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e- mail: nrpcprotection@gmail.com
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Fax : 26865206
भारत सरकार
उ र क्षेत्रीय िवद्युत सिमित
18-ए, शहीद जीत िसहं मागर्, कटवािरया सराय नई िद ली – 110016
Government of India
Northern Regional Power Committee
18-A, Shaheed Jeet Singh Marg, Katwaria Sarai, New Delhi-110016
No. NRPC/OPR/107/01/
Dated: 11.12.2013
FAX MESSAGE
From : Superintending Engineer (O), NRPC.
To
: Members of Protection Sub-Committee
1. Director (P&C)/BBMB, Chandigarh, Fax-0172-2652054
2. General Manager (O&M) DTL, New Delhi, Fax-23221059
3. GM (O&M), Delhi Transco Limited, New Delhi, Fax-011-23236462
4. GM (T), Common Services IPGCL, New Delhi, Fax-23370247
5. Chief Engineer (TS), HVPNL, Panchkula, Fax-0172-2591244
6. SE (M&P), HVPNL, Dhulkote , Haryana, Fax-0172-2540014
7. SE (Tech).,HPGCL,Fax-0172-5022436,SE(O&M-VI),Panipat Fax:0180-2566768
8. SE (Protection Circle), HPSEB Ltd., Hamirpur, Fax-01972-221150
9. Chief Engineer (Comml. & Survey Wing) PDD, Jammu, Fax-0191-2474233
10. Chief Engineer (P&M), PSTCL, Ludhiana, Fax-0161-2741280, 2451491
11. CE (M&P), RRVPNL, Jaipur, Fax-0141-2291891
12. SE (Electrical), RRVUNL, Suratgarh, (Rajasthan), Fax-01509-245299
13. Superintending Engineer (T&C), UPPCL, Meerut (U.P.), Fax-0121-2666062
14. Chief Engineer, (L-2), UPRVUNL Lucknow, Fax-0522-2287822, 2287880
15. DGM (T&C), PTCUL, Dehradun, Fax-0135-2760331
16. Chief Engineer (O&M), NHPC, Faridabad, Fax-0129-2272413
17. NPCIL
(I) Maintenance Superintendent, NAPS, Narora, Fax- 05734-222167
(II) Maintenance Superintendent, RAPS, Rawatbhata, Fax- 01475-242060
18. GM (O&M) NR – I, PGCIL, New Delhi, Fax-011-26601079
19. GM (O&M), NR-II, PGCIL, Jammu, Fax-01951-237186
20. Chief Manager (TS), N.R.L.D.C, New Delhi, Fax- 011-26852747
21. GM (OS), NTPC Ltd., Noida, Fax-0120-2410082, 2410068
22. DGM (Maintenance), SJVNL, New Shimla, Fax- 0177-2673283
23. DGM (O&M), THDC India Ltd., Tehri Garhwal, Fax No 01376-236305
24. Director (GM division), CEA, New Delhi, Fax-011-26109750
25. General Manager, APCLP, Fax No. 01251-266326
26. Director, JPPVL, Fax- 0120-4516201/4609464/4609496
27.Assistant Vice President, BRPL, Fax- 39996055, 39999765
28. GM (Production), Jhajjar Power Ltd., Fax- 01251-270155
29. Managing Director, APL, Fax No. 0124-2555342
Sub:-Minutes of the 23rd Protection sub Committee Meeting.
The 23rd Protection Sub-Committee Meeting was held on 05th Sept., 2013 at NRPC, New
Delhi. The minutes of this meeti
ng are available on NRPC website at
http://www.nrpc.gov.in
Sd/(Ajay Talegaonkar)
SE (Operations) & Member Convener PSC
Summary record of discussions held in the 23rd
meeting held on 05th Sept., 2013 at NRPC
Protection Sub-Committee
The list of participants is enclosed at Annexure-I.
A.1 Confirmation of minutes of 22nd meeting of protection sub-committee.
The sub-committee confirmed the minutes of 22 nd meeting of Protection Sub-committee,
held on 22nd July, 2013 issued vide letter no. NRPC/OPR/107/01/2013 dated 30.08.2013.
A.2 Tripping since last PSC meeting
a. Multiple element tripping at 220kV Simbhaoli Station on 22nd July 2013
at 08:21 hrs
Event category: not yet final
Loss of load: Report awaited from SLDC U.P.
Representative of NRLDC informed that
from the preliminary report from
nd
SLDC, UP, it appears that at 08:21hrs of 22 July 2013, Y (Yellow)-PHASE to
GROUND fault occurred in 220k V Simbhaoli-Mator(PG) line. As per telephon ic
conversation both Distance Protection and Earth Fault Back-up Protection for
the line operated but the ci rcuit breaker at Simbhaoli did not trip. Under such
condition, the LBB protection should have operated to clear the concerned Bus
Bar at Sim baholi. However, as reported there is no Bus-Bar protection/LBB
protection. As per DR of the line fr om Meerut (Mator) end, only Y phase had
opened and it had rec losed after approx 1200 ms and then all 3 phases of the
line had got opened. Other tripped elements are given below:
1) 220kV Simbhaoli-Mator(PG) ckt
2) 220kV Simbhaoli-Narora ckt
3) 220kV Simbhaoli-Shatabdi Nagar ckt
4) 220/132kV ICT-1&2 at Simbhaoli
As per PMU data, the DR time of Meer ut and PMU is matching and total fault
clearing time was 1400 ms.
Representative of UPPTCL in formed that there was a transient fault in 220 kV
Simbholi-Matore line and line was charged via Transfer Bus Coupler (TBC).
The TBC did not trip and f ault was not cleared from re motes ends. Later it was
found that non-tripping of TBC was because the tran sfer scheme for Matore
line was not operational. Later, the scheme had been made operational.
Regarding the non-availability Bus-Ba r/LBB protection and DR/EL at 220kV
Simbhaoli Station, U PPTCL informed that it would be provided by Dec ember,
2013.
Representative of NAPS informed that the relay can record 50 nos. of event as
DR and these particular events had not be en saved. NAPP was requested to
submit the detailed report within a week.
b. Multiple element tripping at 220kV Moga(PG) on 23rd
18:07 & 19:37hrs
July 2013 at
Event category: GD-1
Generation loss: Nil
Loss of load: 300MW
Representative of NRLDC info rmed that at 18:07hrs of 23 rd July 2013, 220k V
BUS COUPLER breaker of B- PHASE burst at Moga (P G), resulting into B us
fault for both the Buses. It was inferred from PMU data that initially fault was in
Blue phase and after 600ms it had also re
flected in Yellow phase. Fault
clearing time was ~1320ms. Name of the tripped elements are given below:
1) 220kV Moga(PG)-Moga(PSEB) 4ckt’s
2) 220kV Moga-Jagraon ckt
3) 220kV Moga-Ajitwal ckt
4) 400/220kV 315MVA ICT-4
5) 400/220kV 250MVA ICT-1&2
6) 400/220kV 500MVA ICT-3
Inferences from DR/EL and telephonic conversation with Moga(PG):
1) 220kV Moga(PG)-Moga(PSEB) 4 ckt’s had Differential Protection and Over
current Protection. Differential prot ection for this incident should not
operate. So Moga(PG)- Moga(PSEB) ckt’s correctly operated on over
current protection.
