POWER GRID CORPORATION OF INDIA LTD

SOUTHERN REGIONAL LOAD DESPATCH CENTRE

in

139TH SREB MEETING

19TH DECEMBER 2005

HYDERABAD

GRID EVENTS AND ISSUES

ISSUES

• 7.1.1 400 KV KAIGA – GUTTUR

• 7.2.1 400 KV MADURAI – TRIVENDRUM D/C LINE

• 8.0 TALCHER – KOLAR HVDC

• 9.1 400 KV KAIGA – NARENDRA D/C LINE

• 10.0 EVACUATION SCHEMES FOR NEW CENTRAL

SECTOR GENERATING STATIONS

• 11.1 UNREQUISITIONED POWER OF NTPC

STATIONS

• 12.2 KALPAKKAM – EVACUATION SCHEME

ISSUES (Continued …)

• 13.1 TALCHER – KOLAR INTERTRIP SCHEME

• 14.1 ALTERNATE PATH FOR EVACUATION OF

TALCHER STAGE 2 POWER

• 15.1 INTER REGIONAL TRANSMISSION LINKS

BETWEEN ER/WR AND SR

• 16.1.i HIGH VOLTAGE CONDITIONS

• 16.1.ii KAIGA – GUTTUR TRIPPING DETAILS

• 16.1.iii HIGH FREQUENCY CONDITIONS

• 16.1.iv STOA – CHIKKODI – KOLHAPUR LINE

ISSUES (Continued …)

• 5 FREQUENCY LINKED PENALTY/INCENTIVE

SCHEME FOR OVER/UNDER DRAWALS OF

SHARES

• 8 REGIONAL POWER COMMITTEE

• SCHEDULE DRAWAL GRAPHS

• INTER REGIONAL EXCHANGES

• SUMMARY OF UI

400 KV KAIGA – GUTTUR• TRIPPING DETAILS

• DIFFERENT OPTIONS

– DURING TRIPPING TYPICAL FLOWS

– ALTERNATIVE 1

– ALTERNATIVE 2

– ALTERNATIVE 3

– RADIALISATION OF CHIKODI, BELGAUM AND

NARENDRA LOAD

– LOAD FLOW STUDY RESULTS FOR PROVIDING

AUTOMATIC INTER-TRIP SCHEMES AT KAIGA

DETAILS OF TRIPPING OF 400KV KAIGA-GUTTUR CIRCUIT II ON LINE FAULT

Sl. No

Date of Event

Trip Time Normalisation Date & Time

Description of Events Remarks

1 05/08/05 09:31HRS 05-08-05 16:46HRS

Tripped on Distance Protection at Guttur

end.2 10/08/05 10:02HRS 12-08-05

17:42HRSTripped on Distance Protection at Guttur

end.

De-capping of suspension insulators.

3 13-08-05 07:14HRS 13-08-05 08:14HRS

Tripped without any relay flagged.

4 13-08-05 08:15HRS 13-08-05 19:32HRS

Tripped on CB pole discrepancy at Guttur

end5 13-08-05 19:33HRS 16-08-05

12:01HRSTripped on Distance Protection at Guttur

end.

De-capping of suspension insulators.

6 16-08-05 12:39HRS 26-08-05 18:54HRS

Guttur end Breaker tripped on LBB.

7 30-08-05 20:41HRS 30-08-05 23:34HRS

Tripped on distance protection at Kaiga

end.8 06/09/05 14:45HRS 06-09-05

16:46HRSTripped at Kaiga

without any protection relay.

9 15-10-05 18:25HRS 16-10-05 19:55HRS

Tripped on Distance Protection at Guttur

end.

De-capping of suspension insulators.

10 17-10-05 20:55HRS 18-10-05 18:20HRS

Tripped on Distance Protection.

11 21-10-05 16:27HRS 23-10-05 18:30HRS

Tripped on Distance Protection.

12 24-10-05 18:32HRS 25-10-05 18:20HRS

Tripped on Distance Protection at Guttur

end.

De-capping of suspension insulators.

13 05/11/05 20:12HRS 16-11-05 16:16HRS

Tripped on Distance Protection at Guttur

end.

De-capping of suspension insulators.

PROPOSED ALTERNATIVES FOR AVERTING TRIPPING OF GENERATORS AT KAIGA & KALI COMLEX DURING TRIPPING OF 400KV KAIGA-GUTTUR FEEDER II

48(-13)

(76) 24

(-21)28

TALAGUPPA

24(76)

(OPEN) 307

163SHARAVATHI

57

(85) 115

192(304)

GUTTUR

57

GADAG

63

90 90

387(475)

101 101

(97)5252(97)

(41)11

NAGJHERI

KODASALLI

CHIKKODI

BELGAUM

NADENDRA

MAHALINGPURA

LINGAPUR

HUBLI

PONDA

150

500

130

KAIGA

KADRA

KARWAR

400

KOLHAPUR (MSEB)

28(-21)

25

1

101

ALL FIGURES IN MW

SUB-STATION

GENERATORS

220KV

400KV

AMBEWADI

4444

Note: The Figures in brackets shows the flows after tripping of 400KV Kaiga-Guttur ckt II

TYPICAL MW FLOWS:- AROUND KAIGA AND KALI COMPLEX

ALTERNATIVE – I

249 (0)

TALAGUPPA

OPEN

181

109

SHARAVATHI

OPEN

(103)148

179(293)

GUTTUR

OPEN

GADAG

43

90 90

109

395(520)

47 47

2 2

115(24)

22

NAGJHERI

KODASALLI

CHIKKODI

BELGAUM

NADENDRA

MAHALINGPURA

LINGAPUR

HUBLI

PONDA

150

500

130

KAIGA

KADRA

KARWAR

400

KOLHAPUR (MSEB)

OPEN

37

11

105

ALL FIGURES IN MW

SUB-STATION

GENERATORS

220KV

400KV

AMBEWADI

4444

Note: The Figures in brackets shows the flows after tripping of 400KV Kaiga-Guttur Feeder – II.

