Protection System-1

400KV PROTECTION PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION) [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-1

BUS-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-CONFIGUARATION)

BAY16 BAY18

BAY17

BAY14

BAY11

BAY13

DIA6

BAY15

BAY6

FEEDER11

DIA5

BAY12

BAY5

BAY1 BAY2 BAY3

DIA4 BAY10

DIA3

BAY4

DIA2

FEEDER9

FEEDER7

BAY8

BUS-1 DIA1

FEEDER5

BAY7

FEEDER3

BAY9

FEEDER1

BUS-2

FEEDER2

FEEDER4

FEEDER6

FEEDER8

FEEDER10

FEEDER12

SUBSTATION DESIGN/LAYOUT (D-CONFIGUARATION) FEEDER10 BAY14

BAY13

BAY7

DIA1

FEEDER9

BAY8

BAY3

BAY1

BAY2

FEEDER6

DIA3

BAY15

FEEDER5

FEEDER2

BAY9

FEEDER1

DIA5

BUS-1

BAY5

FEEDER3

BAY11

FEEDER4

FEEDER7

FEEDER8

DIA6

BAY18

BAY16

DIA4

BAY12

BAY10

DIA2

BAY6

BAY4

BUS-2

BAY17

FEEDER11

FEEDER12

SUBSTATION DESIGN/LAYOUT (DOUBLE BUS & DOUBLE BREAKER SYSTEM) FEEDER1

FEEDER3

FEEDER1

FEEDER3

BAY6

BAY5

BAY2

BAY1

BAY7

BAY5

BAY3

BAY1

BUS-1

BUS-1

BAY8

BAY7

BAY4

BAY3

BAY8

BAY6

BAY4

BAY2

BUS-2

BUS-2

FEEDER2

FEEDER4

FEEDER2

FEEDER4

FOR ECONOMICAL& RELIABULITY PURPOSE THIS SYSTEM ADOPTED IN 800KV SYSTEM

FEEDER 8

FEEDER 1 1-52 CB

FEEDER 2 2-52 CB

3-52 CB

8-52 CB

FEEDER 7

MESH / RING LAYOUT 4-52 CB

7-52 CB

5-52 CB

6-52 CB FEEDER 6

FEEDER 3

FEEDER 5

FEEDER 4

SUBSTATION DESIGN/LAYOUT (DOUBLE MAIN BUS & TRANSFER BUS SYSTEM) T/F-1

T/F-2

BUS-2

BAY3 BAY1

BAY2

FEEDER1 FEEDER2

BAY4

TRANSFER BUS

BAY5

TRANSFER BUS COUPLER

BUS COUPLER

BUS-1

BAY6

BAY7

BAY8

FEEDER3 FEEDER4

FOR ECONOMICAL& RELIABULITY PURPOSE THIS SYSTEM ADOPTED IN 400 & 220 KV SYSTEM

SUBSTATION DESIGN/LAYOUT (DOUBLE MAIN BUS & CB BYPASS ISO SYSTEM) T/F-1

BAY2

BAY6

BAY4

BAY7

BUS COUPLER

BAY1

T/F-2

BUS-1

BUS-2

BAY3

BAY5

WHEN ANY CB PROBLEM OR FOR PREVENTIVE MAINTANENCE THEN ALL OTHER FEEDERS SHIFTED TO ANOTHER BUS OF FAULTED CB BUS AND CLOSE THE BYPASS ISOLATOR, THEN PROTECTION IS SHIFTED TO BUS COUPLER AND OPEN THE FAULTY CB.

FEEDER1

FEEDER2

FEEDER3

FEEDER4

FOR ECONOMICAL& RELIABULITY PURPOSE THIS SYSTEM ADOPTED IN 220KV SYSTEM

SUBSTATION DESIGN/LAYOUT (SINGLE BUS & TRANSFER BUS SYSTEM) T/F-2

T/F-1

TRANSFER BUS COUPLER

TRANSFER BUS

BUS-1 BAY1

FEEDER1

BAY2

FEEDER2

BAY3

BAY4

BAY5

BAY6

FEEDER3

BAY7

FEEDER4

FOR ECONOMICAL& RELIABULITY PURPOSE THIS SYSTEM ADOPTED IN 220 & 132 KV SYSTEM

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 CB LINE CB LINE

CB

CB 4 CT METHOD

CB

CB

CB

AT/F AT/F

CB

CB

6 CT METHOD CB

LINE

CB

5 CT METHOD

LINE LINE

CB 3 CT METHOD

CB

CB

6 CT METHOD CB

CB 6 CT METHOD

CB

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

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

BUS-2

1-89

3-89

1-52CB 1-CT

3-52CB P2

P2

3 3-CT

3

P1

P1

1-89A

3-89A

3 3

2-CT

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

P1

P2

2-89B 3-89T

LINE 1 T/F-1


BUS-2

1-89

3-89

1-52CB 1-CT

3-52CB P2

P2

3 3-CT

3

P1

P1

1-89A

3-89A

2-89A 1-89L

P1

2-BCT P1

2-52CB

3

P2

3

2-ACT

P2

2-89B 3-89T

LINE 1 T/F-1


BUS-2

1-89

3-89

1-52CB 1-CT

3-52CB P2

P2

3 3-CT

3P1

P1

1-89A

3-89A

P1

2-89A

2-52CB

3

2-CT P2

2-89B

1-89L 1L-CT

3-89T P2

3P1

P2

3T-CT 3 P1

LINE 1 T/F-1


BUS-2

1-89 P2 P1

3-89

3 1A-CT

3A-CT

P2

3

1-52CB

3-52CB

P1

3B-CT

1B-CT 3 P2

1-89A

3

P1 P2

3-89A

2-89A

P1

2B-CT P1

2-52CB

3

P2

3

2A-CT

1-89L

P1

P2

2-89B 3-89T

T/F-1 LINE 1


BUS-2

1-89

3-89

1-52CB

3-52CB

P2

3-CT

1-CT 3 P1

1-89A

2-89A

P1

2B-CT P1

2-52CB

3

3

P2

P2

2-89B

1-89L 1L-CT 3 P1

LINE 1

P1

3-89A 2A-CT

P2

3

P2

3-89T

3T-CT

P2

3 P1

T/F-1


BUS-2

1-89 P2

P2

3 1-CT

1-52CB

3-52CB

1-89A

3-89A

2-89A

P1

2B-CT P1

2-52CB

3

P2

3

2A-CT

P2

2-89B

1-89L 1L-CT 3 P1

LINE 1

3 3-CT

P1

P1

P2

3-89

3-89T

3T-CT

P2

3 P1

T/F-1


BUS-2

1-89 P2 P1

3-89

3 1A-CT

3A-CT

P2

3

1-52CB

3-52CB

P1

3B-CT

1B-CT 3 P2

3

1-89A

P1 P2

3-89A

2-89A

P1

2B-CT P1

2-52CB

3

P2

3

2A-CT

P2

2-89B 3-89T

1-89L P2

P1

3 1L-CT P1

3T-CT

P2

3

P1

T/F-1 LINE 1

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

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

CORE WISE APLICATION OF CTs IN ONE AND HALF CIRCUIT BREAKER SCHEME PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

CURRENT TRANSFORMER CONNECTIONS IN 3CT METHOD 1 – CT 2 – CT 3 – CT BUSBAR-1 2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CORE – 1 ( PS)

CORE – 2 ( PS)

CORE – 3

PROTECTION

CONNECTED TO MAIN PROTECTION FOR TRANSFORMER

BUSBAR-1 CHECKUP PROTECTION (SPARE)

2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO BACKUP PROTECTION AFTER LBB/BFR FOR TRANSFORMER

SPARE

METERING & ENERGY METER FOR AT/F

( 0.5 / 0.2)

CORE – 4

METERING & ENERGY METER FOR FEEDER

SPARE

2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO MAIN-2 PROTECTION AFTER LBB/BFR FOR FEEDER


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

BUSBAR-2 PROTECTION

(0.5 / 0.2)

CORE – 5 ( PS)

CORE – 6 ( PS)

CURRENT TRANSFORMER CONNECTIONS IN 3CT METHOD 1 – CT 2 – CT 3 – CT BUSBAR-1 2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CORE – 1 ( PS)

CORE – 2 ( PS)

CORE – 3

PROTECTION

CONNECTED TO MAIN PROTECTION FOR TRANSFORMER


2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO BACKUP PROTECTION AFTER LBB/BFR FOR TRANSFORMER

METERING & ENERGY METER FOR FEEDER

SPARE

2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO MAIN-2 PROTECTION AFTER LBB/BFR FOR FEEDER


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

BUSBAR-2 PROTECTION

(0.5 / 0.2)

CORE – 4 ( PS)

CORE – 5 ( PS)

BUSHING CT METERING CORE (0.5 / 0.2)

NORMALLY THIS SYTEM ADOPTS, WHEN ONE SIDE LINE, OTHER SIDE AUTO TRANSFORMER / 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 METERING & ENERGY METER FOR AT/F OR BUS REACTOR.

CURRENT TRANSFORMER CONNECTIONS IN 4CT METHOD CORE-1 (PS)

CORE-2 (PS)

CORE-3 (0.5/0.2)

CORE-4 (PS)

CORE-5 (PS)

1- CT

2-BCT

2-ACT

3-CT

CT SECONDARY CORE IS CONNECTED TO BUSBAR-1 PROTECTION

SPARE

SPARE

CT SECONDARY CORE IS CONNECTED TO BUSBAR-2 PROTECTION


SPARE

SPARE


2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO PANEL METERS & ENERGY METER


2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO MAIN-2 PROTECTION AFTER LBB/BFR

2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO BACKUP PROTECTION AFTER LBB/BFR

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

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

CURRENT TRANSFORMER CONNECTIONS IN 5CT METHOD 1-CT

1-LCT

2-CT

3-TCT

3-CT

BUSBAR-1 PROTECTION

TEED PROT-1 (BAY 1&2)



BUSBAR-2 PROTECTION






CORE-3 (0.5/0.2)

SPARE

METERING & ENERGY METER

SPARE


SPARE

CORE-4 (PS)

TEED PROT-2 (BAY 1&2) AFTER LBB/BFR (1-52)

MAIN-2 PROTECTION


BACKUP PROTECTION


CORE-5 (PS)


MAIN-1 PROTECTION


MAIN PROTECTION


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

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).