2) 220kV Moga-Ajitwal & M oga-Jagraon line should ope n from remote end in
Zone-2. Non-operation of Zone-2 from remote end needs to be
investigated. Finally 220kV Moga( PG)-Ajitwal ckt & 220kV M oga(PG)Jagraon ckt tripped in Zone-3R from Moga end.
3) Protection Coordination for ICT’s at Moga(PG) may be reviewed.
4) Healthiness of Bus Bar Protection at Moga(PG) needs to be reviewed.
Representative of POWERGRID informed that tender is scheduled to be op en
on 10th Sept., 2013 for Bus Bar protection and same would be replaced in next
02 months. Further, POWERGRID inform ed that they were reviewing the
protection setting at Moga(PG) and Moga(Punjab) along with PSTCL.
c. Multiple Element tripping at 765/400/220kV Unnao(UP) Station on 23rd
July 2013 at 10:21hrs
Event category: GD-1
Generation loss: Nil
Loss of load: Report awaited from SLDC U.P.
Representative of NRLDC in formed that at 10:21hrs of 23 July 2013, B p hase
to Earth transient fault occurred on 400k V Unnao Bareilly Line I at 99% of line
length from Unnao end. It had also been re ported that tripping log showed t he
issuance of relay trip command but the
line CB delayed to clear the fault
resulting into operation of Bareilly I line L BB. It further resulted into tripping of
lines/transformers connected to 400kV Bus II. Name of the tripping elements
are given below:
1) 400kV Lucknow(PG)-Unnao ckt 1
2) 400kV Bareilly-Unnao ckt 1
3) 400kV Panki-Unnao ckt
4) 400kV Bus coupler between both buses
5) 765/400kV 1000MVA ICT 1
6) 400/220kV 315MVA ICT-1
As per UPPTCL detailed report:
1) LBB relay (RAICA) of 400kV Bareilly
line I was tested for any
malfunctioning but it was f ound working perfectly. Probably the flag of LBB
was not noted down by operation staff.
2) No action was required as far as protective relays were concerned.
3) Circuit breaker of 400kV Bareilly line1 should be overhauled and timing s
must be recorded with CB analyser after overhauling.
Further, as per SoE, it seems that Breaker at Unnao end also operated but
after 141 ms of operation of Breaker at Bareilly (UP) end. As per PMU as we ll
as SoE, the breakers due to operation of LBB had tripped after 200 ms o f
tripping of Unnao end breaker of Bareilly-1 line. Therefore delayed operation of
command to the breaker at Unnao end coul d also be investigated during this
fault.
It was reported that all the lines tripped from both end exce pt 1000MVA ICT-1
and 315MVA ICT-1. Reason of non-tripping of ICT from 765kV side and 220kV
side needed to be investigated.
Representative of UPPT CL informed that Report had been submitted.
Snapshot of distance protection rela y (Siprotec) was enclosed. DR/EL
printouts were not av ailable. From the snapshot it c ould be seen that after
initiation of relay trip command of B phase (curser at C1) current became
zero(Curser at C2) after 226msec (C2-C1 ). Relay picked up at the occurrence
of B phase fault and trip command initia ted after 134msec but breaker did not
open within 200msec after trip command wh ich resulted into LBB relay to
operate. After the incidence, tripping from single phase trip relay of Gr-A and
Gr-B was checked for any wiring rela ted problem but nothing wrong was
found.
As far as non-tripping of 100MVA IC T-1 from 765Kv side and 315MVA ICT-1
from 220Kv side is concerned, it was clarified that as per scheme there was no
provision of tripping of other side of transformer when LBB operates on o ne
side of transformer.
d. Multiple tripping of 400/220kV ICT-1,2&3 at Daultabad on 27th July
2013 at 04:53hrs
Event category: GD-1
Generation loss: Nil
Loss of load: Report awaited from SLDC Haryana
Representative of NRLDC info rmed that at 04:53hr s of 27 th July 2013, all 3
ICTs tripped at 400/220kV Daultabad Stati on. From the PMU plots of Hissar
station, it was observed that there had been 2 incidents, 1st at 04:52:55:840 hrs
nd
(PMU time) and the 2
at 04:53:31:360 hrs. It had been gather
ed
telephonically that the fault was in 220 KV Manesar-Badshahpur line but the
fault was cleared by tripping of all 3 ICTs at 400/220kV Da ultabad Station.
Fault clearing time was ~680ms (1st incident) and 80ms (2nd incident). Non
operation of 220 kV line protect ions and clearance of 220kV lev el fault from
400/220kV ICT needed to be investigated and primary protection whic h failed
operate was required to be set right at the earliest.
Representative of HVPNL informed t hat R-phase LA in Badshahpur was
damaged. Further Earth Fault and Back up over current protecti on were not
working. In Manesar Main-I and Main-I were quite old and test kit for thes e
relays was not available with HVPNL. After the availability of test kit, both these
relays would be tested. Further E arth Fault relay and Over Current relay would
be provided within next 15 days.
e. Multiple element tripping at 400/220kV Jodhpur Station on 30th July
2013 at 04:04hrs & 6th Aug 2013 at 03:57hrs
Event category: GI-2
Generation loss: Nil
Loss of load: Nil
Representative of NRLDC infor med that at 04:04hrs of 30th July 2013, 400kV
Jodhpur-Merta ckt-2, 400kV Jodhpur-Aka l, 400kV Jodhpur- Rajwest ckt-1
reportedly tripped on Over Voltage. In antecedent cond ition following 400 k V
lines were already under open (manually) condition due to High Voltage:
400kV Jodhpur-Kankrauli since 01:07hrs,
400kV Jodhpur-Merta since 04:03hrs
As reported Voltage at Jodhpur Bus is ~440kV.
Similar kind of incident had again
occurred on 6th Aug 2013 at 03:57hrs,
400kV Merta-Ratangarh, 400kV Heerapura-Merta, 400kV Jodhpur-Rajwest ckt1 reportedly tripped on high voltage.
Detailed report along with DR/EL from RAJASTHAN was awaited.