TYPICAL FLOWS :- AFTER RADIALISATION OF CHIKODI, BELGAUM & NARENDRA

ALTERNATIVE – 2TYPICAL FLOWS :- SPLIT BUS OPERATION AT KAIGA

KAIGA 400KV BUS - 2

20100

60

60

400

245

SECTION - 1

ALL FIGURES IN MW

GENERATOR

220KV

400KV

KAIGA 400KV BUS - 1

KAIGA220KV

GUTTUR 220KV BUS

GUTTUR 400KV BUS

~

155

~

SECTION - 2

KADRA KODASALLY

NARENDRA400KV BUS

KAIGA 2 x 220 MW

ICT

BUS 1

KAIGA220KV

BUS 2

Continue …

ALTERNATIVE – 2 (Continued …)TYPICAL FLOWS :- SPLIT BUS OPERATION AT KAIGA

245

6

191

60

SHARAVATHI

52

100

155

GUTTUR

52

GADAG

15

88 88

60

430

98 98

70 70

20

24

NAGJHERI

KODASALLI

CHIKKODI

BELGAUM

NADENDRA

MAHALINGPURA

LINGAPUR

TALAGUPPA

HUBLI

PONDA

150

500

130

KAIGA

KADRA

KARWAR

400

KOLHAPUR (MSEB)

6

38

16

103

ALL FIGURES IN MW

SUB-STATION

GENERATORS

220KV

400KV

AMBEWADI

4343

ALTERNATIVE – 3

TYPICAL FLOWS :- AFTER TRIPPING OF 400KV KAIGA-GUTTUR CIRCUIT II

(10)21

TALAGUPPA

76(54)

OPEN(OPEN)

217SHARAVATHI

54(64)

(OPEN) 85

304(275)

GUTTUR

54(64)

GADAG

15

90 90

(54)76

475(521)

(112)101101(112)

(131)9797(131)

13(OPEN)

(125)41

NAGJHERI

KODASALLI

CHIKKODI

BELGAUM

NADENDRA

MAHALINGPURA

LINGAPUR

HUBLI

PONDA

150

500

130

KAIGA

KADRA

KARWAR

400

KOLHAPUR (MSEB)

21(10)

60

34

113

ALL FIGURES IN MW

SUB-STATION

GENERATORS

220KV

400KV

AMBEWADI

4444

Note: The Figures in brackets shows the flows after tripping of 220kV Kaiga-Kaidra & Kaiga-Kodasalli.

LINE FLOWS:-

NAME OF THE LINES Base Case

Base Case & Tripping of

400KV Kaiga-Guttur ckt-II

Case 1 : Radialisation of

Chikodi, Belgaum & Narendra

Case 1 & Tripping of 400KV Kaiga-Guttur

ckt-II400KV KAIGA-GUTTUR 307 OPEN 249 OPEN220KV KAIGA-GUTTUR 192 304 179 293400KV KAIGA-NARENDRA I 24 76 109 108400KV KAIGA-NARENDRA II 24 76 109 108220KV HUBLI-NARENDRA I 28 -21 OPEN OPEN220KV HUBLI-NARENDRA II 28 -21 OPEN OPEN220KV NARENDRA-AMBEWADI I -57 -54 OPEN OPEN220KV NARENDRA-AMBEWADI II -57 -54 OPEN OPEN220KV NAGJHERI-AMBEWADI I 101 101 47 51220KV NAGJHERI-AMBEWADI II 101 101 47 51220KV KADRA-KAIGA 115 85 148 103220KV KODASALLY-KAIGA 48 -13 115 24220KV NAGJHERI-HUBLI I TO IV 387 475 395 520

220KV VOLTAGES:-

NAME OF THE S/S Base Case

Base Case & Tripping of

400KV Kaiga-Guttur ckt-II

Case 1 : Radialisation of

Chikodi, Belgaum & Narendra

Case 1 & Tripping of 400KV Kaiga-Guttur

ckt-IIBELGAUM 216 215 210 198NARENDRA 220 219 214 203CHIKODI 212 211 206 193

LOAD ASSUMED:- MW/MVARCHIKODI 101/42BELGAUM 78/48

GENERATION ASSUMED:-

RAICHUR 1400MWSHARAVATHI 900MWNAGJHERI 500MW

KADRA 130MWKODASALLY 150MW

RADIALISATION OF CHIKODI, BELGAUM AND NARENDRA LOAD

LOAD FLOW STUDY RESULTS FOR PROVIDING AUTOMATIC INTER-TRIP SCHEMES AT KAIGAGenerations assumed for studiesStation Generation in MWRaichur 1400MWSharavathy 900MWNagjheri 500MWKadra 130MWKodasahalli 150MWKaiga 440MW

Line Flows in MWName of the Line Base case Case 1 Case II400KV Kaiga Guttur II 307 OPEN OPEN220KV Kaiga Guttur I 192 304 275400KV Kaiga Narendra I 24 76 54400KV Kaiga Narendra II 24 76 54220KV Hubli-Narendra I 28 -21 -10220KV Hubli-Narendra II 28 -21 -10220KV Ambewadi-Narendra I 57 54 64220KV Ambewadi-Narendra II 57 54 64220KV Kadra-Kaiga 115 85 OPEN220KV Kodasahalli -Kaiga 48 -13 OPEN220KV Nagjheri- Ambewadi I &II 202 202 225220KV Nagjheri- Hubli I toIV 387 475 521220KV Nagjheri- Kodasahalli I&II -104 -194 -262220KV Kadra-Kodasahalli 11 41 125

Case I : Opening of 400KV Kaiga guttur 400KV line II

Case II : Case I and Opening of 220KV Kadra-Kaiga and Kodasahalli -Kaiga feeders at Kaiga.

TRIVANDRUM

COCHIN

THRISSUR

MADURAI

UDUMALPET

ARASUR NLY-EXP

NEYVELI

BAHOOR

PUGALUR

TRICHY

SALEM

HOSUR

MYSORE

SP-BUDUR

MELKOTTAIYUR

ALMATHI

CHITOOR

KOLAR

S’HALLI

NLMNG

HOODY

JAYAMKONDAM

KARAIKUDI

MULTI-CIRCUIT

TOWER ON 220 KV

EDAMON-KAYATHAR CORRIDOR

HASSAN

KOZHIKODE

400 KV MAURAI – TRIVENDRUMD/C LINE

ADVANTAGES OF MADURAI-TRIVANDRUM LINE

• ALTERNATE SUPPLY PATH TO TRIVANDRUM

AREA

• INCREASED STABILITY OF S.KERALA SYSTEM

• DECREASED LOSSES

• IMPROVED TRANSFER MARGIN –

FACILITATING BETTER MERIT ORDER

OPERATION AND ECONOMY

Cont..

THE ISSUES OF CONCERN

• HIGH VOLTAGE AT TRIVANDRUM

– TRIPPING OF ICT ON V/F AT NIGHT

– RISK OF TRIPPING OF LINE

• CONTINUED HIGH LOADING ON 220 KV

EDAMON-KAYATHAR PREVENTING

FURTHER DECREASE IN GENERATION

IN KSEB SYSTEM

Cont..

