400kv Protection presentation

400KV PROTECTION PREPARED BY GOPALA KRISHNA PALEPU ADE/APTRANSCO [email protected], Mobile:9440336984

BASICS OF ONE AND HALF CIRCUIT BREAKER SCHEME PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

ONE & HALF BREAKER DESCRIPTION BUS-1

1. IN THIS TWO BUSES ARE PRIOVIDED.

BUS-1

BUS-2

BUS-2


2. THESE TWO BUSES ARE INTER-CONNECTED BY THREE CIRCUIT BREAKERS.

BUS-1

BUS-2

BUS-2


3. THEY ARE DESIGNATED AS 1-52 CB, 2-52 CB, 3-52 CB.

1-52 CB

BUS-1

BUS-2

1-52 CB

3-52 CB

2-52 CB

2-52 CB

3-52 CB BUS-2


4. LINE - 1 IS CONNECTED IN BETWEEN 1-52 CB & 2-52 CB. 5. LINE - 2 IS CONNECTED IN BETWEEN 3-52 CB & 2-52 CB.

1-52 CB

LINE-1

BUS-1

BUS-2

1-52 CB

3-52 CB

2-52 CB

LINE-2 2-52 CB

3-52 CB LINE-1 BUS-2

LINE-2

ONE & HALF BREAKER DESCRIPTION BUS-1 1-52 CB

LINE-1

6. LINE-1 HAVING TWO FEEDING PATHS i.e A. VIA BUS-1 & 1-52 CB B. VIA BUS-2, 3-52 CB & 2-52 CB 7. LINE-2 HAVING TWO FEEDING PATHS i.e A. VIA BUS-2 & 3-52 CB B. VIA BUS-1, 1-52 CB & 2-52 CB

BUS-1

BUS-2

1-52 CB

3-52 CB

2-52 CB

LINE-2

2-52 CB


LINE-2


8. FOR INTURUPTING LINE-1 THE 1-52CB AND 2-52CB IS TO BE TRIPPED. 9. FOR INTURUPTING LINE-2 THE 3-52CB AND 2-52CB IS TO BE TRIPPED.

1-52 CB

LINE-1

BUS-1

BUS-2

1-52 CB

3-52 CB

2-52 CB

LINE-2 2-52 CB


LINE-2


10. FOR ANY PROBLEM IN LINE-1 OR LINE-2 ALONG WITH MAIN BREAKER THE MIDDLE BREAKER OR SAY TIE BREAKER (2-52 CB) MUST TRIP.

1-52 CB

LINE-1

BUS-1

BUS-2

1-52 CB

3-52 CB

2-52 CB

LINE-2 2-52 CB


LINE-2

ONE & HALF BREAKER DESCRIPTION BUS-1 1-52 CB

LINE-1

11. NORMALLY IN ALL TYPES OF BUSBAR CONFIGUARATIONS ONE BREAKER IS SUFFICIENT FOR ONE FEEDER. 12. HERE TWO FEEDERS ARE CONTROLED BY THREE BREAKERS. 13. SO THESE TWO FEEDERS CONTROLLED BY THREE CIRCUIT BREAKERS IT IS CALLED ONE & HALF BREAKER SYSTEM.

BUS-1

BUS-2

1-52 CB

3-52 CB

2-52 CB

LINE-2 2-52 CB


LINE-2

1-52 CB

LINE-1

2-52 CB

LINE-2

14. THE BAY BETWEEN BUS-1 & LINE-1 IS CALLED MAIN BAY FOR FEEDER-1.

BUS-1

MAIN BAY(1ST BAY) FOR FEEDER FEEDER-1

BUS-1

MAIN BAY(1ST BAY) FOR FEEDER-1

ONE & HALF BREAKER DESCRIPTION

BUS-2

1-52 CB

3-52 CB

2-52 CB


LINE-2

LINE-1

2-52 CB

LINE-2

15. THE BAY BETWEEN LINE-1 & LINE-2 IS CALLED TIE BAY FOR FEEDER-1 & 2.

BUS-1


1-52 CB

TIE BAY (2ND BAY ) FOR FEEDER-1 & 2

BUS-1



BUS-2

1-52 CB

3-52 CB

2-52 CB


LINE-2

TIE BAY (2ND BAY ) FOR FEEDER-1 & 2.

LINE-2

3-52 CB BUS-2

BUS-1

BUS-2

1-52 CB

3-52 CB

2-52 CB

LINE-1

LINE-2


MAIN BAY(3RD BAY) FOR FEEDER-2

2-52 CB

16. THE BAY BETWEEN BUS-2 & LINE-2 IS CALLED MAIN BAY FOR FEEDER-2.


LINE-1


1-52 CB


BUS-1



LINE-2

3-52 CB BUS-2

BUS-1

BUS-2

1-52 CB

3-52 CB

2-52 CB

LINE-1

LINE-2



2-52 CB

17. IN THIS SYSTEM FULL DIA MEANS 2 FEEDERS CONTROLLED BY 3 CBs. 18. HALF DIA MEANS 1 FEEDER CONTROLLED BY 2 CBs. (Nothing but Double CB System)


LINE-1


1-52 CB


BUS-1




3-52 CB BUS-2

BUS-2

1-52 CB

3-52 CB

2-52 CB

LINE-1

LINE-2



LINE-2

BUS-1


2-52 CB

GOPALA KRISHNA PALEPU ADE/MRT/ T&C/400KV SS/ O/O CE/400KV / L&SS/ VS APTRANSCO, HYDERABAD [email protected] Mobile: 9440336984


LINE-1


1-52 CB


BUS-1

SUBSTATION DESIGN/LAYOUT (I (I--CONFIGUARATION)

DIA6

BAY17

BAY15

BAY18

BAY11

BAY14

BAY16

DIA5 BAY13

FEEDER11

BAY10

DIA4

FEEDER9

BAY12

BAY5

BAY4

DIA3

BAY6

BAY3

BAY2

BAY1

DIA2

FEEDER7

BAY8

BUS--1 DIA1 BUS

FEEDER5

BAY7

FEEDER3

BAY9

FEEDER1

BUS--2 BUS

FEEDER2

FEEDER4

FEEDER6

FEEDER8

FEEDER10

FEEDER12

SUBSTATION DESIGN/LAYOUT (D(D-CONFIGUARATION) FEEDER10 BAY14

BAY13

BAY7

DIA1

FEEDER9

BAY8

BAY3

BAY1

BAY2

FEEDER6

DIA3

BAY15

FEEDER5

FEEDER2

BAY9

FEEDER1

DIA5

BUS--1 BUS

BAY5

FEEDER3

BAY11

FEEDER4

FEEDER7

DIA6

BAY18

BAY16

DIA4

BAY12

BAY10

DIA2

BAY6

BAY4

BUS--2 BUS

BAY17

FEEDER8

FEEDER11

FEEDER12

CT METHODS IN ONE AND HALF CIRCUIT BREAKER SCHEME PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

DIFFERENT CT METHODS OF ONE & HALF BREAKER SYSTEM

CB LINE LINE LINE

CB

CB 3 CT METHOD CB 4 CT METHOD CB

CB

CB

5 CT METHOD CB

CB

CB

6 CT METHOD CB

CB

6 CT METHOD CB

CB

CB

6 CT METHOD CB

CB

CB

LINE LINE LINE

CB CB

CB

AT/F AT/F AT/F AT/F AT/F AT/F

8 CT METHOD LINE

AT/F

SINGLE BUS SYSTEM BUS

1-CT P2

5

4

3

2

1

1-89

1-89L

1-52CB BB-EVT / CVT

BUSBAR MAIN1 PROT (87BBM1+ LBB)

BUSBAR MAIN2 PROT (87BBM2+ LBB)

BCU + ENERGY METER FOR LINE

3

MAIN-2 PROTECTION MAINFOR LINE (21L2/87L2)

2

1-CVT

MAIN-1 PROTECTION MAINFOR LINE (21L1/87L1)

1

P1

1

2

3

LATEST CONCEPT REDUNDANT LINE PROTECTION, REDUNDANT ICT PROTECTION, REDUNDANT BUSBAR PROTECTION, LBB IS IN BUILT FUNCTION OF BUSBAR

400KV C.T. INFORMATION P1

P2

PRIMARY CONNECTIONS : P1 – P2 CURRENT RATING : 2000 AMPS

CORES

CORE-1 CORE-2 CORE-3

CLASS

PURPOSE

SECONDARY CONNECTIONS CURRENT RATING : 1A 2000/ 1A

1000/ 1A

500/ 1A __

PS

BUSBAR PROTECTION

1S1 – 1S3

1S1 – 1S2 1S2 – 1S3

PS

BUSBAR CHECKUP 2S1 – 2S3 PROTECTION

2S1 – 2S2 2S2 – 2S3

__

METERING

3S1 – 3S3 3S4 – 3S2

3S1 – 3S2 3S4 – 3S3

0.2

3S1 – 3S4

1

CORE-4

PS

4S1 – 4S3 4S1 – 4S2 MAIN-2 4S1 – 4S4 PROTECTION 4S4 – 4S2 4S4 – 4S3

CORE-5

PS

MAIN-1 5S1 – 5S4 PROTECTION

5S1 – 5S3 5S4 – 5S2

P1 P2

5S1 – 5S2 5S4 – 5S3

2

1

5

2

4

5 4

3 EYE BOLT DESIGN

3 HAIR PIN / U SHAPE DESIGN

DEAD TANK DESIGN

ONE & HALF BREAKER SYSTEM (3CT METHOD) BUS-1

BUS-2

1-89

3-89

1-52CB

3-52CB

P2

P2

1-CT

3-CT

P1

P1

1-89A

3-89A 2-CT P1

2-89A 2-52CB 1-89L

P2

2-89B 3-89T

LINE 1 T/F-1

CT CONNECTIONS IN 3CT METHOD CORE

1 – CT

2 – CT

3 – CT

CORE – 1

MAIN1 BUSBARBUSBAR-1 PROTECTION LBB IN BUILT (87BB1M1)

MAIN1 DIFFFERENTIAL PROTECTION FOR TRANSFORMER (87T1)


MAIN2 BUSBARBUSBAR-1 PROTECTION LBB INBUILT (87BB1M2)

BACKUP PROTECTION FOR TRANSFORMER (67 HV)


SPARE

HV BCU + HV ENERGY METER FOR AT/F HV

SPARE

BCU + ENERGY METER FOR FEEDER


HV BCU + HV ENERGY METER FOR AT/F HV

MAIN-2 LINE PROTECTION MAINFOR FEEDER (21 L2 / 87L2)



MAIN-1 LINE PROTECTION MAINFOR FEEDER (21L1/87L1)


( PS)

CORE – 2 ( PS)

CORE – 3 ( 0.2)

CORE – 4 (0.2)

CORE – 5 ( PS)

CORE – 6 ( PS)



1 – CT

2 – CT

3 – CT

CORE – 1









SPARE


MAIN MAIN--2 LINE PROTECTION FOR FEEDER (21 L2 / 87L2)





( PS)

CORE – 2 ( PS)

CORE – 3 (0.2)

CORE – 4 ( PS)

CORE – 5 ( PS)

BUSHING CT METERING CORE (0.2)

NORMALLY THIS SYTEM ADOPTS, WHEN ONE SIDE LINE, OTHER SIDE AUTO TRANSFORMER OR BUS REACTOR IS PROVIDED IN A DIA OF ONE AND HALF BREAKER SYSTEM, IF BUSHING CT METERING CORE IS AVAILABLE, THEN IT IS USED FOR HV BCU + HV ENERGY METER FOR AT/F HV OR BUS REACTOR


BUS-2

79+25 (BCU)

VBB1 VL1/VL2 OR VBB2


79+25 (BCU)

MAIN1:21L1 / 87L1

MAIN1:87T1

MAIN2: 21L2/87L2

B/U: 67HV

BCU+EM (L)

79+25 (BCU)

VBB2/VL2

MAIN1:21L1 / 87L1

BCU+EM (L)

B/U: 67HV

MAIN2: 21L2/87L2

LBB MAIN1:87T1

LINE 1

BU

87BB2M1

VBB1/VL1

ICT

MAIN1:87T1

87BB1M1

87BB2M2

B/U: 67LV

BU

BU

MAIN2:87T2

87BB1M2

BCU+EM (HV)

BU

SPARE

ONE & HALF BREAKER SYSTEM BUS-1

(3CT METHOD) – LINE PROTECTION

BCU+EM MAIN2: 21L2 MAIN1: 21L1

MAIN2 :87BB1 MAIN1: 87BB1

FIBER OPTIC

ABB Network Partner AG

1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16


REL 316*4

FIBER OPTIC C E

50Z +87BB CENTRAL UNIT LBB IS INBUILT BUSBAR

LINE C E

ONE & HALF BREAKER SYSTEM (3CT METHOD) – ICT PROTECTION BUS-2

TIE LBB

MAIN2 :87BB2 B/U: 67HV

MAIN1: 87BB2 BCU+EM

MAIN2: 87T2 ABB Network Partner AG


MAIN1: 87T1

B/U: 67LV

ICT


1

REL 316*4

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

C

C

E

E

ONE & HALF BREAKER ( 3 CT METHOD) WITH PROTECTION SCHEME 87BB1 BUSBAR--1 BUSBAR 79 CVT VBB1

VBB1

BF

21M1

VL1

25

VL1 / VL2 OR VBB2 87L

21M2

VL1

CVT

VL1 FEEDER1 / LINE1

79 VL1 / VBB1 VL2 / VBB2

25

BF

FEEDER2 / LINE2 CVT VL2

MAIN-1 MAIN-2 VBB2

VL2 / VL1 OR VBB1

CVT VBB2

79 25

PROTECTION OF LINE2 (OR TRANSFORMER, IF APPLICABLE)

BF BUSBAR--2 BUSBAR 87BB2

FOR TRANSFORMER PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .

MET+SYN

MAIN-1 MAIN-2

3-52CB

2-52CB

BUS-II BUS

87T1- ICT DIFF PROT1

87 BB M1 BUSBAR PROTN MAIN-1 87 BB M2 BUSBAR PROTN MAIN-2 67HV- ICT DIR O/C,E/F

21L1- LINE DIST PROT1 21L2- LINE DIST PROT2 87 BB M2 BUSBAR PROTN MAIN-2 87 BB M1 BUSBAR PROTN MAIN-1

1-52CB

MAIN-1 MAIN-2

BUS-I BUS

MAIN-1 MAIN-2 MET+SYN

ONE & HALF BREAKER ( 3 CT METHOD) WITH PROTECTION SCHEME

MET+SYN

DISTURBANCE RECORDER, EVENT RECORDER, FAULT LOCATOR ARE IN BUILT FUNCTIONS IN BOTH NUMERICAL DIST PROT RELAYS 21L1 & 21L2

DISTURBANCE RECORDER, EVENT RECORDER, ARE IN BUILT FUNCTIONS IN BOTH NUMERICAL DIFF PROT RELAYS 87T1 & 87T2

LATEST CONCEPT REDUNDANT LINE PROTECTION REDUNDANT ICT PROTECTION REDUNDANT DISTRIBUTED BUSBAR PROTECTION LBB IS IN BUILT FUNCTION OF BUSBAR

87T2- ICT DIFF PROT2 FOR ICT CVT IS NOT AVAILABLE. ACCORDING TO CONDITION IT IS SELECTED BUS-1 CVT OR BUS-2 CVT OR LINE CVT HV & LV OVER FLUX PROT ARE IN BUILT. ICT HV METERING IS BUSHING CT


BUS-2

1-89

3-89

1-52CB

3-52CB

P2

P2

3-CT

1-CT

P1

P1

1-89A

3-89A 2-ACT P2

2-89A 1-89L

P1

2-BCT P1

2-52CB

P2

2-89B 3-89T

LINE 1 T/F-1


1- CT

CORE--1 CORE


(PS)

CORE--2 CORE (PS)

CORE--3 CORE (0.2)

CORE--4 CORE (PS)

CORE--5 CORE (PS)

2-BCT SPARE

2-ACT

3-CT

SPARE



TIE LBB

SPARE




HV BCU + HV ENERGY METER FOR ICT HV


MAIN-2 LINE MAINPROTECTION FOR FEEDER (21 L2 / 87L2)

MAIN-2 LINE MAINPROTECTION FOR FEEDER (21 L2 / 87L2)



MAIN-1 LINE MAINPROTECTION FOR FEEDER (21L1/87L1)

MAIN-1 LINE MAINPROTECTION FOR FEEDER (21L1/87L1)

MAIN1-ICT MAIN1DIFFFERENTIAL PROTECTION FOR TRANSFORMER (87T1)

MAIN1 –ICT DIFFFERENTIAL PROTECTION FOR TRANSFORMER (87T1)

ONE & HALF BREAKER SYSTEM (4 CT METHOD) BUS-1

BUS-2


79+25 (BCU)

VBB2

79+25 (BCU)

VL2/VL1 OR VBB1

MAIN1:21L1 / 87L1

MAIN1:87T1

MAIN2: 21L2/87L2

B/U: 67HV

BU

87BB1M1

VBB1/VL1

79+25 (BCU)

BU

87BB2M2

BU

87BB2M1

VBB2/VL2 B/U: 67LV

87BB1M2

MAIN1:21L1 / 87L1

MAIN2: 21L2/87L2

BCU+EM (L)

TIE LBB

BCU+EM (HV)

B/U: 67HV

MAIN1:87T1

LINE 1

ICT MAIN2:87T2

BU

MAIN1:87T1

BCU+EM (HV)

BCU+EM (L)



BCU+EM(L) MAIN2: 21L2 MAIN1: 21L1

MAIN2 :87BB1

TIE LBB

MAIN1: 87BB1

FIBER OPTIC


1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16


REL 316*4

FIBER OPTIC C E


LINE C E

ONE & HALF BREAKER SYSTEM (4CT METHOD) – ICT PROTECTION BUS-2 MAIN2 :87BB2 B/U: 67HV

MAIN1: 87BB2 BCU+EM (HV)



MAIN1: 87T1

B/U: 67LV

ICT


1

REL 316*4

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

C

C

E

E


VBB1

BF

21M1

VL1

25

VL1 / VL2 OR VBB2 87L

21M2

VL1

CVT

VL1 FEEDER1 / LINE1


25

BF


MAIN-1 MAIN-2 VBB2

VL2 / VL1 OR VBB1

CVT VBB2

79 25




MET+SYN

DISTURBANCE RECORDER, EVENT RECORDER, FAULT LOCATOR ARE IN BUILT FUNCTIONS IN BOTH NUMERICAL DIST PROT RELAYS 21L1 & 21L2

DISTURBANCE RECORDER, EVENT RECORDER, ARE IN BUILT FUNCTIONS IN BOTH NUMERICAL DIFF PROT RELAYS 87T1 & 87T2

87T2- ICT DIFF PROT2

LATEST CONCEPT REDUNDANT LINE PROTECTION REDUNDANT ICT PROTECTION REDUNDANT DISTRIBUTED BUSBAR PROTECTION LBB IS IN BUILT FUNCTION OF BUSBAR

FOR ICT CVT IS NOT AVAILABLE. ACCORDING TO CONDITION IT IS SELECTED BUS-1 CVT OR BUS-2 CVT OR LINE CVT HV & LV OVER FLUX PROT ARE IN BUILT

MET+SYN

MAIN-1 MAIN-2

3-52CB

2-52CB

BUS-II BUS

87 BB M1 BUSBAR PROTN MAIN-1 87 BB M2 BUSBAR PROTN MAIN-2 67HV- ICT DIR O/C,E/F 87T1- ICT DIFF PROT1

21L1- LINE DIST PROT1 21L2- LINE DIST PROT2 87 BB M2 BUSBAR PROTN MAIN-2 87 BB M1 BUSBAR PROTN MAIN-1

1-52CB

MAIN-1 MAIN-2

BUS-I BUS

MAIN-1 MAIN-2 MET+SYN

ONE & HALF BREAKER ( 4 CT METHOD) WITH PROTECTION SCHEME


BUS-2

1-89

3-89

P1

P1

3A-CT

1A-CT

P2

P2

3-52CB

1-52CB P2

P2

3B-CT

1B-CT

P1

P1

1-89A

3-89A 2A-CT

P1

2-89A 1-89L

2B-CT

P2

P2

2-52CB

P1

2-89B 3-89T

T/F-1 LINE 1

CURRENT TRANSFORMER CONNECTIONS IN 6CT METHOD (GIS or AIS with DEAD TANK CBs) 1B1B-CT

1A1A-CT

2B2B-CT

2A 2A--CT

3A 3A--CT

3B3B-CT

CORE-1 CORE(PS)

MAIN1 BUSBAR--1 BUSBAR PROTN LBB IN BUILT (87BB1M1)

2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO MAIN--1 PROTECTION MAIN

2CT’s SECONDARIES ARE CONNECTED CONNECTED TO MAIN--1 PROTECTION MAIN

MAIN1 BUSBAR--2 BUSBAR PROTN LBB IN BUILT (87BB2M1)

CORE-2 CORE(PS)

MAIN2 BUSBAR--1 BUSBAR PROTN LBB INBUILT (87BB1M2)

2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO MAIN--2 PROTECTION MAIN

2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO BACKUP PROTECTION

MAIN2 BUSBAR--2 BUSBAR PROTN LBB INBUILT (87BB2M2)

CORE-3 CORE(0.2)

SPARE

2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO

2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO

SPARE




BUS-2

MAIN1:21L1 / 87L1

MAIN1:87T1

MAIN2: 21L2/87L2

B/U: 67HV

87BB1M1

79+25 (BCU)

BU

87BB2M2

BU

87BB2M1

MAIN1:21L1 / 87L1

MAIN2: 21L2/87L2

BCU+EM (L)

TIE LBB

BCU+EM (HV)

B/U: 67HV

MAIN1:87T1

LINE 1

ICT

MAIN1:87T1

BU

BCU+EM (HV)

B/U: 67LV

87BB1M2

79+25 (BCU)

MAIN2:87T2

BU

VL2/VL1 OR VBB1

VBB1/VL1

BCU+EM (L)

VBB2

VBB2/VL2


79+25 (BCU)



BCU+EM(L) MAIN2: 21L2 MAIN1: 21L1

MAIN2 :87BB1

TIE LBB

MAIN1: 87BB1

FIBER OPTIC


1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16


REL 316*4

FIBER OPTIC C E


LINE C E

ONE & HALF BREAKER SYSTEM (6CT METHOD) – ICT PROTECTION BUS-2 MAIN2 :87BB2 B/U: 67HV

MAIN1: 87BB2 BCU+EM (HV)



MAIN1: 87T1

B/U: 67LV

ICT


1

REL 316*4

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

C

C

E

E

ONE & HALF BREAKER ( 6 CT METHOD) WITH PROTECTION SCHEME 87BB1 BUSBAR--1 BUSBAR BF CVT

21M1

VL1

VBB1 79 VBB1

25

87L

VL1 / VL2 OR VBB2

21M2

VL1

CVT

VL1 FEEDER1 / LINE1


25

BF


MAIN-1

VBB2

VL2 / VL1 OR VBB1

CVT VBB2

MAIN-2

79 25




TYPICAL ONE & HALF BREAKER SYSTEM ADOPTED IN GIS DS : DISCONNECTOR SWITCH, GS: GROUNDING SWITCH, CT: CURRENT TRANSFORMER, VD: VOLTAGE DIVIDER


1-1/2 CB SYSTEM (SIEMENS VATECH) VD

VD

CT DS

CT CB

CT DS

DS

CT CB

GS

GS

GS

GS

VD GS

GS

GS

GS

VD

CT DS

DS

CT CB

DS


BUS-2

1-89

3-89

1-52CB

3-52CB P2

P2

3-CT

1-CT

P1

P1

1-89A

3-89A 2-CT P1

2-89A 1-89L

2-52CB

P2

2-89B 3-89T

P2

1L-CT

P2

3T-CT P1

P1

LINE 1 T/F-1


1-CT

CORE-1 CORE(PS)


CORE-2 CORE(PS)


1-LCT

3-TCT

3-CT MAIN1 BUSBARBUSBAR-2 PROTECTION LBB IN BUILT (87BB2M1)

TEED PROTPROT-1 (BAY 1&2)






BCU (L)

ENERGY METER (HV)

TEED PROTPROT-2 (BAY 1&2) + TIE LBB

CORE-3 CORE(0.2)

BCU (L)

ENERGY METER (L)

CORE-4 CORE(PS)


MAIN-2 MAINPROTECTION (21 L2 / 87L2)


MAIN-1 MAINPROTECTION (21L1/87L1)

CORE-5 CORE(PS)

2-CT


BACKUP-ICT BACKUPPROTECTION (67 HV) MAIN1-ICT MAIN1DIFFFERENTIAL PROTECTION (87T1)


SPARE BCU (HV) Bushing CT TEED PROTPROT-2 (BAY 2&3)


Paralleling of 2Nos CTs to the Main-1/Main-2/Backup line protection is not required. This gives better transient response. Separate STUB protection can be connected (Nothing BUT TEED Protection).

MAIN1:87T1 MAIN2: 21L2/87L2

B/U: 67HV

MAIN1:87T1 87BB2M2

87BB1M1

MAIN1:21L1 / 87L1

ICT

B/U: 67LV 87 TEED-2 TEED (2&3) 87 TEED-1 TEED (2&3)

BU 87BB2M1

SPARE

BU

87 TEED-1 TEED (1&2) 87 TEED-2 TEED (1&2) BCU (L) 87 TEED-2 TEED (2&3)

BU

87BB1M2

87 TEED-1 TEED (2&3)

BU

BCU (L) 87 TEED-2 TEED (1&2) 87 TEED-1 TEED (1&2)

EM (HV) EM (L)

MAIN2:87T2

BUS-2

(5CT METHOD) BUS-1

87 TEED-2 (3&2) 87 TEED-2 (1&2)

87 TEED-1 (3&2) 87 TEED-1 (1&2)

BCU (HV)

ONE & HALF BREAKER SYSTEM LBB



TIE LBB

BCU

87 TEED1 (BAY 1&2) ABB Network Partner AG

87 TEED2 (BAY 1&2)

1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

REL 316*4

C E

MAIN1: 21L1


MAIN2: 21L2


1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

REL 316*4

C E



LINE C E

EM


87 TEED1 (BAY 2&3) 87 TEED2 (BAY 2&3) MAIN2 :87BB2 MAIN1: 87BB2 ABB Network Partner AG

1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

EM

REL 316*4

C E

B/U: 67HV


ICT MAIN1: 87T1


B/U: 67LV


1

REL 316*4

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

C

C

E

E

ONE & HALF BREAKER SYSTEM (5CT METHOD) – ICT – BUSHING CT PROTECTION

MAIN2: 87T2

BCU((HV)

MAIN2: 87T2

3-PH LOW IMPEDANCE

3-PH HIGH IMPEDANCE


VBB1

21M1 BF

VL1

87 TD1 HZ

25

VL1 / VL2 OR VBB2

.

87L

87 TD2 LZ

21M2

VL1

CVT

VL1 FEEDER1 / LINE1


25

BF

FEEDER2 / LINE2

.

CVT VL2 MAIN-1

87 TD2 LZ VBB2

VL2 / VL1 OR VBB1

CVT VBB2

PROTECTION OF LINE2 (OR TRANSFORMER, IF APPLICABLE) MAIN-2

79 25

BF

87 TD1 HZ BUSBAR--2 BUSBAR

87BB2



BUS-2

1-89

3-89

1-52CB

3-52CB P2

P2

3-CT

1-CT

P1

P1

1-89A

3-89A 2B-CT

2A-CT P2

2-89A 1-89L P2

1L-CT P1

P1

P1

2-52CB

P2

2-89B 3-89T P2

3T-CT P1

T/F-1 LINE 1

CT CONNECTIONS IN 6CT METHOD 1-CT

1L1L-CT

2A 2A--CT

2B 2B--CT

3T3T-CT

3-CT

TEED PROT--1 PROT (BAY 2&3)

MAIN1 BUSBAR--2 BUSBAR PROTECTION LBB IN BUILT (87BB2M1)


MAIN2 BUSBAR--2 BUSBAR PROTECTION LBB INBUILT (87BB2M2)

CORE-1 CORE(PS)

MAIN1 BUSBAR--1 BUSBAR PROTECTION LBB IN BUILT (87BB1M1)

CORE-2 CORE(PS)

MAIN2 BUSBAR--1 BUSBAR PROTECTION LBB INBUILT (87BB1M2)


TIE LBB

SPARE

BCU (L)

ENERGY METER

BCU (HV)

BCU (L)

ENERGY METER

BCU (HV)





BACKUP-ICT BACKUPPROTECTION (67 HV)






MAIN1 - ICT


CORE-3 CORE(0.2) CORE--4 CORE (PS) CORE-5 CORE(PS)


SPARE

SPARE

DIFFERENTIAL

PROTECTION

(87T1)

87BB2M2

87BB1M1


B/U: 67HV

MAIN1:87T1 87 TEED-2 TEED (2&3) 87 TEED-1 TEED (2&3)

BU 87BB2M1

BCU(HV)

BU

87 TEED-1 TEED (1&2) 87 TEED-2 TEED (1&2) BCU (L) BCU (HV) 87 TEED-2 TEED (2&3)

BU

87BB1M2


BU

BCU (L) 87 TEED-2 TEED (1&2) 87 TEED-1 TEED (1&2)

MAIN1:21L1 / 87L1

87 TEED-2 (1&2)

87 TEED-2 (3&2) 87 TEED-1 (1&2)

87 TEED-1 (3&2)

ICT

B/U: 67LV

BUS-2

(6CT METHOD) BUS-1

EM (HV) EM (L)

MAIN2:87T2




TIE LBB

BCU


87 TEED2 (BAY 1&2)

1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

REL 316*4

C E

MAIN1: 21L1


MAIN2: 21L2


1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

REL 316*4

C E



LINE C E

EM


87 TEED1 (BAY 2&3)

BCU(HV)

87 TEED2 (BAY 2&3) MAIN2 :87BB2 MAIN1: 87BB2 ABB Network Partner AG

1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

EM(HV)

REL 316*4

C E

B/U: 67HV


ICT MAIN1: 87T1


B/U: 67LV


1

REL 316*4

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

C

C

E

E


MAIN2: 87T2

3-PH HIGH IMPEDANCE

MAIN2: 87T2

3-PH LOW IMPEDANCE


VBB1

21M1 BF

VL1

87 TD1 HZ

25

VL1 / VL2 OR VBB2

.

87L

87 TD2 LZ

21M2

VL1

CVT

VL1 FEEDER1 / LINE1


25

BF

FEEDER2 / LINE2

.

