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Website: www.wrpc.gov.in E-mail: [email protected]

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~Phone: 022-28353222,2820 0194/95/96 ~Fax: 022-28370193Website: E-mail:

~'l«J~'l«~g 9001-200015/150: 9001-

2008

No. WRPCIPCM/SPS/20151 914 tJ Date: 02.11.2015

To,

As per mailing List

Sub: Final Report on Grid Disturbance at Akola, Akola2 and Indiabulls (Rattan India) Sub-stations in Maharashtra on 29th March 2015.

Sir,

Please find enclosed herewith the Final Report on Grid Disturbance at Akola, Akola2 andIndiabulls (Rattan India) Sub-stations in Maharashtra on 29th March 2015.

This is for your information and needful action please.

Encl. As above. .«:(so1'1(A--nC't""fc;t.'I~n $, ')Superintending Engineer ~tn.)

Mailing list

1 Chief Engineer (LD), MSETCL, Kalwa. Fax-27601769/65

2 Chief Engr. (Trans O&M), MSETCL, Bandra. Fax No. 022 - 26590808/26598587.

3 CE (W), MSEGCL, 3rd floor, Prakash gad, Mumbai.

4 S.E. (T&C), MSETCL, Aurangabad Fax-0240-2234220 /2346290

5 S.E (T&C), MSETCL, Pune. Fax-9520-2617532/2612342

6 Dy. CE (Testing), MSETCL, Koradi, Nagpur. Fax- 07109 - 262162

7 S.E.(T&C), MSETCL, Vashi Fax- 022-27656039 /27653463

8 S.E.(Testing), Bhusawal, Dist: Jalgaon Fax-02582-250379

9 S.E.(TCC), MSETCL, Karad. Fax.No. 02164 255118

10 CE, SLDC, GETCO, Gotri, Vadodara

11 Chief Engineer (Gen), GSECL, H.O. Baroda. Fax-0265-5512129/2344537

12 S.E. (Testing), GETCO, Baroda. Fax-0265-2351218

13 Chief Engineer (LD), MPPTCL, Jabalpur, Fax - 0761- 2664343 / 2970119.

14 E.D. (T&C), MPPTCL, Jabalpur. Fax-0761-2702710

15 ED (Engg.) MPPGCL, Jabalpur Fax- 0761-2660063

16 Chief Engineer (LD), CSPTCL, Raipur. Fax-0771 - 2574174

17 C.E. (T&C), CSPTCL, Raipur.Fax-0771-2574749

18 EE (T), CSPGCL- Fax.No. 07789-226227

19 S.E. (T&C), CSPTCL, Bhilai. Fax.No. 0788 - 2281561

20 S.E. (T&C), CSPTCL, Raipur. Fax No.0771 – 2574749 / 2574458.

21 EE, Division VIII (MRT),Elect. Dept; Goa Fax 0832-2735124.

22 Supdt.Engr., Electricity Dept., DNH, Silvasa. Fax : 0260-2642338

23 Executive Engr., Electricity Dept. DD. Fax: 0260-2250889

24 D.G.M. (O.S. ),N.T.P.C., Mumbai, Fax- 28216692

25 DGM, NTPC WR – II, Raipur, Fax: 0771 - 2544550

26 D.G.M. (EM), KSTPS, NTPC, Korba Fax 07759-233088 (Tele fax: 232440) /237462

27 DGM (EMD), VSTPS, NTPC, Vindhyachal Fax-07805-247713 /247711

28 DGM (EM-I), NTPC, SIPAT Fax-07752-246506 (Tele fax: 246691)

29 AGM (O&M), KGPP, Adityanagar, Surat Fax 0261-2861428/2861433

30 Sr. Supdt. (EM), Gandhar, NTPC Fax-02642-87402 / 87450

31 DGM (O.S.), WRLDC, Mumbai Fax-28235434

32 DGM, WRTS-I, PGCIL, Nagpur, Fax- 0712- 2631051 / 641366

33 AGM, WRTS-II, PGCIL, Baroda Fax-0265-2480952 (Tele fax: 2487542)

34 AGM, O&M, WRTS – III, PGCIL, Raipur. Fax: 0771 - 2970450

35 SME (E), TAPS-3&4,Tarapur Fax 02525-282001/282073

36 Maintenance Superintendant, TAPS –1 & 2, Tarapur.Fax- 02525-282121

37 SME(E), NPCIL , Kakrapara Fax 02626-234266

38 GM (Maint.). TORRENT Power., Ahmedabad.Fax-079-27506679

39 AGM (QAIT), TPC, Trombay. Fax –022-66687088

40 Asst. VP, Dahanu TPS Fax- 952528-222576 / 222039

41 GM (O & M), Reliance Infrastructure Limited, Mumbai Fax-30094488

42 GM (Electrical), JPL, Raigarh, Fax. No. 7767-281995, 281993.

43 AGM (OS), NSPCL, New Delhi . Fax.No.011 26717381/26717363/26717366

44 Vice President, APL, Ahmedabad 079-25557176

45 GM, RGPPL, Anjanwel, Guhagar, Ratnagiri, Fax.No. 02359 241071

46 GM, JSW Energy Ltd., Jindal Mansion, Mumbai- Fax.No.022 23526400

47 GM, CGPL, Mundra Fax.No. 02838 661188

48 VP, EPTCL, Hazira, Surat, Gujarat Fax: 0261 - 6682747

Final Report on Grid Disturbance at Akola, Akola2 and Indiabulls

(Rattan India) Sub-stations in Maharashtra on 29th March 2015

1.0 Introduction :

The disturbance at Akola and nearby substations in Maharashtra Systemon 29.03.2015 was

discussed in the 124th

, 125th

PCMs held on 21.04.2015 and 05.06.2015 respectively. In the

125th

PCM, it was decided to form a group comprising of members from MSETCL (Shri.

Tijare), WRLDC (Smt. Pushpa Sheshadri), PGCIL (Shri. Anand Dubey & Shri G. Shinde),

APL (Shri. Uday Trivedi), TATA Power (Shri. G.T. Jawale) & WRPC (Shri Satyanarayan S.

& Shri P.D.Lone) to analyze the disturbance in depth, as per preliminary report of WRLDC,

protections at many locations have mal operated/not operated resulting in a wide spread

disturbance.

Accordingly meeting of the group to analyse the disturbance was held on 16.10.2015. The list

of participants is enclosed at Annexure-I.

Based on the discussions & WRLDC preliminary report, following report is prepared.

2.0 Brief on the disturbance:

The single line diagram of the affected area and flows prior to the disturbance is enclosed at

Annexure-II.

400kV Akola2-Taptithanda-I was already in service. 400 kV Akola2 – Taptithanda – II was

open from Taptitanda end and was closed from Akola2 end for trial operation on 29.03.2015

at 13:34hrs. After charging the line at 13:34:45.335 Hrs, ‘PT fuse fail’ alarm appeared.