CURRENT TRANSFORMER CONNECTIONS IN 6CT METHOD (GIS or AIS with DEAD TANK CBs) 1B-CT CORE-1 (PS) CORE-2 (PS)

BUSBAR-1 PROTECTION

BUSBAR-1 CHECKUP PROTECTION

(SPARE)

CORE-3 (0.5/0.2)

SPARE

1A-CT

2B-CT

2A-CT

3A-CT



2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO MAIN-2 PROTECTION AFTER LBB/BFR

2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND CONNECTED TO BACKUP PROTECTION AFTER LBB/BFR



3B-CT BUSBAR-2 PROTECTION

BUSBAR-2 CHECKUP PROTECTION

(SPARE)

SPARE

CURRENT TRANSFORMER CONNECTIONS IN 6CT METHOD 1-CT

1L-CT

2A-CT

2B-CT

3T-CT

3-CT

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

BUSBAR-1 PROTECTION


SPARE

SPARE


BUSBAR-2 PROTECTION

BUSBAR-1 CHECKUP


SPARE

SPARE


BUSBAR-2 CHECKUP

CORE-3 (0.5/0.2)

SPARE


SPARE

SPARE


SPARE

CORE-4 (PS)


MAIN-2 PROTECTION



BACKUP PROTECTION


CORE-5 (PS)


PROTECTION (SPARE)

PROTECTION (SPARE)

AFTER LBB/BFR (1-52)


MAIN-1 PROTECTION




MAIN PROTECTION


CURRENT TRANSFORMER CONNECTIONS IN 8CT METHOD 1B-CT

1A-CT

1L-CT

2B-CT

2A-CT

3T-CT

3A-CT

3B-CT

BUSBAR-1 MAIN-1 PROTECTION

LBB PROT (BAY-1)


LBB PROT (BAY-2)

LBB PROT (BAY-2)


LBB PROT (BAY-3)



LBB PROT (BAY-1)



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

LBB PROT (BAY-3)


MAIN-2





CORE-1 (PS) CORE-2 (PS) CORE-3 (PS)

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

CORE-4 (PS)

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

CORE-5 (0.5/0.2)

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

PROTECTION

MAIN-1 PROTECTION METERING & ENERGY METER

SOME TIMES DUPLICATED BUSBAR PROTECTION WITH DUPLICATE LBB IS REQUIRED

BACKUP PROTECTION

MAIN PROTECTION METERING & ENERGY METER

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

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

1

3 3 3

3 2

BB-EVT / CVT 1-52CB

3

1

3 3 3

3

3

CORES 3 4

MAIN-1 PROTECTION

MAIN-2/BACKUP PROTECTION

3

2

3

BUS

METERING

BUS BAR CHECKUP PROT

1-89 1

3

P2

BUS BAR PROTECTION

3

SINGLE BUS SYSTEM 1-CT 5 P1

1-89L 1-CVT

2

3

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

21M1 VBB1

VL1

25

VL1 / VL2 OR VBB2

BF 87L

21M2

VL1

CVT

VL1 FEEDER1 / LINE1

79 VL1 / VBB1 VL2 / VBB2

25

BF

FEEDER2 / LINE2 CVT VL2

MAIN-1 BF VL2 / VL1 OR VBB1 CVT VBB2

VBB2

MAIN-2

PROTECTION OF LINE2 (OR TRANSFORMER, IF APPLICABLE)

79 25 BUSBAR-2 87BB2

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

ONE & HALF BREAKER ( 4 CT METHOD) WITH PROTECTION SCHEME 87BB1 BUSBAR-1 79 CVT VBB1

21M1 VBB1

VL1

25

VL1 / VL2 OR VBB2

BF 87L

21M2

VL1

CVT

VL1 FEEDER1 / LINE1


25

BF


MAIN-1 BF VL2 / VL1 OR VBB1 CVT VBB2

VBB2

MAIN-2


79 25 BUSBAR-2 87BB2


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

21M1

VBB1

BF

79 VBB1

VL1

25

87L

VL1 / VL2 OR VBB2

21M2

VL1

CVT

VL1 FEEDER1 / LINE1


25

BF


MAIN-1 VL2 / VL1 OR VBB1 CVT VBB2

VBB2

BF

79

MAIN-2


25 BUSBAR-2 87BB2


ONE & HALF BREAKER ( 5 CT METHOD) WITH PROTECTION SCHEME 87BB1 BUSBAR-1 21M1

79

87 TD1 HZ

CVT VBB1

VBB1

VL1

25

VL1 / VL2 OR VBB2

BF

.

87L

87 TD2 LZ

21M2

VL1

CVT

VL1 FEEDER1 / LINE1


25

BF

FEEDER2 / LINE2

. BF VL2 / VL1 OR VBB1 CVT VBB2

VBB2

CVT VL2 MAIN-1 87 TD2 LZ

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

79 87 TD1 HZ

25

BUSBAR-2 87BB2



79

87 TD1 HZ

CVT VBB1

VBB1

VL1

25

VL1 / VL2 OR VBB2

BF

.

87L

87 TD2 LZ

21M2

VL1

CVT

VL1 FEEDER1 / LINE1


25

BF

FEEDER2 / LINE2

. BF VL2 / VL1 OR VBB1 CVT VBB2

VBB2

CVT VL2 MAIN-1 87 TD2 LZ


79 87 TD1 HZ

25

BUSBAR-2 87BB2



VL1

87 TD1 HZ

CVT VBB1

BF 87 TD2 LZ

79 VBB1

87L

21M2

VL1

CVT

VL1

25

VL1 / VL2 OR VBB2

FEEDER1 / LINE1


VL2 / VL1 OR VBB1 VBB2

25

BF

FEEDER2 / LINE2 79 CVT VL2 25

MAIN-1 87 TD2 LZ


BF

VBB2 CVT

87 TD1 HZ BUSBAR-2 87BB2


ONE & HALF BREAKER ( 6 CT METHOD) WITH PROTECTION SCHEME CVT VBB1 (WITH LATEST CONCEPT) BUSBAR-1 VL1 / VL2 OR VBB2

21M1

25

VL1

VBB1 79

87BB

BF

87L

21M2

VL1

CVT

VL1 FEEDER1 / LINE1

VL1 / VBB1 VL2 / VBB2 25 79

87BB

BF

IN THIS CONCEPT FOR ONE & HALF BREAKER SYSTEM A NEW RELAY DEVELOPED WHICH INCLUDES AUTO RECLOSURE + CHECK SYN + LBB RELAY(79+25+50). FROM THIS RELAY TO BUSBAR RELAY ONLY FIBRE OPTIC CONNECTION(NO PHYSICAL). THE DATA WILL BE COMMUNICATED BETWEEN 87BB & LBB. IN THIS 1+1 DUPLICATED BUSBAR PROTECTION IS ADOPTED. FEEDER2 / LINE2

BF 79

CVT VL2

MAIN-1 MAIN-2


VBB2 VL2 / VL1 OR VBB1

25 BUSBAR-2 CVT VBB2


MET+SYN

MAIN-1 MAIN-2

3-52CB

2-52CB

BUS-II

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

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 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. ICT HV METERING IS BUSHING CT

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 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

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

MAIN-1 MAIN-2 MET+SYN

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

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

COMPARISION BETWEEN DIFFERENT CT METHODS CT PURPOSE

3 CT METHOD

4 CT METHOD

6 CT (S) METHOD

5 CT METHOD

6 CT (T1) METHOD

6 CT (T2) METHOD

BUSBAR & BUSBAR CHECKUP PROTECTION

1 CT

1 CT

1B CT

1 CT

1 CT

1 CT

MAIN-1 MAIN-2 PROTECTION & METERING

ADDITIONAL PROTECTION AVAILABLE

BLIND ZONE

ADVANTAGES

ABOVE FOR BUS-1

&

BELOW FOR BUS-2

3 CT

3 CT

3B CT

3 CT

3 CT

3 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 CT SECONDARIES ARE CONNECTED PARALLEL FOR FEEDER-1 BELOW CT SECONDARIES ARE CONNECTED PARALLEL FOR FEEDER-2 3 - CT & 2 – CT

3 - CT & 2 A - CT

3 A - CT & 2 A - CT

ABOVE FOR FEEDER-1 BELOW FOR FEEDER-2 3 L - CT

3 L - CT

3 L – CT

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

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

STUB-1 & STUB-2 PROTECTION IS A NORMALLY INBUILT PROTECTION FOR MAIN-1 & MAIN-2 RELAYS, IN CASE OF LATEST NUMERICAL RELAYS. STUB PROTECTION WORKS WHEN LINE ISOLATOR OPEN CONDITION ONLY.

TEED–1 IS NORMALLY HIGH IMPEDENCE DIFFERENTIAL RELAY & TEED-2 IS NORMALLY LOW IMPEDENCE DIFFERENTIAL RELAY. THESE ARE NOT INBUILT FUNCTIONS OF MAIN-1 & MAIN-2 RELAYS.

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. THIS IS BLIND ZONE AREA. MINIMUM CT METHOD. REDUCING THE COST OF CTs

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.

BLIND ZONE FOR MAIN CB & TIE CB

TIE CB BLIND ZONE AREA IS TAKEN CARE

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, TEED PROTECTION IN ADDITION TO DISTANCE SCHEME SHOULD TAKE CARE.

400KV C.T. INFORMATION P1

PRIMARY CONNECTIONS : P1 – P2 CURRENT RATING : 2000 AMPS

500/ 1A

1S1 – 1S3

1S1 – 1S2 1S2 – 1S3

__

PS

BUSBAR CHECKUP 2S1 – 2S3 PROTECTION

2S1 – 2S2 2S2 – 2S3

CORE-3 0.5 / 0.2

METERING

3S1 – 3S3 3S4 – 3S2

CORE-4

MAIN-2 4S1 – 4S3 4S1 – 4S2 4S1 – 4S4 PROTECTION 4S4 – 4S2 4S4 – 4S3 5S1 – 5S2 5S4 – 5S3

3

U

5S1 – 5S3 5S4 – 5S2

3

2S12 2S 3 2S

1 5S S2 5 S3 5 S4 5

U

MAIN-1 5S1 – 5S4 PROTECTION

3

U

PS

1 1S S1 1S 2 3

4S1 4S2 4S3 4S4

3S1 3S2 3S3 3S4

CORE-5

PS

3S1 – 3S4

__ 3S1 – 3S2 3S4 – 3S3

3 3

2S1 2S2 2S3

3

CORE-2

1S1 1S2 1S3

U

BUSBAR PROTECTION

5S1 5S2 5S3 5S4 4S1 4S2 4S3 4S4

3S1 3S2 3S3 3S4

PS

CORE-1

3

1000/ 1A

U

2000/ 1A

3

PURPOSE

U

CLASS

P1 P2

3 3

CORES

SECONDARY CONNECTIONS CURRENT RATING : 1A

P2

HAIR PIN / U SHAPE DESIGN

EYE BOLT DESIGN

DEAD TANK DESIGN

MAIN-1, MAIN-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- 1 PROTECTION

MAIN-2 PROTECTION/ BACKUP PROTECTION

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 67N

7.

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

IF MAIN-1 & 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% REDENDENCY IN ALL ASPECTS ( COMPLEMENTARY TO EACH OTHER ) . DISSIMILAR CARRIER SCHEMES ARE TO BE SELECTED ( POTT & PUTT or BLOCK & UNBLOCK). OTHER WISE MAIN-2 MAY BE DIFFERENT MAKE OR PHASE COMPARISION PROTECTION/LINE DIFFERENTIAL PROTECTION WITH BACKUP DISTANCE PROTECTION IS TO BE ADOPTED. BOTH M1 & M2 SHOULD CONTAIN DIRECTIONAL EARTH FAULT PROTECTION (67N) WITH DIRECTIONAL COMPARISION PICKUP SCHEME AS INBUILT FUNCTION. ZONE-1: 80% OF MAIN LINE ZONE-2: 100% OF MAIN LINE + 50% OF SHORTEST LINE AT OTHER END ZONE-3: 100% OF MAIN LINE + 100% OF SHORTEST LINE AT OTHER END ZONE-4: 100% OF MAIN LINE + (100% OF SHORTEST LINE + 20% OF LONGEST LINE) AT

OTHER END.

