gk presentation

400KV PROTECTIONPREPARED BY

GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)

[email protected], Mobile:9440336984

BASICS OF

ONE AND HALF CIRCUIT BREAKER

SCHEMEPREPARED BY


ONE & HALF BREAKER DESCRIPTIONBUS-1

BUS-2

BUS-1 BUS-2

1. IN THIS TWO BUSES ARE PRIOVIDED.


BUS-2

BUS-1 BUS-2

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


BUS-2

BUS-1 BUS-2

1-52 CB

2-52 CB

3-52 CB

1-52 CB

2-52 CB

3-52 CB

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


BUS-2

BUS-1 BUS-2

1-52 CB

2-52 CB

3-52 CB

1-52 CB

2-52 CB

3-52 CB

LINE-1

LINE-2

LINE-1 LINE-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.


BUS-2

BUS-1 BUS-2

1-52 CB

2-52 CB

3-52 CB

1-52 CB

2-52 CB

3-52 CB

LINE-1

LINE-2

LINE-1 LINE-2

6. LINE-1 HAVING TWO FEEDING PATHS i.eA. VIA BUS-1 & 1-52 CBB. VIA BUS-2, 3-52 CB & 2-52 CB

7. LINE-2 HAVING TWO FEEDING PATHS i.eA. VIA BUS-2 & 3-52 CBB. VIA BUS-1, 1-52 CB & 2-52 CB


BUS-2

BUS-1 BUS-2

1-52 CB

2-52 CB

3-52 CB

1-52 CB

2-52 CB

3-52 CB

LINE-1

LINE-2

LINE-1 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.


BUS-2

BUS-1 BUS-2

1-52 CB

2-52 CB

3-52 CB

1-52 CB

2-52 CB

3-52 CB

LINE-1

LINE-2

LINE-1 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.


BUS-2

BUS-1 BUS-2

1-52 CB

2-52 CB

3-52 CB

1-52 CB

2-52 CB

3-52 CB

LINE-1

LINE-2

LINE-1 LINE-2

13. SO THESE TWO FEEDERS CONTROLLED BY THREE CIRCUIT BREAKERS IT IS CALLED ONE & HALF BREAKER SYSTEM.

11. NORMALLY IN ALL TYPES OF BUSBAR CONFIGUARATIONS ONE BREAKER IS SUFFICIENT FOR ONE FEEDER.

12. HERE TWO FEEDERS ARE CONTROLED BY THREE BREAKERS.


BUS-2

BUS-1 BUS-2

1-52 CB

2-52 CB

3-52 CB

1-52 CB

2-52 CB

3-52 CB

LINE-1

LINE-2

LINE-1 LINE-2

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

MA

IN B

AY(

1ST

BA

Y) F

OR

FEE

DER

-1

MA

IN B

AY(

1STB

AY)

FO

R F

EED

ER-1


BUS-2

BUS-1 BUS-2

1-52 CB

2-52 CB

3-52 CB

1-52 CB

2-52 CB

3-52 CB

LINE-1

LINE-2

LINE-1 LINE-2

MA

IN B

AY(

1ST

BA

Y) F

OR

FEE

DER

-1

MA

IN B

AY(

1STB

AY)

FO

R F

EED

ER-1

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

TIE

BA

Y (2

ND

BA

Y ) F

OR

FEE

DER

-1 &

2

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


BUS-2

BUS-1 BUS-2

1-52 CB

2-52 CB

3-52 CB

1-52 CB

2-52 CB

3-52 CB

LINE-1

LINE-2

LINE-1 LINE-2

MA

IN B

AY(

1ST

BA

Y) F

OR

FEE

DER

-1

MA

IN B

AY(

1STB

AY)

FO

R F

EED

ER-1

TIE

BA

Y (2

ND

BA

Y ) F

OR

FEE

DER

-1 &

2


MA

IN B

AY(

3RD

BA

Y) F

OR

FEE

DER

-2

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

MA

IN B

AY(

3RD

BA

Y) F

OR

FEE

DER

-2


BUS-2

BUS-1 BUS-2

1-52 CB

2-52 CB

3-52 CB

1-52 CB

2-52 CB

3-52 CB

LINE-1

LINE-2

LINE-1 LINE-2

MA

IN B

AY(

1ST

BA

Y) F

OR

FEE

DER

-1

MA

IN B

AY(

1STB

AY)

FO

R F

EED

ER-1

TIE

BA

Y (2

ND

BA

Y ) F

OR

FEE

DER

-1 &

2


MA

IN B

AY(

3RD

BA

Y) F

OR

FEE

DER

-2

MA

IN B

AY(

3RD

BA

Y) F

OR

FEE

DER

-2

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)


BUS-2

BUS-1 BUS-2

1-52 CB

2-52 CB

3-52 CB

1-52 CB

2-52 CB

3-52 CB

LINE-1

LINE-2

LINE-1 LINE-2

MA

IN B

AY(

1ST

BA

Y) F

OR

FEE

DER

-1

MA

IN B

AY(

1STB

AY)

FO

R F

EED

ER-1

TIE

BA

Y (2

ND

BA

Y ) F

OR

FEE

DER

-1 &

2


MA

IN B

AY(

3RD

BA

Y) F

OR

FEE

DER

-2

MA

IN B

AY(

3RD

BA

Y) F

OR

FEE

DER

-2

GOPALA KRISHNA PALEPU ADE/MRT/ T&C/400KV SS/O/O CE/400KV / L&SS/ VS

APTRANSCO, [email protected]

Mobile: 9440336984

SUBSTATION DESIGN/LAYOUT (I-CONFIGUARATION)

FEEDER2 FEEDER4 FEEDER6 FEEDER8 FEEDER10 FEEDER12


BUS-2

BUS-1

BA

Y1B

AY2

BA

Y3

BA

Y4B

AY5

BA

Y6

BA

Y7B

AY8

BA

Y9

BA

Y10

BA

Y11

BA

Y12

BA

Y13

BA

Y14

BA

Y15

BA

Y16

BA

Y17

BA

Y18

DIA1 DIA2 DIA3 DIA4 DIA5 DIA6

SUBSTATION DESIGN/LAYOUT(D-CONFIGUARATION)

BUS-2

BUS-1



BA

Y1

BAY2

BA

Y3

BA

Y4

BAY5

BA

Y6

BA

Y7

BAY8

BA

Y9

BA

Y10

BAY11B

AY1

2

BA

Y13

BAY14

BA

Y15

BA

Y16

BAY17

BA

Y18

DIA1

DIA2

DIA3

DIA4

DIA5

DIA6

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

FEEDER1

BA

Y1

BA

Y2

BA

Y3

BA

Y4FEEDER2

FEEDER3

BA

Y5

BA

Y6

BA

Y7

BA

Y8

FEEDER4

FEEDER1

BUS-2

BUS-1

BA

Y1B

AY2

BUS-2BUS-1

FEEDER2

BA

Y3B

AY4

FEEDER3

BA

Y5B

AY6

BA

Y7B

AY8

FEEDER4

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

MESH / RINGLAYOUT

FEEDER 1 FEEDER 2

FEEDER 3

FEEDER 4FEEDER 5FEEDER 6

FEEDER 7

FEEDER 8

1-52 CB 2-52 CB

3-52 CB

4-52 CB

5-52 CB6-52 CB

8-52 CB

7-52 CB

SUBSTATION DESIGN/LAYOUT(DOUBLE MAIN BUS & TRANSFER BUS SYSTEM)

FEEDER1

BUS-2

BUS-1

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

FEEDER2

TRA

NSF

ER B

US

CO

UPL

ER

T/F-1 T/F-2

BU

S C

OU

PLER

TRANSFER BUS

FEEDER3 FEEDER4

BAY1 BAY2BAY3 BAY4 BAY5

BAY6 BAY7 BAY8

SUBSTATION DESIGN/LAYOUT(DOUBLE MAIN BUS & CB BYPASS ISO SYSTEM)

FEEDER1

BUS-2

BUS-1

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

T/F-1

BU

S C

OU

PLER

FEEDER2

T/F-2

FEEDER3 FEEDER4

BAY1 BAY2

BAY3

BAY4

BAY5

BAY6 BAY7

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.

SUBSTATION DESIGN/LAYOUT(SINGLE BUS & TRANSFER BUS SYSTEM)

FEEDER1

BUS-1

TRANSFER BUS

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

FEEDER2

TRA

NSF

ER B

US

CO

UPL

ER

T/F-1 T/F-2

FEEDER3 FEEDER4

BAY1 BAY2 BAY3 BAY4 BAY5 BAY6 BAY7

CT METHODS IN


SCHEMEPREPARED BY


DIFFERENT CT METHODS OF ONE & HALF BREAKER SYSTEM

3 CT METHOD

4 CT METHOD

6 CT METHOD

6 CT METHOD

LINE

LINE

LINE

LINE

CB CB CB

CB CB CB

CB CB CB

CB CB CB

AT/F

AT/F

AT/F

AT/F

5 CT METHODLINE

CB CB CB

AT/F

6 CT METHOD

LINECB CB CB

AT/F

ONE & HALF BREAKER SYSTEM

LINE 1

1-89

1-89A

1-52CB

3-89

3-89A

3-52CB

2-52CB2-89A 2-89B

1-89L 3-89T

BUS-1 BUS-2

T/F-1

1-CT3P1

P23-CT

P13

P2

2-CTP1 3 P23

(3CT METHOD)


LINE 1

1-89

1-89A

1-52CB

3-89

3-89A

3-52CB

2-52CB2-89A 2-89B

1-89L 3-89T

BUS-1 BUS-2

T/F-1

1-CT3P1

P23-CT

P13

P2

2-ACT

3

P1P2

2-BCT

3P1 P2

(4CT METHOD)


LINE 1

1-89A

1-52CB

1-CT

3-89

3-89A

3-52CB

3-CT

2-52CB

1L-CT

2-CT

2-89A 2-89B

1-89L 3-89T

BUS-1 BUS-2

T/F-1

3T-CT

1-89

3P2

P13

P2

P1

3P1 P2

3P2

P13P2

P1

(5CT METHOD)


LINE 1

1-89A

1-52CB

1B-CT

3-89

3-89A

3-52CB

3B-CT

2-52CB

2B-CT

2-89A 2-89B

1-89L 3-89T

BUS-1 BUS-2

T/F-1

1-89

3P1

P23

P1

P2

3P1 P23P2 P1

3P2

P13

P2

P11A-CT

2A-CT

3A-CT

(6CT METHOD)


LINE 1

1-89A

1-52CB

1-CT

3-89

3-89A

3-52CB

3-CT

2-52CB

2B-CT

2-89A 2-89B

1-89L 3-89T

BUS-1 BUS-2

T/F-1

1-89

3P2

P13

P2

P1

3P1 P23P2 P1

3P2

P13P2

P11L-CT

2A-CT

3T-CT

(6CT METHOD)


LINE 1

1-89A

1-52CB

1-CT3-89

3-89A

3-52CB

3-CT

2-52CB

2B-CT

2-89A 2-89B

1-89L 3-89T

BUS-1 BUS-2

T/F-1

1-89

3P2

P13P2

P1

3P1 P2

3P2

P1

3P2 P1

3P2

P11L-CT

2A-CT

3T-CT

(6CT METHOD)


LINE 1

1-89A

1-52CB

1B-CT

3-89

3-89A

3-52CB

3B-CT

2-52CB

2B-CT

2-89A 2-89B

1-89L3-89T

BUS-1 BUS-2

T/F-1

1-89

3P1

P23

P1

P2

3P1 P23P2 P1

3P2

P13

P2

P11A-CT

2A-CT

3A-CT

(8CT METHOD)

3P2

P11L-CT 3

P2

P13T-CT

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

CT CT CT CT CT CT

1-1/2 CB SYSTEM (SIEMENS VATECH)

VDVD

DSDSDSDSDSDS

GS

GS

GS

GS

GS

GS GS

GS

VDVD

CB CB CB

DS : DISCONNECTOR SWITCH, GS: GROUNDING SWITCH, CT: CURRENT TRANSFORMER, VD: VOLTAGE DIVIDER

CORE WISE APLICATION OF

CTs INONE AND HALF

CIRCUIT BREAKER SCHEME

PREPARED BYGOPALA KRISHNA PALEPU

ADE/MRT(PROTECTION)

CURRENT TRANSFORMERCONNECTIONS IN 3CT METHOD

BUSBAR-2PROTECTION

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

CORE – 6 ( PS)

BUSBAR-2 CHECKUPPROTECTION (SPARE)

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

FEEDERCORE – 5

( PS)

SPAREMETERING & ENERGY METER FOR FEEDERCORE – 4 (0.5 / 0.2)

METERING & ENERGY METER FOR AT/FSPARECORE – 3 ( 0.5 / 0.2)

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

FOR TRANSFORMER

BUSBAR-1 CHECKUP PROTECTION (SPARE)

CORE – 2 ( PS)

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

BUSBAR-1PROTECTION

CORE – 1( PS)

3 – CT2 – CT1 – CT

CURRENT TRANSFORMER CONNECTIONS IN 3CT METHOD

BUSBAR-2PROTECTION

BUSBAR-2 CHECKUPPROTECTION (SPARE)

SPAREMETERING & ENERGY METER FOR FEEDERCORE – 3 (0.5 / 0.2)

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

FEEDERCORE – 4

( PS)

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

CORE – 5 ( PS)

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.

BUSHING CT METERING

CORE (0.5 / 0.2)

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

FOR TRANSFORMER

BUSBAR-1 CHECKUP PROTECTION (SPARE)

CORE – 2 ( PS)

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

BUSBAR-1PROTECTION

CORE – 1( PS)

3 – CT2 – CT1 – CT


2CT’s SECONDARIES ARE CONNECTED

IN PARALLEL AND CONNECTED TO MAIN PROTECTION

2CT’s SECONDARIES ARE CONNECTED

IN PARALLEL AND CONNECTED TO MAIN-1 PROTECTION

CORE-5 (PS)

2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND

CONNECTED TO BACKUP PROTECTION

AFTER LBB/BFR


CONNECTED TO MAIN-2 PROTECTION

AFTER LBB/BFR

CORE-4 (PS)


CONNECTED TO PANEL METERS & ENERGY METER


CONNECTED TO PANEL METERS & ENERGY METER

CORE-3 (0.5/0.2)

BUSBAR-2 CHECKUP

PROTECTION (SPARE)

SPARESPAREBUSBAR-1 CHECKUP

PROTECTION (SPARE)

CORE-2 (PS)

CT SECONDARY CORE IS

CONNECTED TO BUSBAR-2

PROTECTION

SPARESPARECT SECONDARY CORE IS

CONNECTED TO BUSBAR-1

PROTECTION

CORE-1 (PS)

3-CT2-ACT2-BCT1- CT

CURRENT TRANSFORMER CONNECTIONS IN 5CT METHOD

TEED PROT-1(BAY 2&3)

MAINPROTECTION


MAIN-1PROTECTION

TEED PROT-1(BAY 1&2)CORE-5

(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).


AFTERLBB/BFR

(3-52)

BACKUPPROTECTION


AFTERLBB/BFR

(2-52)

MAIN-2PROTECTION


AFTERLBB/BFR

(1-52)

CORE-4 (PS)

SPAREMETERING &ENERGY METER

SPAREMETERING &ENERGY METER

SPARECORE-3 (0.5/0.2)

BUSBAR-2 CHECKUP

PROTECTION (SPARE)




BUSBAR-1 CHECKUP

PROTECTION (SPARE)

CORE-2 (PS)

BUSBAR-2PROTECTION




BUSBAR-1PROTECTIONCORE-1

(PS)

3-CT3-TCT2-CT1-LCT1-CT


(GIS or AIS with DEAD TANK CBs)

SPARE2CT’s SECONDARIES ARE CONNECTED IN

PARALLEL AND CONNECTED TO

PANEL METERS & ENERGY METER

2CT’s SECONDARIES ARE CONNECTED IN


PANEL METERS & ENERGY METER


BUSBAR-2 CHECKUP PROTECTION

(SPARE)



BACKUP PROTECTION AFTER LBB/BFR



MAIN-2 PROTECTION AFTER LBB/BFR


(SPARE)

CORE-2 (PS)

BUSBAR-2 PROTECTION

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

MAIN-1 PROTECTION

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

MAIN-1 PROTECTION

BUSBAR-1 PROTECTION

CORE-1 (PS)

3B-CT3A-CT2A-CT2B-CT1A-CT1B-CT




AFTER LBB/BFR(2-52)

SPARE

SPARE

SPARE

2B-CT

MAINPROTECTION

BACKUPPROTECTION

METERING &ENERGY METER



3T-CT

SPARESPAREMETERING &ENERGY METER


TEED PROT-2(BAY 2&3) AFTER LBB/BFR

(3-52)


MAIN-2PROTECTION


AFTER LBB/BFR (1-52)

CORE-4 (PS)



MAIN-1PROTECTION


CORE-5 (PS)

BUSBAR-2 CHECKUPPROTECTION

(SPARE)

SPARETEED PROT-2(BAY 1&2)


(SPARE)

CORE-2 (PS)

BUSBAR-2PROTECTION

SPARETEED PROT-1(BAY 1&2)

BUSBAR-1PROTECTION

CORE-1 (PS)

3-CT2A-CT1L-CT1-CT


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

MAINPROTECTIONSOME TIMES DUPLICATED

BUSBAR PROTECTION WITH DUPLICATE LBB IS REQUIRED

MAIN-1PROTECTION

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

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

CORE-4 (PS)

BUSBAR-2 MAIN-2

PROTECTION

LBB PROT(BAY-3)





LBB PROT(BAY-1)

BUSBAR-1 MAIN-2

PROTECTION

CORE-2 (PS)



BACKUPPROTECTION



MAIN-2PROTECTION

TEEDPROT-1(BAY 1&2)


CORE-3 (PS)



CORE-5 (0.5/0.2)

BUSBAR-2 MAIN-1

PROTECTION

LBB PROT(BAY-3)


LBB PROT(BAY-2)

LBB PROT(BAY-2)


LBB PROT(BAY-1)

BUSBAR-1 MAIN-1

PROTECTION

CORE-1 (PS)

3B-CT3A-CT3T-CT2A-CT2B-CT1L-CT1A-CT1B-CT

CT CORES CONEECTION DIAGRAMS IN


SCHEMEPREPARED BY


SINGLE BUS SYSTEM

1-52CB1-89 1-89L

3

1-CT

P2 P13 33 3

CORES1 2 3 4 5

BU

S B

AR

PR

OTE

CTI

ON

BU

S B

AR

CH

ECK

UP

PR

OT

MET

ERIN

G

MAIN-

2/BA

CKUP

PROT

ECTIO

N

MA

IN-1

PR

OTE

CTI

ON

BUS

1-CVT

3

3

331 2 333

3

3

32

1

BB-EVT/ CVT

ONE & HALF BREAKER ( 3 CT METHOD) WITH PROTECTION SCHEME87BB1

87BB2

CVT

CVT

VBB1

VBB2

79

25

79

25

79

25VBB2

BF

BFVL2 / VL1

OR VBB1

VL1 / VL2

OR VBB2

VBB1

FEEDER1 / LINE1

FEEDER2 / LINE2

87L 21M2

CVT VL2

CVT VL1

BF

VL1

BUSBAR-1

BUSBAR-2

MAIN-1

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

21M1 VL1

VL1 / VBB1

VL2 / VBB2

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


87BB2

CVT

CVT

VBB1

VBB2

79

25

79

25VBB2

BF

BFVL2 / VL1

OR VBB1

VL1 / VL2

OR VBB2

VBB1

FEEDER1 / LINE1

FEEDER2 / LINE2

87L 21M2

CVT VL2

CVT VL1

BF

VL1

BUSBAR-1

BUSBAR-2

MAIN-1

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

21M1 VL1

79

25VL1 / VBB1

VL2 / VBB2



87BB2

CVT

CVT

VBB1

VBB279

25VBB2

BF

BFVL2 / VL1

OR VBB1

79

25VL1 / VL2

OR VBB2

VBB1

FEEDER1 / LINE1

FEEDER2 / LINE2

87L 21M2

CVT VL2

CVT VL1

BF

VL1

BUSBAR-1

BUSBAR-2

MAIN-1

MAIN-2

PROTECTION OF LINE2(OR TRANSFORMER, IF APPLICABLE)

21M1 VL1

79

25VL1 / VBB1

VL2 / VBB2



87BB2

CVT

CVT

VBB1

VBB2

79

25

79

25

79

25VBB2

BF

BFVL2 / VL1

OR VBB1

VL1 / VL2

OR VBB2

VBB1

FEEDER1 / LINE1

FEEDER2 / LINE2

CVT VL2

CVT VL1

BF

87L 21M2 VL1

BUSBAR-1

BUSBAR-2

MAIN-1

MAIN-2


21M1 VL1

VL1 / VBB1

VL2 / VBB2

87 TD1 HZ

87 TD2 LZ

87 TD1 HZ

87 TD2 LZ

.