Representative of RVPNL stat ed that these tripping we re due to actual over
voltage in the system. Copy of the over-v oltage setting in the area is enclos ed
as Annexure-II.
f. Multiple element tripping at 400/220kV Muradnagar Station on 31st July
2013 at 21:57hrs
Event category: GD-1
Generation loss: Nil
Loss of load: 800MW (UP may confirm about load loss)
At 21:57hrs of 31 st July 2013, all elements fr om 400/220 kV Muradnagar
substation tripped r esulting into furt her tripping of 220 kV elements in
Mauradnagar/Muzaffarnagar area. Following elements are reported to hav e
tripped in the incident:
1) 400kV Dadri-Muradnagar
2) 400kV Moradabad-Muradnagar
3) 400kV Muradnagar-Muzaffarnagar
4) 400kV Muradnagar-Panki
5) 400/220kV 315MVA ICT-I at Muradnagar.
6) 400/220kV 315MVA ICT-II at Muradnagar
7) 400/220kV 315MVA ICT-III at Muradnagar
8) 220kV Muzaffarnagar-Shamli line
Antecedent connectivity in and ar ound Muradnagar/Muzaffarnagar: 400k V
Agra-Muradnagar line was already out s ince 21:37 hrs on transient fault af ter
unsuccessful Auto reclosing. All ot her lines from 40 0 kV Muradnagar and
Muzaffarnagar were in service. 220k V Shamli, Baraut, Nanauta, Saharanpur
substations of U.P. ar e generally fed from either 400 k V Muzaffarnagar or 4 00
kV Muradnagar Station. However, after 400 kV Meerut-Muzaffarnagar incident
on 28.06.2013, shamli area load was bei ng fed from bot h the above 400 kV
Substations.
Incident details: UPPTCL had reported t hat, at 21:57:46hrs CT selection relay
mal-operated and resulted into operation of 400 kV Bus Bar
Protection at
400/220kV Muradnagar station r esulting into tripping of all the elements of at
400 kV Muradnagar s tation. Due to abov e, the Shamli load whic h was being
fed from Muradnagar end shifted to Mu zaffarnagar on 220 kV M uzaffarnagarShamli line.
The above shifting of load is supported
which is as below:
from PMU as well as SCADA data
400kV Meerut-Muzaffarnagar increased from ~650MW to ~800MW. This
800MW was fed till 21:58:01. 920hrs (~15second) an d settled d own again at
~650MW.
It has been reported that 220 kV Mu
zaffarnagar-Shamli line tripped at
21:58:01hrs due to R-Ph fault at 53k
M distance from Muzaffarnagar and
Therefore entire Shamli area was interrupted.
Thus, there were t wo events one at 21:57:46:360 hrs and other at
21:58:01:920 hrs with a gap of
15 sec as stated a bove which was als o
reflected in the PMU plots
The sub-committee agreed that following needed to be investigated:
1. Mis-operation of bus bar protection for both the busses reportedly on CT
selection relay.
2. As per SoE data and telephonic informati on while most lines had tripped
from both end after bus bar mis-operat ion at Muradnagar but some lines
tripped had tripped from one end only like 400 kV Dadri-Muradnagar from
Muradnagar end only and 400 kV
Moradabad-Muradnagar line from
Moradabad end only. This needed to be looked into.
Representative of UPPTCL inf ormed that 400 kV Bus Bar protection CT
switching relay of 315 MVA ICT-2 had been defective. Due to it secondary
currents of both main Bus-A and Bus-B in termixed resulting into operation of
Bus Bar Protection at 400 kV Muradnagar. Defective relays had been replaced.
Further 400 kV Muradnagar-Dadri line did not trip as Dadri-PH as the PL CC
seemed to be def ective. Transmission counters of both channels
had
increased.
g. Multiple element tripping at 400/220kV Muradnagar Station on 06th
August 2013 at 01:28hrs
Event category: GD-1
Generation loss: Nil
Loss of load: 450MW (UP may confirm about load loss)
Representative of NRLDC in formed that it has been r eported that at 01:28hrs
of 6th August 2013, R-phase to ground f
ault occurred in 220kV Sham liMuradnagar ckt resulting into multiple
element tripping at 400/220kV
Muradnagar station. It had been reported that R-phase conductor of 220kV
Shamli-Muradnagar ckt had snapped at Sham li end. T he above resulted into
flow of unbalanc e current in the ckt. It was reported that ICTs at 400/220k V
Muradnagar station tripped on Backup overcurrent protection. Following
elements had tripped in the incident:
1) 400/220kV 315MVA ICT-1 at Muradnagar.
2) 400/220kV 315MVA ICT-2 at Muradnagar
3) 400/220kV 315MVA ICT-3 at Muradnagar
4) 220kV Shamli-Muradnagar ckt
5) 220/132kV ICT-2 at Shamli
6) 220kV sub-station Baraut
As per PMU data, fault clearing t ime was ~10seconds. As per NRL DC SoE,
220kV Muradnagar-Shamli ckt. Had tripped a fter tripping of all the ICTs. Non
operation of line protection an d tripping of I CTs to clear the fault needed to be
investigated by UPPTCL.
It had been reported that 220/132kV ICT -2 at Shamli had tripped due to
unintentional extension of tripping co mmand. This as pect also needed to be
looked into by UPPTCL.
As per SoE at NRLDC, there was 400 ms time difference between 400/220kV
ICT-2 at 400kV Muradnagar and that of ICT-1&3 which tripped earlier. Settings
on different transformer needed to be reviewed by UPPTCL.
Representative of UPPTCL informed that further investigation was required
and a detailed report of the same would be submitted within 15 days.
h. Multiple Element tripping at Koteshwar HPS on 08th August 2013 at
21:13 hrs
Event category: GD-1
Generation loss: 180MW
Loss of load: Nil
NRLDC informed that at 21:13hrs of 8 th August 2013, 400kV 100MW Unit-2&3
along with Bus Coupler and 400kV Kote
shwar-Koteshwar (Pooling) ckt 2
tripped. As per PMU data, it seemed that there wa s no fault in the power
system. It had been repor ted that there was short ckt in the D.C. cable of unit2, which provided the initiation for LBB of Bus-2 and all the elements tripped on
mal-operation of LBB. L BB operates with the extens ion of both positive and
negative D.C. supply to the relay. Operation of relay on one set of DC supply
failure needed to be looked into. Delay in opening of R-phase (say 140ms- as
per POWERGRID DR) of Breaker at Koteshwar (P ooling) station also needed
to be looked into.
There was confusion in nomenclature of both Koteshwar-Koteshwar (Pooling )
D/C. The sub-committee advised that this aspect needed to be corrected to
avoid confusion during operation. Ther e were number of occurrences due to
human error on above count. One of such event happened on 29 May 2013,
when all the running units of Dhauliganga had tripped as both evacuating line
got opened due to different line opening from two ends due to confusion.