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

CT MB

IR5 / A511 IY5 / A531 IB5 / A551

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

3 3 3

CORE-5

(4CT METHOD)

5S4

5S4

5S4

5S2

5S2

5S2

IN5 / A571

CLASS: PS

VR11 / E111 VY11 / E131 VB11 / E151 VN11 / E171 1-CVT

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

CORE – 1 200VA 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) (4CT 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


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 VY11 / E131 VB11 / E151 VN11 / E171

1-CVT CORE – 1 200VA CLASS: 3P

MAIN-1 PROTECTION FOR LINE (21L1) (5CT 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

IN5 / A571

VR11 / E111 VY11 / E131 VB11 / E151 VN11 / E171 1-CVT CORE – 1 200VA CLASS: 3P

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

50Z LBB/BFR

CT MB

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

3 3 3

CORE-4

4S4

4S4

4S4

4S2

4S2

4S2

IN4 / C471

CLASS: PS



200VA CLASS: 3P

CT MB

3 3 3

CTR: 2000-1000-500/1A

21 L2

CORE – 2

2-BCT CORE-4

IR4 / C411 IY4 / C431 IB4 / C451

4S2

4S2

4S2

4S4

4S4

4S4

CLASS: PS

P2 P2 P2

50ZT LBB/BFR

MAIN-2 PROTECTION FOR LINE (21L2) (4CT METHOD) ( NEW DEVELOPMENT) 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

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

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

1-CVT CORE – 2 200VA 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) (5CT 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

IN4 / C471

VR21 / E211 VY21 / E231 VB21 / E251 VN21 / E271 1-CVT CORE – 2 200VA CLASS: 3P

MULTI FUNCTION PANEL METERING & ENERGY METER (4CT 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


CLASS: 0.5

CT MB

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

3 3 3

CORE-3

3S2

3S2

3S2

3S4

3S4

3S4

CLASS: 0.5

VR31 / E311 VY31 / E331 VB31 / E351 VN31 / E371 1-CVT CORE – 3 100VA

P2 P2 P2

CLASS: 0.5/0.2

MULTI FUNCTION PANEL METERING & ENERGY METER (5CT 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: 0.5/0.2 IN3 / D371

VR31 / E311 VY31 / E331 VB31 / E351 VN31 / E371 1-CVT CORE – 3 100VA CLASS: 0.5/0.2

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

BASICS OF LBB/BFR PROTECTION LOCAL BREAKER BACKUP PROTECTION A PROTECTION WHICH IS DESIGNED TO CLEAR A SYSTEM FAULTY BY INITIATING TRIPPING OTHER CIRCUIT BREAKER(S) IN THE CASE OF FAILURE TO TRIP OF THE APPROPRIATE CIRCUIT BREAKER. IN MODERN NETWORKS THE CRITICAL FAULT CLEARING TIME MAY BE LESS THAN 200ms. HENCE, IF THE FAULT IS NOT CLEARED DUE TO FAILURE OF THE PRIMARY PROTECTIVE RELAYS OR THEIR ASSOCIATED CIRCUIT BREAKER, A FAST ACTING BACKUP PROTECTIVE RELAY MUST CLEAR THE FAULT. THERE ARE TWO BASIC FORMS. REMOTE BACK-UP. LOCAL BACK-UP.

REMOTE BACK-UP PROVIDES BACK-UP PROTECTION FOR THE BOTH THE RELAYS (MAIN-1 & MAIN-2) AND BREAKERS AT REMOTE SUBSTATION.

LOCAL BACK-UP LOCAL BACK-UP PROTECTION CAN BE DEVIDED INTO TWO CATAGORIES. RELAY BACK-UP BREAKER BACK-UP

RELAY BACK-UP z

DUPLICATE PRIMARY PROTECTION. i.e ONE IS NON SWITCHED DISTANCE PROTECTION AND ANOTHER IS SWITCHED DISTANCE SCHEME OR OTHER WISE BOTH SCHEMES CHARECTERSTICS ARE DIFFERENT (QUADRALATERAL, MHO CIRCULAR, TAMOTO & OPTICAL ) OR DIFFERENT MANUFACTURERS(ABB, ALSTOM, SIEMENS, EASUN REYROLL, SEL, GE, NXT PHASE OR BASLER) OR DIFFERENT METHODS (i.e ELECTROMECHANICAL, STATIC, NUMERICAL{MICROPROCESSOR &DSP}). IF MAIN-1 & MAIN-2 ARE NUMERICAL RELAYS BOTH SHOULD BE SEPARATE CHARECTERESTICS AND SEPARATE MODELS AND ALL FEATURES SHOULD BE AVAILABLE IN BOTH SCHEMES AND BOTH RELAYS SHOULD BE 100% REDENDENCY IN ALL ASPECTS. TO INCREASE THE SECURITY, THE CIRCUIT BREAKER HAS TWO TRIP COILS, ONE IS CONNECTED TO MAIN-1 PROTECTION AND ANOTHER IS CONNECTED TO MAIN-2 PROTECTION.

BREAKER BACK-UP BECAUSE OF THE HIGH COST OF HIGH VOLTAGE CIRCUIT BREAKERS, IT IS NOT FEASIBLE TO DUPLICATE THEM. IN CASE OF A BREAKER FAILURE THE OTHER CIRCUIT BREAKERS CONNECTED TO THE SAME BUS AS THE FAULTED BREAKER MUST THERE FORE BE TRIPPED.

LBB/BFR FLOW CHART MAIN PROTECTION OPERATED

YES

TRIP MAIN BREAKER

FAULT CLEARED

NO

RETRIP

YES

INITIATE BFR

YES

RESET BREAKER FAILURE SCHEME

WAIT FOR FAULT CLEARENCE

AND

TRIP BACK-UP/ Adjacent BREAKERS

The Breaker Failure Protection (LBB/BFR) can operate single-stage/two-stage. When used as single-stage protection, the Bus trip command is given to the adjacent Circuit Breakers if the protected feeder Breaker fails. When used as two-stage protection, the first stage can be used to repeat the trip command to the relevant feeder Breaker, normally on a different trip coil, if the initial trip command from the feeder protection is not successful. The second stage will result in a Bus trip to the adjacent Breakers, if the command of the first stage is not successful.

LBB/BFR TIME CO-ORDINATION CHART FAULT OCCURS

NORMAL CLEARING TIME

NORMAL CLEARING PROTECTIVE RELAY FOR EX: DISTANCE RELAY

RESETTING TIME OF THE CURRENT MEASURING UNITS

BREAKER INTURUPTING TIME

~30ms

~60ms

MARGIN

<12ms

SET TIME OF THE TIME MEASURING UNIT

INOPERATIVE BREAKER

TRIPPING RELAY TIME

BACK-UP BREAKER INTERUPTING TIME

BREAKER FAILURE RELAY START TOTAL CLEARING TIME OF THE BREAKER FAILURE RELAY MAXIMUM FAULT CLEARING TIME BEFORE SYSTEM INSTABILITY

MARGIN

LBB/BFR LOGIC CURRENT INPUTS PHASE L1

LED (PHASE START) ALARM RELAY (PHASE START)

A/D CONVERTER PHASE CURRENT SET POINT

~

I > ISET

&

PHASE L2/E PHASE L3

>1 I > ISET |||

& ALARM RELAY (EARTH START)

EARTH CURRENT SET POINT

OUT PUT OF DISTANCE RELAY OR SHORT CIRCUIT CURRENT RELAY

LED (EARTH START)

BINARY INPUT CIRCUIT BREAKER FAILURE INITIATE

TIMING/OUTPUT STAGE

TRIP T1 RELAY

TIME STAGE T1

LED

& 0

1

TIME STAGE T2 SWITCHED OFF

>1

TIME STAGE T2

O& 0

ALARM T1 RELAY

&

1

TRIP T2 RELAY

LED LED CB FAILURE INITIATE

LBB/BFR PROTECTION LINE1 BUS-1

¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾

AT/F-1 1-52CB

50Z

2-52CB

50ZT

3-52CB

50Z

BUS-2

LBB/BFR IS LOCAL BREAKER BACKUP PROTECTION/ BREAKER FAILURE RELAY. 1No RELAY IS PROVIDED FOR EACH BREAKER. THIS IS CURRENT OPERATED RELAY. THIS RELAY IS ENERGISED WHEN MASTER TRIP RELAY(86-A OR/AND 86-B) OPERATES OR SINGLE PHASE TRIP RELAYS OPERATES AND GIVEN SIGNAL TO BREAKER FOR TRIP. IN THIS RELAY TIME DELAY IS PROVIDED. THIS RELAY OPERATES WHEN THE BREAKER IS UNDER TROUBLE/ FAILS TO OPERATE. AFTER ENERGISED THE 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 86-A

50Z

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

TO 86-B TRIP RELAY OF TIE CB(2-52CB)

1-52CB TC-1 BUS-1

ABB REL316 MAIN-2

86-B

86-B

86-A

ABB REL521 MAIN-1

TC-2

2-52CB TC-2 TC-1

3-52CB BUS-2

Breaker Failure Relay of the Main Circuit Breaker Trips the Connected Bus, Tie Circuit Breaker, and Remote End Circuit Breaker

2-52 CB LBB/BFR OPERATION ABB RET521 MAIN-1

86-A

ABB REL521 MAIN-1

86-B

ABB REL316 MAIN-2

ABB RET316 MAIN-2

50ZT DIRECT TRIP 1&2 VIA CARRIER TO OTHER END

INTER TRIP TO LVCB & TBCCB

TO 86-B TRIP RELAY OF AT/F(ICT) CB (3-52CB)

TO 86-B TRIP RELAY OF LINE CB(1-52CB)

2-52CB

1-52CB TC-1 BUS-1

3-52CB TC-2 BUS-2

Breaker Failure Relay of the Tie Circuit Breaker Trips the Both Main Circuit Breakers and Remote End Circuit Breakers ( In case of Transformer LV Circuit Breaker)

3-52 CB LBB/BFR OPERATION

ABB RET316 MAIN-2

86-A 86-B

86-B

86-A

ABB RET521 MAIN-1

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

TO 86-B TRIP RELAY OF TIE CB(2-52CB)

2-52CB

1-52CB TC-1 BUS-1

3-52CB TC-2

TC-2

TC-1 BUS-2

Breaker Failure Relay of the Main Circuit Breaker Trips the Connected Bus, Tie Circuit Breaker, and Remote End Circuit Breaker ( In case of Transformer LV Circuit Breaker)

BASICS OF BUSBAR PROTECTION NEED FOR BUSBAR PROTECTION ¾ IN ITS ABSENCE FAULT CLEARING TAKES PLACE IN ZONE-2 OF DISTANCE RELAY BY REMOTE END TRIPPING. ¾ THIS MEANS SLOW AND UNSELECTIVE TRIPPING AND WIDE SPREAD BLACKOUT.

EFFECT OF DELAYED CLEARENCE ¾ GREATER DAMAGE AT FAULT POINT. ¾ INDIRECT SHOCK TO CONNECTED EQUIPMENT LIKE SHAFTS OF GENERATOR AND WINDINGS OF TRANSFORMER.

BASIC THEORY ¾ 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 ¾ ¾ ¾ ¾

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.

BASICS OF BUS BAR PROTECTION BASIC THEORY KIRCHOFF’s CURENT LAW STATES THAT THE SUM OF THE CURRENTS ENTERING A GIVEN NODE MUST BE EQUAL TO THE CURRENTS LEAVING THAT NODE

EXTERNAL FAULT

INTERNAL FAULT IF

I1

I1 I2

I3

I2 I3

I4 I5

I4 I5

I6

I6

IF

IF= I6= I1+I2+I3+I4+I5

IF= I1+I2+I3+I4+I5+I6

HIGH IMPEDENCE BUSBAR PROTECTION 87BBC

UU

UU

UU

UU

UU

UU

UU

UU

UU

UU

UU

UU

87BBM

96 BBC : BUSBAR CHECK TRIPPING RELAY

52 CIRCUIT BREAKER TRIP COIL

- VE A varistor is normally applied across the relay input terminals to limit the voltage to a value safely below the insulation voltage of the secondary circuits

+ VE

96 BBM : BUSBAR MAIN TRIPPING RELAY

UU

UU OVER CURRENT COIL

UU

Is

Id

OVER CURRENT STARTER RELAYS

.