However the staff of Akola2 S/S didn’t pay required attention to this alarm. The DPS (both

main I & main II) at Akola2 end got blocked due to PT fuse fail. After 30 minutes i.e. at

14:03:56.610 Hrs a fault occurred on the line and was not cleared from Akola2 end due to

blocked DPS. The reason for PT fuse failure was investigated after the occurrence & it was

found that PT connection wires loose at terminal block. Thereafter at 14:04 Hrs, tripping

occurred on many lines of WR due to non-clearance of fault on 400 kV Akola2 – Taptithanda

– II. This event has led to complete blackout at Nandgaon Peth (Indiabulls), 400 kV Bus at

Akola1 and Akola2 sub-station. During this, unit 2, 3 & 5 at Indiabulls (Rattan India)

generating station (Gen: 440 MW) and Unit 8 (Gen: 110 MW) at Koradi – II generating

station tripped on standby E/F protection.

With this event and tripping of lines, power on Wardha –Parli D/C has crossed 850 MW

resulting in SPS-5 operation i.e. Wardha-Parli D/C crossing 850 MW (As 765 kV Wardha-

Aurangabad (PG) 1 & 2 were under planned outage and other line in corridor i.e. Wardha-

Akola-Aurangabad (PG) D/C and Akola2-Taptithand S/C tripped). In addition, the power

from Wardha s/s got routed through Wardha-Seoni-Khandwa-Dhule corridor and

Bhadrawati-Parli and Chandrapur-Parli corridors.

The source of the fault was located on the newly idle charged 400 kV Akola2-Taptithanda II

circuit which was charged from Akola2 at 13:34 Hrs and kept hanging from remote end. The

line was charged based on Maharashtra SLDC confirmation that they were receiving the data

for this line. The circuit was test charged for 15 minutes as per the approval of WRLDC and

it had to be tripped by 13:49 Hrs. However, the same was not followed by the Akola2 sub-

station, which is a MEGPTCL sub-station as well as Maharashtra SLDC who were having the

Data for this line. After 29 minutes of charging of this circuit, B phase to earth fault has

occurred on this line (14:03:55.090), which has to be cleared from Akola2 end distance

protection as lines was only ideal charged from Akola2 end. This fault was not cleared from

Akola2 end relay of the 400 kV Akola2-Taptithanda 2 circuit, which resulted in fault feeding

by various feeders connected with Akola2.

The above incident was serious in view that already 765 kV Wardha-Aurangabad 1 & 2 along

with 765/400 kV ICTs at Aurangabad (PG) were under shutdown. The above incident had not

resulted in any major event due to reliability measures taken for the planned outage of 765

kV lines. The Tirora generation was limited below 1800 MW and Maharashtra drawal was

restricted to 5300 MW along with WR-SR TTC reduction by 200 MW to take care of

contingencies. Further the interstate corridor of Maharashtra i.e. 400 kV Seoni- Khandwa-

Dhule D/C, 400 kV SSP-Dhule, 400 kV Vapi-Boisar, 220 kV Navsari-Nasik and all lines of

Bhilai corridor were kept in service. During the loss of the lines in the Akola –Bhusawal,

Akola2-Taptithanda 1, Akola-Wardha D/C and Koradi2-Indiabulls, the power got routed

through the 400 kV Wardha-Parli D/C and other parallel corridors and interstate corridors

mentioned above. The loading of 400 kV Wardha-Parli D/C has crossed 850 MW each which

has led associated SPS operation at 14:04 Hrs. It was further observed that no generation

backing down as designed in SPS, has occurred either at Tirora or at Mouda generating

station. The load shedding in SR has led to reverse power flow on 765 kV Solapur-Raichur

D/C and thus relieving the line loading on 400 kV lines from Eastern Maharashtra to Western

Maharashtra (load Centers) thus helping in safer operation of the Indian Grid during this

extreme contingency.

The change in various line loading can be seen in below table:

Lines Line loading in MW at

14:03

Line Loading in MW at

14:06

765 kV Seoni-Wardha 1 443 44

400 kV Seoni-Khandwa D/C 481+484 593+594

400 kV Khandawa-Dhule D/C 478+481 629+634

400 kV SSP-Dhule D/C 126+126 240+240

400 kV Dhule-Baleshwar D/C 277 + 277 450 + 450

400 kV Koradi-Deepnagar S/C 390 678

400 kV Bhadrawati-Parli S/C 415 446

400 kV Bhadrawati-Dhariwal-

Parli

401 416

400 kV Chandrapur2-Parli D/C 406+420 467+484

400 kV Chandrapur-Parli S/C 421 485

400 kV Wardha-Parli D/C 719+724 815+818

400 kV Parli(PG)-Pune GIS

D/C

314+308 409+402

400 kV Parli-Lonikhand2 D/C 410+406 516+514

3.0 Sequence of events :

Initially the fault was B-Ph fault and another fault have occurred which was Y-phase fault as seen

from the DRs and following protections operated during the fault fed. The relay indications and

Sequence of events is enclosed at Annexure-III & Annexure-IV respectively.

(i) 15:03:56:610 Hrs : 765/400kV, 1500MVA ICT tripped on initiation of 51N function of the

ABB REL670 relay on 400kV side, which is connected to neutral CT of ICT with a setting of

20% of FLC (2165 A) & time delay of 1.5 secs.

(ii) 14:03:57:684 Hrs : 400/220kV, 315MVA ICT at 400kV Akola1 tripped from LV side on Dir.

E/F.

(iii) At 14:03:58.250 Hrs, 400 kV Akola1 – Wadha – II tripped in Zone-2 at 400kV Wardha S/S

and DT received at Akola 2.

(iv) 14:04:09:058 Hrs : 400kV Nandgaon Peth –Akola1 tripped on O/V

(v) 14:04:09:064 Hrs : 400kV Wardha-Akola1 – I tripped on Zone-II DPS at Wardha end.

(vi) 14:04:09:069 Hrs : 400kV Wardha-Akola1 – II tripped on O/V at Akola1 end

(vii) 14:04:09:073 Hrs : 400kV Akola1-Augangabad(PG) – I tripped on O/V at Akola1 end.

(viii) 14:04:09:073 Hrs : 400kV Akola1- Akola2 – II tripped on Z-III(L2-L3) at Akola1 end.

(ix) 14:04:09:074 Hrs : 400kV Akola1- Akola2 – I tripped on O/V at Akola2 end.

(x) 14:04:15:694 Hrs : 400kV Akola1-Augangabad(PG) – II tripped on O/V at Akola1 end.

(xi) 14:04:15 Hrs : 400kV Akola1-Bhusawal tripped on Z-III(Y-B) at Bhusawal end.