Representative of T HDC informed that it was foun d that line- 2/Koteshwar-1,
unit-2 & 3 were tripped as a result of initiation of busbar protection zone-2. The
same was attributed to malfunctioning of the relay.THDC was requested to
chech and test the realys to ascertain the reason f or operation of Bus Bar
protection zone-2.
i. Multiple element Over Voltage tripping in Rajasthan on 10th August
2013 at 02:58hrs
Event category: GD-1
Generation loss: 92MW
Loss of load: Nil
Representative of NRLDC info rmed that at 02:58hrs of 10 th August 2013,
400kV multiple element tripping occurred in Rajasthan system on overvoltage.
Following elements had reportedly tripped:
1) 400kV Shree Cement-Merta
2) 400kV Shree Cement-Kota
3)
4)
5)
6)
400kV Kota-Merta ckt-1
400kV Ratangarh-Merta ckt-1
400kV Jodhpur-Merta ckt-1
Shree Cement TPS Unit #2
The zero bus voltage was also observed on Bus-2 of Merta Station in SCADA.
The Shree Cement TPS had reported that



400kV Shree Cement -Merta line tripped first on DT r eceived from Merta
end
400kV Shree Cement-Kota line tripped on Over Voltage Stage-1
1 running unit (unit-2) of Shree Cement had also tripped
Representative of RVPNL stat ed that these tripping we re due to actual over
voltage in the system. Copy of the over-v oltage setting in the area is enclos ed
as Annexure-II.
j. Multiple element tripping at 220kV Zainakote (J&K) on 10th August
2013 at 23:40hrs
Event category: GD-1
Generation loss: 50MW (2x25MW at Lower Jhelum HEP)
Loss of load: 150MW (J&K may confirm about load loss)
Representative of NRLDC informed that at 23:40hrs of 10 th Aug 2013, B-phase
to Ground fault occ urred in 220kV Zainakote-Wagoora ckt-1 (tapped at
Budgam). It had been reported that dist
ance protection at Zainakote and
Wagoora had operated. Fault was at a dist ance of 14.51 km fr om Zainakote.
The total length of 220kV Zainakote-Wagoora ckt-1 is 28 km.
As inferred from DR/EL, 220k V Wagoora-Zainakote ckt-2 tripped on Zon e-2
but within 160ms. On enquiry from NR- 2, POWERGRID, it had been reported
that PLCC panel was not available at J&K end therefore sensitive setting at
Wagoora end to prevent unnecessary feeding of fault current through ICT
Since, 132kV Bemina-Rawalpura D/C and 132kV Waganpura-Habak ckt are
kept in open condition(as they are k ept open in summ er) there was no sour ce
to feed the load fed by Zainakote (exc ept Lower Jhelum) t herefore the ev ent
resulted in a loss of Lower Jhelum Generation and loss of load of that area.
Representative of POWERGRID info rmed that wherever PLCC was not
working in J&K, the setting of Zone- 2 had been reduced so as to avoid the
stress on the equipment.
The issue could not be discussed in det ail as no representat ive of PDD, J& K
was present.
k. Multiple element tripping at 132kV SEWA 2 station on 12th & 14th
August 2013 at 13:51hrs & 11:48hrs
Event category: GD-1
Generation loss: 118MW (12.08.2013) & 80MW(14.08.2013)
Loss of load: Report from J&K is awaited.
Representative of NRLDC infor med that at 13:51hrs of 12 Aug 2013, all the
running unit of 132k V SEWA2 tripped. It was reported that dip in the line
voltage from 130kV to 120kV occurred and all running unit-1, 2&3 tripped on
Overcurrent Protection of unit.
Inferences from DR/EL of SEWA2:
There was no earth fault observed into the system b ecause neutral curre nt
was of the order of 6-8A mpere. There was some di p in R&Y Phase voltage of
the lines from SEWA2. No line t ripping was reported from the area during the
incident.
The SEWA HEP had informed following
over current setting for generator
protection:
Unit Setting:
Over current setting I >>2, DT function, magnitude 7.5 A (CT
ratio 3000/5A), Time delay 100m Sec
Similar kind of inc ident again occurred on 14 Aug 20 13 at 11:48hrs when all
the running unit of 132kV SEWA2 tripped. I t was reported that dip in the line
voltage was observed and Units 2&3 tripped on Overcurrent Protection of unit.
Inferences from DR/EL of SEWA2:
There was neutral c urrent observed into the system of the order of 180
Ampere. Y Phase voltage of all the lines from SEWA2 has dropped from 74kV
(rms) to 48 kV(rms). It seems fro m DR/EL that there was f ault in the system
which got cleared after 600ms.
The sub-committee decided that a group with members from NHPC and
POWERGRID (NR-II) should review the setting and submit its report to
Protection sub-committee.
l. Multiple element tripping from 400kV Lucknow(PG) Station on 14th
August 2013 at 20:42hrs
Event category: GI-2
Generation loss: Nil
Loss of load: Nil
Representative of NRLDC informed that at 20:42:41.560hrs of 14 Aug 2013, Bphase to Earth fault occurred on 400k V Lucknow(PG)-Sohawal ckt-2. Fault
current was around 2.14kA. It was repor ted that LBB at 400kV Lucknow(PG)
station mal operated and tripped the following elements:
1) 400kV Lucknow(PG)-Sohawal ckt2
2) 400kV Bareilly (PG)-Lucknow (PG) ckt
3) 400kV Lucknow(PG)-Lucknow(765kV) ckt 1
4) 400kV Lucknow(PG)-Rosa(UP) ckt
POWERGRID NR-1 Report:
 Lucknow (PG)-Lucknow(PG) Ckt-1 Li ne differential relay tripped on outzone fault of Sohawal line and issued trip command to B-phase.
 Lucknow Ckt-1 Main Bay LBB mal operated. Even after opening of B-phase
of main CB LBB re-trip operated and opened the remaining two poles within
100 ms. Despite the main break er being open, the LBB issued Back trip
within 200 ms. This caused 400 KV Main Bus-1 to trip
 Bareilly ckt Main CB o pened since it is co nnected with Main Bus-1. Tie CB
opened due to Sohawal Line tripping since it is in the same dia.
 Rosa Line tripped from Rosa E nd due t o DT s end. As per approved
Scheme DT is sent for Bus-Bar Trip wit hout considering status of Tie CB
(except Rosa ckt, in all other ckt LBB scheme consider the status of tie CB)
 Lucknow Ckt-1 Differential Relay issue already taken up with M/s ALSTOM
and is under analysis.