UU

UU 52 CIRCUIT BREAKER TRIP COIL

UU

OPERATING COIL

LOW IMPEDENCE BUSBAR PROTECTION RESTRAINT COIL

+VE

96 BUS BAR TRIPPING RELAY

-VE

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 STABLISE THE RELAY FOR HEAVY EXTERNAL FAULTS. THIS IS CIRCULATING CURRENT PRINCIPLE.

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

CTs

IT REQUIRES ALL IDENTICAL CT RATIO’s & TURNS RATIO. LOW IT CAN WORK WITH CTs OF UNEQUAL RATIOS ALSO. FREE OF RESISTANCE OF SECONDARY WINDING. Class X for all CT Cores. ANY NEED OF MATCHED CT CHARACTERESTIC OR RATIOs LOW MINIMUM KNEE POINT VOLTAGE OF 300-500V. LEAKAGE REACTANCE OR RESISTANCE. OTHER PROTECTIVE LOW MAGNETISING CURRENT(FEW MILLIAMPS). RELAYS CAN BE INCLUDED IN THE SAME CIRCUIT.

BURDEN

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

CT SATURATION

OPERATION OF SCHEME EVEN WHEN CTs GET SATURATED DURING OPERATION OF SCHEME EVEN WHEN CTs GET SATURATED INTERNAL FAULTS. DURING INTERNAL FAULTS. INSENSITIVE TO CT 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. ( WITH OR WITHOUT TRANSFER BUS).

OPERATING TIME

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

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

STABILITY

INABILITY TO COPE WITH INCREASING FAULT CURRENT.

STABLE FOR INFINITE FAULT LEVEL.

PERFORMANCE

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

ADDITIONAL PROTECTION

THIS RELAY REQUIRES CHECK ZONE 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. PROVIDED.

DETAILS

BUS BAR MAIN & CHECHUP 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

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


DUPLICATE BUS BAR PROTECTION (NEW DEVELOPMENT) P2 P2 P2

CT MB


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

3 3 3

CORE-1

IN1 / B171 1S3

1S3

1S3

1S1

1S1

1S1

IB1 / B151

CLASS: PS

IY1 / B131 IR1 / B111

50Z

MAINCB LBB IS PART OF BUSBAR PROTECTION

LBB 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

50Z P2 P2 P2


BUS-2

87 – BB2 BUS BAR-2 PROTECTION

UU

10-CT

UU

13-CT

UU

16-CT

UU

UU

12-CT

UU

15-CT

UU

18-CT

UU

12-52

15-52

18-52

21-52

20-52

17-52

14-52

11-52

19-CT

7-CT

9-CT

19-52

16-52

13-52

10-52

7-52

4-52

1-52

87 – BB1

21-CT

UU

UU

9-52 8-52

4-CT

UU

1-CT

UU

6-CT

5-52

2-52

UU

3-CT

UU

6-52

3-52

BUS BAR PROTECTION BUS BAR-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 CONCEPT- DUPLICATE ) DECENTRALISED CONCEPT

(REB 500) ABB

DECENTRALISED CONCEPT FO FO

(REB 500) ABB

MAIN CB LBB MAIN CB LBB

OR

FO

(7 SS 52) SIEMENS

(7 SS 52) SIEMENS

TIE CB LBB

FO

OR

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

CENTRALISED CONCEPT

(REB 670) ABB

(REB 670) ABB

OR

OR (487B) SEL

(487B) SEL

OR OR (MICOM P746) AREVA

(MICOM P746) AREVA

LBB INBUILT FEATURE

LBB INBUILT FEATURE

BUSBAR-1 PROTECTION TRIPPING SCHEME 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



10-52 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



10-52CB 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



16-52 CB PANEL



+VE

BUSBAR PANEL



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


6-52 CB PANEL



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



12-52 CB PANEL TRIP FROM 50 LBB




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



18-52 CB PANEL



+VE

BUSBAR PANEL



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

11-52

10-52

BUS-2

12-52

7-52 8-52 9-52

5-52 6-52

4-52

2-52 3-52

1-52

BUS-1

LATEST DEVELOPMENT IN NUMERICAL CENTRALISED BUS BAR PROTECTION

ABB

SIEMENS

AREVA

BUSBAR PROTECTION CENTRAL UNIT BAY UNIT ABB Network Partner AG

REL531

ABB Network Partner AG

1 2 3 4 5 6 7 8

LINE PROTECTION

REC 316*4

9 10 11 12 13 14 15 16

C

C

E E

21 L2

21 L1 ABB Network Partner AG

REL531


1 2 3 4 5 6 7 8

TRANSFORMER PROTECTION 87 T1 1. 2. 3.

DESCRIPTION 4.

21 L1

21 L2

21 L1

21 L2

87 T1

87 T2

87 T1

87 T2

REC 316*4

9 10 11 12 13 14 15 16

C

C

E

E

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)

LINE-1

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

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

3

2-52CB

3

1-52CB

3

BUS-1

3

STUB-1/ STUB-2 PROTECTION 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 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) OPERATES

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

IT OPERATES THE 3-PH TRIP GR-A MAIN CB (1-52CB OR 3-52CB) AND 3-PH TRIP GR-A TIE CB (2-52CB) IT OPERATES THE 3-PH TRIP GR-B MAIN CB (1-52CB OR 3-52CB) AND 3-PH TRIP GR-B TIE CB (2-52CB)

2-52CB

TEED-1&2 (BAY 1&2)

3

3

1-52CB

3

BUS-1

3

TEED-1/ TEED-2 PROTECTION 3

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 1-52CB & 2-52CB. SIMILARLY IF TEED PROTECTION BAY 2&3 OPERATED THEN IT TRIPS 2-52CB & 3-52CB.

TEED-1 PROTECTION

SUMMATION OF INDIVIDUAL PHASES OF T-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 TEED-1 PROTECTION.

TEED-2 PROTECTION

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 TEED-2 PROTECTION.

TEED-1 PROTECTION {BAY1&2}(5CT METHOD)

P2 P2 P2

IR5 IY5 IB5

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

3 3 3

CORE-5

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

1-LCT CTR: 2000-1000/1A

CLASS: PS

IN1 1S3

1S3

1S3

1S2

1S2

1S2

3 3 3

CORE-1

IB1 IY1 IR1 P1 P1 P1

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

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

3 3 3

CORE-4

4S4

4S4

4S4

4S2

4S2

4S2

CLASS: PS

CT MB

87 TEED-2

RAICA LBB/BFR

CT MB

RAICA LBB/BFR

{BAY1&2}(5CT METHOD) P2 P2 P2

P2 P2 P2

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 CTR: 2000-1000/1A

CLASS: PS

3 3 3

CORE-2

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

STUB OR TEED-1

86-A MTR/ HSTR

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

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

86-A MTR/ HSTR

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

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

TEED-2 OR STUB

86-B MTR/ HSTR

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

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

86-A MTR/ HSTR

STUB OR TEED-1

TEED-2 OR STUB

86-B MTR/ HSTR

86-A : GROUP-A MASTER TRIP RELAY / HIGH SPEED TRIP RELAY 86-B : GROUP-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-1 & 2 PROTECTION

AUTO RECLOSURE BASICS ¾ 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. ¾ 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. ¾ ADVANTAGES: A. Decreasing outage time. B. Improving Reliability. C. Improving system stability. D. Reduce fault damage and Maintenance Time. ¾ DEAD TIME: The time between the Auto-reclosing Scheme being energized and the operation of the contacts which energize the Circuit Breaker closing circuit. ¾ 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.

¾ 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.

¾ 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. ¾ 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 ONE & 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

DEAD TIME

RESETS

RECLOSE ON TO FAULT

OPERATING TIME

TRIP COIL CONTACTS ARC CONTACTS ENERGISED SEPARATE EXTINGUISHED FULLY OPEN

CIRCUIT BREAKER

OPERATES

RESETS

PROTECTION

PERMANENT FAULT

CLOSING COIL CONTACTS CONTACTS MAKE FULLY CLOSED ENERGISED

OPENING TIME

CLOSING COIL CONTACTS CONTACTS ENERGISED MAKE FULLY CLOSED

CLOSING TIME

ARCING TIME

OPERATING TIME

DEAD TIME

ARC CONTACTS 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 (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

ACCELERA TED 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

DRAWBACKS

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.

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 Infeed Amplitude Modulated Power Line Carrier Frequency or Phase Modulated Power Line Carrier Communication

independent of Power Line

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

POTT

BLOCKING

UNBLOCKING Suitable Same as POTT.

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 at Both Ends for 100% Coverage.

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 250V 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 250V DC

DISPLAY

E

C S

910+

C R

1314+

G4AA TB: V9LB

9-

TX TRIP B(D)

RX TRIP B(D)

G4AC TB: V9LC

C S

10+ 13C R

14+

TX TRIP D(B)

RX TRIP D(B)

GA4D TB:V9LC

PROTECTION COUPLERS FOR 400KV LINE ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾

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 PANEL-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 COUPLER-2 PANEL ALSO 3 CARDS ARE PROVIDED SIMILAR TO PROTECTION COUPLER-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 CHANNEL-1( G4AD). 1SET TX & RX FOR SPARE UNDER EMERGENCY(G4AD). THE ABOVE ARRANGEMENT SIMILAR FOR PROTECTION COUPLER PANEL-2. G4AA CARD FOR ALARM.

NSD 50

MAIN-1 PROTECTION CARRIER INTER TRIPPING G4AC V9LC 1 LINE

G4AC V9LC 6

IN OUT CARRIER RECEIVE

G4AC V9LC 5

ABB

CR -VE

CS

G4AC V9LC 2

CARRIER SEND

G4AA V9LB 5 G4AA V9LB 6 PANEL-1

NSD 50

21L1

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 G4AC V9LC 1 LINE

G4AC V9LC 6

IN OUT CARRIER RECEIVE

G4AC V9LC 5

ABB

CR -VE

CS

G4AC V9LC 2

CARRIER SEND

G4AA V9LB 5 G4AA V9LB 6 PANEL-2

NSD 50

21L2

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 CHANNEL-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 CHANNEL- 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 CHANNEL-1&2 PANEL-1

ABB NSD 50

TO 86-A MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR MAIN CB(152CB)

DC +VE

TO 86-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 86-B MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR MAIN CB(152CB)

DC +VE

TO 86-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

REC 316*4


1

9

1

9

2 3 4 5 6

10 11 12 13 14

2 3 4 5 6

10 11 12 13 14

7 8

15 16

7 8

15 16

C

E

REL 316 MAIN-2 PROTECTION

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

REC 316*4


1

9

1

9

2 3 4 5 6

10 11 12 13 14

2 3 4 5 6

10 11 12 13 14

7 8

15 16

7 8

15 16

C

E


REC 316*4

C

E

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

REL531


REL531



FOX-U FOX-515

REC 316*4


1

9

1

9

2 3 4 5 6

10 11 12 13 14

2 3 4 5 6

10 11 12 13 14

7 8

15 16

7 8

15 16

C

E


OTERM

E

TUNOS

C

E

TUNOS

OTERM

FOX-U FOX-515

C

REC 316*4

C

E

MAIN-1 & MAIN-2 PROTECTION FOR AUTO TRANSFORMER ADOPTED IN ONE AND HALF CIRCUIT BREAKER SCHEME PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

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.

