ‐ 2 25

3 UPPC BAREILY (UP) 33 KV SIDE OF 315MVA ICT ‐ 1 32

4 UPPC BAREILY (UP) 33 KV SIDE OF 315MVA ICT ‐ 2 32

5 UPPC LUCKNOW(UP) 33 KV SIDE OF 315MVA ICT ‐ 1 25

6 UPPC SULTANPUR 33 KV SIDE OF 240MVA ICT ‐ 1 25

7 UPPC SULTANPUR 33 KV SIDE OF 240MVA ICT ‐ 2 25

Non‐Operational Tirtiary Reactor

Sl No. Utility Station_Name Installed on Rating (MVAR)

Out since and reason of outage

1 PGCL MOGA(PG) 33 KV SIDE OF 315MVA ICT 1 25 Out due to fire in ICT‐2 since 2001.

New equipment has been installed and cabelling work is

pending 2

PGCL MOGA(PG) 33 KV SIDE OF 315MVA ICT 2 25

3 UPPC AGRA(UP) 33 KV SIDE OF 500MVA ICT ‐ 1 31.5

315MVA ICT‐I replaced by 500MVA & tertiary kept open as per instruction of the firm.

4 UPPC AGRA(UP) 33 KV SIDE OF 315MVA ICT ‐ 2 31.5 LA & Capacitor unit damaged.

5 UPPC AZAMGARH 33 KV SIDE OF 315MVA ICT ‐ 1 31.5 CB alotted,CT&PT Not Alotted

6 UPPC AZAMGARH 33 KV SIDE OF 315MVA ICT ‐ 2 31.5 CB alotted,CT&PT Not Alotted

7 UPPC G. Noida 33 KV SIDE OF 315MVA ICT ‐ 1 31.5

8 UPPC G. Noida 33 KV SIDE OF 315MVA ICT ‐ 2 31.5

9 UPPC GORAKHPUR(UP) 33 KV SIDE OF 240MVA ICT ‐ 1 31.5

10 UPPC LUCKNOW(UP) 33 KV SIDE OF 315MVA ICT ‐ 2 25

02 No. Bushing Damaged. Bushings are to be arranged from M/s BHEL

11 UPPC MAU (KASARA)‐400 33 KV SIDE OF 200MVA ICT ‐ 1 31.5

12 UPPC MAU (KASARA)‐400 33 KV SIDE OF 200MVA ICT ‐ 2 31.5

13 UPPC MORADABAD 400 33 KV SIDE OF 315MVA ICT ‐ 1 25

14 UPPC MORADABAD 400 33 KV SIDE OF 315MVA ICT ‐ 2 25

15 UPPC MURADNAGAR 400 33 KV SIDE OF315MVA ICT ‐1 25

16 UPPC MURADNAGAR 400 33 KV SIDE OF315MVA ICT ‐2 25

17 UPPC MUZAFFARNAGAR 400 33 KV SIDE OF315MVA ICT ‐1 31.5

18 UPPC MUZAFFARNAGAR 400 33 KV SIDE OF315MVA ICT ‐2 31.5

19 UPPC OBRA‐B TPS 33 KV SIDE OF ICT ‐ 2 31.5 Out due to damage

20 UPPC OBRA‐B TPS 33 KV SIDE OF ICT ‐ 1 31.5 Out due to damage

21 UPPC PANKI 400 33 KV SIDE OF 240MVA ICT ‐ 1 25

33KV CT,PT, Surge Arrester etc damaged

22 UPPC PANKI 400 33 KV SIDE OF 240MVA ICT ‐ 2 25

33KV CT,PT, Surge Arrester etc damaged

23 UPPC SARNATH 33 KV SIDE OF 315MVA ICT ‐ 1 31.5



26 UPPC UNNAO 33 KV SIDE OF 315MVA ICT ‐ 1 32

02 No. Bushing Damaged. Bushing are to be arranged.

27 UPPC UNNAO 33 KV SIDE OF 315MVA ICT ‐ 2 32

Tender to erect the pipe of the bay is under Process.