THE MAXIMUM AND MINIMUM VOLTAGES OF EACH DAY DURING NOV 2005AT TRIVENDRUM 400 KV BUS

380

385

390

395

400

405

410

415

420

425

430

435

440

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

DAYS

VO

LT

IN

KV

ADVANTAGES OF COMMISSIONING 400 KV KAIGA NARENDRA

D/C LINE

PONDA

(Goa)

KOLHAPUR

(MAHARASHTRA)

CHIKKODI

KARNATAKA

BELGAUM

NARENDRA 220

KADRA

KAIGA

AMBEWADI

XELDEM(GOA)

NAGJHARI

KODASALLI

HUBLI

GUTTUR

M.L.PURA

NOT TO SCALE

DISTANCES EXAGERATED FOR CONVENIENCE

MAPUSA

ADVANTAGES OF COMMISSIONING 400 KV KAIGA-NARENDRA D/C LINE

• PROVIDES ALTERNATE PATH FOR EVACUATION OF KAIGA GENERATION IN CASE OF CONTINGENCY

• LINE IS ON DIFFERENT ROUTE FROM THAT OF KAIGA-GUTTUR

• ENHANCED REDUNDANCY AND RELIABILITY

FREQUENCY DURATION CURVE OCT-05, OCT-04 & SEP-05

48.50

49.00

49.50

50.00

50.50

51.00

1 1117 2233 3349 4465 5581 6697 7813 8929 10045 11161 12277 13393 14509 15625 16741 17857 18973 20089 21205

% OF TIME --->

FR

EQ

UE

NC

Y I

N H

Z -

-->

0 10 20 30 40 50 60 70 80 90 100

OCT-05

SEP-05

OCT-04

<49 <49.5 49-50.5 >50.0 >50.5 Avg Freq

Oct-05 0.00 0.03 97.47 96.04 2.53 50.22

Oct-04 0.00 1.94 99.37 22.43 0.63 49.89

Sep-05

0.00 0.12 94.38 94.22 5.62 50.25

In HZ

Continue …

FREQUENCY DURATION CURVE NOV-05, NOV-04 & OCT-05

48.50

49.00

49.50

50.00

50.50

51.00

1 1081 2161 3241 4321 5401 6481 7561 8641 9721 10801 11881 12961 14041 15121 16201 17281 18361 19441 20521

% OF TIME --->

FR

EQ

UE

NC

Y I

N H

Z -

-->

0 10 20 30 40 50 60 70 80 90 100

NOV-05

OCT-05

NOV-04

<49 <49.5 49-50.5 >50.0 >50.5 Avg Freq

Nov-05

0.12 1.58 98.24 78.60 1.64 50.11

Nov-04

0.33 8.04 99.63 17.76 0.04 49.80

Oct-05 0.00 0.03 97.47 96.04 2.53 50.22

In HZ

Continue …

To Arrest High Frequency:

• Reservoir based hydro backing/closing

• Liquid Fuel Stations backing/closing down

• IR export

• Thermal Stations backing down/Closing down

• Hydro backing down – even on overflowing

stations

Continue …

To Arrest High Frequency: (Con .. )

• With frequency > 50.5 Hz

– back down even at overflowing hydro

stations

• No sudden injection in the grid at freq > 50.2 Hz.

Continue …

KADAMPARAI GENERATION/PUMP ENERGY FROM JAN - 2003

 

2003 2004 2005

GENERATOR MODE

PUMP MODE

GENERATOR MODE

PUMP MODE

GENERATOR MODE

PUMP MODE

JAN 39 38 44 58 0 0

FEB 39 46 21 21 0 0

MAR 32 51 6 18 0 0

APR 35 40 26 35 0 3

MAY 37 43 41 48 30 46

JUN 29 45 55 35 45 51

JUL 47 49 50 49 79 62

AUG 54 55 55 41 50 25

SEP 36 48 30 25 41 15

OCT 26 15 0 0 47 45

NOV 23 24 0 0 64 59

DEC 49 53 0 0    

TOTAL 446 507 328 330 356 306

REALISATION OF OPEN ACCESS CHARGES FOR SRLDC (Figures are in Rs. Lakhs)

SRLDC (Nodal)

from other RLDCs

1 May-04 3 1.86 1.41 2.13 0.15 5.55

2 Jun-04 1 0.24 3.48 0.18 0.05 3.95

3 Jul-04 0 0 0.99 0 0 0.99

4 Aug-04 0 0 3.48 0 0 3.48

5 Sep-04 0 0 6.12 0 0 6.12

6 Oct-04 0 0 14.64 0 0 14.64

7 Nov-04 0 0 15.51 0 0 15.51

8 Dec-04 0 0 11.52 0 0 11.52

9 Jan-05 3 1.02 6.48 1.49 0.20 9.19

10 Feb-05 8 3.54 7.56 4.05 0.40 15.55

11 Mar-05 6 3.18 0 3.84 0.25 7.27

21 9.84 71.19 11.69 1.05 93.77

1 Apr-05 2 1.90 1.2 0 0.10 3.20

2 May-05 10 1.59 2.76 0 0.45 4.80

3 Jun-05 1 0.80 5.01 0 0.05 5.86

4 Jul-05 1 0.05 3.75 0 0.05 3.85

5 Aug-05 0 0 10.86 0 0 10.86

6 Sep-05 0 0 15.1 0 0 15.10

7 Oct-05 0 0 21.8 0 0 21.80

14 4.34 60.48 0 0.65 65.47

35 14.18 131.67 11.69 1.70 159.24

No.of applications processed (as Nodal

RLDC)