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 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

31.5, 50

220 / 33

6

220 / 66

7

31.5, 50 & 100 100, 200 & 250

400 / 132

8

100 & 160

220 / 132

9

315, 500 & 630

400 / 220

10

1000 & 1500

765 / 400

HV & LV REF 64

HV

LV

3 OL + 1 EL (51)

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

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 HIGH IMPEDANCE DIFFERENTIAL RELAY 87TH IS 3-PH HIGH IMPEDANCE DIFFERENTIAL RELAY (PRINCPLE : CIRCULATING CURRENT)

5

BACK UP PROTECTION

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

132 / 33

87 TH / 64 REF

16 , 31.5 50 & 80

HV REF (64)

4

132 / 11

NIL

3

MAIN-2

PROTECTION

87 TL DIFFERENTIAL RELAY

66 / 33

2

MAIN-1

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

66 / 11

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

T Y P E

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

1

VOLTAGE RATIO IN KV

3 OVER LOAD + 1 EARTH FAULT RELAY ( 51 )

CAPACITY S.No IN MVA

OVER LOAD ALARM RELAY + NEUTRAL CURRENT E/F RELAY

ICT BUSHING CT INFORMATION S.No

ITEM /MVA

1

CORE

2

RATIO

100 160 315 500

HV 1

2

600/1 800/1 1000/1 1600/1

300/1 500/1 600/1 1000/1

IV

NEUTRAL

3

1

2

--

600/1 800/1 1000/1 1600/1

500/1 800/1 1000/1 1600/1

LV

3

1

2

3

--

600/1 800/1 1000/1 1600/1

600/1 800/1 1000/1 1600/1

--

NEUTRAL BUSHING CT : CORE-1 : BEFORE STAR FORMATION IN RYB PHASES, CORE-2 : AFTER STAR FORMATION FOR 100, 160, 315 MVA TRANSFORMERS

6 7

MET

WTI

0.2 CL AND BURDEN 30 VA ISF:5

MET

WTI

600 V 800 V 1000 V 1600 V 1.5 2.0 2.5 4.0 100 80 60 25 PS 87/64 REF

600 V 800 V 1000 V 1600 V 1.5 2.0 2.5 4.0 100 80 60 25 PS NCT PROT

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

5

0.2 CL AND BURDEN 30 VA ISF:5

600 V 800 V 1000 V 1600 V 1.5 2.0 2.5 4.0 100 80 60 25 PS 87/64 REF


4

600 V 800 V 1000 V 1600V 1.5 2.0 2.5 4.0 100 80 60 25 PS 87/64 REF

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

3

100 VKNEE FOR 160 PS & VA 315 FOR MET 500 100 160 RCT IN OHMS 315 500 100 I MAGNETISING 160 IN mA at 315 VKNEE 500 CLASS OF ACURACY PURPOSE

WTI

MAIN / DIFFERENTIAL PROTECTION FOR AT/F (4 CT METHOD)

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

CLASS: PS

5S1

5S1

5S1

5S3

5S3

5S3

3 3 3

CORE-5 CTR: 1200-800/1A

CLASS: PS

5S3

5S3

5S3

5S4

5S4

5S4

CLASS: PS

P2 P2 P2

AUX.CT Y/ 0.91 / 0.577A

CT MB

3 3 3

CTR: 2000-1000-500/1A

CT MB

P2 P2 P2 LV-CT

2-ACT CORE-5

87 T1

AUX.CT Y/ 0.689 / 0.577A

CT MB

AUX.CT Y/ 0.91 / 0.577A

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 / DIFFERENTIAL PROTECTION FOR AT/F (5 CT METHOD) 87 T1

CTR: 2000-1000-500/1A

CLASS: PS

3 3 3

CORE-5

5S4

5S4

5S4

5S3

5S3

5S3

AUX.CT Y/ 0.689 / 0.577A

3-TCT

CT MB

AUX.CT Y/ 0.91 / 0.577A

P2 P2 P2

CT MB

5S1

5S1

5S1

5S3

5S3

5S3

3 3 3

P2 P2 P2 LV-CT 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

SELECTION OF AUX.CTs FOR DIFFERENTIAL PROTECTION ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾

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 : 2000-1000-500/1A 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: 1200-800/1A. 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.

BACKUP PROTECTION FOR AT/F HV (4 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

CLASS: PS

50Z

IN4 / C471

VB11 / E151

VY11 / E131

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

3 3 3 E172 E174

4S3

4S3

4S3

4S4

4S4

4S4

CLASS: PS

P2 P2 P2

3

3 3

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

CT MB

3 3 3

CTR: 2000-1000-500/1A

VR11 / E111

VN11 / E171

2-ACT CORE-4

IR4 / C411 IY4 / C431 IB4 / C451

CORE-1 VA : 200

IB4 / C451 IY4 / C431 IR4 / C411

CLASS: 3P

BACKUP PROTECTION FOR AT/F HV (5 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-1 VA : 200

CLASS: 3P

BACKUP PROTECTION FOR AT/F LV P1 P1 P1

CT MB

LV-CT CTR: 1200 – 800 /1A

3 3 3

CORE-4

4S2

4S2

4S2

4S1

4S1

4S1

CLASS: PS

50Z

IR4 / C411 IY4 / C431 IB4 / C451

VR11 / E111

IN4 / C471

VB11 / E151

VY11 / E131

VN11 / E171

3 3 3

P2 P2 P2

E172 E174

3

3 3 VOLTAGE

SELECTION BUS-1 PT / BUS-2 PT CORE-1 VA : 200

CLASS: 3P

MISCELLENEOUS RELAYS & PROTECTIONS ADOPTED FOR AUTO TRANSFORMER IN ONE AND HALF CIRCUIT BREAKER SCHEME (OVER FLUX & REF FUNCTIONS) PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

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

99 T HV

BUS-1 PT / BUS-2 PT CORE-1 VA : 200

CLASS: 3P


CLASS: 3P

99 T LV

315MVA, 400KV/220KV/33KV AT/F RESTRICTED EARTH FAULT RELAY P2 P2 P2 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

315MVA, 400KV/220KV/33KV AT/F 3-PH HIGH IMPEDENCE DIFFERENTIAL RELAY P2 P2 P2 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

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 CVT BUS-2 CVT LINE CVT

If AT/F is feeding from Bus-1 and 1-52CB & 2-52CB is closed. Then Bus-1 CVT is selected and this supply is extended to Control & Relay Panels for Auto Transformer. If AT/F is feeding from Bus-2 and 3-52 CB is closed & 2-52CB is open. Then Bus-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 2-52CB is closed & 1-52 CB & 3-52 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

4

SPARE

R

R

Y

B

5

6

7

R

Y

B

MAIN-1 & MAIN-2 PROTECTION FOR SHUNT REACTOR ADOPTED IN ONE AND HALF CIRCUIT BREAKER SCHEME PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

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 SINGLEPHASE 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. 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<)(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 1-CT

3-52CB P2

P2

3 3-CT

3

P1

P1

1-89A

.

UUU

1-PH NEUTRAL GROUNDING REACTOR

UUU

IL

LINE SHUNT REACTOR

2-CT

1-89L

2-89A

2-52CB

P2

2-89B 3-89R

UUUU

.

P1

3

1-89R

3-89A

LINE 1

BUS SHUNT REACTOR

REACTOR BUSHING CT INFORMATION CAPACITY OF 400KV REACTORS : 50, 63, 80, 125 MVAR Sr NO 1

SHUNT REACTOR ITEM

400KV / LINE SIDE

CORE-2 CORE -3 CORE-4

3 RCT IN OHMS 1 OHM

1 OHM

CLASS OF ACURACY

PS

PS

PURPOSE

87 R DIFF

64 R REF1

200V

1000500250V

1000500250V

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

PS

OHM

OHM

PS

PS

FOR 21L2 FOR 21L1 21 R /TEED-2 / /TEED-1 / MET IMP BBC BBM


200V

5

CORE-1

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

VKNEE FOR PS 2 & VA FOR 200V MET

4

LINE SIDE EARTH SIDE

STAR / NEUTRAL SIDE

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

RATIO

NGR

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 R DIFF

64 R REF1

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

87R – 3Ph, 2Wdg REACTOR DIFFERENTIAL RELAY EITHER LOW or HIGH IMPEDANCE TYPE.

CORE-2

64R - REACTOR RESTRICTED EARTH FAULT PROTECTION OF1-POLE HIGH IMPEDANCE TYPE. (REF1)

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

87R – 3Ph, 2Wdg REACTOR DIFFERENTIAL RELAY EITHER LOW / HIGH IMPEDANCE TYPE.

CORE-4

64R - REACTOR RESTRICTED EARTH FAULT PROTECTION OF1-POLE HIGH IMPEDANCE TYPE .(REF1)

NEUTRAL GROUNDING REACTOR SIDE CORE-1

64 REF1

--

64 REF2

--

CORE-2

64 REF1

--

64 REF 1 / 2

--

3

3

CORE -2

3 3

3 3

CORE -4

3

3

3

CORE -5

UUU

UUU

UUU

3 3 3

3

CORE -3

3

3

3 3 3

LINE SHUNT REACTOR

3 3

CORE -4

.

CORE -1 CORE -2

CORE -1

UUU

3 3

1-PH NEUTRAL GROUNDING REACTOR

CORE -3

3

3 3

REACTOR BUSHING CT INFORMATION

3

3

CORE -1

CORE -2

3 3 3

3 3 3

3

3

3

CORE -5

UUU

UUU

UUU

CORE -3

3 3 3

3

CORE -3

3

3

3 3 3

BUS SHUNT REACTOR

CORE -2

3

3 3

REACTOR BUSHING CT INFORMATION

3 3

3

3

CORE -4

CORE -1

CORE -4

.

CORE -1 CORE -2

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

VL1

21M1 VBB1

25

VL1 / VL2 OR VBB2

BF 87L

21M2

VL1

CVT

VL1 FEEDER1 / LINE1

79

UUU 64R 21R

79 25

PROTECTION OF BUS REACTOR 21R BUSBAR-2

87BB2

64R

TEED-2 VBB1/VBB2

VL2 / VL1 OR VBB1 CVT VBB2

87R

UUU TEED-1

BF

OR

VL1/VBB1/VBB2

25

BF

VBB2

UUU

VL1 / VBB1 VL2 / VBB2

87R

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

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

P2 P2 P2

RET 670

CT MB

CTR: 200/1A

3 3 3

CORE-1

1S2

1S2

1S2

1S1

1S1

1S1

ACTIVE

START

3S1

3S1

3S2

3S2

3S2

3 3 3

R-CT HV BUSHING

3S1

TRIP

P2 P2 P2 R-CT

CLASS: PS

STAR BUSHING

DISPLAY

CORE-3 CTR: 200/1A

CLASS: PS

C

E

NORMALLY LOW / HIGH IMPEDENCE 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) P2 P2 P2 R-CT HV CORE-1

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 LOW / HIGH IMPEDENCE 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 R-CT STAR CORE-4 CTR: 200/1A

4S1 4S1 4S1

3 3 3

BUSHING CT

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.