CVT VL2 MAIN-1

87 TD2 LZ VBB2

VL2 / VL1 OR VBB1

CVT VBB2


79 25

BF

87 TD1 HZ BUSBAR--2 BUSBAR

87BB2



BUS-2

1-89

3-89

P1

P1

3A-CT

1A-CT P2

P2

1-52CB

3-52CB P2

P2

3B-CT

1B-CT

P1

P1

1-89A

3-89A 2A-CT

P1

2-89A 1-89L P2

1L-CT P1

P2

2B-CT P2

2-52CB

P1

2-89B 3-89T P2

3T-CT P1

T/F-1 LINE 1

CT CONNECTIONS IN 8CT METHOD 1B1B-CT

CORE-1 CORE(PS) CORE-2 CORE(PS)

MAIN1 BUSBAR--1 BUSBAR PROTECTION LBB IN BUILT (87BB1M1) MAIN2 BUSBAR--1 BUSBAR PROTECTION LBB INBUILT (87BB1M2)

1A1A-CT TEEDPROT-1 TEEDPROT(BAY 1&2)

1L1L-CT TEED PROTPROT-1 (BAY 1&2)

2B 2B--CT TEED PROTPROT-1 (BAY 1&2)

2A 2A--CT TEED PROTPROT-1 (BAY 2&3)

TEED PROTPROT-2 TEED PROTPROT-2 TEED PROTPROT-2 TEED PROTPROT-2 (BAY 1&2) (BAY 1&2) (BAY 1&2) (BAY 2&3)

CORE-3 CORE(0.2)

BCU (L)

CORE-4 CORE(PS)

TEED-1 FOR BAY-1 & 2 IS: 1L-CT, 1A-CT & 2A-CT

CORE-5 CORE(PS)

TEED-2 FOR BAY-1 & 2 IS: 1L-CT, 1B-CT & 2B-CT

SPARE

ENERGY METER (L)

BCU (L)

BCU (HV)

3T 3T--CT TEED PROTPROT-1 (BAY 2&3)

ENERGY METER (HV) MAIN1--ICT MAIN1 DIFFFERENTIAL

PROTECTION

PROTECTION

(21L2/87L2)

(87T1)

MAIN-1 MAINLINE

B/U B/U--ICT

(21L1/87L1)


TEED PROTPROT-2 TEED PROTPROT-2 (BAY 2&3) (BAY 2&3)

MAIN-2 MAINLINE

PROTECTION

3A 3A--CT

PROTECTION

(67 HV)

SPARE

3B 3B--CT MAIN1 BUSBAR--2 BUSBAR PROTECTION LBB IN BUILT (87BB2M1) MAIN2 BUSBAR--2 BUSBAR PROTECTION LBB INBUILT (87BB2M2)

BCU (HV)

TEED-1 FOR BAY-2 & 3 IS: 3T-CT, 3A-CT & 2B-CT TEED-2 FOR BAY-2 & 3 IS: 3T-CT, 3B-CT & 2A-CT

87BB2M2

87BB1M1


B/U: 67HV

MAIN1:87T1 87 TEED-2 TEED (2&3) 87 TEED-1 TEED (2&3)

BU 87BB2M1

BCU(HV)

BU

87 TEED-1 TEED (1&2) 87 TEED-2 TEED (1&2) BCU (L) BCU (HV) 87 TEED-2 TEED (2&3)

BU

87BB1M2


BU

BCU (L)

87 TEED-2 TEED (1&2) 87 TEED-1 TEED (1&2)

MAIN1:21L1 / 87L1

87 TEED-2 (1&2)

87 TEED-2 (3&2) 87 TEED-1 (1&2)

87 TEED-1 (3&2)

ICT

B/U: 67LV

BUS-2

(8CT METHOD) BUS-1

EM (HV) EM (L)

MAIN2:87T2




TIE LBB

BCU


87 TEED2 (BAY 1&2)

1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

REL 316*4

C E

MAIN1: 21L1


MAIN2: 21L2


1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

REL 316*4

C E



LINE C E

EM


87 TEED1 (BAY 2&3)

BCU(HV)

87 TEED2 (BAY 2&3) MAIN2 :87BB2 MAIN1: 87BB2 ABB Network Partner AG

1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

REL 316*4

EM(HV) C E

B/U: 67HV


ICT MAIN1: 87T1


B/U: 67LV


1

REL 316*4

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

C

C

E

E


MAIN2: 87T2

3-PH HIGH IMPEDANCE

MAIN2: 87T2

3-PH LOW IMPEDANCE

ONE & HALF BREAKER ( 8 CT METHOD) WITH PROTECTION SCHEME 87BB1 BUSBAR--1 BUSBAR 79

.

BF

CVT VBB1

VBB1

21M1

VL1

87 TD1 HZ

25

VL1 / VL2 OR VBB2

.

87L

87 TD2 LZ

21M2

VL1

CVT

VL1 FEEDER1 / LINE1


25

BF

FEEDER2 / LINE2

. BF VBB2

VL2 / VL1 OR VBB1

CVT VBB2

CVT VL2 MAIN-1

87 TD2 LZ


79 87 TD1 HZ

25

BUSBAR--2 BUSBAR 87BB2



3A3A-CT

6B6B-CT

6A6A-CT

5B5B-CT

6T6T-CT

3B3B-CT

2B2B-CT

4B4B-CT

3T3T-CT

5A5A-CT

1B1B-CT

4A4A-CT

4L4L-CT

2A2A-CT

1A1A-CT

1L1L-CT

NUMERICAL BUSBAR SCHEME INCL LBB/BFR/CBF (DECENTRALISED & CENTRALISED ARCHITECTURE) DECENTRALISED CONCEPT FO

CENTRALISED CONCEPT

(REB 500) ABB

BU/PU

(REB 670) ABB

OR (7 SS 52) SIEMENS

(487B) SEL

FO OR

OR

BU/PU

OR (MICOM P740) AREVA

(MICOM P746) AREVA

BU/PU FO

BU / PU TO BUSBAR DIGITAL COMMUNICATION LBB INBUILT FEATURE

LBB INBUILT FEATURE

ADOPTED CT METHODS IN ANDHRA PRADESH CT METHODS 3 CT METHOD

SUBSTATION WARANGAL

UTILITY POWERGRID

4 CT METHOD

MALKARAM

APTRANSCO

6 CT METHOD

NOT AVAILABLE IN INDIA

5 CT METHOD

NUNNA

POWERGRID

6 CT METHOD

SIMHADRI

NTPC

8 CT METHOD

NOT AVAILABLE IN INDIA

BUS SECTION

NELLORE

APTRANSCO/ POWERGRID POWER GRID

COMPARISION BETWEEN DIFFERENT CT METHODS CT PURPOSE

3 CT METHOD

4 CT METHOD

6 CT METHOD

5 CT METHOD

6 CT METHOD

8 CT METHOD

MAIN1 & MAIN2 BUSBAR PROTECTION

1 CT

1 CT

1B CT

1 CT

1 CT

1B CT

MAIN-1 MAINMAIN--2 MAIN PROTECTION BCU & EM

ABOVE FOR BUSBUS-1

BLIND ZONE

3 CT

3B CT

3 CT

3 CT

3B CT

1 - CT & 2 - CT

1 CT & 2 B - CT

1 A – CT & 2 B – CT

1 L - CT

1 L - CT

1 L - CT

ABOVE FOR FEEDERFEEDER-1 BELOW FOR FEEDERFEEDER-2

ABOVE CT SECONDARIES ARE CONNECTED PARALLEL FOR FEEDERFEEDER-1 BELOW CT SECONDARIES ARE CONNECTED PARALLEL FOR FEEDERFEEDER-2 3 - CT & 2 A - CT

3 A - CT & 2 A - CT

3 L - CT

3 L - CT

3 L – CT

STUB--1 & STUBSTUB STUB-2 PROTECTION FOR LINE & AT/F

TEED--1 & TEEDTEED TEED-2 PROTECTION FOR LINE & AT/F

STUB-1 & STUB STUBSTUB--2 PROTECTION IS INBUILT PROTECTION FOR MAINMAIN-1 & MAINMAIN-2 RELAYS. STUB PROTECTION WORKS WHEN LINE ISOLATOR OPEN CONDITION ONLY.

TEED–1 IS HIGH IMPEDENCE DIFFERENTIAL RELAY & TEED– TEED--2 IS LOW IMPEDENCE DIFFERENTIAL RELAY. TEED

A FAULT BETWEEN CIRCUIT BREAKERS AND CT (END FAULT) MAY THEN STILL BE FED FROM ONE SIDE EVEN WHEN THE BREAKER HAS BEEN OPENED. CONSEQUENTLY, FINAL FAULT CLEARING BY CASCADED TRIPPING HAS TO BE ACCEPTED IN THIS CASE. THIS SITUATION LBB/BFR OPERATES AND TIME TAKEN TO CLEAR FAULT IS ABOUT 300 mSECs mSECs.. THIS IS BLIND ZONE AREA.

MINIMUM CT METHOD

ADVANTAGES

BELOW FOR BUS BUS--2

3 CT

3 - CT & 2 – CT ADDITIONAL PROTECTION AVAILABLE

&

TIE CB BLIND ZONE AREA IS TAKEN CARE.

MAIN CB & TIE CB BLIND ZONE AREA IS TAKEN CARE

WHEN THE FAULT IS TAKEN PLACE BETWEEN THE MAIN CB, TIE CB & LINE ISOLATOR, DURING SERVICE ONLY, DISTANCE SCHEME SHOULD TAKE CARE. CARE.

BLIND ZONE FOR MAIN CB & TIE CB

TIE CB BLIND ZONE AREA IS TAKEN CARE

GOOD PROTECTION SYSTEM

WHEN THE FAULT IS TAKEN PLACE BETWEEN THE MAIN CB, TIE CB & LINE ISOLATOR, TEED PROTECTION SHOULD TAKE CARE.

ADVANTAGES & DISADVANTAGES OF ONE & HALF BREAKER SYSTEM A.

ADVANTAGES: ADVANTAGES:

1. 2.

7. 8.

THREE CIRCUIT BREAKERS IN A FULL DIA ARE ALWAYS IN CLOSED POSITION. IF MAIN CB PROBLEM / FOR PERIODICAL MAINTANENCE, DURING THAT PERIOD THE FEEDER IS FEEDING FROM TIE CB & OTHER BUS . NEED NOT REQUIRE TRANSFER THE FEEDER. IF TIE CB PROBLEM / FOR PERIODICAL MAINTANENCE, DURING THAT PERIOD THE FEEDER IS FEEDING FROM MAIN CB & CONNECTED BUS. EVEN IF BOTH MAIN BREAKERS UNDER TROUBLE, DURING THAT PERIOD ONE FEEDER WORKS AS INCOMING AND OTHER FEEDER WORKS AS OUTGOING VIA TIE CB. (WITHOUT INTERUPTION TO FEEDERS) IF BUSBAR-1 OPERATED / FOR PERIODICAL MAINTANENCE, ONLY THE MAIN BREAKERS CONNECTED TO BUSBAR-1 WILL TRIP. DURING THAT PERIOD THE FEEDERS CONNECTED TO BUS-1 ARE FEEDING VIA TIE CB FROM BUS-2. IF BUSBAR-2 OPERATED / FOR PERIODICAL MAINTANENCE, ONLY THE MAIN BREAKERS CONNECTED TO BUSBAR-2 WILL TRIP. DURING THAT PERIOD THE FEEDERS CONNECTED TO BUS-2 ARE FEEDING VIA TIE CB FROM BUS-1. IN THIS BUSBAR PROTECTION IS SIMPLE AND NEED NOT REQUIRE SELECTION OF ISOLATOR. IT IS MORE RELIABLE SYSTEM FOR OPERATION & MAINTANENCE POINT OF VIEW.

B.

DISADVANTAGES

1.

CT CONNECTIONS & PROTECTION TRIP LOGICS ARE SOME WHAT COMPLICATED. COMPLEX CONTROL & PROTECTION PHILOSOPHY COST TOWARDS CTs, CIRCUIT BREAKERS & PANELS ARE TO BE INCREASED DUE TO EXTRA BAY. THE COST COMPARISION TABLE SHOWN IN NEXT PRESENTATION. THE OPERATIONS FOR OPERATOR POINT OF VIEW IS LITTLE BIT COMPLICATED WHEN COMPARED TO CONVENTIONAL SYSTEM. SPACE OCUPATION FOR BAY IS MORE i.e COST OF LAND IS INCREASE.

3. 4.

5.

6.

2. 3. 4.

COST COMPARISION BETWEEN CONVENTIONAL SYSTEM & ONE AND HALF BREAKER SYSTEM FOR FEEDER S.No

EQUIPMENT

CONVENTIONAL SYSTEM

1.

CIRCUIT BREAKERS

1 No

CURRENT TRANSFORMERS

FULL DIA (FOR 2 FEEDERS)

% INCREASE IN COST

3 Nos

50%

HALF DIA % INCREASE (FOR 1 FEEDER) IN COST 2 Nos

100%

INCLUDES THE COST OF CT MARSHELLING BOXES. 3 Sets

50%

2 Sets

100%

4 Sets

100%

2 Sets

100%

5 CT METHOD

5 Sets

125%

3 Sets

200%

6 CT METHOD

6 Sets

200%

3 Sets

200%

8 CT METHOD

8 Sets

300%

4 Sets

300%

3 SETS

30%

2 SETS

30%

3 CT METHOD 2.

ONE & HALF BREAKER SYSTEM

4 CT METHOD

1 Set

I SET

3.

CONTROL & RELAY PANELS

4.

BAY MARSHALLING BOXES (BMB)

1 No

3 Nos

50%

2 Nos

30%

5.

CONTROL CABLES

8 KM

30 KM

100%

20 KM

150%

NORMALLY EXTRA PANEL IS TIE BAY PANEL. PANEL. IT IS ARROUND 30% 30% COST OF MAIN PANEL.. BECAUSE IT IS NOT HAVING PROTECTION RELAYS ( M-1 & M-2 AND OTHER PANEL RELAYS) . ONLY TIE CB TRIPPING RELAYS & ASSOCIATED RELAYS(A/R +LBB). +LBB).

MAIN-1, MAINMAINMAIN-2 PROTECTION & METERING FOR LINE ADOPTED IN ONE AND HALF CIRCUIT BREAKER SCHEME

PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

NORMS OF PROTECTION FOLLOWED IN APTRANSCO FOR TRANSMISIION LINES & DISTRIBUTION LINES ( FEEDER / LINE PROTECTION )

Sr.No 1. 2. 3. 4.

VOLTAGE 11 KV LINES 33 KV LINES 66 KV LINES 132 KV LINES

MAIN MAIN-- 1 PROTECTION

MAIN--2 PROTECTION/ BACKUP PROTECTION MAIN

2 O/L + E/F ( 51 + 51N )

-

3 O/L + E/F ( 51 + 51N )

-

SWITCHED DISTANCE SCHEME OR NUMERICAL DISTANCE SCHEME (21P+ 21N)

DIRECTIONAL O/L & E/F RELAYS WITH HIGH SET ( 67 + 67N )

NON SWITCHED DISTANCE SCHEME OR

SWITCHED DISTANCE SCHEME OR

5.

220 KV LINES NUMERICAL DISTANCE SCHEME (21P + 21N) NUMERICAL DISTANCE SCHEME (21P+ 21N)

6.

DISTANCE SCHEME (21P + 21N) NUMERICAL DISTANCE SCHEME (21) OR LINE 400 KV LINES NUMERICAL + in BUILT DEF RELAY(67N) DIFFERENTIAL SCHEME (87L) WITH B/U 21

7.

DISTANCE SCHEME (21P + 21N) NUMERICAL DISTANCE SCHEME (21) OR LINE 765 KV LINES NUMERICAL + in BUILT DEF RELAY(67N) DIFFERENTIAL SCHEME (87L) WITH B/U 21

IF MAIN MAIN--1 & MAIN MAIN--2 ARE NUMERICAL RELAYS, BOTH SHOULD BE SEPARATE MEASURING PRINCIPLES (CHARECTERESTICS), MODELS AND ALGORITHAMS (SHOULD NOT BE DUPLICATED) AND ALL FEATURES SHOULD BE AVAILABLE IN BOTH SCHEMES AND BOTH RELAYS SHOULD BE 100% 100% REDENDENCY IN ALL ASPECTS ( COMPLEMENTARY TO EACH OTHER ) . DISSIMILAR CARRIER SCHEMES ARE TO BE SELECTED ( POTT & PUTT or BLOCK & UNBLOCK). UNBLOCK). OTHER WISE MAIN MAIN--2 MAY BE DIFFERENT MAKE OR PHASE COMPARISION PROTECTION/LINE DIFFERENTIAL PROTECTION WITH BACKUP DISTANCE PROTECTION IS TO BE ADOPTED. ADOPTED. BOTH M1 & M2 SHOULD CONTAIN DIRECTIONAL EARTH FAULT PROTECTION (67 67N) N) WITH DIRECTIONAL COMPARISION PICKUP SCHEME AS INBUILT FUNCTION FUNCTION.. ZONE-1: 80% OF MAIN LINE ZONEZONE--2: 100% OF MAIN LINE + 50% OF SHORTEST LINE AT OTHER END ZONE ZONE--3: 100% OF MAIN LINE + 100% OF SHORTEST LINE AT OTHER END ZONE ZONE--4: 100% OF MAIN LINE + (100% OF SHORTEST LINE + 20% OF LONGEST LINE) AT ZONE

OTHER END.

MAIN--1 PROTECTION FOR LINE (21L1) MAIN P2 P2 P2

CT MB

1-CT CTR: 2000-1000-500/1A

3 3 3

CORE-5

5S4

5S4

5S4

5S2

5S2

5S2

(3/4/6 CT METHOD) IR5 / A511

VR11 / E111

IY5 / A531

VY11 / E131

IB5 / A551

VB11 / E151 VN11 / E171

IN5 / A571 1-CVT

CLASS: PS 3 CT METHOD : 1-CT & 2-CT 4 CT METHOD : 1-CT & 2-BCT 6 CT METHOD : 1-ACT & 2-BCT

CORE – 1 100VA CLASS: 3P

CT MB

2-BCT CTR: 2000-1000-500/1A

3 3 3

CORE-5

5S2

5S2

5S2

5S4

5S4

5S4

CLASS: PS

P2 P2 P2

MAIN--1 PROTECTION FOR LINE (21L1) MAIN (3/4/6 CT METHOD) (NEW DEVELOPMENT) P2 P2 P2

CT MB IR5 / A511 IY5 / A531 IB5 / A551

1-CT CTR: 2000-1000-500/1A

3 3 3

CORE-5

5S4

5S4

5S4

5S2

5S2

5S2

IN5 / A571

3 CT METHOD : 1-CT & 2-CT 4 CT METHOD : 1-CT & 2-BCT 6 CT METHOD : 1-ACT & 2-BCT

CLASS: PS

ESC

IN5 / A571

3 3 3

CTR: 2000-1000-500/1A

ENABLED TRIP

CT MB

2-BCT CORE-5

IA =250.10 A IB =250.10 A IC =250.10 A VAB =400.0 KV VBC =400.0 KV VCA =400.0 KV

5S2

5S2

5S2

5S4

5S4

5S4

CLASS: PS

IB5 / A551 IY5 / A531 IR5 / A511

P2 P2 P2

INST TIME COMM SOTF ZONE1 ZONE2 ZONE3 ZONE4

SEL

ENT

TARGET RESET

PH-A PH-B PH-C GND 50 51 79 RESET 79 LOCKOUT

SEL- 421 PROTECTION AUTOMATION CONTROL

VR11 / E111

1-CVT

VY11 / E131 VB11 / E151 VN11 / E171


MAIN--1 PROTECTION FOR LINE (21L1) MAIN (5/6/8 CT METHOD)

P2 P2 P2

IR5 / A511 IY5 / A531 IB5 / A551

1-LCT CTR: 2000-1000-500/1A

CLASS: PS

3 3 3

CORE-5

CT MB

5S4

5S4

5S4

5S2

5S2

5S2

VR11 / E111 VY11 / E131 VB11 / E151 VN11 / E171

IN5 / A571 1-CVT CORE – 1 100VA CLASS: 3P

MAIN--2 PROTECTION FOR LINE (21L2) MAIN (3/4/6 CT METHOD) P2 P2 P2

CT MB IR4 / C411 IY4 / C431 IB4 / C451

1-CT CTR: 2000-1000-500/1A

3 3 3

CORE-4

4S4

4S4

4S4

4S2

4S2

4S2

VY21 / E231 VB21 / E251 VN21 / E271 1-CVT



CT MB

2-BCT

3 3 3

CTR: 2000-1000-500/1A

VR21 / E211

IN4 / C471

CLASS: PS

CORE-4

21 L2

4S2

4S2

4S2

4S4

4S4

4S4

CLASS: PS

P2 P2 P2

50ZT LBB/BFR

MAIN--2 PROTECTION FOR LINE (21L2) MAIN (3/4/6 CT METHOD) ( NEW DEVELOPMENT) P2 P2 P2

CT MB

1-CT CTR: 2000-1000-500/1A

3 3 3

CORE-4

4S4

4S4

4S4

4S2

4S2

4S2

IR4 / C411

VR21 / E211

1-CVT

IY4 / C431 IB4 / C451

VY21 / E231 VB21 / E251 VN21 / E271

CORE – 2

IN4 / C471


CLASS: PS

CT MB

2-BCT CTR: 2000-1000-500/1A

3 3 3

CORE-4

IN4 / C471 4S2

4S2

4S2

4S4

4S4

4S4

CLASS: PS

P2 P2 P2

IB4 / C451 IY4 / C431 IR4 / C411

100VA CLASS: 3P

MULTI FUNCTION NUMERICAL RELAY FOR MULTI BREAKER, MULTI CT & CVT/PT APPLICATION 3-52 CB

BUS-1 PT

BUS-2 PT 59

50 BF-1 50 BF-2

79-1 79-2 25-1

25-2

21P 50P 51P 67P 27 21N 50N 51N 67N

3

3

LINE CVT LINE

3

3

3 3

2-52 CB

3

1-52 CB

3

(NEW APPLICATION) (ONE & HALF BREAKER SYSTEM or RING BUS SYSTEM)

1-52,2-52: MAIN & TIE CIRCUIT BREAKER 21P: PHASE DISTANCE PROTECTION 21N: GROUND DISTANCE PROTECTION 27: UNDER VOLTAGE RELAY 67: DIRECTIONAL RELAY 50: INST OVER CURRENT RELAY 51: TIME OVER CURRENT RELAY 59: OVER VOLTAGE RELAY 64: EARTH FAULT RELAY 50BF-1: LBB/BFR OF MAIN CB 50BF-2: LBB/BFR OF TIE CB 79-1,2: AUTO RECLOSURE RELAY OF MAIN & TIE CB 25-1,2: CHECK SYNCHRONISAM RELAY FOR MAIN & TIE CB

MAIN--2 PROTECTION FOR LINE (21L2) MAIN (5/6/8 CT METHOD)

P2 P2 P2

IR4 / C411 IY4 / C431 IB4 / C451

1-LCT CTR: 2000-1000-500/1A

CLASS: PS

3 3 3

CORE-4

CT MB

4S4

4S4

4S4

4S2

4S2

4S2

VR21 / E211 VY21 / E231 VB21 / E251 VN21 / E271

IN4 / C471 1-CVT CORE – 2 100VA CLASS: 3P

BAY CONTROL UNIT (BCU) & ENERGY METER (3/4/6 CT METHOD) P2 P2 P2

CT MB IR3 / D311 IY3 / D331 IB3 / D351

1-CT CTR: 2000-1000-500/1A

3 3 3

CORE-3

3S4

3S4

3S4

3S2

3S2

3S2

IN3 / D371

3 CT METHOD : 1 1-CT & 2-CT 4 CT METHOD : 1 1-CT & 2-BCT 6 CT METHOD : 1 1-ACT & 2-BCT

CLASS: 0.2

CT MB

2-BCT CTR: 2000-1000-500/1A

3 3 3

CORE-3

3S2

3S2

3S2

3S4

3S4

3S4

CLASS: 0.2

VR31 / E311 VY31 / E331 VB31 / E351 VN31 / E371 1-CVT CORE – 3 50VA

P2 P2 P2

CLASS: 0.2

BAY CONTROL UNIT (BCU) & ENERGY METER (5/6/8 CT METHOD) P2 P2 P2

IR3 / D311 IY3 / D331 IB3 / D351

1-LCT CTR: 2000-1000-500/1A

3 3 3

CORE-3

CT MB

3S4

3S4

3S4

3S2

3S2

3S2

CLASS: 0.2 IN3 / D371

VR31 / E311 VY31 / E331 VB31 / E351 VN31 / E371 1-CVT CORE – 3 50VA CLASS: 0.2

MAIN-1 & MAINMAINMAIN-2 PROTECTION FOR AUTO TRANSFORMER ADOPTED IN ONE AND HALF CIRCUIT BREAKER SCHEME


BASICS OF TRANSFORMER PROTECTION 1.

2.

3.

PURPOSE OF POWER TRANSFORMER PROTECTION POWER T/F PROTECTION IS USUALLY INSTALLED TO DISCONNECT THE T/F AT: A. INTERNAL SHORT CIRCUITS AND EARTH FAULTS IN THE T/F AND ITS CONNECTED CIRCUITS. B. EXTERNAL FAULTS ON OTHER CIRCUITS. (BACK-UP PROTECTION) C. ABNORMAL SERVICE CONDITIONS SUCH AS OVERLOAD & OVER VOLTAGE. PROTECTION DEVICES INBUILT OR MOUNTED ON POWER T/F A. OIL IMMERSED POWER T/F USUALLY HAVE A GAS DETECTOR AND OIL SURGE. DETECTOR (BUCHHOLZ ALARAM & TRIP DEVICES), WHICH ARE EXCELLENT FOR DETECTING INTERNAL FAULTS. B. LOAD TAPCHANGER COMPARTMENTS MAY HAVE A SIMILAR OVER PRESSURE DEVICE. C. TEMPARATURE MONITORS FOR OIL & WINDING PROVIDE GOOD OVER LOAD PROTECTION. D. PRESSURE RELIEF DEVICE IS PROVIDED TO SAFE GUARD THE T/F FROM HIGH PRESURES. TRANSFORMER DIFFERENTIAL PROTECTION IT IS WIDELY USED AS INSTANTANEOUS PROTECTION FOR SHORT CIRCUIT FAULTS WITH IN THE DIFFERENTIAL ZONE. THIS IS TREATED AS MAIN-1 PROT FOR T/F. THE MOST COMMON TYPE OF PROTECTION IS THE CURRENT RESTRAINT TYPE. SOME TYPE OF DIFFERENTIAL RELAYS REQUIRE INTERPOSING CTs FOR CT RATIO MATCHING AND/OR PHASE SHIFT. HIGH IMPEDENCE DIFFERENTIAL PROTECTION CAN BE USED ON AUTO T/F & REACTORS. IT COVERS ONE GALVANICALLY INTERCONNECTED WINDING (WDG DIFF). BUT NOT A SEPARATE TERTIARY WINDING. IT REQUIRES A THREE PHASE SET OF CTs AT THE NEUTRAL SIDE OF WINDING. 87T1: MAIN1 TRANSFORMER DIFFERENTIAL PROTECTION USING CONVENTIONAL CTs 87T2: MAIN2 TRANSFORMER DIFFERENTIAL PROTECTION USING BUSHING CTs

4.RESTRICTED 4.RESTRICTED EARTH FAULT PROTECTION AT/Fs are used to couple EHV Power Networks, If the Ratio of their Voltages is Moderate. An Alternative to Differential Protection that can be applied to AT/Fs. A Circulating Current System is arranged between Equal Ratio Current Transformers in the Two Groups of Line Connections and the Neutral End Connections. The Line Current Transformers can be connected in Parallel to A Single Element Relay, Thus providing a Scheme Responsive to Earth Faults Only. If Current Transformers are fitted in Each Phase at the Neutral End of the Windings and a Three-Element Relay is used, A Differential System can be provided, giving Full Protection against Phase and Earth Faults. This Provides High-speed Sensitive Protection. It is Unaffected by Ratio Changes on the Transformer due to Tap-changing and is immune to the Effects of Magnetizing In Rush Current. It does not respond to Interturn Faults. In Addition, This Scheme does not respond to any Fault in a Tertiary Winding. Unloaded Delta-connected Tertiary Windings are often not Protected.

5. BACK UP PROTECTION A VARIETY OF RELAYS ARE AVAILABLE. A. OVER CURRENT & EARTH FAULT PROTECTION. ( 50, 50N, 51, 51N, 67, 67N - ANY COMBINATION OF THESE) B. UNDER IMPEDENCE / DISTANCE ( Z<)(21T). C. NEUTRAL DISPLACEMENT PROTECTION (Un>).

6.OTHER 6.OTHER TYPES OF RELAYS A. OVER VOLTAGE RELAY (U >). B. OVER FLUX/ EXCITATION (V/F >)( INVERSE TIME & DIFENITE TIME). FOR 400KV/220KV & 765/400KV TRANSFORMERS BOTH SIDES( i.e HV & LV) OVER FLUX RELAYS ARE PROVIDED BECAUSE BOTH SIDES HAVING GRID. C. AT/F NEUTRAL CURRENT RELAY (51N).