.



87BB2

CVT

CVT

VBB1

VBB2

79

25

79

25VBB2

BF

BFVL2 / VL1

OR VBB1

VL1 / VL2

OR VBB2

VBB1

FEEDER1 / LINE1

FEEDER2 / LINE2

CVT VL2

CVT VL1

BF

87L 21M2 VL1

BUSBAR-1

BUSBAR-2

MAIN-1

MAIN-2


21M1 VL1

79

25VL1 / VBB1

VL2 / VBB2

87 TD1 HZ

87 TD2 LZ

87 TD1 HZ

87 TD2 LZ

.

.



87BB2

CVT

CVT

VBB1

VBB2

79

25

BF

BF

79

25VBB2

VL2 / VL1

OR VBB1

VL1 / VL2

OR VBB2

VBB1

FEEDER1 / LINE1

FEEDER2 / LINE2

CVT VL2

CVT VL1

BF

87L 21M2 VL1

BUSBAR-1

BUSBAR-2

MAIN-1

MAIN-2


21M1 VL1

79

25VL1 / VBB1

VL2 / VBB2

87 TD1 HZ

87 TD2 LZ

87 TD1 HZ

87 TD2 LZ


ONE & HALF BREAKER ( 6 CT METHOD) WITH PROTECTION SCHEME CVT

CVT

VBB1

VBB2

VL1 / VL2

OR VBB2

VBB1

FEEDER1 / LINE1

FEEDER2 / LINE2

87L 21M2

CVT VL2

CVT VL1VL1

BUSBAR-1

BUSBAR-2

MAIN-1

MAIN-2


21M1 VL1

VL1 / VBB1

VL2 / VBB2


(WITH LATEST CONCEPT)

79

25

BF

79

25

BF

79

25

BF

VL2 / VL1

OR VBB1

VBB2

87B

B87

BB

IN THIS CONCEPT FOR ONE & HALF BREAKER SYSTEMA 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.

BU

S-I

BU

S-II

1-52C

B

2-52C

B

3-52C

B

MAIN-1MAIN-2

MET+SYN

MA

IN-1

MA

IN-2

ME

T+S

YN

MA

IN-1

MA

IN-2

ME

T+S

YN87

BB

M1

BUSB

AR P

ROTN

MAIN

-1

87 B

B M1

BU

SBAR

PRO

TNMA

IN-1

87 B

B M2

BU

SBAR

PRO

TNMA

IN-2

87 B

B M2

BU

SBAR

PRO

TNMA

IN-2

21L1

-LIN

E DI

ST P

ROT1

21L2

-LIN

E DI

ST P

ROT2

87T1

-ICT

DIF

F PR

OT1

67HV

-ICT

DIR

O/C

,E/F

87T2- ICT DIFF PROT2

DISTURBANCE RECORDER,EVENT RECORDER, FAULT LOCATOR

ARE IN BUILT FUNCTIONS IN BOTHNUMERICAL DIST PROT RELAYS

21L1 & 21L2

DISTURBANCE RECORDER,EVENT RECORDER,

ARE IN BUILT FUNCTIONS IN BOTHNUMERICAL DIFF PROT RELAYS

87T1 & 87T2

FOR ICT CVT IS NOT AVAILABLE.ACCORDING TO CONDITION IT IS SELECTED

BUS-1 CVT OR BUS-2 CVT OR LINE CVTHV & LV OVER FLUX PROT ARE IN BUILT.

ICT HV METERING IS BUSHING CT

LATEST CONCEPTREDUNDANT LINE PROTECTIONREDUNDANT ICT PROTECTION

REDUNDANT BUSBAR PROTECTIONLBB IS IN BUILT FUNCTION OF BUSBAR

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

BU

S-I

BU

S-II

1-52C

B

2-52C

B

3-52C

B

MAIN-1MAIN-2

MET+SYN

MA

IN-1

MA

IN-2

ME

T+S

YN

MA

IN-1

MA

IN-2

ME

T+S

YN87

BB

M1

BUSB

AR P

ROTN

MAIN

-1

87 B

B M1

BU

SBAR

PRO

TNMA

IN-1

87 B

B M2

BU

SBAR

PRO

TNMA

IN-2

87 B

B M2

BU

SBAR

PRO

TNMA

IN-2

21L1

-LIN

E DI

ST P

ROT1

21L2

-LIN

E DI

ST P

ROT2

87T1

-ICT

DIF

F PR

OT1

67HV

-ICT

DIR

O/C

,E/F

87T2- ICT DIFF PROT2

DISTURBANCE RECORDER,EVENT RECORDER, FAULT LOCATOR

ARE IN BUILT FUNCTIONS IN BOTHNUMERICAL DIST PROT RELAYS

21L1 & 21L2

DISTURBANCE RECORDER,EVENT RECORDER,

ARE IN BUILT FUNCTIONS IN BOTHNUMERICAL DIFF PROT RELAYS

87T1 & 87T2

FOR ICT CVT IS NOT AVAILABLE.ACCORDING TO CONDITION IT IS SELECTED

BUS-1 CVT OR BUS-2 CVT OR LINE CVTHV & LV OVER FLUX PROT ARE IN BUILT

LATEST CONCEPTREDUNDANT LINE PROTECTIONREDUNDANT ICT PROTECTION

REDUNDANT BUSBAR PROTECTIONLBB IS IN BUILT FUNCTION OF BUSBAR

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

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

BU/PU

BU/PU

BU/PU

OR

OR

(REB 500) ABB

(7 SS 52) SIEMENS

(MICOM P740) AREVA

OR

DECENTRALISED CONCEPT CENTRALISED CONCEPT

LBB INBUILT FEATUREBU / PU TO BUSBAR

DIGITAL COMMUNICATION

FO

FO

FO

OR

(REB 670) ABB

(487B) SEL

(MICOM P746) AREVA

LBB INBUILT FEATURE

COMPARISION BETWEEN DIFFERENT CT METHODS

3 CT3 CT3 CT3B CT3 CT3 CT

ABOVE FOR BUS-1 & BELOW FOR BUS-2

1 CT1 CT1 CT1B CT1 CT1 CTBUSBAR & BUSBAR

CHECKUPPROTECTION

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.

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

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

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

1 L - CT1 L - CT1 L - CT1 A – CT & 2 B – CT1 CT & 2 B - CT1 - CT & 2 - CT MAIN-1 MAIN-2

PROTECTION &

METERING

ABOVE FOR FEEDER-1 BELOW FOR FEEDER-2

ABOVE CT SECONDARIES ARE CONNECTED PARALLEL FOR FEEDER-1 BELOW CT SECONDARIES ARE CONNECTED PARALLEL FOR FEEDER-2

3 L – CT3 L - CT3 L - CT3 A - CT & 2 A - CT3 - CT & 2 A - CT3 - CT & 2 – CT

6 CT (T2)METHOD

6 CT (T1)METHOD

5 CTMETHOD

6 CT (S)METHOD

4 CT METHOD

3 CT METHOD

CT PURPOSE

TIE CB BLIND ZONE AREA IS TAKEN CARE

TIE CB BLIND ZONE AREA IS TAKEN CARE

BLIND ZONE FOR MAIN CB & TIE CB

MAIN CB & TIE CB BLIND ZONE AREA IS

TAKEN CARE

TIE CB BLIND ZONE AREA IS TAKEN

CARE.

MINIMUM CT METHOD. REDUCING

THE COST OF CTsADVANTAGES

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.

BLIND ZONE

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.

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.

ADDITIONAL PROTECTIONAVAILABLE

400KV C.T. INFORMATION

33U

3U

3 U31S11S21S3

2S12S22S3

3S13S23S33S4

5S15S25S35S44S14S24S34S4

P1 P2

P1 P2

31S11S21S3

32S12S22S3 3 U

3S13S23S33S4

3U 5S15S

25S

35S

4

3U 4S14S24S34S4

EYE BOLT DESIGN

HAIRPIN /

U SHAPE DESIGN

DEAD TANK DESIGN

__1S1 – 1S21S2 – 1S31S1 – 1S3BUSBAR

PROTECTIONPSCORE-1

__2S1 – 2S22S2 – 2S32S1 – 2S3

BUSBAR CHECKUP

PROTECTIONPSCORE-2

3S1 – 3S23S4 – 3S3

3S1 – 3S33S4 – 3S23S1 – 3S4METERING0.5 / 0.2CORE-3

4S1 – 4S24S4 – 4S3

4S1 – 4S34S4 – 4S24S1 – 4S4MAIN-2

PROTECTIONPSCORE-4

5S1 – 5S25S4 – 5S3

5S1 – 5S35S4 – 5S25S1 – 5S4MAIN-1

PROTECTIONPSCORE-5

500/ 1A1000/ 1A2000/ 1A

SECONDARY CONNECTIONSCURRENT RATING : 1APURPOSECLASSCORES

PRIMARY CONNECTIONS : P1 – P2CURRENT RATING : 2000 AMPS

MAIN-1, MAIN-2PROTECTION &

METERINGFOR LINE

ADOPTED IN ONE AND HALF

CIRCUIT BREAKER SCHEME PREPARED BY


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

NUMERICAL DISTANCE SCHEME (21) OR LINE DIFFERENTIAL SCHEME (87L) WITH 67N

NUMERICAL DISTANCE SCHEME (21P + 21N) + in BUILT DEF RELAY(67N)765 KV LINES7.

NUMERICAL DISTANCE SCHEME (21) OR LINE DIFFERENTIAL SCHEME (87L) WITH 67N

NUMERICAL DISTANCE SCHEME (21P + 21N) + in BUILT DEF RELAY(67N)400 KV LINES6.

SWITCHED DISTANCE SCHEME ORNUMERICAL DISTANCE SCHEME (21P+ 21N)

NON SWITCHED DISTANCE SCHEME ORNUMERICAL DISTANCE SCHEME (21P + 21N)220 KV LINES5.

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 LINEZONE-2: 100% OF MAIN LINE + 50% OF SHORTEST LINE AT OTHER ENDZONE-3: 100% OF MAIN LINE + 100% OF SHORTEST LINE AT OTHER ENDZONE-4: 100% OF MAIN LINE + (100% OF SHORTEST LINE + 20% OF LONGEST LINE) AT OTHER END.

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

SWITCHED DISTANCE SCHEME ORNUMERICAL DISTANCE SCHEME (21P+ 21N)132 KV LINES4.

66 KV LINES3.-3 O/L + E/F ( 51 + 51N )33 KV LINES2.-2 O/L + E/F ( 51 + 51N )11 KV LINES1.

MAIN-2 PROTECTION/ BACKUP PROTECTIONMAIN- 1 PROTECTIONVOLTAGE Sr.No

MAIN-1 PROTECTION FOR LINE (21L1)(4CT METHOD)

3 3 3

3 3 3

IR5 / A511IY5 / A531IB5 / A551

IN5 / A571

1-CT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

2-BCT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S25S2 5S2

P2P2P2 CT MB

CT MB

P2P2P2

5S4 5S4 5S4

5S25S2 5S2

VR11 / E111VY11 / E131VB11 / E151VN11 / E171

1-CVT

CORE – 1

200VA

CLASS: 3P

3 C

T M

ETH

OD

: 1-

CT

& 2

-CT

4 C

T M

ETH

OD

: 1-

CT

& 2

-BC

T6

CT

MET

HO

D :

1-A

CT

& 2

-BC

T

MAIN-1 PROTECTION FOR LINE (21L1)(4CT METHOD) (NEW DEVELOPMENT)

3 3 3

3 3 3IR5 / A511IY5 / A531IB5 / A551

IN5 / A571

1-CT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

2-BCT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S25S2 5S2

P2P2P2 CT MB

CT MB

P2P2P2

5S4 5S4 5S4

5S25S2 5S2

VR11 / E111VY11 / E131VB11 / E151VN11 / E171

1-CVT

CORE – 1

200VA

CLASS: 3P

IA =250.10 AIB =250.10 A IC =250.10 AVAB =400.0 KVVBC =400.0 KVVCA =400.0 KV

ESC ENT

ENABLEDTRIP TARGET

RESET

INSTTIMECOMMSOTFZONE1ZONE2ZONE3ZONE4

PH-APH-BPH-CGND

505179 RESET79 LOCKOUT

SEL- 421PROTECTIONAUTOMATIONCONTROL

SELIR5 / A511IY5 / A531IB5 / A551

IN5 / A571

3 C

T M

ETH

OD

: 1-

CT

& 2

-CT

4 C

T M

ETH

OD

: 1-

CT

& 2

-BC

T6

CT

MET

HO

D :

1-A

CT

& 2

-BC

T


3 3 3

IR5 / A511IY5 / A531IB5 / A551

IN5 / A571

1-LCT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S25S2 5S2

P2P2P2 CT MBVR11 / E111VY11 / E131VB11 / E151VN11 / E171

1-CVT

CORE – 1

200VA

CLASS: 3P

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

3 3 3

3 3 3IR4 / C411IY4 / C431IB4 / C451

IN4 / C471

1-CT

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

CLASS: PS

2-BCT

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

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2

P2P2P2 CT MB

CT MB

P2P2P2

4S4 4S4 4S4

4S24S2 4S2

VR21 / E211VY21 / E231VB21 / E251VN21 / E271

1-CVT

CORE – 2

200VA

CLASS: 3P

50ZTLBB/BFR

50ZLBB/BFR

3 C

T M

ETH

OD

: 1-

CT

& 2

-CT

4 C

T M

ETH

OD

: 1-

CT

& 2

-BC

T6

CT

MET

HO

D :

1-A

CT

& 2

-BC

T

21 L2

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

3 3 3

3 3 3IR4 / C411IY4 / C431IB4 / C451

IN4 / C471

1-CT

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

CLASS: PS

2-BCT

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

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2

P2P2P2 CT MB

CT MB

P2P2P2

4S4 4S4 4S4

4S24S2 4S2

VR21 / E211VY21 / E231VB21 / E251VN21 / E271

1-CVT

CORE – 2

200VA

CLASS: 3P

IR4 / C411IY4 / C431IB4 / C451

IN4 / C471

3 C

T M

ETH

OD

: 1-

CT

& 2

-CT

4 C

T M

ETH

OD

: 1-

CT

& 2

-BC

T6

CT

MET

HO

D :

1-A

CT

& 2

-BC

T

MULTI FUNCTION NUMERICAL RELAY FOR MULTI BREAKER, MULTI CT & CVT/PT APPLICATION

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

1-52 CB 2-52 CB 3-52 CB3 3

LINE

1-52,2-52: MAIN & TIE CIRCUIT BREAKER21P: PHASE DISTANCE PROTECTION21N: GROUND DISTANCE PROTECTION27: UNDER VOLTAGE RELAY67: DIRECTIONAL RELAY50: INST OVER CURRENT RELAY51: TIME OVER CURRENT RELAY59: OVER VOLTAGE RELAY64: EARTH FAULT RELAY50BF-1: LBB/BFR OF MAIN CB50BF-2: LBB/BFR OF TIE CB79-1,2: AUTO RECLOSURE RELAY OF

MAIN & TIE CB25-1,2: CHECK SYNCHRONISAM RELAYFOR MAIN & TIE CB

67P

50 BF-1 50 BF-2

21N

79-1

21P 50P 51P27

59

33

3

33

3

BUS-1 PT BUS-2 PT

LINE CVT

25-179-2 25-2

67N50N 51N


3 3 3

IR4 / C411IY4 / C431IB4 / C451

IN4 / C471

1-LCT

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

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2


1-CVT

CORE – 2

200VA

CLASS: 3P

MULTI FUNCTION PANEL METERING & ENERGY METER(4CT METHOD)

3 3 3

3 3 3IR3 / D311IY3 / D331IB3 / D351

IN3 / D371

1-CT

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

CLASS: 0.5

2-BCT

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

CLASS: 0.5

3S4 3S4 3S4

3S23S2 3S2

P2P2P2 CT MB

CT MB

3S4 3S4 3S4

3S23S2 3S2

VR31 / E311VY31 / E331VB31 / E351

VN31 / E371

1-CVT

CORE – 3

100VA

CLASS: 0.5/0.2P2P2P2

3 C

T M

ETH

OD

: 1-

CT

& 2

-CT

4 C

T M

ETH

OD

: 1-

CT

& 2

-BC

T6

CT

MET

HO

D :

1-A

CT

& 2

-BC

T

3 3 3

IR3 / D311IY3 / D331IB3 / D351

IN3 / D371

1-LCT

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

CLASS: 0.5/0.2

3S4 3S4 3S4

3S23S2 3S2

P2P2P2 CT MB

VR31 / E311VY31 / E331VB31 / E351

VN31 / E371

1-CVT

CORE – 3

100VA

CLASS: 0.5/0.2

MULTI FUNCTION PANEL METERING & ENERGY METER(5CT METHOD)

LBB & BUSBARPROTECTION

SCHEMES ADOPTED IN

ONE AND HALFCIRCUIT BREAKER

SCHEMEPREPARED BY


BASICS OF LBB/BFR PROTECTIONLOCAL 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 BACK-UP 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-UPLOCAL BACK-UP PROTECTION CAN BE DEVIDED INTO TWO CATAGORIES.RELAY BACK-UPBREAKER BACK-UP

RELAY BACK-UPDUPLICATE 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.eELECTROMECHANICAL, 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-UPBECAUSE 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 PROTECTIONOPERATED

YES

YES

TRIP MAIN

BREAKER

INITIATEBFR

WAIT FOR FAULT

CLEARENCEAND

FAULT CLEARED

YES

NO

RESETBREAKER FAILURE SCHEME

TRIPBACK-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.