4S2 4S2 4S2

CLASS: PS

P2 P2 P2


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 P1 P1 P1

DISPLAY C E

P1 P1 P1 NGR-CT EARTH CORE-2 CTR: 200/1A

2S1 2S1 2S1

3 3 3

BUSHING CT


2S2 2S2 2S2

CLASS: PS

P2 P2 P2


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

P2 P2 P2

CT MB R-CT HV CORE-2

3 3 3

BUSHING CT


TRIP

CTR: 200/1A

CLASS: PS P1 P1 P1

E

R-CT STAR CORE-4 CTR: 200/1A

4S1 4S1 4S1

3 3 3

BUSHING CT

4S2 4S2 4S2

CLASS: PS

P2 P2 P2

1S2

1S2

1S1

1S1

1S1

DISPLAY C

P1 P1 P1

1S2

3 3 3

2S1 2S1 2S1


P1 P1 P1 NGR-CT BUSHING CT CORE - 1 & 2 CTR: 200/1A

CLASS: PS

P1 P1 P1

CT MB

2S1

2S1

2S1

2S2

2S2

2S2

3 3 3

P2 P2 P2

LINE/BUS REACTOR B/U IMPEDANCE PROTECTION

P2 P2 P2

IR3 / A311 IY3 / A331 IB3 / A351

R-CT HV CORE-3 CTR: 200/1A

3 3 3

BUSHING CT

CT MB

3S2

3S2

3S2

3S1

3S1

3S1

IN3 / A371

REL 670 ACTIVE START

TRIP

CLASS: PS

DISPLAY C

VR11 / E111 VY11 / E131 VB11 / E151 VN11 / E171 CVT SELECTION BUS-1 CVT / BUS-2 CVT / LINE CVT CORE-1 VA : 200

E

CLASS: 3P

LINE REACTOR PROTECTION FOR LINE P2 P2 P2

3 3 3

CTR: 2000-1000-500/1A

(MAIN-1 PROTECTION) IR5 / A511 IY5 / A531 IB5 / A551

1-CT CORE-5

CT MB

5S4

5S4

5S4

5S2

5S2

5S2

IN5 / A571


TRIP


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) P2 P2 P2

IR4 / A411 IY4 / A431 IB4 / A451

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

3 3 3

CORE-4

CT MB

4S4

4S4

4S4

4S2

4S2

4S2

IN4 / A471


TRIP


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

CLASS: PS

IN1 4S4

4S4

4S4

4S2

4S2

4S2

3 3 3

CORE-5

IB1 IY1 IR1 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 3-CT(CORE-5), 2-CT(CORE-1) & BR-CT (CORE-5) ARE STARRED AND CONNECTED TO TEED-1 PROTECTION

BUS REACTOR TEED-2 PROTECTION CT MB

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

3 3 3

CORE-4

4S4

4S4

4S4

4S2

4S2

4S2

CLASS: PS

CT MB

RET 670 ACTIVE

START

RAICA LBB/BFR

P2 P2 P2

RAICA LBB/BFR

{BAY3&2} P2 P2 P2

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 CTR: 2000-1000-500/1A

CLASS: PS

3 3 3

CORE-4

C 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 MULTI FUNCTION PANEL METERING 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

OVER EXCITATION/FLUX RELAY {FOR LINE & BUS REACTORS} VOLTAGE SELECTION


CLASS: 3P

RATUB

BUS-1 PT /

V/F RELAY LINE

CORE-1

RATUB V/F RELAY BUS

BUS-2 PT VA : 200

CLASS: 3P

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. 87R REACTOR DIFFERENTIAL RELAY RET 670 21R REACTOR IMPEDENCE RELAY REL 670

ABB NSD 50

LINE PROTECTION COUPLER PANEL-1

DC +VE FROM PANEL

64R RESTRICTED EARTH FAULT RELAY

RET 670 REACTORS INTERNAL FAULTS

G4AD V9LC 2

GROUP-1/A TRIPPINGS

G4AD V9LC 1 87R 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

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 SRISAILAM-2 MAIN-2 RAZFE PROT TRIP 400KV SRISAILAM-2 MAIN-1 REL100 PROT START’Y’ 400KV SRISAILAM-2 MAIN-1 REL100 PROT START’R’ 400KV SRISAILAM-2 MAIN-1 REL100 PROT TRIP 400KV SRISAILAM-2 MAIN CB 752 Y-PH OPEN 400KV SRISAILAM-2 MAIN-2 RAZFE CARRIER SEND 400KV SRISAILAM-2 AT/F-2 TIE CB 852 B-PH OPEN 400KV SRISAILAM-2 MAIN CB 752 R-PH OPEN 400KV SRISAILAM-2 MAIN CB 752 B-PH OPEN 400KV SRISAILAM-2 AT/F-2 TIE CB 852 Y-PH OPEN 400KV SRISAILAM-2 AT/F-2 TIE CB 852 R-PH OPEN 400KV SRISAILAM-2 MAIN-1 REL100 CARRIER SEND 400KV SRISAILAM-2 CARRIER PROT CH-2 RECEIVED 400KV SRISAILAM-2 CARRIER PROT CH-1 RECEIVED 400KV SRISAILAM-2 MAIN-2 RAZFE PROT TRIP RESET 400KV SRISAILAM-2 MAIN-2 RAZFE CARRIER SEND RESET 400KV SRISAILAM-2 MAIN-1 REL100 START ‘R’ RESET 400KV SRISAILAM-2 MAIN-1 REL100 PROT TRIP RESET 400KV SRISAILAM-2 MAIN-1 REL100 START ‘Y’ RESET 400KV SRISAILAM-2 MAIN-1 REL100 CARRIER SEND RESET 400KV SRISAILAM-2 CARRIER PROT CH-2 RECEIVED RESET 400KV SRISAILAM-2 CARRIER PROT CH-1 RECEIVED RESET 400KV SRISAILAM-2 MAIN CB 752 B-PH CLOSE 400KV SRISAILAM-2 MAIN CB 752 R-PH CLOSE 400KV SRISAILAM-2 MAIN CB 752 Y-PH CLOSE 400KV SRISAILAM-2 AT/F-2 TIE CB 852 Y-PH CLOSE 400KV SRISAILAM-2 AT/F-2 TIE CB 852 R-PH CLOSE 400KV SRISAILAM-2 AT/F-2 TIE CB 852 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 LZ DIFF RLY OPERATED 11. HV 67 ABCN OPERATED 12. LV 67 ABCN OPERATED 13. 51 O/L RLY OPERATED 14. 64 REF / 87 HZ 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 220 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

PREPARED BY GOPALA KRISHNA PALEPU ADE/MRT(PROTECTION)

CONFIGUARATION OF C & R PANEL CONTROL PANEL

CB RELAY PANEL

LINE PROTECTION PANEL

1. AMMETERS IN 3Phs 2. VOLTMETER WITH SEL. SWITCH 3. WATTMETER 4. VAR METER 5. 20W ANNUCIATION FACIA 6. CB CONTROL (TNC) SWITCH 7. ISO CONTROL (TNC) SWITCH 8. SEMAPHORE FOR EARTH SWITCH 9. INDICATING LAMPS FOR CB G&R 10. INDICATING LAMPS FOR ISO 11. INDICATING LAMPS FOR DC 12. INDICATING LAMPS FOR ISO I/L 13. PUSH BUTTON FOR ANNUNCIATION 14. SYNCHRONISING SOCKET FOR CB 15. SYNCHRONISING SEL.SWITCH 16. PROTECTION TRANSFER 17. MIMIC TO REPRESENT SLD 18. CUTOUT FOR RWTI WITH SEL .SWI. 19. PANEL INDICATING LABEL

1. BREAKER FAILURE RELAY 2. AUTO RECLOSURE RELAY 3. CHECK SYNCHRONISING RELAY 4. CB ALARM RELAYS 5. CB TRIP CKT SUPERVISION RELAYS 6. 3-PH TRIP UNITS 86-GA & 86-GB 7. 1-PH TRIP RELAYS M1, M2 - 1 2 Nos 8. DIRECT TRIP RECEIVE RELAYS 9. DC SUPERVISION RELAYS 10. U/V RELAY E/S I/L 11. CB MULTIPLICATION RELAY 12. TEST TERMINAL BLOCK 13. ENERGY METER 14. AUX RELAYS 15. PANEL INDICATING LABEL

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. AUXILIARY RELAYS 12. MAIN-1 CARRIER SEL.SWITCH 13. MAIN-2 CARRIER SEL.SWITCH 14. CARRIER RECEIVE RELAYS 15. FLAG RELAYS 16. TIMERS 17. PANEL INDICATING LABEL

* IN CASE OF ONE AND HALF CB SYSTEM CONTROL PANEL FOR FULL DIA IS TO BE AVAILABLE

CONFIGUARATION OF C & R PANEL TRANSFORMER PROTECTION PANEL HV PROTECTION PANEL

1. T/F DIFFERENTIAL PROTECTION 2. REF PROTECTION RELAY 3. DIRECTIONAL O/L E/F RELAYS 4. OVER FLUX PROTECTION 5. OVER LOAD PROTECTION 6. VOLTAGE SELECTION RELAYS 7. FUSE FAILURE RELAY 8. AUX RELAYS FOR T/F TROBLES 9. FLAG RELAYS 10. TIMERS 11. CIRCUIT LABEL

MV PROTECTION PANEL

1. DIRECTIONAL O/L E/F RELAYS 2. OVER FLUX PROTECTION 3. NEUTRAL DISPALCEMENT RELAY 4. VOLTAGE SELECTION RELAYS 5. FUSE FAILURE RELAY 6. AUX RELAYS FOR T/F TROBLES 7. FLAG RELAYS 8. TIMERS 9. CIRCUIT LABEL

REACTOR PROTECTION PANEL 1. REACTOR DIFFERENTIAL PROTECTION 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 PANELS FOR LINE, T/F, B/C, TBC, BUS REACTOR (AS & WHEN REQ) 2. COMMON CONTROL PANEL 3. BUS BAR PROTECTION PANELS 4. TRANSFER BUS COUPLER PROTECTION PANEL(IN CASE OF DMT/SMT SCHEME) 5. BUS COUPLER PROTECTION PANEL (IN CASE OF DMT/DB SCHEME) I. NOMINCLATURE FOR PANELS ARE NORMALLY MAIN CB PANEL – RLA, TIE CB PANEL – RTB, HV CB PANEL – RTRA, LV CB PANEL – RTRD LINE PROTECTION PANEL – RLB, HV PROTECTION PANEL – RTRB, LV PROTECTION PANEL – RTRC, LINE REACTOR PROTECTION PANEL – RLRC, BUS REACTOR PROTECTION PANEL – RBRA, BUS BAR PANEL – RBBA, CONTROL PANEL – CP, KP, KT, KBC, KTBC,KL,CCP

400KV INTEGRATED CONTROL PANELS

400KV LINE CB RELAY & PROTN PANEL 4RLA

4RTB

4RLB

79 + 25 (AUTO RECLOSURE + CHECK SYNC RELAY)


50 Z (LBB / BFR)

50 Z (LBB / BFR)

21 MAIN 1

CB TROUBLE ALARAM AND TRIP RELAYS TSR TC-1

DC I & II

CB TROUBLE ALARAM AND TRIP RELAYS

TSR TC-1I

TSR TC-1

DC I & II

TSR TC-1I

21 MAIN 2 86 GR -A

1-PH TRIP RELAYS -6 FOR 21M2

D/T CH-1 RECEIVE RELAYS


59 L1 59 L2 O/V STG-1 O/V STG-1i

BREAKER UNDER VOLTAGE MULTIPLICA RELAY TION RELAY

DC-1I

86 GR -B

DC-1

86 GR -A


21 MAIN 1 21 MAIN 1i AUX RELYS AUX RELYS

87 HIGH TEED-1

87 LOW TEED-2


86 GR -B



D/T CH-2 RECEIVE RELAYS BREAKER MULTIPLICA TION RELAY

400KV LINE + R CB RELAY & PROTN PANEL 4RLA 79 + 25 (AUTO RECLOSURE + CHECK SYNC RELAY)

