Ministry of Power Northern Regional Power...

18-ए, शहीद जीत स िंह मार्ग, कटवारिया िाय, नई सदल्ली- 110016 फोन:011-26513265 ई-मेल: [email protected] वेब ाईट: www.nrpc.gov.in

18-A, Shaheed Jeet Singh Marg, Katwaria Sarai, New Delhi-110016 Phone: 011-26513265 e- mail: [email protected] Website: www.nrpc.gov.in

भारत सरकार

Government of India

विद्युत मंत्रालय

Ministry of Power

उत्तर के्षत्रीय विद्युत सवमवत

Northern Regional Power Committee

िं: उ.के्ष.सव. ./प्रचालन/106/01/2020/7852-93 सदनािंक: 11/08/2020

विषय: प्रचालन मन्वय उप- समसत की 174वी िं बैठक का कायग ूची I

Subject: Agenda of 174th OCC meeting.

प्रचालन मन्वय उप- समसत की 174वी िं बैठक का आयोजन वीसियो कॉन्फ्रें स िंर् के

माध्यम े सदनािंक 13.08.2020 को आउटेज बैठक के पश्च्यात एविं 14.08.2020 को

सकया जाएर्ा । उक्त बैठक की कायग ूची उत्ति के्षत्रीय सवद्युत समसत की वेब ाइट

http://www.nrpc.gov.in पि उपलब्ध है।

174th meeting of the Operation Co-ordination sub-committee will be conducted

through Video Conferencing on 13.08.2020 after the outage meeting and 14.08.2020.

The agenda of this meeting has been uploaded on the NRPC web-site

http://www.nrpc.gov.in.

The link and password for joining the meeting will be mailed to respective e-mail

IDs in due course.

Kindly make it convenient to attend the meeting.

( ौसमत्र मजूमदाि)

अधीक्षण असियिंता (प्रचालन)

सेिा में : प्रचालन समन्वय उप सवमवत के सभी सदस्य।

To : All Members of OCC

mailto:[email protected]

http://www.nrpc.gov.in/

mailto:[email protected]



http://www.nrpc.gov.in.members/

http://www.shabdkosh.com/translate/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%9A%E0%A4%BE%E0%A4%B2%E0%A4%A8/%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%9A%E0%A4%BE%E0%A4%B2%E0%A4%A8-meaning-in-Hindi-English

कायग ूची: उ.के्ष.सव. . की प्रचालन मन्वय उप- समसत की 174वी िं बैठक पृष्ठ 2 of 26

खण्ड-क: उ.के्ष.वि.स. Part-A NRPC

1. Confirmation of Minutes

The minutes of the 173rd OCC meeting which was held on 14.07.2020 and

15.07.2020 through video conferencing were issued vide letter of even number

dated 04.08.2020.

No comment on minutes has been received till date.

The sub-committee may kindly confirm the Minutes.

2. Review of Grid operations of July 2020

2.1 Supply Position (Provisional) for July 2020

State / UT Req. / Avl.

Energy (MU) Peak (MW)

Anticipated Actual %

variation Anticipated Actual

% variation

CHANDIGARH (Avl) 180 189 4.9% 360 384 6.7%

(Req) 210 189 -10.1% 440 384 -12.7%

DELHI (Avl) 5106 3313 -35.1% 7232 6310 -12.7%

(Req) 3200 3314 3.6% 6600 6310 -4.4%

HARYANA (Avl) 6360 5970 -6.1% 11130 10982 -1.3%

(Req) 5540 5970 7.8% 10400 10982 5.6%

HIMACHAL PRADESH

(Avl) 932 855 -8.2% 1387 1479 6.6%

(Req) 806 855 6.1% 1336 1479 10.7%

J&K and LADAKH

(Avl) 2030 1403 -30.9% 3280 2427 -26.0%

(Req) 1680 1403 -16.5% 3010 2427 -19.4%

PUNJAB (Avl) 7700 7402 -3.9% 13400 13148 -1.9%

(Req) 7300 7402 1.4% 13010 13148 1.1%

RAJASTHAN (Avl) 8890 7791 -12.4% 16860 13079 -22.4%

(Req) 6290 7797 24.0% 11470 13079 14.0%

UTTAR PRADESH

(Avl) 11997 12875 7.3% 21500 23419 8.9%

(Req) 11625 12984 11.7% 21500 23419 8.9%

UTTARAKHAND (Avl) 1460 1229 -15.8% 2640 2030 -23.1%

(Req) 1330 1229 -7.6% 2140 2030 -5.1%

NORTHERN REGION

(Avl) 44100 40927 -7.2% 69268 67578 -2.4%

(Req) 38290 41042 7.2% 63300 68288 7.9%

As per above, negative / significant variation (≥5%) in Actual Power Supply Position

(Provisional) vis-à-vis Anticipated figures is observed for the month of July-2020 in

terms of Energy Requirement for Chandigarh, Haryana, HP, UTs of J&K and Ladakh,

Rajasthan, UP, and Uttarakhand and in terms of Peak Demand similar variation is

noted for Chandigarh, Delhi, Haryana, HP, UTs of J&K and Ladakh, Rajasthan, UP,

and Uttarakhand.

These states/UTs are requested to submit reason for such variations so that


the same can be deliberated in the meeting.

All SLDCs are requested to furnish provisional and revised power supply position in

prescribed formats on NRPC website portal by 2nd and 15th day of the month

respectively for the compliance of Central Electricity Authority (Furnishing of

Statistics, Returns and Information) Regulations, 2007.

2.2 Power Supply Position of NCR

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 July 2020 is placed on NRPC website. (http://nrpc.gov.in/operation-category/power-supply-position/). Power supply position of NCR for the current financial year is as under:

0

1000

2000

3000

4000

5000

6000

Ap

r-2

0

May

-20

Jun

-20

Jul-

20

Haryana

PeakDemand(MW)PeakMet(MW) 0

500

1000

1500

2000

2500

3000

Ap

r-2

0

May

-20

Jun

-20

Jul-

20

Haryana

EnergyRequirement(MU)

EnergyAvailability(MU)

0

500

1000

1500

Ap

r-2

0

May

-20

Jun

-20

Jul-

20

Rajasthan

PeakDemand(MW)

PeakMet(MW)

0200400600800

1000

Ap

r-2

0

May

-20

Jun

-20

Jul-

20

Rajasthan



http://nrpc.gov.in/operation-category/power-supply-position/

http://nrpc.gov.in/operation-category/power-supply-position/


3. Maintenance Programme of Generating Units and Transmission Lines

3.1. Maintenance Programme for Generating Units

The meeting on proposed maintenance programme for Generating Units for the

month of September 2020 is scheduled to be held on 13.08.2020 (Pre-Lunch

session) via video conferencing.

3.2. Outage Programme for Transmission Elements.

The meeting on proposed outage programme of Transmission lines for the month of

September 2020 is scheduled to be held on 13.08.2020 (Pre-Lunch session) via

video conferencing.

4. Planning of Grid Operation

4.1. Anticipated Power Supply Position in Northern Region for September 2020

The Anticipated Power Supply Position in Northern Region for September 2020 is as

under:

3400

3500

3600

3700

3800

3900

Ap

r-2

0

May

-20

Jun

-20

Jul-

20

Uttar Pradesh

PeakDemand(MW)

PeakMet(MW) 2400

2500

2600

2700

2800

2900

Ap

r-2

0

May

-20

Jun

-20

Jul-

20

Uttar Pradesh



0

2000

4000

6000

8000

Ap

r-2

0

May

-20

Jun

-20

Jul-

20

Delhi

PeakDemand(MW)

PeakMet(MW) 0

1000

2000

3000

4000

Ap

r-20

May

-20

Jun

-20

Jul-

20

Delhi




State / UT Availability / Requirement

Energy (MU)

Peak (MW)

CHANDIGARH

Availability 160.0 360

Requirement 150.0 360

Surplus / Shortfall 10.0 0

% Surplus / Shortfall 6.7% 0.0%

DELHI





HARYANA



Surplus / Shortfall 810.0 -100

% Surplus / Shortfall 15.7% -1.0%

HIMACHAL PRADESH





J&K and LADAKH

Availability 1690.0 3290.0

Requirement 1540.0 3040.0



PUNJAB



Surplus / Shortfall -120.0 -550

% Surplus / Shortfall -1.7% -4.5%

RAJASTHAN





UTTAR PRADESH (Revised on 07.08.2020)

Availability 12600 23000

Requirement 12450 23000

Surplus / Shortfall 150 0


UTTARAKHAND





NORTHERN REGION






SLDCs are requested to update the anticipated power supply position of their

respective state / UT for the month of September-2020 and submit the measures

proposed to be taken to bridge the gap between demand & availability, as well to

dispose of the surplus, if any, in the prescribed format.

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

The variable charges detail for different generating units are available on the MERIT

Order Portal. All states/UTs are requested to submit daily data on MERIT Order

Portal timely.

6. Submission of breakup of Energy Consumption by the states

The updated status on the submission of energy consumption breakup is presented

below:

State / UT From To

DELHI Apr-2018 Apr-2020

HARYANA Apr-2018 Mar-2020

HIMACHAL PRADESH Apr-2018 May-2020

PUNJAB Apr-2018 Apr-2020

RAJASTHAN Apr-2018 May-2020

UTTAR PRADESH Apr-2018 Mar-2020

All the remaining states/UTs viz., Uttarakhand, UTs of J&K and Ladakh and

Chandigarh are again requested to submit the requisite data w.e.f. April 2018 as per

the billed data information in the format given as under:

Category→ Consumption by Domestic

Loads

Consumption by

Commercial Loads

Consumption by

Agricultural Loads

Consumption by Industrial

Loads

Traction supply load

Miscellaneous / Others

<Month>

7. Automatic Demand Management System

The status of implementation of ADMS which is mandated in clause 5.4.2 (d) of IEGC

by SLDC/SEB/DISCOMs is presented below:

State/ Utility Status

Punjab Not fully implemented.

At SLDC level, remote tripping of 100 feeders at 66 kV is possible.

At 11 kV feeder level, ADMS is to be implemented by Distribution Company. As per the information available with SLDC, for 50 feeders of


State/ Utility Status

11 kV at Amritsar and Ludhiana, scheme was under finalization.

Further, deliberations are being held with M/s Siemens regarding use of separate Hardware/software/applications for implementing ADMS on 66 kV feeders where remote control (through SCADA) facility was available.

M/s Siemens has submitted the tentative cost for implementation of ADMS for which negotiations were being conducted.

M/s Siemens could not respond actively in the matter due to complete curfew/lockdown in the state of Punjab due to Covid-19.

Now, the advance discussions are being held with M/s Siemens for implementation of ADMS on 66 KV feeders.

Delhi Fully implemented by TPDDL, BRPL and BYPL.

NDMC implementation was scheduled to be completed by 31.03.2020 but

has been delayed due to some changes incorporated in the scheme.

Rajasthan Under implementation.

LoA placed on 12.12.2018 with an execution period of 18 months for ADMS at the level of 33 kV feeders at EHV Substation of RVPN under

SCADA / EMS part of project. Supply is in progress. Work is under execution.