RETRIP

LBB/BFR TIME CO-ORDINATION CHARTFAULT OCCURS

NORMAL CLEARING

INOPERATIVEBREAKER

BREAKER INTURUPTING TIME

PROTECTIVE RELAYFOR EX: DISTANCE RELAY

NORMAL CLEARING TIME

BREAKER FAILURE RELAY START

MARGIN

RESETTING TIME OF THE CURRENT MEASURING UNITS

SET TIME OF THE TIME MEASURING UNIT TRIPPING RELAYTIME

BACK-UP BREAKERINTERUPTING TIME

TOTAL CLEARING TIME OF THE BREAKER FAILURE RELAY

MARGIN

MAXIMUM FAULT CLEARING TIME BEFORE SYSTEM INSTABILITY

~30ms ~60ms <12ms

LBB/BFR LOGICPHASE L1

PHASE L2/E

PHASE L3

CURRENT INPUTS

~

|||

A/DCONVERTER

&I > ISET

I > ISET

PHASE CURRENT SET POINT

EARTH CURRENT SET POINT

&

CIRCUIT BREAKER FAILURE INITIATE

BINARY INPUT

OUT PUT OF DISTANCE RELAY ORSHORT CIRCUIT CURRENT RELAY

> 1

TIMING/OUTPUT STAGE

0 1

0 1

TIME STAGE T1

TIME STAGE T2

TIME STAGE T2SWITCHED OFF

&

&

&

O

> 1

LEDCB FAILURE

INITIATE

LED

TRIP T2RELAY

ALARM T1 RELAY

LED

TRIP T1 RELAY

LED(PHASE START)

LED(EARTH START)

ALARM RELAY(PHASE START)

ALARM RELAY(EARTH START)

LBB/BFR PROTECTION

1-52CB 2-52CB 3-52CBBUS-1 BUS-2

LINE1 AT/F-1

50Z 50ZLBB/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.

50ZT

1-52 CB LBB/BFR OPERATION

BUS-1 BUS-2

1-52CB 3-52CB2-52CB

86-A

86-B

ABBREL521MAIN-1

ABBREL316MAIN-2

86-A

86-B

TC-1 TC-2

BUSBAR-1 PROTECTION OPTD

AND BUSBAR-1 ISOLATED

DIRECT TRIP 1&2VIA CARRIER TO

OTHER END

TC-1TC-2

50Z

TO 86-B TRIP RELAYOF TIE CB(2-52CB)

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


BUS-1 BUS-2

1-52CB 3-52CB2-52CB

ABBREL521MAIN-1

ABBREL316MAIN-2

86-A

86-B

TC-1 TC-2

ABBRET521MAIN-1

ABBRET316MAIN-2

TO 86-B TRIP RELAYOF LINE CB(1-52CB)

DIRECT TRIP 1&2VIA CARRIER

TO OTHER END

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

INTER TRIP TOLVCB & TBCCB

50ZT

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)


BUS-1 BUS-2

1-52CB 3-52CB2-52CB

86-A

86-B

ABBRET521MAIN-1

ABBRET316MAIN-2

86-A

86-B

TC-1 TC-2 TC-1TC-2

BUSBAR-2PROTECTION OPTD

AND BUSBAR-2 ISOLATED

INTER TRIP TO LV CB & TBC CB

50Z

TO 86-B TRIP RELAYOF TIE CB(2-52CB)

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 PROTECTIONNEED FOR BUSBAR PROTECTION

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

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

BASIC THEORYKIRCHOFF’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 SYSTEMS1. HIGH IMPEDENCE DIFFERENTIAL PROTECTION 2. MODERATE-IMPEDENCE DIFFERENTIAL PROTECTION3. LOW-IMPEDENCE DIFFERENTIAL PROTECTION4. NUMERICAL BUS DIFFERENTIAL PROTECTIONHIGH 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 RELAYPUTS STRINGENT REQUIREMENTS ON CT’s. Class X for all CT Cores.NEED FOR DEDICATED CT CORES. Separate CT Cores for BUSBAR and CHECK ZONE Protection.IDENTICAL CT RATIO, MAGNETISING IMPEDENCE.AUX CT’s RATIO CORRECTIONS UNACCEPTABLE.IN ABILITY TO COPE WITH INCREASING FAULT CURRENT.SLOW RESPONSE.Advantage of Numerical Protection Technology (e.g. Fault recording, Communication etc) not available.BASIC OPERATING TIME EXCLUDING RELAY TIME IS 15 – 20ms.THIS RELAY REQUIRES CHECK ZONE FEATURE. THE TRIP COMMAND IS ONLY GIVEN WHEN BOTH A DISCRIMINATING & CHECK ZONE SYSTEM OPERATES.MEDIUM IMPEDENCE DIFFERENTIAL PROTECTION

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

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

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

BASICS OF BUS BAR PROTECTIONBASIC THEORY

EXTERNAL FAULT

KIRCHOFF’s CURENT LAW STATES THAT THE SUM OF THE CURRENTS ENTERING A GIVEN NODE MUST BE EQUAL TO THE CURRENTS LEAVING THAT NODE

I6

I4

I2

I5

I3

I1

IF

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

INTERNAL FAULT

I6

I4

I2

I5

I3

I1IF

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

HIGH IMPEDENCE BUSBAR PROTECTION

UU

UU

UU

UU

UU

UUUU

UU

UU

UU

UU

UU87BBM

87BBC

52 CIRCUIT BREAKERTRIP COIL

+ VE

- VE

96 BBC : BUSBAR CHECK TRIPPING RELAY

96 BBM : BUSBAR MAIN TRIPPING RELAY

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

LOW IMPEDENCE BUSBAR PROTECTION

UU

UU

UU

UU

UU

UU

52 C

IRC

UIT

B

REA

KER

TRIP

CO

IL-VE

+VE

OVE

R C

UR

REN

TC

OIL

RESTRAINTCOIL

OPE

RA

TIN

GC

OIL

96 BUS BARTRIPPING

RELAY

OV

ER

CU

RR

EN

T

STA

RT

ER

RE

LA

YS.

Id

Is

DIFFERENCE BETWEEN BUSBAR SCHEMES

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

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

STABLE FOR INFINITE FAULT LEVEL.INABILITY TO COPE WITH INCREASING FAULT CURRENT.STABILITY

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

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

MOST SUITABLE FOR DOUBLE AND MULTIPLE BUSBAR SYSTEMS ( WITH OR WITHOUT TRANSFER BUS).

IT IS GOOD SOLUTION FOR SINGLE BUSBAR ARRANGEMENTS, ONE & HALF BREAKER SYSTEMS OR RING BUSBAR SYSTEMS.UTILISATION

THIS RELAY HAS IN BUILT CHECK ZONE FEATURE (NO SEPARATE CHECKZONE FEATURE) i.e OVER CURRENT STARTING RELAY PROVIDED.

THIS RELAY REQUIRES CHECK ZONE FEATURE. THE TRIP COMMAND IS ONLY GIVEN WHEN BOTH A DISCRIMINATING & CHECK ZONE SYSTEM OPERATES.

ADDITIONAL PROTECTION

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

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

IMPOSES LESS BURDEN ON CTs. AUXILIARY CTs HAVE NO EFFECT ON PERFORMANCE OF SCHEME.

IMPOSES COMPARATIVELY HIGH BURDEN ON CTs. AUXILIARY CTs REDUCE THE PERFORMANCE OF THE SCHEMEBURDEN

IT CAN WORK WITH CTs OF UNEQUAL RATIOS ALSO. FREE OF ANY NEED OF MATCHED CT CHARACTERESTIC OR RATIOs LOW LEAKAGE REACTANCE OR RESISTANCE. OTHER PROTECTIVE RELAYS CAN BE INCLUDED IN THE SAME CIRCUIT.

IT REQUIRES ALL IDENTICAL CT RATIO’s & TURNS RATIO. LOW RESISTANCE OF SECONDARY WINDING. Class X for all CT Cores. MINIMUM KNEE POINT VOLTAGE OF 300-500V. LOW MAGNETISING CURRENT(FEW MILLIAMPS).

CTs

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.

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.

PRINCIPLE

PERCENTAGE BIASED LOW IMPEDENCE BUS BAR PROTECTIONHIGH IMPEDENCE BUSBAR PROTECTIONDETAILS

BUS BAR MAIN & CHECHUP PROTECTION(ANY CT METHOD)

3 3 3

3 3 3

IR1 / B111IY1 / B131IB1 / B151

IN1 / B1711-CT

CORE-1CTR: 2000-1000/1A

CLASS: PS

3-CT

CORE-1CTR: 2000-1000/1A

CLASS: PS

1S3 1S3 1S3

1S11S1 1S1

P2P2P2 CT MB

CT MB

P2P2P2

1S3 1S3 1S3

1S11S1 1S1

BUS BAR PROTECTION

FOR BUS-1

BUS BAR PROTECTION

FOR BUS-2

IR1 / B111IY1 / B131IB1 / B151

IN1 / B171

DUPLICATE BUS BAR PROTECTION(NEW DEVELOPMENT)

3 3 3

3 3 3

IR1 / B111IY1 / B131IB1 / B151

IN1 / B1711-CT

CORE-1CTR: 2000-1000/1A

CLASS: PS

3-CT

CORE-1CTR: 2000-1000/1A

CLASS: PS

1S3 1S3 1S3

1S11S1 1S1

P2P2P2 CT MB

CT MB

P2P2P2

1S3 1S3 1S3

1S11S1 1S1

BUS BAR PROTECTION

FOR BUS-1

BUS BAR PROTECTION

FOR BUS-2

IR1 / B111IY1 / B131IB1 / B151

IN1 / B171

MAINCB LBB IS PART OF BUSBAR

PROTECTION

50Z

50Z

LBB

LBB

BUS BAR PROTECTION87 – BB1 BUS BAR-1 PROTECTION

87 – BB2 BUS BAR-2 PROTECTIONBUS-2

BUS-1

1-52

UUUU

2-52

3-52

1-C

T3-

CT

4-52

U UUU

5-52

6-52

4-C

T6-

CT

7-52

U UUU

8-52

9-52

7-C

T9-

CT

10-5

2UU

U U11

-52

12-5

210

-CT

12-C

T

13-5

2U U

UU14

-52

15-5

213

-CT

15-C

T

16-5

2U U

UU17

-52

18-5

216

-CT

18-C

T

19-5

2U U

UU20

-52

21-5

219

-CT

21-C

T

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

MAIN CB LBB

MAIN CB LBB

TIE CB LBB

OR

OR

(REB 500) ABB

(7 SS 52) SIEMENS

(MICOM P740) AREVA

OR

DECENTRALISED CONCEPT CENTRALISED CONCEPT

LBB INBUILT FEATURELBB TO BUSBAR

DIGITAL COMMUNICATION

FO

FO

FO

OR

LBB INBUILT FEATURE

(REB 670) ABB

(487B) SEL

(MICOM P746) AREVA

OR

OR

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

MAIN CB LBB

MAIN CB LBB

TIE CB LBB

OR

OR

(REB 500) ABB

(7 SS 52) SIEMENS

(MICOM P740) AREVA

DECENTRALISED CONCEPT

LBB TO BUSBARDIGITAL COMMUNICATION

FO

FO

FO

OR

OR

(REB 500) ABB

(7 SS 52) SIEMENS

(MICOM P740) AREVA

DECENTRALISED CONCEPT

LBB TO BUSBARDIGITAL COMMUNICATION

MAIN CB LBB

MAIN CB LBB

TIE CB LBB

FO

FO

FO

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

CENTRALISED CONCEPT

LBB INBUILT FEATURE

CENTRALISED CONCEPT

LBB INBUILT FEATURE

(REB 670) ABB

(487B) SEL

(MICOM P746) AREVA

OR

OR

(REB 670) ABB

(487B) SEL

(MICOM P746) AREVA

OR

OR

BUSBAR-1 PROTECTION TRIPPING SCHEMEHIGH SPEEDTRIP RELAY

FOR 1-52 CB

TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER

1-52 CB PANEL


4-52 CB PANEL


7-52 CB PANEL


10-52CB PANEL


13-52 CB PANEL


16-52 CB PANEL

HIGH SPEEDTRIP RELAY

FOR 4-52 CB


FOR 7-52 CB


FOR 10-52 CB


FOR 13-52 CB


FOR 16-52 CB

1-52 CB PANELTRIP FROM 50 LBB

TO START 50 LBB


TO START 50 LBB


TO START 50 LBB


TO START 50 LBB


TO START 50 LBB


TO START 50 LBB

+VE BUSBAR PANEL

BUSBAR-2 PROTECTION TRIPPING SCHEMEHIGH SPEEDTRIP RELAY

FOR 3-52 CB


3-52 CB PANEL


6-52 CB PANEL


9-52 CB PANEL


12-52CB PANEL


15-52 CB PANEL


18-52 CB PANEL


FOR 6-52 CB


FOR 9-52 CB


FOR 12-52 CB


FOR 15-52 CB


FOR 18-52 CB


TO START 50 LBB


TO START 50 LBB


TO START 50 LBB


TO START 50 LBB


TO START 50 LBB


TO START 50 LBB

+VE BUSBAR PANEL

DISTRIBUTED LBB & NUMERICAL CENTRALISED BUS BAR PROTECTION

BUS-2

BUS-1

1-52

2-52

3-52

4-52

5-52

6-52

7-52

8-52

9-52

10-5

211

-52

12-5

2

13-5

214

-52

15-5

2

OR OR

(REB 500) ABB (7 SS 52) SIEMENS (MICOM P740) AREVA

OR OR

LATEST DEVELOPMENT IN NUMERICAL CENTRALISED BUS BAR PROTECTION

1. IN THIS NO SEPARATE CORE IS REQUIRED FOR EITHER BUSBAR PROTECTION OR LBB / BFR. 2. CENTRALISED BUSBAR IS CONNECTED FROM BAY UNIT OR LBB OR BFR THROUGH FIBRE OPTIC.3. 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.4. 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.

DESCRIPTION

TRANSFORMER PROTECTION

LINE PROTECTION

BAY UNIT

BUSBAR PROTECTION

CENTRAL UNIT

AREVASIEMENSABB

C

E

ABB Network Partner AG REL531

C

E

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910111213141516

ABB Network Partner AG REC 316*4

21 L1 21 L2 21 L1 21 L2 21 L1 21 L2

C

E


C

E

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910111213141516


87 T1 87 T2 87 T1 87 T2 87 T1 87 T2

MISCELENEOUSRELAYS & PROTECTIONS

ADOPTED FOR LINE INONE AND HALF

CIRCUIT BREAKERSCHEME

(STUB, TEED AND AUTO RECLOSURE FUNCTIONS) PREPARED BY


STUB-1/ STUB-2 PROTECTION1-52CB 2-52CB 3-52CBBUS-1 BUS-23 3 33

LINE-1 AT/F-1

STUB-1&2(BAY 1&2)

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.

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)

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)

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

1-89L

REL 521

REL 316

DISTANCE / ATF RELAYS

CONVERTED TO STUB/BUS OVER LOAD

RELAYS WHEN LINE ISOLATOR

OPENS

3-89T

RET 521

RET 316

STUB-3&2(BAY 3&2)

TEED-1/ TEED-2 PROTECTION1-52CB 2-52CB 3-52CBBUS-1 BUS-2

3

3 3

3

3

LINE-1 AT/F-1

TEED-1&2(BAY 1&2)

TEED-1&2(BAY 2&3)

TEED PROTECTION IS BASED ON KIRCHOFF’S CURRENT LAW. THREE SETS OF CTSARE 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-2PROTECTION

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.

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-1PROTECTION

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

3 3 3

3 3 31-CT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

1-LCT

CORE-1CTR: 2000-1000/1A

CLASS: PS

P2P2P2

P1P1P1

3 3 32-CT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

P1P1P1P2P2P2

P1P1P1

P2P2P2

5S4 5S4 5S4

5S25S2 5S2

5S4 5S4 5S4

5S25S2 5S2

1S3 1S3 1S3

1S21S2 1S2

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 USED3-CT(CORE-5), 2-CT(CORE-1) & 3-TCT(CORE-1) ARE STARRED AND CONNECTED TO TEED-1 PROTECTION

IR5IY5IB5

IN5

IR5IY5IB5

IN5

IR1IY1IB1

IN1

87 TEED-1

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

3 3 3

3 3 3

1-CT

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

CLASS: PS

1-LCT

CORE-2CTR: 2000-1000/1A

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2

P2P2P2 CT MB

CT MBP2P2P2

2S2 2S2 2S2

2S32S3 2S3

3 3 3

2-CT

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

CLASS: PS

4S2 4S2 4S2

4S44S4 4S4

P2P2P2CT MB

RA

ICA

LBB

/BFR

RA

ICA

LBB

/BFR

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

87 TEED-2

TEED / STUB PROTECTION TRIP SCHEME

BUS-1 BUS-2

1-52CB 3-52CB2-52CB

86-AMTR/HSTR

ABBREL521MAIN-1

86-BMTR/HSTR

86-BMTR/HSTR

86-AMTR/HSTR

86-BMTR/HSTR

86-AMTR/HSTR

TRIP COIL-1 TRIP COIL-1 TRIP COIL-1


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

(BAY 1&2)

(BAY 2&3)

(BAY 2&3)

(BAY 1&2)

STUBOR

TEED-1

TEED-2OR

STUB

LINE/TRANSFORMER ISOLATOR OPENS THIS INTERLOCK WILL INITIATE 21 L1 / 87 T1 & 21 L2 / 87 T2 CONVERTED STUB-1 & 2 PROTECTION

C

E

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STUBOR

TEED-1

TEED-2OR

STUB

AUTO RECLOSURE BASICSFAULTS ARE THREE TYPES

1. TRANSIENT FAULT: These are cleared by the immediate tripping of Circuit Breakers and do not reoccur when the line is re-energized.2. SEMI-PERMANENT FAULTS: These require a time interval to disappear before a line is charged again.3. PERMANENT FAULTS: These are to be located and repaired before the line is re-energized.