4RLRB

4RTB

4RLC


75 A 75 B 75 L

50 Z (LBB / BFR)

87 MAIN HIGH IMP

21 MAIN 1


21 IMP DISTANCE

1-PH TRIP RELAYS -6 FOR 21M1 1-PH TRIP RELAYS -6 FOR 21M2

D/T CH-1 D/T CH-2 RECEIVE RECEIVE RELAYS RELAYS UNDER BREAKER VOLTAGE MULTIPLIC ATION RELAY RELAY

DC I & II

86 GR -A

HIGH SPEED

64 REF AUX TRIP RELAYS

TSR TC-1I

21 MAIN 2

DC-1I

86 GR -B

TSR TC-1

DC-1

86 GR -A

TSR TC-1I

DC-1I

DC I & II


DC-1

TSR TC-1

50 Z (LBB / BFR)

59 L1 59 L2 O/V STG-1 O/V STG-1i 21 MAIN 1 21 MAIN 1i AUX RELYSAUX RELYS

87 HIGH TEED-1

87 LOW TEED-2


86 GR -B




400KV ICT HV + IV CB RELAY & PROTN PANEL 4RTRA

4RTRC

4RTRB 75 A 75 B 75 L

75 A 75 B

50 Z (LBB / BFR)

50 Z (LBB / BFR)

87 MAIN 1 LOW IMP

CB TROUBLE ALARAM AND TRIP RELAYS TSR TC-1I

TSR TC-1

87 MAIN 2 HIGH IMP

86 GR -A

86 GR -B

INTER TRIP INTER TRIP RECEIVE RECEIVE RELAYS RELAYS

HIGH SPEED AUX TRIP RELAYS

67 HV

BREAKER MULTIPLICA TION RELAY

99T HV O/F

DC I & II

TSR TC-1I

86 GR -B

DC-1I

86 GR -A

DC I & II

DC-1

TSR TC-1


67 IV

99T IV O/F

ICT / ATF TROUBLES ALARAM & TRIP FLAG RELAYS AUX RLYS FOR HV

AUX RLYS FOR IV

87 HIGH TEED-1

87 LOW TEED-2

AUX RLYS AUX RLYS INTER TRIP INTERTRIP RECEIVE RECEIVE BREAKER MULTIPLICA TION RELAY

400KV BUS REACTOR CB RELAY & PROTN PANEL 4RBRA

4RTB

4RBRB


75 A 75 B

50 Z (LBB / BFR)

50 Z (LBB / BFR)

87 MAIN HIGH IMP

CB TROUBLE ALARAM AND TRIP RELAYS TSR TC-1I

21 IMP DISTANCE

64 REF BREAKER MULTIPLICA TION RELAY

TSR TC-1

DC I & II

86 GR -A

86 GR -B

DC-1I

86 GR -A

DC I & II

DC-1

TSR TC-1


87 HIGH TEED-1

HIGH SPEED AUX TRIP RELAYS 87 LOW TEED-2

TSR TC-1I


86 GR -B




400KV BUSBAR PROTECTION & COMMON CONTROL PANEL 4RBB2 BBM1 + 96 UNITS

4RBB3 BBM2 + 96 UNITS

CONFIGUARATION OF C & R PANEL BUSBAR PANEL 1. BCU-1 2. BCU-2 3. BUSBAR CENTRAL UNIT 4. BUS-1 ES CMR 5. BUS-2 ES CMR 6. DC-1 HEALTHY INDICATION 7. DC-2 HEALTHY INDICATION 8. BUSBAR PROT AUX RELAYS 9. CLOSING AUX RELAYS * IN CASE OF DUPLICATE PROTECTION 2 NOS BUSBAR CENTRAL UNITS ARE AVAILABLE

CB RELAY PANEL

LINE PROTECTION PANEL

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

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

BCU1

BCU1

BCU2

BCU2 BCU3

BUSBAR CENTRAL UNIT

DC -1 DC -2

89BB2 AE CMR

Bus Bar Aux relays

89BB1 AE CMR

89BB2 AE CMR

89BB1 AE CMR

BUSBAR CENTRAL UNIT Bus Bar Aux relays

DC -1 DC -2

¾ APTRANSCO IS FOLLOWING SINGLE BUS BAR PROTECTION. ¾ POWERGRID IS FOLLOWING DUPLICATE BUS BAR PROTECTION. ¾ ABB, AREVA, SIEMENS, TOSHIBA ARE HAVING DISTRIBUTED ARCHITECTURE. ¾ ABB, AREVA, GE, ER, ERL PHASE, SEL ARE HAVING CENTRALISED ARCHITECTURE. ¾ LBB IS THE PART OF BUSBAR IS LATEST CONCEPT. ¾ INCASE OF DISTRIBUTED ARCHITECTURE BAY/PERIPHERAL UNIT IS DATA AQUSITION UNIT AND COMMUNICATE TO CENTRAL UNIT THROUGH FIBER OPTIC CABLE. ¾ DICTRIBUTED/ CENTRALISED ARCHITECTURE - LBB IS INBUILT LOGIC. 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

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

DC-1

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

DC-2

CB 1&2 TROUBLES HEALTHY & ALARMS LEDS

96 50Z

A/R+SC 79+25

64R

21L2



Reactor Trouble Alarms & Trips

21R

59-1&2 CB PB

BAY2 BCU

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

DC-1

A/R+SC 79+25

87R

21L1

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

DC-2

BAY1 BCU

50 ZT

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

99R

CB PB

400KV ICT CB RELAY & PROTN PANEL 4RTRA3

75A,B,L

LBB/ BU 50Z

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

DC-1

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

DC-2

50 ZT

CB PB

LV BAY BCU

LBB/ BU 50Z

LBB/ BU 50Z

87T2

TRIP COIL


86 GR-A 86 GR-B

DC-1

TRIP COIL


87T1

BAY3 BCU

DC-2

A/R+SC 79+25

75A,B

Transformer Trouble Alarms & Trips

67HV

Inter 96/ Trip 50Z Relays CB PB

MFM

67IV

TRIP COIL


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

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

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

DC-1

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

DC-2


96 / 50Z

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


96 50Z

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

DC-1

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

DC-2

86 GR-B

CB PB

50/51 A,B C,N

TRIP COIL


DC-1

86 GR-A

LBB/ BU 50Z

DC-2


A/R+SC 79+25

BS BCU

96 50Z

CB PB

LBB/ BU 50Z



DC-1

BC BCU

LBB/ BU 50Z

2RBC

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 Alarm Unit

BCU6 For Fire Fighting System

BCU7

BCU8

For Diesel Generator System

For fire & Smoke Detector

BCU9

BCU10 COM581

Alarm Unit

Main Server ABB Network Partner AG

COM581

Redunt Server ABB Network Partner AG

COM581

C E

C E

Communication Gateway Network Partner

SSLTA 88 SERVICE RS232


Hot Standby

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

ACQR LOCK

GPS 166 SATELLITE CONTROLLED CLOCK

NORMAL OPERATION WED 11.12.1996 MEZ 11.42.25 SV 24 > SYN

MENU CLR 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 & 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-A

GROUP-A

MAIN-1 PROTECTION M1 BUILT IN FUNCTIONS TEED-1 PROTECTION OVER VOLTAGE STAGE-1 PROT DIRECT TRIP CHANNEL-1 RECEIVED

T/F DIFFERENTIAL RELAY T/F HV BACKUP RELAY T/F IMP / 21T RELAY T/F HV OVERFLUX RELAY OIL TEMP HIGH TRIP PRESURE RELIEF TRIP TERITIARY DELTA WNDG NDR PROT

REACTOR DIFFERENTIAL RELAY REACTOR BACKUP / 21R RELAY OIL TEMP HIGH TRIP PRESURE RELIEF TRIP

GROUP-B MAIN-2 PROTCTION M2 BUILT IN FUNCTIONS TEED-2 PROTECTION OVER VOLTAGE STAGE-2 PROT LBB/BFR RELAY DIRECT TRIP CHANNEL-2 RECEIVED

GROUP-B T/F REF / HIGH Z DIFF RELAY BUCHHOLZ TRIP T/F LV BACKUP RELAY T/F NEUTRAL CURRENT / 51 O/C RLY T/F LV OVERFLUX RELAY OVER LOAD PROT (ALARM ONLY) OLTC BUCHHOLZ TRIP WINDING TEMP HIGH TRIP LOW/ HIGH OIL LEVEL TRIP

GROUP-B REACTOR REF RELAY 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

INITIATE SCADA (DR & SOE)

X

INITIATE ALARM

X

X

BLOCK T_CB A/R RELAY

1-PH

X

BLOCK M_CB A/R RELAY

B

START T_CB A/R RELAY

21 M2

X

START M_CB A/R RELAY

MAIN-2 PROTECTION

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

X

INITIATE T_CB 3PH TRIP UNIT GR-A

1-PH


OUTPUT

A

INITIATE M_CB 3PH TRIP UNIT GR-B

GROUP

21 M1


SYMBOL

MAIN-1 PROTECTION

INITIATE M_CB 3PH TRIP UNIT GR-A

PROTECTION RELAY


MAIN CB FOR LINE (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 (1-52 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-1 & COIL-2

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

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

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

252 INITIATE T_CB 3PH TRIP UNIT GR-A

252 INITIATE T_CB 1PH TRIP UNIT GR-A

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

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

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 (3-52CB)TRIPPING LOGICS

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

87 T LZ

21 MAIN 1

86-A MTR/ HSTR

C

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-B ABB REL521 MTR/ MAIN-1 HSTR

1

9

2 3 4 5 6

10 11 12 13 14

7 8

15 16

C

E

86-A MTR/ HSTR

1

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-B MTR/ HSTR

E

86-A : GROUP-A MASTER TRIP RELAY / HIGH SPEED TRIP RELAY 86-B : GROUP-B MASTER TRIP RELAY / HIGH SPEED TRIP RELAY

MAIN-1/ MAIN-2 ZONE-1 & SINGLE PHASE FAULT 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) TO DISTURBANCE RECORDER

E

TO EVENT RECORDER ( SOE/ SCADA ) TO LBB/BFR INITIATION

AUTO RECLOSURE

¾

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 3-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-1 FAULT ONLY.

¾

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

REL 521

CARRIER SIGNAL ACTIVE START RECEIVED & ZONE-2 STARTER IS PICKUP CONDITION

TRIP

C

E

REL 316 ACTIVE

START

BLOCK MAIN CB AUTO RECLOSURE BLOCK TIE CB AUTO RECLOSURE

DISPLAY

CARRIER SIGNAL RECEIVED & ZONE-2 STARTER IS PICKUP CONDITION

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

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/ MAIN-2 ZONE- 3/4/5 & 1 / 2 / 3 PHASE FAULT 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

TO EVENT RECORDER ( SOE/ SCADA )

DISTANCE SCHEME TRIPPING OUTPUTS TIE CB

MAIN CB CO

CO

186 R

186 R

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 CO

CO

286 R

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



C 286 B

E TO TRIP COIL-1 TO TRIP COIL-2

MAIN LBB

INITIATION 1-PH TRIP RELAYS OF MAIN-1 PROTECTION

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

RAICA 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


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 )

RAICA 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


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)

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) INITIATE ALARM (ANNUNCIATION COME)

E

TO DISTURBANCE RECORDER TO EVENT RECORDER ( SOE/ SCADA )

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/ MAIN-2 OVER VOLTAGE STAGE-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

INITIATE TIE CB 86-GR-A 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

C

E

REL 316

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

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 STAGE-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 SEND

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

CHANNEL-2 SEND

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 : 5. MAIN CB 50 LBB/BFR OPERATED. 6. TIE CB 50 LBB/BFR OPERATED. IT SENDS SIGNAL PARALLEL VIA 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. 9. 87 TEED-1 PROTECTION OPERATED CHANNEL. 10. 87 TEED-2 PROTECTION OPERATED

CHANNEL-1 RECEIVE

MAIN-1 PROTECTION : 1. 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 RECEIVE

MAIN-2 PROTECTION : 1. 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


DIRECT TRIP CHANNEL-1 RECEIVED SOTF PROTECTION (INBUILT MAIN-1) DEF,TOC, BOC, STUB (INBUILT MAIN-1) TEED-1 PROTECTION

86-GA MASTER TRIP / HIGH SPEED TRIP RELAY

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

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

MAIN CB

OVER VOLTAGE STAGE-1 (INBUILT MAIN-1)

TIE CB

TRIP COIL-2


TRIP COIL-1

TRIP COIL -1

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 )

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

RET 670 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 521

64 T2 REF (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


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


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

START

TRIP

99T LV


DISPLAY


C

E


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

ABB O/V – 1 O/V – 2

86-A MTR/ HSTR

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

(BAY 1&2)

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

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 NUMERICAL RELAYS. IF EXTERNAL RELAYS ARE UTILISED THEN STAGE-1 IS GR-A & STAGE-2 IS GR-B TRIPPING IS TO UTILISED.