Implementation is delayed due to COVID-19 and would be completed by December 2020.

ADMS functionality at 11 kV feeders from 33/11 kV substation is under the jurisdiction of the DISCOMs and matter is being perused with DISCOMs authorities

UP Not fully implemented.

Remote operation of 50 feeders at 132 kV level being operated from SLDC.

Further, deliberations were also being held with M/s Siemens.

For the down below network, issue taken up with the DISCOMs.

Haryana Not implemented.

HP 02 feeders could be operated from SLDC through manual intervention. Letter has been sent by HPSEB to HP-SLDC for making its operation automatic.

Members may update the status of implementation of scheme.

8. Follow-up of issues from previous OCC Meetings- Status update.

The updated status of agenda items is enclosed at Annexure-A.I.

All utilities are requested to update the status.


9. Certification of non-ISTS 220 kV Charor-Banala transmission line for carrying

ISTS power (agenda by HPPTCL)

HPPTCL vide e-mail dated 06.08.2020 has requested NRPC Secretariat for carrying

out study for certification of non-ISTS 220 kV Charor-Banala transmission line for

carrying ISTS power. It was informed that the said line evacuating power since

December 2019.

The committee may be made aware that the methodology as approved in 36th

NRPC meeting requires certification to be based on the average utilisation of line

considering the power flow scenario of Q2 and Q4 of preceding year (2019-20 in the

aforementioned case).

However, as the line was charged in December 2019 the data for Q2 would not be

available and the study could not be got conducted as per the already approved

methodology.

Based on the above, there are 2 possible options available:

a) The study for the said line may be conducted during next year i.e. 2021-22 by

taking the data for Q2 and Q4 of 2020-21, or

b) Study may be conducted after December 2020 by considering the data for Q4

of 2019-20 and Q2 of 2020-21, or

Study according to Option b) as given above, could only be conducted after

obtaining the approval of TCC/ NRPC.

Members may deliberate.

10. NTPC NR Stations Generating Units Overhaul Plan for FY 2020-21 (agenda by

NTPC)

NTPC NR Stations Generating Units had planned overhaul for FY 2020-21 which

were approved by NRPC on 12.03.2020, however due to spread of Covid-19

pandemic & subsequent lockdown by Govt of India, no overhaul plan as approved

by NRPC could be availed.

Efforts have been made from April-2020 onward to resume overhaul activity of

Generating Units (since it is due for long period & Unit Operational parameters are

fast detoriating). The overhaul plan of Generating Units have been put up for NRPC

Approval in real time but could not be availed due to prevailing conditions caused by

spread of COVID-19.

Many positive cases of Covid-19 have been reported from different NTPC Projects

and Stations. The movement of required contracting agencies manpower from far

nook & corner of country is still not possible due to Railways & strict government

guidelines regarding Quarantine & social distancing which has have made it

impossible to resume overhaul right at the moment.

Since no firm date of overhaul can be proposed in advance, therefore, it is proposed

that Generators may be allowed to avail overhaul in real time as & when prevailing


situations improves.


11. Agenda cum Report on failure of 400/220/33kV 150 MVA, TELK make

Transformer T-5 (Y-phase of ICT-2 bank) at BBMB Panipat (agenda by

POWERGRID)

400/220/33kV 450MVA ICT-2 consisting of 03 nos. single phase units of 150 MVA at

BBMB Panipat are owned by POWERGRID. These units are commissioned in 1985.

The spare single phase unit belongs to BBMB which is common for ICT-1 and ICT-

2. The detail of transformers at BBMB Panipat are as below:

Sr Unit identification Ownership Status

T1 ICT-1 R BBMB In service

T2 ICT-1 Y BBMB In service

T3 ICT-1 B BBMB In service

T4 ICT-2 R POWERGRID Was in service

T5 ICT-2 Y POWERGRID Failed on 12.07.2020

T6 ICT-2 B POWERGRID Failed on 30.06.2018. New

transformer procurement was under

process.

T7 Spare for ICT1 & ICT2 BBMB Was in use in place of ICT-2 B

450 MVA ICT-II bank at BBMB Panipat tripped on differential protection at 10:31 Hrs

on 12.07.2020 during heavy rain. Flashover was reported on tertiary terminal of Y-

phase unit. The detail of Y-phase unit is as below:

Transformer Particulars Details

Make TELK

Voltage rating 400/220/33kV

MVA rating 150 MVA


Sr.No. 140053-02(T-5)

Year of Manufacture 1984

Year of Commissioning May 1985

After tripping, Physical inspection of the tertiary yard was done by BBMB and

following was observed:-

a) As spare transformer (T7) can be taken into service in place of any of the

transformer of ICT-I or ICT-II bank, the tertiary bus of 02 conductors from T7

runs along all the 06 transformers of ICT-I & ICT-II. Tertiary conductors of Y-

phase of ICT-II bank (T5) cross the bus of Spare unit (T7) at 90 deg.

b) At this point of crossing flashover was occurred between T7 tertiary bus and

conductor of T5. It was raining heavily at the time of fault Insulation was

found opened at two points. Flashover marks were observed at T-connector,

intended for use when T-5 is out of service and spare unit is in use in place of

it. Fault current of 2.5kA for Y-phase is observed in DR from IV side.


c) After rectification of the insulation tapes and analysis of fault currents ICT

was charged at 1458 hrs but tripped again due to bucholz relay operation of

Y-phase (T5) transformer unit. Fault current of ~800A in Y-phase & B-phase

is observed in DR from IV side.

Testing of Y-phase (T5) was carried out and results show that tertiary winding is

shorted internally and with ground. ICT-2 bank cannot be taken into service, till

replacement.

O&M History of failed Transformer:

Transformer was commissioned in 1985 and was in successful operation till the time

of failure. DGA results prior to tripping indicated no abnormality in the Transformer.

Transformer was operated at around 250 MW and is very critical in terms of

connected industrial load is concerned.

Sample Date Load H2 CH4 C2H4 C2H6 C2H2 CO CO2

09.03.2017 170 4 17 3 18 0 157 2524

04.09.2017 255 7 19 4 20 0 175 3147

After rectification of insulation

tapes


20.04.2018 70 7 23 7 22 0.5 174 2747

11.04.2019 215 6 22 8 25 0 196 3061

04.12.2019 200 8 21 9 25 0.5 199 3140

09.06.2020 170 8 25 10 24 0 196 3188

12.07.2020(After

Failure) 0 42 32 29 24 28.1 186 3012

Oil parameters and Furan indicated normal aging of the Transformer.

Date of Sampling BDV PPM IFT Resistivity Acidity Furan

11.04.2019 63.5 6 28.3 0.930 0.050 -

04.12.2019 - 7 - - - 0.088

09.06.2020 - 7 - - - -

C & Tan Delta results of Bushings (WTI/OTI :- 35 deg Centi)

ID Measured Mode Test kV Cap(pF) Tan Delta

%

HV Bushing C1 UST 10.00 361.7 0.418

IV Bushing C1 UST 10.00 328.8 0.642

3A1 LV

Bushing

C1 UST 10.00 Voltage not build up

3A2 LV

Bushing

C1 UST 10.00 Voltage not build up

Magnetizing Current

Voltage applied at

Voltage applied

Current measured

Normal value in healthy transformer (reference)

HV-E 232.4 330.0 mA 1.5 mA

IV-E 233.8 1.14 A 3.0 mA

Tertiary 3.1 – 3.2 233.4 Fuse blown

20 mA

The transformer has already given the services for 35 years. The new transformer of


150 MVA units was under procurement. Being a specific design of 150 MVA/unit

instead of 105 MVA/unit in vogue with layout and percentage impedance constraints

there was response from only one bidder despite long persuasions. In this way, the

procurement and supply of 150 MVA units may have taken longer time and Panipat

is a critical station as far as load is concerned. In view of this POWERGRID is

installing a 3-phase 500 MVA spare unit of standard design. Foundation has to be

modified with other civil works. The work has already been started at site and the

new unit is expected to be charged by the end of Oct’20. POWERGRID is putting all

efforts forth to charge it at the earliest.

As the transformer had already served for its useful life and it had age related issues

but still running with all test results normal. It could have served more if this through

(external) fault on LV side wouldn’t have occurred due to unwrapping of insulation

tape on tertiary conductor of spare transformer.

In view of this it is proposed to condone the outage of transformer till new unit is

charged.

This is for information and deliberation of the forum.

12. comments/ suggestion on updating the “Operating procedure of Northern

Region” (agenda by POWERGRID)

In the Agenda no. 15 of 172nd OCC meeting, NRLDC has sought comments/

suggestion on updating the “Operating procedure of Northern Region” which was

further mentioned in the 173rd OCC meeting Agenda point 24.

Said document is prepared by NRLDC Under the provision of Regulation 5.1(f) of the Central Electricity Regulatory Commission (Indian Electricity Grid Code) Regulations, 2010, which stipulates that a set of detailed internal operating procedure for each regional grid shall be developed and maintained by respective Regional Load Despatch Centres, in consultation with the regional constituents for guidance of the staff of RLDC and shall be consistent with IEGC to enable compliance with the requirement of this IEGC.

Further as defined in IEGC section 5.2 (s), and para 5.3 of the Manual on Transmission Planning Criteria (Jan 2013), and also recorded at point 6.1 under the chapter 6 “Voltage Control” of the said operating procedure, the operating range of the voltage at various voltage levels of grid is as follows:

“Table 1: Voltage operating range Voltage in kV(rms)

Normal rating Emergency rating

Nominal Maximum Minimum Maximum Minimum

765 800 728 800 713

400 420 380 420 372


220 245 198 245 194

The maximum and minimum values in the above table are the outer limits and all would endeavour to maintain the voltage level well within the above limits.”

Safety and security of Grid is compromised by line switching operations during rising

trend of system parameters, already running beyond maximum limits. Considering

above and based on past experiences, following voltage limits may be incorporated in

para 6.10 under chapter-6, for guidance of the staff of RLDC, for enhanced security

of Grid operations in accordance with Grid standards and Grid Code.

a. 400kv System Range; 420 to 425kv max

b. 800kv System Range; 785 to 790kv

Switching in of such Lines shall be initiated according to normalisation/ down trend of

grid parameters to a certain level, say 410kv and 770kv. Same was also suggested in

recent PCC meeting as well.


खण्ड-ख: उ.के्ष.भा.पे्र.के. Part-B NRLDC

13. Frequent wind generation outage in Rajasthan control area:

Frequent tripping of wind generation in Rajasthan control area was discussed in 172,

173rd OCC meeting and 42nd PSC meeting. After last discussion, four numbers of

tripping also occurred in July and Aug-2020 (till 06th Aug 2020).