About 80-90% of the faults occurring are transient in nature. Hence the Automatic Reclosure of breaker (after tripping on Fault) will result in the line being successfully re-energized.

ADVANTAGES:A. Decreasing outage time.B. Improving Reliability.C. Improving system stability.D. Reduce fault damage and Maintenance Time.

DEAD TIME: The time between the Auto-reclosing Scheme being energized and the operation of the contacts which energize the Circuit Breaker closing circuit.

RECLAIM TIME: The Time Following a successful closing operation measured from the instant the Auto-Reclosing relay closing contacts make which must elapse before the Auto-Reclosing relay initiates another reclosing attempt. In other words, it may be said to be the time between 1st and 2nd

Auto-Reclosure.

TYPES OF AUTO-RECLOSING SCHEMES:1. BASED ON PHASE

A. THREE PHASE AUTO-RECLOSING: This type of Auto-Reclosing causes an immediate drift part of the two systems and hence no interchange of synchronizing power can take place during the dead time. B. SINGLE PHASE AUTO-RECLOSING: In this, only the faulty phase(only SLG Faults) is reclosed without causing interruption in interchange synchronizing power between two systems through other two healthy phases.

2. BASED ON ATTEMPTS OF RECLOSUREA. 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 inter-connected systems where the loss of a single line is unlikely to cause two sections of the system to drift apart and loose synchronism.

METHOD OF ADOPTION IN ONE AND HALF BREAKER SYSTEM: The Auto-Reclosure Functions used for the Bus Breakers 1-52CB & 3-52CB are set as Masters and one for the Center Breaker 2-52CB(TIE) as Follower. Co-ordination is required between the Auto-Reclosure Functions. A Synchrocheck function is also loaded in each Relay to permit 3 pole Auto-Reclosing.Each Line Protection relays starts both MAIN & TIE Circuit Breakers to trip for the Concerned line. After a Successful reclosure of the Main Breaker, The Tie Breaker will be reclosed after a supplementary time delay. Should the Main CB Auto-Reclosure relay not be successful in its reclosing attempts, the Tie CB Auto-Reclosure is blocked. If the Main CB is Open or its Auto-Reclosure Relay is not ready or Out of service, The TIE CB Auto-Reclosure will reclose The TIE Breaker after its own dead time without any supplementary time delay.

CHOICES OF EHV SYSTEM:1. CHOICE OF DEAD TIME: A. Lower limit is decided by deionising of Circuit Breaker.B. Upper Limit is decided by Transient Stability and Synchronism.C. Longer Transmission Lines Require Longer dead Time.D. The dead time for High Speed Auto-Reclosing scheme with EHV System is 0.3 to 1.2 sec.2. CHOICE OF RECLAIM TIME:This should not be set to such a low value that the operating cycle of Breaker is exceeded when two faults incident occurs close together. The reclaim time will be in the range of 10 to 30 sec., depending the breaker opening and closing mechanisms.3. CHOICE OF ZONE:This should normally kept in Zone-1. It is a Zone-1 fault and SLG fault only auto-reclosure is comes in to picture. In other zones the auto reclosure is blocked.

AUTO-RECLOSURE FOR ONE & HALF BREAKER SCHEME

1-52CB 2-52CB 3-52CB

LINE-1 LINE-2

79 (A/R)+25(SYNC) RAAAMRASC



TRIP COMMANDSAUTO RECLOSURE

COMMANDS

C

E


21 MAIN-1REL 521

C

E

12345678

910111213141516


21 MAIN-2REL 316

C

E


21 MAIN-1REL 521

C

E

12345678

910111213141516


21 MAIN-2REL 316

AUTO RECLOSING TIMING CHART

TIME

AUTO RECLOSERELAY

INSTANT OF FAULT

PROTECTION

CIRCUIT BREAKERTR

AN

SIEN

T F

AU

LTPE

RM

AN

ENT

FAU

LT

PROTECTION

CIRCUIT BREAKER

OPERATING TIME

OPERATING TIME

OPERATES

OPERATES

TRIP COILENERGISED

CONTACTSSEPARATE

ARCEXTINGUISHED

CONTACTS FULLY OPEN

RESETS

TRIP COILENERGISED

CONTACTSSEPARATE

ARCEXTINGUISHED

CONTACTS FULLY OPEN

RESETS

OPENING TIME

ARCING TIME

OPERATING TIME

OPENING TIME

ARCING TIME

OPERATING TIME

CLOSING COILENERGISED

CONTACTS MAKE

CONTACTSFULLY CLOSED

CLOSINGTIME

DEAD TIME

CLOSING COILENERGISED

CONTACTS MAKE

CONTACTSFULLY CLOSED

CLOSINGTIME

DEAD TIME

RECLOSE ON TO FAULT

OPERATES

TRIP COILENERGISED

CONTACTSSEPARATE

ARCEXTINGUISHED

CONTACTS FULLY OPEN

RESETS

SYSTEM DISTURBANCE TIMERECLOSE INITIATED

BY PROTECTION

DEAD TIME CLOSING PULSE TIMERECLAIM TIME

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

CARRIER INTERTRIPPING

SCHEMESADOPTED IN


SCHEME PREPARED BY


TYPES OF CARRIER TRIPPING SCHEMESPERMISSIVE 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 signalmust 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 SCHEMEBlocking 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 SCHEMESConventional 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.

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 SCHEMEIV. PERMISSIVE UNDER REACH ACCELERATED SCHEMEV. PERMISSIVE OVER REACH TRANSFER TRIP SCHEME (POTT)VI. WEEK IN FEED CONDITIONS.

3. BLOCKING OVER REACHING SCHEMESI. BLOCKING OVER-REACHING PROTECTION SCHEME USING ZONE 2.

OR DIRECTIONAL COMPARISION BLOCKING SCHEMEII. BLOCKING OVER-REACHING PROTECTION SCHEME USING ZONE 1.

III. WEEK IN FEED CONDITIONS.4. DIRECTIONAL COMPARISON UNBLOCKING SCHEME

TYPES OF CARRIER TRIPPING SCHEMES

SECURE & DEPENDABLE

DISTANCE & DIRECTION

- - -ZONE-1DIRECT TRIP

SECURE & FASTZONE-2- - -ZONE-1

ACCELERATED UNDER

REACH

SECURE & FASTZONE-2- - -

PERMISSIVE OVER

REACH (POTT)

SECURE & FAST

UNDER IMPEDENCEUNDER VOLTAGEOVER CURRENT

DISTANE &DIRECTION

- - -ZONE-1

PERMISSIVE UNDER REACH (PUTT)

REVERSE LOCKING

OVER REACHING SENDING

DISTANCE & DIRECTION

PERMISSIVE CRITERIA

RECEIVING

FAST & DEPENDABLE- - -

BLOCKING OVER

REACH

GENERAL REQUIREMENTS

UNDER REACHING SENDING

OPERATING MODE

PROPERTIES OF COMMAND PROTECTION SYSTEMS

Same as POTTAll line types –Preferred practice in the USA.

1. Excellent coverage On short lines in the Presence of fault resistance.2. Suitable for the Protection of multi-terminal lines withintermediate in-feed.

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

CharacteristicOf line

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

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)

Dependable and secure communication channel1. 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

SignalTransmission

System

UNBLOCKINGBLOCKING POTTPUTTPARAMETERS

PREFFERED APPLICATIONS OF TELE/ CARRIER TRIPPING SCHEMES

COMPARISION OF TELE/ CARRIER TRIPPING SCHEMES

Special features requiredSpecial features requiredWeak In feed/Open CBModern digital or numerical distance relays are provided with a choice ofseveral 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.

goodPoorLoss of communicationsSpecial features requiredSpecial features requiredCurrent reversal

Security against mal-operation due to:YesYesSuitable for auto Re CloseAs fastSlowerSpeed with in-service testingNot as FastFastSpeed of operation

Blocking schemeTransfer Tripping SchemeCriterion

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.

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

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 zone4. Weak in feed terminals are no problem. (Echo and Weak In feed logic is included)

POTT

Same as POTT1. Slow tripping – all Tele-protection trips must be delayed to wait for the eventual blocking signal.2. Continuous channel Monitoring is not Possible.

Same as POTT

BLOCKING

Same as POTT

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

DRAWBACKS

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

1. Simple technique2. No coordination Of zones and times With the opposite End required.3.The combination Of different relay Types therefore presents no Problems.

ADVANTAGESUNBLOCKINGPUTT PARAMETERS

ADVANTAGES & DRAWBACKS OF TELE/ CARRIER TRIPPING SCHEMES

Suitable Same as PUTT.

Suitable as the Signal can be Transmitted under all Conditions.

Suitable same as PUTT.

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

Frequency or Phase

Modulated Power Line

Carrier

Suitable Same as POTT.

Partially Suitableas the Reverse Fault is also Detected at the Weak In-feed end but no trip at Weak In-feed end.

Suitable as the Strong end detects all the Line Faults with the Over-Reaching Z1B. The Weak In-feed end then echos the received Signal.

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

Weak In-feed

Not Suitable Same as PUTT.

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

Not Suitable same as PUTT.

Not Suitable as the Signal must be Trans-mitted through the Fault Location which Attenuates the Signal.

Amplitude Modulated Power Line

Carrier

Suitable.

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.

POTT

Suitable.

Suitable as Reverse Reach Setting is independent of Line Length.

BLOCKING

Suitable.Suitable.Communication independent

of Power Line

Suitable Same as POTT.

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

Short Line

UNBLOCKINGPUTT PARAMETERS

ADVANTAGES & DRAWBACKS OF TELE/ CARRIER TRIPPING SCHEMES

PROTECTION COUPLER PANEL

C

E

DISPLAY

ACTIVE START TRIP

NSD 50/ NSD 70

G4AC TB: V9LC

1-

2+

5-

6+

9-

10+

13-

14+

TXTRIP A(C)

RXTRIPA(C)

TXTRIPB(D)

RXTRIPB(D)

CS

CS

CR

CR

GA4D TB:V9LC

1-

2+

5-

6+

9-

10+

13-

14+

TXTRIP C(A)

RXTRIPC(A)

TXTRIPD(B)

RXTRIPD(B)

CS

CS

CR

CR

G4AA TB: V9LB

ALA

RM

-125

0V D

CA

LAR

M-2

250V

DC

5

6

7

8

PROTECTION COUPLERS FOR 400KV LINEFOR 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.

MAIN-1 PROTECTION CARRIER INTER TRIPPING

LINE 21L1CR

CS

-VECARRIER RECEIVE

CARRIER SEND

ALARM

IN

AB

BN

SD 5

0

OUT

PANEL-1

PANEL-2

G4AC V9LC 1

G4AC V9LC 2

G4AC V9LC 5

G4AC V9LC 6

G4AA V9LB 5

G4AA V9LB 6

AB

BN

SD 5

0 G4AC V9LC 10

G4AC V9LC 14

G4AC V9LC 9

G4AC V9LC 13THIS IS BACKUP FOR PERMISSIVE/ PROTECTION TRIPAND CONNECTED IN ANOTHER PANEL

+VE -VE

MAIN-2 PROTECTION CARRIER INTER TRIPPING

LINE 21L2CR

CS

-VECARRIER RECEIVE

CARRIER SEND

ALARM

IN

AB

BN

SD 5

0

OUT

PANEL-2

PANEL-1

G4AC V9LC 1

G4AC V9LC 2

G4AC V9LC 5

G4AC V9LC 6

G4AA V9LB 5

G4AA V9LB 6

AB

BN

SD 5

0 G4AC V9LC 10

G4AC V9LC 14

G4AC V9LC 9

G4AC V9LC 13THIS IS BACKUP FOR PERMISSIVE/ PROTECTION TRIPAND CONNECTED IN ANOTHER PANEL

+VE -VE

DIRECT TRIP SEND CARRIER CHANNEL-1

T N C

MAIN CB(1-52CB)

T N C

TIE CB(2-52CB)

CONTROL PANEL

87 BUSBAR TRIP (ZONE-1)


96 BUSBAR PROT-1 PANEL


R Y B

R Y B

TIE CB (2-52 CB)

MAIN CB (1-52 CB)

50 LBB/BFR FOR MAIN CB / RAICA

59L1 / OVER VOLTAGE STAGE-1


50 LBB/BFR FOR TIE CB / RAICA

ABBNSD 50

DC +VE FROM PANEL

G4AD V9LC 2

DC –VE FROM PANEL

G4AD V9LC 1

PANEL-1

87 HZ / TEED-1 PROTECTION

87 LZ / TEED-2 PROTECTION

CONDITIONS FOR DIRECT TRIP1. 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 OPERATED10. 87 LZ TEED-2 PROTECTION OPERATED.

DIRECT TRIP SEND CARRIER CHANNEL- 2

T N C

MAIN CB(1-52CB)

T N C

TIE CB(2-52CB)

CONTROL PANEL





R Y B

R Y B

TIE CB (2-52 CB)

MAIN CB (1-52 CB)

50 LBB/BFR FOR MAIN CB / RAICA



50 LBB/BFR FOR TIE CB / RAICA

ABBNSD 50

DC +VE FROM PANEL

G4AD V9LC 2

DC –VE FROM PANEL

G4AD V9LC 1

PANEL-2

87 HZ / TEED-1 PROTECTION

87 LZ / TEED-2 PROTECTION

CONDITIONS FOR DIRECT TRIP1. 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 OPERATED10. 87 LZ TEED-2 PROTECTION OPERATED.

DIRECT TRIP RECEIVE CHANNEL-1&2

ABBNSD 50

G4AD V9LC 6

G4AD V9LC 5

ABBNSD 50

G4AD V9LC 6

G4AD V9LC 5

PANEL-1

PANEL-2

DC +VE

DC +VE

+VE -VE

TO 86-A MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR MAIN CB(152CB)TO 86-A MASTER TRIP RELAY(HIGH SPEED TRIP RELAY) FOR TIE CB(252CB)

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

TO 86-B MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FORTIE CB(252CB)

DIRECT TRIP-1CARRIER RECEIVE RELAY

DIRECT TRIP-2CARRIER RECEIVE RELAY

PLCC CARRIER PROTECTION SYSTEM(TELEPROTECTION)

C

E


REL 521MAIN-1

PROTECTION

C

E

1

2345678

9

10111213141516


C

E

1

2345678

9

10111213141516


C

E


REL 316MAIN-2

PROTECTION

PLCCPANEL

PLCCPANEL

NSD 50PANEL

NSD 50PANEL

NSD 50PANEL

NSD 50PANEL

ELECTRICAL CONNECTION


ELECTRICAL POWER LINE

FIBRE OPTIC PROTECTION SYSTEM(TELEPROTECTION)

C

E


REL 521MAIN-1

PROTECTION

C

E

1

2345678

9

10111213141516


C

E

1

2345678

9

10111213141516


C

E


REL 316MAIN-2

PROTECTION

NSD 70PANEL

NSD 70PANEL

NSD 70PANEL

NSD 70PANEL



FOX-UFOX-515

TUN

OS

GEC

OD

/ SIF

OX FOX-U

FOX-515

TUN

OS

GEC

OD

/ SIF

OX

FIBRE OPTIC CARRIER PROTECTION SYSTEM(TELEPROTECTION)

DIGITAL RELAY CONNECTION VIA FIBRE OPTIC

FOX-UFOX-515

TUN

OS

OTE

RM

FOX-UFOX-515

TUN

OS

OTE

RM

C

E


REL 521MAIN-1

PROTECTION

C

E

1

2345678

9

10111213141516


C

E

1

2345678

9

10111213141516


C

E


REL 316MAIN-2

PROTECTION

MAIN-1 & MAIN-2PROTECTION FOR

AUTO TRANSFORMER ADOPTED IN


SCHEMEPREPARED BY


BASICS OF TRANSFORMER PROTECTION1. 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.

2. PROTECTION DEVICES INBUILT OR MOUNTED ON POWER T/FA. 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.

3. TRANSFORMER DIFFERENTIAL PROTECTIONIT 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 PROTECTIONAT/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 PROTECTIONA 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 RELAYSA. 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).