4.0 Event Analysis:

To analyze the disturbance the data was collected and the DRs/ELs triggered/logged were co-

related. MSETCL Akola (TCC) gave a well co related presentation on the disturbance and is

enclosed at Annexure-V. The relevant DRs is enclosed at Annexure-VI.

Tripping of the lines/ICTs from remote ends was analyzed in the meeting and the

observations of the group is as follows :

The fault current recorded due to initiation of stub protection pick up of 400 kV Akola2-

Taptithanda II line at Akola2 end was around 3.448kA. The fault current contribution by

765/400kV ICT at Akola-II was seen to be around 1.635kA. The remaining contribution of

around 1.813kA was contributed by : 400kV Akola1- Akola2 D/C, 400kV Nandgaon Peth –

Akola2 D/C and 400kV Taptitanda - Akola2 – I.

The fault (Y-phase jumper flash over) on 400 kV Akola2-Taptithanda II was located at a

distance of 147Km from Akola2 end during patrolling of the line. However DRs initially

show B-phase fault. Therefore two faults occurred, initially the fault was B-phase fault and

later on second fault(Y-Ph) occurred.

(i) 400 kV Akola2- Taptithanda II line should have tripped from Akola2 end in Z-I DPS.

However the Main-I & Main –II relays were already blocked due to VT fuse failure.-

MEGPTCL have already admitted that on receipt of VT fuse failure and blocking of Min-I &

Main-II protection the S/S staff should have handtripped the line. The cause for VT fuse

failure was loose connections in both the terminal blocks of the PTs. The DRs show that the

fault was on B phase, initially. The non clearance of fault by primary protection of this line

led to clearing of fault from remote ends as follows.

(ii) Tripping of 765/400kV, 1500MVA ICT on initiation of 51N function of the ABB REL670

relay on 400kV side : Since the sensitive E/F protection was non directional with DMT, it

operated. The setting adopted is 20% of FLC (2165 A) & time delay of 1.5 secs.

(iii) Tripping of 400/220kV, 315MVA ICT at 400kV Akola1 tripped from LV side on Dir. E/F

was due to fault fed for the set time delay as per the IDMT time characteristics.

(iv) Since the 765/400kV ICT was the major in-feeding source for the fault, the other lines could

not sense the fault (due to infeed effect of approximately 2x impedance of the fault section on

400 kV Akola2- Taptithanda II was seen till the ICT tripped).

(v) Tripping of 400 kV Akola1 – Wadha – II in Zone-2 at 400kV Wardha S/S and DT received at

Akola 2 : The fault feeding path for this circuit is 400kV Wadha –Akola1(DC)– Akola2

(DCs). The line lengths of 400 kV Akola1 – Wadha is 162Km and line lengths of 400kV

Akola1-Akola2 is 30Km. The setting for Z-II 400kV Wadha –Akola1 lines is 150% of the

line length(i.e.243Km). The setting for Z-II 400kV Akola2 –Akola1 lines is 150% of the line

length (i.e.45Km). Therefore 400kV Akola1-Akola2 could not sense the fault in Z-II,

However as per settings it was within Z-II reach of 400kV Wadha –Akola1. The 400kV

Wadha –Akola1 lines could not trip ahead of ICTs was due to the fact that there was major

contribution of fault current from ICTs, resulting in high in-feed effect for 400kV Wadha –

Akola1 lines before tripping of ICTs. However the 400kV Wadha –Akola1 lines tripped in Z-

II after tripping of ICTs(i.e. reduction in in-feed fault current). This suggests that the fault was

between 8Km to 66Km from Akola2end.

The DT in Z-II on 400 kV Akola1 – Wadha – II was inadvertently wired up and hence

tripping of this line at Akola1 on DT receipt occurred, which has now been disabled.

(vi) Tripping of 400kV Wardha-Akola1 – I in Zone-II DPS at Wardha end –same as described at

Sr.(iv)..

(vii) Tripping of 400kV Nandgaon Peth –Akola1 on O/V : After loss of major fault feeding lines,

O/V might have occurred.

(viii) 14:04:09:069 Hrs : 400kV Wardha-Akola1 – II tripped on O/V at Akola1 end : After loss of

major fault feeding lines, O/V might have occurred.

(ix) 14:04:09:073 Hrs : 400kV Akola1-Augangabad(PG) – I tripped on O/V at Akola1 end.: After

loss of major fault feeding lines, O/V might have occurred.

(x) 14:04:09:073 Hrs : 400kV Akola1- Akola2 – II tripped on Z-III(L2-L3) at Akola1 end : : The

fault feeding path for this circuit is 400kV Akola1– Akola2 (DCs). The line length of 400 kV

Akola1 – Akola2 is 30Km and the fault was between 8-66Kms. The setting for Z-II 400kV

400kV Akola1– Akola2 (DCs) lines is 150% of the line length(i.e.45Km).. Therefore 400kV

Akola1-Akola2 could not sense the fault in Z-II since the fault was 8-66Km from Akola2 end

and due to DC the faulty section impedance seen by the relays was 2xfault impedance after

the tripping of 400kV Wadha –Akola1 DCs. Therefore one of the 400kV Akola1- Akola2

lines tripped in Zone-III due to racing around and thereafter the other circuit tripped on O/V.

(xi) 14:04:09:074 Hrs : 400kV Akola1- Akola2 – I tripped on O/V at Akola2 end : After loss of

major fault feeding lines, O/V might have occurred.

(xii) 14:04:15:694 Hrs : 400kV Akola1-Augangabad(PG) – II tripped on O/V at Akola1 end :

After loss of major fault feeding lines, O/V might have occurred.

(xiii) 14:04:15 Hrs : 400kV Akola1-Bhusawal tripped on Z-III(Y-B) at Bhusawal end : : The

fault feeding path for this circuit was 400kV Bhusawal - Akola1(SC) - Akola2 (DC). The line

length of 400 kV Bhusawal- Akola1 is 180Km and line length of 400kV Akola1-Akola2 is

30Km. The setting for Z-III 400kV Bhusawal- Akola1 line is 100% of Bhusawal- Akola1 and

100% of Akola1-Nanedgaon peth (longest line from remote bus) which is 288Km and

therefore tripping of this line resulted after loss of major contributing in feeds.

(xiv) After 14:04:15 Hrs: 400kV Koradi-Nanedgaon peth : 400kV Koradi-Nanedgaon peth line

length(i.e.158Km). The setting for Z-III 400kV Koradi-Nanedgaon peth line is 100% of

Koradi-Nanedgaon peth(158Km) and 100% of Akola1-Nanedgaon peth (longest line from

remote bus) which is 262Km and therefore tripping of this line resulted after loss of major

contributing in feeds.

(xv) Once the primary protection had failed to isolate the fault, protections at remote end

operated and the reaches sensed by these relays were telescopic or reverse telescopic.

This might seem surprising at the first look, but were by and large in order.