Details of the some recent incidents where wind generation has tripped are as below:

S. No Date and time of tripping Quantum of generation tripped (MW)

1 03.06.2020/ 17:08:15 400 MW

2 05.06.2020/ 05:13:00 1086 MW

3 26.06.2020/ 02:53:13 635 MW

4 27.06.2020/ 09:44:00 478 MW

5 28.06.2020/ 10:30:18 524 MW

6 20.07.2020/ 20:50:23 1200 MW

7 31.07.2020/ 19:47:16 700 MW

8 05.08.2020/ 09:34:02 150 MW

9 06.08.2020/ 13:50:17 1250 MW


Recent tripping after discussion in 173rd OCC meeting is highlighted in the table. For the events after last OCC meeting, it is seen that fault clearing times were 160ms (20July), 160ms (31July), 680ms(5Aug), 1240ms (6 Aug) and the voltage dip were also not also very high that would lead to tripping of wind generation. Central Electricity Authority (Technical Standards for Connectivity to the Grid) (Amendment) Regulations, 2019 mentions that “The generating station connected to the grid, shall remain connected to the grid when voltage at the interconnection point on any or all phases dips up to the level depicted by the thick lines in the following curve, namely: —VT : Actual Voltage; Vn: Nominal Voltage

SCADA plots for above mentioned trippings are attached herewith for reference (Annexure-B.I). Sudden generation tripping involving such huge quantum poses a serious risk to the Grid

stability and security and needs to be analysed and prevented in future. Same has also

been deliberated in 172nd& 173rdOCC meeting wherein Rajasthan SLDC was asked

tosubmit detailed reports for wind related tripping that are taking place in Rajasthan state

control area within 7days. Detailed report for above tripping are still awaited from

Rajasthan control area.

Apart from above in 173rd OCC meeting, NRLDC representative had asked to check the

further details of wind generation tripping in view of LVRT non-compliance, cascade

tripping or wind generation outage due to high wind speed (20m/s). It was also asked to

look into status of Plant wise wind wise data availability to REMC control centre. Replying

to the query of NRLDC, Rajasthan representative informed that wind generation outage

was primarily because of LVRT non-compliance or cascade tripping of 220/132 kV

transmission lines. Wind generation outage due to high wind speed may not be the reason.

Further plant wise details will also be asked with individual wind generators for further

clarity on these tripping

Rajasthan representative also stated that REMC control centre is not in operation and is

likely to be operationalized in the month of September this year.


Rajasthan SLDC is once again requested to share detailed investigation report along with

necessary DRs and EL so that any maloperation of protection system and/ or LVRT can be

pointed out and corrective actions can be taken in order to avoid such incidences in future.

Rajasthan representative also agreed that it is the case of LVRT non-compliance and also

submitted status of LVRT compliant wind generation as on Oct-2018 in which only 1.16GW

out of 4GW wind generation is LVRT compliant and 2.84GW is non-complaint. Wind farm

wise details of LVRT non-compliant generators including Type, make , date of

commissioning, Connecting feeders & capacity may be submitted. Possibility to make

these generators LVRT compliant by retrofitting may also be explored. Latest status

available with NRLDC is attached as Annexure-B.II.a.

Apart from above, frequent solar generation outage also occurred in Rajasthan control

area due to LVRT non-compliance at intra state connected solar generators.

In view of above, Rajasthan representative may deliberate on future course of action to

make these generators LVRT compliant in order to improve reliability and stability of the

grid. In 41st TCC & 44th NRPC Meetings held on 18th and 19th March 2019, Rajasthan

informed that petition has been filed by Rajasthan Gum Pvt Ltd in RERC and next hearing

for the petition is scheduled to be held on 26.03.2019. It was also informed that petitioner

has requested to allow funding through PSDF as cost for LVRT is very much high.

(Annexure-B.II.b).

Rajasthan SLDC may update.

Members may like to discuss.

14. Testing of primary frequency response of generators as per IEGC 5.2.g:

The Hon’ble Central Electricity Regulatory Commission (CERC), vide notification

dated 12th April 2017, had notified Indian Electricity Grid Code (Fifth Amendment)

Regulations, 2017. As per this notification has added following provison at the end of

Regulation 5.2 (g) of Part 5 of the Principal Indian Electricity Grid Code (IEGC)

Regulations:

"Provided that periodic checkups by third party should be conducted at regular

interval once in two years through independent agencies selected by RLDCs or

SLDCs as the case may be. The cost of such tests shall be recovered by the

RLDCs or SLDCs from the Generators. If deemed necessary by RLDCs/SLDCs,

the test may be conducted more than once in two years.”

In compliance of the regulation mentioned above, POSOCO has carried out

necessary actions which were shared with all the generators from time to time. In this

regard, NLDC has communicated to all the concerned generating entity.

M/s Solvina and M/s Siemens started contacting with respective power plants owner.

M/s Solvina and NTPC have communicated to NRLDC & NRPC about test being

conducted at Dadri stage-2, unit-5 during 17-21 Aug-2020.


For the benefit of all the members, M/s Solvina representative would deliver a

presentation on procedure for primary response testing in the OCC meeting.

It is for the information of the members.

15. Demand and Generation projections of Q3 2020-21 for POC charges

calculation

In line with CERC sharing of ISTS charges and losses regulation 2010 and subsequent amendments thereof, all the DICs have to submit the data for new transmission assets, Yearly transmission charges (YTC), forecast injection and withdrawal and node wise injection/withdrawal data to implementing agency for computation of PoC charges and losses for the application period. The format for data submission is available on NLDC website athttps://posoco.in/transmission-pricing/formats-for-data-submission/. NRLDC vide its letter dated 22.07.2020 had requested utilities to furnish Technical and commercial data for Oct’20-Dec’20 Q3 (2020-2021). Further, generation and load projection has been done by NLDC/RLDCs based on monthly maximum injection/demand met in the last 3 years from actual metered data and accordingly projections have been made as attached in Annexure-B.III. Utilities are requested to kindly check the data and correct anomalies, if any with valid justification. Members may please like to discuss.

16. Grid operation related issues:

a. Long outage of transmission elements:

S.

N

o.

Transmissi

on

Elements

Affected Areas

Expected/Actual

Revival date

(Deliberation in 172

OCC)

1

+/- 300

MvarStatco

m Lucknow

(PG)

STATCOM is out since 17.07.2019 due to failure of 3x173 MVA, 400/38.5kV Coupling Transformer. High voltages were observed in nearby areas during winter months. STATCOM would have helped in managing the grid voltages in the areas

_

2

400/220kV

Chamera

III(NHPC)-

Chamera

pool(PG) 2

Chamera 3 GIS Line isolator and Circuit Breaker damaged at Chamera3 GIS. Tower damaged of line, rerouting of line being carried out (one circuit in service by ERS). ~300MW of generation of Budhil and Chamera-3 is being evacuated only through one line.

POWERGRID representative informed that foundation works have started, and the line would be revived by Oct’2020.

https://posoco.in/transmission-pricing/formats-for-data-submission/

https://posoco.in/transmission-pricing/formats-for-data-submission/


and

Chamera III

HEP Bus 1

Any outage/tripping of this line would result in generation loss. Line is under outage since 14.05.2019. As per decision on meeting held on 26.06.2020, power (30MW)of SHEP connected to Lahal HEP also being evacuated through this line. Thus, both elements need to be revived at the earliest.

NHPC representative informed that bus at Chamera-3 is also expected by Oct-2020.

3

400/220kV

Bhilwara

315 MVA

ICT-1

Oil leakage in Transformer. Out since 12.05.2019. Out of two 315MVA ICTs, one ICT out of service.

Rajasthan SLDC representative informed that order placing got delayed and the ICT would be available after one year as it would be going to OEM for repair.

4

400/220kV

500 MVA

ICT-2 at

Agra(UPPT

CL)

Transformer Replacement required due to core winding problem. Out since 16.12.2019. Needed to be revived before the summer season so that N-1 compliance is ensured at 400/220kV Agra (UP).

New ICT has reached site and the commissioning works are under place. ICT is expected to be in service by mid-July 2020. UP SLDC representative informed that there has been no issue in load management at Agra (UP).

5

400/220kV

315MVA

ICT-2 at

Mundka

Tripped due to fire in ICT. 29.09.19. Need to be revived before the summer season so that N-1 compliance is ensured at 400/220kV Mundka. Demand of Delhi this year was 15% lower as compared to previous year, thus no major issues were seen at Mundka.

ICT charged on no load on 19-05-2020 at 16:08 hrs. but again tripped due to R phase OLTC Diaphragm blast Delhi SLDC representative informed that internal inspection is to be carried out by BHEL representative next week.

6

220 KV Kishenpur-

Ramban(PDD) Ckt-1

Due to heavy land slide near village Dalwas at Ramban damages occurred to 220 KV D/C KPTL at Location No :-187,188 &189 and there is every

PDD J&K representative informed that works are going on and the


apprehension of collapsing Tower Loc No 189. 220kV Ramban supplied only from 220kV Mirbazar substation

line is expected within first two-three weeks of July 2020.

7 765 KV

Anta-Phagi (RS) Ckt-2

Line tripped on 04-May-20 17:16Hrs. 765 kV Phagi-Anta Line -2 was patrolled and found that tower location No. 355,356 ,393 ,394 were bend and conductor broken. 765kV Anta-PhagiCkt 1 has been revived. Revival of ckt 2 would facilitate evacuation from Chhabra-Kawai-Kalisindh complex. Moreover, as per existing SPS scheme for 765kV Anta-Phagi, no backing down under outage of one line but tripping of one unit at Kawai, Kalisindh, Chhabra & Chhabra SC under outage of both 765kV lines.

Two towers are damaged and works are under process for tower location No. 355 & 394. Revival work is going on, but it may get delayed due to rain. Line is expected to be revived after 2-3 months. Rajasthan SLDC representative also informed that they are having communication with POWERGRID regarding tower strengthening works as design was borrowed from POWERGRID.

8

80 MVAR

Bus Reactor

AT NJPC

B-phase bushing of the 80 MVAR Bus reactor blasted at NJPC. 400 kV Bus-bar-1 protection optd. at NJPC. 17.10.19

_

9

400/220 kV

450 MVA

ICT 2 at

Panipat(BB)

Two 150 MVA banks damaged of ICT

need to be replaced.ICT tripped since

10:31 Hrs of 12/07/20.

b. Long outage of generating units

S.

No.

Generating

stn. Owner

Unit

No. Capacity Reason

Outage

Date Time

1 Bhakra HPS BBMB 3 126 Renovation and

Maintenance work

01-04-

2019 09:20

2 Bairasiul

HPS NHPC 1 60

Renovation and

Maintenance work

30-12-

2019 08:00

3 Chamera II NHPC 2 100 Turbine problem 07-08- 03:54


HPS 2019

4 Chamera II

HPS NHPC 1 100 Turbine problem

07-08-

2019 08:58

5 Kishenganga NHPC 1 110 Due to Broken Runner

Bucket problem

01-12-

2019 05:58

6 Anpara-D

TPS UPPTCL 2 500

Generator blast due to

hydrogen leakage.