1312.20 A220 KV721.71 A400 KV500 MVA1653.37 A220 KV909.35 A400 KV630 MVA

LV CURRENTLV VOLTAGEHV CURRENTHV

VOLTAGECAPACITY OF

TRANSFORMER

0826.68 A220 KV454.68 A400 KV315 MVA

NORMALLY ADOPTED POWER TRANSFORMERS CAPACITIES IN 400KV / 220KV

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

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

400 / 132100, 200 & 2507

HV & LV REF 64

220 / 6631.5, 50 & 1006

66 / 337.5 , 16 & 252

BUCHHOLZOVER FLUX OLTC OSRPRV/PRDOIL TEMP

WDNG TEMP

132 / 33 16 , 31.5 50 & 804

765 / 4001000 & 1500

10

3 DIR OL (HIGHSET)

+ 1 DIR EL

(HIGHSET)

3 DIR OL (HIGHSET)

+ 1 DIR EL

(HIGHSET)

400 / 220315, 500 & 630

9

OVER LOAD ALARM

RELAY + NEUTRAL

CURRENT E/F RELAY

87 TH / 64 REF

ICT / AUTO TFR

220 / 132100 & 1608

2 WINDING TRANSFORMER (STAR/STAR)

TYPE

220 / 3331.5, 5053 OVER LOAD + 1 DIRECTIONAL

EARTH FAULT RELAY ( 51P + 67N)

HV REF (64)

132 / 117.5 , 16 ,25 & 31.53

64REF IS 1-PH

HIG

H IM

PEDA

NC

E D

IFFEREN

TIAL R

ELAY

87TH IS 3-PH

HIG

H IM

PEDA

NC

E D

IFFEREN

TIAL R

ELAY

(PRIN

CPLE : C

IRC

ULA

TING

CU

RR

ENT)

BUCHHOLZ, OLTC OSROIL TEMP

WDNG TEMP3 OVER LOAD + 1 EARTH FAULT

RELAY ( 51 )

3 OL +1 EL (51)

NIL

87 TL DIFFER

ENTIA

L RELA

Y ( LO

W IM

PEDA

NC

E PERC

ENTA

GE B

IASED

PHA

SE SEGR

EGA

TED

DIFFER

ENTIA

L RELA

Y PRIN

CIPLE: M

ERZ PR

ICE)

66 / 117.5 & 161

LVHVPROTECTIONSPECIAL

PROTECTIONADDITIONAL PROTECTION

BACK UPPROTECTIONMAIN-2MAIN-1VOLTAGE

RATIO IN KV

CAPACITYIN

MVAS.No

ICT BUSHING CT INFORMATION

PSPSPSPSCLASS OF ACURACY625252525500

80808080160100100100100100

I MAGNETISING

IN mA at VKNEE

5

4.04.04.04.05002.52.52.52.5315

1.51.51.51.5100RCT IN OHMS4

2.02.02.02.0160

60606060315

1600 V1600 V1600 V1600V500

1000/11000/11000/11000/1600/11000/13151600/11600/11600/11600/11000/11600/1500

PURPOSE

VKNEE FOR PS & VA FOR MET

RATIO

WTINCT PROT87/64 REFWTIMET87/64 REFWTIMET87/64 REF7

1000 V1000 V1000 V1000 V315800 V800 V800 V800 V160

Parameters of W

TI CT for each w

inding shall be provided by the contractor

600 V600 VParam

eters of WTI C

T for each winding shall be

provided by the contractor

0.2 CLAND

BURDEN 30 VAISF:5

600 V

Parameters of W

TI CT for each w

inding shall be provided by the contractor.

0.2 CLAND

BURDEN 30 VAISF:5

600 V100

3

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

800/1800/1800/1800/1500/1800/1160- -

600/1600/1

- -

500/1600/1

- -

300/1600/1100

2

321321321CORE1LVNEUTRALIVHVITEM /MVAS.No

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

3 3 3

3 3 3

3-CT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

2-ACT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S35S3 5S3

P2P2P2 CT MB

CT MB

P2P2P2

5S4 5S4 5S4

5S35S3 5S3

3 3 3

LV-CT

CORE-5CTR: 1200-800/1A

CLASS: PS

5S1 5S1 5S1

5S35S3 5S3

P2P2P2

CT MB

AU

X.C

T Y

/

0.91

/ 0.

577A

AU

X.C

T Y

/

0.91

/ 0.

577A

AU

X.C

T Y

/

0.68

9 / 0

.577

A

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.

3 C

T M

ETH

OD

: 3-

CT

&

2-C

T4

CT

MET

HO

D :

3-C

T

& 2

-AC

T6

CT

MET

HO

D :

3-A

CT

& 2

-AC

T

87 T1

NUMERICAL RELAYS DOES NOT REQUIRE AUX CTs

MAIN / DIFFERENTIAL PROTECTION FOR AT/F(5 CT METHOD)

3 3 3

3-TCT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S35S3 5S3

P2P2P2 CT MB3 3 3

LV-CT

CORE-5CTR: 1200-800/1A

CLASS: PS

5S1 5S1 5S1

5S35S3 5S3

P2P2P2

CT MB

AU

X.C

T Y

/

0.91

/ 0.

577A

AU

X.C

T Y

/

0.68

9 / 0

.577

A

NORMALLY LOW IMPEDENCE BIASED

DIFFERENTIAL RELAY IS USED FOR

TRANSFORMER DIFFERENTIAL PROTECTION

87 T1

NUMERICAL RELAYS DOES NOT REQUIRE AUX CTs

SELECTION OF AUX.CTs FOR DIFFERENTIAL PROTECTIONNORMALLY 400KV/220KV AUTO TRANSFORMERS ARE OF CAPACITY 315MVA.FOR MERZ PRICE PROTECTION IF TRANSFORMER IS CONNECTED IN STAR/STARTHEN CT SECONDARIES ARE TO BE CONNECTED IN DELTA/DELTA.CORRECT RATIO CTs ARE NOT AVAILABLE, THEN AUX.CTs ARE TO BE PROVIDEDFOR 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 TORELAY, 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 : 2000-1000-500/1ANEAREST 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)

3 3 3

3 3 3

3-CT

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

CLASS: PS

2-ACT

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

CLASS: PS

4S4 4S4 4S4

4S34S3 4S3

P2P2P2 CT MB

CT MB

P2P2P2

4S4 4S4 4S4

4S34S3 4S3

CVT SELECTION

BUS-1 CVT / BUS-2 CVT /

LINE CVT

CORE-1VA : 200

CLASS: 3P

50Z

IR4 / C411IY4 / C431IB4 / C451

IN4 / C471

3 3 3

3 33

VR11 / E111

VY11 / E131

VB11 / E151

VN11 / E171

E172E174

IR4 / C411IY4 / C431IB4 / C451

3 C

T M

ETH

OD

: 3-

CT

&

2-C

T4

CT

MET

HO

D :

3-C

T

& 2

-AC

T6

CT

MET

HO

D :

3-A

CT

& 2

-AC

T

BACKUP PROTECTION FOR AT/F HV(5 CT METHOD)

3 3 3

3-TCT

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

CLASS: PS

4S4 4S4 4S4

4S34S3 4S3

P2P2P2 CT MB

CVT SELECTION


LINE CVT

CORE-1VA : 200

CLASS: 3P

IR4 / C411IY4 / C431IB4 / C451

IN4 / C471

3 3 3

3 33

VR11 / E111

VY11 / E131

VB11 / E151

VN11 / E171

E172E174

BACKUP PROTECTION FOR AT/F LV

3 3 3

LV-CT

CORE-4CTR: 1200 – 800 /1A

CLASS: PS

4S2 4S2 4S2

4S14S1 4S1

P1P1P1 CT MB

P2P2P2

VOLTAGE

SELECTION

BUS-1 PT /

BUS-2 PT

CORE-1VA : 200

CLASS: 3P

50Z

IR4 / C411IY4 / C431IB4 / C451

IN4 / C471

3 3 3

3 33

VR11 / E111

VY11 / E131

VB11 / E151

VN11 / E171

E172E174

MISCELLENEOUSRELAYS & PROTECTIONS

ADOPTED FOR AUTO TRANSFORMER IN


SCHEME (OVER FLUX & REF FUNCTIONS)PREPARED BY


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

99 T LV

CVT SELECTION

BUS-1 CVT /

BUS-2 CVT /

LINE CVT

CORE-1VA : 200

CLASS: 3P

VOLTAGE

SELECTION

BUS-1 PT /

BUS-2 PT

CORE-1VA : 200

CLASS: 3P

99 T HV

315MVA, 400KV/220KV/33KV AT/FRESTRICTED EARTH FAULT RELAY

3 3 3

3 3 3400KV HV

BUSHING CT

CORE-1CTR: 1000/1A

CLASS: PS

220KV LV

BUSHING CT

CORE-1CTR: 1000/1A

CLASS: PS

P2P2P2

P2P2P2

3 3 3NEUTRAL

BUSHING CT

CORE-1CTR: 1000/ 1A

CLASS: PS

P1P1P1P1P1P1

P2P2P2

P1P1P1

S2S2S2

S2S2S2

S2S2S2

S1S1S1

S1S1S1

S1S1S1

315MVA, 400KV/220KV/33KV AT/F3-PH HIGH IMPEDENCE DIFFERENTIAL RELAY

3 3 3

3 3 3400KV HV

BUSHING CT

CORE-1CTR: 1000/1A

CLASS: PS

220KV LV

BUSHING CT

CORE-1CTR: 1000/1A

CLASS: PS

P2P2P2

P2P2P2

3 3 3NEUTRAL

BUSHING CT

CORE-1CTR: 1000/ 1A

CLASS: PS

P1P1P1P1P1P1

P2P2P2

P1P1P1

S2S2S2

S2S2S2

S1S1S1

S1S1S1

S1S1S1

S2S2S2

315MVA, 400KV/220KV AT/F VOLAGE SELECTION

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.

LINECVT

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.

BUS-2CVT

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.

BUS-1CVT

FEEDER HAVING LINE CVTs &BUSES ARE HAVING BUS CVTs BUT AT/Fs ARENOT HAVING CVTs. FOR TRANSFORMER PANEL, PT SUPPLY IS SELECTED AS

PER SELECTION DESCRIBED BELOW FOR METERING AND PROTECTION, WHICH IS FIRST SELECTED .

1-52CB 2-52CB 3-52CBBUS-1 BUS-2

LINE1 AT/F-1

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

1 2 3 4 5 6 7

SPA

RE

R Y B

R Y B R Y B

R Y B

MAIN-1 & MAIN-2PROTECTION FORSHUNT REACTOR

ADOPTED IN ONE AND HALF



ADE/MRT(PROTECTION)

BASICS OF SHUNT REACTOR1. TYPES OF REACTORS :

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

B. BUS REACTORTHE 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 REACTORSARE 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.

3. SELECTION OF REACTORA. LINE REACTORNORMALLY 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.

4. LOCATION OF REACTORS WITH CAPACITY IN APTRANSCOA. LINE REACTOR1. 400KV KALAPAKA-KHAMMAM 1 AT BOTH ENDS – 63MVAR 2. 400KV KALAPAKA-KHAMMAM 2 AT BOTH ENDS – 63MVARB. BUS REACTOR1. 400KV KALAPAKA SS – 2 X 50 MVAR2. 400KV NUNNA SS(PGCIL BAYS) – 1 x 63 MVAR

5. PURPOSE OF SHUNT REACTOR PROTECTIONTHE 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.

6. PROTECTION DEVICES INBUILT OR MOUNTED ON REACTORA. 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.

7. REACTOR DIFFERENTIAL PROTECTIONIT 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.

8. BACK-UP PROTECTIONA 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>).

9. RESTRICTED EARTH FAULT PROTECTIONIF, 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 )

LINE 1

1-89

1-89A

1-52CB

1-CT3

3

3-89

3-89A

3-52CB

3-CT3

2-52CB

2-CT

2-89A 2-89B

1-89L

BUS-1 BUS-2

P1

P1

P1

P2 P2

P2

U UU

LINESHUNT

REACTOR

1-89R

U UU

BUSSHUNT

REACTOR

.3-89R

U UUU

.

IL

INTER LOCK FACILITY:WHEN 1-89R CLOSES ONLY

PERMIT TO CLOSE 1-89L AND1-89L OPENS ONLY

PERMIT TO OPEN 1-89R.

IL

1-PH NEUTRAL GROUNDING REACTOR

REACTOR BUSHING CT INFORMATIONCAPACITY OF 400KV REACTORS : 50, 63, 80, 125 MVAR

NGRSHUNT REACTORITEMSr

NOEARTH SIDELINE SIDESTAR / NEUTRAL SIDE400KV / LINE SIDE

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

200/1200/1200/1200/1WTI200/12000-1000-500/1

2000-1000-500/1

200/1200/1200/1RATIO1

NEUTRAN BUSHING CT : BEFORE STAR FORMATION IN RYB PHASES

64 RREF1/2

64 RREF2

64 RREF1

87 RDIFFMET

FOR 21L1 /TEED-1 /

BBM

FOR 21L2 /TEED-2 /

BBC21 R IMP

64 R REF1

87 RDIFFPURPOSE5

PSPSPSPSPSPSPSPSPSCLASS OF ACURACY4

1 OHM1 OHM1 OHM1 OHM10 – 5 – 2.5 OHM

10 – 5 –2.5

OHM1 OHM1 OHM1 OHMRCT IN OHMS3

200V200V200V200V

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

1.0 CLAND

BURDEN 10 VA

1000-500-250V

1000-500-250V

200V200V200VVKNEE FOR PS

& VA FOR MET

2

SHUNT REACTOR PROTECTION

400KV SIDE

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

DOUBLE ZONE TYPE.CORE-3

87 BBC/BB-221L2(M_CT+T_CT – R_CT)

87 TEED-2(M_CT, T_CT, R_CT)

21L2(M_CT + T_CT – R_CT)

CORE-4

87 BBM/BB-121L1(M_CT + T_CT – R_CT)

87 TEED-1(M_CT, T_CT, R_CT)

21L1(M_CT + T_CT – R_CT)

CORE-5

64R - REACTOR RESTRICTED EARTH FAULT PROTECTION OF1-POLE HIGH IMPEDANCE TYPE. (REF1)CORE-2

87R – 3Ph, 2Wdg REACTOR DIFFERENTIAL RELAY EITHER LOW or HIGH IMPEDANCE TYPE.CORE-1

BUSLINEBUSLINE

DOUBLE BUS & TRANSFER BUS SYSTEM

ONE & HALF BREAKER SYSTEMCORES

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

SHUNT REACTOR PROTECTION

NEUTRAL GROUNDING REACTOR SIDE- -64 REF2- -64 REF1CORE-1

STAR / NEUTRAL SIDE

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

64R - REACTOR RESTRICTED EARTH FAULT PROTECTION OF1-POLE HIGH IMPEDANCE TYPE .(REF1)CORE-4

- -64 REF 1 / 2- -64 REF1CORE-2

WINDING TEMPARETURE OF REACTORCORE-2METERING OF REACTORCORE-1

BUSLINEBUSLINE

DOUBLE BUS & TRANSFER BUS SYSTEM

ONE & HALF BREAKER SYSTEMCORES

U UU

LINESHUNT

REACTOR

.1-PH NEUTRAL

GROUNDING REACTOR

3

3

3

3

3

3

3

3

U UU

3

3

3

3

3

3

3

3

3

U UU

3

3

3

3

3

3

3

3

U UU

3

3CORE -1

CORE -2

CORE -3

CORE -4

CORE -5

CORE -1

CORE -2

CORE -3

CORE -4

CORE -1

CORE -2

REA

CTO

R B

USH

ING

CT

INFO

RM

ATI

ON

U UU

BUSSHUNT

REACTOR

.

3

3

3

3

3

3

3

3

U UU

3

3

3

3

3

3

3

3

3

U UU

3

3

3

3

3

3

3

3

CORE -1

CORE -2

CORE -3

CORE -4

CORE -5

CORE -1

CORE -2

CORE -3

CORE -4

REA

CTO

R B

USH

ING

CT

INFO

RM

ATI

ON

ONE & HALF BREAKER LINE & BUS SHUNT REACTOR PROTECTION SCHEME87BB1

87BB2

CVT

CVT

VBB1

VBB2

79

25

79

25

79

25VBB2

BF

BFVL2 / VL1

OR VBB1

VL1 / VL2

OR VBB2

VBB1

FEEDER1 / LINE1

87L 21M2 CVT VL1

BF

VL1

BUSBAR-1

BUSBAR-2

TEED-2PROTECTION OF BUS REACTOR

21M1 VL1

VL1 / VBB1

VL2 / VBB2

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

UU U UUU

87R

64R

OR

21R

UUU

87R

64R

VL1/V

BB1/V

BB2

VBB1/

VBB2

21R

TEED-1

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

3 3 3

R-CT

HV BUSHING

CORE-1CTR: 200/1A

CLASS: PS

1S2 1S2 1S2

1S11S1 1S1

P2P2P2 CT MB3 3 3

R-CT

STAR BUSHING

CORE-3CTR: 200/1A

CLASS: PS

3S1 3S1 3S1

3S23S2 3S2

P2P2P2

CT MB

C

E

DISPLAY

ACTIVE START TRIP

RET 670

NORMALLYLOW / 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

C

E

DISPLAY

ACTIVE START TRIP

RET 6703 3 3

3 3 3R-CT HV

BUSHING CT

CORE-1CTR: 200/1A

CLASS: PS

R-CT STAR

BUSHING CT

CORE-3CTR: 200/1A

CLASS: PS

P2P2P2

P2P2P2

P1P1P1

P1P1P1

1S21S21S2

3S23S23S2

1S11S11S1

3S13S13S1

LINE/BUS REACTOR DIFFERENTIAL PROTECTION (HIGH IMPEDANCE DIFFERENTIAL PROTECTION)

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

NORMALLYLOW / HIGH IMPEDENCE DIFFERENTIAL RELAY IS

USED FOR BUS / LINE REACTOR

DIFFERENTIAL PROTECTION

C

E

DISPLAY

ACTIVE START TRIP

RET 6703 3 3

3 3 3P2P2P2

P2P2P2

P1P1P1

P1P1P1

2S22S22S2

4S24S24S2

4S14S14S1

2S12S12S1

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

R-CT HV

BUSHING CT

CORE-2CTR: 200/1A

CLASS: PS

R-CT STAR

BUSHING CT

CORE-4CTR: 200/1A

CLASS: PS


NORMALLYHIGH 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.

3 3 3

3 3 3P2P2P2

P2P2P2

P1P1P1

P1P1P1

2S22S22S2

2S22S22S2

2S12S12S1

2S12S12S1

LINE REACTOR REF PROTECTION (NGR IS AVAIALBLE)

R-CT HV

BUSHING CT

CORE-2CTR: 200/1A

CLASS: PS

NGR-CT EARTH

BUSHING CT

CORE-2CTR: 200/1A

CLASS: PS


C

E

DISPLAY

ACTIVE START TRIP

RET 670 NORMALLYHIGH 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.

3 3 3

3 3 3P2P2P2

P2P2P2

P1P1P1

P1P1P1

2S22S22S2

4S24S24S2

4S14S14S1

2S12S12S1

LINE REACTOR 2 NOs REF PROTECTIONS (NGR IS AVAIALBLE)

R-CT HV

BUSHING CT

CORE-2CTR: 200/1A

CLASS: PS

R-CT STAR

BUSHING CT

CORE-4CTR: 200/1A

CLASS: PS

3 3 31S2 1S2 1S2

1S11S1 1S1

P1P1P1

CT MB

C

E

DISPLAY

ACTIVE START TRIP

RET 670

P2P2P2

3 3 32S1 2S1 2S1

2S22S2 2S2

P2P2P2

CT MBP1P1P1

NORMALLYHIGH 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.

