Ph. : 26513265                                                                                                                                       e‐mail : nrebops@yahoo.com 

Fax : 26865206                                                                                                                                           Website : www.nrpc.gov.in  

Government of India 

Northern Regional Power Committee 

18‐A, Shaheed Jeet Singh Marg, Katwaria Sarai, New Delhi‐110016 

Sub: Report of the group constituted to enquire into mutiple tripping at Meerut

and Muradnagar on 28th June, 2013

Multiple trippings were observed on 220 kV Meerut-Nara, 400 kV Meerut-Muzaffarnagar, 220 kV Meerut-Modipuram circuit-I & II, 220 kV Meerut –Nehtaur, 220 kV Modipuram-Shatabdinagar, 220 kV Modipuram- Muzaffarnagar and 400 kV Muzaffarnagar –Muradnagar lines at about 11:10-11:15 hrs. on 28th June, 2013. After these trippings, Uttrakhand / part of UP at Muzaffarnagar remained connected to NEW grid only through 440 kV Moradabad- Kashipur line. To analyse the possible causes and suggest the remedial measures to avoid recurrence of such trippings in future, a group was constituted.

The group has submitted its report. A copy of the same is enclosed for kind

perusal.

Sd/- (P. K. Pahwa)

Member secretary Encl. As Above Member (GO&D), CEA, Sewa Bhavan, R.K.Puram, Sector-1 Delhi-110066

No. NRPC/OPR/105/10/2013/ Dated 21.08.2013

 

Report of the Group

to enquire into

multiple tripping

at

Meerut and Muradnagar

on 28th June, 2013

August, 2013

CONTENTS

Article Title Page No.

1.0 Background 1

2.0 Brief Description 1

3.0 Observation and Recommendations of the Group

2

Annexures

I Constitution of a Group to enquire into multiple tripping at Meerut and Muradnagar on 28th June, 2013

4

II Power Map of connectivity of

Uttrakhand and Western UP

6

III PMU Plot showing no fault at

11:10:37:465 hrs.

7

IV PMU Plot showing 220 kV

Nara-Meerut line tripping due to

failure of R-Phase conductor

between Tower nos. 78& 82

and tripping of line at both ends

8

V PMU Plot showing no fault at

11:23:48:860 hrs.

9

1 

 

Report of the Group to inquire into multiple tripping at Meerut and Muradnagar on 28th June, 2013

1.0 Background

1.1 On 28th June, 2013 at about 11:10-11:15 hours 220 kV Meerut-Nara, 400 kV

Meerut- Muzaffarnagar, 220 kV Meerut-Modipuram Circuit-1 & II, 220 kV Meerut –Nehtaur, 220 kV Modipuram-Shatabdinagar, 220kV Modipuram- Muzaffarnagar and 400 kV Muzaffarnagar-Muradnagar tripped/opened. After these trippings, Uttrakhand/part of UP load at Muzaffarnagar remained connected to NEW grid only through 440 kV Moradabad-Kashipur line and loading on this line became 780 MW. The situation was brought under control by load shedding in Uttrakhand and U.P.

1.2 In order to investigate reasons which led to above mentioned multiple trippings

and to suggest remedial measures, Member Secretary, NRPC constituted a group with following members :-

 

i) Shri Sushil Kumar, C. E. (Transmission-West) UPPTCL ii) Shri Ela Chandra Pant, S.E. (SLDC), U ttrakhand iii) Shri Rajiv Porwal, Chief Manager, NRLDC iv) Shri M.S. Hada, Deputy Manager, POWERGRID, NR-1 v) Shri Naresh Kumar, EE, NRPC-Convener

The copy of letter is enclosed as Annexure-I.

1.3 The group held its meeting on 03rd July, 2013 at NRPC, New Delhi. The analysis,

observation and recommendations of the group on these substations are as under.

2.0 Brief description of the incident

The power map of connectivity of Uttarakhand and Western UP is attached as Annexure-II. Prior to incident 400 kV Dadri-Muradnagar was already under shutdown and power flow over 400 kV Meerut-Muzaffarnagar was 780MW. At 11:10:37:465 hrs. the 400 kV Single Ckt. Meerut-Muzaffarnagar line was manually opened from Meerut end (PMU plot also shows no fault at that time and is enclosed as Annexure-III). It was intimated by representative of POWERGRID that a sparking was observed in the line isolator of this line and line was taken out to avoid the consequential damage.