13-11-

2019 14:14

7 Parbati III

HEP NHPC 1 130

Heavy jerk observed due

to fire incident at parbati-

2 power house as

reported by parbati-3

29-07-2020

23:11

Utilities are requested to expedite revivalwork of these transmission elements and

generating units and provide update on the present status.

c. N-1 non-compliance at 400/220kV ICTs: Plots for last 30 days (10.07.2020-

10.08.2020) are attached as Annexure-B.IV.

i. Punjab: Loading at Amritsar and Rajpura ICTs is above N-1 contingency

limits while that of Ludhiana, Moga and Nakodar ICTs is close to N-1

contingency limit. Although, SPS has been implemented by PSTCL at

Rajpura TPS, Punjab SLDC is requested to manage loading of ICTs below

N-1 contingency limits as this limit of TTC/ATC was agreed on confirmation

from Punjab SLDC that they shall manage loadings of ICTs below N-1

contingency limit.

ii. Haryana: In real-time also under import of 6500-7000MW, loading

of400/220kV Deepalpur, Sonepat, Kabulpur and Panipat (BBMB) ICTs (one

ICT under outage) are high (above N-1 limits occasionally).

iii. Rajasthan: N-1 non-compliance at Akal, Jodhpur, Chittorgarh and Merta

ICTs. High loading of ICTs at Akal is being observed leading to constraints in

evacuation of renewables. Apart from this loading of 400/220kV ICTs at

Chittorgarh, Jodhpur and Merta is seen to be above N-1 contingency limit for

considerable duration of time.

All SLDCs are requested to take coordinated efforts for areas under their jurisdiction

and try and ensure loading of transmission elements within their N-1 contingency

limits. Members may like to discuss.

17. Frequent forced outages of transmission elements in the month of July’20:

The following transmission elements were frequently under forced outages during the

month of July’20:


S. NO.

Element Name No. of forced

outages Utility/SLDC

1 400 KV Akal-Kankani (RS) Ckt-1 3 Rajasthan

2 220 KV Saharanpur (PG)-Shamli (UP)

(UP) Ckt-1 15 UP/POWERGRID

3 220 KV Khara (UP)-Saharanpur (PG)

(UP) Ckt-1 6 UP/POWERGRID

4 220 KV Saharanpur (UP)-Khodri (UK)

(UP) Ckt-1 5 UP/Uttarakhand

The complete details are attached at Annexure-B.V. Frequent outages of such

elements affect the reliability and security of the grid. Hence, utilities are requested to

look into such frequent outages and share the remedial measures taken/being taken

in this respect.


18. Multiple element tripping events in Northern region in the month of July’20:

A total of 26 grid events occurred in the month of July’20 of which 18 are 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 by 05-Aug-2020 is

attached at Annexure-B.VI.

Further, despite persistent discussions/follow-up in various OCC/PCC meetings, the

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

Maximum Fault Duration is 1120ms in the event of multiple element tripping at

400/220 kV CB Ganj (UP)on 26-July-20 at 12:09hrs.

Delayed clearance of fault (more than 100ms for 400kV and 160ms for 220kV

system) observed in total 7 events out of 26 grid events occurred in the month.

Members may take expeditious actions to avoid such tripping in future and discuss

the same. Moreover, utilities may impress upon all concerned for providing the

Preliminary Report, DR/EL & Detailed Report of the events in line with the

regulations.


19. Details of tripping of Inter-Regional lines from Northern Region for July’20:


A total of 15 inter-regional lines tripping occurred in the month of July’20. The list is

attached at Annexure-B.VII. Out of 15 number of trippings, 8 tripping incidents is

related to HVDC system. 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.

Members may please note and advise the concerned for taking corrective

action to avoid such trippings as well as timely submission of the information.

20. Frequency response characteristic:

Four FRC based event has occurred in the month of July-2020. Description of the

events is as given below:

Table:

S.

No.

Event

Date

Time

(in hrs.) Event Description

Starting

Frequency

(in Hz)

End

Frequency

(in Hz)

Δf

1 14-

July-20 14:11hrs

On 14th July 2020, at

14:11 Hrs Units 1,2,3

and 4 tripped at Koyna

Hydro power plant due

to DC supply fail

resulting Generation

loss of around 975MW

(as per NLDC SCADA

data)

50.00 49.96 -0.04

2 16-

July-20 16:27hrs

On 16th July 2020, 400

KV Teesta III-

Kishanganj was under

emergency outage

availed at 15:49 Hrs, to

replace gas density

monitor. At 16:27 Hrs

400 KV Rangpo-

Kishanganj tripped on

directional earth fault in

B phase at Rangpo end

and DT receipt at

Kishanganj.At the same

time, 400kV Rangpo-

50.00 49.91 -0.09


Dikchu and 400 kV

Dikchu-Teesta III also

tripped. As per NLDC

SCADA data generation

loss during the event

comes out to be 1394

MW (1285 MW and 109

MW at Teesta III and

Dikchu respectively).

3 20-

July-20 20:50hrs

On 20th July 2020,

220kV Amarsagar-

Dechu, 220kV

Amarsagar-Mada and

220kV Amarsagar-Akal

tripped at 20.50 Hrs due

to snapping of Main bus

jumper at 220kV

Amarsagar. Wind

generation loss of

approx. 1200 MW

observed as per

SCADA. No load loss

reported.

50.10 50.02 -0.08

4 22-

July-20 12:49hrs

On 22nd of July 2020 at

12:49 hrs, As reported

400/220 KV 500MVA

ICT-1 & ICT-3 at Bhadla

Rajasthan tripped due

on overcurrent. 400/220

KV 500MVA ICT-2 was

already under outage

due to PRD operation.

During the event Solar

generation loss at

Bhadla Rajasthan 1402

MW (as observed from

SCADA data).

50.03 49.96 -0.06

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:


FRC calculation of ISGS stations based on NRLDC SCADA data is tabulated below:


FRC calculation of major state generators based on NRLDC SCADA data is

tabulated below:


In line with the decisions taken during various OCC meetings, the time and

date of the FRC events were e-mailed to respective utilities. Constituents may

submit the FRC of their control areas for both the events and reason of poor

response, if observed.

Annexure-A.I

Follow up issues from previous OCC meetings

Sl.

No. Agenda point Details Status / Decision

1. Sub-stations likely to

be commissioned in

next six months.

All the concerned states were requested to submit the details of the downstream network associated specially with POWERGRID substations along with the action plan of their proposed / approved networks.

Present members confirmed the status details of downstream networks mentioned in Annexure-AI.I.

2. Progress of installing

new capacitors and

repair of defective

capacitors

Information regarding installation of new capacitors and repair of defective capacitors is to be submitted to NRPC Secretariat.

Information received from Rajasthan for month ending July 2020.

UP & Uttarakhand for month ending June 2020.

From Haryana up to February 2020.

Delhi, HP and Chandigarh up to Sep 2019

All states were requested to furnish updated status monthly.

3. 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”.

Report for the period ending Jun’2020 received from BBMB, UP, HP and DTL

From Haryana up to February 2020.

Chandigarh up to Sep 2019.

Punjab have submitted information up to Dec’2019.

All states are again requested to submit details of feeder-wise expected load relief through UFR and df/dt relays in the format enclosed at Annexure-A.2.3 of agenda of 165th OCC.

4. Status of FGD installation vis-à-vis installation plan at identified TPS

List of FGDs to be installed in NR was finalized in the 36th TCC (special) meeting dt. 14.09.2017. All SLDCs were regularly requested since 144th OCC meeting to take up with the concerned generators where FGD was required to be installed. Further, progress of FGD installation work on monthly basis is monitored in OCC

Updated status ending June 2020 received from UP and Punjab.

Rajasthan has submitted the status for period ending February 2020.

All states/utilities are requested to update status on monthly basis.

Sl.

No. Agenda point Details Status / Decision

meetings.

5. Reactive compensation at 220 kV/ 400 kV level

Sl. No.

Owner Substation Reactor Updated Status

1. POWERGRID Kurukshetra 500 MVAr TCR Anticipated commissioning: Jan-

Mar’2021

2 DTL

Peeragarhi 1x50 MVAr at 220 kV Purchase Order under DTL Board approval. Harsh Vihar 2x50 MVAr at 220 kV

Mundka 1x125 MVAr at 400 kV Only one bid received for reactors at Mundka, Bamnauli and Indraprastha sub-station after floating tender for 3 times. Now revised NIT prepared including 50MVAR reactor at Electric Lane.

Revised NIT under approval.

1x25 MVAr at 220 kV

Bamnauli 2x25 MVAr at 220 kV

Indraprastha 2x25 MVAr at 220 kV

Electric Lane 1x50 MVAr at 220 kV

3.

Punjab

Dhuri 1x125 MVAr at 400 kV Bid opening date extended due to less participation. TO be opened on 26.03.2020.

1x25 MVAr at 220 kV

Nakodar 1x25 MVAr at 220 kV

4. PTCUL Kashipur 1x125 MVAR at 400 kV Already submitted to PSDF. On

hold due to policy decision

5.

Rajasthan

Akal 1x25 MVAr PSDF funding sanctioned. Under tendering

Bikaner 1x25 MVAr

Suratgarh 1x25 MVAr

Barmer 1x25 MVAr Response awaited from TESG of PSDF. Jodhpur 1x125 MVAr

Annexure-AI.I

Sl.

No. Substation

Downstream network

bays

Commissioning

status of S/s /

Transformer

Planned 220 kV

system and

Implementation

Status

1 400/220kV,

3x315 MVA

Samba

2 nos. bays utilized

under ISTS. Balance 4

nos. to be utilized

Commissioned

(1st & 2nd –

Mar’13

3rd – Oct’16)

Bays - Mar’13

LILO of 220 kV

Bishnha –Hiranagar

D/c line.

Target completion -

Nov, 2019

220 kV D/c Samba

(PG) – Samba

(JKPDD) approved in

1st NRSCT.

No representation

from JKPDD

2 400/220kV,

2x315 MVA

New Wanpoh

6 Nos. of 220 kV bays to

be utilized

Commissioned

in Jul’14

Bays-Jul’14

220 kV New Wanpoh

-Mirbazar D/c line.

220 kV Alusteng -

New Wanpoh Line.

No representation

from JKPDD

3 400/220kV,

2x500 MVA

Kurukshetra

(GIS)

4 nos. of 220 kV bays to

be utilized

4 nos. of bays utilised for

LILO of one circuit of

Kaul-Pehowa 220 kV D/c

line at Bhadson

(Kurukshetra).

Commissioned on

07.03.2019

LILO of one circuit of

Kaul- Bastara 220 kV D/c

line

Bhadson(Kurukshetra).

Commissioned on

27.06.2019

Commissioned

in Mar’17.

220 kV D/c

Bhadson

(Kurukshetra)-

Salempur with

HTLS conductor

will be

commissioned

within a week

P.O. issued on

15.10.18.

Contract

agreement

signed on

30.11.18. Likely

date of

completion is

30.04.2020.

4 400/220 kV,

2x315 MVA

Dehradun

Out of 6 bays, only two

bays used. Balance 4

bays to be utilised.

Commissioned

in Jan’17

220 kV Dehradun-

Jhajra line.

Target completion: Nov

2021

Annexure-AI.I

Sl.

No. Substation

Downstream network

bays

Commissioning

status of S/s /

Transformer

Planned 220 kV

system and

Implementation

Status

5 Shahjahanpu,

2x315 MVA

400/220 kV

Partially utilized. Balance

4 Nos. of 220 kV bays to

be utilized.