NGR-CT BUSHING CTCORE - 1 & 2

CTR: 200/1A

CLASS: PS

C

E

DISPLAY

ACTIVE START TRIP

REL 6703 3 3

IR3 / A311IY3 / A331IB3 / A351

IN3 / A3713S2 3S2 3S2

3S13S1 3S1


LINE/BUS REACTOR B/U IMPEDANCE PROTECTION

R-CT HV

BUSHING CT

CORE-3CTR: 200/1A

CLASS: PS CVT SELECTION


LINE CVT

CORE-1VA : 200

CLASS: 3P

LINE REACTOR PROTECTION FOR LINE(MAIN-1 PROTECTION)

C

E

DISPLAY

ACTIVE START TRIP

REL 5213 3 3

3 3 3

IR5 / A511IY5 / A531IB5 / A551

IN5 / A571

1-CT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

2-CT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

5S4 5S4 5S4

5S25S2 5S2

P2P2P2 CT MB

P2P2P2

5S4 5S4 5S4

5S25S2 5S2

VR11 / E111VY11 / E131VB11 / E151VN11 / E171

1-CVT

CORE – 1

200VA

CLASS: 3P

3 3 3LR-CT 400KV

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

P1P1P1

5S2 5S2 5S2

5S45S4 5S4

LINE REACTOR PROTECTION FOR LINE(MAIN-2 PROTECTION)

C

E

DISPLAY

ACTIVE START TRIP

REL 3163 3 3

3 3 3

IR4 / A411IY4 / A431IB4 / A451

IN4 / A471

1-CT

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

CLASS: PS

2-CT

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

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2

P2P2P2 CT MB

P2P2P2

4S4 4S4 4S4

4S24S2 4S2

VR21 / E211VY21 / E231VB21 / E251VN21 / E271

1-CVT

CORE – 2

200VA

CLASS: 3P

3 3 3LR-CT 400KV

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

CLASS: PS

P1P1P1

4S2 4S2 4S2

4S44S4 4S4

BUS REACTOR TEED-1 PROTECTION{BAY3&2}

C

E

DISPLAY

ACTIVE START TRIP

RET 670

3 3 3

3 3 33-CT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

BR-LCT

CORE-5CTR: 2000-1000-500/1A

CLASS: PS

P2P2P2

P1P1P1

3 3 32-CT

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

CLASS: PS

P1P1P1P2P2P2

P1P1P1

P2P2P2

5S4 5S4 5S4

5S25S2 5S2

1S4 1S4 1S4

1S21S2 1S2

4S4 4S4 4S4

4S24S2 4S2 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

IR5IY5IB5

IN5

IR5IY5IB5

IN5

IR1IY1IB1

IN1

BUS REACTOR TEED-2 PROTECTION{BAY3&2}

3 3 3

3 3 33-CT

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

CLASS: PS

BR-CT

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

CLASS: PS

4S4 4S4 4S4

4S24S2 4S2

P2P2P2 CT MB

CT MBP2P2P2

4S2 4S2 4S2

4S44S4 4S4

3 3 3

2-CT

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

CLASS: PS

2S2 2S2 2S2

2S42S4 2S4

P2P2P2CT MB

C

E

DISPLAY

ACTIVE START TRIP

RET 670

RA

ICA

LBB

/BFR

RA

ICA

LBB

/BFR

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.

3 3 3

IR2 / D211IY2 / D231IB2 / D251

IN2 / D271

R-CT STAR

BUSHING CT

CORE-2CTR: 200/1A

CLASS: 0.2

2S2 2S2 2S2

2S12S1 2S1

P2P2P2 CT MB

VR31 / E311VY31 / E331VB31 / E351

VN31 / E371

BASED ON SELECTION

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

CORE – 3

100VA

CLASS: 0.2

REACTOR MULTI FUNCTION PANEL METERING

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

RATUB

V/F RELAYLINE

RATUB

V/F RELAYBUS

CVT SELECTION

BUS-1 CVT /

BUS-2 CVT /

LINE CVT

CORE-1VA : 200

CLASS: 3P

VOLTAGE

SELECTION

BUS-1 PT /

BUS-2 PT

CORE-1VA : 200

CLASS: 3P

CARRIER INTERTRIPPING OF LINE SHUNT REACTORLINE 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

21R REACTOR IMPEDENCE RELAY

64R RESTRICTED EARTH FAULT RELAY

ABBNSD 50

DC +VE FROM PANEL

G4AD V9LC 2

DC –VE FROM PANELG4AD V9LC 1

LINE PROTECTION COUPLER PANEL-1

ABBNSD 50

DC +VE FROM PANEL

G4AD V9LC 2

DC –VE FROM PANELG4AD V9LC 1

LINE PROTECTION COUPLER PANEL-2

RET 670

REL 670

RET 670REACTORS INTERNAL FAULTS

87R REACTOR DIFFERENTIAL RELAY

21R REACTOR IMPEDENCE RELAY

64R RESTRICTED EARTH FAULT RELAY

REACTORS INTERNAL FAULTS

GROUP-1/A TRIPPINGS

GROUP-2/B TRIPPINGS

RET 670

REL 670

RET 670

ADDITIONAL AND SPECIAL FUNCTIONS

ADOPTED INONE AND HALF

CIRCUIT BREAKERSCHEME

(EVENT LOGGER & DISTURBANCE RECORDER) PREPARED BY


400KV SUBSTATION: MAMIDIPALLY EVENT LOGGER EVENTS INFORMATION19 MAR 2004 13:00:00A 13:09:37.090 # 195 400KV SRISAILAM-2 MAIN-2 RAZFE PROT TRIP A 13:09:37.096 # 188 400KV SRISAILAM-2 MAIN-1 REL100 PROT START’Y’A 13:09:37.097 # 187 400KV SRISAILAM-2 MAIN-1 REL100 PROT START’R’A 13:09:37.100 # 181 400KV SRISAILAM-2 MAIN-1 REL100 PROT TRIPA 13:09:37.104 # 162 400KV SRISAILAM-2 MAIN CB 752 Y-PH OPENA 13:09:37.110 # 196 400KV SRISAILAM-2 MAIN-2 RAZFE CARRIER SENDA 13:09:37.110 # 170 400KV SRISAILAM-2 AT/F-2 TIE CB 852 B-PH OPENA 13:09:37.111 # 161 400KV SRISAILAM-2 MAIN CB 752 R-PH OPENA 13:09:37.111 # 163 400KV SRISAILAM-2 MAIN CB 752 B-PH OPENA 13:09:37.111 # 169 400KV SRISAILAM-2 AT/F-2 TIE CB 852 Y-PH OPENA 13:09:37.112 # 168 400KV SRISAILAM-2 AT/F-2 TIE CB 852 R-PH OPENA 13:09:37.113 # 182 400KV SRISAILAM-2 MAIN-1 REL100 CARRIER SENDA 13:09:37.126 # 199 400KV SRISAILAM-2 CARRIER PROT CH-2 RECEIVEDA 13:09:37.140 # 185 400KV SRISAILAM-2 CARRIER PROT CH-1 RECEIVEDN 13:09:37.147 # 195 400KV SRISAILAM-2 MAIN-2 RAZFE PROT TRIP RESETN 13:09:37.148 # 196 400KV SRISAILAM-2 MAIN-2 RAZFE CARRIER SEND RESETN 13:09:37.175 # 187 400KV SRISAILAM-2 MAIN-1 REL100 START ‘R’ RESETN 13:09:37.176 # 181 400KV SRISAILAM-2 MAIN-1 REL100 PROT TRIP RESETN 13:09:37.176 # 188 400KV SRISAILAM-2 MAIN-1 REL100 START ‘Y’ RESETN 13:09:37.185 # 182 400KV SRISAILAM-2 MAIN-1 REL100 CARRIER SEND RESETN 13:09:37.257 # 199 400KV SRISAILAM-2 CARRIER PROT CH-2 RECEIVED RESETN 13:09:37.279 # 185 400KV SRISAILAM-2 CARRIER PROT CH-1 RECEIVED RESET19 MAR 2004 14:00:00N 14:09:48.702 # 163 400KV SRISAILAM-2 MAIN CB 752 B-PH CLOSEN 14:09:48.704 # 161 400KV SRISAILAM-2 MAIN CB 752 R-PH CLOSEN 14:09:48.720 # 162 400KV SRISAILAM-2 MAIN CB 752 Y-PH CLOSEN 14:10:00.903 # 169 400KV SRISAILAM-2 AT/F-2 TIE CB 852 Y-PH CLOSEN 14:10:00.907 # 168 400KV SRISAILAM-2 AT/F-2 TIE CB 852 R-PH CLOSEN 14:10:00.907 # 170 400KV SRISAILAM-2 AT/F-2 TIE CB 852 B-PH CLOSE19 MAR 2004 15:00:00

R PH VOLTAGE

Y PH VOLTAGE

B PH VOLTAGE

OPEN DELTA VOLTAGE

R PH CURRENT

Y PH CURRENT

B PH CURRENT

STAR/NEUTRAL CURRENTMAIN CB R PH OPENMAIN CB Y PH OPENMAIN CB B PH OPEN

TIE CB R PH OPENTIE CB Y PH OPENTIE CB B PH OPEN

MAIN/TIE CB LBB OPTDDIRECT TRIP CH-1/2 OPTD

BUSBAR PROT OPTDMAIN-1 PROT OPTDMAIN-2 PROT OPTD

OVER VOLTAGE STAGE-1/2 OPTDSTUB PROT-1/2 OPTD

MAIN-1 PROT CARRIER RECEIVEMAIN-2 PROT CARRIER RECEIVE

DF/DT OPTD

EVENT NONAME OF FEEDERDATE & TIME

DIS

TUR

BA

NC

E R

ECO

RD

ER

PREFERRED DISTURBANCE RECORDER ANALOG CHANNELS1. R-PH VOLTAGE2. Y-PH VOLTAGE3. B-PH VOLTAGE4. OPEN DELTA VOLTAGE5. R-PH CURRENT6. Y-PH CURRENT7. B-PH CURRENT8. NEUTRAL/STAR CURRENTDIGITAL CHANNELS1. HV MAIN CB R-PH OPEN2. HV MAIN CB Y-PH OPEN3. HV MAIN CB B-PH OPEN4. HV TIE CB R-PH OPEN5. HV TIE CB Y-PH OPEN6. HV TIE CB B-PH OPEN7. 21 MAIN1 REL 521 OPERATED8. 21 MAIN2 REL 316 OPERATED9. 87 BUSBAR RELAY OPERATED10. MAIN CB A/R OPERATED11. TIE CB A/R OPERATED12. PSB OPERATED13. SOTF OPERATED14. 27 O/V STG-1/2 OPERATED15. 51 STUB-1/2 OPERATED16. 87HZ / LZ TEED-1/2 OPERATED17. MAIN CB LBB OPERATED18. TIE CB LBB OPERATED 19. DIRECT TRIP CH-1/2 TRIP20. 21M1 / 21M2 CARRIER RECEIVE21. 86 GR-A/B RELAY OPERATED22. 67N DEF/TEF RLY OPERATED23. DF/DT RELAY OPERATED

400 KV LINESDIGITAL CHANNELS1. HV MAIN CB R-PH OPEN2. HV MAIN CB Y-PH OPEN3. HV MAIN CB B-PH OPEN4. HV TIE CB R-PH OPEN5. HV TIE CB Y-PH OPEN6. HV TIE CB B-PH OPEN7. LV 220 CB R-PH OPEN8. LV 220 CB Y-PH OPEN9. LV 220 CB B-PH OPEN10 87 LZ DIFF RLY OPERATED11. HV 67 ABCN OPERATED12. LV 67 ABCN OPERATED13. 51 O/L RLY OPERATED14. 64 REF / 87 HZ RLY OPERATED15. NDR RLY OPERATED 16. HV 99T OVER FLUX OPTD17. LV 99T OVER FLUX OPTD18. HV 400 BUSBAR OPERATED19. LV 220 BUSBAR OPERATED20. HV MAIN CB LBB OPERATED21. HV TIE CB LBB OPERATED 22. LV 220 CB LBB OPERATED23. HV 86 GR-A/B RELAY OPTD24. LV 86 GR-A/B RELAY OPTD25. AT/F 21T UZ RELAY OPERATED26. OIL TEMP HIGH TRIP27. WNDG TEMP HV/IV/LV TRIP28. BUCHHOLZ MAIN/OLTC TRIP29. PRD 1/ 2 TRIP 30. AT/F NEUTRAL CURRENT TRIP

ANALOG CHANNELS1. HV R-PH VOLTAGE2. HV Y-PH VOLTAGE3. HV B-PH VOLTAGE4. HV OPEN DELTA VOLTAGE5. LV R-PH VOLTAGE6. LV Y-PH VOLTAGE7. LV B-PH VOLTAGE8. LV OPEN DELTA VOLTAGE9. HV R-PH CURRENT10. HV Y-PH CURRENT11. HV B-PH CURRENT12. HV NEUTRAL/STAR CURRENT13. LV R-PH CURRENT14. LV Y-PH CURRENT15. LV B-PH CURRENT16. LV NEUTRAL/STAR CURRENT

400 KV TRANSFORMER

CONFIGUARATION OF CONTROL &

RELAY PANELS IN ONE AND HALF



ADE/MRT(PROTECTION)

CONFIGUARATION OF C & R PANEL

1. MAIN-1 NUM. DIST. PROT2. 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 RELAYS8. TEED-1 PROTECTION9. TEED-2 PROTECTION10. STUB-1/2 PROTECTION (EXT/ INBUILT)11. AUXILIARY RELAYS12. MAIN-1 CARRIER SEL.SWITCH13. MAIN-2 CARRIER SEL.SWITCH14. CARRIER RECEIVE RELAYS15. FLAG RELAYS16. TIMERS17. PANEL INDICATING LABEL

1. BREAKER FAILURE RELAY2. AUTO RECLOSURE RELAY3. CHECK SYNCHRONISING RELAY4. CB ALARM RELAYS5. CB TRIP CKT SUPERVISION RELAYS6. 3-PH TRIP UNITS 86-GA & 86-GB 7. 1-PH TRIP RELAYS M1, M2 - 1 2 Nos8. DIRECT TRIP RECEIVE RELAYS9. DC SUPERVISION RELAYS 10. U/V RELAY E/S I/L11. CB MULTIPLICATION RELAY12. TEST TERMINAL BLOCK13. ENERGY METER14. AUX RELAYS15. PANEL INDICATING LABEL

1. AMMETERS IN 3Phs 2. VOLTMETER WITH SEL. SWITCH3. WATTMETER 4. VAR METER5. 20W ANNUCIATION FACIA6. CB CONTROL (TNC) SWITCH7. ISO CONTROL (TNC) SWITCH8. SEMAPHORE FOR EARTH SWITCH9. INDICATING LAMPS FOR CB G&R10. INDICATING LAMPS FOR ISO11. INDICATING LAMPS FOR DC 12. INDICATING LAMPS FOR ISO I/L13. PUSH BUTTON FOR ANNUNCIATION14. SYNCHRONISING SOCKET FOR CB15. SYNCHRONISING SEL.SWITCH16. PROTECTION TRANSFER17. MIMIC TO REPRESENT SLD18. CUTOUT FOR RWTI WITH SEL .SWI.19. PANEL INDICATING LABEL* IN CASE OF ONE AND HALF CB SYSTEM CONTROL PANEL FOR FULL DIA IS TO BE AVAILABLE

LINE PROTECTION PANELCB RELAY PANELCONTROL PANEL

CONFIGUARATION OF C & R PANELTRANSFORMER PROTECTION PANEL

1. REACTOR DIFFERENTIAL PROTECTION2. REF PROTECTION RELAY3. REACTOR IMPEDENCE PROTECTION4. CVT SELECTION RELAYS5. FLAG RELAYS6. AUX RELAYS7. TIMERS8. CIRCUIT LABEL

1. DIRECTIONAL O/L E/F RELAYS2. OVER FLUX PROTECTION3. NEUTRAL DISPALCEMENT RELAY4. VOLTAGE SELECTION RELAYS5. FUSE FAILURE RELAY6. AUX RELAYS FOR T/F TROBLES7. FLAG RELAYS8. TIMERS9. CIRCUIT LABEL

1. T/F DIFFERENTIAL PROTECTION2. REF PROTECTION RELAY3. DIRECTIONAL O/L E/F RELAYS4. OVER FLUX PROTECTION5. OVER LOAD PROTECTION6. VOLTAGE SELECTION RELAYS7. FUSE FAILURE RELAY8. AUX RELAYS FOR T/F TROBLES9. FLAG RELAYS10. TIMERS11. CIRCUIT LABEL

REACTOR PROTECTION PANELMV PROTECTION PANELHV PROTECTION PANEL

IN ADDITION TO THE ABOVE THE FOLLOWING PANELS WILL BE AVAILABLE1. CONTROL PANELS FOR LINE, T/F, B/C, TBC, BUS REACTOR (AS & WHEN REQ)2. COMMON CONTROL PANEL3. BUS BAR PROTECTION PANELS4. 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 – RTRDLINE 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

79 + 25(AUTO RECLOSURE + CHECK SYNC RELAY)