5.0 Change in the voltage during the event can be seen in below figures:

5.1 Load/Generation Loss: Generation of Around 550 MW was lost with tripping of Units

of Koradi-8 and Indiabulls 2, 3 & 5. There was no direct load loss, due to tripping of above

ICT’s or lines. However due to tripping of Akola 315MVA ICT, 220 kV network at Akola

was over loaded (Paras unit-3 &4 were out prior to occurrence). Hence, planned load

shedding from A to G groups and distress load shedding was carried out in Buldhana and

Akola district. Approximate 80 MW Load was affected due this. Load shedding was

withdrawn at 15.50 Hrs after charging of Akola ICT.

5.2 Frequency Change: Due to loss of generation frequency dropped by 0.0564 Hz due to

loss of generation as shown in below figure.

5.3 Restoration:

Sl.No Line/ICT Restoration time

1 400 kV Koradi2-Indiabulls 14.39

2 400 kV Akola–Wardha 1 15.03

3 765/400 kV 1500 MVA ICT at Akola2 15.06

4 400 kV Akola2 –Taptithanda 1 15.19

5 400 kV Akola– Aurangabad(PG) 1 15.30

6 400KV Akola–Bhusawal 15.36

7 400KV Akola–Wardha 2 15.47

8 400/220KV, 315MVA ICT at Akola 15.49

9 400 kV Akola– Aurangabad(PG) 2 16.04

10 400 kV Indiabulls-Akola 16.15

11 400 kV Akola2- Akola 1 16.47

12 400 kV Akola2- Akola 2 16.48

13 400 kV Indiabulls-Akola2 1 17.45

14 400 kV Indiabulls-Akola2 2 17.46

15 Indiabulls Unit 2 20:40

16 Indiabulls Unit 3 30-03-15 02:11

17 Indiabulls Unit 5 30-03-15 06:22

18 Koradi 8 30-03-15 03:18

6.0 Conclusions & Recommendations :

Human Factor at 765/400 kV Akola2 Sub-station

After analyzing the disturbance, it is observed that one the major factor which led to the

event was the human error at Akola2 Sub-station. The event logger has clearly shown the

VT fuse failure alarm immediately after the ideal charging of 400 kV Akola2-Taptithanda

2 circuit. The VT connections were loose as admitted by M/s MEGPTCL, the voltages

displayed on the control panel & the alarm itself would have been taken seriously and the

line should have been immediately hand tripped rather than trying to search out for the

cause. Moreover this was idle charged and could have been tripped easily.

The Group recommends that the well known protection principle of tripping a line once

both DPSs are blocked and the cause for blocking the DPS could not be fixed within

shortest possible time, should be strictly followed. Otherwise operation of protections

from remote ends would disrupt larger areas and their operation can be bit surprising at

times. This issue may be discussed in OCC and suitable policy adopted.

Other protection issues :

1. The commissioning should have been done with proper testing and checking of all the

wiring and logic prior to charging of the lines at 765/400 kV Akola2 Sub-station.

Proper testing to be done for all the connection prior to charging of new lines. All

utility must do a proper check of all the connections and verify the connections using

injection kit.

2. The system near about Akola (Akola, Wardha, Koradi, Chandrapur, Khaparkheda &

Aurangabad) is complex and have many complexities as regards to Main/Backup

protection settings. A coordinated setting of Main/backup relays at the complex of

Akola is required to be arrived at, considering the In-feed/Out-feed effect by

simulating faults at various locations. Hence the traditional/Ramkrishna Committee

recommendations would be required to deviate.

PGCIL, Maharashtra STU, M/s MEGPTCL and indiabulls representatives in co

ordination with WRLDC may sit together and decide proper settings.

3. Utility intending to connect new elements to either STU network/CTU network

should get all the settings verified from STU/CTU and STU/CTU shall make an effort

to revise & co-ordinate the relay settings in the nearby system.

4. WRLDC/SLDC instruction to be strictly adhered while carrying out any work in the

Interconnected Grid. Any online relay work if need to be performed should be first

informed to respective SLDC or RLDC for permission.

Overvoltage grading of Akola and nearby stations is required to be done.

WRLDC instruction :

The line was charged based on the confirmation of details from Maharashtra SLDC that

they were receiving the online data of this line at their SCADA system. In view of critical

system conditions, WRLDC have permitted test charging of the line for 15mins only.

After 15 minutes of the line charging, the line should have been switched off.

Unfortunately the fault occurred on the line just after 15mins.Therefore in case of any

issue this should have also been reported to WRLDC as the data of this line was not

available at WRLDC end. Also WRLDC may review its policy, as to why test charging of

lines for such a small durations are permitted. Policy may be discussed in OCC.

Non-Availability Data of Maharashtra System at WRLDC SCADA

The most of the Maharashtra system real-time data from Maharashtra system was not

available at WRLDC, which makes system monitoring in Maharashtra at WRLDC very

difficult. WRLDC has to rely completely on Maharashtra SLDC.

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9 .10

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15

1617

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HCL

Typewritten text

Annex-I

SLD of Akola2 & nearby System

400 kV Bhusaval 400 kV Akola I 400 kV Nandgaon Peth 400 kV Koradi

400 kV Wardha (PG)

-

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

400 kV

400 kV

400 kV

400 kV

Time: 13:34:45:335

765 kV

220 kV

Annex-2

SLD of Akola2 & nearby System


400 kV Wardha (PG)

-

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

400 kV

400 kV

400 kV

400 kV

Time: 13:34:45:335 998 MW

←357 MW

←357 MW

←194 MW

←194 MW

←666 MW

765 kV

Relay Indication and Tripping Time Annexure III

Element Tripping Time

at End 1 Indication

Tripping Time

at End 2 Indication

765/400 kV 1500 MVA ICT at Akola-II 14:03:56.621 Intertrip command 14:03:56.621

ICT tripping initiated from 51NS function of

the ABB make relay REL670, which is

connected with Neutral CT of ICT, Setting is

20% of FLC (2165 A), DT time delay of 1.5

Second. The fault current was @ 1600 Amp.