Commissioned

in Jun/Sep’14

Shajahnapur-Azimpur

D/C line is planned,

expected by Dec,

2020

220 kV D/C

Shajahnapur-Gola

line expected by Dec,

2020

6 Hamirpur

400/220 kV 2x

315 MVA Sub-

station

(Augmentatio

n by 3x105

MVA ICT)

2 nos. bays utilized

under ISTS. Balance 6

nos to be utilized

1st-Dec’13, 2nd –

Mar’14 & 3rd

Mar’19.

4 bays-Dec’13,

2 bays-Mar’14

2 bays-Mar’19

220 kV D/C

Hamirpur-Dehan line.

Target completion –

Dec, 2020

7 Kaithal

400/220 kV 1x

315 MVA Sub-

station

July 2017 (Shifting of

transformer from

Ballabhgarh)

Commissioned 220 kV Kaithal

(PG)-

Neemwala D/C

line to be

commissioned

within a week.

8 Sikar

400/220kV,

1x 315 MVA

S/s

2 Nos. of 220 kV bays Commissioned Work order for

utilization of 2 No. of

bays placed on

13.04.2020. Site

survey completed.

9 Bhiwani

400/220kV

S/s

6 nos. of 220kV bays Commissioned 220kV Bhiwani (PG) -

Isherwal (HVPNL) D/c

line.


Nov, 2020

10 Jind

400/220kV

S/s

6 nos. of 220kV bays Commissioned LILO of both circuits

of 220kV D/c

Narwana – Mund line

at Jind (PG).


Nov, 2020

Annexure-AI.I

Sl.

No. Substation

Downstream network

bays

Commissioning

status of S/s /

Transformer

Planned 220 kV

system and

Implementation

Status

11

400/220kV

Tughlakabad

GIS

(10 no of

220kV bays)

4x 500 Commissioned RK Puram –

Tughlakabad (UG

Cable) 220kv D/c line.

Scheme will be

revised


March 2023

Okhla – Tughlakabad

220kv D/c line.

Mehrauli –

Tughlakabad 220kv

D/c line.

BTPS – Tughlakabad

220kv D/c line.

Commissioned.

Masjid Mor –

Tughlakabad 220kv

D/c line.


Dec, 2021.

12 400/220kV

Kala Amb GIS

(TBCB)

(6 nos. of

220kV bays)

7x105 Commissioned

(Jul’17)

HPPTCL has planned

one no. of 220kV D/c

line from Kala Amb

400/220kV S/s to

220/132kV Kala Amb

S/s. Details for

remaining 4 nos. of

line bays may be

provided.


Dec, 2021

Annexure-B.I

ANNEXURE-B.II.a

41st TCC & 44th NRPC Meetings (18th and 19th March, 2019) –Minutes

9

B.5 LVRT compliance by wind generation

TCC Deliberation

B.5.1 Rajasthan informed that petition has been filed by Rajasthan Gum Pvt Ltd in RERC and next hearing for the petition is scheduled to be held on 26.03.2019. He told that petitioner has requested to allow funding through PSDF as cost for LVRT is very much high.

B.5.2 MS, NRPC stated that as matter is already under consideration at regulatory commission, hence it shouldn’t be deliberated in this forum. He further informed that on 6th February 2019, CEA Technical Standards for connectivity to the Grid (amendment) regulations 2019 has been notified. As per the amended regulation, wind generating stations, wind-solar PV hybrid systems, energy storage systems and stations using inverters, getting commissioned after six months from the commencement of amended regulation, are required to have frequency response capability (generating stations with installed capacity of more than 10 MW connected to 33 kV & above), LVRT facility, HVRT facility and SCADA facility (Generating stations of 500 MW & above capacity). For remaining generating stations, earlier regulation will be applicable.

NRPC Deliberation

B.5.3 NRPC noted the deliberations of TCC.

B.6 Augmentation of 1 x 1500 MVA, 765/400 kV ICT (3rd) at Moga S/s and Provision of 125 MVAr bus reactors each at Jalandhar & Patiala

TCC Deliberation

B.6.1 Representative of PSTCL strongly objected augmentation of 1×1500 MVA, 765/400 kV ICT (3rd) at Moga S/s and informed that matter has been reverted back to Northern Region Standing Committee on Transmission (NRSCT) vide letter dated 06.12.2018. He informed that there are 2 no. of 500MVA, 765/400 kV transformer at Moga S/s which are have loading of 18% at present and further informed if 3rd transformer as proposed is commissioned, the fault level will breach 50kA as per studies. Further, he told that currently, entire ISTS injection is in west of Punjab, due to which entire 220kV network is strained. He stressed that this proposal isn’t suitable for Punjab.

B.6.2 He raised a question on how regulators were approached when minutes of the meeting were yet to be confirmed. He requested that approval for the augmentation might not be granted by NRPC forum until issue is resolved.

B.6.3 Representative of POWERGRID informed that there is no conversion of substation into GIS, it is only GIS switchgear with GIB interconnections. He also told that with existing system, LTA of 3330 MW has been granted at Bhadla and Fatehgarh and power flow would be Bhadla-Bikaner-Moga and 3500 MW power flow is expected on 765kV Bikaner-Moga. As there is no evacuation at 765 kV level at Moga S/s, the power has to be flown through 400 kV and 3rd ICT requirement couldn’t be ruled out.

ANNEXURE-B.II.b

44th TCC & 47th NRPC Meetings (10th and 11th December, 2019) –Minutes

20

B.8.16 Regarding support from synchronous condenser operation of generators, NRPC agreed

that there needs to be incentive for hydro generators for running as synchronous

condenser. A solution to this could be increasing O&M charges considering wear and

tear of machines.

B.8.17 NRLDC also raised concern on the support from synchronous condenser mode of

operation of NTPC gas stations. NTPC representative informed that they are taking up

the matter of running gas stations as synchronous condenser with their higher ups and

shall convey the same in upcoming meetings.

B.8.18 NRPC asked utilities to expedite works for commissioning of already planned reactors.

B.8.19 SLDC Rajasthan representative expressed concern that technical minimum operation

of thermal generators is required especially considering variations in demand pattern as

well as variability in renewable generation. NRPC agreed that these issue needs to be

discussed in FoR meeting so that state regulators take necessary actions.

B.9 Low Voltage Ride Through (LVRT) in Renewable generators (Agenda by

NRLDC)

TCC Deliberations

B.9.1 It was deliberated that in two grid events in Rajasthan on 07.05.2019 and 16.09.2019

large solar generation got disconnected indicating non-compliance of LVRT. During

analysis and details received from constituents, a few issues emerged viz. protection

setting, data availability, etc. In view of ongoing large RE integration, different make

of inverters coming up and such large outages on LVRT / HVRT, NRPC Sectt. called

a meeting on 13.11.2019. One of the outcomes of the meeting is forming of a

committee comprising of members from CEA, NRPC, NRLDC, and three solar

developers which would come up with guidelines to be adopted by RE generators

connected at ISTS level to avoid unintended disconnection / reduction in RE generation.

These guidelines would also be useful for states having large scale RE integration.

B.9.2 TCC concurred the formation of subgroup.

NRPC deliberations

B.9.3 NRPC approved formation of subgroup. NRPC also decided to include Rajasthan’s

representation in the sub-group.

B.10 Low Availability of bus reactor at Koldam HEP and Koteshwar HEP (Agenda by

NRLDC)

TCC Deliberations

B.10.1 NRLDC representative stated that 80 MVAR bus reactor at Koldam has been out since

07.06.2019 due to voltage regulation. During Nov’19, voltage at Koldam was above

420kV for more than 80% of time. Thus, there is need for revival of reactor at Koldam

ANNEXURE-B.III

Sl.No.

Entities Region Projections

based on 3 Years Data

Bus Name

Unit No.Installed Capacity

Gen. considered

Sub Total TOTALComments From DICs /Others

(if any)

Figure as per Comments/PoC

Data(MW) (MW) (MW) (MW) (MW) (MW)

1 Uttar Pradesh NR 9539 95392 Delhi NR 879 8793 Haryana NR 2560 25604 Uttarakhand NR 851 8515 Punjab NR 4134 41346 Rajasthan NR 7219 72197 Himachal Pradesh NR 468 468 As per data given by HP 3518 Jammu & Kashmir NR 539 5399 BBMB NR 2118 2118 As per data given by BBMB 2131

10 Chandigarh NR 0 011 Railways NR 0 012 Dadri Thermal NR 1465 1465 120013 Rihand NR 2831 2831 279514 Singrauli NR 1840 1840 185815 Unchahar NR 1451 1451 142116 Auraiya NR 453 453 15017 Dadri CCPP NR 583 583 30018 NAPS NR 413 41319 Jhajjar NR 1207 1207 As per Data given by Jhajjar 141420 DHAULIGANGA NR 287 28721 Tanakpur NR 107 10722 Koteshwar NR 345 34523 Tehri NR 1052 105224 Anta NR 332 332 As per NTPC 15025 RAAP B NR 367 36726 RAPP C NR 507 50727 AD Hydro NR 162 16228 Everest NR 100 10029 Karcham Wangtoo NR 1072 107230 Bairasul NR 110 11031 Chamera 1 NR 555 55532 Chamera 2 NR 236 23633 Chamera 3 NR 232 23234 Naptha Jhakri NR 1602 1602 As per data given by SJVN 161035 Lanco Budhil NR 71 7136 DULHASTI NR 374 37437 Salal NR 713 71338 Sewa-II NR 128 12839 URI 1 HPS NR 486 48640 URI II HPS NR 239 23941 Sree Cement NR 190 19042 Parbati III NR 370 37043 Rampur HEP NR 448 448 As per data given by SJVN 44944 KOLDAM NR 885 885 As per NTPC 79245 Kishanganga NR 295 29546 Sainj HEP NR 102 10247 Tanda Stg-2 NR 5 660 432 432 432 As per NTPC 43348 Bhadla Solar NR_RJ 0

Note:1. Projections are based on monthly maximum injection in the last 3 years from actual metered data.2. Generation forecast has been done based on the following criteria(i) If there is an increasing trend then last year average generation has been considered(ii) Otherwise average of past three year average generation has been considered

1 2 3 4

Oct-17 Nov-17 Dec-17 Oct-18 Nov-18 Dec-18 Oct-19 Nov-19 Dec-19 2017-18 Average 2018-19 Average 2019-20 Average Projected Demand for (Oct 2020 - Dec 2020) before normalization

Chandigarh 244 189 189 217 199 251 237 211 306 207 222 251 271 Delhi 4723 3965 4008 4713 3788 4417 4605 3631 5245 4232 4306 4494 4606

Haryana 7860 6593 7042 7948 6445 6865 7779 6138 7049 7165 7086 6989 6904

Himachal Pradesh 1425 1491 1560 1520 1605 1700 1542 1629 1729 1492 1608 1633 1719 1670 As per data given by HP

Jammu & Kashmir 2063 1988 2206 2285 2204 2464 2434 2193 2484 2086 2318 2370 2543 Punjab 8337 5713 6050 7990 6071 6440 7348 5503 6767 6700 6834 6539 6530

Rajasthan 10357 11215 11290 11450 11809 13276 10533 11980 13464 10954 12178 11992 12747 U ar Pradesh 17966 13247 14427 16745 15627 14706 17347 15271 17412 15213 15693 16677 17324

Uttarakhand 1920 1886 2025 1943 1897 2158 1797 1818 2233 1944 1999 1949 1970 Northern Region 50289 42390 45360 49635 44899 44899 49615 44189 51159

Notes

1. Projections are based on the past 3 years' monthly Peak Demand Met data available on the website of CEA

2. The above projections are being done for financial year 2020-2021 (Q3) i.e Oct, 2020-Dec, 2020

3. Projections are being done based on the forecast function available in MS Office Excel

DEMAND FORECAST USING PAST 3 YEARS DATA (Oct 2020 - Dec 2020)

Data given by

DICsComments

2017-18 2018-19 2019-20

As per data given by NTPC

Generation declared Commercial fromGeneration Projection (Oct 2020 - Dec 2020)

Tanda Stg-2

Annexure-B.IV

ANNEXURE-B.V

Sr No Element Name Outage Date Outage Time Reason05-Jul-20 19:13 R-N fault. As per PMU, No fault observed.06-Jul-20 00:02 B-N fault. As per PMU, No fault observed.