NORMALLY ADOPTED POWER TRANSFORMERS CAPACITIES IN 400KV / 220KV CAPACITY OF TRANSFORMER

HV VOLTAGE

HV CURRENT

LV VOLTAGE

LV CURRENT

315 MVA 500 MVA 630 MVA

400 KV 400 KV 400 KV

454.68 A 721.71 A 909.35 A

220 KV 220 KV 220 KV

0826.68 A 1312.20 A 1653.37 A

NORMS OF PROTECTION FOLLOWED BY UTILITIES FOR POWER TRANSFORMERS & AUTO TRANSFORMERS

CAPACITY S.No IN MVA

VOLTAGE RATIO IN KV

220 / 33

400 / 132

8

100 & 160

220 / 132

9

315, 500 & 630

400 / 220

10

1000 & 1500

765 / 400

220 / 66

HV & LV REF 64

87 T2 / 64 REF

7

31.5, 50 & 100 100, 200 & 250

6

3 OL + 1 EL (51)

3 DIR OL (HIGHSET) + 1 DIR EL (HIGHSET)

LV

3 OL + 1 DIR EL (51P + 67N) 3 DIR OL (HIGHSET) + 1 DIR EL (HIGHSET)

ADDITIONAL SPECIAL PROTECTION PROTECTION BUCHHOLZ, OLTC OSR OIL TEMP WDNG TEMP

BUCHHOLZ OVER FLUX OLTC OSR PRV/PRD OIL TEMP WDNG TEMP

64REF IS 1-PH 1 PH HIGH IMPEDANCE DIFFERENTIAL RELAY 87T2 IS 3-PH 3 PH HIGH IMPEDANCE DIFFERENTIAL RELAY (PRINCPLE : CIRCULATING CURRENT)

31.5, 50

HV

3 OVER LOAD + 1 EARTH FAULT RELAY ( 51 )

5

BACK UP PROTECTION

3 OVER LOAD + 1 DIRECTIONAL EARTH FAULT RELAY ( 51P + 67N)

132 / 33

HV REF (64)

16 , 31.5 50 & 80

NIL

4

132 / 11

MAIN MAIN--2

PROTECTION

87 T1 DIFFERENTIAL RELAY

3

MAIN--1 MAIN

( LOW IMPEDANCE PERCENTAGE BIASED PHASE SEGREGATED DIFFERENTIAL RELAY PRINCIPLE: MERZ PRICE)

66 / 33

2

2 WINDING TRANSFORMER (STAR/STAR) ICT / AUTO TFR

66 / 11

7.5 & 16 7.5 , 16 & 25 7.5 , 16 , 25 & 31.5

1

T Y P E

OVER LOAD ALARM RELAY + NEUTRAL CURRENT E/F RELAY

ICT BUSHING CT INFORMATION S.No

ITEM /MVA

1

CORE

2

6 7

100

600/1

300/1

160

800/1

500/1

315

1000/1

600/1

500

1600/1

1000/1

3

--

1

2

600/1

500/1

800/1

800/1

1000/1

1000/1

1600/1

1600/1

3

--

1

2

600/1

600/1

800/1

800/1

1000/1

1000/1

1600/1

1600/1

NEUTRAL BUSHING CT : CORE-1 & 2 : BEFORE STAR FORMATION IN RYB PHASES, 100 600 V 600 V 600 V 600 V 600 V 600 V VKNEE FOR 160 800 V 800 V 800 V 800 V 800 V 800 V PS & 315 1000 V 1000 V 1000 V 1000 V 1000 V 1000 V VA FOR MET 500 1600V 1600V 1600 V 1600 V 1600 V 1600 V 100 1.5 1.5 1.5 1.5 1.5 1.5 160 2.0 2.0 2.0 2.0 2.0 2.0 RCT IN OHMS 315 2.5 2.5 2.5 2.5 2.5 2.5 500 4.0 4.0 4.0 4.0 4.0 4.0 100 100 100 100 100 100 100 I MAG IN 160 80 80 80 80 80 80 mA at 315 60 60 60 60 60 60 VKNEE 500 25 25 25 25 25 25 CLASS OF PS PS PS PS PS PS ACURACY PURPOSE

87T2(L)

87T2(H)

WTI

87T2(L)

87T2(H)

WTI

87T2(L)

87T2(H)

LV 3

--

Parameters of WTI CT for each winding shall be provided by the contractor

5

2

NEUTRAL


4

1

IV

Parameters of WTI CT for each winding shall be provided by the contractor.

3

RATIO

HV

WTI

SELECTION OF AUX.CTs FOR DIFFERENTIAL PROTECTION

NORMALLY 400KV/220KV AUTO TRANSFORMERS ARE OF CAPACITY 315MVA. FOR MERZ PRICE PROTECTION IF TRANSFORMER IS CONNECTED IN STAR/STAR THEN CT SECONDARIES ARE TO BE CONNECTED IN DELTA/DELTA. CORRECT RATIO CTs ARE NOT AVAILABLE, THEN AUX.CTs ARE TO BE PROVIDED FOR ACHEVING SUITABLE CURRENTS. IF AUX CTs ARE USING THEN MAIN CT SECONDARIES ARE CONNECTED IN STAR. THIS IS BROUGHT TO AUX CTs. AUX CTs PRIMARY IS CONNECTED IN STAR & SECONDARIES ARE CONNECTED IN DELTA. NORMALLY THE RELAY RATED CURRRENT IS 1A. AUX.CT s SECONDARIES ARE CONNECTED IN DELTA. FOR ACHIEVING 1A TO RELAY, AUX.CT SECONDARY CURRENT IS TO BE 0.577A. THE FULL LOAD PRIMARY CURRENT OF 315MVA AT/F IS 454.7A. BUT THE 400KV CTs RATIOs ARE AVAILABLE : 20002000-10001000-500/1A NEAREST VALUE TO FULL LOAD CURRENT IS 500/1A. HENCE IT IS ADOPTED. HENCE AT FULL LOAD HV CURRENT i.e 454.7A, THEN SECONDARY OF CT CURRENT WILL BE 0.91A. SO HV SIDE AUX.CT RATIO IS 0.91/0.577A. THE FULL LOAD SECONDARY CURRENT OF 315MVA AT/F IS 826.7A. BUT THE 220KV CTs RATIOs ARE AVAILABLE: 12001200-800/1A. NEAREST VALUE TO FULL LOAD CURRENT IS 1200/1A. HENCE IT IS ADOPTED. HENCE AT FULL LOAD LV CURRENT i.e 826.7A,THEN SECONDARY OF CT CURRENT WILL BE 0.689A. SO LV SIDE AUX CT RATIO IS 0.689/0.577A. SPECIAL INFORMATION: LATEST NUMERICAL RELAYS NEED NOT REQUIRE AUX CTs. IN THESE RELAYS, CT RATIOS MATCHING CAN BE PROGRAMMED.

MAIN -1(87T1) DIFFERENTIAL PROTECTION FOR ICT (3/4/6 CT METHOD) P2 P2 P2

CT MB

87 T1

CT MB

3-CT CTR: 2000-1000-500/1A

3 3 3

CORE-5

5S4

5S4

5S4

5S3

5S3

5S3

3 CT METHOD : 3-CT & 2-CT 4 CT METHOD : 3-CT & 2-ACT 6 CT METHOD : 3-ACT & 2-ACT

5S1

5S3

5S3

5S3

P2 P2 P2 LV-CT CORE-5 CTR: 1200-800/1A

CLASS: PS

CT MB

2-ACT

3 3 3

CTR: 2000-1000-500/1A

5S1

3 3 3

CLASS: PS

CORE-5

5S1

5S3

5S3

5S3

5S4

5S4

5S4

CLASS: PS

P2 P2 P2

IN CASE OF 1&1/2 CB SYSTEM, THE DIFFERENTIAL PROTECTION CTs ASSOCIATED WITH MAIN & TIE CBs SHOULD BE CONNECTED TO SEPARATE BIAS WINDINGS AND THESE SHOULD NOT BE PARALLED IN ORDER TO AVOID FALSE OPERATION DUE TO DISSIMILAR CT TRANSIENT RESPONSE.

NUMERICAL RELAYS DOES NOT REQUIRE AUX CTs

MAIN--1(87T1) DIFFERENTIAL PROTECTION FOR ICT MAIN (5/6/8 CT METHOD) 87 T1

P2 P2 P2

CT MB

CT MB

5S1

5S1

5S1

5S3

5S3

5S3

3 3 3

3-TCT CTR: 2000-1000-500/1A

3 3 3

CORE-5

5S4

5S4

5S4

5S3

5S3

5S3

P2 P2 P2 LV-CT

CLASS: PS

CORE-5 CTR: 1200-800/1A

CLASS: PS

NORMALLY LOW IMPEDENCE BIASED DIFFERENTIAL RELAY IS USED FOR TRANSFORMER DIFFERENTIAL PROTECTION NUMERICAL RELAYS DOES NOT REQUIRE AUX CTs

MAIN2 (87T2) : DIFFERENTIAL PROTECTION FOR ICT P2 P2 P2

87 T2 400KV HV

CORE-1

S2

S2

S2

S1

S1

S1

3 3 3

BUSHING CT CTR: 1000/1A

CLASS: PS P1 P1 P1 P1 P1 P1 NEUTRAL

CORE-1

S1

S1

S1

S2

S2

S2

3 3 3

BUSHING CT CTR: 1000/ 1A

CLASS: PS P2 P2 P2 P1 P1 P1 220KV LV

CORE-1 CTR: 1000/1A

S1

S1

S1

S2

S2

S2

3 3 3

BUSHING CT

CLASS: PS

P2 P2 P2


400KV HV

CORE-1

S2

S2

S2

S1

S1

S1

3 3 3


CLASS: PS P1 P1 P1 P1 NEUTRAL BUSHING CT

S1

3

CORE-1

S2

CTR: 1000/ 1A

P2

CLASS: PS

P1 P1 P1 220KV LV

CORE-1 CTR: 1000/1A

S1

S1

S1

S2

S2

S2

3 3 3

BUSHING CT

CLASS: PS

P2 P2 P2


400KV HV

CORE-2

S2

S2

S2

S1

S1

S1

87 T2

3 3 3

BUSHING CT


CORE-2

S1

S1

S1

S2

S2

S2

3 3 3



CORE-2 CTR: 1000/1A

S1

S1

S1

S2

S2

S2

3 3 3

BUSHING CT

CLASS: PS

P2 P2 P2

METROSIL (NON LINEAR RESISTOR)

CTR: 1000/1A

MAIN--2 (64 T) : REF PROTECTION FOR ICT MAIN P2 P2 P2

400KV HV

CORE-1

S2

S2

S2

S1

S1

S1

3 3 3



CORE-1

S1

S1

S1

S2

S2

S2

3 3 3



CORE-1 CTR: 1000/1A

S1

S1

S1

S2

S2

S2

3 3 3

BUSHING CT

CLASS: PS

P2 P2 P2


MAIN--2 (64 T) : REF PROTECTION FOR ICT MAIN P2 P2 P2

400KV HV

CORE-1

S2

S2

S2

S1

S1

S1

3 3 3


CLASS: PS


P1 P1 P1 P1 NEUTRAL BUSHING CT

S1

3

CORE-1

S2

CTR: 1000/ 1A

P2

CLASS: PS

P1 P1 P1 220KV LV

CORE-1 CTR: 1000/1A

S1

S1

S1

S2

S2

S2

3 3 3

BUSHING CT

CLASS: PS

P2 P2 P2

B/U 67 HV - BACKUP PROTECTION FOR ICT HV (3/4/5 CT METHOD) P2 P2 P2

CT MB

3-CT CTR: 2000-1000-500/1A

3 3 3

CORE-4

4S4

4S4

4S4

4S3

4S3

4S3

IR4 / C411 IY4 / C431 IB4 / C451

VR11 / E111

IN4 / C471

VB11 / E151

VY11 / E131

CLASS: PS 3 CT METHOD : 3-CT & 2-CT 4 CT METHOD : 3-CT & 2-ACT 6 CT METHOD : 3-ACT & 2-ACT

VN11 / E171

3 3 3 E172 E174 CT MB

CTR: 2000-1000-500/1A

3 3 3

CORE-4

4S3

4S3

4S4

4S4

4S4

CLASS: PS

P2 P2 P2

3 3

CVT SELECTION BUS-1 CVT / BUS-2 CVT / LINE CVT

2-ACT 4S3

3

CORE-2 VA : 100

IB4 / C451 IY4 / C431 IR4 / C411

CLASS: 3P

B/U 67 HV - BACKUP PROTECTION FOR ICT HV (5/6/8 CT METHOD) VR11 / E111 VY11 / E131 VB11 / E151 P2 P2 P2

3-TCT CTR: 2000-1000-500/1A

CLASS: PS

3 3 3

CORE-4

4S4

4S3

4S4

4S4

4S3

4S3

CT MB

IR4 / C411 IY4 / C431 IB4 / C451

VN11 / E171

IN4 / C471

E172 E174

3 3 3 3

3 3

CVT SELECTION BUS-1 CVT / BUS-2 CVT / LINE CVT CORE-2 VA : 100

CLASS: 3P

B/U 67 LV - BACKUP PROTECTION FOR ICT LV P1 P1 P1

LV-CT CTR: 1200 – 800 /1A

3 3 3

CORE-4

4S2

4S2

4S2

4S1

4S1

4S1

CT MB

IR4 / C411 IY4 / C431 IB4 / C451

VR11 / E111

IN4 / C471

VB11 / E151

VY11 / E131

CLASS: PS

VN11 / E171

3 3 3

P2 P2 P2

E172 E174

3

3 3 VOLTAGE

SELECTION BUS-1 PT / BUS-2 PT CORE-2 VA : 100

CLASS: 3P

LBB & BUSBAR PROTECTION SCHEMES ADOPTED IN ONE AND HALF CIRCUIT BREAKER SCHEME PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

LBB/BFR PROTECTION LINE1 BUS-1

AT/F-1 1-52CB

2-52CB

50Z

3-52CB

50ZT

BUS-2

50Z

LBB/BFR IS LOCAL BREAKER BACKUP PROTECTION/ BREAKER FAILURE RELAY. 1No LBB RELAY IS PROVIDED FOR EACH BREAKER. LBB IS CURRENT OPERATED RELAY. LBB RELAY IS ENERGISED WHEN MASTER TRIP RELAY(86-A OR/AND 86-B OR/AND 96) OPERATES OR SINGLE PHASE TRIP RELAYS OPERATES AND GIVEN SIGNAL TO BREAKER FOR TRIP. LBB RELAY TIME DELAY IS PROVIDED. LBB RELAY OPERATES WHEN THE BREAKER IS UNDER TROUBLE/ FAILS TO OPERATE. AFTER ENERGISED THE LBB RELAY AND TIME DELAY COMPLETES, EVEN CURRENT IS THERE THIS THINKS BREAKER FAIL TO OPERATE AND GIVEN SIGNAL AS PER SCHEME DESCRIBED NEXT PRESENTATION.

NEW CONCEPT: Normally the CT connections for LBB/BFR relay is in series with Main-2 Protection. In case of Numerical Distributed LBB/BFR and Centralized Bus-Bar System, the CT connections for Bus-Bar are terminated at LBB/BFR and Centralized Bus-Bar is interconnected by Fiber-Optic cable.

1-52 CB LBB/BFR OPERATION

LINE 21L2/ ICT 87T2

86 86--A 86 86--B

86 86--B

86 86--A

LINE 21L1/ ICT 87T1

50Z

DIRECT TRIP 1&2 VIA CARRIER TO OTHER END BUSBAR-1 PROTECTION (96-BB ) OPTD AND BUSBAR-1 ISOLATED

TO 96-ZT TRIP RELAY OF TIE CB(2-52CB)

1-52CB TC-1

TC-2

2-52CB TC-2 TC-1

BUS-1

Breaker Failure Relay of the Main Circuit Breaker Trips the 1. Connected Bus Bar Protection, 2. Tie Circuit Breaker 96/50Z Relay & 3. Remote End Circuit Breaker through Carrier Tripping.

3-52CB BUS-2

2-52 CB LBB/BFR OPERATION LINE 21L1/ ICT 87T1

86 86--A

LINE 21L1/ ICT 87T1

86 86--B

LINE 21L2/ ICT 87T2

50ZT

LINE 21L2/ ICT 87T2

DIRECT TRIP 1&2 VIA CARRIER TO OTHER END

INTER TRIP TO LVCB & TBCCB

TO 96-BB TRIP RELAY OF AT/F(ICT) CB (3-52CB)

TO 96-BB TRIP RELAY OF LINE CB(1-52CB)

2-52CB

1-52CB TC-1

3-52CB TC-2

BUS-1

Breaker Failure Relay of the Tie Circuit Breaker Trips the 1. Both Sides Main Circuit Breakers and 2. Remote End Circuit Breakers through carrier Tripping ( In case of Transformer, LV Circuit Breaker)

BUS-2

3-52 CB LBB/BFR OPERATION

LINE 21L2/ ICT 87T2

86 86--A 86 86--B

86 86--B

86 86--A

LINE 21L1/ ICT 87T1

50Z INTER TRIP TO LV CB & TBC CB BUSBAR-2 (96 BB) PROTECTION OPTD AND BUSBAR-2 ISOLATED

TO 96-ZT TRIP RELAY OF TIE CB(2-52CB)

2-52CB

1-52CB TC-1

3-52CB TC-2

TC-2

TC-1

BUS-1

Breaker Failure Relay of the Main Circuit Breaker Trips the 1. Connected Bus Bar Protection 2. Tie Circuit Breaker 96/50Z Relay & 3. Remote End Circuit Breaker ( In case of ICT, LV CB)

BUS-2

BASICS OF BUSBAR PROTECTION NEED FOR BUSBAR PROTECTION IN ITS ABSENCE FAULT CLEARING TAKES PLACE IN ZONE-2 OF DISTANCE RELAY BY REMOTE END TRIPPING. THIS MEANS SLOW AND UNSELECTIVE TRIPPING AND WIDE SPREAD BLACKOUT.

EFFECT OF DELAYED CLEARENCE GREATER DAMAGE AT FAULT POINT. INDIRECT SHOCK TO CONNECTED EQUIPMENT LIKE SHAFTS OF GENERATOR AND WINDINGS OF TRANSFORMER.

BASIC THEORY KIRCHOFF’s CURRENT LAW STATES THAT THE SUM OF THE CURRENTS ENTERING A GIVEN NODE MUST BE EQUAL TO THE CURRENTS LEAVING AT THAT NODE.

BUS BAR PROTECTION SYSTEMS 1. 2. 3. 4.

HIGH IMPEDENCE DIFFERENTIAL PROTECTION MODERATE-IMPEDENCE DIFFERENTIAL PROTECTION LOW-IMPEDENCE DIFFERENTIAL PROTECTION NUMERICAL BUS DIFFERENTIAL PROTECTION

HIGH IMPEDENCE DIFFERENCIAL PROTECTION THE HIGH IMPEDENCE PROTECTION SCHEME, ON THE OTHER HAND, IS A GOOD SOLUTION FOR SINGLE BUSBAR ARRANGEMENTS , ONE & HALF BREAKER SYSTEMS OR RING BUSBARS, PROVIDING THAT APPROPRIATE DEDICATED CT CORES ARE AVAILABLE FOR THIS USE ALONE. IT IS SENSTIVE, STABLE & FAST PROTECTION. HOWEVER, SPECIAL CT REQUIREMENTS, ADDITIONAL HIGH VOLTAGE DEVICE PROTECTION, DEMANDING MAINTANENCE etc PUT RESTRICTIONS IN ITS APPLICATIONS. A MEASURING CIRCUIT COMPRISES A HIGH-IMPEDENCE STABILIZING RESISTOR CONNECTED ACROSS THE CIRCULATING CURRENT ARRANGEMENT OF ALL THE CTs IN PARALLEL. THE VALUE OF THE STABILIZING RESISTOR IS CHOOSEN SUCH THAT THE VOLTAGE DROP ACROSS THE RELAY CIRCUIT IS INSUFFICIENT TO OPERATE THE FAULTS OUTSIDE THE PROTECTED ZONE.

LIMITATIONS OF CONVENTIONAL HIGH IMPEDENCE DIFFERENTIAL RELAY PUTS STRINGENT REQUIREMENTS ON CT’s. Class X for all CT Cores. NEED FOR DEDICATED CT CORES. Separate CT Cores for BUSBAR and CHECK ZONE Protection. IDENTICAL CT RATIO, MAGNETISING IMPEDENCE. AUX CT’s RATIO CORRECTIONS UNACCEPTABLE. IN ABILITY TO COPE WITH INCREASING FAULT CURRENT. SLOW RESPONSE. Advantage of Numerical Protection Technology (e.g. Fault recording, Communication etc) not available. BASIC OPERATING TIME EXCLUDING RELAY TIME IS 15 – 20ms. THIS RELAY REQUIRES CHECK ZONE FEATURE. THE TRIP COMMAND IS ONLY GIVEN WHEN BOTH A DISCRIMINATING & CHECK ZONE SYSTEM OPERATES.

MEDIUM IMPEDENCE DIFFERENTIAL PROTECTION MANY OF THE LIMITATIONS OF HIGH IMPEDENCE PROTECTION CAN BE OVERCOME USING MODERATE MEDIUM IMPEDENCE PROTECTION (OR STABILIZED HIGH-IMP SCHEME), WHICH IS A COMBINATION OF THE NORMAL HIGH-IMP AND STABILIZED DIFFERENTIAL SCHEMES.

LOW IMPEDENCE DIFFERENTIAL PROTECTION LOW IMPEDENCE PROTECTION(PERCENTAGE BIASED BUS DIFFERENTIAL RELAY) IS MOST SUITABLE PROTECTION SCHEME FOR DOUBLE AND MULTIPLE BUSBAR SYSTEMS (WITH OR WITHOUT TRANSFER BUS) WITH FEEDERS BEING SWITCHED BETWEEN SECTIONS OF BUSBAR, WHICH OPERATES WITH FULL SELECTIVITY FOR ALL POSSIBLE BUSBAR CONFIGUARATIONS.

ADVANTAGES

FREE OF ANY NEED FOR MATCHED CT CHARACTERESTICS OR RATIOs, LOW LEAKAGE REACTANCE OR RESISTANCE. OTHER PROTECTIVE RELAYS CAN BE INCLUDED IN THE SAME CIRCUIT. STABLE FOR INFINITE FAULT LEVELS. INSENSITIVE TO CT SATURATION. DETECTS FAULTS WITHIN 1 – 2ms & INITIATES TRIPPING WITHIN 5 – 7ms.

DIFFERENCE BETWEEN BUSBAR SCHEMES HIGH IMPEDENCE BUSBAR PROTECTION

PERCENTAGE BIASED LOW IMPEDENCE BUS BAR PROTECTION

PRINCIPLE

THE CURRENTS ENTERING AND LEAVING THE BUSBAR ARE COMPARED CONTINUOSLY.. IT INVOLVES CHOOSING OF IMPEDENCE HIGH ENOUGH CONTINUOSLY STABLISE THE RELAY FOR HEAVY EXTERNAL FAULTS FAULTS.. THIS IS CIRCULATING CURRENT PRINCIPLE PRINCIPLE..

IT HAS DIFFERENTIAL AND BIAS SETTING. SETTING. THE RESULTANT BIAS IS PROPOTIONAL TO ARITHMATIC SUM OF ALL CURRENTS, WHEREAS THE OPERATING CURRENT IS VECTOR SUM OF ALL CIRCUIT CURRENTS CURRENTS..

CTs

IT REQUIRES ALL IDENTICAL CT RATIO’s & TURNS RATIO RATIO.. LOW IT CAN WORK WITH CTs OF UNEQUAL RATIOS ALSO ALSO.. FREE OF RESISTANCE OF SECONDARY WINDING. WINDING. Class X for all CT Cores. Cores. ANY NEED OF MATCHED CT CHARACTERESTIC OR RATIOs LOW MINIMUM KNEE POINT VOLTAGE OF 300300-500V 500V. LEAKAGE REACTANCE OR RESISTANCE. RESISTANCE. OTHER PROTECTIVE LOW MAGNETISING CURRENT(FEW MILLIAMPS) MILLIAMPS).. RELAYS CAN BE INCLUDED IN THE SAME CIRCUIT. CIRCUIT.

BURDEN

IMPOSES COMPARATIVELY HIGH BURDEN ON CTs. CTs. AUXILIARY CTs IMPOSES LESS BURDEN ON CTs. CTs. AUXILIARY CTs HAVE NO REDUCE THE PERFORMANCE OF THE SCHEME EFFECT ON PERFORMANCE OF SCHEME. SCHEME.

CT SATURATION

OPERATION OF SCHEME EVEN WHEN CTs GET SATURATED DURING OPERATION OF SCHEME EVEN WHEN CTs GET SATURATED INTERNAL FAULTS. FAULTS. DURING INTERNAL FAULTS. FAULTS. INSENSITIVE TO CT SATURATION SATURATION..

UTILISATION

IT IS GOOD SOLUTION FOR SINGLE BUSBAR ARRANGEMENTS, ONE & MOST SUITABLE FOR DOUBLE AND MULTIPLE BUSBAR SYSTEMS HALF BREAKER SYSTEMS OR RING BUSBAR SYSTEMS. SYSTEMS. ( WITH OR WITHOUT TRANSFER BUS). BUS).

OPERATING TIME

BASIC OPERATING TIME EXCLUDING RELAY TIME IS 15 – 20 mS mS..

DETECTS FAULTS WITH IN 1 –2 mS AND INITIATES TRIPPING WITH IN 5-7 mS mS..

STABILITY

INABILITY TO COPE WITH INCREASING FAULT CURRENT CURRENT..

STABLE FOR INFINITE FAULT LEVEL LEVEL..

PERFORMANCE

HIGHLY SENSITIVE FOR INTERNAL FAULTS AND COMPLETELY STABLE HIGHLY SENSITIVE FOR INTERNAL FAULTS AND COMPLETELY FOR EXTERNAL FAULTS FAULTS.. STABLE FOR EXTERNAL FAULTS FAULTS..

ADDITIONAL PROTECTION

THIS RELAY REQUIRES CHECK ZONE FEATURE FEATURE.. THE TRIP COMMAND IS THIS RELAY HAS IN BUILT CHECK ZONE FEATURE (NO SEPARATE ONLY GIVEN WHEN BOTH A DISCRIMINATING & CHECK ZONE SYSTEM CHECKZONE FEATURE) i.e OVER CURRENT STARTING RELAY OPERATES.. OPERATES PROVIDED.. PROVIDED

DETAILS

BUS BAR MAINMAIN-1 & MAINMAIN-2 PROTECTION (ANY CT METHOD) P2 P2 P2 CT MB

1-CT CTR: 2000-1000/1A

IN1 / B171

3 3 3

CORE-1

BUS BAR PROTECTION FOR BUS-1

1S3

1S3

1S3

1S1

1S1

1S1

IB1 / B151

CLASS: PS

IY1 / B131 IR1 / B111

MAINCB LBB IS PART OF BUSBAR PROTECTION CT MB IR1 / B111 IY1 / B131 3-CT CTR: 2000-1000/1A

3 3 3

CORE-1

IB1 / B151 1S1

1S1

1S1

1S3

1S3

1S3

IN1 / B171

CLASS: PS

P2 P2 P2

BUS BAR PROTECTION FOR BUS-2

ONE AND HALF CB SYSTEM – HIGH IMPEDANCE 87BB1--MAIN1 BB1 PROTECTION 87BB1

87BB1--MAIN2 BB1 PROTECTION 87BB1

19--52 20-52 21-52

16--52 17-52 18-52

13--52 14-52 15-52

11-52 12-52

10--52

8-52 9-52

7-52 52

5-52 6-52

4-52 52

2-52 3-52

1-52 52

BUS-1

BUS-2



87 – BB2

BUS-2

BUS BARBAR-2 PROTECTION 21-52

18-52

15-52

21-CT CT

18-CT CT

15-CT CT

12-CT CT

9-CT CT

6-CT CT

3-CT CT

20-52

17-52

14-52

11-52

8-52

5-52

2-52

19-CT

16-CT

13-CT

10-CT

7-CT

4-CT

1-CT

19--52

16--52

13--52

10--52

7-52 52

4-52 52

1-52 52

87 – BB1

12-52

9-52

6-52

3-52

ONE AND HALF CB SYSTEM – LOW IMPEDANCE BUS BARBAR-1 PROTECTION

BUS-1

NUMERICAL BUSBAR SCHEME INCL LBB/BFR/CBF (DECENTRALISED & CENTRALISED CONCEPTS) DECENTRALISED CONCEPT FO

CENTRALISED CONCEPT

(REB 500) ABB

MAIN CB LBB

(REB 670) ABB

OR

(7 SS 52) SIEMENS

OR

(487B) SEL

FO OR

OR

TIE CB LBB



MAIN CB LBB FO

LBB TO BUSBAR DIGITAL COMMUNICATION

LBB INBUILT FEATURE

LBB INBUILT FEATURE

NUMERICAL BUSBAR SCHEME INCL LBB/BFR/CBF (DECENTRALISED CONCEPTCONCEPT- DUPLICATE ) DECENTRALISED CONCEPT

DECENTRALISED CONCEPT

(REB 500) ABB

FO

(REB 500) ABB

FO MAIN CB LBB

OR

MAIN CB LBB FO

(7 SS 52) SIEMENS

OR (7 SS 52) SIEMENS

TIE CB LBB FO

OR

OR

TIE CB LBB

(MICOM P740) AREVA

(MICOM P740) AREVA

MAIN CB LBB MAIN CB LBB FO FO



NUMERICAL BUSBAR SCHEME INCL LBB/BFR/CBF (CENTRALISED CONCEPT - DUPLICATE) CENTRALISED CONCEPT

(REB 670) ABB

OR

CENTRALISED CONCEPT

(REB 670) ABB

OR (487B) SEL

(487B) SEL


LBB INBUILT FEATURE


LBB INBUILT FEATURE

DISTRIBUTED LBB & NUMERICAL CENTRALISED BUS BAR PROTECTION (REB 500) ABB

(7 SS 52) SIEMENS

(MICOM P740) AREVA

OR

OR

OR

OR

14-52 15-52

13-52 13

11-52

10-52 10

BUS--2 BUS

12-52

7-52 7 8-52 9-52

5-52 6-52

4-52 4

2-52 3-52

1-52 1

BUS--1 BUS

LATEST DEVELOPMENT IN NUMERICAL DISTRIBUTED BUS BAR PROTECTION

ABB

SIEMENS

AREVA


BUSBAR PROTECTION CENTRAL UNIT

c

E


BAY UNIT

1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

REL 316*4

C E


REL531

LINE PROTECTION

C E

21 L1 ABB Network Partner AG

TRANSFORMER PROTECTION

21 L1

21 L2

21 L1

21 L2

C E

1. 2. 3.

DESCRIPTION

21 L2 REL531

4.

87 T2 87 T1 87 T2 87 T1 87 T1 87 T2 IN THIS NO SEPARATE CORE IS REQUIRED FOR EITHER BUSBAR PROTECTION OR LBB / BFR. CENTRALISED BUSBAR IS CONNECTED FROM BAY UNIT OR LBB OR BFR THROUGH FIBRE OPTIC. BAY UNIT / BFR / LBB IS CONNECTED FROM MAIN-1 & MAIN-2 OF LINE PROTECTION OR MAIN & BACKUP PROTECTION OF TRANSFORMER THROUGH FIBRE OPTIC FOR REDUNDANCY TO BAY UNIT. THE CURRENT DATA IS TRANSFERED TO BAY UNIT TO BUSBAR CENTRAL UNIT FROM LINE / TRANSFORMER PROTECTIONS FOR NUMIRICAL ALGORITHAM OF LBB & BUSBAR CENTRAL UNIT AND IT WILL OPERATE FOR INTERNAL FAULTS AND DOES NOT OPERATE FOR THROUGH / EXTERNAL FAULTS.