400 kV Akola 2-Taptitanda I 14:04:09.108 O/V Stage 1 Operated, DT Send 14:04:09.128 Tripped on DT Receipt from Remote end

400 kV Akola 2-Taptitanda II -

Remained charged and feeding fault

to system due to non-operation of

protection. Hand Tripped

- Was not charged from this end

400 kV Akola 2-Akola I 14:04:09.116 O/V Stage 1 Operated 14:04:09.116 DT Receipt

400 kV Akola 2-Akola II - No tripping 14:04:09:745 Zone 3 Protection Operated

400 kV Akola 2-Indiabull I 14:04:09.082 Stage 1 O/V Operated 14:04:09.116

O/V Stage 1 start at 14:03:56.687 O/V Stage

1 Trip , Vr=289 kV , Vy=189 kV, Vb=184 kV.

DT Send , DT received

400 kV Akola 2-Indiabull II 14:04:09.078 DT receipt from Remote end 14:04:09.116

O/V Stage 1 start at 14:03:56.688. O/V

Stage 1 Trip , Vr=280. kV , Vy=190 kV,

Vb=183 kV, DT Send , DT received

400 kV Akola –Bhusawal Pending Pending 14:04 Zone 3 tripping

400 kV Akola-Aurangabad (PG) I

14:04:09.128 O/V Stage 1 Trip, DT send, DT

Received 14:04:09.127 DT Receipt

400 kV Akola-Aurangabad (PG) II 14:04:15.746 O/V Stage 1 Trip, Vr=252 kV , Vy=251 14:04:15.746 DT Receipt

kV, Vb=253 kV DT send, DT Received

400 kV Akola-Indiabulls 14:04:09.099 DT receipt from Remote end 14:04:09.058

O/V Stage 1 start at 14:03:56.689. O/V

Stage 1 Trip , Vr=280. kV , Vy=191 kV,

Vb=183 kV, DT Send , DT received

400 kV Akola-Wardha I 14:04:09.128

O/V stage 1 protection operated at

Wardha end due to open end. Vr=278

kV , Vy=193 kV, Vb=184 kV, DT Send ,

DT received

14:03:58.250 B Phase to E/F , Zone 3 Start 14:03:57.608,

Zone 2 start at 14:03:57.250, Zone 2 trip

400 kV Akola–Wardha II 14:03:58:329 Vr=253 kV , Vy=176 kV, Vb=200 kV DT

Received 14:03:58.250

B Phase to E/F , Zone 3 Start 14:03:57.559,

Zone 2 start at 14:03:57.250, Zone 2 trip

400/220 kV, 315 MVA ICT at Akola 14:03:57.739 Intertrip 14:03:57.739 Direction O/C protection at 220 kV end

400 kV Indiabulls- Koradi-II 14:04:09.058 O/V start at 14:03:56.687, DT

Received 14:03:59.050 Tripped on Zone 3

Koradi Unit 1 14:04 Tripped on Standby Earth fault

protection of GT - -

Indiabulls Unit 2,3,5 14:04

Generator tripped on Zigzag E/F

protection due to unbalanced current

followed by Tripping of turbine on

over frequency

- -

Event Sequence Annexure IV

Time Sub-station Indication

13:34:45.335 Akola2 400 kV Akola2-Taptithanda 2 circuit was ideal charged from Akola

13:34:47.394 Akola2 VT Fuse Fail Alarm for the 400 kv Akola2-Taptithanda 2

14:03:55.000 Indiabulls Power Swing Detected at India bulls by 400 kV Akola2-Indiabulls 1 & 2 and Akola-Indiabulls circuit at Indiabulls end.

14:03:55.093 Akola2 Power swing sensed by 765 kV Akola2-Koradi3 1 & 2 circuit.

14:03:55.100 Akola2 Stub Protection starts for 400 kV Akola2-Taptithanda 2

14:03:55.107 Akola2 Delayed E/F protection start, Standby E/F protection start for 765/400 kV ICT 1

14:03:55.249 Akola Directional E/F protection picked up for 400/220 kV ICT

14:03:56.621 Akola2 765/400 kV ICT 1 tripped on 51 N Protection (Sensitive Earth Fault Protection) from 400 kV and intertrip command to 765 kV side

14:03:56.677 Akola2 Over voltage stage 1 start for 400 kV Akola2-Indiabulls 1 & 2 , 400 kV Akola2-Akola 2, 400 kV Akola-Taptithanda 1

14:03:56.687 Indiabulls 400 kV Akola2-Indiabulls 1 & 2, Akola-Indiabulls and Koradi2-Indiabulls lines O/V stage 1 got picked up.

14:03:57.250 Wardha B Phase to E/F, Zone 2 start and trip for 400 kV Wardha-Akola 1 & 2

14:03:57.559 Wardha B Phase to E/F , Zone 3 Start for 400 kV Wardha-Akola 2

14:03:57.592 Akola 400 kV Wardha-Akola1 & 2 picked up fault in reverse Zone

14:03:57.608 Wardha B Phase to E/F , Zone 3 Start for 400 kV Wardha-Akola 1

14:03:57.739 Akola 400/220 kV ICT tripped on Directional O/C protection

14:03:57.913 Akola Overvoltage Stage 1 picked up for 400 kV Akola-Akola2 1 circuit

14:03:58.287 Koradi2 Zone 3 start on 400 kV Indiabulls-Koradi2

14:03:58.316 Akola2 Over voltage stage 1 start for 400 kV Akola2-Akola 1

14:03:58.329 Akola DT receipt for 400 kV Wardha-Akola2

14:03:58.710 Akola Overvoltage Stage 1 picked up for 400 kV Akola-Akola2 2 circuit.

14:03:59.050 Koradi2 Zone 3 trip on 400 kV Indiabulls-Koradi2

14:04:00.105 Akola2 Broken Conductor alarm for 400 kV Akola2-Taptithanda 2 circuit.

14:04:00.408 Akola Power swing detected by 400 kV Akola-Bhusawal circuit

14:04:01.727 Wardha SPS for 400 kV Wardha-Parli D/C operated.

14:04:06.563 Akola2 Over voltage stage 1 reset for 400 kV Akola2-Akola 1 & 2 and 400 kV Akola2-Taptithanda 1

14:04:07.099 Akola2 Over voltage stage 1 started again for 400 kV Akola2-Akola 2.

14:04:07.108 Akola2 Over voltage stage 1 started again for 400 kV Akola2-Akola 1

14:04:07.182 Akola2 Over voltage stage 1 started again for 400 kV Akola2-Taptithanda

14:04:07.526 Akola2 Over voltage stage 1 reset again for 400 kV Akola2-Taptithanda

14:04:07.684 Akola2 Over voltage stage 1 reset again for 400 kV Akola2-Akola 1

14:04:07.707 Akola2 Over voltage stage 1 reset again for 400 kV Akola2-Akola 2

14:04:09.000 Akola 400 kV Akola-Wardha 1 tripped on Stage O/V 1 operated.

14:04:09.058 Indiabulls O/V stage 1 operated for 400 kV Akola-Indiabulls circuit and it tripped and DT was send to remote end. 400 kV Indiabulls-Koradi 2 circuit tripped from DT from Remote end.

14:04:09.078 Akola2 DT received for 400 kV Akola2-Indiabulls 1 from remote end

14:04:09.082 Akola2 Over Voltage stage 1 operated for Akola2-Indiabulls2 2

14:04:09.099 Akola2 Over voltage stage 1 started again for 400 kV Akola2-Akola 2

14:04:09.108 Akola2 Over voltage stage 1 started again for 400 kV Akola2-Taptithanda and Master Trip issued

14:04:09.116 Akola2 Over voltage stage 1 started again for 400 kV Akola2-Akola 1 and Master Trip issued.