16-Jul-20 00:33Akal End: 86A, 86B RELAY , OVERCURRENT EARTH FAULT KAKANI END: 86 A, 86 B RELAY , DT RECEIVED. As per PMU, No fault observed.

05-Jul-20 04:59Y-N fault, 11.80km from Saharanpur(PG) end. As per PMU, Y-N fault occured, no auto-reclosing observed.

08-Jul-20 08:00 Y-N fault. As per PMU, Y-N fault occured, no auto-reclosing observed.

08-Jul-20 15:41 Y-N fault , FD-16.7 km FC(Iy)-3.82 KA, from Shamli end. As per PMU, No fault observed.

11-Jul-20 01:12 B-N fault. As per PMU, B-N fault occured, no auto-reclosing observed.

11-Jul-20 03:13

Shamli end flag: No tripping , tripped at Sahanranpur Pgcil end: B-N fault, 63.8km from saharanpur(PG) end , Fault current Ib-2.2 KA. As per PMU, B-N fault occurred and delayed clearance of 400ms with no auto-reclosing observed.

12-Jul-20 05:00B-N fault, 11.99km from Shamli end. As per PMU, B-N fault occured, no auto-reclosing observed.

15-Jul-20 22:08 R-N fault. As per PMU, R-N fault occured, no auto-reclosing observed.16-Jul-20 12:30 Transient fault. As per PMU, No fault observed.17-Jul-20 13:57 R-N fault. As per PMU, R-N fault occured, no auto-reclosing observed.18-Jul-20 03:09 Y-N fault. As per PMU, Y-N fault occured, no auto-reclosing observed.

19-Jul-20 05:22Y-N fault, 38.380 km from Shamli end. As per PMU, Y-N fault occured, no auto-reclosing observed.

24-Jul-20 04:02Y-N fault, 43.2 km from Shamli end. As per PMU, Y-N fault occured, no auto-reclosing observed.

26-Jul-20 05:12 Y-N fault. As per PMU, Y-N fault occured, no auto-reclosing observed.

26-Jul-20 21:45B-N fault. As per PMU, B-N fault occurred and delayed clearance of 400ms with no auto-reclosing observed.

30-Jul-20 23:47 Y-N fault. As per PMU, Y-N fault occured, no auto-reclosing observed.04-Jul-20 07:35 B-N fault. As per PMU, B-N fault occured, no auto-reclosing observed.12-Jul-20 20:23 B-N fault. As per PMU, B-N fault occured, no auto-reclosing observed.

15-Jul-20 05:30B-N fault, 30km from Saharanpur end, I-4.08KA. As per PMU, B-N fault occured, no auto-reclosing observed.

16-Jul-20 12:31 Transient fault. As per PMU, No fault observed.22-Jul-20 12:07 Y-N fault. As per PMU, Y-N fault occured, no auto-reclosing observed.

24-Jul-20 11:24R-Y fault, FLR, Saharanpur- 4.9KM/12.09KA. 220KV Saharanpur -nanauta conductor broke and fell on the 220 KV Saharnpur- khara line. As per PMU, Y-B fault followed by three phase fault is observed.

04-Jul-20 07:01Bus bar protection operated. As per PMU, Y-N fault occured, no auto-reclosing observed.

05-Jul-20 02:26 R-Y fault, Distance-49.92 km. As per PMU, No fault observed.

23-Jul-20 15:40R-N fault 24.4Km from KHODARI end, fault current IR--2.65 KA. As per PMU, R-N fault occurred and delayed clearance of 520ms with no auto-reclosing observed.

24-Jul-20 10:58R-N fault. As per PMU, R-N fault occurred and delayed clearance of 440ms with no auto-reclosing observed.

24-Jul-20 14:15 R-N fault, 70 km from Saharanpur end. As per PMU, No fault observed.

400 KV Akal-Kankani (RS) Ckt-1

220 KV Saharanpur(PG)-Shamli(UP) (UP) Ckt-1

220 KV Saharanpur(UP)-Khodri(UK) (UP) Ckt-1

220 KV Khara(UP)-Saharanpur(PG) (UP) Ckt-1

1

2

4

3

ANNEXURE-B.VI

Date Time within 24hrs after 24hrs Not Received within 24hrsafter 24hrs

Not Received ReceivedNot

Received

1 NR1) 35 MW Budhil HPS (IPP) - UNIT 12) 35 MW Budhil HPS (IPP) - UNIT 2

HP 1-Jul-20 11:35 DC supply failure resulted in tripping of both units at Budhil HEP. 70 0 GD-1 0 Y(HP) Y(HP) Y(HP) NA

2 NR

1) 220 KV Bhiwani-Charkhi Dadri (BB) Ckt-22) 220 KV Bhiwani-Hissar (BB) Ckt-13) 220 KV Bhiwani(HV)-Bhiwani(BB) (HVPNL) Ckt-24) 220 KV Bhiwani(HV)-Bhiwani(BB) (HVPNL) Ckt-15) 220 KV Bhiwani-Charkhi Dadri (BB) Ckt-36) 400/220 kV 500 MVA ICT 1 at Bhiwani(BB)7) 220KV Bus 2 at Bhiwani(BB)8) 220KV Bus 1 at Bhiwani(BB)9) 220 KV Bhiwani-Charkhi Dadri (BB) Ckt-110) 220 KV Bhiwani-Charkhi Dadri (BB) Ckt-411) 220 KV Bhiwani-Hissar (BB) Ckt-2

BBMB, HVPNL 1-Jul-20 12:45 Both 220kV buses at 400/220kV Bhiwani(BBMB) tripped on bus bar protection operation which resulted in tripping of all 220kV elements at Bhiwani(BBMB).

0 150 GD-1 0.09 Y(BBMB) Y(Har) Y(BBMB), Y(Har)

Y(BBMB) NA

3 NR1) 800 KV HVDC Kurukshetra(PG) Pole-32) 800 KV HVDC Kurukshetra(PG) Pole-4

POWERGRID 2-Jul-20 10:41 DC supply failure resulted in blocking of 800 KV HVDC Kurukshetra(PG) Pole-3&4. 0 0 GI-2 0 Y(PG) Y(PG) Y(PG) NA

4 NR1) 220 KV Saharanpur(UP)-Khodri(UK) (UP) Ckt-12) 220 KV Sarsawan(UP)-Khodri(UK) (UP) Ckt-13) 220 KV Khodri(UK)-Majri(HP) (UK) Ckt-1

PTCUL, UPPTCL 4-Jul-20 07:01 At Khodri, B-Phase Bus Isolator jumper damaged resulted in Bus bar protection operation. Multiple lines and units.

75 0 GD-1 0 Y(UP) Y(Utt) Y(HP) Y(UP), Y(Utt), Y(HP)

Y(UP) Y(Utt) 80ms

5 NR1) 220 KV RAPS_C(NP)-RAPS_B(NP) (NPCIL) Ckt-12) 220 KV RAPS_B(NP)-Sakatpura(RS) (RS) Ckt-1

POWERGRID, RRVPNL 4-Jul-20 13:24B-N fault occurred resulted in tripping of 220 KV RAPS_C(NP)-RAPS_B(NP) (NPCIL) Ckt-1 and 220 KV RAPS_B(NP)-Sakatpura(RS) (RS) Ckt-1 (Z-1 from RAPS-B end, fault at 17km from RAPS-B end).

0 0 GI-2 0 Y(Raj) Y(NPCIL) Y(Raj) Y(NPCIL) Y(Raj) Y(NPCIL) 80ms

6 NR

1) 220 KV Amargarh(NRSS XXIX)-Ziankote(JK) (PDD JK) Ckt-12) 220 KV Amargarh(NRSS XXIX)-Ziankote(JK) (PDD JK) Ckt-23) 220 KV Wagoora(PG)-Ziankote(JK) (PDD JK) Ckt-14) 220 KV Wagoora(PG)-Ziankote(JK) (PDD JK) Ckt-25) 220 KV Wagoora(PG)-Pampore(PDD) (PDD JK) Ckt-26) 220 KV Wagoora(PG)-Pampore(PDD) (PDD JK) Ckt-1

PDD JK 5-Jul-20 20:18 At 20:19hrs, 220kV Amargarh-Ziankote D/C and 220kV Wagoora-Zianakote D/C tripped on over current. Further, at 20:59hrs, 220kV Wagoora-Pampore D/C tripped on over current.

0 400 GD-1 0.46 Y(PG) Y(NRSS29) Y(JK) Y(PG) Y(NRSS29) Y(JK) Y(JK), Y(PG), Y(NRSS29)

NA

7 NR1) 765 KV Bara-Mainpuri (UP) Ckt-22) 765/21 kV 825 MVA GT 2 at Bara(UP)3) 660 MW Bara PPGCL TPS - UNIT 2

UPPTCL 6-Jul-20 03:15At Bara TPS(UP), B-N fault (Y-N as per PMU) occurred on 765kV Bara-Mainpuri line. Line A/R from Mainpuri end but failed to A/R from Bara end resulted in tripping of above line and running unit #2 due to loss of evacuation.

600 0 GD-1 0 Y(UP) Y(UP) Y(UP) 80ms

8 NR1) 220 KV Chamera_3(NH)-Chamba(PG) (PG) Ckt-12) 220 KV Chamera_3(NH)-Budhil(LB) (LB) Ckt-1

Lanco Budhil, POWERGRID

6-Jul-20 17:21Due to maloperation of relay during testing of SPS at Chamera-3 HEP, 220kV Chamera_3-Chamba(PG) ckt-1, 220kV Chamera_3-Budhil, running units at Chamera-3 and Budhil HEPs tripped.