 419 Bay LBB Relay needed to be tested.
 Rosa Line Approved sc heme would be modified to see Tie Breaker Status
before sending DT on Bus Bar Protection.
Lucknow-Lucknow differential protection operation for out of zone fault was
also encountered during multiple elem ent tripping at Lucknow(PG) station
on 12.06.2013.
From PMU data it seemed t
needed further clarification.
hat fault persisted for around
1000ms which
Representative of POWERGRID informed that issue of sending trip comman d
in out of zone fault in Lucknow (PG) -Lucknow(PG) Ckt-1 was already under
discussion with ALSTOM and outcome w
ould be intimated to this subcommittee as soon as matter gets reso lved. Regarding operation of LBB of
Main CB of 400kV Lucknow-Bar eilly Ckt-I, POWERGRID informed that LB B
relay had been chec ked for pick-up eleme nt & timer for re-tri p & final trip &
everything was found in or der. Further for 400kV Lucknow-Roza Ckt. status of
Tie CB was incorporated into Scheme for sending direct trip in case of bus bar
operation.
m. Multiple element tripping from 220kV Panipat (BBMB) Station on 14th
August 2013 at 17:58hrs
Event category: GD-1
Generation loss: Nil
Loss of load: 40MW (Report awaited from Haryana/BBMB)
Representative of NRLDC informed that as inferred from PMU, at 17:58:56.960
hrs, R-ph. to Earth fault occurred in
the system. Fa ult clearance time was
~800ms. Name of the elements that tripped are given below:
1) 220/132kV ICT-2
2) 220/33kV ICT-2
3) 220kV Panipat-Panipat ckt 1,2&4
4) 220kV Panipat-Narela ckt2
5) 220kV Panipat-Pipli ckt
Representative of BBMB informed that t here was a p roblem in REF setting of
ICT-2 and same is to be checked. Further detailed report of the incident would
be submitted within 15 days.
n. Multiple element tripping at 400/220kV Muzaffarnagar Station on 16th
August 2013 at 12:57hrs
Event category: GD-1
Generation loss: Nil
Loss of load: 300MW (Report from U.P. was awaited)
Following had been reported:
400 kV Muradnagar-Muzaffarn agar was under shutdown f or general
maintenance and tree cutting/trimmi ng since 11: 55hrs. 220kV ShamliMuzaffarnagar line was charged through transfer breaker at Muzaffarnagar
end.
At 12:57hrs of 16 th August 2013, B-phase t o ground fault occurred on 220kV
Shamli-Muzaffarnagar. Line distance prot ection reported to have operated but
the transfer breaker at Muzaffarnagar end did not open. Non clear ance of fault
had reportedly resulted in som e B-phase CT wire got burnt and fell down
further aggravating the si tuation. 400kV lines from Muzaffarnagar namely
Meerut and Roorkee ckt tripped from the remote end only. Following elements
had tripped:
1) 400kV Muzaffarnagar-Roorkee
2) 400kV Muzaffarnagar-Meerut
3) 220kV Bus2 of Muzaffarnagar
4) 220kV Shamli-Muzaffarnagar
From PMU it was inferred that the fault persisted for ~10sec. Non operation of
LBB protection at 220kV side of 400/ 220kV Muzaffarnagar station needed t o
be checked. Non operation of Backup earth fault or Backup overcurrent of
400/220kV ICTs at Muzaffarnagar station also needed investigation. Protection
Operation at Meerut and Roorkee also needed to be looked into.
Representative of UPPTCL inf ormed that the setting of Earth fault protection
and ICT were being reviewed. He assured
submitted within 15 days.
that the report of same would be
o. Multiple element tripping from 400kV Unnao(UP) Station on 18th
August 2013 at 12:54hrs
Event category: GI-2 or GD-1
Generation loss: Nil
Loss of load: Report awaited from UP
Representative of NRLDC informed that at 12:54hrs of 18 Aug 2013, B-ph. to
Earth fault occurred on 400kV Unnao-Bareill y ckt-1 at 99% of line length from
Unnao end as per the fault locat or. As reported, LBB operated even after the
opening of breaker of Unnao-Ba reilly(CB Ganj) ckt-1 from both ends. Simila r
kind of inc ident had occurred on 23 July 2013. Name of t he tripped elements
are given below:
1) 400kV Lucknow(PG)-Unnao ckt 1
2) 400kV Bareilly-Unnao ckt 1
3) 400kV Panki-Unnao ckt
4) 400kV Bus coupler between both buses.
5) 765/400kV 1000MVA ICT 1
6) 400/220kV 315MVA ICT-1
Representative of UPPTCL inf ormed that t he incident is similar to that of 23 rd
July, 2013. Further after this incident flag relay module of LBB protection had
been changed. 400Kv Unnao – Bareilly line had been charged from transfer bus
for overhauling of circuit breaker.
p. Multiple element tripping from 400kV Unnao(UP) Station on 23rd
August 2013 at 23:44hrs
Event category: GI-2
Generation loss: Nil
Loss of load: Report from U.P. was awaited
Representative of NRLDC informed that at 23:44hrs of 23 rd August 2013, R-ph.
to Earth fault occurred on 400k V Unnao-Panki ckt-1 at 3% of line length from
Unnao end. It was reported that
400kV Agra-Unnao and CB Ganj-Unnao
tripped due to POR scheme. It needed more clarity about the incident. Name of
the tripped elements are given below:
1) 400kV Panki-Unnao ckt
2) 400kV Agra-Unnao ckt
3) 400kV Unnao-CB Ganj ckt 1 (FSC in the ckt)
Representative of UPPTCL informed t hat 400 kV Unnao-P anki line tripped on
R phase to ground. Line succes sfully auto reclosed at Unnao end but finally
tripped at panki end on CB pole discrepancy. Further 400 kV Unnao-Agra line
tripped from Agra end only on CB pole
discrepancy at the time of fault on
400kV Unnao-Panki line. 400 kV Unnao-Baairelly c kt.-1 Line auto reclosed
from both ends at the time of trans ient E/F on 400k V Unnao- Panki line. Auto
reclosing of Bareilly Line I at Unnao end was due to series compensation on
line and adoption of Mho characteristic at Unnao end Siprotec relay.