After manual opening of the above line underlying 220 kV network became over loaded. Consequently, 220kV Nara-Meerut line tripped due to failure of R-Phase conductor between tower No. 78 & 82, and line tripped at both ends. (PMU plot enclosed as Annexure-IV). After tripping of 220 kV Meerut-Nara line, the load of Nara & Muzaffarnagar sub-stations was being fed through of 400 kV Muradnagar-Muzaffanagar and 220 Kv Modipuram-Muzaffarnagar via 220 kV Modipuram-Meerut (PG) Ckt-I & II. In the meantime, R-Phase jack bus conductor

2 

 

of 220kV Modipuram – Meerut Ckt-I failed due to damage of ACSR ZEBRA conductor near Gun fitting and fell down on 220 kV main A & B Bus in the switchyard of 220 kV Modipuram causing bus fault and in the absence of bus bar protection, consequential tripping of all 220kV lines from remote ends at around 11:15:35:860 hrs. at Muzaffarnagar, Meerut & Shatabdinagar. Further due to heavy loading, 400 kV Muradnagar- Muzaffarnagar line was opened manually from Muzaffarnagar end at 11:23:48:860 hrs. (PMU plot showing no fault in the system is enclosed as Annexure-V). It was informed by representative of UPPTCL that there was a heavy sparking observed by the substation personnel in B-Phase Bus side isolator. The load on this line was about 750 MW and load on 400 kV Muzaffarnagar-Roorkee was 357 MW at that time. In the meantime the Y-phase jumper of 220kV Nehtor – Meerut line failed at tower No.4.  

After these trippings, Uttrakhand and part of UP load at Muzaffarnagar remained connected to NEW grid only through 400 kV Moradabad-Kashipur line and loading on this line became 780 MW. Critically low voltages were observed at 400 kV Muzaffarnagar (of the order of 0.75 PU), 400 kV Roorkee , 400Kv Rishikesh and other 220/132 Kv substations is Uttrakhand/ Muzaffarnagar area of UP. The situation was brought under control by load- shedding in Uttrakhand and U.P. Tripping of Moradabad-Kashipur line under such situation could have resulted into tripping of entire Uttrakhand power system.  

3.0 Observations and Recommendations of the group

1. Voltage in the area had gone as low as 304 kV at Muzaffarnagar S/s and 354 kV at Kashipur s/s. Under such voltage conditions, there were chances of voltage collaps. So group felt the need to implement Under Voltage Load Shedding scheme at some of the locations. Subsequent to the disturbance Under Voltage load shedding Scheme has been made functional at 220 kV Shaharanpur substation of UP. If voltage drops to 175 kV at Shaharanpur then 132 kV Deoband (63+40), Nakur (2x40) and 132 kV Chhutmalpur(63+40) will trip. Uttrakhand should also implement the UVLSS at Kashipur, Roorkee and Rishikesh sub-stations. (Time frame: 15 days) 2. Although, voltage profile of the Western UP area has shown improvement but still voltages at Moradabad / Muradnagar area goes to 380 kV regularly. There is scope for further improvement. In voltage profile around the area. UPPTCL informed that 600 MVAR (280 MVAR on 132 kV & 320 MVAR on 33 kV) Capacitors are being planned in Western UP area (Time Frame: 01 year)

3 

 

3. The power flow on 400 kV Meerut- Muzaffarnagar line was 780 MW just before the incident, which was on the higher side. After closure of Vishnuprayag HEP due to flash flood in Uttrakhand, the power flow on this line has increased. There is a need to continuously monitor the loading on this line. Further NRLDC should be informed before manual opening of important lines so that some preventive measures can be taken for redistribution of load to avoid cascade tripping. 4. POWERGRID should do the thermo vision scanning of equipment for 400 kV Meerut sub-station on monthly basis. Similar action should also be carried out by UPPTCL/PTCUL in respect of their sub-stastions/lines in that area. (Time frame: Immediately). 5. There are two 400 kV lines i.e. 400 kV S/C Muzaffarnagar- Roorkee and 400 kV S/C Moradabad-Kashipur feeding to Uttrakhand. If any of these lines trip then underlying 220 kV network gets overloaded. So group felt the need to expedite the completion of 400 kV Bareilly-Kashipur-Roorkee line being constructed by POWERGRID. This would increase the reliability of the Uttarakhand system. POWERGRID should expedite the construction of 400 kV Bareilly-Kashipur-Roorkee line so that reliability of Uttarakhand system can be enhanced. (Time frame: December 2013)

 

 

 

 

 

 

 

 

 

4 

 

Annexure-I

5 

 

6 

 

Annexure-II 

7 

 

Annexure-III

8 

 

Annexure-IV

9 

 

Annexure-V