14:04:09.116 Indiabulls Akola2-Indiabulls 1 & 2 circuit tripped on O/V stage 1 operation and DT was send to remote end.

14:04:09.127 Aurangabad(PG) 400 kV Akola-Aurangabad(PG) 1 tripped on DT receipt

14:04:09.128 Akola 400 kV Akola-Aurangabad (PG) I O/V stage 1 operated

14:04:09.128 Akola 400 kV Akola-Akola2 1 tripped on Stage O/V 1 operated.

14:04:09.745 Akola 400 kV Akol-Akola2 2 tripped on Zone 3 Protection operation.

14:04:15.746 Aurangabad(PG) 400 kV Akola-Aurangabad(PG) 2 tripped on DT receipt





11/2/2015

1

“Towering Excellence”

WELCOME

Review of Occurrence at 765/400 kV substation Akola II

[MEGPTCL] On 29th March 2015


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda MSETCL)

400 kV

400 kV

400 kV

400 kV

765 kV


400 kV Wardha (PG)

-

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

400 kV

400 kV

400 kV

400 kV

Line charged with other end open with a permission for 10 min

Time: 13:34:45:335 998 MW

←357 MW

←357 MW

←194 MW

←194 MW

←666 MW

765 kV


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:03:55:090

Time: 00:00:00:000

Fault on AKL II – AUG CKT I not cleared at AKL II Fault current = 3.448 kA

Fault not cleared as VT fuse failure since 13:34:47.394

400 kV

400 kV

400 kV

400 kV

765 kV

HCL

Typewritten text

Annex-5

11/2/2015

2


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV

Aurangabad (Taptitanda)

Time: 14:03:56:621

Time: 00:00:01:536 Tripped on Sensitive E/F

Fault current fed = 1.635 kA

If = 3.448 kA

Elapsed Time

B PH

• Fault current in B ph of Akola II – Taptitanda Ckt. II – 3448 A.

• Out of 3448A, 1635A was fed by 765/400kV ICT. Remaining 1800 A was shared by

Akola II – Nandgaon I & II, Akola-I - Akola II Ckt I & II and Akola – Taptitanda - I lines.

Due to sharing, above lines fed very low magnitude of current which was not sufficient to operate/pickup distance relay. During this time none of the remote end relays picked up / operated.


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:03:57:684

Tripped on LV Dir. E/F Ir = 0.49 A, Iy = 0.36 A, Ib = 0.26 A, In = 0.62 A

Time: 00:00:02:594


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:03:58:250

Tripped on Zone II & III, Y Ph, 209 km, IR = 1000 A, IY = 1380 A, IB = 830 A, IN = 220 A, Unbal

Time: 00:00:03:160

11/2/2015

3

• High current in Y ph at Wardha is not in commensuration with the fault on B ph of Taptitanda-II line.

• This is not a genuine fault.

• This might have been resulted due to tripping of ICTs.


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:03:58:329

Tripped on DT receive

Time: 00:00:03:239


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:09:058

Tripped on O/V

Time: 00:00:13:968


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:09:069


Time: 00:00:13:979

Tripped on O/V

Tripped on Zone III

11/2/2015

4

• At this time another fault developed on the 400 kV Akola II – Taptitanda Ckt. II.

• M/s MEGPTCL reported that Y ph subconductor of the line got loosened and touched the tower member at loc. 327 at 147 km.

• Two sources were feeding this fault.

• At Koradi, the Koradi – Nandgaon Peth line, which was feeding this fault tripped in Zone III, Y ph.


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:09:073

Tripped on O/V

Time: 00:00:13:983


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

*

Time: 14:04:09:073


Time: 00:00:13:983


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:09:074

Time: 00:00:13:984

Tripped on O/V, DT receive / send

Tripped on O/V, DT receive / send

11/2/2015

5


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:09:078

Time: 00:00:13:988

Tripped on O/V


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:09:094

Time: 00:00:14:004

Tripped on O/V


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

• -

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:09:099

Time: 00:00:14:004

Tripped on DT


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:09:107

Time: 00:00:14:017

Tripped on O/V

Tripped on DT recieve

Tripped on O/V

11/2/2015

6


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:09:158

Time: 00:00:14:017

Tripped on DT


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:09:745

Time: 00:00:14:655

Tripped on Zone III, Y Ph & B Ph

• The second time fault on the 400 kV Akola II – Taptitanda Ckt. II was now being fed by Bhusaval – Akola I – Akola II Ckt II.

• The Akola I – Akola II Ckt. II tripped in Zone III, Y & B ph.

• The subconductor might then have swung and came near B ph conductor, hence B ph detected.


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:09:750

Tripped on Zone III, Y Ph & B Ph

Time: 00:00:14:810

11/2/2015

7

• The second time fault on the 400 kV Akola II – Taptitanda Ckt. II was now being fed by Bhusaval – Akola I – Akola II Ckt II.

• The Akola I – Akola II Ckt. II tripped in Zone III, Y & B ph.

• The subconductor might then have swung and came near B ph conductor, hence B ph detected.


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:15:694

Tripped on O/V

Time: 00:00:20:604

Tripped on DT


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Time: 14:04:09:745*

Time: 00:00:14:655

Hand Tripped


400 kV Wardha (PG)

400 kV Akola II

400 kV

Aurangabad (PG)

765 kV Koradi

765 kV Akola II

400 kV Aurangabad

(Taptitanda)