PSC requested UPPTCL to take necessary action to rectify the problem.
q. Complete Blackout at 400kV Chabra & Kawai Station on 24th August
2013 at 20:34hrs
Event category: GD-1
Generation loss: 1400MW
Loss of load: 140 MW (Rajasthan was to confirm about Load Loss)
Representative of NRLDC informed t hat at 20:34hrs of 24 August 2013, B
phase CT of 400 KV Chhabra-Hindon line at Chhabra end busted and caught
fire which resulted in tripping of se veral 400 KV & 220 KV lines from Chhabra
power plant. Also bot h the generating units of Chhabra (2X250 MW), only unit
of Kawai (660 MW) and 2 units of Kota (2X210 MW) had reportedly tripped due
to this incident. From PMU plots (voltage, freq. & df/dt) of Ba ssi station (slide
no. 8), oscillations have been observed in the system for appr. 5 sec (20:34:05
to 20:34:10hrs-PMU time). Modal analysis showed the presenc e of red dots
which indicates slight –ve damping
in the system. Name of the tripped
elements are given below:
1. 400kV Chabra-Hindaun ckt
2. 400kV Chabra-Bhilwara ckt
3. 400kV Chabra-Kawai(Adani) ckt
4. 220kV Chabra-Kawai ckt
5. 220kV Chabra-Jhalawar ckt
6. Chabra TPS Unit #1&2
7. Kawai(ADANI) TPS Unit #1
8. Kota TPS Unit #3&5
Representative of RVPNL infor med that 400 kV Hindaun line·B' phase CT
damaged at Chhabra end which caused fault of 'R' phase CT of Adani Power .
400 kV GSS Hindaun and 400 k V Bhilwara tripped on zo ne - 2 and Bus Bar
Protection also operated subsequently at Chhabra Thermal Power Plant.
RVUNL was requested to submit the deta iled report of incident at Chhabra
Thermal Power Plant.
A.2
Status of DR/EL for 01 April 2013 to 28 August 2013
SE(O), NRPC stated t hat it had been discussed and reported in various
meetings that DR/EL along with detailed report from respective utilities is either
not received within stipulated time or not received at all. Consolidated details of
status of DR/EL for 2013-14 (till 2013-14) are given below:
Details of DR/EL status of respective constituents of Northern Region (As on 28 Aug
2013)
Type of
details
Preliminary
Report
DR, EL
Status of Details
Received
Not
received
Received
Not
received
Analysis
Report
Received
Not
received
No. of times detail
received from
respective
constituents (in %)
No. of times detail
received from respective
constituents (in No.)
Within
24hrs
More than
24hrs
Not
received
Within
24hrs
More than
24hrs
Not
received
Within
24hrs
More than
24hrs
Not
received
21
25
35
41
29
34
10
7
50
37
76
56
3
4
36
42
46
54
Further detailed Report of status of DR/EL received at NRLDC is attached in
Annexure-I.
It was requested to the utilities t o stick to the time sc hedule given in the IEG C
form submission of preliminary as well as detailed analys is report of the
disturbances.
A.3
Non-functional carrier-inter-trip feature (Agenda by BBMB)
BBMB had intimated that carrier-inter-trip feature (Carrier aided protection of
transmission line) of following lines was not enabled due to faulty PLCC channels (o f
PSTCL and HVPNL ends)
Sr.No Transmission Line (220 This end
KV)
Other
end
Status of carrier protection
1
Jamalpur-Dhandari-I&II
BBMB
PSTCL
2
Jalandhar-Butari
BBMB
PSTCL
Carrier Protection Coupler
not commissioned by PSTCL
-do-
3
Jalandhar-Jamsher-I&II
BBMB
PSTCL
-do-
4
5
6
7
8
(
C
a
r
r
i
e
r
Barnala–Lehra-Mohabbat
BBMB
PSPCL
Not Available
Samaypur-Badshahpur
BBMB
HVPNL
Carrier protection coupler not
provided by HVPNL
Samaypur-Palwal-I&II
BBMB
HVPNL
-do-
Samaypur-Palli-I&II
BBMB
HVPNL
-do-
Bhiwani-Bapora-I&II
BBMB
HVPNL
-do-
PSTCL informed that PLCC for 220 kV
Jamalpur-Dhandari-I had been made
functional and on ckt.-2 it would be made o perable within 02 months. For Sr. No 2
and 3 PST CL informed that it would be done in next 15 days. F or Sr. No 4 BBM B
was requested to take up mater with PSPCL with a copy to NRPC secre tariat. For
Sr. No 5 to 8 HVPNL informed that it would take 04 months to implement the feature.
A.4
Non- availability/ defective PLCC Link of SEBs Lines terminated at
POWERGRID NR-2 substations (Agenda by POWERGRID)
POWERGIRD had submitted a list of sub-stations where PLCC is non-functional at
other side. The list was enclosed as Annexure-II of agenda.
SE(O), NRPC informed that issue relate d to protection system would be takenup
separately with PDD J&K.
HVPNL informed that PLCC problems at Panchkula, Kaithal and Abdullapur would
be resolved in next 03 weeks as new panel were being installe d at these sites.
Further panel at Bahadurgarh was install ed and was not working. The same was
expected to be functional within a month.
PSTCL informed that PLCC at 220 kV Pak howal had been set right and for other
lines the PLCC would be made functional within 02 months.
A.5
Frequent tripping of evacuation line from Anta line (Agenda by NTPC)
NTPC had submitted a list of frequent tripping of Anta-Bhilwara line.
POWERGRID informed that they had replaced insulators at vulnerable locations in
August, 2013 and after the replacement it was expected that the tripping wou ld
reduce.
A.6 Islanding scheme for Rajasthan and NAPS
Both schemes were enclosed as Annexure-III of the agenda.
NAPS and UPPTCL were suggested to regularly review the scheme in the lig ht of
load growth in the area. Further, it was suggested that the frequency set ting of
islanding scheme should be changed to 47.9 Hz and for house load it could be
made as 47.5 Hz.
The PSC was apprehensive about inclusion of Mahi-I and II HEP in is
landing
scheme of Rajasthan as these are loca
ted at large distance from the other
generating stations included in the schem e. In the light of this RPVNL wa
s
requested to revisit the scheme and come with the revision in next PSC meeting.
A.7 Modalities and Guidelines of conducting 3rd Party Protection Audit by the
Protection Experts
The format submitted by group was enclo sed as Annexure-IV of the agenda.
Based on t he inputs of the members the Scope of work by th e group had been
finalised and same is available on NRPC website at www.nrpc.gov.in/Oper/201314/Dataformat/ProtectionAudit_Scope.pdf. The third party protection audit by the
expert group constituted of experts from various utilities has started.
A.8 Non-availability/non-functional PLCC links
SE (O), N RPC informed that in the Basi c Protection Audit, certain defects were
observed in PL CC links at P OWERGRID sub-stations. POWERGRID had
informed that they were not able to rect ify the PLCC pr oblems for links of UPPCL
at Allahabad & Kanpur and links of DTL at Mandola. The matter had already been
taken up by POWERGRID with these utilities but not progress has been made.