28 PTCUL RISHIKESH 400 33 KV SIDE OF ICT ‐ 1 25

29 PTCUL RISHIKESH 400 33 KV SIDE OF ICT ‐ 2 25

Annexure‐ II: OCC Agenda 22 (B)

S.No. Name of Stations

Owner Present tap position

*Suggested tap Position

Date & TIME

A. 400kV Stations

1 Abdullapur POWERGRID 9B 11 18:25/24.10.20165

2 Agra UP UPPTCL ‐ Tap position number

increase by one

3 Akal

RRVPNL 9 Tap position number increase by one 10

19:34/26.10.2016

4 Allahabad POWERGRID 11 13

5 Amritsar POWERGRID 9B 11 19:15/24.10.2016

6 Azamgarh

UPPTCL ‐ Tap position number

increase by one

7 Bahadurgarh POWERGRID 7 11

8 Bareilly UP


increase by one

9 Bawana DTL ‐ 11

10 Daultabad

HVPNL 10 Tap position number increase by one 11

12:30/26.10.2016

11 Dehar BBMB

BBMB ‐ Tap position number

increase by one

12 Dhuri PSTCL 9B 11 14:25/13.10.2016

13 Fatehabad POWERGRID 9B 11 13:26/13.10.2016

14 Gurgaon POWERGRID 9B 11

15 Hamirpur POWERGRID 9B 11 12:50/11.10.2016

16 Hisar POWERGRID 9B 11

17 Jalandhar POWERGRID 9B 11 13:35/11.10.20146

18 Kabulpur

HVPNL ‐ Tap position number

increase by one 19:35/25.10.2016

19 Kaithal

POWERGRID 9B Tap position number increase by one 10

17:25/24.10.2016

20 Kishenpur POWERGRID 9 11 17:20/11.10.2016

21 Ludhiana POWERGRID 9B 11 15:45/11.10.2016

22 Makhu PSTCL 9B 11

23 Malerkotla POWERGRID 9 11 15:03/11.10.2016

24 Mandola POWERGRID 9B 11

25 Meerut

POWERGRID 9B 11 Already at 11 (no

change)

26 Moga POWERGRID 9B 11 16:25/11.10.2016

27 Moradabad


increase by one

28 Mukatsar

PSTCL 9 b Tap position number increase by two 11 16:25/13.10.2016

29 Mundka

DTL ‐ Tap position number

increase by one

30 Muzaffarnagar

UPPTCL ‐ Tap position number increase by three

31 Nakodar PSTCL 9B 11 16:36/13.10.2016

32 Nalagarh POWERGRID 9B 11 13:50/11.10.2016

33 Nuhiyanwali

HVPNL 9B Tap position number increase by one 10

18:00/25.10.2016

34 Obra B


increase by two

35 Panchkula POWERGRID 9B 11 17:28/24.10.2016

36 Panki


increase by one

37 Patiala POWERGRID 9B 11 13:10/11.10.2016

38 Sarnath


increase by one

B. 765kV Stations

39 765kV Anpara‐D UPPTCL 14 11

40 765kV Meerut POWERGRID 12 11

41 765kV Moga POWERGRID 12 11

42 765kV Unnao UPPTCL 16 12

43 765kV Bareilly POWERGRID 12 9

*Note: Generally, tap change control is at HV side except in case of Panipat in Northern region where tap change control is at 220kV side. Tap position number increase by one : If present tap position number is 9 , it is proposed to increase the tap position number to 10 ( By increasing the tap position number, Voltage at HV side decreases) Tap position number decrease by one : If present tap position number is 9 , it is proposed to decrease the tap position number to 8 ( By decreasing the tap position number, Voltage at HV side increases)

Annex‐III

ATC of state control area of Northern region

State ATC during Summer/Monsoon (MW)

Constraints/Issues Discussion in meetings

Punjab ~6500

N-1 non-compliant at Dhuri, Amritsar, Malerkotla & Patiala ICTs.