Month & Year

Sl.no

GRAND TOTAL

Total for the year 2004-05

Total for the year 2005-06

Year 2005-06

Year 2004-05

Handling Charges as Nodal RLDC

Processing Charges

Total

Scheduling /System Operation Charges

STEPS TAKEN TO CONTAIN OVER VOLTAGE• TRANSFORMER TAP CHANGES

– MANY ICT TAPS WERE CHANGED ON 400/220 ICT’s

• GT TAP CHANGES

• GENERATORS ON SYNCH CONDENSOR MODE

• NETWORK MANIPULATION

– UPTO 40 LINES KEPT OUT TO CONTROL HV DURING LEAN SEASON

– EVEN DURING PEAK, SRISAILAM LINES ARE KEPT OPEN TO CONTROL HIGH VOLTAGE

– TAKING OUT THE LINE AND CONVERTING LINE REACTOR TO BUS REACTOR

• UTILISATION OF HYBRID AC/DC NETWORK

DIVERSION OF TALCHER STAGE 2 POWER THROUGH GAJUWAKA

KHAMMAM

VIJAYAWADAN’SAGAR

GAZUWAKA (POWERGRID)HYDERABAD

RAICHUR

GOOTY

HOODY

SALEM

UDUMALPET

TRICHUR

MADURAI

TRICHY

MADRAS

NEYVELI

GUTTUR

KAIGA

RSTPP

BHADRAVATI

BANGALORE

MUNIRABAD

P

P

P

P

P

P

P

P

PP

P

P

N

KOLAR

TALCHER

JEYPORE

HOSUR

P

SSLMM

MMDP

THIRUVANANTHAPURAM

NELLORE

NELAMANGALA

KURNOOL

KALPAKKA

SIMHADRI NTPC

HIRIYUR

TALGUPPA

SIRSI

CUDDAPAH1000 MW HVDC BACK TO BACK LINK

2000 MW HVDC BIPOLE

500 KV HVDC LINE

400 KV LINE POWERGRID

400 KV LINE APTRANSCO

400 KV LINE KPTCL

400 KV LINE OPERATED AT 220 KV

THERMAL GENERATING STATION

NEYVELI TPS – 1 (EXP) EXP

400KV SUB-STATION

NARENDRA

MAHABOOB NAGAR

Name of the 400 kv line

1 Khammam-Kalpakka I 364 63 YES 632 Khammam-Kalpakka II 364 63 YES 633 Vijayawada-Nellore I 341 50 YES 504 Vijayawada-Nellore II 341 50 YES 505 Vijayawada-Gazuwaka I 317 63 YES 636 Vijayawada-Gazuwaka II 315 50 YES 637 Vijayawada-Gazuwaka III 315 63 YES 638 N'sagar-Gooty 308 50 YES 509 Gooty-Hoody 305 63 YES 5010 Talaguppa-Neelamangala I 348 50 YES 5011 Talaguppa-Neelamangala II 348 50 YES 5012 Jeypore-Gazuwaka I 220 NIL 8013 Jeypore-Gazuwaka II 220 NIL 8014 Ramagundam-Hyderabad II 195 NIL 5015 Ramagundam-Khammam 189 NIL 5016 Ramagundam-Chandrapur-I 178 NIL 5017 Ramagundam-Chandrapur-II 178 NIL 5018 Hiriyur-Nelamangala I 145 NIL 5019 Hiriyur-Nelamangala II 145 NIL 5020 Nelamangala-Bangalore 73 NIL 63

LIST OF 400K V LINES WHERE LINE REACTOR CAN BE CONVERTED INTO BUS

REACTOR IN SR

S.NO.SENDING END LINE REACTOR

CAPACITY(MAVR)

LENGTH (KMS)

RECEIVING END LINE REACTOR

CAPACITY(MAVR)YES / NO

SYNCHRONOUS CONDENSOR OPERATION: IN OPERATION

S. NoName of the Generator

Unit NoInstalled capacity

(In MW)Remarks

1 N'Sagar 2 100 Running

2 N'Sagar 3 100 Running

3 N'Sagar 4 100 Running

4 N'Sagar 5 100 Running

5 N'Sagar 6 100 Running

6 N'Sagar 7 100 Running

7 SriSailam LBPH 1 150 Tested

8 SriSailam LBPH 2 150 Tested

9 SriSailam LBPH 3 150 Tested

10 SriSailam LBPH 4 150 Running

11 SriSailam LBPH 5 150 Running

12 Iddukki 1 130 Running

13 Iddukki 2 130 Running

14 Iddukki 3 130 Running Cont..

NO UNITS X MW TOTAL MW

1 SHARAVATHI 10x103.5 1035 S V.PELTON

2 JOG 4x18+4x12 120 S V.PELTON

3 VARAHI 2x115 230 S V.PELTON

4 KUTTIADI 3x25 75 S PELTON

5 KUTTIADI EXTENTION 1x50 50 PELTON

6 PALLIVASAL 3x7.5+3x4 37.5 S PELTON

7 SENGULAM 4x12 48 R PELTON

8 SABARIGIRI 6x50 300 S PELTON

9 IDUKKI 3x130+3x130 780 S PELTON

10 PEPPARA 3 3 S PELTON

11 PYKARA 3x6.65+2x11+2x14 70 S H.PELTON12 MOYAR 3x12 36 S V.PELTON13 KUNDAH - I 3x20 60 S V.PELTON14 KUNDAH - II 5x35 175 S V.PELTON15 KUNDAH - III 3x60 180 S V.PELTON16 SURULIYAR 1x35 35 S PELTON17 KODAYAR 1x60 60 S V.PELTON

TAMIL NADU

KERALA

KARNATAKA

SL.NO.TYPE OF SCHEME

TYPE OF TURBINE

POWER STATIONINSTALLED CAPACITY

LIST OF GENERATORS WITH PELTON TURBINE

Cont..

IDUKKI UNIT 1 RUNNING IN CONDENSER MODE ON 27-MAR-03

-60

-40

-20

0

20

40

60

80

100

120

140

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 00

TIME IN HR ---->

MW

/MV

AR

->

MW

MVAR

3 QUADRANT OPERATION

Cont..

IDUKKI UNIT 2 RUNNING IN CONDENSER MODE ON 14-MAR-03

-60

-40

-20

0

20

40

60

80

100

120

140

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 00

TIME IN HR ---->

MW

/MV

AR

->

MW

MVAR

Cont..

GENERATORS ON SYNCH CONDENSOR MODE: ADVANTAGES

• IMPROVED SHORT CIRCUIT LEVELS

• CAN BE CONVERTED TO GENERATOR MODE IN SHORT NOTICE

• EXCELLENT REACTIVE SOURCE

• REDUCED LOSSES

• CONTROL VOLTAGE FLUCTUATIONS

UNREQUISITIONED POWER OF NTPC STATIONS

• RSTPS UNIT 7– SEP 05 1.12 MU ( 05 Transactions)– OCT 05 7.65 MU (15 Transactions) – NOV 05 4.37 MU (11 Transactions)

• TALCHER STAGE 2– NOV 05 6.06 MU (08 Transactions)

Cont..

Month Export Import Wheeling Export Import WheelingApril'05 1 2 1 10 44 May'05 9 7 3 80 63 5June'05 19 1 3 128 38 6July'05 2 0 4 20 0 22

August'05 92 0 0 194 0 7September'05 103 0 0 356 0 32

October'05 135 0 0 564November '05 139 0 0 382

Total 500 10 11 1734.13 144.47 71.59

Number of Transactions. ENERGY SCHEDULED(REA) IN Mus

DETAILS OF STOA TRANSACTIONS

Cont..