DTL informed that PLCC at 400 kV M andola was functional. It was agreed that
DTL and POWEREGRID would carry out the joint testing of PLCC at Mandola.
UPPTCL informed that PLCC problem would be rectified within 06 months.
A.8 Issue of LBB setting
The issue had come up for discussion whil e deliberating agenda item A.1 (h) of
22nd PSC meeting but could not be concluded. It was decided that issue of LBB
setting would be tak en up in 23 rd PSC meeting. T he setting as per uniform
philosophy is LBB Current sensor I > 20% In and LBB time delay= 200 msec.
RVPNL was of the opinion that c urrent setting for LBB should be > 80% otherwise
one of the conditions for LBB operation is always fulfilled. However there was no
consensus on the issue of setting. It was decided that matter should be referred to
CEA.
B. Follow up action on outstanding issues from previous meetings
B.1 UPPTCL was to submit the detailed r eport of Multiple Element tripping at
400/220kV Gorakhpur (UP) Station on 18 th June 2013 at 16:55hrs. UPPTCL
agreed to submit the report within a week . The same is still awaited.
B.2 UPPTCL was to submit the detailed report on multiple Tripping of 400k V line
and 400k V Muradnagar sub-station on 09 th July 2013 at 20:59hrs. UPPTCL
agreed to submit the report within a week.
B.3 It was decided in 22 nd PSC meeting that UP RVUNL, NAPS a nd UPPTCL
would carry out detailed inv estigations for tripping in April to J uly in an a round
Harduaganj and NAPS. UPRVUNL, NAPS and UPPTCL were requested to brief
the PSC about the findings.
Representative form UPPTCL informed that the
complete report would be submitted by Sept., 2013 end.
B.4 UPPTCL was to submit th e detailed report of multip le element tripping at
400/220kV Lucknow (UP) Station on 14 th July 2013 at 18:49hrs. UPPTCL agreed
to submit the report within a week.
B.5 With reference to multiple tripping of 400kV lines at 400kV Balia sub-station on
has proposed followin g grading in
20th May 2013 at 18:01hrs, POWERGRID
400kV system in case of overvoltage:
S. No. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Line Name of Circuit Length Balia‐
Biharshariff‐1 Balia‐
Biharshariff‐2 Balia‐Sohawal‐1 Balia‐Sohawal‐2 Balia‐Patna‐1 Balia‐Patna‐2 Balia‐Patna‐3 Balia‐Patna‐4 Balia‐Mau‐1 Balia‐Mau‐2 Balia‐Sasaram 241.8
Existing
Voltage Time Pickup setting 110%
5 secs
Proposed
Voltage Time Pickup setting 110% 5 secs
241.8
112%
5 secs
112% 5 secs
229.2
229.2
195
195
185
185
9.2
9.2
237.796
110%
112%
110%
110%
112%
112%
110%
112%
110%
5 secs
5 secs
5 secs
6 secs
5 secs
6 secs
5 secs
5 secs
5 secs
110% 112% 110% 110% 112% 112% 110% 112% 110% 5 secs
5 secs
5 secs
6 secs
5 secs
6 secs
7 secs
5 secs
5 secs
NRLDC stated that time setting for Ba lia-Patna-2 and Balia -Patna-4 can be
reduced to 05 seconds. Further voltage grading of 111% can also be used.
B.6 Status of bus bar protection: During 21 st and 22 nd PSC meetings u tilities
were requested to update the status Bu s Bar Protection available with NRP C
secretariat and same was enc losed as An nexure-V of agenda. O nly DTL, BBMB
PSTCL, POWERGRID, NHPC and HPSEB Ltd. had submitted the status. All other
utilities were requested to update the status of Bus Bar Protection.
C. Implementation of recommendations of the enquiry committee for grid
disturbances on 30th and 31st july 2012.
C.1 Testing of df/dt relays
It was decided in 22nd PSC meeting held on 22 nd July, 2013 that all STUs will try to
simulate the testing of df/dt and share their experience.
RVPNL informed that they had tried the
same at their sub-station and were
successful. So it was decided that from now onwards testing of df/dt would also be
simulated. SE(O), NRPC
requested other members also to share their
experience.
C.2 Self certification of UFR and df/dt relays
SE(O), NRPC informed that it was de
cided by NRPC that quarterly selfcertification regarding heal thiness of UFR and df/dt rel ays will be done by the
States. The latest status with NRPC Secretariat is as under:
S.
No.
1
2
UTILITY
STATUS
HPSEB Ltd.
DTL
3
4
5
6.
7.
RRVPNL
UPPTCL
PSTCL
BBMB
PTCUL
Submitted for quarter ending June, 2013
Submitted for month ending September,
2013
Submitted for quarter ending June, 2013
Submitted for quarter ending June, 2013
Submitted for quarter ending June, 2013
Submitted for quarter ending June, 2013
Submitted for quarter ending June, 2013
C.3 Voltage collapse relay and associated software:
SE(O), NRPC informed that in the 19 th meeting of PSC, NRLDC was requested to
look into the utility of t he voltage collapse relay and associated software from th e
point of additional input fo
r system operation. In the 20 th PSC meeting,
representative of NRL DC had stated that the issue w ill be disc ussed with WRLDC
and opinion so formed will be c onveyed later. In 21 st PSC held on 25 th June, 2013
NRLDC informed that no progress has been made so far. In 22 nd PSC meeting held
on 22nd July, 2013 representative of NRLDC had st ated that they would reply on the
issue within 15 days.
Protection sub-committee recommended t he procurement of 02 nos. voltage
collapse relay and as sociated software for NR. The modalities for the procurement
would be discussed in next PSC.
C.4 Monitoring of implementation of recommendations of protection audit
in prescribed format
As regards rectifying deficienc ies observed in basic protection audit carried out
by POWERGRID & CPRI, Member Secret ary, NRPC vide fax dated 09.01.2013
had requested utilities concerned to submit fortnightly reports in the prescribe d
formats. In the PSC meeti ng held on 05. 04.2013 it wa s decided that all t he
utilities would submit la test status as on 1 st April 2013 and thereafter the status
would be submitted on monthly basis. The latest status is as under:
S.N
o.
Utility
No. of Substations/
Switchyard
covered
under BPA
Status
Expected targeted completion of rectification of
deficiencies observed during BPA (as per status
submitted in the monthly status report)
1
UPPTCL
21
September 2014
2
UPRVUNL
4
3
RRVPNL
8
Submitted ending
August, 2013
Submitted ending
September, 2013
Submitted as on 25th
October, 2013
4
RRVUNL
2
5
HVPNL
1
6
HPGCL
3
7
PSTCL
3
8
PSPCL
1
9
DTL
1
10
HPSEB Ltd.