50 Z(LBB / BFR)

4RLA

CB TROUBLE ALARAM AND TRIP RELAYS

TSRTC-1

TSRTC-1I

DCI & II

86 GR -A1-PH TRIPRELAYS -6FOR 21M1

86 GR -B1-PH TRIPRELAYS -6FOR 21M2

BREAKERMULTIPLICATION RELAY

UNDER VOLTAGE

RELAY

D/T CH-1 RECEIVERELAYS


400KV LINE CB RELAY & PROTN PANEL


50 Z(LBB / BFR)

4RTB


TSRTC-1

TSRTC-1I

DCI & II






21 MAIN 1

21 MAIN 2

DC

-1

DC

-1I

4RLB

59 L1O/V STG-1

59 L2O/V STG-1i

87 LOWTEED-2

21 MAIN 1AUX RELYS

21 MAIN 1iAUX RELYS

87 HIGHTEED-1


50 Z(LBB / BFR)

4RLA


TSRTC-1

TSRTC-1I

DCI & II



BREAKERMULTIPLIC

ATION RELAY

UNDER VOLTAGE

RELAY



400KV LINE + R CB RELAY & PROTN PANEL


50 Z(LBB / BFR)

4RTB


TSRTC-1

TSRTC-1I

DCI & II






21 MAIN 1

21 MAIN 2

DC

-1

DC

-1I

4RLC

59 L1O/V STG-1

59 L2O/V STG-1i

87 LOWTEED-2

21 MAIN 1AUX RELYS

21 MAIN 1iAUX RELYS

87 HIGHTEED-1

87 MAIN HIGH IMP

21 IMPDISTANCE

DC

-1

DC

-1I

4RLRB

75 A75 B75 L

64 REFHIGH SPEED

AUX TRIPRELAYS

400KV ICT HV + IV CB RELAY & PROTN PANEL

50 Z(LBB / BFR)

4RTRA


TSRTC-1

TSRTC-1I

DCI & II

86 GR -A 86 GR -B


INTER TRIP RECEIVERELAYS

INTER TRIP RECEIVERELAYS

87 MAIN 1LOW IMP

87 MAIN 2HIGH IMP

DC

-1

DC

-1I

4RTRB

87 HIGHTEED-1

87 LOWTEED-2

75 A75 B75 L

75 A75 B

67 HV 67 IV

99THV O/F

99TIV O/F

ICT / ATF TROUBLESALARAM & TRIP FLAG RELAYS

AUX RLYSFOR HV

AUX RLYSFOR IV

HIGH SPEED AUX TRIPRELAYS

50 Z(LBB / BFR)

4RTRC


TSRTC-1

TSRTC-1I

DCI & II

86 GR -A 86 GR -B


AUX RLYS INTER TRIP

RECEIVE

AUX RLYS INTERTRIP RECEIVE

400KV BUS REACTOR CB RELAY & PROTN PANEL


50 Z(LBB / BFR)

4RTB


TSRTC-1

TSRTC-1I

DCI & II






87 MAIN HIGH IMP

21 IMPDISTANCE

DC

-1

DC

-1I

4RBRB

75 A75 B

64 REFHIGH SPEED

AUX TRIPRELAYS

87 HIGHTEED-1

87 LOWTEED-2

50 Z(LBB / BFR)

4RBRA


TSRTC-1

TSRTC-1I

DCI & II

86 GR -A 86 GR -B


400KV BUSBAR PROTECTION & COMMON CONTROL PANEL4RBB2 BBM1 + 96 UNITS 4RBB3 BBM2 + 96 UNITS


1. MAIN-1 NUM. DIST. PROT2. 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 RELAYS8. TEED-1 PROTECTION9. TEED-2 PROTECTION10. STUB-1/2 PROTECTION (EXT/ INBUILT)11. MAIN-1 CARRIER SEL.SWITCH12. MAIN-2 CARRIER SEL.SWITCH13. CARRIER RECEIVE RELAYS14.PANEL INDICATING LABEL

1. BAY CONTROL UNIT 2. BREAKER FAILURE RELAY3. AUTO RECLOSURE RELAY4. CHECK SYNCHRONISING RELAY5. CB ALARM RELAYS6. CB TRIP CKT SUPERVISION RELAYS7. 3-PH TRIP UNITS 86-GA, 86-GB & 96/50Z 8. 1-PH TRIP RELAYS M1, M2 - 1 2 Nos9. DIRECT TRIP RECEIVE RELAYS10. DC SUPERVISION RELAYS 11. U/V RELAY E/S I/L12. CB EMERGENCY TNC SWITCH 13. CLOSING AUX RELAYS14. ENERGY METER WITH TTB15. PANEL INDICATING LABEL

1. BCU-1 2. BCU-23. BUSBAR CENTRAL UNIT 4. BUS-1 ES CMR5. BUS-2 ES CMR6. DC-1 HEALTHY INDICATION7. DC-2 HEALTHY INDICATION8. BUSBAR PROT AUX RELAYS9. CLOSING AUX RELAYS

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

LINE PROTECTION PANELCB RELAY PANELBUSBAR PANEL


1. BAY CONTROL UNIT 2. BREAKER FAILURE RELAY3. CB ALARM RELAYS4. CB TRIP CKT SUPERVISION RELAYS5. 3-PH TRIP UNITS 86-GA, 86-GB & 96/50Z6. DC SUPERVISION RELAYS 7. U/V RELAY E/S I/L8. CB EMERGENCY TNC SWITCH 9. MFM WITH TTB10. PANEL INDICATING LABEL

BUS REACTORCB RELAY PANEL

TRANSFORMER PROTECTION PANEL

1. REACTOR DIFFERENTIAL PROT2. REF PROTECTION RELAY3. REACTOR IMPEDENCE PROTECTION4. CVT SELECTION RELAYS5. FLAG RELAYS6. AUX RELAYS7. TIMERS8. CIRCUIT LABEL

1. T/F DIFFERENTIAL PROTECTION-12. T/F DIFFERENTIAL PROTECTION-23. DIRECTIONAL O/L E/F RELAYS-HV4. DIRECTIONAL O/L E/F RELAYS-LV4. OVER FLUX PROTECTION-HV & LV5. OVER LOAD PROTECTION6. VOLTAGE SELECT RELAYS- HV & LV7. FUSE FAILURE RELAY- HV & LV8. AUX RELAYS FOR T/F TROBLES9. CIRCUIT LABEL

LINE / BUS REACTOR PROTECTION PANEL

IN ADDITION TO THE ABOVE THE FOLLOWING PANELS WILL BE AVAILABLE1. CONTROL & RELAY PANEL B/C, B/S, TBC (AS & WHEN REQ)2. COMMON CONTROL PANEL IS PART OF BUSBAR PANELI. 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

BCU1 BCU2

BUSBARCENTRAL UNIT

4RBB

DC-1DC-289

BB

1A

E C

MR

89B

B2

AE

CM

R BusBarAux

relays

BCU3

BUSBARCENTRAL UNIT

2 RBB

DC-1

DC-2

BCU1 BCU2

89B

B1

AE

CM

R

89B

B2

AE

CM

R BusBarAux

relays

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

FINALLY THE CONCEPT AS FOLLOWS IN FUTUREFOR FEEDER : REDUNDANT DISTANCE PROTECTION.FOR ICT : REDUNDANT DIFFERENTIAL PROTECTION.FOR BUSBAR : REDUNDANT BUSBAR PROTECTION.

400KV LINE + REACTOR CB RELAY & PROTN PANEL

BAY1 BCU

4RLA

A/R+SC79+25

LBB/ BU50Z

CB TROUBLES& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

186R1,Y1,B1R2,Y2,B2

DC

-1

86 GR-B

286R1,Y1,B1R2,Y2,B2 D

C-2

CB PB

9650Z

4RLB

21L1

21L2

59-1&2

D/T-1ReceiveRelays

D/T-2ReceiveRelays

BAY2 BCU

4RTB2

A/R+SC79+25

LBB/ BU50Z

CB TROUBLES& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

186R1,Y1,B1R2,Y2,B2

DC

-1

86 GR-B

286R1,Y1,B1R2,Y2,B2 D

C-2

CB PB50 ZT

4RLRC1/RBR3

87R

64R

75A,B,L

Reactor TroubleAlarms & Trips

21R

99R

400KV ICT CB RELAY & PROTN PANEL

MFM

BAY3 BCU

4RTRA3

LBB/ BU50Z

CB TROUBLES& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

DC

-1

86 GR-B D

C-2

CB PB

InterTrip

Relays

96/50Z

4RTRB3

87T1

87T2

75A,B,L 75A,B

Transformer TroubleAlarms & Trips

67HV 67IV

99HV 99IV

MFM

LV BAY BCU

4RTRC3

LBB/ BU50Z

CB TROUBLES& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

DC

-1

86 GR-B D

C-2

CB PB

InterTrip

Relays

96/ 50Z

BAY2 BCU

4RTB2

A/R+SC79+25

LBB/ BU50Z

CB TROUBLES& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

186R1,Y1,B1R2,Y2,B2

DC

-1

86 GR-B

286R1,Y1,B1R2,Y2,B2 D

C-2

CB PB50 ZT

220KV FEEDER CB RELAY & PROTN PANEL

MFM

BAY1 BCU

2RLA1

A/R+SC79+25

LBB/ BU50Z

CB TROUBLES& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

186R1,Y1,B1R2,Y2,B2

DC

-1

86 GR-B

286R1,Y1,B1R2,Y2,B2 D

C-2

CB PBTTS

96 /50Z

2RLB1

21L1

21L2

D/T-1ReceiveRelays

D/T-2ReceiveRelays

75A75B

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

BC BCU

2RBC

LBB/ BU50Z

CB TROUBLES& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

DC

-1

86 GR-B D

C-2

CB PB

LBB/ BU50Z

50/51 A,BC,N

96 50Z

TBC BCU

2RTBC

LBB/ BU50Z

CB TROUBLES& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

186R1,Y1,B1R2,Y2,B2

DC

-1

86 GR-B

286R1,Y1,B1R2,Y2,B2 D

C-2

CB PB

96 50Z

A/R+SC79+25

BS BCU

2RBC

LBB/ BU50Z

CB TROUBLES& ALARMS

TRIP COIL1 & 2

HEALTHYLEDS

86 GR-A

DC

-1

86 GR-B D

C-2

CB PB

LBB/ BU50Z

50/51 A,BC,N

96 50Z

SUBSTATION AUXILIARIES & TERMINAL PANELS

AlarmUnit

Network PartnerSSLTA 88 SRS485M SREDU/MSRS485M

RS232 RS485 RS485SERVICE

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

Ethernet Switch

Base System

ABB Network Partner AG

CE

COM581

CommunicationGateway

AlarmUnit

Network PartnerSSLTA 88 SRS485M SREDU/MSRS485M


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

Ethernet Switch

Hot Standby

Main Server Redunt Server

Line Printer forAlarm / Event Metering Values

DOT Matrix Printer


CE

COM581

Router toALDC/SLDC

BCU1 BCU2

BCU3 BCU4

BCU5 BCU6

BCU7 BCU8

BCU9 BCU10

SSAUX

For AC 415V

System-1

For AC 415V

System-2

For DC220V

System-1

For DC220V

System-2

For DC48V

System-1

For DC48V

System-2

For AirconditionSystem

For FireFightingSystem

For DieselGenerator

System

For fire& SmokeDetector


CE

COM581

Surveillancesystem

SUBSTATION AUTOMATION

Base System

ServiceModem

Network Partner SSLTA 88SRS485M SREDU/MSRS485M


1MRSC600291MRSC600281MRSC600281MRSC600281MRSC600281MRSC600281MRSC60028

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.

Network Partner SSLTA 88SRS485M SREDU/MSRS485M


1MRSC600291MRSC600281MRSC600281MRSC600281MRSC600281MRSC600281MRSC60028

AlarmUnit

AlarmUnit

Ethernet (TCP/IP)

Printer Server

Alarm/EventLine Printer

Aux

iliar

yA

larm

Ann

unci

atio

nBase System

DM PrinterFor 15 Min Metering &

Trends

HardcopyPrinter +

MFD

POWER

V1

OVP

LOCKACQR SATELLITE CONTROLLED CLOCKGPS 166

NORMAL OPERATIONWED 11.12.1996MEZ 11.42.25SV 24 > SYN

MENUCLRACK NEXT INC

MEINBERG

GPSMeinberg

? LOCAL

REMOTE

SET

OPERATION

M

M

M

? LOCAL

REMOTE

SET

OPERATION

M

M

M

? LOCAL

REMOTE

SET

OPERATION

M

M

M

? LOCAL

REMOTE

SET

OPERATION

M

M

M

? LOCAL

REMOTE

SET

OPERATION

M

M

M

? LOCAL

REMOTE

SET

OPERATION

M

M

M

12345678

910111213141516

CE

12345678

910111213141516

CE

12345678

910111213141516

CE

12345678

910111213141516

CE

12345678

910111213141516

CE

12345678

910111213141516

CE


CE

910111213141516

910111213141516

910111213141516

CE

ABB Network Partner AGREL511

CE


CE


910111213141516

910111213141516

910111213141516

910111213141516

910111213141516

910111213141516

RCC LDC

COMMUNICATION GATEWAY TORCC & ALDC

Engineering & DRwork Station

LAPTOP

OTH

AVR

HYDRANEM

EM

EM

EM

EM

EM

EM

EM

EM

DIGITALPLCC/OLTE

SYSTEM

CARRPROT

SYSTEM

CARRPROT

SYSTEM

CARRPROT

SYSTEM

CARRPROT

SYSTEM

CARRPROT

SYSTEM

CARRPROT

SYSTEM

2 Ports for RCC & 2 Ports for ALDC/SLDC

DIGITALPLCC/OLTE

SYSTEM

DIGITALPLCC/OLTE

SYSTEM

OTH

AVR

HYDRAN

OTH

AVR

HYDRAN

TRIP LOGICS OF


SCHEMEPREPARED BY


GROUP-A & GROUP-B TRIPPINGS

REACTOR PROTECTIONTRANSFORMER PROTECTIONLINE PROTECTIONGROUP-AREACTOR DIFFERENTIAL RELAYREACTOR BACKUP / 21R RELAYOIL TEMP HIGH TRIPPRESURE RELIEF TRIP GROUP-BREACTOR REF RELAYBUCHHOLZ TRIPWINDING TEMP HIGH TRIPLOW/ HIGH OIL LEVEL TRIPFIRE PROTECTION TRIP

GROUP-AT/F DIFFERENTIAL RELAYT/F HV BACKUP RELAYT/F IMP / 21T RELAYT/F HV OVERFLUX RELAYOIL TEMP HIGH TRIPPRESURE RELIEF TRIPTERITIARY DELTA WNDG NDR PROT GROUP-BT/F REF / HIGH Z DIFF RELAYBUCHHOLZ TRIPT/F LV BACKUP RELAYT/F NEUTRAL CURRENT / 51 O/C RLYT/F LV OVERFLUX RELAYOVER LOAD PROT (ALARM ONLY)OLTC BUCHHOLZ TRIPWINDING TEMP HIGH TRIPLOW/ HIGH OIL LEVEL TRIP

GROUP-AMAIN-1 PROTECTION M1 BUILT IN FUNCTIONSTEED-1 PROTECTIONOVER VOLTAGE STAGE-1 PROTDIRECT TRIP CHANNEL-1 RECEIVEDGROUP-BMAIN-2 PROTCTIONM2 BUILT IN FUNCTIONSTEED-2 PROTECTIONOVER VOLTAGE STAGE-2 PROTLBB/BFR RELAYDIRECT TRIP CHANNEL-2 RECEIVED

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 FOLLOWING1. PROTECTION2. CB CONTROL3. ISOLATOR / EARTH SWITCH CONTROL4. ANNUNCIATION / INDICATION

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

IN BUILT FUNCTIONS OF DISTANCE SCHEMESOTF, PSB

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

X

X

X

X

X3-PHBDIRECT TRIP CH-2 RECD

3-PHBM_CB BFR / LBB PROT

X3-PHA87T HZTEED PROT-1

X3-PHB87T LZTEED PROT-2

X3-PHADIRECT TRIP CH-1 RECD

X3-PHBSTUB, TOC, BOC,

TEF, DEF, (BUILT- IN 21M2)

X3-PHASTUB, TOC, BOC,

TEF, DEF, (BUILT- IN 21M1)

X3-PHB59 L1 & L2OVER VOLTAGE

STAGE-1 & STAGE-2 (BUILT – IN 21 M2)

3-PHBT_CB BFR / LBB PROT

X3-PHA59 L1 & L2OVER VOLTAGE

STAGE-1 & STAGE-2 (BUILT – IN 21 M1)

X1-PHB21 M2MAIN-2 PROTECTION

X1-PHA21 M1MAIN-1 PROTECTION

OU

TPUT

GR

OU

P

SYMB

OL

PROTECTION RELAY

INITIA

TE M_

CB 1P

H TRIP

UNIT

GR-A

INITIA

TE M_

CB 3P

H TRIP

UNIT

GR-A

INITIA

TE M_

CB 1P

H TRIP

UNIT

GR-B

INITIA

TE M_

CB 3P

H TRIP

UNIT

GR-B

INITIA

TE T_

CB 1P

H TRIP

UNIT

GR-A

INITIA

TE T_

CB 3P

H TRIP

UNIT

GR-A

INITIA

TE T_

CB 1P

H TRIP

UNIT

GR-B

INITIA

TE T_

CB 3P

H TRIP

UNIT

GR-B

STAR

T M_C

B A/R

RELA

Y

STAR

T T_C

B A/R

RELA

YBL

OCK

M_CB

A/R R

ELAY

BLOC

K T_

CB A/

R RELA

Y

MAIN-

1/MAIN

-2 CA

RRIER

SEND

INITIA

TE AL

ARM

INITIA

TE SC

ADA (

DR &

SOE)

DIREC

T TRIP

CARR

IER SE

ND

INITIA

TE 40

0KV B

/B PR

OT

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

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

3-PH96 BBTRIP SIGNAL FROM 400KV

BUSBAR PROTECTION

27 UVLINE UNDER VOLTAGE RELAY

X3-PHB86 GR B3-PH TRIP UNIT GR-B

1-PHB2861-PH TRIP UNIT GR-B

X3-PHA86 GR A3-PH TRIP UNIT GR-A

1-PHA1861-PH TRIP UNIT GR-A

X3-PHA&B25 SYNCSYNC CHECK RELAY

(BUILT IN 21M1 & 21M2)

X1-PH & 3-PHA&B79 A/R

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

OU

TPUT

GR

OU

P

SYMB

OL

PROTECTION RELAY

INITIA

TE T_

CB A/

R PRIO

RITY

CLOS

E MAIN

CB

TO SC

ADA (

DR &

SOE)

INITIA

TE M_

C B TR

IP CO

IL-1

INITIA

TE M_

C B TR

IP CO

IL-2

STAR

T LBB

/BFR

M_C

B

89LE

C LOS

E PER

MISS

ION

INITIA

TE AL

ARM

TIE CB TRIPPING LOGICS

XX1-PHB2861-PH TRIP UNIT GR-B

XXXX3-PHA86A3-PH TRIP UNIT GR-A

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

3-PHADIRECT TRIP CH-1 RECD

3-PHBDIRECT TRIP CH-2 RECD

X3-PH25SYNC CHECK RELAY

1-PHA1861-PH TRIP UNIT GR-A

X3-PHB86B3-PH TRIP UNIT GR-B

X1-PH

&3-PH

A&B

79 A/RAUTO RECLOSURE RELAY

X3-PHB50 ZM_CB BFR / LBB PROT

(152 CB & 352 CB)