REALISATION OF OPEN ACCESS CHARGES FOR SRLDC (Figures are in Rs. Lakhs)

SRLDC (Nodal)

from other RLDCs

1 May-04 3 1.86 1.41 2.13 0.15 5.55

2 Jun-04 1 0.24 3.48 0.18 0.05 3.95

3 Jul-04 0 0 0.99 0 0 0.99

4 Aug-04 0 0 3.48 0 0 3.48

5 Sep-04 0 0 6.12 0 0 6.12

6 Oct-04 0 0 14.64 0 0 14.64

7 Nov-04 0 0 15.51 0 0 15.51

8 Dec-04 0 0 11.52 0 0 11.52

9 Jan-05 3 1.02 6.48 1.49 0.20 9.19

10 Feb-05 8 3.54 7.56 4.05 0.40 15.55

11 Mar-05 6 3.18 0 3.84 0.25 7.27

21 9.84 71.19 11.69 1.05 93.77

1 Apr-05 2 1.90 1.2 0 0.10 3.20

2 May-05 10 1.59 2.76 0 0.45 4.80

3 Jun-05 1 0.80 5.01 0 0.05 5.86

4 Jul-05 1 0.05 3.75 0 0.05 3.85

5 Aug-05 0 0 10.86 0 0 10.86

6 Sep-05 0 0 15.1 0 0 15.10

7 Oct-05 0 0 21.8 0 0 21.80

14 4.34 60.48 0 0.65 65.47

35 14.18 131.67 11.69 1.70 159.24

No.of applications processed (as Nodal

RLDC)

Month & Year

Sl.no

GRAND TOTAL

Total for the year 2004-05

Total for the year 2005-06

Year 2005-06

Year 2004-05

Handling Charges as Nodal RLDC

Processing Charges

Total

Scheduling /System Operation Charges

EVACUATION SCHEMES FOR NEW CENTRAL SECTOR GENERATING STATIONS

• KOODANKULAM APP

• NEYVELI TS-II EXPANSION

• KAIGA STAGE -II

KUDANKULAM TRANSMISSION KUDANKULAM TRANSMISSION SYSTEM( 2000MW)SYSTEM( 2000MW)

LINES : 601+ 350 = 950 Km. ESTIMATED COST = 1710 CRORESLINES : 601+ 350 = 950 Km. ESTIMATED COST = 1710 CRORES

KUDANKULAM-TIRUNELVELI KUDANKULAM-TIRUNELVELI 2 X 400 KV D/C LINES WITH 2 X 400 KV D/C LINES WITH QUAD (108 & 83 Km.)QUAD (108 & 83 Km.)

TIRUNELVELI-UDUMALPET TIRUNELVELI-UDUMALPET D/C LINE WITH TWIN D/C LINE WITH TWIN MOOSE (300Km)MOOSE (300Km) LILO OF BOTH CIRCUITS OF LILO OF BOTH CIRCUITS OF MADURAI-TRIVANDRUM LINE MADURAI-TRIVANDRUM LINE AT TIRUNELVELI ( 2 X 55 Km)AT TIRUNELVELI ( 2 X 55 Km) EDAMON-EDAMON-MUVATTUPUZHA MUVATTUPUZHA D/C LINE QUAD (150Km)D/C LINE QUAD (150Km) TIRUNELVELI-EDAMON 400KV D/C LINE (110Km).TIRUNELVELI-EDAMON 400KV D/C LINE (110Km).

MUVATTUPUZHA-TRICHUR 400KV D/C LINE WITH MUVATTUPUZHA-TRICHUR 400KV D/C LINE WITH QUAD QUAD CONDUCTORS (90Km)CONDUCTORS (90Km)

T N

KARNATAKA

KERALA

Contd..

KUDANKULAM TRANSMISSION KUDANKULAM TRANSMISSION SYSTEM( 2000MW)SYSTEM( 2000MW)

SUB-STATIONSSUB-STATIONS

NEW 400/220KV SUBSTATIONS AT TIRUNELVELI, NEW 400/220KV SUBSTATIONS AT TIRUNELVELI, MUVATTUPUZHAMUVATTUPUZHA

AUGMENTATION OF TRANSFORMATION CAPACITY BY ONE AUGMENTATION OF TRANSFORMATION CAPACITY BY ONE TRANSFORMER EACH AT UDUMALPET & TRIVANDRUM S/STRANSFORMER EACH AT UDUMALPET & TRIVANDRUM S/S

SUPPLEMENTARY TRANSMISSION SYSTEMSUPPLEMENTARY TRANSMISSION SYSTEM

LILO OF ONE CIRCUIT OF 400KV MADURAI-TRICHY LILO OF ONE CIRCUIT OF 400KV MADURAI-TRICHY AT KARAIKUDI ( 60 Km) ALONG WITH SUBSTATION ATAT KARAIKUDI ( 60 Km) ALONG WITH SUBSTATION AT KARAIKUDI (TAMILNADU)KARAIKUDI (TAMILNADU)

LILO OF ONE CIRCUIT OF TALAGUPPA-NELAMANGALA LILO OF ONE CIRCUIT OF TALAGUPPA-NELAMANGALA 400KV LINE AT HASSAN ( 80 KM) ALONG WITH SUBSTATION AT400KV LINE AT HASSAN ( 80 KM) ALONG WITH SUBSTATION AT HASSAN.(KARNATAKA)HASSAN.(KARNATAKA)

KAIGA 3 & 4 TRANSMISSION SYSTEMKAIGA 3 & 4 TRANSMISSION SYSTEM

LINES : 413 KmsLINES : 413 Kms

MYSORE-KOZHIKODE D/C LINEMYSORE-KOZHIKODE D/C LINE

LILO OF KOLAR-SRIPERUMBADUR LILO OF KOLAR-SRIPERUMBADUR AT MELAKOTTAIYUR (40KM)AT MELAKOTTAIYUR (40KM)

NARENDRA-DAVANGERE D/C LINE NARENDRA-DAVANGERE D/C LINE

SUB-STATION : 2 Nos. NewSUB-STATION : 2 Nos. New

NEW 400/220KV SUBSTATION ATNEW 400/220KV SUBSTATION AT KOZHIKODE & MELAKOTTAIYURKOZHIKODE & MELAKOTTAIYUR

22NDND 315MVA TRANSFORMER 315MVA TRANSFORMER AT AT HIRIYUR S/S. HIRIYUR S/S. BAY EXTENSION AT NARENDRA, DAVANGERE (KPTCL) & BAY EXTENSION AT NARENDRA, DAVANGERE (KPTCL) &

HIRIYUR.HIRIYUR.