MISCELENEOUS RELAYS & PROTECTIONS ADOPTED FOR LINE IN ONE AND HALF CIRCUIT BREAKER SCHEME (STUB, TEED AND AUTO RECLOSURE FUNCTIONS) PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

STUB--1/ STUBSTUB STUB-2 PROTECTION BUS-1

LINE-1

1-52CB

2-52CB

STUB-1&2 (BAY 1&2) 1-89L REL 521 REL 316

DISTANCE / ICT RELAYS CONVERTED TO STUB/BUS OVER LOAD RELAYS WHEN LINE ISOLATOR OPENS

3-52CB STUB-3&2 (BAY 3&2) 3-89T

BUS-2

AT/F-1

RET 521 RET 316

WHEN A LINE IS SUPPLIED VIA TWO CIRCUIT BREAKERS IN A ONE & HALF CIRCUIT BREAKER ARRANGEMENT, THE LINE PROTECTION INCLUDES THE AREA BETWEEN THE TWO CT’s. HOWEVER, WHEN THE LINE ISOLATOR IS OPEN THE LINE CVT‘s FOR THE DISTANCE PROTECTION ARE CONNECTED TO THE LINE AND CANNOT PROVIDE THE CORRECT VOLTAGE FOR THE STUB END.(i.e END.(i.e THE AREA BETWEEN THE LINE ISOLATOR AND CT’s) (STUB = DEAD END) TO PROVIDE PROTECTION FOR A FAULT IN THIS AREA, REL 521/ REL 316 IS PROVIDED WITH A STUB PROTECTION WHICH GIVES AN BUS OVER CURRENT TRIP IF THE LINE ISOLATOR IS OPEN AND THE CURRENT EXCEEDS THE SET VALUE IN ANY PHASE.

STUB--1 (BAY 1&2 OR BAY 3&2) STUB OPERATES

STUB--2 (BAY 1&2 OR BAY 3&2) STUB OPERATES

IT OPERATES THE 33-PH TRIP GR GR--A MAIN CB (1(1--52CB OR 33--52CB) AND 33-PH TRIP GR GR--A TIE CB (2 (2--52CB) IT OPERATES THE 33-PH TRIP GR GR--B MAIN CB (1(1--52CB OR 33--52CB) AND 33-PH TRIP GR GR--B TIE CB (2 (2--52CB)

TEED--1/ TEEDTEED TEED-2 PROTECTION BUS-1

1-52CB TEED-1&2 (BAY 1&2)

2-52CB

3-52CB

BUS-2

TEED-1&2 (BAY 2&3)

LINE-1 AT/F-1 TEED PROTECTION IS BASED ON KIRCHOFF’S CURRENT LAW. THREE SETS OF CTS ARE CONNECTED IN STAR FASHION. SOME OF THE CURRENTS MUST BE ZERO. IF ANY UNBALANCE CURRENTS ARE NOTICED THEN IMMEDIATELY TEED PROTECTION OPERATES. IF TEED PROTECTION BAY 1&2 OPERATED THEN IT TRIPS 11-52CB & 2 2--52CB. SIMILARLY IF TEED PROTECTION BAY 2&3 OPERATED THEN IT TRIPS 22-52CB & 3 3--52CB.

TEED-1 TEEDPROTECTION

SUMMATION OF INDIVIDUAL PHASES OF TT-SHAPED 3 CTs BEFORE REACHING TO RELAY. THIS IS CIRCULATING CURRENT PRINCIPLE. THE CURRENT FLOWING THROUGH IS ZERO DURING BALANCED CONDITION. HIGH IMPENDENCE THREE PHASE DIFFERENTIAL RELAY IS USED AS TEEDTEED-1 PROTECTION.

TEED-2 TEEDPROTECTION

T- SHAPED 3 CTs ARE CONNECTED TO RELAY. THE RELAY HAVING OPERATING COIL & RESTAIRING COIL. BASED ON THE DIFFERENTIAL CURRENT FLOWING THROUGH THE OPERATING COIL THE RELAY OPERATES. LOW IMPEDENCE PERCENTAGE BIASED THREE TERMINAL THREE PHASE DIFFERENTIAL RELAY IS USED AS TEEDTEED-2 PROTECTION.

TEED--1 PROTECTION TEED P2 P2 P2

IR5 IY5 IB5

1-CT CTR: 2000-1000-500/1A

3 3 3

CORE-5

{BAY1&2} (5/6/8 CT METHOD)

5S4

5S4

5S4

5S2

5S2

5S2

CLASS: PS

87 TEED-1

IN5 P1 P1 P1 P2 P2 P2

IR5 IY5 IB5

2-CT CTR: 2000-1000-500/1A

3 3 3

CORE-5

5S4

5S4

5S4

5S2

5S2

5S2

CLASS: PS

IN5 P1 P1 P1 P2 P2 P2

IT WORKS ON CIRCULATING CURRENT PRINCIPLE AND IT IS HIGH IMPEDENCE DIFFERENTIAL RELAY. TEED-1 PROTECTION FOR BAY 2&3 IS ALSO SAME AS ABOVE AND THE FOLLOWING CTs & CORES ARE USED 3-CT(CORE-5), 2-CT(CORE-1) & 3-TCT(CORE-1) ARE STARRED AND CONNECTED TO TEED-1 PROTECTION

1-LCT

IN1

CORE-1 CLASS: PS

1S3

1S3

1S3

1S2

1S2

1S2

3 3 3

CTR: 2000-1000/1A

IB1 IY1 IR1 P1 P1 P1

5 CT METHOD : 1-CT, 2-CT & 1L-CT 6 CT METHOD : 1-CT, 2-BCT & 1L-CT 8 CT METHOD : 1-ACT, 2-BCT & 1L-CT

TEED--2 PROTECTION TEED {BAY1&2} (5/6/8 CT METHOD) P2 P2 P2

CT MB CT MB

P2 P2 P2

87 TEED-2 1-CT CTR: 2000-1000-500/1A

3 3 3

CORE-4

4S4

4S4

4S4

4S2

4S2

4S2

CLASS: PS

4S4

4S4

4S4

4S2

4S2

4S2

3 3 3

2-CT CORE-4 CTR: 2000-1000-500/1A

P2 P2 P2 CT MB 1-LCT CORE-2 CLASS: PS

3 3 3

CTR: 2000-1000/1A

2S3

2S3

2S3

2S2

2S2

2S2

CLASS: PS

TEED-2 PROTECTION FOR BAY 2&3 IS ALSO SAME AS ABOVE AND THE FOLLOWING CTs & CORES ARE USED. 3-CT(CORE-4), 2-CT(CORE-2) & 3-TCT (CORE-2) ARE CONNECTED TO TEED-2 PROTECTION. IT WORKS ON KIRCHOFF’S CURRENT PRINCIPLE & IT IS PERCENTAGE BIASED LOW IMPEDENCE DIFFERENTIAL RELAY

TEED / STUB PROTECTION TRIP SCHEME ABB Network Partner AG

1 2 3 4 5 6 7 8

REC 316*4

9 10 11 12 13 14 15 16

C E

86 86--A MTR/ HSTR

TRIP COIL-1 1-52CB TRIP COIL-2

STUB OR TEED-1

(BAY 1&2) (BAY 1&2)

86 86--A MTR/ HSTR

TRIP COIL-1 2-52CB TRIP COIL-2

STUB OR TEED-1

(BAY 2&3) (BAY 2&3)

TEED-2 OR STUB

86 86--B MTR/ HSTR

TRIP COIL-1 3-52CB TRIP COIL-2 BUS-2

BUS-1 86 86ABB -B REL521 MTR/ MAINMAIN HSTR -1

86 86--A MTR/ HSTR

TEED-2 OR STUB

86 86--B MTR/ HSTR

86 86--A : GROUPGROUP-A MASTER TRIP RELAY / HIGH SPEED TRIP RELAY 86 86--B : GROUPGROUP-B MASTER TRIP RELAY / HIGH SPEED TRIP RELAY LINE/TRANSFORMER ISOLATOR OPENS THIS INTERLOCK WILL INITIATE 21 L1 / 87 T1 & 21 L2 / 87 T2 CONVERTED STUB STUB--1 & 2 PROTECTION

AUTO RECLOSURE BASICS FAULTS ARE THREE TYPES 1. TRANSIENT FAULT: These are cleared by the immediate tripping of Circuit Breakers and do not reoccur when the line is re-energized. 2. SEMI-PERMANENT FAULTS: These require a time interval to disappear before a line is charged again. 3. PERMANENT FAULTS: These are to be located and repaired before the line is re-energized. About 80-90% of the faults occurring are transient in nature. Hence the Automatic Reclosure of breaker (after tripping on Fault) will result in the line being successfully re-energized. ADVANTAGES: A. Decreasing outage time. B. Improving Reliability. C. Improving system stability. D. Reduce fault damage and Maintenance Time. DEAD TIME: The time between the Auto-reclosing Scheme being energized and the operation of the contacts which energize the Circuit Breaker closing circuit. RECLAIM TIME: The Time Following a successful closing operation measured from the instant the Auto-Reclosing relay closing contacts make which must elapse before the Auto-Reclosing relay initiates another reclosing attempt. In other words, it may be said to be the time between 1st and 2nd Auto-Reclosure.

TYPES OF AUTO-RECLOSING SCHEMES: 1. BASED ON PHASE A. THREE PHASE AUTO-RECLOSING: This type of Auto-Reclosing causes an immediate drift part of the two systems and hence no interchange of synchronizing power can take place during the dead time. B. SINGLE PHASE AUTO-RECLOSING: In this, only the faulty phase(only SLG Faults) is reclosed without causing interruption in interchange synchronizing power between two systems through other two healthy phases. 2. BASED ON ATTEMPTS OF RECLOSURE A. SINGLE SHOT AUTO-RECLOSING: In this scheme, Breaker is reclosed only once on a given fault before lockout of Circuit Breaker Occurs. High-Speed Auto-Reclosing for EHT System is invariably Single Shot. B. MULTI-SHOT AUTO-RECLOSING: In this scheme, more than one reclosing attempts made for a given fault before lockout of Circuit Breaker occurs. B.I. DISADVANTAGES: Repeated closure attempts has with high fault level would seriously affect the Circuit Breaker, Equipment and System Stability. B.ii. CIRCUIT BREAKER LIMITATIONS: Ability of Circuit Breaker to Perform several Trip Close operations in quick succession. B. iii. SYSTEM CONDITIONS: In the percentage of the semi-Permanent faults (which could be burnt out) is moderate, For example on the lines through the forest, multi shot Auto-Reclosing is followed. 3. DEPENDING ON SPEED: A. HIGH-SPEED AUTO-RECLOSING: This aids in fast restoration of supply but should be done by taking into account the following factors. I. System disturbance time can be tolerated without loss of system stability. ii. Characteristics of Protection Schemes and Circuit Breaker. B. LOW SPEED OR DELAYED AUTO RECLOSING: This is suitable for highly interconnected systems where the loss of a single line is unlikely to cause two sections of the system to drift apart and loose synchronism.

METHOD OF ADOPTION IN ONE AND HALF BREAKER SYSTEM: The Auto-Reclosure Functions used for the Bus Breakers 1-52CB & 3-52CB are set as Masters and one for the Center Breaker 2-52CB(TIE) as Follower. Co-ordination is required between the Auto-Reclosure Functions. A Synchrocheck function is also loaded in each Relay to permit 3 pole Auto-Reclosing. Each Line Protection relays starts both MAIN & TIE Circuit Breakers to trip for the Concerned line. After a Successful reclosure of the Main Breaker, The Tie Breaker will be reclosed after a supplementary time delay. Should the Main CB AutoReclosure relay not be successful in its reclosing attempts, the Tie CB AutoReclosure is blocked. If the Main CB is Open or its Auto-Reclosure Relay is not ready or Out of service, The TIE CB Auto-Reclosure will reclose The TIE Breaker after its own dead time without any supplementary time delay. CHOICES OF EHV SYSTEM: 1. CHOICE OF DEAD TIME: A. Lower limit is decided by deionising of Circuit Breaker. B. Upper Limit is decided by Transient Stability and Synchronism. C. Longer Transmission Lines Require Longer dead Time. D. The dead time for High Speed Auto-Reclosing scheme with EHV System is 0.3 to 1.2 sec. 2. CHOICE OF RECLAIM TIME: This should not be set to such a low value that the operating cycle of Breaker is exceeded when two faults incident occurs close together. The reclaim time will be in the range of 10 to 30 sec., depending the breaker opening and closing mechanisms. 3. CHOICE OF ZONE: This should normally kept in Zone-1. It is a Zone-1 fault and SLG fault only autoreclosure is comes in to picture. In other zones the auto reclosure is blocked.

AUTO-RECLOSURE FOR AUTOONE & HALF BREAKER SCHEME TRIP COMMANDS AUTO RECLOSURE COMMANDS

79 (A/R)+ 25(SYNC) RAAAM RASC



1-52CB

2-52CB

3-52CB

ABB Network Partner AG ABB Network Partner AG


LINE-1

1 2 3 4 5 6 7 8

C E

21 MAIN-1 REL 521

REL531

REL531

21 MAIN-2 REL 316


REC 316*4

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

REC 316*4

9 10 11 12 13 14 15 16

LINE-2 C

C

E

E

21 MAIN-1 REL 521

C E

21 MAIN-2 REL 316

AUTO RECLOSING TIMING CHART INSTANT OF FAULT OPERATES

RESETS

TRANSIENT FAULT

PROTECTION OPERATING TIME

TRIP COIL CONTACTS ARC CONTACTS ENERGISED SEPARATE EXTINGUISHED FULLY OPEN

CIRCUIT BREAKER OPENING TIME

CLOSING TIME

ARCING TIME

OPERATING TIME OPERATES

RESETS

PROTECTION

PERMANENT FAULT

CLOSING COIL CONTACTS CONTACTS ENERGISED MAKE FULLY CLOSED

OPERATES

RESETS

RECLOSE ON TO FAULT

OPERATING TIME

TRIP COIL CONTACTS ARC CONTACTS ENERGISED SEPARATE EXTINGUISHED FULLY OPEN

CIRCUIT BREAKER

DEAD TIME

OPENING TIME

CLOSING COIL CONTACTS CONTACTS ENERGISED MAKE FULLY CLOSED

CLOSING TIME

ARCING TIME

OPERATING TIME

DEAD TIME

CONTACTS ARC CONTACTS SEPARATE EXTINGUISHED FULLY OPEN

TRIP COIL ENERGISED

SYSTEM DISTURBANCE TIME RECLOSE INITIATED BY PROTECTION

RELAY READY TO RESPOND TO FURTHER FAULT INCIDENTS (AFTER SUCEESFUL RECLOSRE)

AUTO RECLOSE RELAY DEAD TIME

CLOSING PULSE TIME RECLAIM TIME

TIME

CARRIER INTERTRIPPING SCHEMES ADOPTED IN ONE AND HALF CIRCUIT BREAKER SCHEME PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

TYPES OF CARRIER TRIPPING SCHEMES PERMISSIVE TRIPPING Permissive trip commands are always monitored by a protection relay. The circuit breaker is tripped when receipt of the command coincides with operation of the protection relay at the receiving end responding to a system fault. The receipt of an incorrect signal must coincide with operation of the receiving end protection for a trip operation to take place. Normally, the risk of a spurious trip is lesser. The intention of these schemes is to speed up tripping for faults occurring within the protected zone.

BLOCKING SCHEME Blocking commands are initiated by a protection element that detects faults external to the protected zone. Detection of an external fault at the local end of a protected circuit results in a blocking signal being transmitted to the remote end. At the remote end, receipt of the blocking signal prevents the remote end protection operating if it had detected the external fault. Loss of the communications channel is less serious for this scheme than in others as loss of the channel does not result in a failure to trip when required. However, the risk of a spurious trip is higher.

TYPES OF CARRIER TRIPPING SCHEMES Conventional time-stepped distance protection has One of the main disadvantages is that the instantaneous Zone 1 protection at each end of the protected line cannot be set to cover the whole of the feeder length and is usually set to about 80%. This leaves two 'end zones', each being about 20% of the protected feeder length. Faults in these zones are cleared in Zone 1 time by the protection at one end of the feeder and in Zone 2 time (typically 0.25 to 0.5 seconds) by the protection at the other end of the feeder. This situation cannot be tolerated in some applications, for two main reasons: I). Faults remaining on the feeder for Zone 2 time may cause the system to become unstable. II). Where high-speed auto-reclosing is used, the non-simultaneous opening of the circuit. Breakers at both ends of the faulted section results in no 'dead time' during the autoreclose cycle for the fault to be extinguished and for ionized gases to clear. This results in the possibility that a transient fault will cause permanent lockout of the circuit breakers at each end of the line section. Even where instability does not occur, the increased duration of the disturbance may give rise to power quality problems, and may result in increased plant damage. Unit schemes of protection that compare the conditions at the two ends of the feeder simultaneously positively identify whether the fault is internal or external to the protected section and provide high-speed protection for the whole feeder length. This advantage is balanced by the fact that the unit scheme does not provide the back up protection for adjacent feeders given by a distance scheme. The most desirable scheme is obviously a combination of the best features of both arrangements, that is, instantaneous tripping over the whole feeder length plus back-up protection to adjacent feeders. This can be achieved by interconnecting the distance protection relays at each end of the protected feeder by a communications channel. The purpose of the communications channel is to transmit information about the system conditions from one end of the protected line to the other, including requests to initiate or prevent tripping of the remote circuit breaker. The former arrangement is generally known as a 'transfer tripping scheme' while the latter is generally known as a 'blocking scheme'. However, the terminology of the various schemes varies widely, according to local custom and practice.

TYPES OF CARRIER TRIPPING SCHEMES 1. ZONE 1 EXTENSION SCHEME (Z1 (Z1X SCHEME) 2. TRANSFER TRIPPING SCHEMES I. DIRECT UNDER REACH TRANSFER TRIP SCHEME (DUTT) II. PERMISSIVE UNDER REACH TRANSFER TRIP SCHEME (PUTT) III. PUTT – FWD SCHEME IV. PERMISSIVE UNDER REACH ACCELERATED SCHEME V. PERMISSIVE OVER REACH TRANSFER TRIP SCHEME (POTT) VI. WEEK IN FEED CONDITIONS. 3. BLOCKING OVER REACHING SCHEMES I. BLOCKING OVER-REACHING PROTECTION SCHEME USING ZONE 2. OR DIRECTIONAL COMPARISION BLOCKING SCHEME

II. BLOCKING OVER-REACHING PROTECTION SCHEME USING ZONE 1. III. WEEK IN FEED CONDITIONS. 4. DIRECTIONAL COMPARISON UNBLOCKING SCHEME

PROPERTIES OF COMMAND PROTECTION SYSTEMS OPERATING MODE

UNDER REACHING SENDING

OVER REACHING SENDING

PERMISSIVE CRITERIA RECEIVING

GENERAL REQUIREMENTS

UNDER IMPEDENCE UNDER VOLTAGE OVER CURRENT DISTANE & DIRECTION

SECURE & FAST

PERMISSIVE UNDER REACH (PUTT)

ZONE-1

- - -

PERMISSIVE OVER REACH (POTT)

- - -

ZONE-2

DIRECT TRIP

ZONE-1

- - -

DISTANCE & DIRECTION

DEPENDABLE

ACCELERAT ED UNDER REACH

ZONE-1

- - -

ZONE-2

SECURE & FAST

BLOCKING OVER REACH

- - -

REVERSE LOCKING

DISTANCE & DIRECTION

SECURE & FAST SECURE &

FAST & DEPENDABLE

PREFFERED APPLICATIONS OF TELE/ CARRIER TRIPPING SCHEMES PARAMETERS

Signal Transmission System

PUTT

POTT

Dependable and secure communication channel 1. Power line carrier with frequency shift modulation. HF signal coupled to 2 phases of the protected line, or even better, to a parallel circuit to avoid transmission of the HF signal through the fault location. 2. Microwave radio, especially digital(PCM) 3. Fibre -optic cables

Characteristic Best suited for longer lines - where Of line the Under-reach zone provides sufficient resistance coverage.

1. Excellent coverage On short lines in the Presence of fault resistance. 2. Suitable for the Protection of multiterminal lines with intermediate infeed.

BLOCKING

UNBLOCKING

Reliable communication channel (only required during external faults) 1. Power line carrier With amplitude Modulation (ON/OFF). The same frequency may be used on all terminals) All line types – Preferred practice in the USA.

Dedicated channel With continuous signal Transfer 1. Power line carrier With frequency shift keying. Continuous Signal transmission must be permitted.

Same as POTT

COMPARISION OF TELE/ CARRIER TRIPPING SCHEMES On normal two-terminal lines the main deciding factors in the choice of the type of scheme, apart from the reliability of the signalling channel, operating speed and the method of operation of the system. Table compares the important characteristics of the various types of scheme.

Criterion Speed of operation

Transfer Tripping Scheme Fast

Blocking scheme Not as Fast

Speed with in-service testing Slower

As fast

Suitable for auto Re Close

Yes

Yes

Security against mal-operation due to: Current reversal

Special features required


Loss of communications

Poor

good

Weak In feed/Open CB



Modern digital or numerical distance relays are provided with a choice of several schemes in the same relay. Thus scheme selection is now largely independent of relay selection, and the user is assured that a relay is available with all the required features to cope with changing system conditions.

ADVANTAGES & DRAWBACKS OF TELE/ CARRIER TRIPPING SCHEMES PARAMETERS

PUTT

POTT

ADVANTAGES

1. Simple technique 2. No coordination Of zones and times With the opposite End required. 3.The combination Of different relay Types therefore presents no Problems.

1. Can be applied without Under reaching zone1 stage (e.g. overcompensated Series compensated lines). 2. Can be applied on Extremely short lines (impedance less than minimum relay setting) 3. Better for parallel lines as mutual coupling is not critical for the overreach zone 4. Weak in feed terminals are no problem. (Echo and Weak In feed logic is included)

Same as POTT

1. Overlapping of the zone 1 reaches must be ensured. On parallel lines, teed feeders and tapped lines, the influence of zero sequence coupling and intermediate In feeds must be carefully considered to make sure a minimum overlapping of the zone 1 reach is always present. 2. Not suitable for weak In feed terminals

1. Zone reach and signal timing coordination with the Remote end is necessary (current reversal).

Same as POTT Same as 1. Slow tripping – all POTT Tele-protection trips must be delayed to wait for the eventual blocking signal. 2. Continuous channel Monitoring is not Possible.

DRAWBACKS

BLOCKING

UNBLOCKING Same as POTT but: 1. If no signal is Received (no block and no unblock) then tripping by the overreach zone is released after 20 ms

ADVANTAGES & DRAWBACKS OF TELE/ CARRIER TRIPPING SCHEMES PARAMETERS

Short Line

Weak InInfeed Amplitude Modulated Power Line Carrier Frequency or Phase Modulated Power Line Carrier Communication

independent of Power Line

PUTT

POTT

BLOCKING

UNBLOCKING

Suitable as the Z1B setting may be substantially larger than the Line impedance so that signal Transmission is secure for all faults on the Line. Suitable as the Strong end detects all the Line Faults with the OverReaching Z1B. The Weak In-feed end then echos the received Signal.

Suitable as Reverse Reach Setting is independent of Line Length.

Not Suitable as the Signal must be Transmitted through the Fault Location which Attenuates the Signal.

Not Suitable same as PUTT.

Suitable as the Signal is only sent when the Line is not Faulted.

Not Suitable Same as PUTT.

Suitable as the Signal can be Transmitted through the Fault Location.

Suitable same as PUTT.

Suitable as the Signal can be Transmitted under all Conditions.

Suitable Same as PUTT.

Suitable.

Suitable.

Suitable.

Suitable.

Not Suitable as the Zone1 Operation is essential and Zone1 setting in X and R direction must be small on Short Lines.

Not Suitable as the Zone1 Operation is essential at Both Ends for 100% Coverage.

Suitable Same as POTT.

Partially Suitable Suitable Same as as the Reverse Fault POTT. is also Detected at the Weak In-feed end but no trip at Weak In-feed end.

PROTECTION COUPLER PANEL NSD 50/ NSD 70 ACTIVE

START

TRIP

5

6

ALARM-1 ALARM250V DC

1C S

2+ 5C R

6+

1-

TX TRIP A(C)

RX TRIP A(C)

C S

2+ 5C R

6+

TX TRIP C(A)

RX TRIP C(A)

C

7

8

ALARM-2 ALARM250V DC

DISPLAY

E

C S

910 10+

C R

13 13-14+

G4AA TB: V9LB

9-

TX TRIP B(D)

RX TRIP B(D)

G4AC TB: V9LC

C S

10+ 13 13-C R

14+

TX TRIP D(B)

RX TRIP D(B)

GA4D TB:V9LC

PROTECTION COUPLERS FOR 400KV LINE

FOR EACH LINE 2Nos PROTECTION COUPLER PANELS PROVIDED. FOR EACH LINE 1NO CARRIER SPEECH PANEL PROVIDED. SO, ONE LINE REQUIRES TOTAL 3 PANELS. CARRIER SPEECH PANEL PURELY FOR VOICE COMMUNICATION BETWEEN TWO SUBSTATIONS, i.e THE LINE CONNECTED SUBSTATIONS. THE VOICE COMMUNICATION ARE TWO METHODS PROVIDED. ONE IS HOTLINE COMMUNICATION/DEDICATED/ LIFT&TALK METHOD. ANOTHER IS DIAL METHOD. IN PROTECTION COUPLER PANELPANEL-1 TOTAL 3 CARDS ARE IMPORTANT FOR SENDING & RECEIVING TRIP SIGNALS. ONE CARD FOR ALARM i.e G4AA. ONE CARD FOR PERMISSIVE/PROTECTION TRIP i.e G4AC & ANOTHER CARD FOR DIRECT TRIPS i.e G4AD. IN PROTECTION COUPLERCOUPLER-2 PANEL ALSO 3 CARDS ARE PROVIDED SIMILAR TO PROTECTION COUPLERCOUPLER-1 PANEL. THE PROTECTION COUPLER PANEL DRAWING IS SHOWN IN PREVIOUS MENU. 1SET TX & RX FOR PERMISSIVE/ PROTECTION TRIP(G4AC) 1SET TX & RX FOR BACKUP FOR PERMISSIVE/ PROTECTION IN ANOTHER PANEL(G4AC). 1SET TX & RX FOR DIRECT TRIP CHANNELCHANNEL-1( G4AD). 1SET TX & RX FOR SPARE UNDER EMERGENCY(G4AD). THE ABOVE ARRANGEMENT SIMILAR FOR PROTECTION COUPLER PANELPANEL-2. G4AA CARD FOR ALARM.

NSD 50

MAIN--1 PROTECTION CARRIER INTER TRIPPING MAIN G4AC V9LC 1 G4AC V9LC 6

CARRIER RECEIVE

G4AC V9LC 5

ABB

21L1 CR -VE

CS

G4AC V9LC 2

CARRIER SEND

G4AA V9LB 5 G4AA V9LB 6 PANEL-1

NSD 50

LINE

IN OUT

ALARM

+VE

-VE

G4AC V9LC 10 G4AC V9LC 13 G4AC V9LC 14

ABB

G4AC V9LC 9

PANEL-2

THIS IS BACKUP FOR PERMISSIVE/ PROTECTION TRIP AND CONNECTED IN ANOTHER PANEL

NSD 50

MAIN--2 PROTECTION CARRIER INTER TRIPPING MAIN G4AC V9LC 1 G4AC V9LC 6

CARRIER RECEIVE

G4AC V9LC 5

ABB

21L2 CR -VE

CS

G4AC V9LC 2

CARRIER SEND

G4AA V9LB 5 G4AA V9LB 6 PANEL-2

NSD 50

LINE

IN OUT

ALARM

+VE

-VE

G4AC V9LC 10 G4AC V9LC 13 G4AC V9LC 14

ABB

G4AC V9LC 9

PANEL-1

THIS IS BACKUP FOR PERMISSIVE/ PROTECTION TRIP AND CONNECTED IN ANOTHER PANEL

DIRECT TRIP SEND CARRIER CHANNELCHANNEL-1 96 BUSBAR PROT-2 PANEL 87 BUSBAR TRIP (ZONE-2)

PANEL-1

96 BUSBAR PROT-1 PANEL

ABB NSD 50

87 BUSBAR TRIP (ZONE-1)

DC +VE FROM PANEL

CONTROL PANEL T NC

MAIN CB(1-52CB)

R

Y

B

TIE CB (2-52 CB)

T NC

TIE CB(2-52CB)

R

Y

B

MAIN CB (1-52 CB)

G4AD V9LC 2 G4AD V9LC 1

50 LBB/BFR FOR MAIN CB / RAICA 59L1 / OVER VOLTAGE STAGE-1 59L2 / OVER VOLTAGE STAGE-2 87 HZ / TEED-1 PROTECTION 87 LZ / TEED-2 PROTECTION 50 LBB/BFR FOR TIE CB / RAICA

DC –VE FROM PANEL CONDITIONS FOR DIRECT TRIP 1. TIE CB OPEN CONDITION + MAIN CB REMOTE HAND TRIP GIVEN. 2. MAIN CB OPEN CONDITION + TIE CB REMOTE HAND TRIP GIVEN. 3. TIE CB OPEN CONDITION + 96 BUSBAR-1 OPERATED. 4. MAIN CB OPEN CONDITION + 96 BUSBAR-2 OPERATED (FOR HALF DIA ONLY). 5. MAIN CB 50 LBB/BFR OPERATED. 6. TIE CB 50 LBB/BFR OPERATED. 7. 59L1 OVER VOLTAGE STAGE-1 OPERATED. 8. 59L2 OVER VOLTAGE STAGE-2 OPERATED. 9. 87 HZ TEED-1 PROTECTION OPERATED 10. 87 LZ TEED-2 PROTECTION OPERATED.

DIRECT TRIP SEND CARRIER CHANNELCHANNEL- 2 96 BUSBAR PROT-2 PANEL

PANEL-2

87 BUSBAR TRIP (ZONE-2)

ABB NSD 50

96 BUSBAR PROT-1 PANEL 87 BUSBAR TRIP (ZONE-1)

DC +VE FROM PANEL

CONTROL PANEL T NC

MAIN CB(1-52CB)

R

Y

B

TIE CB (2-52 CB)

T NC

TIE CB(2-52CB)

R

Y

B

MAIN CB (1-52 CB)


50 LBB/BFR FOR MAIN CB / RAICA 59L1 / OVER VOLTAGE STAGE-1 59L2 / OVER VOLTAGE STAGE-2 87 HZ / TEED-1 PROTECTION 87 LZ / TEED-2 PROTECTION 50 LBB/BFR FOR TIE CB / RAICA

DC –VE FROM PANEL CONDITIONS FOR DIRECT TRIP 1. TIE CB OPEN CONDITION + MAIN CB REMOTE HAND TRIP GIVEN. 2. MAIN CB OPEN CONDITION + TIE CB REMOTE HAND TRIP GIVEN. 3. TIE CB OPEN CONDITION + 96 BUSBAR-1 OPERATED. 4. MAIN CB OPEN CONDITION + 96 BUSBAR-2 OPERATED (FOR HALF DIA ONLY). 5. MAIN CB 50 LBB/BFR OPERATED. 6. TIE CB 50 LBB/BFR OPERATED. 7. 59L1 OVER VOLTAGE STAGE-1 OPERATED. 8. 59L2 OVER VOLTAGE STAGE-2 OPERATED. 9. 87 HZ TEED-1 PROTECTION OPERATED 10. 87 LZ TEED-2 PROTECTION OPERATED.