Underlying network of Amritsar and Ludhiana.

No underlying connectivity at 400kV Patran.

Following are the element to be commissioned that may relief the transmission constraints as provided by Punjab SLDC: 1. Amritsar:

Erection of 220kV DC line from Makhu to 220kV Rashiana (expected date: 31.12.2016).

Erection of 220kV DC line from Makhu to 220kV Algaon (expected date: 31.05.2017).

540MW Generation at GVK Goindwal Sahib.

2. Patiala ,Dhuri & Malerkotla

400/220KV, 500MVA, 1st ICT at 400kV Dhuri (Re commissioned: 06.08.2016).

LILO of 220kV Patiala- 220kV Mandi Gobindgarh D/C line at 400kV Rajpura (31.08.2016).

LILO of 220kV Patran- 220kV Kakrala 220kV line at 400kV PGCIL Patran (expected date: 31.10.2016)

LILO of 220kV Patran –220kV Rajla 220kV line at 400kV PGCIL Patran(expected date: 31.10.2016)

Erection of 220 kV D/C line from 400kV Rajpura to 220kV Devigarh(expected date: 31.12.2016)

Commissioning of 400/220KV, 500MVA, 3rd ICT at 400kV Dhuri (expected date: 28.02.2017)

3. Ludhiana: 220kV DC line from 400kV Nakodar to

220kV Ladhowal (expected date: 31.03.2017)

LILO of 220kV Humbran - 220kV Ferozpur Rd Ludhiana line at 220kV Ladhowal (expected date: 31.12.2017).

Haryana ~6300

N-1 non-compliant at Ballabhgarh, Kaithal, Gurgaon, Dhanoda 220kV network of Hisar PG, 400kV Mahindergarh-Bhiwani D/C, 220kV Charkhi Dadri-Lula Ahir.

Isolator rating issue at 400kV Nawada & 400kV Dhanonda (constraining evacuation of HVDC Mundra-Mohindergarh) power substations.

Tower collapse at 400kV, 220 & 132 kV level

No underlying network at 400/220kV Jind, Bhiwani, Kurukshetra

All issues have been discussed since 125th to 127th OCC meeting.

400/220kV, 315MVA ICT-2 at Ballabhgarh has been replaced by 500MVA capacity (Sept’16).

As reported by HVPNL in 127th OCC meeting Isolator at Nawada has been replaced in sept’16.

Isolators at Dhanonda are expected to replace by Dec’16.

Many 400kV (~4) and 220kV (~ 12) lines were remain under breakdown for more than a month due to tower collapse, reduces the reliability & evacuation issues in the interconnected network. Breakdown of 400kV Jhajjar-Daultabad D/C constrained evacuation of Jhajjar generation.

Rajasthan

~4500

N-1 non-compliant at Bhilwara, Bassi, Jodhpur, 400kV Phagi-Bassi.

In wind pocket, Akal ICTs are overloaded and Outage of large wind generation (LVRT issues)

N-1-1 non-compliant of 765kV Anta-Phagi D/C.

Evacuation Issue of Kawai/Kalisindh/Chhabra Complex.

SPS of Kawai/Kalisindh/ Chhabra has been implemented.

In view of large generating complex and connected to Phagi/Gwalior, it was suggested to plan for N-1-1 contingency in this complex.

765/400kV Phagi ICTs are also not N-1 non-compliant.

400kV Phagi-Bassi D/C (Quad moose) loading remains in the range of ~1800-2000 MW.

Planned network at 400kV Phagi-Heerapura and Phagi-Ajmer D/C is still to be commissioned.

During thunder storm on 23rd May 2016, tripping of both 765kV Anta-Phagi (One on fault and other were manually tripped due to isolator burnt at Anta end) lead to generation loss of whole complex. Therefore, N-1-1 planning of this complex is very important for Grid security and reliability.

Kalisindh ICT is out since 4-June-2016 and Jodhpur ICT-2 is out since 10-Aug-2016

Delhi ~4500

N-1 non-compliant of Mandola, Bamnoli, Maharani Bagh.