COST ESTIMATE : 512 CRORESCOST ESTIMATE : 512 CRORES

KERALA

NLC-TS-II EXPANSION TRANSMISSION SYSTEMNLC-TS-II EXPANSION TRANSMISSION SYSTEM

LINES : 467 Km.LINES : 467 Km.

2 NOS. 400KV S/C LINES FROM 2 NOS. 400KV S/C LINES FROM NEYVELI-TS-II (EXISTING) NEYVELI-TS-II (EXISTING) TO NLC TS-II (EXPAN) (8 KM).TO NLC TS-II (EXPAN) (8 KM).

NEYVELI-PUGALUR D/C LINENEYVELI-PUGALUR D/C LINE

PUGALUR-MADURAI D/C LINEPUGALUR-MADURAI D/C LINE

UDUMALPET-ARASUR D/C LINEUDUMALPET-ARASUR D/C LINE

LILO OF NEYVELI-SRIPERUMBU-LILO OF NEYVELI-SRIPERUMBU- DUR LINE AT PONDY.DUR LINE AT PONDY.

SUB-STATIONSUB-STATION

NEW 400/220KV SUBSTATIONS AT PUGALUR, ARASUR & NEW 400/220KV SUBSTATIONS AT PUGALUR, ARASUR & PONDICHERRY.PONDICHERRY.

COST ESTIMATE : 721 CRORESCOST ESTIMATE : 721 CRORES

T N

KERALA

KARNATAKA

INTER REGIONAL EXCHANGES

265

221

150 138

0

50

100

150

200

250

300

350

SR RATE WR RATE SR RATE ER RATE

RA

TE

(P

AIS

A/K

WH

) -

>

IMPORT BY SR FROM WR (668 MU)

IMPORT BY SR FROM ER (805 MU)

INTER REGIONAL EXCHANGES

146 139

286 295

0

50

100

150

200

250

300

350

SR RATE WR RATE SR RATE ER RATE

RA

TE

(P

AIS

A/K

WH

) -

>

EXPORT BY SR TO WR (610 MU)

EXPORT BY SR TO ER (311 MU)

INTER-REGIONAL EXCHANGES DETAILS UPTO 151 WKS (Till 20.11.05)

WR ER

Net Energy Transaction

57.5 MU

IMPORT BY SR

493.9MU

IMPORT BY SR

Amount Due to

SR Constituents

Rs. 79.7 Cr. Rs. 24.5 Cr.*

Amount Credited TO SR

Constituents

Rs. 76.2 Cr. Rs. 24.5 Cr.

*from 06.09.04 (when ER exchanges computed @ respective frequencies)

UI IN SR (FROM 01/01/03 TO 04/12/05)

• TOTAL UI TURNOVER :- 10141 MU

• TOTAL UI AMOUNT DISBURSED:- 1933 CR

• AVG WEEKLY TRANSACTION:- 66 MU

• AVG WEEKLY UI AMOUNT DISBURSED:- 13 CR

Contd..

AP KAR KER TN PONDY

Total UI exported(-) /

Imported(+) in MUs

-4688 4734 679 1702 -199

Total amount paid in Crores

Rs.-899 862 117 448 -36

Average rate of UI in paise/unit 192 182 173 263 183

SUMMARY OF UI – 153WKS(FROM 01/JAN/03 TO 04/DEC/05)

Contd..

OD UD AND UI RATES OF CONSTITUENTS

182 179

234

200184

149

379

185

0

50

100

150

200

250

300

350

400

AP KAR KER TN

RA

TE

(P

AIS

E/U

NIT

)

OVER DRAWAL (PURCHASE) UNDER DRAWAL (SOLD)

226MU

4914MU

4766MU

31MU

1315MU

2281MU

579MU

636MU

IMPLEMENTED SCHEME TO ENSURE GRID STABILITY

a) BOTH POLES WERE HEALTHY AND ONE POLE GOES OUT

• INSTANT TRIPPING OF UNIT #6, (ONE OF THE FOUR STAGE-II UNITS) IF EX BUS GENERATION IS MORE THAN 1700MW

b) BOTH POLES WERE HEALTHY AND BOTH POLES GO OUT

• IF EX BUS GENERATION IS MORE THAN 1100 MW

– UNITS #5 & #6 TRIPPED INSTANTANEOUSLY– UNIT #4 TRIPPED AFTER 250 m sec

• IF EX BUS GENERATION IS MORE THAN 550 MW

UNIT # 5 TRIPPED INSTANTANEOUSLY UNIT # 4 TRIPPED AFTER 250 m sec UNIT # 6 TRIPPED AFTER 500 m sec

NOTE: STAGGERED TRIPPING IS ADOPTED TO ALLOW THE POWER

SUMMATED SIGNAL RESETTINGContinue ……

Inter Trip Scheme

Continue ……

CONDITIONS BEING CONSIDERED FOR TRIPPING OF 220 KV LINES ON CONDITIONS BEING CONSIDERED FOR TRIPPING OF 220 KV LINES ON

TRIPPING OF TALCHER-KOLAR HVDC POLE(S)TRIPPING OF TALCHER-KOLAR HVDC POLE(S)

MONOPOLAR OPERATION:If the pole power one second prior to trip was more than 400 MW, we extend the inter-trip.

BIPOLAR OPERATION:

(2A) If both poles were carrying power in excess of 200 MW and both poles trip within a time span of 2 sec, we extend inter-trip.(2B) If both poles were carrying power in excess of 800 MW and any one of the poles trips, we extend inter-trip irrespective of power compensation by the surviving pole.(2C) If each pole was carrying power in the range of 400 MW to 800MW and one pole trips, no trip is extended if after a delay of 2 sec the power of surviving pole is more than 600 MW.

COMMISSIONED ON 18.04.2003

PRESENT KOLAR INTER TRIP LOGIC

Continue ……

HIGH SPEED INTER-TRIP SCHEME AT KOLAR

GOOTY

HOODY

SALEM

TRICHUR

MADURAI

TRICHY

SPBDR

NLC II

CUDDAPAH

PONDICHERY

SOMANHALLI KOLAR

HOSUR

NLC -1 EXP.