Hand Tripped

11/2/2015

8

THANK YOU

Disturbance Recorder Files Annexure VI

1. Indiabulls Sub-station

Figure : Akola2-Indiabulls 1

Trigger29-03-2015

14:04:09.059

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_IL1/A

0

10

20

30

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_IL2/A

0

25

50

75

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_IL3/A

0

25

50

75

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_IN/A

0

5

10

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_UL1/kV

0

100

200

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_UL2/kV

0

50

100

150

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_UL3/kV

0

50

100

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_UN/kV

0

50

100

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

MUTUAL_COMP/A

0

50

100

150

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

DT_SENDDT_RECD_CH1

86B_OPTDM2_RLY_DC_FAI

BB_OPTD86A_OPTD

CB_BPH_OPENCB_YPH_OPENCB_RPH_OPEN

TOV1-STARTTOV1-TRIP

ZM05-STARTZM04-STARTZM03-STARTZM02-STARTZM01-START

TRIP2 L3TRIP2 L2TRIP2 L1

TRIP2_TRIPTRIP1 L3TRIP1 L2TRIP1 L1

TRIP1_TRIP

Figure : Akola2-Indiabulls 2

Trigger29-03-2015

14:04:09.106

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_IL1/A

0

50

100

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_IL2/A

0

25

50

75

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_IL3/A

0

25

50

75

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_IN/A

0

50

100

150

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_UL1/kV

0

100

200

300

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_UL2/kV

0

100

200

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_UL3/kV

0

50

100

150

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_UN/kV

0

100

200

300

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

FF_BLKUFUSE_FAIL

DT_SENDDT_RECD_CH1

86B_OPTDM2_RLY_DC_FAI

BB_OPTD86A_OPTD

CB_BPH_OPENCB_YPH_OPENCB_RPH_OPENCAR_REC_CH2

CARR_SW_OUT_PTOV1-START

TOV1-TRIPZM04-START

ZM04-TRIPZM03-START

ZM03-TRIPZM02-START

ZM02-TRIPZM01-START

ZM01-TRIPTRIP2 L3TRIP2 L2TRIP2 L1


TRIP1_TRIP

Figure : Indiabulls-Akola line

Trigger29-03-2015

14:04:09.058

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_IL1/A

0

25

50

75

100

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_IL2/A

0

50

100

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_IL3/A

0

50

100

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_IN/A

0

25

50

75

100

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_UL1/kV

0

50

100

150

200

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_UL2/kV

0

50

100

150

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_UL3/kV

0

50

100

150

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

LINE_A_UN/kV

0

50

100

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5

DT_RECD_CH186B_OPTD

M2_RLY_DC_FAIBB_OPTD

86A_OPTDCB_BPH_OPENCB_YPH_OPENCB_RPH_OPENCAR_REC_CH1

TOV1-STARTTOV1-TRIP

ZM04-STARTZM03-STARTZM02-STARTZM01-START



TRIP1_TRIP

Figure : Indiabulls-Koradi2 line

Trigger29-03-2015

14:04:09.069

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_IL1/A

0

25

50

75

100

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_IL2/A

0

25

50

75

100

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_IL3/A

0

25

50

75

100

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_IN/A

0

25

50

75

100

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_UL1/kV

0

100

200

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_UL2/kV

0

100

200

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_UL3/kV

0

100

200

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

LINE_A_UN/kV

0

100

200

t/s-0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0

FF_BLKUFF_BLKZ

FUSE_FAILDTR_CH-II

DT_SEND_CH186B_OPTD86A_OPTD

CB_BPH_OPENCB_YPH_OPENCB_RPH_OPEN

AR01-INHBITTOV1-START

TOV1-TRIP

2. Akola Sub-station

Figure : 400/220 kV Akola ICT

Figure : Akola-Aurangabad(PG) 1

Figure : Akola-Aurangabad(PG) 2

Trigger29-03-2015

14:04:15.732

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

iL1/A

0

50

100

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

iL2/A

0

50

100

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

iL3/A

0

50

100

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

uL1/kV

0

100

200

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

uL2/kV

0

100

200

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

uL3/kV

0

100

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

DTRecCH2DTRecCH1

MainBBoptdMainCBBOpMainCBYOpMainCBROp

Main2TrpDTSend

TCB B OpenTCB Y OpenTCB R Open

Uph-e>(>) TRIPUph-e> PickupRelay TRIP L3Relay TRIP L2Relay TRIP L1

EF Trip>Trig.Wave.Cap.

Figure : Akola-Wardha 1

Figure : Akola-Wardha 2

Trigger29-03-2015

14:03:57.593

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

K1:iL1/kA

0.00

0.25

0.50

0.75

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

K1:iL2/kA

0.0

0.5

1.0

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

K1:iL3/kA

0.00

0.25

0.50

0.75

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

K1:uL1/kV

0

100

200

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

K1:uL2/kV

0

100

200

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

K1:uL3/kV

0

50

100

150

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

K2:iEp/kA

0.0

0.5

1.0

t/s-0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

DTRECEIVE2DTRECEIVE1DT SENDCH2DT SENDCH1

MainCBBOpMainCBYOpMainCBROpMainARsuc

Uph-e>(>) TRIPRelay TRIP

EF TripEF Pickup

Dis. Pickup Z5Dis. Pickup Z4Dis. Pickup Z3Dis. Pickup Z2

Dis. reverseDis. forward

Dis.Pickup EDis.Pickup L3Dis.Pickup L2Dis.Pickup L1

Dis.T.SEND>Trig.Wave.Cap.

3. Aurangabad (PG) Sub-Station

Figure : Akola-Aurangabad (PG) 1 at the start of event at Akola2 Sub-station

Trigger29-03-2015

14:03:59.053

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VA/kV

50

100

150

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VB/kV

75

100

125

150

175

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VC/kV

50

100

150

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VN/kV

5

10

15

20

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IA/A

0

100

200

300

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IB/A

0

100

200

300

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IC/A

0

100

200

300

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

UnusedAny Start

ZCOM TRIPR16-DT SEND CH-2R15-DT SEND CH-1

DIST Sig. SendIN>1 Trip

SOTF/TOR TripZONE-4 TRIPZONE-3 TRIPZONE-2 TRIPZONE-1 TRIP

LBB OPTD-M/T BAYBB PROTN OPTD

I>4 TripPower Swing

V>2 TripV>1 Trip

GRP-A 86A OPTDDT RECEIVED CH-2DT RECEIVED CH-1CARR.RECEIV CH-2R10-Y-PH TCB TC1

R18-CAR.SEND CH2MAIN-2 RLY OPTD

R13-GENERAL TRIPTIE CB B-PH OPENTIE CB Y-PH OPENTIE CB R-PH OPENMAIN CB B-PH OPNMAIN CB Y-PH OPNMAIN CB R-PH OPN

Figure : Akola-Aurangabad(PG) 1 tripping on DT receipt from remote end

Trigger29-03-2015

14:04:09.127

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VA/kV

50

100

150

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VB/kV

100

200

300

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VC/kV

50

100

150

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VN/kV

0

100

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IA/A

0

100

200

300

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IB/A

0

100

200

300

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IC/A

0

100

200

300

400

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IN/A

0

50

100

150

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

UnusedAny Start

ZCOM TRIPR16-DT SEND CH-2R15-DT SEND CH-1

ZONE-4 TRIPZONE-3 TRIPZONE-2 TRIPZONE-1 TRIPPower Swing

V>2 TripV>1 Trip

GRP-A 86A OPTDDT RECEIVED CH-2DT RECEIVED CH-1CARR.RECEIV CH-2TIE CB B-PH OPENTIE CB Y-PH OPENTIE CB R-PH OPENMAIN CB B-PH OPNMAIN CB Y-PH OPNMAIN CB R-PH OPN