225 0 GD-1 0 Y(PG) Y(NHPC), Y(HP) Y(PG) Y(NHPC), Y(HP)

Y(NHPC) NA

9 NR1) 220 KV Mainpuri(PG)-Ferozabad(UP) (UP) Ckt-12) 220 KV Agra(PG)-Firozabad(UP) (UP) Ckt-2

UPPTCL 10-Jul-20 11:20At 220kV Ferozabad(UP), R phase isolator clamp of 220kV main-bus of 220kV Ferozabad(UP)-Mainpuri(PG) melted resulted in tripping of both 220kV ckts viz. 220kV Ferozabad(UP)-Mainpuri(PG) and 220kV Ferozabad(UP)-Agra(PG).

0 0 GI-1 0 Y(PG), Y(UP) Y(PG), Y(UP) Y(PG), Y(UP) NA

Preliminary Report receipt status DR/EL receipt statusDetailed Report receipt

status Fault Clearance

time (in ms)

Event(As reported)

Generation Loss(MW)

Load Loss(MW)

Category as per CEA Grid

StandardsS.No. Region Name of Elements

(Tripped/Manually opened)Owner/ Agency

OutageEnergy Unserved (in

MU)

ANNEXURE-B.VI



Received



time (in ms)

Event(As reported)

Generation Loss(MW)

Load Loss(MW)





MU)

10 NR

1) 400/220 kV 315 MVA ICT 3 at Bareilly(UP)2) 400 KV Bareilly(UP)-Bareilly(PG) (PG) Ckt-13) 400KV Bus 2 at Bareilly(UP)4) 400KV Lucknow_1(PG)-Unnao(UP) (PG) Ckt-1

POWERGRID, UPPTCL 11-Jul-20 14:19

LBB of 400kV Bareilly - Unnao ckt-1 operated which tripped 400kv Bus coupler and tripped 400kv PG-1 line and 315MVA ICT-3 connected to main bus-II. As per PMU, No fault is observed in the system. In antecedent conditions, 400 KV Bareilly(UP)-Bareilly(PG) (PG) Ckt-1 & 400KV Lucknow_1(PG)-Unnao(UP) (PG) Ckt-1 carrying 76MW & 255MW respectively.

0 0 GI-2 0 Y(UP), Y(PG) Y(UP), Y(PG)

Y(UP) NA

11 NR1) 800 KV HVDC Kurukshetra(PG) Pole-42) 800 KV HVDC Kurukshetra(PG) Pole-2

POWERGRID 13-Jul-20 11:35 At 1135Hrs, Control got wrong status of HVHS breaker and generated CAT-B fault. Due to CAT-B fault Pole-2 & Pole-4 blocked. As per PMU, No fault is observed in the system.

0 0 GI-2 0 Y(PG) Y(PG) Y(PG) NA

12 NR1) 400/220 kV 500 MVA ICT 2 at Lucknow(UP)2) 400/220 kV 500 MVA ICT 1 at Lucknow(UP)

UPPTCL 14-Jul-20 02:31

Bus-Bar Protection operated at 220 kV Sub-Station Sarojini Nagar Lucknow due to which 400/220 kV 500 MVA ICT 1 & ICT 2 tripped at Lucknow(UP). As per PMU, R-N fault with delayed clearance is observed in the system. In antecedent conditions, 400/220 kV 500 MVA ICT 1 & ICT 2 at Lucknow(UP) carrying 168MW & 170MW respectively.

0 200 GD-1 0.17 Y(UP) Y(UP) Y(UP) 280ms

13 NR1) 220 KV Bhiwadi(PG)-Bhiwadi(RS) (RS) Ckt-12) 220 KV Bhiwadi(PG)-Bhiwadi(RS) (RS) Ckt-2

RRVPNL 16-Jul-20 15:22

220 KV Bhiwadi(PG)-Bhiwadi(RS) (RS) Ckt-1 tripped on B-N fault, 1.42 Km from Bhiwadi(PG) end. 220 KV Bhiwadi(PG)-Bhiwadi(RS) (RS) Ckt-2 tripped on Z2, R-N fault, 7.26 Km from Bhiwadi(PG) end. As per PMU, R-B fault followed by R-N fault is observed in the system. In antecedent conditions, 220 KV Bhiwadi(PG)-Bhiwadi(RS) (RS) Ckt-1 & 2 carrying 137MW & 129MW respectively.

0 275 GD-1 0.34 Y(PG), Y(Raj) Y(PG) Y(Raj) Y(PG), Y(Raj) 280ms

14 NR

1) 110 MW Vishnuparyag HPS - UNIT 42) 110 MW Vishnuparyag HPS - UNIT 23) 110 MW Vishnuparyag HPS - UNIT 14) 110 MW Vishnuparyag HPS - UNIT 3


All the four nos. unit at 4X100 kV Vishunuprayag (Hydro generating Station) tripped due to butter fly valve closed. Generation loss 400 MW (approx.). As per PMU, No fault is observed in the system. In antecedent conditions, 400kV Vishnuprayag-Alaknanda & 400kV Vishnuprayag-Muzaffarnagar carrying 121MW & 390MW respectively.

400 0 GD-1 0 Y(UP) Y(UP) Y(UP) NA

15 NR1) 400/220 kV 500 MVA ICT 1 at Bhiwani(BB)2) 220KV Bus 1 at Bhiwani(BB)3) 220KV Bus 2 at Bhiwani(BB)

BBMB 18-Jul-20 11:45

220 Bus Bar protection operated on Bus I and II at Bhiwani(BBMB) s/s. All 220kV lines tripped along with ICT-1 (500MVA). As per PMU, Y-N fault with delayed clearance is observed in the system. In antecedent conditions, 400/220 kV 500 MVA ICT 1 at Bhiwani(BB) carrying 262MW.

0 250 GD-1 0.09 Y(BBMB) Y(BBMB) Y(BBMB) 360ms

16 NR

1) 220 KV Meerut(PG)-Nara(UP) (PG) Ckt-12) 220KV Bus 1 at Meerut(PG)3) 400/220 kV 315 MVA ICT 1 at Meerut(PG)4) 220 KV Meerut(PG)-Modipuram(UP) (PG) Ckt-15) 220 KV Meerut(PG)-Charla(UP) (UP) Ckt-16) 220 KV Meerut(PG)-Jagriti Vihar (UP) (UP) Ckt-17) 400/220 kV 315 MVA ICT 3 at Meerut(PG)


At 13:35 Hrs, R-N phase fault detected in 220 kV Meerut-Nara but fault could not be cleared by its 220 kV CB and resulted in operation of LBB which tripped 220 kV BUS-I at Meerut and tripping of all associated elements. As per PMU, R-N fault with delayed clearance is observed in the system. In antecedent conditions, 400/220 kV 315 MVA ICT 1 at Meerut(PG) & 400/220 kV 315 MVA ICT 3 at Meerut(PG) carrying 117MW & 118MW respectively.

0 0 GI-2 0 Y(PG), Y(UP) Y(PG), Y(UP) Y(PG) 360ms

17 NR1) 400 KV Gorakhpur(PG)-Muzaffarpur(PG) (POWERLINK) Ckt-12) 400 KV Gorakhpur(PG)-Muzaffarpur(PG) (POWERLINK) Ckt-2

POWERLINK 20-Jul-20 07:06

400 KV Gorakhpur(PG)-Muzaffarpur(PG) (POWERLINK) Ckt-1 tripped on B-N fault, F/C-2.279KA, F/D-287 km from Gorakhpur end. At the same time, 400 KV Gorakhpur(PG)-Muzaffarpur(PG) (POWERLINK) Ckt-2 also tripped. As per PMU, B-N fault with delayed clearance is observed in the system. In antecedent conditions, 400 KV Gorakhpur(PG)-Muzaffarpur(PG) (POWERLINK) Ckt-1 & 2 carrying 309MW & 313MW respectively.

0 0 GI-2 0 Y(PG) Y(PG) Y(PG) 320ms

18 NR1) 220 KV Akal-Amarsagar2) 220 KV Amarsagar-Mada3) 220 KV Amarsagar-Dechu


As reported by SLDC Rajasthan, 220kV Amarsagar-Dechu, 220kV Amarsagar-Mada and 220kV Amarsagar-Akal tripped at 20.50 Hrs due to snapping of Main bus jumper at 220kV Amarsagar. As per PMU, R-B fault is observed in the system. Wind generation loss of approx. 1200 MW observed as per SCADA. No load loss reported.

1200 0 GD-1 0 Y(Raj) Y(Raj) Y(Raj) 160ms

19 NR1) 400/220 kV 500 MVA ICT 1 at Bhadla(RS)2) 400/220 kV 500 MVA ICT 3 at Bhadla(RS)


400/220 kV 500 MVA ICT 1 at Bhadla(RS) & 400/220 kV 500 MVA ICT 3 at Bhadla(RS) tripped due to operation of over current protection. As per PMU, fluctuations in voltage is observed in the system. In antecedent conditions, 400/220 kV 500 MVA ICT 1 at Bhadla(RS) & 400/220 kV 500 MVA ICT 3 at Bhadla(RS) carrying 541MW & 535MW respectively.

1400 0 GD-1 0 Y(Raj) Y(Raj) Y(Raj) NA

ANNEXURE-B.VI



Received



time (in ms)

Event(As reported)

Generation Loss(MW)

Load Loss(MW)





MU)

20 NR1) 220 KV Saharanpur(PG)-Sarsawan(UP) (UP) Ckt-12) 220 KV Khara(UP)-Saharanpur(PG) (UP) Ckt-1


Load loss of around 300 MW Occurred due to tripping of all the emanating 220 kV lines at Nanauta (UP). As observed from SCADA, tripping of 220 kV Shamli- Nanauta line occurred initially which lead to tripping of 220kV Nanauta-Saharanpur(PG) due to overloading. As per PMU, Y-B fault followed by three phase fault is observed in the system. In antecedent conditions, 220kV Nanauta-Saharanpur(PG) & 220 kV Shamli- Nanauta carrying 194MW & 43MW respectively.

0 300 GD-1 1 Y(PG) Y(UP) Y(PG) Y(UP) Y(PG) 80ms

21 NR1) 400/220 kV 315 MVA ICT 1 at Bikaner(RS)2) 400/220 kV 315 MVA ICT 2 at Bikaner(RS)


The incident occurred due to the closing of line CB of 220 kV BKN-GJNR-1 feeder with the EB switch closed at 17:49:05 hrs. Due to this the 220 kV side Bus Bar protection operated resulting in the opening of CB’s of 220 kV side of ICT1, ICT2 and other 220 kV feeders connected to the Bus. As per PMU, Y-B fault is observed in the system. In antecedent conditions, 400/220 kV 315 MVA ICT 1 & ICT 2 at Bikaner(RS) carrying 157MW & 162MW respectively.