DIRECT TRIP RECEIVE CHANNELCHANNEL-1&2 PANEL-1

ABB NSD 50

TO 8686-A MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR MAIN CB(152CB)

DC +VE

TO 8686-A MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR TIE CB(252CB)

G4AD V9LC 6 G4AD V9LC 5 PANEL-2

DIRECT TRIP-1 CARRIER RECEIVE RELAY

+VE

-VE

ABB NSD 50

TO 8686-B MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR MAIN CB(152CB)

DC +VE

TO 8686-B MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR TIE CB(252CB)


DIRECT TRIP-2 CARRIER RECEIVE RELAY

PLCC CARRIER PROTECTION SYSTEM (TELEPROTECTION) ABB Network Partner AG

REL531


REL531

REL 521 MAIN-1 PROTECTION C

C

E

E

ELECTRICAL CONNECTION NSD 50 PANEL

NSD 50 PANEL PLCC PANEL

ELECTRICAL POWER LINE

PLCC PANEL NSD 50 PANEL

NSD 50 PANEL ELECTRICAL CONNECTION ABB Network Partner AG

1

9

2 3 4

10 11 12

5 6

13 14

7 8

15 16

REC 316*4


C

E

REL 316 MAIN-2 PROTECTION

1

9

2 3 4

10 11 12

5 6

13 14

7 8

15 16

REC 316*4

C

E

FIBRE OPTIC PROTECTION SYSTEM (TELEPROTECTION) ABB Network Partner AG

REL531


REL531

REL 521 MAIN-1 PROTECTION C

C

E

E

ELECTRICAL CONNECTION

TUNOS

TUNOS

FOX-U FOX-515

FOX-U FOX-515

GECOD/ SIFOX

NSD 70 PANEL

NSD 70 PANEL GECOD/ SIFOX

NSD 70 PANEL

NSD 70 PANEL

ELECTRICAL CONNECTION ABB Network Partner AG

1

9

2 3 4

10 11 12

5 6

13 14

7 8

15 16

REC 316*4


C

E


1

9

2 3 4

10 11 12

5 6

13 14

7 8

15 16

REC 316*4

C

E

FIBRE OPTIC CARRIER PROTECTION SYSTEM (TELEPROTECTION) DIGITAL RELAY CONNECTION VIA FIBRE OPTIC ABB Network Partner AG

REL531


REL531



1

9

2 3 4

10 11 12

5 6

13 14

7 8

15 16

FOX-U FOX-515

REC 316*4


C

E


1

9

2 3 4

10 11 12

5 6

13 14

7 8

15 16

OTERM

E

TUNOS

C

E

TUNOS

OTERM

FOX-U FOX-515

C

REC 316*4

C

E

FIBRE OPTIC CARRIER PROTECTION SYSTEM (TELEPROTECTION) DIGITAL RELAY CONNECTION VIA FIBRE OPTIC Tx

Rx

Tx Rx

OPTIMUX

MAIN-2 LINE PROTECTION 21L2 /87L2

NMS

Rx Tx

PROTN COUPLER

NMS

Tx

MAIN-1 LINE PROTECTION 21L1 /87L1

OPTIMUX

PROTN COUPLER

Rx

MISCELLENEOUS RELAYS & PROTECTIONS ADOPTED FOR AUTO TRANSFORMER IN ONE AND HALF CIRCUIT BREAKER SCHEME (OVER FLUX & REF FUNCTIONS)


OVER EXCITATION/FLUX RELAY {FOR AUTO TRANSFORMER HV & LV} VOLTAGE SELECTION

99 T HV

BUS-1 PT / BUS-2 PT CORE-1 VA : 100

CLASS: 3P

HV OVER FLUX RELAY IS IN BUILT FUNCTION OF MAIN1: 87T1: DIFF PROTN LV OVER FLUX RELAY IS IN BUILT FUNCTION OF MAIN2: 87T2: DIFF PROTN CVT SELECTION BUS-1 CVT / BUS-2 CVT / LINE CVT CORE-1 VA : 100

CLASS: 3P

99 T LV

315MVA, 400KV/220KV AT/F VOLAGE SELECTION BUS-1

LINE1

1-52CB

2-52CB

3-52CB

BUS-2

AT/F-1

FEEDER HAVING LINE CVTs &BUSES ARE HAVING BUS CVTs BUT AT/Fs ARE NOT HAVING CVTs. FOR TRANSFORMER PANEL, PT SUPPLY IS SELECTED AS PER SELECTION DESCRIBED BELOW FOR METERING AND PROTECTION, WHICH IS FIRST SELECTED .

BUS-1 BUSCVT BUS--2 BUS CVT LINE CVT

If AT/F is feeding from BusBus-1 and 11--52CB & 22--52CB is closed. Then Bus--1 CVT is selected and this supply is extended to Control & Bus Relay Panels for Auto Transformer. If AT/F is feeding from BusBus-2 and 33--52 CB is closed & 22--52CB is open. Then BusBus-2 CVT is selected and this supply is extended to Control & Relay Panels for Auto Transformer. If AT/F is feeding from Direct Line and 22-52CB is closed & 11-52 CB & 33-52 CB is open and 389T ISO is Closed . Then line CVT is selected and this supply is extended to Control & Relay Panels for Auto Transformer.

1-PH UNITS OF 500 MVA TRANSFORMER ( EACH 167 MVA ) WITH CHANGE OVER FACILITY Y

B

1

2

3

R

Y

B

R

Y

B

5

6

7

R

Y

B

SPARE

R

SPARE

4

MAIN-1 & MAINMAINMAIN-2 PROTECTION FOR SHUNT REACTOR ADOPTED IN ONE AND HALF CIRCUIT BREAKER SCHEME


BASICS OF SHUNT REACTOR 1. TYPES OF REACTORS : A. BASED ON REACTOR CONNECTION i. SHUNT REACTOR. ii. SERIES REACTOR. B. BASED ON REACTOR LOCATION i. BUS REACTOR ii. LINE REACTOR C. BASED ON CONTROL i. 3-PH OIL IMMERSED REACTOR WITH GAPPED IRON CORE. ii. THYRISTOR CONTROLLED REACTOR (STATIC VAR COMPENSATOR) (APTRANSCO UTILISING SHUNT REACTORS FOR BUS & LINE IN 400KV NETWORK) 2. NEED OF SHUNT REACTOR: A. LINE REACTOR SHUNT REACTORS ARE USED IN ORDER TO COMPENSATE FOR THE CAPACITIVE SHUNT REACTANCE OF TRANSMISSION LINES. THE REACTOR IS CONNECTED PARALLEL TO THE LINE. THE LOCATION OF REACTOR IS OUT GOING SIDE OF LINE i.e AFTER CIRCUIT BREAKER. LENGTH OF LINE IS MORE THERE MAY BE VOLTAGE IS RAISING DUE TO FARANTI EFFECT(CAPACITANCE) DURING CHARGING. IN CASE OF ZONE-2 (OPEN JUMPER) FAULT, THE FAULT CLEARED BY REMOTE END IS FAST, BUT THIS END IT WILL TAKE TIME DELAY DUE TO ZONE-2. DURING THIS TIME, VOLTAGE MAY RAISING. SO, LINE REACTOR IS USED FOR CONTROLLING THE SWITCHING OVER VOLTAGES AND SAFEGUARD THE OPERATING EQUIPMENT. NORMALLY IT IS ALWAYS IN SERVICE. NORMALLY BOTH ENDS LINE REACTORS ARE PROVIDED. THE ELECTRICAL INTERLOCK IS PROVIDED THAT IF REACTOR ISOLATOR CLOSSED POSITION ONLY WILL GIVE PERMIT TO CLOSE THE LINE ISOLATOR. SIMILARLY FOR OPENING REACTOR ISOLATOR THE LINE ISOLATOR SHOULD BE IN OPEN POSITION. NEUTRAL REACTOR CONNECTED BETWEEN THE STAR POINT OF EHV SHUNT REACTOR AND THE GROUND, LIMITS THE SECONDARY ARC CURRENT TO A LOW VALUE OF AROUND 10 AMPS TYPICALLY FOR 400KV SYSTEM TO ENSURE COMPLETE DE-IONISATION OF ARC PATH WHEN EHV SYSTEM DEVELOPS A SINGLE LINE TO GROUND FAULT. ARC EXTINCTION DURING LINE SINGLE- PHASE AUTORECLOSE DEAD TIME IS ASSISTED BY THIS NEUTRAL REACTOR.

3.

4.

B. BUS REACTOR THE REACTOR IS CONNECTED PARALLEL TO THE BUS i.e LIKE A FEEDER/LINE. DURING LIGHTLY LOADED CONDITIONS THERE MAY BE POSSIBULITY OF RAISING BUS VOLTAGES. FOR SAFEGUARD THE OPERATING EQUIPMENT BUS REACTORS ARE UTILISING. NORMALLY IT IS NOT IN SERVICE. WHENEVER THE VOLTAGE RAISES TO 4%TO 5% MORE THAN THE RATED VOLTAGE THIS MAY BE KEPT IN SERVICE AND 2% TO 3% LESS THAN THE RATED VOLTAGE THIS MAY BE KEPT OUT OF SERVICE. SELECTION OF REACTOR A. LINE REACTOR NORMALLY LINE REACTORS ARE PROVIDED IF THE LINE IS MORE OR EQUAL TO 250KM. IN APTRANSCO NETWORK MAXIMUM LENTH OF LINE IS 350KM. AS PER SYSTEM STUDIES RECOMANDATIONS IF LINE LENGTH IS 250KM TO 300KM 50MVAR REACTOR IS TO BE USED. IF MORE THAN 300KM 63MVAR REACTOR IS TO BE USED. B. BUS REACTOR NORMALLY BUS REACTORS ARE PROVIDED IF THE SUBSTATION BUS VOLTAGE IS RAISING 5% MORE THAN THE RATED VOLTAGE DURING LIGHTLY LOADED CONDITION. BASED ON THE SYSTEM STUDIES RECOMANDATIONS BUS REACTORS ARE TO BE PROVIDED. CALCULATIONS ARE REQUIRED FOR PROVIDING BUS REACTOR. IN THIS THERE IS NO STANDARDISATION. LOCATION OF REACTORS WITH CAPACITY IN APTRANSCO A. LINE REACTOR 1. 400KV KALAPAKA-KHAMMAM 1 AT BOTH ENDS – 63MVAR 2. 400KV KALAPAKA-KHAMMAM 2 AT BOTH ENDS – 63MVAR B. BUS REACTOR 1. 400KV KALAPAKA SS – 2 X 50 MVAR 2. 400KV NUNNA SS(PGCIL BAYS) – 1 x 63 MVAR

5.

6.

7.

8.

9.

PURPOSE OF SHUNT REACTOR PROTECTION THE PURPOSE OF THE PROTECTION RELAYING IS TO DISCONNECT THE REACTOR AND LIMIT DAMAGE IN CASE OF INTERNAL SHORT CIRCUITS, EARTH FAULTS, INTERTURN FAULTS AND OVER VOLTAGE OR OVER LOAD.THE REACTOR FORMS CERTAIN IMPEDENCE FOR RATED FREQUENCY, AND AS IT IS SHUNT CONNECTED, AS OVER LOAD MAY BE CAUSED BY OVER VOLTAGE OR HARMONICS IN VOLTAGE AND CURRENT. PROTECTION DEVICES INBUILT OR MOUNTED ON REACTOR A. OIL IMMERSED REACTOR USUALLY HAVE A GAS DETECTOR AND OIL SURGE. DETECTOR (BUCHHOLZ ALARAM & TRIP DEVICES), WHICH ARE EXCELLENT FOR DETECTING INTERNAL FAULTS. B. TEMPARATURE MONITORS FOR OIL & WINDING PROVIDE GOOD OVER LOAD PROTECTION. C. PRESSURE RELIEF DEVICE IS PROVIDED TO SAFE GUARD THE REACTOR FROM HIGH PRESURES. REACTOR DIFFERENTIAL PROTECTION IT IS WIDELY USED AS INSTANTANEOUS PROTECTION FOR SHORT CIRCUIT FAULTS WITH IN THE DIFFERENTIAL ZONE. THIS IS TREATED AS MAIN-1 PROT FOR REACTOR. IT CAN BE OF HIGH IMPEDENCE TYPE OR OF A SENSITIVE CURRENT STABILISED TYPE. HIGH IMPEDENCE DIFFERENTIAL PROTECTION RELAYS REQUIRE AN EQUAL CT TURNS RATIO ON THE PHASE AND NEUTRAL SIDE. SENSITIVITY IS 5% OF NOMINAL REACTOR CT CURRENT. BACKBACK-UP PROTECTION A VARIETY OF RELAYS ARE AVAILABLE. A. OVER CURRENT & EARTH FAULT PROTECTION. ( 50, 50N, 51, 51N, 67, 67N - ANY COMBINATION OF THESE) B. UNDER IMPEDENCE / DISTANCE ( Z<)(21R). C. NEUTRAL DISPLACEMENT PROTECTION (Un>). RESTRICTED EARTH FAULT PROTECTION IF, FOR SOME REASON, A SENSITIVE DIFFERENTIAL PROTECTION NOT CHOOSEN A RESTRICTED EARTH FAULT PROTECTION CAN BE UTILISED.

SHUNT REACTOR (BUS & LINE) (ONE AND HALF CIRCUIT BREAKER SYSTEM ) BUS-1

BUS-2

1-89

IL INTER LOCK FACILITY: WHEN 1-89R CLOSES ONLY PERMIT TO CLOSE 1-89L AND 1-89L OPENS ONLY PERMIT TO OPEN 1-89R.

3-89

1-52CB

3-52CB P2

P2

3-CT

1-CT P1

P1

1-89A

3-89A 2-CT

1-89R

.

.

2-89A

2-52CB

P2

2-89B 3-89R

1-89L

UUUU

UUU

1-PH NEUTRAL GROUNDING REACTOR

UUU

IL

LINE SHUNT REACTOR

P1

LINE 1

BUS SHUNT REACTOR

REACTOR BUSHING CT INFORMATION CAPACITY OF 400KV REACTORS : 50, 63, 80, 125 MVAR Sr NO

SHUNT REACTOR ITEM

400KV / LINE SIDE

RATIO

LINE SIDE EARTH SIDE

STAR / NEUTRAL SIDE

CORE-1 CORE -2 CORE-3 CORE-4 CORE-5

1

NGR

CORE-1

CORE-2 CORE -3 CORE-4

2000- 2000200/1 200/1 200/1 1000- 1000- 200/1 WTI 200/1 200/1 500/1 500/1 NEUTRAN BUSHING CT : BEFORE STAR FORMATION IN RYB PHASES 200V

200V

3 RCT IN OHMS 1 OHM

1 OHM

1.0 CL AND 10 – 5 – 10 – 5 BURDEN 1 OHM 2.5 – 2.5 10 VA

4

CLASS OF ACURACY

PS

PS

PS

5

PURPOSE

87 R1 DIFF1

87 R2 DIFF2

21 R IMP

1000500250V

1000500250V

OHM

OHM

PS

PS

FOR 21L2 FOR 21L1 /TEED-2 /TEED-1

MET


VKNEE FOR PS 2 & VA FOR 200V MET

CORE-1

CORE-2

200/1

200/1

200V

200V

200V

200V

1 OHM

1 OHM

1 OHM

1 OHM

PS

PS

PS

PS

87 R1 DIFF1

87 R2 DIFF2

64 R REF2

64 R REF1/2

SHUNT REACTOR PROTECTION ONE & HALF BREAKER SYSTEM

CORES

LINE

BUS

DOUBLE BUS & TRANSFER BUS SYSTEM LINE

BUS

400KV SIDE CORE-1

87R1 – 3Ph, 2Wdg REACTOR DIFFERENTIAL RELAY OF LOW IMPEDANCE TYPE.

CORE-2

87R2 - 3Ph, 3Wdg REACTOR DIFFERENTIAL RELAY OF HIGH IMPEDANCE TYPE.

CORE-3

21R – 3Ph, REACTOR BACKUP IMPEDANCE RELAY OF SUITABLY SHAPED CHARECRESTICS EITHER SINGLE / DOUBLE ZONE TYPE.

CORE-4 CORE-5

21L2

87 TEED-2

21L2

(M_CT + T_CT – R_CT)

(M_CT, T_CT, R_CT)

(M_CT+T_CT – R_CT)

21L1

87 TEED-1

21L1


(M_CT, T_CT, R_CT)


M_CT: Main CT, T_CT: Tie CT, R_CT: Reactor CT

87 BBC/BB-2 87 BBM/BB-1

SHUNT REACTOR PROTECTION CORES

ONE & HALF BREAKER SYSTEM LINE

BUS

DOUBLE BUS & TRANSFER BUS SYSTEM LINE

BUS

STAR / NEUTRAL SIDE CORE-1

METERING OF REACTOR

CORE-2

WINDING TEMPARETURE OF REACTOR

CORE-3

87R2 - 3Ph, 3Wdg REACTOR DIFFERENTIAL RELAY OF HIGH IMPEDANCE TYPE.

CORE-4

87R1 – 3Ph, 2Wdg REACTOR DIFFERENTIAL RELAY OF LOW IMPEDANCE TYPE.

NEUTRAL GROUNDING REACTOR SIDE CORE-1

64 REF1

--

64 REF2

--

CORE-2

64 REF1

--

64 REF 1 / 2

--

.

CORE -1

CORE -5

CORE -4

CORE -3

CORE -2

CORE -2

CORE -1

CORE -4

CORE -3

LINE SHUNT REACTOR

UUU

CORE -2

UUUUU UUUUU UUUUU

CORE -1

REACTOR BUSHING CT INFORMATION

1-PH NEUTRAL GROUNDING REACTOR

.

UUUUU UUUUU UUUUU CORE -4

CORE -3

CORE -2

CORE -1

CORE -5

CORE -4

CORE -3

CORE -2

CORE -1

REACTOR BUSHING CT INFORMATION

BUS SHUNT REACTOR

ONE & HALF BREAKER LINE & BUS SHUNT REACTOR PROTECTION SCHEME 87BB1 BUSBAR--1 BUSBAR 79 CVT VBB1

VL1

21M1 VBB1

25

VL1 / VL2 OR VBB2

BF 87L

21M2

VL1

CVT

VL1 FEEDER1 / LINE1

79 25

64R

OR

BF

VL1/VBB1/VBB2

UUU

VL2 / VBB2

UUU

VL1 / VBB1

87R

21R

87R

TEED-1

64R

UUU BF VL2 / VL1 OR VBB1

CVT VBB2

79

VBB1/VBB2

VBB2

TEED-2

25

PROTECTION OF BUS REACTOR 21R BUSBAR--2 BUSBAR

87BB2

FOR REACTOR PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .

LINE/BUS REACTOR DIFFERENTIAL PROTECTION (LOW IMPEDANCE DIFFERENTIAL PROTECTION)(87R1) CT MB

P2 P2 P2

RET 670

CT MB

3S1

3S1

3S1

3S2

3S2

3S2

3 3 3

R-CT

CORE-1

3 3 3

HV BUSHING

1S2

1S2

1S2

1S1

1S1

1S1

ACTIVE

START

TRIP

P2 P2 P2 R-CT

CTR: 200/1A

CLASS: PS

STAR BUSHING

DISPLAY

CORE-4 CTR: 200/1A

CLASS: PS

C

E

NORMALLY LOW IMPEDENCE (87R1) DIFFERENTIAL RELAY IS USED FOR BUS / LINE REACTOR DIFFERENTIAL PROTECTION

IN CASE OF REACTOR BUSHING CT P2 IS AWAY FROM REACTOR & P1 IS TOWARDS REACTOR

LINE/BUS REACTOR DIFFERENTIAL PROTECTION (HIGH IMPEDANCE DIFFERENTIAL PROTECTION) (87R2) P2 P2 P2

R-CT HV

CORE-2

3 3 3

BUSHING CT

RET 670 1S2 1S2 1S2 ACTIVE START

TRIP

1S1 1S1 1S1

CTR: 200/1A

CLASS: PS P1 P1 P1

DISPLAY C E

P1 P1 P1 R-CT STAR

CORE-3 CTR: 200/1A

3S1 3S1 3S1

3 3 3

BUSHING CT

3S2 3S2 3S2

CLASS: PS

P2 P2 P2

NORMALLY HIGH IMPEDENCE (87R2) DIFFERENTIAL RELAY IS USED FOR BUS / LINE REACTOR DIFFERENTIAL PROTECTION IN CASE OF REACTOR BUSHING CT P2 IS AWAY FROM REACTOR & P1 IS TOWARDS REACTOR

LINE/BUS REACTOR REF PROTECTION (NGR IS NOT AVAIALBLE) P2 P2 P2

R-CT HV

CORE-2

3 3 3

BUSHING CT


TRIP

2S1 2S1 2S1

CTR: 200/1A

CLASS: PS P1 P1 P1

DISPLAY C E

P1 P1 P1

NORMALLY HIGH IMPEDENCE VOLTAGE/CURRENT OPERATED SINGLE POLE RELAY IS USED FOR BUS / LINE REACTOR RESTRICTED EARTH FAULT PROTECTION. PRESENTLY NUMERICAL DIFFERENTIAL RELAYS HAVING IN BUILT FUNCTION OF 2 REF OR 2 SEF PROTECTIONS.

R-CT STAR

CORE-3 CTR: 200/1A

4S1 4S1 4S1

3 3 3

BUSHING CT

4S2 4S2 4S2

CLASS: PS

P2 P2 P2

IN CASE OF REACTOR BUSHING CT P2 IS AWAY FROM REACTOR & P1 IS TOWARDS REACTOR

LINE REACTOR REF PROTECTION (NGR IS AVAIALBLE) P2 P2 P2

R-CT HV

CORE-2

3 3 3

BUSHING CT


TRIP

2S1 2S1 2S1

CTR: 200/1A

CLASS: PS

DISPLAY

P1 P1 P1

C E

NGR-CT EARTH


P1


CLASS: PS

S1

3

CORE-2

S2

P2 IN CASE OF REACTOR BUSHING CT P2 IS AWAY FROM REACTOR & P1 IS TOWARDS REACTOR

LINE REACTOR 2 NOs REF PROTECTIONS (NGR IS AVAIALBLE) P2 P2 P2

R-CT HV

CORE-2

P2

2S2 2S2 2S2

3 3 3

BUSHING CT

RET 670 ACTIVE START

TRIP

2S1 2S1 2S1

1S2

3

1S1

CTR: 200/1A

CLASS: PS P1 P1 P1

DISPLAY

P1

C NGR-CT BUSHING CT CORE - 1 & 2

E

P1 P1 P1 R-CT STAR

CORE-4 CTR: 200/1A

4S1 4S1 4S1

3 3 3

BUSHING CT

4S2 4S2 4S2

CLASS: PS

P2 P2 P2


CTR: 200/1A

CLASS: PS

P1 2S1

3

2S2

P2

LINE/BUS REACTOR B/U IMPEDANCE PROTECTION

P2 P2 P2

IR3 / A311 IY3 / A331 IB3 / A351

R-CT HV

CORE-3

3 3 3

BUSHING CT

CT MB

3S2

3S2

3S2

3S1

3S1

3S1

IN3 / A371

REL 670 ACTIVE START

TRIP

VR11 / E111 VY11 / E131 VB11 / E151 VN11 / E171

CTR: 200/1A

CLASS: PS

DISPLAY C

CVT SELECTION BUS-1 CVT / BUS-2 CVT / LINE CVT CORE-2 VA : 100

E

CLASS: 3P

LINE REACTOR PROTECTION FOR LINE P2 P2 P2

1-CT CTR: 2000-1000-500/1A

(MAIN--1 PROTECTION) (MAIN IR5 / A511

VR11 / E111

IY5 / A531

VY11 / E131

IB5 / A551

3 3 3

CORE-5

CT MB

5S4

5S4

5S4

5S2

5S2

5S2

IN5 / A571


TRIP

VB11 / E151 VN11 / E171 1-CVT

CLASS: PS

DISPLAY


C

2-CT CTR: 2000-1000-500/1A

3 3 3

CORE-5

5S2

5S2

5S2

5S4

5S4

5S4

CLASS: PS

P2 P2 P2 LR-CT 400KV CTR: 2000-1000-500/1A

3 3 3

CORE-5

5S4

5S4

5S4

5S2

5S2

5S2

CLASS: PS P1 P1 P1

E

LINE REACTOR PROTECTION FOR LINE (MAIN--2 PROTECTION) (MAIN P2 P2 P2

1-CT CTR: 2000-1000-500/1A

IR4 / A411

VR21 / E211

IY4 / A431

VY21 / E231

IB4 / A451

3 3 3

CORE-4

CT MB

4S4

4S4

4S4

4S2

4S2

4S2

IN4 / A471


TRIP

VB21 / E251 VN21 / E271 1-CVT

CLASS: PS

DISPLAY


C

2-CT CTR: 2000-1000-500/1A

3 3 3

CORE-4

4S2

4S2

4S2

4S4

4S4

4S4

CLASS: PS

P2 P2 P2 LR-CT 400KV CTR: 2000-1000-500/1A

3 3 3

CORE-4

4S4

4S4

4S4

4S2

4S2

4S2

CLASS: PS P1 P1 P1

E

BUS REACTOR TEEDTEED-1 PROTECTION {BAY3&2}

P2 P2 P2

IR5 IY5 IB5

3-CT CTR: 2000-1000-500/1A

3 3 3

CORE-5

5S4

5S4

5S4

5S2

5S2

5S2

CLASS: PS

IN5

RET 670 P1 P1 P1 P2 P2 P2

IR5 IY5 IB5

2-CT CTR: 2000-1000-500/1A

3 3 3

CORE-1

1S4

1S4

1S4

1S2

1S2

1S2

CLASS: PS

IN5

ACTIVE START

TRIP

DISPLAY C

P1 P1 P1

E

P2 P2 P2 BR-RCT

IN5

CORE-5 CLASS: PS

5S4

5S4

5S4

5S2

5S2

5S2

3 3 3

CTR: 2000-1000-500/1A

IB5 IY5 IR5 P1 P1 P1

IT WORKS ON CIRCULATING CURRENT PRINCIPLE AND IT IS HIGH IMPEDENCE DIFFERENTIAL RELAY. TEED-1 PROTECTION FOR BAY 2&3 AND THE FOLLOWING CTs & CORES ARE USED 3CT(CORE-5), 2-CT(CORE-1) & BR-CT (CORE-5) ARE STARRED AND CONNECTED TO TEED-1 PROTECTION

BUS REACTOR TEEDTEED-2 PROTECTION {BAY3&2} P2 P2 P2

CT MB CT MB

P2 P2 P2

3-CT CTR: 2000-1000-500/1A

3 3 3

CORE-4

4S4

4S4

4S4

4S2

4S2

4S2

CLASS: PS

RET 670 ACTIVE

START

2S4

2S4

2S4

2S2

2S2

2S2

3 3 3

TRIP

2-CT CORE-2

DISPLAY

CTR: 2000-1000-500/1A

CLASS: PS

P2 P2 P2 CT MB BR-CT

C

CORE-4 CLASS: PS

3 3 3

CTR: 2000-1000-500/1A

4S4

4S4

4S4

4S2

4S2

4S2

E

IT WORKS ON KIRCHOFF’S CURRENT PRINCIPLE & IT IS PERCENTAGE BIASED LOW IMPEDENCE DIFFERENTIAL RELAY. TEED-2 PROTECTION FOR BAY 2&3 IS THE FOLLOWING CTs & CORES ARE USED. 3-CT(CORE-4), 2-CT(CORE-2) & BR-CT (CORE-4) ARE CONNECTED TO TEED-2 PROTECTION.