Figure : Akola-Aurangabad(PG) 2 tripping on DT receipt from remote end

Trigger29-03-2015

14:04:15.746

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VA/kV

50

100

150

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VB/kV

0

50

100

150

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VC/kV

0

100

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VN/kV

0

50

100

150

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IA/A

0

100

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IB/A

0

100

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IC/A

0

100

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IN/A

10

20

30

40

50

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

R16-DT SEND CH-2R15-DT SEND CH-1

SOTF/TOR TripZONE-4 TRIPZONE-3 TRIPZONE-2 TRIPZONE-1 TRIP

I>4 TripPower Swing

V>2 TripV>1 Trip

GRP-A 86A OPTDDT RECEIVED CH-2DT RECEIVED CH-1CARR.RECEIV CH-2R10-Y-PH TCB TC1

R18-CAR.SEND CH2MAIN-2 RLY OPTD

R13-GENERAL TRIPTIE CB B-PH OPENTIE CB Y-PH OPENTIE CB R-PH OPENMAIN CB B-PH OPNMAIN CB Y-PH OPNMAIN CB R-PH OPN

4. Wardha Sub-Station

Figure : Wardha-Akola 1 tripping on Zone 2

Trigger29-03-2015

14:03:57.608

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VA/kV

50

100

150

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VB/kV

100

150

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VC/kV

50

100

150

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VN/kV

0

50

100

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IA/kA

0.00

0.25

0.50

0.75

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IB/kA

0.0

0.5

1.0

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IC/kA

0.00

0.25

0.50

0.75

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IN/A

0

100

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

DIST Trip BZ3Z2

TIE CB B OPENTIE CB Y OPENTIE CB R OPEN

Any TripAny Trip

MAIN CB B-OPENMAIN CB Y-OPEN

MAIN CB R- OPEN

Figure : Wardha-Akola 2 tripping on Zone 2

Trigger29-03-2015

14:03:57.559

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VA/kV

0

100

200

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VB/kV

0

50

100

150

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VC/kV

0

50

100

150

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

VN/kV

0

50

100

150

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IA/kA

0.00

0.25

0.50

0.75

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IB/kA

0.0

0.5

1.0

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IC/kA

0.00

0.25

0.50

0.75

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

IN/A

0

200

400

t/s-0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

Z3Z2

TIE CB B OPENTIE CB Y OPENTIE CB R OPEN

DIST FwdAny Trip

MAIN CB B-OPENMAIN CB Y-OPEN

MAIN CB R- OPEN

5. Akola2 Sub-station

Figure : Akola2-Taptithanda line

Trigger29-03-2015

14:04:09.206

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_A_IL1/mA

-0

200

400

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_A_IL2/mA

-0

200

400

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_A_IL3/mA

-0

200

400

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_A_IN/mA

-0

200

400

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_VT_UL1/V

0

25

50

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_VT_UL2/V

0

25

50

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_VT_UL3/V

0

25

50

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_VT_ULN/V

0

25

50

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

FUSE_FAIL

TOV1-START

TOV1-TRIP

TUV1-START

TUV1-TRIP

Figure: Akola2-Akola 1 line

Trigger29-03-2015

14:04:07.108

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

LINE_A_IL1/A

0

50

100

150

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

LINE_A_IL2/kA

0.00

0.25

0.50

0.75

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

LINE_A_IL3/kA

0.00

0.25

0.50

0.75

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

LINE_A_IN/A

0

20

40

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

LINE_VT_UL1/kV

0

100

200

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

LINE_VT_UL2/kV

0

100

200

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

LINE_VT_UL3/kV

0

100

200

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

LINE_VT_ULN/kV

0

100

200

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

FUSE_FAILDTS FEEDBACK

AR01-STARTTIE_3PH_PRP

MAIN_3PH_PRPAR01-INHBITTOV1-START

TOV1-TRIPTUV1-START

TUV1-TRIP

Figure : Akola2-Indiabulls 1 line

Trigger29-03-2015

14:04:09.082

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75

LINE_A_IL1/A

0

50

100

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75

LINE_A_IL2/A

0

50

100

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75

LINE_A_IL3/A

0

50

100

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75

LINE_A_IN/A

0

50

100

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75

LINE_VT_UL1/kV

0

100

200

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75

LINE_VT_UL2/kV

0

100

200

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75

LINE_VT_UL3/kV

0

100

200

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75

LINE_VT_ULN/kV

0

100

200

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75

FUSE_FAILTIE_3PH_PRP

MAIN_3PH_PRPDTS FEEDBACK

AR01-INHBITTOV1-START

TOV1-TRIPTUV1-START

TUV1-TRIPZM05-STARTZM04-STARTZM03-STARTZM02-STARTZM01-START



TRIP1_TRIP

Figure : Akola2-Indiabulls 2 line

Trigger29-03-2015

14:04:09.173

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_A_IL1/A

0

50

100

150

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_A_IL2/A

0

50

100

150

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_A_IL3/A

0

50

100

150

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_A_IN/A

0

50

100

150

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_VT_UL1/kV

0

100

200

300

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_VT_UL2/kV

0

100

200

300

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_VT_UL3/kV

0

100

200

300

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

LINE_VT_ULN/kV

0

100

200

300

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75

FUSE_FAILDTS FEEDBACK

TIE_3PH_PRPMAIN_3PH_PRP

TOV1-STARTTOV1-TRIP

TUV1-STARTTUV1-TRIP

Figure : Akola2-Taptithanda 2

Trigger29-03-2015

14:03:55.100

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50

VA/kV

100

150

200

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50

VB/kV

50

100

150

200

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50

VC/kV

100

150

200

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50

VN/kV

100

150

200

250

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50

IA/A

100

150

200

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50

IB/A

50

100

150

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50

IC/kA

0

1

2

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50

IN/kA

0

1

2

t/s-0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.50

Z4Z3Z2Z1

DIST Trip CDIST Trip BDIST Trip A

Any TripAny Start

6. Koradi2 Station

Figure: Indiabulls-Koradi2 Line which tripped on Zone 3 from Koradi2 Station

Trigger29-03-2015

14:00:52.385

t/s-0.4 -0.3 -0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

VA/kV

50

100

150

200

t/s-0.4 -0.3 -0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

VB/kV

100

150

t/s-0.4 -0.3 -0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

VC/kV

50

100

150

t/s-0.4 -0.3 -0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

VN/kV

0

50

100

t/s-0.4 -0.3 -0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

IA/kA

0.00

0.25

0.50

0.75

1.00

t/s-0.4 -0.3 -0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

IB/kA

0.0

0.5

1.0

1.5

t/s-0.4 -0.3 -0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

IC/kA

0.00

0.25

0.50

0.75

1.00

t/s-0.4 -0.3 -0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

IN/A

0

200

400

t/s-0.4 -0.3 -0.2 -0.1 -0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

PREP 3PH TRIP TPREP 3PH TRIP M

CB B-PH OPENCB Y-PH OPENCB R-PH OPEN

Force 3P TripT3T2T1Z3

DIST Trip CDIST Trip BDIST Trip A

Any TripAny Start

PMU Plots

en scr f.i}s urc:rmc=r chl' ~(>f ftqttwrpc.gov.in/pcm/akola_final_report_wrpc.pdf1.0...

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