UDUMALPET

BAHOOR

KURNOOLSOMYAZULA PALLI

TO TALCHER

Continue ……

PRESENT INTER-TRIP POINTS

1) Chinakampally 4) Hosur

2) Kolar ICT 5)Sriperumbudur

3) Hoody 6) Salem

Continue ……

SUGGESTED SCHEME: TRIP SIGNAL 1

• Trip Signal 1 would be initiated under any one of the following two conditions:

• If loss of power flow on the HVDC link at any instant compared with the power flow 2 seconds prior to current instant is more than 500 MW but less than or equal to 1000 MW.

• If one of the HVDC pole block on a line fault and the power flow on the HVDC link just prior to that instant was more than 1000 MW but less than or equal to 1500 MW.

Continue ……

SUGGESTED SCHEME: TRIP SIGNAL 2

• Trip Signal 2 would be initiated to obtain an additional relief of around 800 MW (in addition to 700 MW from Trip Signal 1) :

• If loss of power flow on the HVDC link at any instant compared with the power flow 2 seconds prior to current instant is more than 1000 MW.

• If one of the HVDC pole block on a line fault and the power flow on the HVDC link just prior to that instant was more than 1500 MW.

• Note: In the event of occurrence of Trip signal 2, the total relief would be of the order of around 1500 MW.

Continue ……

STATE SUBSTATIONS RELIEF (MW)

REMARKS

A.P CHINAKAMPALLI 150 EARLIER THE SIGNAL WAS BEING SENT BY PLCC. NOW IT IS PROPOSED TO SEND THIS SIGNAL THROUGH WIDE BAND.

KARNATAKA KOLAR ICT 250 THROUGH LOCAL PILOT WIRING

HOODY THROUGH PLCC

TAMIL NADU HOSUR 300 THROUGH PLCC

SRIPERUMBUDUR EARLIER THE SIGNAL WAS BEING SENT BY PLCC. NOW IT IS PROPOSED TO SEND THIS SIGNAL THROUGH WIDE BAND.

SALEM EARLIER THE SIGNAL WAS BEING SENT BY PLCC. NOW IT IS PROPOSED TO SEND THIS SIGNAL THROUGH WIDE BAND.

TRIP SIGNAL 1: POINTS

Continue ……

STATE SUBSTATIONS RELIEF (MW)

REMARKS

A.P GOOTY SWITCHING STATION

200 SIGNAL WILL BE SENT THROUGH WIDE BAND

ANANTHAPUR -DO-

SOMAYAJULAPALLI

-DO-

KURNOOL -DO-

KARNATAKA SOMANAHALLI 200 EARLIER THE SIGNAL WAS BEING SENT BY PLCC. NOW IT IS PROPOSED TO SEND THIS SIGNAL THROUGH WIDE BAND.

KERALA TRICHUR NORTH 200 SIGNAL WILL BE SENT THROUGH WIDE BAND

KOZHIKODE -DO-

TAMIL NADU MADURAI 200 -DO-

KARAIKUDI -DO-

THIRUVARUR -DO-

TRICHY 230 -DO-

INGUR -DO-

TRIP SIGNAL 2: POINTS

Continue ……

LOCATIONSIN DIFFERENT STATES

LOGIC DIAGRAM FOR PROPOSED GENERATION OF GRADED SIGNAL AT KOLAR FOR COMPENSATING DIFFERENT LOSS OF POWER FLOW IN HVDC TALCHER-KOLAR LINK

AND TRANSMISSION OF TRIP SIGNAL TO DIFFERENT LOCATIONS

DC LINE FAULT WITH ANTECEDENT POWER FLOW ( ONE SEC PRIOR ) > 1000

MW AND ≤ 1500 MW

DC LINE FAULT WITH ANTECEDENT POWER FLOW (ONE SEC PRIOR) >

1500 MW

TALCHER – KOLAR HVDC

• DETAILS OF IMPORT OF ENERGY

• TRIPPING DETAILS

TALCHER-KOLAR IMPORT OF 23850MUs FROM ER THROUGH TALCHER-KOLAR UPTO NOV - 05

YEAR ---> 2002 2003 2004 2005

MONTHSTOTAL

ENERGY (IN MU)

MAX FLOW

(IN MW)

TOTAL ENERGY (IN MU)

MAX FLOW (IN MW)

TOTAL ENERGY (IN

MU)

MAX FLOW (IN MW)

TOTAL ENERGY (IN MU)

MAX FLOW (IN

MW)

JAN --- --- 311 850 805 1528 852 1583

FEB --- --- 273 1010 701 1508 775 1865

MAR --- --- 491 1316 837 1600 884 1507

APR --- --- 473 1183 923 1500 878 1600

MAY --- --- 172 1026 652 1385 704 1500

JUN --- --- 277 994 688 1416 691 1605

JUL --- --- 319 1075 759 1490 1254 1880

AUG --- --- 346 1088 628 1341 857 1600

SEP 6 200 512 1533 742 1552 732 1881

OCT 58 500 508 1458  829 1550 895 1834

NOV 77 500 470 1048  719 1600 999 1880

DEC 241 750  630 1383  882 1615

TOTAL 382   4782   9165   9521

AVERAGE 96   399   764   866

MAX FLOW

  750   1533   1615 1881

1. AT 16:18HRS, HUBLI BUS BECAME DEAD DUE TO INSULATOR BURST AT

HUBLI ON 220KV HUBLI-LINGAPUR.

KPTCL DETAILS

2. 400KV KAIGA-GUTTUR WAS ALREADY OUT.

3. NAGJHERI & KAIGA GENERATION WAS AROUND 800MW.

4. CHIKKODI, BELGAUM, NARENDRA, AMBEWADI & GOA LOADS ARE

AROUND 250-300MW.

5. POWER RUSHED TO GUTTUR THROUGH 220KV KAIGA-GUTTUR LINE.

6. AT 16:21HRS, 220KV KAIGA-GUTTUR LINE ALONG WITH KAIGA UNITS

TRIPPED.

7. KAIGA & NAGJHERI COMPLEX FREQUENCY SHOOT UP TO 52.6HZ.

8. SUBSEQUENTLY ALL UNITS @ NAGJHERI WERE TRIPPED AT 16:33HRS.

KAIGA TRIPPING ON 07th NOV 05

Inter Regional Links

Present IR CapacityPresent IR Capacity= 9,500 MW= 9,500 MW

700 MW700 MW

1200MW1200MW

2000MW2000MW

1200 MW1200 MW

900 MW900 MW30,500 MW

16,000

32,700 MW

34,500 MW

2300

1850 MW1850 MW

1650 MW1650 MW

Contd..