1
11
PTCUL
2
12
UJVNL
1
13
PDD, J&K
3
14
BBMB
7
15
POWER
GRID
46
16
NTPC
10
17
NHPC
8
Submitted ending
October, 2013
18
SJVNL
1
19
THDC
1
Submitted as on 22nd
October, 2013
Submitted as on 15th
October, 2013
20
NPCIL
1
21
Lanco Power
1
22
JPVL
3
Submitted as on 23rd
October, 2013
Submitted ending
August, 2013
Submitted as on 30th
September, 2013 (PTPSI & PSTP-II)
Submitted as on 15th
October, 2013
Submitted ending 31st
January, 2013
Submitted as on 15th
October, 2013
Submitted as on 26th
October, 2013
Submitted ending
August, 2013
Submitted ending
October, 2012
Submitted ending
October, 2012
Submitted 14th October,
2013
Submitted ending
October, 2013 for NR-I &
ending September, 2013
for NR-II.
Submitted ending
October, 2013
Submitted as on 30th
September, 2013
No observation found
during Basic Protection
Audit
Submitted ending 10th
March 2014
Specific date of anticipated completion not indicated.
However, Completion target period shown as3
months/ 4 months in every report. Reference date
from where 3 months/ 4 months begins is not clear.
2014-15. Exact target not mentioned.
BBP problems rectified.
October 2014
NIT for GPS Time synchronization of Sarna and
Govindgarh issued but anticipated date of completion
has not been mentioned.
Latest action not known
March 2014.
2013-14. Exact target not mentioned.
No specific target date mentioned.
Latest action not known
Latest action not known
Replacement of static DP to numerical by June 2014,
PLCC at 220 kV Ganguwal by September 2014 and
EL by December 2014.
Restoration of PLCC link at Allahabad and Kanpur by
UPPTCL and Mandola by DTL needs to be expedited
by UPPTCL & DTL respectively.
Replacement of static DP of Main-I & II at Anta, for
Transformer at Dadri (Gas & Thermal) and at
Unchahar (Kanpur feeders 1,2 3 & 4) by December
2014. Auto recloser at Unchahar (Kanpur feeders 1,2
3 & 4) by December 2014.
PLCC speech channel at 220 kV Bareilly feeder and
132 kV Mahendernagar is to be rectified by
POWERGRID.
By April, 2014 (During Annual Maintenance).
Requires to be indicated by POWERGRID as the
replacement of static to Numerical relays and
restoration of PLCC communication are under
jurisdiction of POWERGRID.
October 2014.
Not required
Completed.
July, 2013
D. Additional agenda by POWERGRID
D.1 Multiple trippings in 220kV feeders connected to Merrut(POWERGRID)
station:
Frequent tripping has been reported in 220kV feeders connected to 400/220k V
Merrut Sub Station. The freque nt tripping were fed by ICT at Merrut S/s whic h
created undue stress on ICT furt her deteriorating the life of equipment. Summary
of tripping from 1st June, 2013 is given below (details were enclosed as Annexure-I
of additional agenda):
Merrut-Gajraula – 09 times
Merrut-Modipuram-I – 04 times
Merrut-Modipuram-II – 05 times
Merrut-Nara – 09 times
Merrut-Nahtaur – 05 times
Merrut-Simbhaoli – 09 times
UPTCL informed that these lines were being checked and vegetation in their
vicinity was being removed.
D.2 Non-receipt of carrier 400kV Jhatikara-Bamnauli Ckt –I & II.
POWERGRID informed that during tripping of 400kV J hatikara-Bamnauli Ckt-I & II
on 12-Aug-13 & 28-Aug-13 respectively, carrier was not received in Main-II rela y
from Bamnauli end which caused the tripping of line in Zone-2 after 350msec.
Representative of DTL informed that code of Main-II relay was not received at
Jhatikra though the Code of Main-I relay was received. In this case the line should
have tripped at Jhatikra end also by Main -I on receipt of code. It appeared that
either the relay at Jhatikra end had not opera ted correctly or it w as not configured
correctly. If Main-1 relay at Jhatikra had operated correctly then fault should not
have fed for 350ms. POWERG RID was also requested to check for the faulty
relay, as it had happened several times. Moreover, every time when there is a fault
in one line, the other line also trips at PO WERGRID Jhatikra end, this should also
have been checked and rectified. POWE RGRID was asked to look into the
problem and resolve it. The matter wa s also discus sed with POWERGRID OS
Deptt and POWERGRID Jhatikra representative on 2.9.2013 and it was agreed to
take shut down of the line and check the schemes thoroughly.
It is worth mentioning that while c
harging of the line it
was agreed that
POWERGRID would lay fiber on the line and install current Differential relay and
DTL would pay for the DTL end relay and fibre on DTL portion. POWERGRID was
requested to install the current differ
ential relay as also s uggested in 17 th
Protection Sub Committee meeting.
He stated that during implem entation of setting at the time of charging DT L had
suggested that the scheme for both the relays s
hould not be the sam e, but
POWERGRID insisted to have both the schemes as POR. This also needed to be
reviewed till current differential protection is implemented.
It was agreed to check the complete schemes by both DTL and POWERGRID.
""
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1400 kV Hc er,lpur;;
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400 kV SCL Be,,w;;r
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400 kV GSS R;;: <J ngarh
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140 0 kV SI PS - ·
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11 0 %
109%
110%
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400 kV GSS Jr.rs;.; lrne r
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L:OO kV GSS Clarne c
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400 KV M e rta
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5 sec
j400 kV GSS SCL Beaw;;r
400 KV Merta
110%
5 sec
14 00 kV GSS Jodhpur
400 kV M er :;;
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coo kV .Jotlhpu_r__ ''
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!400 1.'/ Chh obrc. TPS
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400 kV Jodhpuc
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5 sec
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3 sec
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400 kV Bikancr
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400 kV 3armc r
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400 kV
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110%
400 kV Ratangar h
400 kV
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109%
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108%
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400 kV GSS Jodhpiir
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400 kV H ee r a p"~·,,
1400 kV GSS Merta City
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5 sec
400 kV GSS Hindatm
400 kiJ GSS Merta Ci:y
l 400 KIJ GSS BJs ~ i (PGCI L)
40 0 KIJ GSS 5a ssi (P GCIL)
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400 kV K<111 f. r c'•
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3 sec
Re m arks
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5 sec
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f{AJASTHAN HAJYA VIDY Ul PRASARA N N IGAM LTD .
SETT ING OF STAGE - 1 OF OVER VO LTAGE RELAYS FOR 400 KV Lin es
110%
109%
·- -- -
110%
110%
I
3 s~
-5 sec
3 sec
3 sec
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