86-A MTR/ HSTR

86-B MTR/ HSTR

86-B MTR/ HSTR

TRIP COIL-2

86-B MTR/ HSTR

LV - CB (BAY LV)

ABB RATUB O/F- LV

TRIP COIL-1

86-A MTR/ HSTR

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

START

TRIP

NDR

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


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


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

MAIN CB

T/F DIFFERENTIAL RELAY 87 T

TIE CB

TRIP COIL-2


TRIP COIL-1

TRIP COIL -1

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

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 GR-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 GR-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 COIL-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

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

S.NO

ISOLATOR OPEN/CLOSE

EQUIPMENT-1

EQUIPMENT-2

EQUIPMENT-3

EQUIPMENT-4

INTERLOCKS REQUIRED FOR CONCERNED ISOLATOR / EARTH SWITCH OPEN OR CLOSE

BAY - 1 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

& OPERATION

OPEN 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

LOCAL CLOSE

& 1-52CB

CLOSE CLOSE

&

& 2-52CB

OPEN 3-89A

OPERATION

&

LOCAL CLOSE

& 3-52CB

RESET RESET

REMOTE CLOSE

& 1-52CB

OPEN

&

OPERATION

1-89E

86GR-A 86GR-B

OPEN OPEN

&

OPERATION

1-89AE

3-89T

OPERATION

ACTED

&

OPERATION

1-89LE

OPEN OPEN

86GR-A 96BB

OPEN

2-89B

& OPERATION 2-89A

RESET

REMOTE CLOSE

& 2-52CB

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

OPEN

OPEN

&

3-89AE

OPEN OPEN

3-89E 3-52CB 3-89TE 2-52CB LV89E2

OPEN 3-89E

OPERATION

&

OPEN

3-89 3-89A

OPEN 86GR-B

OPEN

RESET

OPEN

OPEN

RESET

BB289E

OPEN OPEN

LOCAL CLOSE

CLOSE CLOSE

3-89

OPERATION

OPEN

2-89A 2-52CB

OPEN

2-89A 2-89B

RESET RESET RESET

&

REMOTE CLOSE

3-89AE

3-52CB 3-89TE

OPERATION

OPERATION

&

OPEN OPEN

&

OPEN

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

OPEN OPEN

& OPERATION 2-89AE

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 GR-A

86 GR-B + VE T N C

21M1 AR

MAIN CB

SYN SOCKET

+ve

-ve

CB REMOTE CLOSE

CB AUTO RECLOSE

21M2 AR

86 GR-A

86 GR-B + VE T N C

TIE

AR

TIE CB

SYN SOCKET

+ve

-ve

CB REMOTE CLOSE

CB AUTO RECLOSE

ADVANTAGES & DISADVANTAGES OF ONE & HALF BREAKER SYSTEM A.

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%

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

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

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

79 RESET 79 LOCKOUT

4

A

B

ZONE 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

SEL- 321- 5 - 2

TARGET RESET

TRIP

EN

MC ENABLED

50 51

2ENABLED 3

TRIP

SPT ENABLED

PROTECTION AUTOMATION CONTROL

50 O/C

METER STATUS OTHER GROUP EXIT

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. PRE-FAULT, FAULT & POST-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 ( QUADRILATERAL-1 )

DISTANCE RELAYS CHARACTERESTICS ( QUADRILATERAL-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 MANUFACTURERS

TRANSMISSION LINE PROTECTION CURVES

MAIN-2 REL 316 REL 512 MICOM P437 E-PAC 3000, OPTIMHO

CURVES

T/F PROTECTION DIFFERENTIAL RET 521 / 670 RET 316

DIR O/L,E/F REL 505 REX 521

QUAD/ MHO

MICOM P633 KBCH/ MBCH

MICOM P141 MICOM P127

AREVA (ALSTOM)

MAIN-1 REL 521 REL 670 MICOM P443/P444/ P442/P445

SIEMENS ( SIPROTEC )

SIPROTEC 7SA62/3

QUAD/ MHO

SIPROTEC 7SA522

QUAD/ MHO

7UT 613/ 2 7UT 513/ 2

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

SEL

SEL 421

QUAD/ MHO

SEL 321 SEL 311C

QUAD/ MHO

SEL 387

SEL 351

GE MULTILIN

D-60, ALPS

QUAD/ MHO

L-60/L-90 D-30

QUAD/ MHO

T-35 / T-60 SR 7465

F-60 SR 750/60

EASUN REYROLL

THR 4 PE 24

MHO

MHO

---

MIT

NXT PHASE

L-PRO

QUAD/ MHO

L-PRO

LENS/ TOMAT0

T-PRO

F-PRO

VA TECH REYROLL

OHMEGA 402

QUAD/ MHO

OHMEGA 311/308

QUAD/ MHO

DUOBIAS M

ARGUS

ABB

QUAD

QUAD/ MHO

THR 4 PE 16

THR 3 PE 18

QUAD/ BULLET

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 P44 2/3/4

MICOM P543/547

MICOM P633/P643

REB 670 REB 500 MICOM P74 1/3/6

GE D 25 MULTILIN SIEMENS SIPROTEC

F 60

D 60, D 90

L 60, L 90

T 60

B 90, B 30

SIPROTEC

SIPROTEC

SIPROTEC

SIPROTEC

SIPROTEC

( SIPROTEC )

6MD66/3

7SJ 62/3/4

7SA 522/6..

7SD 522/61_

7UT 633/13/2

7 SS 52

SEL

SEL 451-4

SEL 451

SEL 421/321

SEL 487E

TOSHIBA

GRD 150

GRD 140

GRZ 100

SEL 387L GRL 100 / 150

SEL 487B GRB 100/150

GRT 100

RELAY TESTING EQUIPMENTS 1. PROGRAMA_GE (MODEL: FREEJA-300) 3. OMICRON (MODEL: CMC 256-6)

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.

MAMIDIPALLY (HYDERABAD)

3 X 315 MVA

1. SRISAILAM 1&2 2. GHANAPUR (PGCIL)

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

2.

NURNOOR (KURNOOL)

(2 + 1**) X 315 MVA

1. SRISAILAM 2. GHANAPUR (PGCIL)

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

3.

KALAPAKA (VISHAKHAPATNAM)

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

2 X 315 MVA

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)

1. TALLAPALLY

2. RAICHUR

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

2. KADAPA

4. 5.

VEMAGIRI (RAJHAMUNDRY) VELTUR (MB NAGAR)

(1 + 2**) X 315 MVA (1 + 1**) X 315 MVA

FEEDERS

6.

CHITTOR(VEPANJIR)

7.

NELLORE(MANUBOLU)

2 X 315 MVA

8.

DICHPALLY (NIZAMABAD)

2 X 315 MVA

1. RAMAGUNDAM

9.

GAJWEL (MEDAK)

2 X 315 MVA

1. RAMAGUNDAM 3. BTPS 1&2**

2. GHANAPUR 4. YEDDUMAILARAM 1&2**

10.

MALKARAM* (SECUNDRABAD)

2 X 315 MVA

1. RAMAGUNDAM 3. VTPS**1&2

2. GHANAPUR

11.

YEDDUMAILARAM** (RR, SHANKARPALLY)

3 X 315 MVA

1. GAJWEL 1&2

2. MAMIDIPALLY 1&2

12.

NARASARAOPETA**(GUNTUR)

2 X 315 MVA

1. SRISAILAM 1&2 2. NUNNA 1&2 (VTPS*)

3. VEMAGIRI 1&2

13.

SURYAPETA** (NALGONDA)

2 X 315 MVA

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

FEEDERS 1. GHANAPUR 1&2 2. GAJWEL(GHNP3) 3. MALKARAM(GHNP4)

4. TALLAPALLY 1&2 5. DICHPALLY 6. KHAMMAM (WRNGL) 7. CHANDRAPUR 1&2

3 X 315 MVA

1. RAMAGUNDAM 1&2 2. MAMIDIPALLY 3. GAJWEL(RMGNDM3)

4. NAGARJUNA SAGAR 5. KURNOOL 6. MALKARAM (RMGNDM4)

2 X315 MVA

1. NUNNA 2. KALAPAKA1&2 5. SIMHADRI**1&2

3. VEMAGIRI 1&2 4. JAIPUR(HVDC) 4. VEMAGIRI 3&4 (#) 5. KHAMMAM 6. NELLORE 1&2 7. KONDAPALLY*1&2

4.

NUNNA (VIJAYAWADA)

2 X315 MVA

1. GAJUWAKA 2. SRISAILAM 1&2 (VTPS) 3. VEMAGIRI 1&2

5.

TALLAPALLY (NAGARJUNA SAGAR)

3 X 315 MVA

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

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

2 X 315 MVA

1. RAMAGUNDAM (WGL) 2. NUNNA 5. KTPS**1&2

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

6.

BUDIDAMPADU (KHAMMAM)

7.

GOOTY

2 X 315 MVA

1. TALLAPALLY 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

2. ALAMATHI 1&2 (NLR765**)

10.

MULUGU* (WARANGAL)

1. RAMAGUNDAM 2. KHAMMAM

3. BTPS(KTPS)* 1&2

2 X 315 MVA

1. RAMAGUNDAM TO GHANAPUR CKT-2 IS PROPOSED TO TAKE LILO AT MALKARAM (APTRANSCO) SS. 2. RAMAGUNDAM TO KHAMMAM CKT IS PROPOSED TO TAKE LILO AT WARANGAL SS. 3. 765KV KURNOOL IS ABOUT TO START, 765KV DC TO RAICHUR & 400KV KUMPP-DC, KNL 400-DC, LILO TLPLY-GOOTY. 4. 765KV NELLORE IS UNDER FORMULATION STAGE. 5. 765KV EITHER EAST GODAVARI OR SRIKAKULAM IS UNDER FORMULATION STAGE.

400KV NETWORK IN AP DICHPALLY CHANDRAPUR TALLAPALLY (MAHARASTRA)

IPP4 KTPS

VEMAGIRI

SRISAILAM

MBNGR

GOOTY CHITTOR

RAICHUR MAMIDIPALLY

CHENNAI

GUNTUR(NRPT)

KADAPA

KOLAR

MALKARAM NLR**765 ALAMETHI / CHENNAI

KHAMMAM

KRNL 765

KPPTS

BANGALORE

VTPS SURYAPETA

NELLORE

KPPTS

KURNOOL

BANGALORE

NUNNA

GHANAPUR

KRNL 765

IPP2 YEDDUMAILARAM

IPP1

MALKARAM

IPP3

BTPS

GAJWEL

KALAPAKA

WARANGAL

HVDC

JAIPUR

RAMAGUNDAM

SIMHADRI

GAJUWAKA

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

DISPLAY

Protection System-1

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