REACTOR BAY CONTROL UNIT (BCU) P2 P2 P2

IR2 / D211 IY2 / D231 IB2 / D251

R-CT STAR

CORE-2

3 3 3

BUSHING CT

CT MB

2S2

2S2

2S2

2S1

2S1

2S1

CTR: 200/1A

CLASS: 0.2

IN2 / D271

VR31 / E311 VY31 / E331 VB31 / E351 VN31 / E371 BASED ON SELECTION LINE CVT / BUS-1 CVT / BUS-2 CVT CORE – 3 100VA CLASS: 0.2

CARRIER INTERTRIPPING OF LINE SHUNT REACTOR LINE SHUNT REACTOR PROTECTION TRIPPINGS WILL BE USED AS DIRECT TRIPPINGS OF LINE IN ADDITION TO OTHER TRIPPINGS. BUS SHUNT REACTOR NEED NOT REQUIRE CARRIER INTER TRIPPING FACILITY. 87R1 REACTOR DIFFERENTIAL RELAY RET 670 21R REACTOR IMPEDENCE RELAY REL 670

ABB NSD 50

LINE PROTECTION COUPLER PANEL-1

DC +VE FROM PANEL

87R2/64R RESTRICTED EARTH FAULT RELAY

RET 670 REACTORS INTERNAL FAULTS

G4AD V9LC 2

GROUP-1/A TRIPPINGS

G4AD V9LC 1 87R1 REACTOR DIFFERENTIAL RELAY RET 670 21R REACTOR IMPEDENCE RELAY REL 670

ABB NSD 50

DC –VE FROM PANEL

LINE PROTECTION COUPLER PANEL-2

DC +VE FROM PANEL

87R2/64R RESTRICTED EARTH FAULT RELAY

RET 670 REACTORS INTERNAL FAULTS

G4AD V9LC 2

GROUP-2/B TRIPPINGS

G4AD V9LC 1

DC –VE FROM PANEL

ADDITIONAL AND SPECIAL FUNCTIONS ADOPTED IN ONE AND HALF CIRCUIT BREAKER SCHEME (EVENT LOGGER & DISTURBANCE RECORDER) PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

400KV SUBSTATION: MAMIDIPALLY 19 MAR 2004 13:00:00 A 13:09:37.090 # 195 A 13:09:37.096 # 188 A 13:09:37.097 # 187 A 13:09:37.100 # 181 A 13:09:37.104 # 162 A 13:09:37.110 # 196 A 13:09:37.110 # 170 A 13:09:37.111 # 161 A 13:09:37.111 # 163 A 13:09:37.111 # 169 A 13:09:37.112 # 168 A 13:09:37.113 # 182 A 13:09:37.126 # 199 A 13:09:37.140 # 185 N 13:09:37.147 # 195 N 13:09:37.148 # 196 N 13:09:37.175 # 187 N 13:09:37.176 # 181 N 13:09:37.176 # 188 N 13:09:37.185 # 182 N 13:09:37.257 # 199 N 13:09:37.279 # 185 19 MAR 2004 14:00:00 N 14:09:48.702 # 163 N 14:09:48.704 # 161 N 14:09:48.720 # 162 N 14:10:00.903 # 169 N 14:10:00.907 # 168 N 14:10:00.907 # 170 19 MAR 2004 15:00:00

EVENT LOGGER EVENTS INFORMATION

400KV SRISAILAMSRISAILAM-2 MAIN MAIN--2 RAZFE PROT TRIP 400KV SRISAILAMSRISAILAM-2 MAIN MAIN--1 REL100 PROT START’Y’ 400KV SRISAILAMSRISAILAM-2 MAIN MAIN--1 REL100 PROT START’R’ 400KV SRISAILAMSRISAILAM-2 MAIN MAIN--1 REL100 PROT TRIP 400KV SRISAILAMSRISAILAM-2 MAIN CB 752 Y Y--PH OPEN 400KV SRISAILAMSRISAILAM-2 MAINMAIN-2 RAZFE CARRIER SEND 400KV SRISAILAMSRISAILAM-2 AT/FAT/F-2 TIE CB 852 B B--PH OPEN 400KV SRISAILAMSRISAILAM-2 MAIN CB 752 RR-PH OPEN 400KV SRISAILAMSRISAILAM-2 MAIN CB 752 B B--PH OPEN 400KV SRISAILAMSRISAILAM-2 AT/FAT/F-2 TIE CB 852 YY-PH OPEN 400KV SRISAILAMSRISAILAM-2 AT/FAT/F-2 TIE CB 852 R R--PH OPEN 400KV SRISAILAMSRISAILAM-2 MAINMAIN-1 REL100 CARRIER SEND 400KV SRISAILAMSRISAILAM-2 CARRIER PROT CHCH-2 RECEIVED 400KV SRISAILAMSRISAILAM-2 CARRIER PROT CHCH-1 RECEIVED 400KV SRISAILAMSRISAILAM-2 MAINMAIN-2 RAZFE PROT TRIP RESET 400KV SRISAILAMSRISAILAM-2 MAINMAIN-2 RAZFE CARRIER SEND RESET 400KV SRISAILAMSRISAILAM-2 MAINMAIN-1 REL100 START ‘R’ RESET 400KV SRISAILAMSRISAILAM-2 MAINMAIN-1 REL100 PROT TRIP RESET 400KV SRISAILAMSRISAILAM-2 MAINMAIN-1 REL100 START ‘Y’ RESET 400KV SRISAILAMSRISAILAM-2 MAINMAIN-1 REL100 CARRIER SEND RESET 400KV SRISAILAMSRISAILAM-2 CARRIER PROT CHCH-2 RECEIVED RESET 400KV SRISAILAMSRISAILAM-2 CARRIER PROT CHCH-1 RECEIVED RESET 400KV SRISAILAMSRISAILAM-2 MAIN CB 752 B B--PH CLOSE 400KV SRISAILAMSRISAILAM-2 MAIN CB 752 R R--PH CLOSE 400KV SRISAILAMSRISAILAM-2 MAIN CB 752 Y Y--PH CLOSE 400KV SRISAILAMSRISAILAM-2 AT/FAT/F-2 TIE CB 852 Y Y--PH CLOSE 400KV SRISAILAMSRISAILAM-2 AT/FAT/F-2 TIE CB 852 R R--PH CLOSE 400KV SRISAILAMSRISAILAM-2 AT/FAT/F-2 TIE CB 852 B B--PH CLOSE

DISTURBANCE RECORDER

R PH VOLTAGE Y PH VOLTAGE B PH VOLTAGE OPEN DELTA VOLTAGE R PH CURRENT Y PH CURRENT B PH CURRENT STAR/NEUTRAL CURRENT MAIN CB R PH OPEN MAIN CB Y PH OPEN MAIN CB B PH OPEN TIE CB R PH OPEN TIE CB Y PH OPEN TIE CB B PH OPEN MAIN/TIE CB LBB OPTD DIRECT TRIP CH-1/2 OPTD BUSBAR PROT OPTD MAIN-1 PROT OPTD MAIN-2 PROT OPTD OVER VOLTAGE STAGE-1/2 OPTD STUB PROT-1/2 OPTD MAIN-1 PROT CARRIER RECEIVE MAIN-2 PROT CARRIER RECEIVE DF/DT OPTD EVENT NO NAME OF FEEDER DATE & TIME

PREFERRED DISTURBANCE RECORDER 400 KV LINES

400 KV TRANSFORMER

ANALOG CHANNELS

ANALOG CHANNELS

DIGITAL CHANNELS

1. 2. 3. 4. 5. 6. 7. 8.

1. HV 2. HV 3. HV 4. HV 5. LV 6. LV 7. LV 8. LV 9. HV 10. HV 11. HV 12. HV 13. LV 14. LV 15. LV 16. LV

1. HV MAIN CB R-PH OPEN 2. HV MAIN CB Y-PH OPEN 3. HV MAIN CB B-PH OPEN 4. HV TIE CB R-PH OPEN 5. HV TIE CB Y-PH OPEN 6. HV TIE CB B-PH OPEN 7. LV 220 CB R-PH OPEN 8. LV 220 CB Y-PH OPEN 9. LV 220 CB B-PH OPEN 10. 87 T1 DIFF RLY OPERATED 11. 87 T2 DIFF RLY OPERATED 12. HV 67 ABCN OPERATED 13. LV 67 ABCN OPERATED 14. 51 O/L RLY OPERATED 15. NDR RLY OPERATED 16. HV 99T OVER FLUX OPTD 17. LV 99T OVER FLUX OPTD 18. HV 400 BUSBAR OPERATED 19. LV 220 BUSBAR OPERATED 20. HV MAIN CB LBB OPERATED 21. HV TIE CB LBB OPERATED 22. LV MAIN CB LBB OPERATED 23. HV 86 GR-A/B RELAY OPTD 24. LV 86 GR-A/B RELAY OPTD 25. AT/F 21T UZ RELAY OPERATED 26. OIL TEMP HIGH TRIP 27. WNDG TEMP HV/IV/LV TRIP 28. BUCHHOLZ MAIN/OLTC TRIP 29. PRD 1/ 2 TRIP 30. AT/F NEUTRAL CURRENT TRIP

R-PH VOLTAGE Y-PH VOLTAGE B-PH VOLTAGE OPEN DELTA VOLTAGE R-PH CURRENT Y-PH CURRENT B-PH CURRENT NEUTRAL/STAR CURRENT

DIGITAL CHANNELS 1. HV MAIN CB R-PH OPEN 2. HV MAIN CB Y-PH OPEN 3. HV MAIN CB B-PH OPEN 4. HV TIE CB R-PH OPEN 5. HV TIE CB Y-PH OPEN 6. HV TIE CB B-PH OPEN 7. 21 MAIN1 REL 521 OPERATED 8. 21 MAIN2 REL 316 OPERATED 9. 87 BUSBAR RELAY OPERATED 10. MAIN CB A/R OPERATED 11. TIE CB A/R OPERATED 12. PSB OPERATED 13. SOTF OPERATED 14. 27 O/V STG-1/2 OPERATED 15. 51 STUB-1/2 OPERATED 16. 87HZ / LZ TEED-1/2 OPERATED 17. MAIN CB LBB OPERATED 18. TIE CB LBB OPERATED 19. DIRECT TRIP CH-1/2 TRIP 20. 21M1 / 21M2 CARRIER RECEIVE 21. 86 GR-A/B RELAY OPERATED 22. 67N DEF/TEF RLY OPERATED 23. DF/DT RELAY OPERATED

R-PH VOLTAGE Y-PH VOLTAGE B-PH VOLTAGE OPEN DELTA VOLTAGE R-PH VOLTAGE Y-PH VOLTAGE B-PH VOLTAGE OPEN DELTA VOLTAGE R-PH CURRENT Y-PH CURRENT B-PH CURRENT NEUTRAL/STAR CURRENT R-PH CURRENT Y-PH CURRENT B-PH CURRENT NEUTRAL/STAR CURRENT

CONFIGUARATION OF CONTROL & RELAY PANELS IN ONE AND HALF CIRCUIT BREAKER SCHEME


CONFIGUARATION OF C & R PANEL BUSBAR PANEL

CB RELAY PANEL

1. BCU 2. BUS-1 V&F LED MFM WITH MODBUS 3. BUS-2 V&F LED MFM WITH MODBUS 4. BUSBAR CENTRAL UNIT 5. BB OUT OF SERVICE SEL SWITCH 6. BUS-1 ES CMR 7. BUS-2 ES CMR 8. DC-1 HEALTHY INDICATION 9. DC-2 HEALTHY INDICATION 10. BUSBAR PROT AUX RELAYS 11. CLOSING AUX RELAYS

1. BAY CONTROL UNIT 2. BREAKER FAILURE RELAY 3. AUTO RECLOSURE RELAY 4. CHECK SYNCHRONISING RELAY 5. CB ALARM RELAYS 6. CB TRIP CKT SUPERVISION RELAYS 7. 3-PH TRIP UNITS 86-GA, 86-GB & 96/50Z 8. 1-PH TRIP RELAYS M1, M2 - 1 2 Nos 9. DIRECT TRIP RECEIVE RELAYS 10. DC SUPERVISION RELAYS 11. U/V RELAY E/S I/L 12. CB EMERGENCY TNC SWITCH 13. CLOSING AUX RELAYS 14. ENERGY METER WITH TTB 15. PANEL INDICATING LABEL

* IN CASE OF DUPLICATE PROTECTION 2 NOS BUSBAR CENTRAL UNITS ARE AVAILABLE

LINE PROTECTION PANEL 1. MAIN-1 NUM. DIST. PROT 2. MAIN-2 NUM. DIST. PROT. 3. O/V STAGE-1 (EXT/IN BUILT) 4. O/V STAGE-2 (EXT/IN BUILT) 5. DISTURBANCE RECORDER(EXT/INBUILT) 6. DISTANCE TO FAULT (EXT/ INBUILT) 7. DC SUPERVISION RELAYS 8. TEED-1 PROTECTION 9. TEED-2 PROTECTION 10. STUB-1/2 PROTECTION (EXT/ INBUILT) 11. MAIN-1 CARRIER SEL.SWITCH 12. MAIN-2 CARRIER SEL.SWITCH 13. CARRIER RECEIVE RELAYS 14.PANEL INDICATING LABEL

CONFIGUARATION OF C & R PANEL TRANSFORMER PROTECTION PANEL

BUS REACTOR CB RELAY PANEL

LINE / BUS REACTOR PROTECTION PANEL

1. T/F DIFFERENTIAL PROTECTION-1 2. T/F DIFFERENTIAL PROTECTION-2 3. DIRECTIONAL O/L E/F RELAYS-HV 4. DIRECTIONAL O/L E/F RELAYS-LV 4. OVER FLUX PROTECTION-HV & LV 5. OVER LOAD PROTECTION 6. VOLTAGE SELECT RELAYS- HV & LV 7. FUSE FAILURE RELAY- HV & LV 8. AUX RELAYS FOR T/F TROBLES 9. CIRCUIT LABEL

1. BAY CONTROL UNIT 2. BREAKER FAILURE RELAY 3. CB ALARM RELAYS 4. CB TRIP CKT SUPERVISION RELAYS 5. 3-PH TRIP UNITS 86-GA, 86-GB & 96/50Z 6. DC SUPERVISION RELAYS 7. U/V RELAY E/S I/L 8. CB EMERGENCY TNC SWITCH 9. MFM WITH TTB 10. PANEL INDICATING LABEL

1. REACTOR DIFFERENTIAL PROT 2. REF PROTECTION RELAY 3. REACTOR IMPEDENCE PROTECTION 4. CVT SELECTION RELAYS 5. FLAG RELAYS 6. AUX RELAYS 7. TIMERS 8. CIRCUIT LABEL

IN ADDITION TO THE ABOVE THE FOLLOWING PANELS WILL BE AVAILABLE 1. CONTROL & RELAY PANEL B/C, B/S, TBC (AS & WHEN REQ) 2. COMMON CONTROL PANEL IS PART OF BUSBAR PANEL I. NOMINCLATURE FOR PANELS ARE NORMALLY MAIN CB C&RPANEL – RLA, TIE CB C&R PANEL – RTB, HV CB C&RPANEL – RTRA, LV CB C&R PANEL – RTRC, LINE PROTECTION PANEL – RLB, ICT PROTECTION PANEL – RTRB, LINE REACTOR PROTECTION PANEL – RLRC, BUS REACTOR PROTECTION PANEL – RBRA, BUS BAR PANEL – RBB,

400KV & 220KV BUSBAR & COMMON CONTROL PANEL 4RBB

2 RBB

BCU

MFM2

Bus Bar Aux relays

DC -1 DC -2

BUSBAR CENTRAL UNIT 89BB2 AE CMR

89BB2 AE CMR

89BB1 AE CMR

BUSBAR CENTRAL UNIT

MFM2

BCU

89BB1 AE CMR

MFM1

MFM1

Bus Bar Aux relays

DC -1 DC -2

APTRANSCO IS FOLLOWING SINGLE BUS BAR PROTECTION. POWERGRID IS FOLLOWING DUPLICATE BUS BAR PROTECTION. ABB, AREVA, SIEMENS, TOSHIBA ARE HAVING DISTRIBUTED ARCHITECTURE. ABB, AREVA, GE, ERL PHASE, SEL ARE HAVING CENTRALISED ARCHITECTURE. LBB IS THE PART OF BUSBAR IS LATEST CONCEPT. INCASE OF DISTRIBUTED ARCHITECTURE BAY/PERIPHERAL UNIT IS DATA AQUSITION UNIT AND COMMUNICATE TO CENTRAL UNIT THROUGH FIBER OPTIC CABLE. DISTRIBUTED ARCHITECTURE - LBB IS INBUILT LOGIC. CENTRALISED ARCHITECTURE - LBB IS STAND ALONE. FINALLY THE CONCEPT AS FOLLOWS IN FUTURE FOR FEEDER : REDUNDANT DISTANCE PROTECTION. FOR ICT : REDUNDANT DIFFERENTIAL PROTECTION. FOR BUSBAR : REDUNDANT BUSBAR PROTECTION.

400KV LINE + REACTOR CB RELAY & PROTN PANEL 4RLA

4RLRC1/RBR3

4RLB

4RTB2

75A,B,L

LBB/ BU 50Z TRIP COIL

96 50Z

64R

21L2

CB PB


CB 1&2 TROUBLES HEALTHY LEDS & ALARMS

Reactor Trouble Alarms & Trips

DC-2

186 86 R1,Y1,B1 GR-A R2,Y2,B2 286 86 R1,Y1,B1 GR-B R2,Y2,B2

A/R+SC 79+25

DC-1


BAY2 BCU

21R

59-1&2

186 86 R1,Y1,B1 GR-A R2,Y2,B2 286 86 R1,Y1,B1 GR-B R2,Y2,B2 50 ZT

D/T-1 D/T-2 Receive Receive Relays Relays

99R

DC-1

A/R+SC 79+25

87R

21L1

DC-2

BAY1 BCU

CB PB

400KV ICT CB RELAY & PROTN PANEL 4RTRA3

475 A,B,L

LBB/ BU 50Z

50 ZT

DC-1 DC-2


CB PB

LV BAY BCU

LBB/ BU 50Z

LBB/ BU 50Z

87T2

TRIP COIL


86 GR-A 86 GR-B Inter 96/ Trip 50Z Relays

DC-1

TRIP COIL


87T1

BAY3 BCU

DC-2

A/R+SC 79+25

275 A,B

Transformer Trouble Alarms & Trips

67HV

67IV

TRIP COIL


86 GR-A 86 GR-B 96/ 50Z

CB PB

MFM

99HV

99IV

DC-1

BAY2 BCU

4RTRC3

4RTRB3

DC-2

4RTB2

Inter Trip Relays

CB PB

MFM

220KV FEEDER CB RELAY & PROTN PANEL 2RLA1

2RLB1

75A 75B BAY1 BCU

A/R+SC 79+25

21L1


21L2

96 / 50Z

DC-2


DC-1


TTS CB PB

MFM

D/T-1 D/T-2 Receive Receive Relays Relays

220KV BC, TBC & BS CB RELAY & PROTN PANELS 2RTBC

TBC BCU

DC-1 DC-2

86 GR-A 86 GR-B 96 50Z

CB PB

50/51 A,B C,N



186 86 R1,Y1,B1 GR-A R2,Y2,B2 286 86 R1,Y1,B1 GR-B R2,Y2,B2 96 50Z

DC-1

TRIP COIL


A/R+SC 79+25

DC-2

LBB/ BU 50Z

BS BCU

CB PB

LBB/ BU 50Z



DC-1

BC BCU

LBB/ BU 50Z

2RBS

86 GR-A

DC-2

2RBC

86 GR-B 96 50Z

CB PB

50/51 A,B C,N

SUBSTATION AUXILIARIES & TERMINAL PANELS SSAUX For AC 415V System-1 BCU1 For DC 220V System-1 BCU3 For DC 48V System-1 BCU5 For Air condition System

For AC 415V System-2 BCU2 For DC 220V System-2 BCU4 For DC 48V System-2

Base System

Hot Standby

Alarm Unit

Alarm Unit

BCU6 For Fire Fighting System

BCU7

BCU8

For Diesel Generator System

For fire & Smoke Detector

BCU9

BCU10

Main Server ABB Network Partner AG

COM581


COM581

C E

C E

Communication Gateway Network Partner

SSLTA 88 SERVICE RS232


Redunt Server

COM581

SRS485M

SRS485M

RS485

RS485

SREDU/M

1MRSC60029 1MRSC60028 1MRSC60028 1MRSC60028 1MRSC60028 1MRSC60028 1MRSC60028

Ethernet Switch

Router to ALDC/SLDC Network Partner

SSLTA 88 SERVICE RS232

SRS485M

SRS485M

RS485

RS485

SREDU/M


Ethernet Switch

C E

Surveillance system

Line Printer for Alarm / Event

Metering Values DOT Matrix Printer

SUBSTATION AUTOMATION

2 Ports for RCC & 2 Ports for ALDC/SLDC COMMUNICATION GATEWAY TO RCC & ALDC RCC LDC

Base System

Service Modem

DM Printer For 15 Min Metering & Trends

Engineering & DR work Station LAPTOP

Base System

Alarm Unit

Alarm Unit

Hardcopy Printer + MFD

Auxiliary Alarm Annunciation

Alarm/Event Line Printer

GPS Meinberg

Printer Server

POWER V1 OVP

GPS 166 ACQR LOCK

SATELLITE CONTROLLED CLOCK

NORMAL OPERATION WED 11.12.1996 MEZ 11.42.25 SV 24 > SY N

MENUCLR NEXT INC ACK MEINBERG

Ethernet (TCP/IP) Network Partner

Rugged Com/Equivalent Ethernet Switches forming ‘Redundant Managed switched Ethernet LAN on fiber optic medium Interbay bus on IEC61850 Communication Gate way with hot standby for RCC and SLDC’ For Control and Protection Relays.

SSLTA 88SRS485MSRS485MSREDU/M SERVICE RS232 RS485

RS485


M

M

M

LOCAL

?

REMOTE

SET OPERATION

DIGITAL PLCC/ OLTE SYSTEM



9 10 11 12 13 14 15 16

9 10 11 12 13 14 15 16


9 10 11 12 13 14 15 16

C E M

M

M

LOCAL

?

REMOTE

M

SET OPERATION

CARR PROT SYSTEM


1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

LOCAL REMOTE

M

SET OPERATION

EM

M

M

LOCAL

?

CARR PROT SYSTEM

REMOTE

1 2 3 4 5 6 7 8

C E

9 10 11 12 13 14 15 16

C E

M

M

?

REL531

9 10 11 12 13 14 15 16

C E

CARR PROT SYSTEM

9 10 11 12 13 14 15 16

HYD RAN

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

C E

SET OPERATION

CARR PROT SYSTEM


REL531

9 10 11 12 13 14 15 16

9 10 11 12 13 14 15 16

CARR PROT SYSTEM

CARR PROT SYSTEM

9 10 11 12 13 14 15 16

9 10 11 12 13 14 15 16

EM

HYD RAN

EM

HYD RAN

EM

AVR

EM

AVR

EM

OTH

EM

OTH

C E C E

M

M

M

LOCAL

?

REMOTE

EM

AVR

EM

OTH

SET

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

1 2 3 4 5 6 7 8

OPERATION

C E

M

M

M

?

LOCAL REMOTE

9 10 11 12 13 14 15 16

C E

ABB Network PartnerREL511 AG

SET OPERATION

C E

Network Partner

SSLTA 88SRS485MSRS485MSREDU/M SERVICE RS232 RS485

RS485


TRIP LOGICS OF ONE AND HALF CIRCUIT BREAKER SCHEME PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

GROUP--A & GROUPGROUP GROUP-B TRIPPINGS FOR 400KV STATIONS THERE SHALL BE TWO SEPARATE BATTERY SYSTEMS AVAILABLE FOR PROTECTION, CONTROL & TRIPPING/CLOSING OPERATIONS. TO OBTAIN REDUNDENCY AND TO BE ABLE TO TAKE PROTECTION OUT FOR MAINTANENCE, WHILE EQUIPMENT IS IN SERVICE, THE RELAYS ARE ELECTRICALLY AND PHYSICALLY SEGREGATED IN TO TWO GROUPS. GROUPING IS DONE TO THE EXTENT POSSIBLE IN SUCH A WAY THAT EACH GROUP CAN INDEPENDENTLY CARRYOUT PROTECTIVE FUNCTIONS WITH NEAR EQUAL REDUNDENCY. INTER CONNECTION OF THESE TWO GROUPS SHALL NOT BE GENERALLY BE ATTEMPTED. DISTRIBUTION OF DC SUPPLY SHALL BE DONE BAY WISE TO FEED THE FOLLOWING 1. PROTECTION 2. CB CONTROL 3. ISOLATOR / EARTH SWITCH CONTROL 4. ANNUNCIATION / INDICATION

LINE PROTECTION

TRANSFORMER PROTECTION

REACTOR PROTECTION

GROUP--A GROUP

GROUP--A GROUP

GROUP--A GROUP

MAIN-1 : 21L1: LINE PROTECTION M1 BUILT IN FUNCTIONS TEED-1 PROTECTION (87 TEED1) OVER VOLTAGE STAGE-1 PROT(59L1) DIRECT TRIP CHANNEL-1 RECEIVED

MAIN1: 87T1 : ICT DIFF PROTN B/U : 67HV: ICT HV BACKUP RELAY B/U : 21T: ICT B/U IMP RELAY T/F HV OVERFLUX RELAY OIL TEMP HIGH TRIP PRESURE RELIEF TRIP TERITIARY DELTA WNDG NDR PROT

MAIN1: 87R1 : REACTOR DIFF PROT B/U : 21R: REACTOR B/U IMP RELAY OIL TEMP HIGH TRIP PRESURE RELIEF TRIP

GROUP--B GROUP MAIN-2 : 87L2 : LINE PROTECTION M2 BUILT IN FUNCTIONS TEED-2 PROTECTION (87 TEED2) OVER VOLTAGE STAGE-2 PROT (59L2) DIRECT TRIP CHANNEL-2 RECEIVED GROUP-BB GROUPLBB/BFR RELAY BUSBAR PROTECTION

GROUP--B GROUP MAIN2 : 87T2: ICT DIFF PROTN B/U : 67LV: ICT LV BACKUP RELAY B/U : 51O/C: ICT NCT B/U RELAY T/F LV OVERFLUX RELAY OVER LOAD PROT (ALARM ONLY) BUCHHOLZ TRIP OLTC BUCHHOLZ TRIP WINDING TEMP HIGH TRIP LOW/ HIGH OIL LEVEL TRIP

GROUP--B GROUP MAIN2: 87R2 : REACTOR DIFF PROT BUCHHOLZ TRIP WINDING TEMP HIGH TRIP LOW/ HIGH OIL LEVEL TRIP FIRE PROTECTION TRIP

SOTF, PSB

MAIN-1/MAIN-2 CARRIER SEND

X

X

X

X

X

X

X

INITIATE 400KV B/B PROT

X

DIRECT TRIP CARRIER SEND

X

BLOCK T_CB A/R RELAY

INITIATE SCADA (DR & SOE)

X

INITIATE ALARM

X

X

BLOCK M_CB A/R RELAY

1-PH

START T_CB A/R RELAY

B

X

START M_CB A/R RELAY

21 L2

INITIATE T_CB 1PH TRIP UNIT GR-B INITIATE T_CB 3PH TRIP UNIT GR-B

MAIN-2 PROTECTION

X

INITIATE T_CB 3PH TRIP UNIT GR-A

1-PH


OUTPUT

A

INITIATE M_CB 3PH TRIP UNIT GR-B

GROUP

21 L1


SYMBOL

MAIN-1 PROTECTION

INITIATE M_CB 3PH TRIP UNIT GR-A

PROTECTION RELAY


MAIN CB FOR LINE (1(1-52CB)TRIPPING LOGICS

IN BUILT FUNCTIONS OF DISTANCE SCHEME

OVER VOLTAGE STAGE-1 & STAGE-2 (BUILT – IN 21 M1)

59 L1 & L2

A

3-PH

OVER VOLTAGE STAGE-1 & STAGE-2 (BUILT – IN 21 M2)

59 L1 & L2

B

3-PH

STUB, TOC, BOC, TEF, DEF, (BUILT- IN 21M1)

A

3-PH

STUB, TOC, BOC, TEF, DEF, (BUILT- IN 21M2)

B

3-PH

TEED PROT-1

87T HZ

A

3-PH

TEED PROT-2

87T LZ

B

3-PH

DIRECT TRIP CH-1 RECD

A

3-PH

DIRECT TRIP CH-2 RECD

B

3-PH

M_CB BFR / LBB PROT

B

3-PH

T_CB BFR / LBB PROT

B

3-PH

X

X

X

X

X

X

X X

X X

X X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X X

X X

X

X X

X

INITIATE T_CB A/R PRIORITY

INITIATE ALARM

TO SCADA (DR & SOE)

1-PH & 3PH

X

X

X

X

SYNC CHECK RELAY (BUILT IN 21M1 & 21M2)

25 SYNC

A&B

3-PH

X

X

X

X

1-PH TRIP UNIT GR-A

186

A

1-PH

X

X

X

3-PH TRIP UNIT GR-A

86 GR A

A

3-PH

X

X

X

X

X

1-PH TRIP UNIT GR-B

286

B

1-PH

X

X

X

3-PH TRIP UNIT GR-B

86 GR B

B

3-PH

X

X

X

X

X

TRIP SIGNAL FROM 400KV BUSBAR PROTECTION

96 BB

3-PH

X

X

X

LINE UNDER VOLTAGE RELAY

27 UV

89LE C LOSE PERMISSION

OUTPUT

A&B

START LBB/BFR M_C B

GROUP

79 A/R

INITIATE M_C B TRIP COIL-2

SYMBOL

AUTO RECLOSURE RELAY (BUILT IN 21M1 & 21M2)

INITIATE M_C B TRIP COIL-1

PROTECTION RELAY

CLOSE MAIN CB

MAIN CB FOR LINE (1(1-52 CB) TRIPPING LOGICS

X

PROTECTION RELAY SYMBOL GROUP OUTPUT

T_CB BFR / LBB PROT 50 ZT B 3-PH

M_CB BFR / LBB PROT (152 CB & 352 CB) 50 Z B 3-PH

AUTO RECLOSURE RELAY 79 A/R A & B 1-PH & 3-PH

SYNC CHECK RELAY 25 3-PH

1-PH TRIP UNIT GR-A 186 A 1-PH X X

3-PH TRIP UNIT GR-A 86A A 3-PH X X

1-PH TRIP UNIT GR-B 286 B 1-PH X X

3-PH TRIP UNIT GR-B 86B B 3-PH X X

DIRECT TRIP CH-1 RECD A 3-PH

DIRECT TRIP CH-2 RECD B 3-PH

X

X X

INITIATE SCADA (DR & SOE)

X

INITIATE ALARM

X

DIRECT TRIP CARRIER SEND

252 START LBB/BFR OF T_CB 252 CLOSE T_CB

252 INITIATE T_CB TRIPCOIL TRIPCOIL-1 & COIL-2

352 INITIATE M_CB 1PH TRIP UNIT GR GR-B 352 INITIATE M_CB 3PH TRIP UNIT GR GR-B

352 INITIATE M_CB 1PH TRIP UNIT GR GR-A 352 INITIATE M_CB 3PH TRIP UNIT GR GR-A

252 INITIATE T_CB 1PH TRIP UNIT GR GR-B 252 INITIATE T_CB 3PH TRIP UNIT GR GR-B

252 INITIATE T_CB 3PH TRIP UNIT GR GR-A

252 INITIATE T_CB 1PH TRIP UNIT GR GR-A

152 INITIATE M_CB 1PH TRIP UNIT GR GR-B 152 INITIATE M_CB 3PH TRIP UNIT GR GR-B

152 INITIATE M_CB 1PH TRIP UNIT GR GR-A 152 INITIATE M_CB 3PH TRIP UNIT GR GR-A

TIE CB TRIPPING LOGICS

X X X

X X X

X X X

X X X

X X

X X

INITIATE SCADA ( SOE)

HV BACKUP PROTECTION

67 ABCN

A

3-PH

X

X

X

X

X

X

HV OVER FLUX PROT

99T HV

A

3-PH

X

X

X

X

X

X

OVER LOAD RELAY

51 O/L

A

3-PH

X

X

X

X

X

X

HV PROT TRIP UNIT GR-A & B

86 GR-A/B

A/B

3-PH

X

X

X

REF PROTECTION

64T(HZ)

B

3-PH

X

X

X

TEED PROT-1 / 2

87T HZ/LZ

A/B

3-PH

X

X

X

X

STUB PROT

50 STUB

A

3-PH

X

X

X

X

AT/F TROUBLE TRIP HV & LV

86 GR-A/B

A/B

3-PH

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X X

X X

X

X X

X

X

X X

X

X

X

X X

X

X

INITIATE LV_CBTRIP COIL-2

X

INITIATE LV_CB TRIP COIL-1

X

START LV_CB LBB/BFR RELAY

X

START M_CB LBB/BFR RELAY

X


X


X

INTER TRIP CIRCUIT HV & LV

3-PH

INITIATE M_CBTRIP COIL-2

A

INITIATE M_CB TRIP COIL-1

INITIATE ALARM

INITIATE LV_CB 3PH TRIP UNIT GR-B


INITIATE LV_CB 3PH TRIP UNIT GR-A

OUTPUT

87T(LZ)

INITIATE T_CB 3PH TRIP UNIT GR-B

GROUP

DIFFERENTIAL RELAY


PROTECTION RELAY

SYMBOL


MAIN CB FOR AT/F (3(3-52CB)TRIPPING LOGICS

X

AT/F TROUBLE ALRM M_CB BFR / LBB PROT

50Z

B

3-PH

X

T_CB BFR / LBB PROT

50ZT

B

3-PH

X

LV_CB BFR / LBB PROT

50Z

B

3-PH

X

400KV B/B PROT

87 BB

96

3-PH

X

X

220KV B/B PROT

87 BB

96

3-PH

X

X

LV BACKUP PROTECTION

67 ABCN

B

3-PH

X

X

X

X

X

X

LV OVER FLUX PROT

99T LV

B

3-PH

X

X

X

X

X

X

TERI NEUTRAL DISP PROT

151N

A

3-PH

X

X

X

LV PROT TRIP UNIT GR-A & B

86 GR-A/B

A/B

3-PH

X

X

X

X

X

X

X

X

X

X

X X

X

X

X

X

X

X

X

PROTECTION TRIP SCHEME ABB Network Partner AG ABB Network Partner AG

REL531

REL531

21 MAIN 1

86 86--A MTR/ HSTR

C

87 T LZ

86 86--A MTR/ HSTR

C

E

E

TRIP COIL-1 1-52CB TRIP COIL-2 BUS-1


TRIP COIL-1 2-52CB

TRIP COIL-1 3-52CB

TRIP COIL-2

TRIP COIL-2 BUS-2 ABB Network Partner AG

REC 316*4

21 MAIN 2

86 86ABB -B REL521 MTR/ MAINMAIN HSTR -1

1

9

2 3 4 5 6

10 11 12 13 14

7 8

15 16

C

E

86 86--A MTR/ HSTR

1

86 86--B MTR/ HSTR

REC 316*4

87 T HZ 9

2 3 4 5 6

10 11 12 13 14

7 8

15 16

C

86 86--B MTR/ HSTR

E

8686-A : GROUP GROUP--A MASTER TRIP RELAY / HIGH SPEED TRIP RELAY 8686-B : GROUP GROUP--B MASTER TRIP RELAY / HIGH SPEED TRIP RELAY

MAIN-1/ MAINMAINMAIN-2 ZONE--1 & SINGLE PHASE FAULT ZONE INITIATE MAIN CB GR-A 1-PH TRIP UNIT ( INTURN IT WILL TRIP 1-POLE )

REL 521 ACTIVE

START

TRIP

INITIATE TIE CB GR-A 1-PH TRIP UNIT ( INTURN IT WILL TRIP 1-POLE ) START MAIN CB AUTO RECLOSURE START TIE CB AUTO RECLOSURE

DISPLAY

C

E

REL 316 ACTIVE

START

TRIP

CARRIER SEND INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION COME) TO DISTURBANCE RECORDER TO EVENT RECORDER ( SOE/ SCADA ) TO LBB/BFR INITIATION

INITIATE MAIN CB GR-B 1-PH TRIP UNIT ( INTURN IT WILL TRIP 1-POLE ) INITIATE TIE CB GR-B 1-PH TRIP UNIT ( INTURN IT WILL TRIP 1-POLE ) START MAIN CB AUTO RECLOSURE START TIE CB AUTO RECLOSURE

DISPLAY

CARRIER SEND INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)

C

INITIATE ALARM (ANNUNCIATION COME)

E

TO EVENT RECORDER ( SOE/ SCADA )

TO DISTURBANCE RECORDER

TO LBB/BFR INITIATION

AUTO RECLOSURE

CONDITIONS REQUIRED FOR A/R OPERATION

1. 2. 3.