0 200 GD-1 0.3 Y(Raj) Y(Raj) Y(Raj) 80ms

22 NR

1) 220 KV Tanakpur(NH)-CBGanj(UP) (PG) Ckt-12) 220 KV Sitarganj(PG)-CBGanj(UP) (PG) Ckt-13) 220KV Bus 1 at CBGanj(UP)4) 220KV Bus 2 at CBGanj(UP)5) 31.42 MW Tanakpur HPS - UNIT 16) 31.4 MW Tanakpur HPS - UNIT 27) 31.4 MW Tanakpur HPS - UNIT 38) 70 MW Dhauliganga HPS - UNIT 19) 70 MW Dhauliganga HPS - UNIT 210) 70 MW Dhauliganga HPS - UNIT 3

NHPC, POWERGRID 26-Jul-20 12:09

220 kV CBganj-Badaun tripped resulting in operation of Bus bar protection at CBganj causing tripping of both bus along with all 220kv line from substation.90 MW Unit 1, Unit 2 and unit 3 of NHPC TANAKPUR tripped at 12:09 Hrs along with tripping of 220kV Bus 1 and 2 at Cbganj, 220 kV CBGANJ-SITARGANJ line, and CBGANJ-TANAKPUR line tripped on Zone-4 protection. 210MW Unit 1,2 and Unit 3 of NHPC DHAULIGANGA also tripped. 220KV BAREILLY(UP)- PANTNAGAR(UK), and 132KV SITARGANJ(PG)- SITARGANJ(UK) tripped resulting in load loss of 200MW in Uttarakhand control area. As per PMU, R-B fault with delayed clearance is observed in the system. Load loss of around 300MW also observed in UP control area.

300 500 GD-1 0.39 Y(NHPC) Y(PG), Y(UP) Y(NHPC) Y(PG) Y(UP) Y(PG) Y(NHPC), Y(UP)

1120ms

23 NR

1) 400 KV Singrauli(NT)-Lucknow(UP) (PG) Ckt-12) 400/220 kV 500 MVA ICT 1 at Lucknow(UP)3) 400 KV Unnao-Lucknow (UP) Ckt-14) 400KV Bus 1 at Lucknow(UP)5) 400/220 kV 500 MVA ICT 2 at Lucknow(UP)6) 400KV Bus 2 at Lucknow(UP)7) 400 KV Lucknow_1(PG)-Lucknow(UP) (PG) Ckt-18) 400 KV Lucknow(UP)-Bareilly(PG) (PG) Ckt-19) 50 MVAR Bus Reactor No 1 at 400KV Lucknow(UP)


400kv bus bar protection operated at 400/220kV Lucknow(UP) due to falling of kite wire on 400kv bus-coupler which caused operation of 400kv bus bar protection and tripped the associated elements. As per PMU, R-B fault is observed in the system. In antecedent conditions, 400/220 kV 500 MVA ICT 1 & 500 MVA ICT 2 at Lucknow(UP) carrying 226MW & 231MW respectively.

0 0 GI-2 0 Y(UP), Y(NTPC) Y(PG) Y(NTPC) Y(PG) Y(UP) Y(UP), Y(PG) 80ms

24 NR

1) 220 kV Bhadla-Baap2) 220 kV Bhadla-Badisid3) 220 kV Bhadla-Saurya Urja Ckt-14) 220 kV Bhadla-Saurya Urja Ckt-2


tripping of 220kV Bhadla(RS)-Badsid, 220kV Bhadla(RS)-Saurya Urja (Ckt 1&2) and 220kV Bhadla-Baap transmission lines lead to a generation loss of approximately 500MW. Supply failed due to snapping of jumper between Main Bus-I and Main Bus-I isolator at 220kV Bhadla. As per PMU, B-N fault is observed in the system.

500 0 GD-1 0Y(Raj),

Y(Saurya)Y(Raj),

Y(Saurya)Y(Raj),

Y(Saurya)160ms

25 NR

1) 130 MW Parbati III HEP - UNIT 32) 130 MW Parbati III HEP - UNIT 23) 400 KV Parbati_2(NH)-Parbati Pooling Banala(PG) (PKTCL) Ckt-14) 130 MW Parbati III HEP - UNIT 45) 130 MW Parbati III HEP - UNIT 16) 400 KV Parbati_2(NH)-Sainj(HP) (UNDEF) Ckt-17) Parbati II HEP - UNIT 28) 200 MW Parbati II HEP - UNIT 49) 50 MW Sainj HEP - UNIT 110) 50 MW Sainj HEP - UNIT 2

HP, NHPC, PSTCL 29-Jul-20 23:11

Fire Incident occurred at Bus Duct at Parbati II station leading to tripping of 400 KV Parbati_2(NH)-Parbati Pooling Banala(PG) (PKTCL) Ckt-1 and units at 400kV Parbati II, 400kV Parbati III & 400kV Sainj. Hydro generation loss of 700 MW(approx.) occurred at Parbati III(520MW), Parbati II(72MW) and Sainj(108MW). As per PMU, R-N fault with delayed clearance is observed in the system. In antecedent conditions, 400 KV Parbati_2(NH)-Parbati Pooling Banala(PG) (PKTCL) is carrying 212MW.

700 0 GD-1 0 Y(PG), Y(HP) Y(NHPC) Y(PG), Y(HP)

Y(NHPC) Y(HP) Y(NHPC) 960ms

26 NR1) 220 KV Akal-Amarsagar2) 220KV Akal-Mada3) 220KV Amar Sagar-Mada


R-Phase jumper of 220KV Amar Sagar-Akal line broken leading to tripping of 220KV Amar Sagar-Akal, 220KV Akal-Mada & 220KV Amar Sagar-Mada. As per PMU, R-N fault is observed in the system. 220KV Amar Sagar-Akal, 220KV Akal-Mada & 220KV Amar Sagar-Mada carrying 198MW, 215MW & 180MW respectively. Wind generation loss of around 700MW is observed(as per SCADA data).

700 0 GD-1 0 Y(Raj) Y(Raj) Y(Raj) 160ms

Northern Regional inter regional lines tripping for June-20 Annexure-B.VII

Date Time Date Time

1500 KV HVDC Mahindergarh(APL)-Adani Mundra(APL) (UNDEF) Ckt-1

APL 1-Jul-20 06:04 Nil

Tripped from HVDC Mahendragarh end due to NO CHECK BACK SIGNAL received from VALVE BASE ELECTRONICS SYSTEM.

NA 1-Jul-20 07:53 NA NO NO

2 800 KV HVDC Kurukshetra(PG) Pole-03 POWERGRID 2-Jul-20 10:41 NilDue to transient disturbance in Pole-3, Pole-4 station DC Supply failure at Kurukshetra end.

GI-2 2-Jul-20 11:55 NAYES(After

24Hrs)YES(After

24Hrs)

3 800 KV HVDC Kurukshetra(PG) Pole-4 POWERGRID 2-Jul-20 10:41 NilDue to transient disturbance in Pole-3, Pole-4 station DC Supply failure at Kurukshetra end.


24Hrs)YES(After

24Hrs)

4 400 KV Varanasi-Biharshariff (PG) Ckt-2 POWERGRID 4-Jul-20 15:12 NilTripped due to L/R trip on REF at Varanasi causing tripping of line.

NA 4-Jul-20 18:17 NA YES YES

5 400 KV Balia-Patna (PG) Ckt-2 POWERGRID 7-Jul-20 20:48 NilB-N fault, Line tripped only from balia end, 126km from balia end, fault current-3.89 kA.

NA 7-Jul-20 21:39 NAYES(After

24Hrs)YES(After

24Hrs)

6 800 KV HVDC Kurukshetra(PG) Pole-4 POWERGRID 13-Jul-20 11:35 NilPole tripped due to wrong status of HVHS switch at Kurukshetra.

GI-2 13-Jul-20 13:01 NA YES YES

S. No. Name of Transmission Element Tripped Owner/ Utility

OutageLoad Loss/ Gen. Loss

Brief Reason(As reported)

Category as per CEA

Grid standards

Restoration # Fault Clearance

Time(>100 ms for 400 kV and 160 ms for

220 kV)

*FIR Furnished (YES/NO)

DR/EL provided in 24 hrs(YES/NO)


Date Time Date TimeS. No. Name of Transmission Element Tripped Owner/ Utility



Category as per CEA

Grid standards



220 kV)



7 800 KV HVDC Kurukshetra(PG) Pole-2 POWERGRID 13-Jul-20 11:35 NilPole tripped due to wrong status of HVHS switch at Kurukshetra.

GI-2 13-Jul-20 12:44 NA YES YES

8 220 KV Auraiya(NT)-Malanpur(MP) (PG) Ckt-1 POWERGRID 15-Jul-20 04:41 NilR-N fault, F/C-1.318KA, F/D-108 km from Auraiya end.


24Hrs)YES(After

24Hrs)

9400 KV Gorakhpur(PG)-Muzaffarpur(PG) (POWERLINK) Ckt-2

POWERLINK 20-Jul-20 07:06 Nil B-N fault. GI-2 20-Jul-20 08:25 NAYES(After

24Hrs)YES(After

24Hrs)


POWERLINK 20-Jul-20 07:06 NilB-N fault, F/C-2.279KA, F/D-287 km from Gorakhpur end.


24Hrs)YES(After

24Hrs)

11 800 KV HVDC Agra(PG) Pole-2 POWERGRID 21-Jul-20 21:01 NilDC line fault, FD-209.1km from Agra end.


24Hrs)YES(After

24Hrs)

12 800 KV HVDC Agra(PG) Pole-4 POWERGRID 21-Jul-20 21:01 NilDC line fault, FD-209.1km from Agra end.


24Hrs)YES(After

24Hrs)

13 800 KV HVDC Agra(PG) Pole-1 POWERGRID 21-Jul-20 21:42 Nil Fire trip indication in valve hall. NA 21-Jul-20 22:58 NAYES(After

24Hrs)YES(After

24Hrs)


Date Time Date TimeS. No. Name of Transmission Element Tripped Owner/ Utility



Category as per CEA

Grid standards



220 kV)



14 400 KV RAPS_D(NP)-Shujalpur(PG) (PG) Ckt-1 POWERGRID 28-Jul-20 23:22 Nil DT Received at RAPP end. NA 29-Jul-20 06:43 NOYES(After

24Hrs)YES


POWERLINK 31-Jul-20 10:11 Nil B-N fault. NA 31-Jul-20 11:44 NAYES(After

24Hrs)YES(After

24Hrs)

1Fault Clearance time(>100ms for 400kV and >160ms for 220kV)

2 DR/EL Not provided in 24hrs3 FIR Not Furnished4 Protection System Mal/Non Operation5 A/R non operation 1. CEA Technical Standard of Electrical Plants and Electric Lines: 43.4.C 2. CEA Technical Planning Criteria

# Fault Clearance time has been computed using PMU Data from nearest node available and/or DR provided by respective utilities ( Annexure- II)*Yes, if written Preliminary report furnished by constituent(s)R-Y-B phase sequencing (Red, Yellow, Blue) is used in the list content.All information is as per Northern Region unless specified.^^ tripping seems to be in order as per PMU data, reported information. However, further details may be awaited.

1. IEGC 5.2(r) 2. CEA Grid Standard 15.31. IEGC 5.9.6.a 2. CEA Grid Standard 12.2 (Applicable for SLDC, ALDC only)1. CEA Technical Standard of Electrical Plants and Electric Lines: 43.4.A 2. CEA (Technical Standards for connectivity to the Grid) Regulation, 2007: Schedule

Reporting of Violation of Regulation for various issues for above tripping

1. CEA Grid Standard-3.e 2. CEA Transmission Planning Criteria

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