N-1-1 security of south Delhi area around BTPS.

Open 400kV transmission ring at two places Bamnoli & Mundka S/s. in Delhi.

High loading around 220 kV Wazirabad/Geeta Colony.

Connectivity at Mundka, Harsh Vihar, 220kV Gazipur-Noida and 220kV Badarpur-Noida is out since Sep-14 due to faulty cable.

400/220kV, 315MVA ICT-1, 3 & 4 at Mandola has been replaced by 500MVA capacity each.

400/220kV, 315MVA ICT-2 & 3 at Bamnoli has been replaced by 500MVA capacity each.

Opening of Delhi ring due to tower collapse of 400kV Jhatikara-Bamnoli D/C and one ckt is charged on ERS tower and other one is still out.

Split Bus operation at Bamnoli leading to overloading of three ICTs those are on one bus.

400kV Bawana-Mundka D/C is also under shutdown since 27th Sep 2016 (tentative schedule was 15th Oct 2016, still under s/d) due to increase in height of tower (Metro construction)

400kV Bamnoli-Jhatikara is out since 22nd May

2016

New 220 kV Loni Road-Patparganj and Wazirabad to be expedited.

Uttar Pradesh

~7200-7700 depends on

own generation of

UP

N-1 non-compliant of Agra (UP),Muradnagar, Muzaffarnagar, Unnao, Mainpuri, Allahabad, Lucknow UP, Azamgarh & Sultanpur ICTs.

Evacuation network of new generating stations Anpara D, Bara and Lalitpur.

N-1-1 security of

SPS for evacuation of Anpara-D is still pending.

Third ICTs at 765/400 kV Unnao is still awaited.

Elements should be expedited as early as possible:

400kV Gr. Noida, 400kV Gr. Noida –Gr.Noida (765kV) D/C

765kV Lalitpur-Fatehabad (Agra)-2 & LILO of one ckt of 400kV Agra (PG)-Agra (UP).

765kV Bara-Mainpuri D/C.

Greater Noida/Noida area

Radial connectivity at Muradnagar (New),

No underlying connectivity at Sohawal.

765kV Anpara D-Unnao.

765/400kV, 100MVA 3rd ICT at Unnao.

Uttarakhand

~900-950

N-1 non-compliance of 400/220kV Kashipur,

N-1 non-compliance of 220kV Roorkee(PG)- Roorkee(PTCUL),

Heavy overdrawal has been observed in Uttarakhand. Loading of Kashipur ICTs also remained n-1 non-compliant most of the time. It has been discussed and highlighted in OCC meetings also. It has been observed that Gas generation at Kashipur has slightly relief the loading of Kashipur ICTs.

Himachal

Pradesh ~1000

N-1 non-compliance of Panchkula / 220kV network of Madanpur/ 220/132kV Kunihar ICTs

Overdrawal by HP and same time selling the power in STOA has been observed. Better planning has been suggested number of times. HP was suggested to banking the other arrangements for sudden hydro outages due to silt and other issues.

Jammu &

Kashmir ~1800

N-1 non-compliance of Wagoora ICT, underlying 220kv network of Wagoora, Kishenpur.

No underlying network at Samba, New Wanpoh

Any N-1 contingency in the 400kV or 220kV network in the valley lead to complete blackout of Kashmir Valley.

Full substation outage due to any maintenance because of Single Bus and transfer schemes in all the 220kV substation of Jamm & Kashmir.

Recently Gladini/Heeranagar/ was full out due to the maintenance work at 220kV Gladini/Heeranagar, whole substation has to shutdown affecting the load and reliability of Jammu area.

Note: In winter, due to change in load generation scenario and element that are expected may change the TTC/ATC of respective control area/Interconnected network.

Annex-IV

Documents

Additional agenda for 130th OCC meeting 23. … agenda for 130th OCC meeting 23. Observance of High Voltage in ... Synchronous Condenser ... Hydro generator those are not providing