7. 8. 9.

CB CLOSE CONDITION. TIME LAPSED MORE THAN RECLAIM TIME. OPERATING PRESSURE OF CB SUITABLE FOR AUTORECLOSURE OPERATION. DC SUPPLY TO AUTORECLOSURE SHOULD BE AVAILABLE. PREPARE 33-PH TRIP RELAY SHOULD BE RELEASED CONDITION. NO BLOCKING SIGNAL TO AUTORECLOSURE RELAY. POLE DISTURBANCE RELAY TIME SHOULD BE MORE THAN TWICE OF DEAD TIME OF AUTO RECLOSURE. CARRIER FAIL SIGNAL SHOULD NOT COME AT BOTH ENDS. CARRIER SWITCH SHOULD BE IN SERVICE CONDITION. SINGLE PHASE & ZONE ZONE--1 FAULT ONLY.

AUTO RECLOSURE OPERATION

1. 2. 3. 4.

TRIP MAIN CB SINGLE POLE. TRIP TIE CB SINGLE POLE. CLOSE MAIN CB AFTER DEAD TIME. IF A/R SUCCESS FOR MAIN CB THEN AFTER SUPPLEMENTARY TIME DELAY CLOSE TIE CB.(NORMALLY SUPPLEMENTARY TIME DELAY IS DEAD TIME) IF A/R UNSUCCESS THEN TRIP MAIN & TIE CBs. IF MAIN CB OPEN CONDITION, THEN NO SUPPLEMENTARY DELAY TIME FOR TIE A/R. IT WILL OPERATE ITs OWN DEAD TIME.

4. 5. 6. 7.

5. 6.

MAIN-1/ MAINMAINMAIN-2 ZONE--1 & TWO / THREE PHASE FAULT ZONE INITIATE MAIN CB GR-A 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES )

REL 521 ACTIVE

START

TRIP

INITIATE TIE CB GR-A 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES ) BLOCK MAIN CB AUTO RECLOSURE BLOCK TIE CB AUTO RECLOSURE

DISPLAY

C

E

REL 316 ACTIVE

START

TRIP

CARRIER SEND INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION COME) TO DISTURBANCE RECORDER TO EVENT RECORDER ( SOE/ SCADA ) TO LBB/BFR INITIATION

INITIATE MAIN CB GR-B 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES ) INITIATE TIE CB GR-B 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES ) BLOCK MAIN CB AUTO RECLOSURE BLOCK TIE CB AUTO RECLOSURE

DISPLAY

CARRIER SEND INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)

C


E




MAIN-1/ MAINMAINMAIN-2 ZONE--2 & 1 / 2 / 3 PHASE FAULT ZONE INITIATE MAIN CB GR-A 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES ) CARRIER SIGNAL RECEIVED & ZONE-2 STARTER IS PICKUP CONDITION

REL 521 ACTIVE

START

TRIP

BLOCK MAIN CB AUTO RECLOSURE BLOCK TIE CB AUTO RECLOSURE

DISPLAY

C

E

CARRIER SIGNAL RECEIVED & ZONE-2 STARTER IS PICKUP CONDITION

INITIATE TIE CB GR-A 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES )

REL 316 ACTIVE

START

TRIP

TO LBB/BFR INITIATION INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION CAME) TO DISTURBANCE RECORDER TO EVENT RECORDER ( SOE/ SCADA )


DISPLAY

CARRIER SEND ( IF PUTT OR2 SCHEME SELECTED ) INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)

C


E




MAIN-1/ MAINMAINMAIN-2 ZONE-- 3/4/5 & 1 / 2 / 3 PHASE FAULT ZONE INITIATE MAIN CB GR-A 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES )

REL 521 ACTIVE

START

TRIP

INITIATE TIE CB GR-A 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES ) BLOCK MAIN CB AUTO RECLOSURE BLOCK TIE CB AUTO RECLOSURE

DISPLAY

C

E

REL 316 ACTIVE

START

TRIP

TO LBB/BFR INITIATION INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION CAME) TO DISTURBANCE RECORDER TO EVENT RECORDER ( SOE/ SCADA )


DISPLAY

TO LBB/BFR INITIATION INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)

C


E



DISTANCE SCHEME TRIPPING OUTPUTS TIE CB

MAIN CB 186 R

CO

CO

REL 521

TO TRIP COIL-1 TO TRIP COIL-2

ACTIVE

START


TRIP

186 Y

186 Y

DISPLAY



C 186 B

186 B

E

TO TRIP COIL-1 TO TRIP COIL-2 286 R

CO

TO TRIP COIL-1 TO TRIP COIL-2 CO

286 R

REL 316


ACTIVE

START


TRIP

286 Y

286 Y

DISPLAY

TO TRIP COIL-1 TO TRIP COIL-2 286 B TO TRIP COIL-1 TO TRIP COIL-2

186 R

C

E

TO TRIP COIL-1 TO TRIP COIL-2 286 B TO TRIP COIL-1 TO TRIP COIL-2

TRANSFORMER PROTECTION (DIFFERENCIAL & REF / 33-PH HZ DIFF PROTECTION) INITIATE 400KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

RET 521 ACTIVE

87 T1

START

TRIP

INITIATE 400KV TIE CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE 220KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE 220KV TBC CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

DISPLAY

(LZ)

C

INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION COME) TO EVENT RECORDER ( SOE/ SCADA )

E

RET 316

87 T2 (LZ/HZ)

ACTIVE

START

TRIP

INITIATE 400KV MAIN CB GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE 400KV TIE CB GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE 220KV MAIN CB GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE 220KV TBC CB GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

DISPLAY

INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION COME)

C

E


TRANSFORMER PROTECTION ( BACKUP DIRECTIONAL O/L & E/F PROTECTION FOR HV & LV)

INITIATE 400KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

REF 610

67 HV ABCN

ACTIVE

START

TRIP


DISPLAY

C


E

REX 521 ACTIVE

67 LV ABCN

START

TRIP


DISPLAY


C

E


MAIN LBB

INITIATION 1-PH TRIP RELAYS OF MAIN-1 PROTECTION

INITIATE BUSBAR PROTECTION ( INTURN IT WILL TRIP CONNECTED BUS CBs)

REQ 650 ACTIVE

START

TRIP

DIRECT TRANSFER TRIP-2 CARRIER SEND TO OTHER END

DISPLAY 86-GR-A MASTER TRIP RELAY

CLOSE INTERLOCK OF MAIN CB & TIE CB INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)

C

86-GR-B MASTER TRIP RELAY

INITIATE ALARM (ANNUNCIATION COME) TO DISTURBANCE RECORDER

E

96 BB BUSBAR RELAY


TIE LBB

INITIATION

1-PH TRIP RELAYS OF MAIN-2 PROTECTION OF LINE-1 (BAY1) & LINE-2 (BAY 3)

BLOCK MAIN CB & TIE CB AUTO RECLOSURE DIRECT TRANSFER TRIP-1 CARRIER SEND TO OTHER END

1-PH TRIP RELAYS OF MAIN-2 PROTECTION

1-PH TRIP RELAYS OF MAIN-1 PROTECTION OF LINE-1(BAY1) & LINE-2 (BAY3)

INITIATE TIE CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT (TRIP BAY1 CB 3-POLES )

REQ 650 ACTIVE

START

TRIP

INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT ( TRIP BAY3 CB 3-POLES ) BLOCK MAIN CB OF BAY1 & BAY3 AUTO RECLOSURE BLOCK TIE CB AUTO RECLOSURE CLOSE INTERLOCK OF MAIN CB OF BAY1 & BAY 3 CLOSE INTERLOCK OF TIE CB

DISPLAY

DIRECT TRANSFER TRIP-1 CARRIER SEND TO BAY1 & BAY3 LINES DIRECT TRANSFER TRIP-2 CARRIER SEND TO BAY1 & BAY3 LINES

86-GR-A MASTER TRIP RELAY

C 86-GR-B MASTER TRIP RELAY

INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION COME) TO DISTURBANCE RECORDER (BAY1 & BAY3)

E


MAIN LBB

INITIATION

INITIATE BUSBAR PROTECTION ( INTURN IT WILL TRIP CONNECTED BUS CBs)

86-GR-A MASTER TRIP RELAY 86-GR-B MASTER TRIP RELAY

RAICA ACTIVE

START

TRIP

INITIATE TIE CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INTER TRIP TO 220KV LV MAIN CB INTER TRIP TO 220KV LV TBC CB CLOSE INTERLOCK OF MAIN CB & TIE CB

96 BB BUSBAR RELAY

DISPLAY


C


E

TIE LBB

INITIATION 1-PH TRIP RELAYS OF MAIN-1 PROTECTION OF LINE-1(BAY1)

1-PH TRIP RELAYS OF MAIN-2 PROTECTION OF LINE-1 (BAY1)

INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT (TRIP BAY1 CB 3-POLES )

RAICA ACTIVE

START

TRIP

INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT ( TRIP BAY3 CB 3-POLES ) BLOCK MAIN CB OF BAY1 AUTO RECLOSURE BLOCK TIE CB AUTO RECLOSURE CLOSE INTERLOCK OF MAIN CB OF BAY1 & BAY 3 CLOSE INTERLOCK OF TIE CB

DISPLAY

DIRECT TRANSFER TRIP-1 CARRIER SEND TO BAY1 & BAY3 LINES DIRECT TRANSFER TRIP-2 CARRIER SEND TO BAY1 & BAY3 LINES

86-GR-A MASTER TRIP RELAY

C 86-GR-B MASTER TRIP RELAY

INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION COME) TO DISTURBANCE RECORDER (BAY1)

E


LBB IS PART OF DISTRIBUTED ARCHITECTURE 286-B

286-Y

286-R

186-B

186-Y

186-R

MAIN CB (LINE SIDE) LBB & BUSBAR INPUT & OUTPUTS

M_CB OPEN TO DIRECT TRIP SEND CH1 (LBB OPTD)

M_CB CLOSE

TO DIRECT TRIP SEND CH2 (LBB OPTD)

BUS ISO OPEN

TO DIRECT TRIP SEND CH1 (BB OPTD) BUS ISO CLOSE

TO DIRECT TRIP SEND CH2 (BB OPTD)

T_CB OPEN

TO TIE LBB TRIP RELAY (50ZTX/96TIE) TO TC-1

T_CB CLOSE

96-B CB CLOSE PULSE

96-A

86-B

86-A

TIE LBB OPTD

96 HIGH SPEED MASTER TRIP RELAY

TO TC-2 TO TC-1 TO TC-2 TO 21 L1 (DR) TO 21 L2 (DR) TO CLOSE I/L TO BAY UNIT TO BCU (SOE & A/R BLK)


286-Y

286-R

186-B

186-Y

186-R

TIE CB LBB INPUT & OUTPUTS ABB Network Partner AG

C E ABB Network Partner AG

REL 316*4

T_CB OPEN

T_ ISO1 OPEN

9

10

3

11

4

12

5

13

6

14

7

15

8

16

TO DIRECT TRIP SEND CH1 (LINE RE SIDE) TO DIRECT TRIP SEND CH2 (LINE RE SIDE) TO INTER TRIP SEND CH1 (ICT LV SIDE)

T_ISO1 CLOSE T_ISO2 OPEN C

T_ISO2 CLOSE E

M_L LBB OPTD

50ZTX CB CLOSE PULSE

86-B

86-A

M_T LBB OPTD

TO INTER TRIP SEND CH2(ICT LV SIDE) TO M_L LBB TRIP RELAY (96 M_L CB) TO M_T LBB TRIP RELAY (96 M_T CB) TO TC-1 TO TC-2 96 HIGH SPEED MASTER TRIP RELAY

T_CB CLOSE

1

2

TO TC-1 TO TC-2 TO 21 L1 (DR M_L) TO 21 L2 (DR M_T) TO CLOSE I/L TO BAY UNIT TO BCU (SOE & A/R BLK) TO 87 T1 (DR M_L) TO 87 T2 (DR M_T)

LBB IS PART OF DISTRIBUTED ARCHITECTURE MAIN CB (ICT SIDE) LBB & BUSBAR INPUT & OUTPUTS

M_CB OPEN M_CB CLOSE

TO INTERTRIP TRIP SEND CH1 (LBB OPTD)

BUS ISO OPEN

TO INTERTRIP SEND CH2 (LBB OPTD)

BUS ISO CLOSE

TO INTERTRIP SEND CH1 (BB OPTD)

T_CB OPEN

TO INTERTRIP SEND CH2 (BB OPTD) TO TIE LBB TRIP RELAY (50ZTX/96TIE) TO TC-1

T_CB CLOSE

TIE LBB OPTD LV M_LBB OPTD 96-B CB CLOSE PULSE

96-A

86-B

86-A

LV T_LBB OPTD


TO TC-2 TO TC-1 TO TC-2 TO 87 T1 (DR) TO 87 T2 (DR) TO CLOSE I/L TO BAY UNIT TO BCU (SOE)


286-Y

286-R

186-B

186-Y

186-R

MAIN CB (DBT SYSTEM) LBB & BUSBAR INPUT & OUTPUTS

M_CB OPEN M_CB CLOSE TO DIRECT TRIP SEND CH1 (LBB OPTD)

BUS1 ISO OPEN

TO DIRECT TRIP SEND CH2 (LBB OPTD)

BUS1 ISO CLOSE

TO DIRECT TRIP SEND CH1 (BB OPTD) BUS2 ISO OPEN

TO DIRECT TRIP SEND CH2 (BB OPTD)

BUS2 ISO CLOSE

TO TBC LBB TRIP RELAY (96TBC) TO TC-1

BUS3 ISO OPEN

96-B CB CLOSE PULSE

96-A

86-B

86-A

TBC LBB OPTD


TO TC-2

BUS3 ISO CLOSE

TO TC-1 TO TC-2 TO 21 L1 (DR) TO 21 L2 (DR) TO CLOSE I/L TO BAY UNIT TO BCU (SOE & A/R BLK)

BUS BAR PROTECTION INITIATE ALL CBs TRIP UNITS CONNECTED TO THIS BUS AND OPERATE. TO TRIP COIL-1 CONCERNED BAY CB

REB 500 ACTIVE

START

TRIP

TO TRIP COIL-2 CONCERNED BAY CB TO CLOSE CIRCUIT INTERLOCK OF CONCERN CB DIRECT TRIP SEND CHANNEL-1 TO OTHER END DIRECT TRIP SEND CHANNEL-2 TO OTHER END

DISPLAY

TO LBB/BFR INITIATION FROM LBB/BFR TO BUS BAR TRIPPING

C

TO DISTURBANCE RECORDER OF MAIN-1 TO DISTURBANCE RECORDER OF MAIN-2

E

TO EVENT RECORDER ( SOE/ SCADA ) INITIATE ALARM (ANNUNCIATION COME)

INITIATE ALL CBs TRIP UNITS CONNECTED TO THIS BUS AND OPERATE. TO TRIP COIL-1 CONCERNED BAY CB

REB 670 ACTIVE

START

TRIP

TO TRIP COIL-2 CONCERNED BAY CB TO CLOSE CIRCUIT INTERLOCK OF CONCERN CB DIRECT TRIP SEND CHANNEL-1 TO OTHER END DIRECT TRIP SEND CHANNEL-2 TO OTHER END

DISPLAY

TO LBB/BFR INITIATION FROM LBB/BFR TO BUS BAR TRIPPING

C

TO DISTURBANCE RECORDER OF MAIN-1 TO DISTURBANCE RECORDER OF MAIN-2

E

TO EVENT RECORDER ( SOE/ SCADA ) INITIATE ALARM (ANNUNCIATION COME)

BUSBAR--1 PROTECTION TRIPPING SCHEME BUSBAR HIGH SPEED TRIP RELAY FOR 1-52 CB

1-52 CB PANEL TRIP FROM 50 LBB TO START 50 LBB

4-52 CB PANEL

HIGH SPEED TRIP RELAY FOR 4-52 CB

TRIP FROM 50 LBB TO START 50 LBB

7-52 CB PANEL HIGH SPEED TRIP RELAY FOR 7-52 CB



1010-52 CB PANEL TRIP FROM 50 LBB

1-52 CB PANEL TO CLOSE CKT INTERLOCK TO BLOCK A/R TO TRIP COIL-1 TO TRIP COIL-2 DIRECT TRIP SEND CH-1 DIRECT TRIP SEND CH-2 TO DISTURBENCE RECORDER



10 10--52CB PANEL TO CLOSE CKT INTERLOCK TO BLOCK A/R TO TRIP COIL-1 TO TRIP COIL-2 DIRECT TRIP SEND CH-1 DIRECT TRIP SEND CH-2 TO DISTURBENCE RECORDER

TO START 50 LBB



1616-52 CB PANEL



+VE

BUSBAR PANEL

13 13--52 CB PANEL TO CLOSE CKT INTERLOCK TO BLOCK A/R TO TRIP COIL-1 TO TRIP COIL-2 DIRECT TRIP SEND CH-1 DIRECT TRIP SEND CH-2 TO DISTURBENCE RECORDER


BUSBAR--2 PROTECTION TRIPPING SCHEME BUSBAR HIGH SPEED TRIP RELAY FOR 3-52 CB


6-52 CB PANEL



9-52 CB PANEL HIGH SPEED TRIP RELAY FOR 9-52 CB



1212-52 CB PANEL TRIP FROM 50 LBB




12 12--52CB PANEL TO CLOSE CKT INTERLOCK TO BLOCK A/R TO TRIP COIL-1 TO TRIP COIL-2 DIRECT TRIP SEND CH-1 DIRECT TRIP SEND CH-2 TO DISTURBENCE RECORDER

TO START 50 LBB



1818-52 CB PANEL



+VE

BUSBAR PANEL



STUB PROTECTION INITIATE MAIN CB 86-GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

REL 521 ACTIVE

LINE /AT/F ISOLATOR OPENS

START

TRIP


DISPLAY

C

E

REL 316 ACTIVE

LINE /AT/F ISOLATOR OPENS

INITIATE TIE CB 86-GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

START

TRIP

CLOSE INTERLOCK OF MAIN CB CLOSE INTERLOCK OF TIE CB INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION COME) TO DISTURBANCE RECORDER TO EVENT RECORDER ( SOE/ SCADA )

INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE TIE CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) BLOCK MAIN CB AUTO RECLOSURE BLOCK TIE CB AUTO RECLOSURE

DISPLAY

CLOSE INTERLOCK OF MAIN CB CLOSE INTERLOCK OF TIE CB

C

INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)

E




TEED PROTECTION INITIATE MAIN CB 86-GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

RET 521

87 T1 (HZ)

ACTIVE

START

TRIP

DISPLAY

E

RET 670

(LZ)


C

87 T2


ACTIVE

START

TRIP



DISPLAY


C


E




MAIN-1/ MAINMAINMAIN-2 OVER VOLTAGE STAGESTAGE-1 INITIATE MAIN CB 86-GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) 110% OF V 4 SECS FOR FEEDER-1 5 SECS FOR FEEDER-2

REL 521 ACTIVE

START

TRIP

BLOCK MAIN CB & TIE CB AUTO RECLOSURE DIRECT TRANSFER TRIP-1 CARRIER SEND TO OTHER END

DISPLAY

C

E

110% OF V 4 SECS FOR FEEDER-1 5 SECS FOR FEEDER-2


REL 316 ACTIVE

START

TRIP

DIRECT TRANSFER TRIP-2 CARRIER SEND TO OTHER END CLOSE INTERLOCK OF MAIN CB & TIE CB INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION COME) TO DISTURBANCE RECORDER TO EVENT RECORDER ( SOE/ SCADA )

INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE TIE CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) BLOCK MAIN CB & TIE CB AUTO RECLOSURE DIRECT TRANSFER TRIP-1 CARRIER SEND TO OTHER END

DISPLAY

DIRECT TRANSFER TRIP-2 CARRIER SEND TO OTHER END CLOSE INTERLOCK OF MAIN CB & TIE CB

C


E




OVER VOLTAGE STAGESTAGE-2 INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

REU 521 ACTIVE

START

TRIP

INITIATE TIE CB 86-GR-B 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) BLOCK MAIN CB & TIE CB AUTO RECLOSURE DIRECT TRANSFER TRIP-1 CARRIER SEND TO OTHER END

120% OF V 20m SECS

DISPLAY

C

E

DIRECT TRANSFER TRIP-2 CARRIER SEND TO OTHER END CLOSE INTERLOCK OF MAIN CB & TIE CB INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION COME) TO DISTURBANCE RECORDER (MAIN-1 & MAIN-2) TO EVENT RECORDER ( SOE/ SCADA )

UNDER VOLTAGE RELAY REU 521 ACTIVE

1O% OF V

START

TRIP

DISPLAY

C

E

LINE EARTH SWITCH CLOSE PERMISSION ONLY.

CARRIER TRIPPING SCHEMES(TELEPROTECTION) DETAILS

PERMISSIVE TRIPPING

CHANNEL-1 CHANNELSEND

MAIN-1 PROTECTION : MAINIT SENDS SIGNAL PARALLEL VIA PLCC PROTECTION COUPLER PANEL-1 AS A MAIN CHANNEL & PLCC PROTECTION COUPLER PANEL-2 AS A ALTERNATE CHANNEL..

CHANNEL-2 CHANNELSEND

DIRECT TRIPPING

HERE CHANNEL-1 & CHANNEL-2 SIGNALS ARE MAIN & ALTERNATE CHANNEL 1. TIE CB OPEN CONDITION + MAIN CB REMOTE HAND TRIP GIVEN. 2. MAIN CB OPEN CONDITION + TIE CB REMOTE HAND TRIP GIVEN. 3. TIE CB OPEN CONDITION + 87 BUSBAR-1 OPERATED. 4. MAIN CB OPEN CONDITION + 87 BUSBAR-2 OPERATED (FOR HALF DIA ONLY). MAIN--2 PROTECTION : MAIN 5. MAIN CB 50 LBB/BFR OPERATED. IT SENDS SIGNAL PARALLEL VIA 6. TIE CB 50 LBB/BFR OPERATED. PLCC PROTECTION COUPLER PANEL-2 AS A MAIN CHANNEL & 7. 59L1 OVER VOLTAGE STAGE-1 OPERATED. PLCC PROTECTION COUPLER PANEL-1 AS A ALTERNATE 8. 59L2 OVER VOLTAGE STAGE-2 OPERATED. CHANNEL. 9. 87 TEED-1 PROTECTION OPERATED 10. 87 TEED-2 PROTECTION OPERATED

CHANNEL-1 CHANNELRECEIVE

MAIN-1 PROTECTION : MAIN1. TO 86-A MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR MAIN CB. IT RECEIVES SIGNAL PARALLEL VIA 2. TO 86-A MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR TIE CB. PLCC PROTECTION COUPLER PANEL-1 AS A MAIN CHANNEL & PLCC PROTECTION COUPLER PANEL-2 AS A ALTERNATE CHANNEL.

CHANNEL-2 CHANNELRECEIVE

MAIN-2 PROTECTION : MAIN1. TO 86-B MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR MAIN CB. IT RECEIVES SIGNAL PARALLEL VIA PLCC PROTECTION COUPLER PANEL-2 AS A MAIN CHANNEL & 2. TO 86-B MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR TIE CB. PLCC PROTECTION COUPLER PANEL-1 AS A ALTERNATE CHANNEL.

CARRIER TRIPPING SCHEMES(TELEPROTECTION) 21 M1 – REL 521 ABB Network Partner AG

REL531

CARRIER PROTECTION PANEL-1

CARRIER PROTECTION PANEL-1

PT SEND

PT SEND

21 M1 – REL 521 ABB Network Partner AG

REL531

C

E

DIRECT TRIP SEND CH-1 MAIN CB 86-A TIE CB 86-A

21 M2 REL 316 ABB Network Partner AG

1

9

2 3 4 5 6

10 11 12 13 14

7 8

15 16

C

PT RECEIVE

PT RECEIVE

PT SEND

PT SEND

PT RECEIVE

PT RECEIVE

DT SEND

DT SEND

DT RECEIVE

DT RECEIVE

ONE END CARRIER PROTECTION PANEL-2

REC 316*4

C

OTHER END CARRIER PROTECTION PANEL-2

PT SEND

PT SEND

PT RECEIVE

PT RECEIVE

E

DIRECT TRIP SEND CH-1 MAIN CB 86-A TIE CB 86-A

21 M2 REL 316 ABB Network Partner AG

1

9

2 3 4 5 6

10 11 12 13 14

7 8

15 16

REC 316*4

C

E

PT SEND

PT SEND

DIRECT TRIP SEND CH-2

PT RECEIVE

PT RECEIVE

DT SEND

DT SEND

MAIN CB 86-B

DT RECEIVE

DT RECEIVE

TIE CB 86-B

E

PT : PERMISSIVE PROTECTION TRANSFER TRIP DT : DIRECT TRANSFER TRIP

DIRECT TRIP SEND CH-2 MAIN CB 86-B TIE CB 86-B

DIRECT TRANSFER TRIP CHANNEL – 1 / 2 RECEIVED INITIATE MAIN CB 86-GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

85 LO X1 ACTIVE

DIRECT TRIP CHANNEL-1 RECEIVED

START

TRIP


DISPLAY

C

E

85 LO X2 ACTIVE

DIRECT TRIP CHANNEL-2 RECEIVED.