DEVELOPMENT OF NATIONAL GRID

NER

ER

NR

WR

SR

EXISTING

500MW

MW1000

MW500

GAZUWAKA

CHANDRAPUR

VINDHYACHAL

SASARAM

UNDERCONST.

EXISTING

400 kV

220 kV

BONGAIGAONBIRPARA

MALDA

KORBA BUDHIPADAR

KOLHAPUR

BELGAUM

U.SILERU

BALIMELA

DEHRISAHUPURI

MALANPUR

AURAIYA

PHASE-I(By 2002)

HVDC STATION

KOLAR

(KARNATAKA)

TALCHER

ORISSA)

TALCHER KOLAR HVDC LINE

LENGTH:100 KMS

INTER REGIONAL LINKS

CHIKKODI

KOLHAPUR

DETAILS

KALPAKKAM FAST BREEDER REACTOR(500 MW)

EVACUATION

ARANI

VILLUPURAM

ACHARAPAKKAM

KALPAKKAM

SPKOIL

KPFBR EVACUATION SCHEME

SIRUCHERIKANCHEEPURAM

TO SRIPERUMBUDUR

MAPS – KPFBR LINK IS THROUGH A 230 KV D/C CABLE WITH SPARE PHASE.

KPFBR

Contd..

KPFBR EVACUATION SCHEME

• KANCHEEPURAM AND SIRUCHERI ARE CONNECTED TO THE GRID THROUGH 220 KV NETWORK.

• POSSIBILITY OF CONNECTING THEM THROUGH LILO OF ARANI-SRIPERUMBUDUR MAY BE EXAMINED

• TWIN-MOOSE CAN BE CONSIDERED FOR ARANI LINE

• CHENNAI CITY ISLANDING SCHEME COULD BE EVOLVED AT 220 KV LEVEL WITH MAPS, NCTPS,ETS AND GMR

Contd..

CHENNAI RING MAIN

KOLAR

MELKOTTAIYUR

ALMATHI

FROM

NELLORE

SRIPERUMBUDUR

TO NEYVELI

TO CHITTOOR

BACKUP TRANSMISSION SYSTEM TO CATER TO OUTAGE

OF TALCHER KOLAROPERATIONAL STUDIES

OPERATIONAL STUDY FOR BACKUP TRANSMISSION SYSTEM FOR TALCHER-KOLAR OUTAGE

400 KV SYSTEM

GENERATION PATTERN ASSUMED•SIMHADRI 1000 MW

•IMPORT AT GAZUWAKA 1495 MW•GENERATION AT VEMAGIRI 1500 MW

•GENERATION AT VEMAGIRI INCLUDES VEMAGIRI CCGT +KONASEEMA+GOUTHAMI•LINES TO VEMAGIRI COMPLEX STATIONS

NOT MODELLED

GAZUWAKA

KALPAKA

SIMHADRI

VEMAGIRINUNNA

364 MW EACH 112 MW

EACH

620 MW EACH

1495 MW FROM ERTO

KHAMMAM384 MW EACH

NELLORE595 MW EACH

145 MWEACH

Contd..

OPERATIONAL STUDY FOR BACKUP TRANSMISSION SYSTEM FOR TALCHER-KOLAR OUTAGE

220 KV SYSTEMANNEXURE-1

PAGE 2 OF 2

FROMKALPAKA

VEMAGIRINUNNA

10 MWEACH

BOMMUR

VJS(N)

123 MWEACH

102 MWEACH

TO VTS

128 MW

BHIMADOLU

141 MWEACH

PEDDAPURAM

135 MW

BHIMAVARAM

NIDADAVOLU

302

400 KV BUS

142 MW

96 MW EACH

Contd..

SUMMARY OF STUDY • THE 400 KV EVACUATION LINES FROM NUNNA , ESPECIALLY,

NUNNA-NELLORE-CHENNAI MAY FACE INCREASED LOADINGS DEPENDING ON THE LOAD PROFILE IN N.COASTAL AP AND TN + KERALA SYSTEMS.

• HOWEVER, WITH THE CHANGE IN LOAD PATTERN IN AP SYSTEM, AS WELL AS IN DIFFERENT ZONES IN AP, THE LINE LOADING PATTERN SHALL CHANGE AND IN ORDER TO ARRIVE AT A CORRECT DECISION AS FAR AS PLANNING OF TRANSMISSION NETWORK IS CONCERNED, THE STUDIES NEEDED TO BE CARRIED OUT.

• MORE GAS/CCGT GENERATION IS LIKELY TO COME IN THE BASIN AREA , WHEREAS THERE MAY NOT BE SUBSTANTIAL LOAD INCREASE.

• VIJAYAWADA WOULD BECOME A POOLING POINT– PROTECTION ISSUES– SC LEVELS

• SPS SYSTEM TO BE WIRED FROM TALCHER TO SENSE POLE OUTAGE AND RAMP POWER AT GAZUWAKA

RAICHUR-PARLE LINE

OPERATIONAL ASPECTS

PARLE(WR)-RAICHUR(SR)

N’SAGAR

MEHBOOBNAGAR

PARLE

RAICHUR

GUTTUR

GOOTY

HIRIYUR

NELMANGALA

MBD

HOODY

TO MYS/KOZHI

KURNOOL

S’HALLI

FROM KAIGA

FROM STRP

Contd..

OPERATIONAL ISSUES• SYNCHRONOUS OPERATION OF SR WITH CENTRAL GRID

– EXPERIENCE FROM OPERATING THE INTERCONNECTED GRID YET TO BE GAINED

– SINGLE LINK MAY CAUSE PROBLEMS ESPECIALLY ON TRIPPING OF TALCHER-KOLAR

– EVACUATION FROM RAICHUR MAY ALSO CAUSE PROBLEMS – NEED FOR EXTENSIVE STRENGTHENING

• BLACK START RESTORATION– IS SR IS CONNECTED ASYNCHROUNOUSLY, STARTUP POWER

FOR RESTORATION OF CENTRAL GRID COULD BE SOURCED FROM SR

• OPERATION OF HYBRID NETWORK UNDER CONTINGENCY INVOLVES GOOD PERCEPTION AND FAST SET POINT CHANGES IF DONE MANUALLY

• NETWORK SHOULD BE SUFFICIENTLY MATURE WITH PROPER PROTECTION SYSTEM IN PLACE

• COST-RELIABILITY TRADE-OFF

REGIONAL POWER COMMITTEE

• RESOLUTION

• MINUTES OF MEETING HELD ON 06th SEPT 2005 REGARDING ESTABLISHMENT OF RPC