START

TRIP



DISPLAY


C


E




TRANSFORMER PROTECTION ( OVER FLUX PROTECTION FOR HV & LV) INITIATE 400KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

RALK

99T HV

ACTIVE

START

INITIATE 400KV TIE CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

TRIP

INITIATE 220KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE 220KV TBC CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

DISPLAY

C


E

RATUB ACTIVE

99T LV

START

TRIP


DISPLAY


C

E


TRANSFORMER PROTECTION INITIATE 400KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

RXIG 21

51 O/L

ACTIVE

START

TRIP


DISPLAY

C


E

RAEDK1 ACTIVE

NDR

START

TRIP

INITIATE 400KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE 400KV TIE CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE 220KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE 220KV TBC CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )

DISPLAY


C

E


OVER VOLTAGE (LINE) AND OVER FLUX(ICT ) PROTECTION TRIP SCHEME 86 86--A MTR/ HSTR

ABB O/V – 1 O/V – 2

86 86--A MTR/ HSTR

ABB RALK O/F-- HV O/F (BAY 2&3 / HV)

(BAY 1&2)

TRIP COIL-1 1-52CB TRIP COIL-2 BUS-1 86 86ABB -B REL521 MTR/ MAINMAIN HSTR -1

TRIP COIL-1 2-52CB

TRIP COIL-1

TRIP COIL-2

TRIP COIL-2 BUS-2

3-52CB

(BAY 1&2)

ABB O/V – 1 O/V – 2

OVER VOLTAGE STAGE-1 & STAGE-2 ARE IN BUILT FUNCTIONS OF MAIN-1 & MAIN-2 LINE DISTANCE RELAYS. HV OVER FLUX IS INBUILT FUNCTION OF MAIN-1 ICT DIFFERENTIAL RELAY LV OVER FLUX IS INBUILT FUNCTION OF MAIN-2 ICT DIFFERENTIAL RELAY

86 86--A MTR/ HSTR

86 86--B MTR/ HSTR

86 86--B MTR/ HSTR

TRIP COIL-2

86 86--B MTR/ HSTR

LV - CB (BAY LV)

ABB RATUB O/F-- LV O/F

TRIP COIL-1

86 86--A MTR/ HSTR

MAIN CB

SOTF PROTECTION (INBUILT MAIN-1) DEF,TOC, BOC, STUB (INBUILT MAIN-1) TEED-1 PROTECTION

OVER VOLTAGE STAGE-1 ( IN BUILT MAIN-2 )

86 86--GB MASTER TRIP / HIGH SPEED TRIP RELAY

DIRECT TRIP CHANNEL-2 RECEIVED SOTF PROTECTION ( IN BUILT MAIN-2 ) OVER VOLTAGE STAGE-2 DEF, TOC, BOC, STUB ( IN BUILT MAIN-2 ) MAIN LBB OPERATED TIE LBB OPERATED TEED-2 PROTECTION


TRIP COIL -2

TRIP COILCOIL-2

DIRECT TRIP CHANNEL-1 RECEIVED

86 86--GA MASTER TRIP / HIGH SPEED TRIP RELAY

TIE CB


OVER VOLTAGE STAGE-1 (INBUILT MAIN-1)

TRIP COILCOIL-1

TRIP COIL -1

86 86--GA & 86 GB MASTER TRIP / HIGH SPEED TRIP LOCKOUT RELAY OPERATION

MAIN CB

INTER TRIP FROM LV SIDE ICT TROUBLES GR-A PROTECTION TRIP ICT HV OVER FLUX RELAY

RESTRICTED EARTH FAULT RELAY 64 REF/T


INTER TRIP FROM LV SIDE ICT TROUBLES GR-B PROTECTION TRIP STUB RELAY 50ST MAIN LBB OPERATED TIE LBB OPERATED ICT LV OVER FLUX RELAY INTER TRIP FROM TBC LBB & MANUAL TRIP OF 220KV


TRIP COIL -2

TRIP COILCOIL-2

B/U O/C & E/F PROTN RLY 67 ABCN


TIE CB


T/F DIFFERENTIAL RELAY 87 T

TRIP COILCOIL-1

TRIP COIL -1

86 86--GA & 86 GB MASTER TRIP / HIGH SPEED TRIP LOCKOUT RELAY OPERATION

MASTER TRIP RELAYS HIGH SPEED TRIP RELAYS LOCKOUT RELAYS PUSH BUTTON FOR RESETTING.

PUSH BUTTON FOR RESETTING.

TO CLOSING INTERLOCK OF CONCERNED BAY CB


TO INITIATE LBB/BFR OF CONCERNED BAY BLOCK AUTO RECLOSURE OF CONCERNED BAY TO TRIP COIL-1 CONCERNED BAY CB TO TRIP COIL-2 CONCERNED BAY CB INITIATE FLAG RELAY (FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION COME) TO DISTURBANCE RECORDER (MAIN-1 & MAIN-2) TO EVENT RECORDER ( SOE/ SCADA )

TO CLOSING INTERLOCK OF CONCERNED BAY CB


TO INITIATE LBB/BFR OF CONCERNED BAY BLOCK AUTO RECLOSURE OF CONCERNED BAY TO TRIP COIL-1 CONCERNED BAY CB TO TRIP COIL-2 CONCERNED BAY CB INITIATE FLAG RELAY (FLAG RELAY OPERATES) INITIATE ALARM (ANNUNCIATION COME) TO DISTURBANCE RECORDER (MAIN-1 & MAIN-2) TO EVENT RECORDER ( SOE/ SCADA )

AUTO TRANSFORMER INTER TRIP CIRCUITS HV INTER TRIP CIRCUITS(TO LV) FOR LV MASTER TRIP RELAY 86 GR-A 1. TIE CB OPEN CONDITION + MAIN CB REMOTE HAND TRIP GIVEN. 2. MAIN CB OPEN CONDITION + TIE CB REMOTE HAND TRIP GIVEN. 3. TIE CB OPEN CONDITION + 96 BUSBAR-1 OPERATED. 4. MAIN CB OPEN CONDITION + 96 BUSBAR-2 OPERATED (FOR HALF DIA ONLY). 5. MAIN CB 50 LBB/BFR OPERATED. 6. TIE CB 50 LBB/BFR OPERATED. 7. 87 TEED-1 PROTECTION OPERATED 8. 87 TEED-2 PROTECTION OPERATED. FOR LV MASTER TRIP RELAY 86 GR-B 1. TIE CB OPEN CONDITION + MAIN CB REMOTE HAND TRIP GIVEN. 2. MAIN CB OPEN CONDITION + TIE CB REMOTE HAND TRIP GIVEN. 3. TIE CB OPEN CONDITION + 96 BUSBAR-1 OPERATED. 4. MAIN CB OPEN CONDITION + 96 BUSBAR-2 OPERATED (FOR HALF DIA ONLY). 5. MAIN CB 50 LBB/BFR OPERATED. 6. TIE CB 50 LBB/BFR OPERATED. 7. 87 TEED-1 PROTECTION OPERATED 8. 87 TEED-2 PROTECTION OPERATED.

LV INTER TRIP CIRCUIT(TO HV)

FOR HV M-CB MASTER TRIP RELAY 86 GR-A 1. LV CB REMOTE HAND TRIP GIVEN. 2. LV 87 BB(96) BUSBAR-1/2 (ISO SELECTION) OPERATED. 3. LV CB 50 LBB/BFR OPERATED. FOR HV M-CB MASTER TRIP RELAY 86 GR-B 1. LV CB REMOTE HAND TRIP GIVEN. 2. LV 87 BB(96) BUSBAR-1/2 (ISO SELECTION) OPERATED. 3. LV CB 50 LBB/BFR OPERATED. FOR HV T-CB MASTER TRIP RELAY 86 GR-A 1. LV CB REMOTE HAND TRIP GIVEN. 2. LV 87 BB(96) BUSBAR-1/2 (ISO SELECTION) OPERATED. 3. LV CB 50 LBB/BFR OPERATED. FOR HV T-CB MASTER TRIP RELAY 86 GR-B 1. LV CB REMOTE HAND TRIP GIVEN. 2. LV 87 BB(96) BUSBAR-1/2 (ISO SELECTION) OPERATED. 3. LV CB 50 LBB/BFR OPERATED.

TRANSFORMER TROUBLES TRIPPING GRGR-A 86 AX

OIL TEMP TRIP

TO 3PH GR-A 400KV MAIN CB TO 3PH GR-A 400KV TIE CB

DIFF RELAY 87T

TO 3PH GR-A 220KV MAIN CB

BUCHHOLZ TRIP

TO 3PH GR-A 220KV TBC CB

OL RELAY 51OL PRD-1 TRIP

HV O/L+E/F PROT 67 PRD-2 TRIP

NDR RELAY 151N

HV O/F RELAY 99T

86 AY

TRANSFORMER TROUBLES TRIPPING GRGR-B 86 BX

OLTC BUCHHOLZ-R TRIP TO 3PH GR-B 400KV MAIN CB TO 3PH GR-B 400KV TIE CB

OLTC BUCHHOLZ-Y TRIP

REF RELAY 64REF

TO 3PH GR-B 220KV MAIN CB TO 3PH GR-B 220KV TBC CB

STUB RELAY 50ST OLTC BUCHHOLZ –B TRIP

LV O/L+E/F PROT 67 WNDG TEMP-HV TRIP

LV O/F RELAY 99T WNDG TEMP-LV TRIP

WNDG TEMP-IV TRIP

86 BY

TRIP COILCOIL-1 CIRCUITS TRIP COIL-1 186R1

186Y1

186B1

186R2

186Y2

186B2

286R1

286Y1

286B1

286R2

286Y2

286B2

186R1, 186R2, 186Y1, 186Y2, 186B1, 186B2 ARE CB 1-PH TRIP UNIT OF GR-A. THESE ARE SELF RESETING. 286R1, 286R2, 286Y1, 286Y2, 286B1, 286B2 ARE CB 1-PH TRIP UNIT OF GR-B. THESE ARE SELF RESETING. THE BELOW ARE HAND RESETING. 86GR-A, 86GR-B ARE 3-PH TRIP UNITS. 96 BB IS BUSBAR TRIPPING RELAY

86GR-A

.

.

.

86GR-B

.

96BB

.

.

TRIP COIL – 2 CIRCUITS TRIP COIL-2 186R1

186Y1

186B1

186R2

186Y2

186B2

286R1

286Y1

286B1

286R2

286Y2

286B2

186R1, 186R2, 186Y1, 186Y2, 186B1, 186B2 ARE CB 1-PH TRIP UNIT OF GR-A. THESE ARE SELF RESETING. 286R1, 286R2, 286Y1, 286Y2, 286B1, 286B2 ARE CB 1-PH TRIP UNIT OF GR-B. THESE ARE SELF RESETING. THE BELOW ARE HAND RESETING. 86GR-A, 86GR-B ARE 3-PH TRIP UNITS. 96 BB IS BUSBAR TRIPPING RELAY

86GR-A

.

.

.

86GR-B

.

96BB

.

.

ISOLATOR INTERLOCKS

S.NO

ISOLATOR OPEN/CLOSE

EQUIPMENT--1 EQUIPMENT

EQUIPMENT EQUIPMENT--2



INTERLOCKS REQUIRED FOR CONCERNED ISOLATOR / EARTH SWITCH OPEN OR CLOSE

BAY - 1

NOTE: All Earth Switches in the Bay are towards Circuit Breaker side only. The Line and Transformer Earth Switches are towards Line & Transformer. O: OPEN C: CLOSE A: ACTED

BB189E : BUSBARBUSBAR-1 EARTH SWITCH . BB289E : BUSBARBUSBAR-2EARTH SWITCH . UV RELAY: UNDER VOLTAGE RELAY.

1

1 - 89

ISO

BB189 E

O

189 AE

O

189 E

O

152 CB

O

2

1 – 89 E

ES

189 A

O

189

O

--

-

--

-

3

1 – 89 A

ISO

189 AE

O

189 E

O

152 CB

O

--

-

4

1 – 89 AE

ES

189 A

O

189

O

--

-

--

-

5

1 – 89 L

ISO

189 LE

O

152 CB

O

252 CB

O

--

-

6

1 – 89 LE

ES

189 L

O

UV RELAY

A

--

-

--

-

7

2 – 89 A

ISO

289 BE

O

289 AE

O

252 CB

O

--

-

8

2 – 89 AE

ES

289 B

O

289 A

O

--

-

--

-

9

2 – 89 B

ISO

289 BE

O

289 AE

O

252 CB

O

--

-

10

2 – 89 BE

ES

289 B

O

289 A

O

--

-

--

-

11

3 – 89

ISO

BB289 E

O

389 AE

O

389 E

O

352 CB

O

12

3 – 89 E

ES

389 A

O

389

O

--

-

--

-

13

3 – 89 A

ISO

389 AE

O

389 E

O

352 CB

O

--

-

14

3 – 89 AE

ES

389 A

O

389

O

--

-

--

-

15

3 – 89 T

ISO

LV89 E2

O

389 TE

O

252 CB

O

352 CB

O

16

3 – 89 TE

ES

389 T

O

LV89 T

O

--

-

--

-

BAY - 2

BAY - 3

BB189E 1-89AE 1-89E 1-52CB 1-52CB 1-89AE 1-89E

1-52CB 1-89LE 2-52CB 1-89 1-89A 1-89 1-89A 1-89L U/V RLY

ISOLATOR & CB INTERLOCKS

OPEN OPEN OPEN

&

OPEN OPERATION

1-89

1-89E

OPEN

1-89AE

OPEN

2-89AE

OPEN

&

OPERATION

1-89A

2-89BE

OPEN 3-89E 3-89AE

OPEN OPEN

&

OPERATION

86GR-A

1-89L

86GR-B

OPEN

96BB

2-89AE 2-89BE

CLOSE CLOSE CLOSE CLOSE CLOSE CLOSE RESET RESET RESET

LOCAL CLOSE

& 1-52CB

3-89

OPERATION

&

LOCAL CLOSE

& 2-52CB

OPEN 3-89A

OPERATION

&

LOCAL CLOSE

& 3-52CB REMOTE CLOSE

& 1-52CB

OPEN

&

OPERATION

1-89E

86GR-A 86GR-B

OPEN OPEN

&

OPERATION

1-89AE

86GR-B

OPEN ACTED

86GR-A

&

OPERATION

1-89LE

96BB

OPEN OPEN OPEN

2-89B

&

OPERATION

2-89A

2-89A 2-89B

RESET RESET RESET RESET RESET

REMOTE CLOSE

& 2-52CB

OPEN

OPERATION

OPEN

&

3-89AE 3-89E 3-52CB 3-52CB 3-89AE

OPEN OPEN

3-89T

BB289E

OPEN OPEN

3-89E 3-52CB 3-89TE

OPEN OPEN

OPEN

2-89A 2-52CB

OPEN

2-52CB LV89E2

OPEN 3-89E

OPERATION

&

OPEN

3-89 3-89A

OPEN REMOTE CLOSE

& 3-52CB

3-89AE

3-89TE

OPERATION

OPERATION

&

OPEN OPEN

&

OPEN

3-89 3-89A 3-89T LV89T

OPEN OPEN

& 2-89AE

OPERATION

OPEN OPEN

OPERATION

& 2-89BE

2-52CB 2-89AE 2-89BE

OPEN OPEN OPEN

&

OPERATION

2-89B

CLOSING INTERLOCK OF MAIN & TIE CB 96 BB

86 GRGR-A

86 GRGR-B + VE T N C

21M1 AR

MAIN CB

SYN SOCKET

+ve

-ve

CB REMOTE CLOSE

CB AUTO RECLOSE

21M2 AR

86 GRGR-A

86 GRGR-B + VE T N C

TIE

AR

TIE CB

SYN SOCKET

+ve

-ve

CB REMOTE CLOSE

CB AUTO RECLOSE

OTHER INFORMATION REGARDING RELAYS AND TESTING EQUIPMENT PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

ABB RELAYS ABB Network Partner AG


REL 521

REL 316*4


1

9

2

10

3

11

4

12

5

13

6

14

7

15

8

16

C

C

C E

EE

ABB Relays ABB Network Partner AG

REL 512

c E

AREVA RELAYS

P445

P443

P437

E-PAC

P442

GE MULTILIN RELAYS

B90 – 87BB C60 – BCU D60 – 21L D90 – 21L

L60 – 87L L90 – 87L T60 – 87T D25 – BCU

F90 – 67/51 G60 – GEN M60 – MOTOR N90 – NETWORK

SIEMENS RELAYS

SEL RELAYS ENABLED TARGET RESET

TRIP

IA =250.10 A IB =250.10 A IC =250.10 A VAB =400.0 KV VBC =400.0 KV VCA =400.0 KV ESC

ENT

INST TIME COMM SOTF

1

INST TIME COMM SOTF ZONE 1 ZONE 2 ZONE 3 ZONE 4

PH - A PH - B PH - C GND 50 51 79 RESET 79 LOCKOUT

2ENABLED 3

4

ZONE

EN

A

B

C

G

FAULT TYPE

TARGET TARGET FAULT SET RESET NO / YES / CANCEL SELECT

Q

51

COMM ENABLED

RECLOSE ENABLED

ALT SETTINGS

CB CLOSED

RELAY TEST

CB OPEN

PROTECTION AUTOMATION CONTROL

50 O/C

METER STATUS OTHER GROUP EXIT

MC ENABLED

SEL- 321- 5 - 2

TARGET RESET

TRIP

TRIP

SPT ENABLED

SEL

SEL- 421 PROTECTION AUTOMATION CONTROL

SEL

VA TECH REYROLLE RELAYS

ERL PHASE RELAYS

RELAY HARDWARE 16 / 32 BIT

PC MODEM

IRIG-B RE/CC

NORMALLY 400KV RELAYS SUPPLIED WITH CONFIGUARATION/HARDWARE 1. MIN 4Nos MAX 8Nos COMMAND/TRIP OUTPUTS 2. MIN 24Nos SIGNAL OUTPUTS 3. MIN 14 LED INDICATIONS 4. MIN 24 BINARY INPUTS

FOLLOWING

RELAY SIGNAL DATA FLOW

FUNCTIONS AVAILABLE NUMERICAL DISTANCE RELAYS 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.

4 TO 6 SETTING IMPEDENCE ZONES WITH 4 TO 6 SETTING GROUPS (21 + 21N). DIR / INST / TIME OVERCURRENT & EARTH FAULT FUNCTION( 50 / 51 / 67 P+G). EIGHT COMMUNICATION SCHEMES. SWITCH ON TO FAULT PROTECTION(21 SOTF). PHASE SELECTION(R,Y,B). POWER SWING BLOCKING(PSB)(68 + 68T). FUSE FAILURE SUPERVISION(PT FFR). AUTO RECLOSER WITH CHECK SYNCHRNISATION & VOLTAGE CHECK(79 + 25 +86). WEEK END INFEED LOGIC(27 WI). SYSTEM SUPERVISION. STUB PROTECTION(STUB). OVER VOLTAGE/ UNDER VOLTAGE FUNCTION(27+ 59). LBB/BFR FUNCTION(50 BF). DISTANCE TO FAULT LOCATOR(21 FL).(SHOWS IN 1. %, 2. KM 3. MILES & 4. R+JX ) 16 PROGRAMABLE SIGNALLING RELAYS WITH LEDs. RECORDABLE 10Nos LATEST DISTRUBANCES WITH BASIC EVALUATION DISTURBANCE RECORDER. EVENT RECORDER RELATED TO RELAY EVENTS. PREPRE-FAULT, FAULT & POSTPOST-FAULT VALUES OF ANALOG POINTS WITH IMPEDENCE DETAILS. USER CAN BE CONFIGUARED PROGRAMABLE LOGIC FUNCTIONS. TELE / CARRIER INTER TRIPPING SCHEMES(85 +21)(PUTT, POTT). TRIP CIRCUIT MONITORING(74 TC). METERING FUNCTION (INSTANTANEOUS VALUES DISPLAY FUNCTION). 4 QUADRANT ENERGY METER FUNCTION (KWH,KVAH,KVARH)(KYZ PULSE OUTPUT). MINIMUM 8 COMMOND/ TRIP RELAYS, 24 SIGNAL RELAYS MINIMUM 20 BINARY INPUTS, 14 LEDs

DISTANCE RELAYS CHARACTERESTICS ( MHO CIRCULAR )

DISTANCE RELAYS CHARACTERESTICS ( QUADRILATERALQUADRILATERAL-1 )

DISTANCE RELAYS CHARACTERESTICS ( QUADRILATERALQUADRILATERAL-2 )

DISTANCE RELAYS CHARACTERESTICS ( BULLET )

DISTANCE RELAYS CHARACTERESTICS ( TRIANGLER )

DISTANCE RELAYS CHARACTERESTICS ( LENS / OPTICAL )

DISTANCE RELAYS CHARACTERESTICS ( TOMATO )

DISTANCE RELAYS CHARACTERESTICS ( PEANUT )

RELAY MODELS OF LINE (DISTANCE) & TRANSFORMER( M & B ) OF DIFFERENT MANUFACTURERS TRANSMISSION LINE PROTECTION MANUFACTURERS

T/F PROTECTION

MAIN--1 (21) MAIN

CURVES

MAIN--2 (87) MAIN

CURVES

DIFFERENTIAL

DIR O/L,E/F

ABB

REL 670

QUAD/ mho

RED 670

QUAD

RET 670

REF 6XX

ALSTOM (AREVA)

MICOM P446/P443

QUAD/ MHO

MICOM P545

QUAD/ MHO

MICOM P633 MICOM P643

MICOM P141

SIEMENS ( SIPROTEC )

SIPROTEC 7SA522

QUAD/ MHO

SIPROTEC 7SD532

QUAD/ MHO

7UT 613/ 2 7UT 513/ 2

7SJ 62/3/4/5 7SJ 52/3/4/5

VA TECH REYROLL

OHMEGA 402

QUAD/ MHO

OHMEGA 311/308

QUAD/ MHO

DUOBIAS M

ARGUS

GE MULTILIN

D-60, D-90 PLUS

QUAD/ MHO

L-60/L 60/L--90

QUAD/ MHO

T-35 / TT--60

F-60

SEL

SEL 421

MHO

SEL 487L

MHO

SEL 487T

SEL 351

ERL PHASE

L-PRO

QUAD/ MHO

L-PRO

LENS/ TOMAT0

T-PRO

F-PRO

IEC 61850 RELAY MODELS OF DIFFERENT MANUFACTURERS MANUFACTURERS

BCU CB CONTROL

FEEDER 67

DISTANCE 21

LINE DIFFERENTIAL DIFFERENTIAL 87 T 87 L

BUSBAR 87 BB

ABB

REC 670

REX 610

REL 670

RED 670

RET 670

AREVA

MICOM C264

MICOM P141

MICOM

MICOM P543/547

MICOM P633/P643

REB 670 REB 500 MICOM P74 1/3/6

L 60, L 90

T 60

B 90, B 30

SIPROTEC

SIPROTEC

SIPROTEC

P44 2/3/4

GE D 25 F 60 D 60, D 90 MULTILIN C 90 PLUS SIEMENS SIPROTEC SIPROTEC SIPROTEC ( SIPROTEC )

SEL TOSHIBA

6MD66/3

7SJ 62/3/4

7SA 522/6..

7SD 532/61_

7UT 633/13/2

7 SS 52

SEL 451-4 GBU 100/150

SEL 451

SEL 421/321 GRZ 100/150

SEL 387L GRL 100 / 150

SEL 487E GRT 100/150

SEL 487B GRB 100/150

GRD 140

RELAY TESTING EQUIPMENTS 1. PROGRAMA_GE (MODEL: FREEJAFREEJA-300) 3. OMICRON (MODEL: CMC 256256-6)

2. MANTA TEST SYSTEMS (MODEL: MTS 4000) 4. DOBLE ( MODEL: F 6150)

RELAY TESTING EQUIPMENTS 1. MEEGER_AVO (MODEL: MPRT 8430) 3. KOCOS (MODEL: ARTES 440 II)

2. RES (MODEL: APTS 3) 4. EURO SMC ( MODEL: TRES)

400KV SUBSTATIONS IN APTRANSCO S.No

400KV SUBSTATION

CAPACITY 1. SRISAILAM 1 2. GHANAPUR (PGCIL)

3. KHAMMAM 1&2(PGCIL) 4. YEDDUMAILARAM**

1. SRISAILAM 2. GHANAPUR (PGCIL)

3. GOOTY (PGCIL) 4. KURNOOL**(PGCIL765)

2 X 315 MVA

1. SIMHADRI 1,2,3&4 (NTPC) 2. GAJUWAKA 1&2 (PGCIL)

3. KHAMMAM 1&2 (PGCIL) 4. VEMAGIRI 1&2

1. KALAPAKA 1&2 2. GAJUWAKA 1&2 (PGCIL) 3. NUNNA 1&2 (PGCIL) 4. NUNNA 3&4 (NRPT** 1&2)

5. GVK EXTN 1&2 (IPP) 6. GOWTHAMI 1&2 (IPP) 7. KONASEEMA 1&2 (IPP) 8. GMR VASAVI 1&2 (IPP)

MAMIDIPALLY (HYDERABAD)

3 X 315 MVA

2.

NURNOOR (KURNOOL)

(2 + 1**) X 315 MVA

3.

KALAPAKA (VISHAKHAPATNAM)

1.

FEEDERS

4.

VEMAGIRI (RAJHAMUNDRY)

2 X 315 MVA

5.

VELTUR (MB NAGAR)

3 X 315 MVA

1. TALLAPALLY

2. RAICHUR

6.

CHITTOR(VEPANJIR)

2 X 315 MVA

1. CHENNAI RED HILLS 3. KRISHNAPATNAM**1&2

2. KADAPA

(2 + 1**) X 315 MVA

1. KRISHNAPATNAM**1&2

7.

NELLORE(MANUBOLU)

8.

DICHPALLY (NIZAMABAD)

2 X 315 MVA

9.

GAJWEL (MEDAK)

2 X 315 MVA

10.

MALKARAM (SECUNDRABAD)

11.

SHANKARPALLY**

3 X 315 MVA

12.

NARASARAOPETA**(GUNTUR)

2 X 315 MVA

13.

SURYAPETA** (NALGONDA)

2 X 315 MVA

(2 + 1**)X 315 MVA

1. RAMAGUNDAM 1. RAMAGUNDAM 3. BTPS 1&2**

2. GHANAPUR 4. YEDDUMAILARAM 1&2**

1. RAMAGUNDAM 3. VTPS**1&2

2. GHANAPUR

1. GAJWEL 1&2*

2. MAMIDIPALLY * 3. SRISAILAM*

1. SRISAILAM 1&2 2. VTPS 1&2

3. VEMAGIRI 1&2

1. VTPS 1&2

2. MALKARAM 1&2

400KV SUBSTATIONS OF PGCIL IN AP S.No

400KV SUBSTATION

1.

RAMAGUNDAM(NTPC)

2.

GHANAPUR (HYDERABAD)

3.

GAJUWAKA (VISHAKHAPATNAM)

CAPACITY

FEEDERS 1. GHANAPUR 1&2 2. GAJWEL 3. MALKARAM

4. TALLAPALLY 1&2 5. DICHPALLY 6. WARANGAL 7. CHANDRAPUR 1&2

3 X 315 MVA

1. RAMAGUNDAM 1&2 2. MAMIDIPALLY 3. GAJWEL

4. NAGARJUNA SAGAR 5. KURNOOL 6. MALKARAM

2 X315 MVA

1. NUNNA(*GMR) 2. KALAPAKA1&2 5. BERAHUMPURBERAHUMPUR-1&2

3. SIMHADRI (VMGR*) 1&2 4. JAIPUR(HVDC)

1. GAJUWAKA(GMR*) 2. VTPS 1&2 3. VEMAGIRI 1&2

4. VEMAGIRI 3&4 (#) 5. KHAMMAM 6. NELLORE 1&2 7. LANCO1&2

2 X 200 MVA 2 X 250 MVA 1 X 315 MVA

4.

NUNNA (VIJAYAWADA)

2 X315 MVA

5.

TALLAPALLY (NAGARJUNA SAGAR)

3 X 315 MVA

1. RAMAGUNDAM 1&2 2. GHANAPUR 3. MAHABOOBNAGAR

4. GOOTY(KNL765*) 5. CHINAKAMPALLY 1&2

6.

BUDIDAMPADU (KHAMMAM)

2 X 315 MVA

1. WARANGAL 2. NUNNA 5. KTPS**1&2

4. MAMIDIPALLY 1&2 5. KALAPAKA 1&2 4. NEELAMANGALA 5. RAICHUR 1&2

7.

GOOTY

2 X 315 MVA

1. TLPLY(KNL765*) 2. SOMANAHALLY 3. KURNOOL

8.

CHINAKAMPALLY

2 X 315 MVA

1. TALLAPALLY 1&2 2. SOMANAHALLY

3. KOLAR 4. CHITTOR

9.

NELLORE(MANUBOLU)

1. NUNNA 1&2 3. MEENAKSHI 1&2

2. ALAMATHI 1&2

10.

MULUGU* (WARANGAL)

1. RAMAGUNDAM 2. KHAMMAM

3. BTPS(KTPS)* 1&2

2 X 315 MVA

1. GAJUWAKA – VEMAGIRI 1&2 IS PROPOSED TO TAKE LILO AT SIMHADRI SS. 2. GAJUWAKA – NUNNA CKT IS PROPOSED TO TAKE LILO AT GMR SS. 3. 765KV KURNOOL IS ABOUT TO START, 765KV DC TO RAICHUR & 400KV KUMPP-DC, KNL 400-DC, LILO TLPLY-GOOTY. 4. 765KV NELLORE, EAST GODAVARI(VEMAGIRI), SRIKAKULAM IS UNDER FORMULATION STAGE. 5. VEMAGIRI TO NUNNA (APTRANSCO) 1&2 LINES WILL BE DISCONNECTED AT NUNNA & EXTENDED UP TO NRPT

400KV NETWORK IN AP DICHPALLY CHANDRAPUR TALLAPALLY (MAHARASTRA)

IPP2

NUNNA VTPS SURYAPETA

NELLORE

KPPTS

MALKARAM NLR**765 ALAMETHI / CHENNAI

KTPS

KHAMMAM GUNTUR(NRPT)

SRISAILAM

YEDDUMAILARAM

LANCO

ASUPAKA

VEMAGIRI

GHANAPUR

KADAPA

GOOTY CHITTOR

RAICHUR MAMIDIPALLY

KPPTS

KOLAR

IPP1

GMR

BANGALORE

IPP4

MBNGR

IPP3

GAJWEL

RELIANCE

BERHUMPUR

BANGALORE

KALAPAKA

BTPS

MALKARAM

WARANGAL

JAIPUR

SIMHADRI

HVDC

RAMAGUNDAM

SIMHADRI

GAJUWAKA

765 KV GRID MAP 765KV SS WARDHA

765KV SS ANGUL

765KV SS TEKKALI 765KV GAJWEL

765KV SS SHOLAPUR

765KV SS HYDERABAD

765KV SS KHAMMAM

765KV SS VEMAGIRI

765KV SS RAICHUR 765KV SS KURNOOL

765KV VODAREVU

POWER GRID APTRANSCO

765KV SS NELLORE

VEMAGIRI SUBSTATION DISPLAY NUNNA – I (PGCIL)

315MVA, 400/220KV AUTO TRANSFORMER-I

NUNNA – II (PGCIL)

315MVA, 400/220KV AUTO TRANSFORMER-II

KALAPAKA – I KALAPAKA – II

GUNTUR – I

GUNTUR – II

GAJUWAKA – I GAJUWAKA – II GOWTHAMI – I GOWTHAMI – II FUTURE – I (PGCIL) (PGCIL) PHES

KOPCL – II VPGCL – I VPGCL – II KOPCL – I GMR VASAVI GMR VASAVI KONASEEMA KONASEEMA

GVK EXT – I

FUTURE – II PHES

GVK EXT – II

VEMAGIRI 765/400 GIS SUBSTATION DISPLAY

A large Pooling station at Vemagiri being planned with 28 nos 400 kV bays, 8 nos 765 kV line bays, 6 nos transformer bays

DISPLAY

400kv Protection presentation

Recommend Documents