X3-PHB50 ZTT_CB BFR / LBB PROT

OU

TPUT

GR

OU

P

SYMB

OL

PROTECTION RELAY

INITIA

TE M_

CB 1P

H TRIP

UNIT

GR-A

INITIA

TE M_

CB 3P

H TRIP

UNIT

GR-A

INITIA

TE M_

CB 1P

H TRIP

UNIT

GR-B

INITIA

TE M_

CB 3P

H TRIP

UNIT

GR-B

INITIA

TE T_

CB 1P

H TRIP

UNIT

GR-A

INITIA

TE T_

CB 3P

H TRIP

UNIT

GR-A

INITIA

TE T_

CB 1P

H TRIP

UNIT

GR-B

INITIA

TE T_

CB 3P

H TRIP

UNIT

GR-B

INITIA

TE AL

ARM

INITIA

TE SC

ADA (

DR &

SOE)

DIREC

T TRIP

CARR

IER SE

ND

INITIA

TE M_

CB 1P

H TRIP

UNIT

GR-A

INITIA

TE M_

CB 3P

H TRIP

UNIT

GR-A

INITIA

TE M_

CB 1P

H TRIP

UNIT

GR-B

INITIA

TE M_

CB 3P

H TRIP

UNIT

GR-B

152 252

152 152152 252

252

252 352

352

352

352

INITIA

TE T_

CB TR

IPCOIL

-1 & CO

IL-2

STAR

T LBB

/BFR

OF T_

CB

252

252

CLOS

E T_C

B25

2

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

XXXXXX3-PHB50ZTT_CB BFR / LBB PROT

XXXXXXX3-PHB50ZLV_CB BFR / LBB PROT

XXXXXX3-PHB99T LVLV OVER FLUX PROT

XXXXXX3-PHB67 ABCNLV BACKUP PROTECTION

XXXXX3-PH9687 BB400KV B/B PROT

XXXXXX3-PHB50ZM_CB BFR / LBB PROT

XXXXXX3-PHA99T HVHV OVER FLUX PROT

X

X

XXX

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

X

X

X

X

X

X

X3-PH9687 BB220KV B/B PROT

X3-PHA151NTERI NEUTRAL DISP PROT

X3-PHA50 STUBSTUB PROT

X3-PHA/B86 GR-A/BAT/F TROUBLE TRIP HV & LV

XAT/F TROUBLE ALRM

X3-PHA/B87T HZ/LZTEED PROT-1 / 2

X3-PHB64T(HZ)REF PROTECTION

X3-PHA/B86 GR-A/BHV PROT TRIP UNIT GR-A & B

X3-PHA/B86 GR-A/BLV PROT TRIP UNIT GR-A & B

X3-PHA51 O/LOVER LOAD RELAY

X3-PHA67 ABCNHV BACKUP PROTECTION

X3-PHA87T(LZ)DIFFERENTIAL RELAY

OU

TPUT

GR

OU

P

SYMB

OL

PROTECTION RELAY

INITIA

TE M_

CB 3P

H TRIP

UNIT

GR-A

INITIA

TE M_

CB 3P

H TRIP

UNIT

GR-B

INITIA

TE T_

CB 3P

H TRIP

UNIT

GR-A

INITIA

TE T_

CB 3P

H TRIP

UNIT

GR-B

INITIA

TE AL

ARM

INITIA

TE SC

ADA (

SOE)

INTER

TRIP

CIRCU

IT HV

& LV

INITIA

TE 40

0KV B

/B PR

OT

INITIA

TE LV

_CB 3

PH TR

IP UN

IT GR

-A

INITIA

TE LV

_CB 3

PH TR

IP UN

IT GR

-B

INITIA

TE M_

CB TR

IP CO

IL-1

INITIA

TE M_

CBTR

IP CO

IL-2

INITIA

TE 22

0KV B

/B PR

OT

STAR

T M_

CB LB

B/BF

R RELA

Y

STAR

T LV

_CB L

BB/B

FR RE

LAY

INITIA

TE LV

_CB T

RIP CO

IL-1

INITIA

TE LV

_CBT

RIP CO

IL-2

PROTECTION TRIP SCHEME

BUS-1 BUS-2

1-52CB 3-52CB2-52CB

86-AMTR/HSTR

ABBREL521MAIN-1

86-BMTR/HSTR

86-BMTR/HSTR

86-AMTR/HSTR

86-BMTR/HSTR

86-AMTR/HSTR



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

C

E


C

E

1

2345678

9

10111213141516


21 MAIN 1

21 MAIN 2

C

E


C

E

1

2345678

9

10111213141516


87 T LZ

87 T HZ

MAIN-1/ MAIN-2ZONE-1 & SINGLE PHASE FAULT

C

E

DISPLAY

ACTIVE START TRIP

REL 521

C

E

DISPLAY

ACTIVE START TRIP

REL 316

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

TO EVENT RECORDER ( SOE/ SCADA )

TO DISTURBANCE RECORDER

START MAIN CB AUTO RECLOSURE

START TIE CB AUTO RECLOSURE

CARRIER SEND

INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)

INITIATE ALARM (ANNUNCIATION COME)

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

CARRIER SEND



TO LBB/BFR INITIATION


AUTO RECLOSURECONDITIONS REQUIRED FOR A/R OPERATION

1. CB CLOSE CONDITION.2. TIME LAPSED MORE THAN RECLAIM TIME.3. OPERATING PRESSURE OF CB SUITABLE FOR AUTORECLOSURE

OPERATION.4. DC SUPPLY TO AUTORECLOSURE SHOULD BE AVAILABLE. 5. PREPARE 3-PH TRIP RELAY SHOULD BE RELEASED CONDITION.6. NO BLOCKING SIGNAL TO AUTORECLOSURE RELAY.7. POLE DISTURBANCE RELAY TIME SHOULD BE MORE THAN

TWICE OF DEAD TIME OF AUTO RECLOSURE.7. CARRIER FAIL SIGNAL SHOULD NOT COME AT BOTH ENDS.8. CARRIER SWITCH SHOULD BE IN SERVICE CONDITION.9. SINGLE PHASE & ZONE-1 FAULT ONLY.

AUTO RECLOSURE OPERATION1. TRIP MAIN CB SINGLE POLE.2. TRIP TIE CB SINGLE POLE.3. CLOSE MAIN CB AFTER DEAD TIME.4. IF A/R SUCCESS FOR MAIN CB THEN AFTER SUPPLEMENTARY TIME

DELAY CLOSE TIE CB.(NORMALLY SUPPLEMENTARY TIME DELAY IS DEAD TIME)

5. IF A/R UNSUCCESS THEN TRIP MAIN & TIE CBs.6. IF MAIN CB OPEN CONDITION, THEN NO SUPPLEMENTARY DELAY TIME

FOR TIE A/R. IT WILL OPERATE ITs OWN DEAD TIME.

MAIN-1/ MAIN-2ZONE-1 & TWO / THREE PHASE FAULT

C

E

DISPLAY

ACTIVE START TRIP

REL 521

C

E

DISPLAY

ACTIVE START TRIP

REL 316

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

CARRIER SEND



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 )





CARRIER SEND





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

C

E

DISPLAY

ACTIVE START TRIP

REL 521

C

E

DISPLAY

ACTIVE START TRIP

REL 316







INITIATE ALARM (ANNUNCIATION CAME)






CARRIER SEND ( IF PUTT OR2 SCHEME SELECTED )



CARRIER SIGNAL RECEIVED & ZONE-2 STARTER IS PICKUP CONDITION

CARRIER SIGNAL RECEIVED & ZONE-2 STARTER IS PICKUP CONDITION



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

C

E

DISPLAY

ACTIVE START TRIP

REL 521

C

E

DISPLAY

ACTIVE START TRIP

REL 316







INITIATE ALARM (ANNUNCIATION CAME)










DISTANCE SCHEME TRIPPING OUTPUTS

C

E

DISPLAY

ACTIVE START TRIP

REL 521

C

E

DISPLAY

ACTIVE START TRIP

REL 316

MAIN CB TIE CBCO CO

186 R

186 Y

186 B

TO TRIP COIL-1TO TRIP COIL-2



186 R

186 Y

186 B




CO286 R

286 Y

286 B




CO286 R

286 Y

286 B




MAIN LBB

C

E

DISPLAY

ACTIVE START TRIP

RAICA

C

E

DISPLAY

ACTIVE START TRIP

RAICA

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

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



BLOCK MAIN CB & TIE CB AUTO RECLOSURE



INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT (TRIP BAY1 CB 3-POLES ) INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT ( TRIP BAY3 CB 3-POLES )


TO DISTURBANCE RECORDER (BAY1 & BAY3)

BLOCK MAIN CB OF BAY1 & BAY3 AUTO RECLOSURE



CLOSE INTERLOCK OF MAIN CB & TIE CB

CLOSE INTERLOCK OF TIE CB


CLOSE INTERLOCK OF MAIN CB OF BAY1 & BAY 3

DIRECT TRANSFER TRIP-1 CARRIER SEND TO OTHER END


INITIATION1-PH TRIP RELAYS OFMAIN-1 PROTECTION

1-PH TRIP RELAYS OFMAIN-2 PROTECTION

86-GR-AMASTER TRIP RELAY

86-GR-BMASTER TRIP RELAY

96 BB BUSBAR RELAY

TIE LBBINITIATION

1-PH TRIP RELAYS OFMAIN-1 PROTECTION OF LINE-1(BAY1) &

LINE-2 (BAY3)

1-PH TRIP RELAYS OFMAIN-2 PROTECTIONOF LINE-1 (BAY1) &

LINE-2 (BAY 3)



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


BUS BAR PROTECTION

C

E

DISPLAY

ACTIVE START TRIP

REB 500

C

E

DISPLAY

ACTIVE START TRIP

REB 670

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


TO DISTURBANCE RECORDER OF MAIN-1

TO TRIP COIL-2 CONCERNED BAY CB

TO CLOSE CIRCUIT INTERLOCK OF CONCERN CB

DIRECT TRIP SEND CHANNEL-1 TO OTHER END





FROM LBB/BFR TO BUS BAR TRIPPING

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



TO TRIP COIL-2 CONCERNED BAY CB

TO CLOSE CIRCUIT INTERLOCK OF CONCERN CB






FROM LBB/BFR TO BUS BAR TRIPPING

STUB PROTECTION

C

E

DISPLAY

ACTIVE START TRIP

REL 521

C

E

DISPLAY

ACTIVE START TRIP

REL 316

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






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 )






LINE /AT/FISOLATOR

OPENS




CLOSE INTERLOCK OF MAIN CB



LINE /AT/FISOLATOR

OPENS

TEED PROTECTION

C

E

DISPLAY

ACTIVE START TRIP

RET 521

C

E

DISPLAY

ACTIVE START TRIP

RET 670



















87 T1(HZ)

87 T2(LZ)

MAIN-1/ MAIN-2OVER VOLTAGE STAGE-1

C

E

DISPLAY

ACTIVE START TRIP

REL 521

C

E

DISPLAY

ACTIVE START TRIP

REL 316

















110% OF V4 SECS FOR

FEEDER-15 SECS FOR FEEDER-2

110% OF V4 SECS FOR

FEEDER-15 SECS FOR FEEDER-2



OVER VOLTAGE STAGE-2

C

E

DISPLAY

ACTIVE START TRIP

REU 521

C

E

DISPLAY

ACTIVE START TRIP

REU 521



TO DISTURBANCE RECORDER (MAIN-1 & MAIN-2)






LINE EARTH SWITCH CLOSE PERMISSION ONLY.

120% OF V20m SECS

1O% OF V


UNDER VOLTAGE RELAY

CARRIER TRIPPING SCHEMES(TELEPROTECTION)

1. TO 86-A MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR MAIN CB.2. TO 86-A MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR TIE CB.

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

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

CHANNEL-1 RECEIVE

CHANNEL-2 RECEIVE

1. TO 86-B MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR MAIN CB.2. TO 86-B MASTER TRIP RELAY (HIGH SPEED TRIP RELAY) FOR TIE CB.

CHANNEL-2 SEND

HERE CHANNEL-1 & CHANNEL-2 SIGNALS ARE MAIN & ALTERNATE CHANNEL1. 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).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 TEED-1 PROTECTION OPERATED10. 87 TEED-2 PROTECTION OPERATED

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..

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

CHANNEL-1 SEND

DIRECT TRIPPINGPERMISSIVE TRIPPINGDETAILS

CARRIER TRIPPING SCHEMES(TELEPROTECTION)

C

E


C

E

1

2345678

9

10111213141516


C

E

1

2345678

9

10111213141516


C

E

ABB Network Partner AG REL531 CARRIERPROTECTION

PANEL-1PT SEND

PT RECEIVEPT SEND

PT RECEIVEDT SEND

DT RECEIVE

CARRIERPROTECTION

PANEL-2PT SEND

PT RECEIVEPT SEND

PT RECEIVEDT SEND

DT RECEIVE

CARRIERPROTECTION

PANEL-1PT SEND

PT RECEIVEPT SEND

PT RECEIVEDT SEND

DT RECEIVE

CARRIERPROTECTION

PANEL-2PT SEND

PT RECEIVEPT SEND

PT RECEIVEDT SEND

DT RECEIVE

DIRECT TRIP SEND CH-2

MAIN CB 86-B

TIE CB 86-B


MAIN CB 86-B

TIE CB 86-B


MAIN CB 86-A

TIE CB 86-A


MAIN CB 86-A

TIE CB 86-A ONE END OTHER END

21 M1 – REL 521 21 M1 – REL 521

21 M2REL 316

21 M2REL 316

PT : PERMISSIVE PROTECTION TRANSFER TRIPDT : DIRECT TRANSFER TRIP

DIRECT TRANSFER TRIP CHANNEL – 1 / 2 RECEIVED

C

E

DISPLAY

ACTIVE START TRIP

85 LO X1

C

E

DISPLAY

ACTIVE START TRIP

85 LO X2













DIRECT TRIP CHANNEL-1RECEIVED

DIRECT TRIPCHANNEL-2RECEIVED.







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

86-GBMASTER

TRIP /HIGH

SPEEDTRIP

RELAY

86-GAMASTER

TRIP /HIGH

SPEEDTRIP

RELAY

86-GBMASTER

TRIP /HIGH

SPEEDTRIP

RELAY

86-GAMASTER

TRIP /HIGH

SPEEDTRIP

RELAY

TRIP

CO

IL-2

M

AIN

CB

T

RIP

CO

IL -1

TRIP C

OIL-1 TIE C

B TR

IP CO

IL -2

OVER VOLTAGE STAGE-1(INBUILT MAIN-1)

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



SOTF PROTECTION (INBUILT MAIN-1)

SOTF PROTECTION ( IN BUILT MAIN-2 )

OVER VOLTAGE STAGE-2

DEF,TOC, BOC, STUB (INBUILT MAIN-1)

DEF, TOC, BOC, STUB ( IN BUILT MAIN-2 )

MAIN LBB OPERATED

TIE LBB OPERATED

TEED-1 PROTECTION

TEED-2 PROTECTION

MASTER TRIP RELAYS HIGH SPEED TRIP RELAYS

LOCKOUT RELAYS

86-GBMASTER

TRIP /HIGH

SPEEDTRIP

RELAY

86-GAMASTER

TRIP /HIGH

SPEEDTRIP

RELAY

PUSH BUTTON FOR RESETTING.TO CLOSING INTERLOCK OF CONCERNED BAY CBTO INITIATE LBB/BFR OF CONCERNED BAY



INITIATE FLAG RELAY (FLAG RELAY OPERATES)


BLOCK AUTO RECLOSURE OF CONCERNED BAY

TO TRIP COIL-1 CONCERNED BAY CBTO TRIP COIL-2 CONCERNED BAY CB

PUSH BUTTON FOR RESETTING.TO INITIATE LBB/BFR OF CONCERNED BAY



INITIATE FLAG RELAY (FLAG RELAY OPERATES)


BLOCK AUTO RECLOSURE OF CONCERNED BAY

TO TRIP COIL-1 CONCERNED BAY CBTO TRIP COIL-2 CONCERNED BAY CB

TO CLOSING INTERLOCK OF CONCERNED BAY CB

TRANSFORMER PROTECTION(DIFFERENCIAL & REF / 3-PH HZ DIFF PROTECTION)

C

E

DISPLAY

ACTIVE START TRIP

RET 670

C

E

DISPLAY

ACTIVE START TRIP

RET 521

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 )







87 T1(LZ)

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 )

64 T2REF(HZ)

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 )

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

C

E

DISPLAY

ACTIVE START TRIP

REF 610

C

E

DISPLAY

ACTIVE START TRIP

REX 521








67 HV ABCN


67 LVABCN



TRANSFORMER PROTECTION ( OVER FLUX PROTECTION FOR HV & LV)

C

E

DISPLAY

ACTIVE START TRIP

RALK

C

E

DISPLAY

ACTIVE START TRIP

RATUB








99T HV 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 )

99T LV



OVER VOLTAGE (LINE) AND OVER FLUX(TRANSFORMER ) PROTECTION TRIP SCHEME

BUS-1 BUS-2

1-52CB 3-52CB2-52CB

86-AMTR/HSTR

ABBREL521MAIN-1

86-BMTR/HSTR

86-BMTR/HSTR

86-AMTR/HSTR

86-BMTR/HSTR

86-AMTR/HSTR

ABBO/V – 1O/V – 2

ABBO/V – 1O/V – 2

ABBRALK

O/F- HV

ABBRATUBO/F- LV



(BAY 1&2)

(BAY 1&2)

(BAY 2&3 / HV)

(BAY LV)

LV - CB86-BMTR/HSTR

86-AMTR/HSTR

TRIP COIL-2 TRIP COIL-1

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.

TRANSFORMER PROTECTION

C

E

DISPLAY

ACTIVE START TRIP

RXIG 21

C

E

DISPLAY

ACTIVE START TRIP

RAEDK1








51 O/L 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 )

NDR



MAIN LBB

C

E

DISPLAY

ACTIVE START TRIP

RAICA

C

E

DISPLAY

ACTIVE START TRIP

RAICA

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

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 ) INITIATE MAIN CB 86-GR-B 3-PH TRIP UNIT ( TRIP BAY3 CB 3-POLES )


TO DISTURBANCE RECORDER (BAY1)

BLOCK MAIN CB OF BAY1 AUTO RECLOSURE






CLOSE INTERLOCK OF MAIN CB OF BAY1 & BAY 3

INTER TRIP TO 220KV LV MAIN CB

INTER TRIP TO 220KV LV TBC CB

INITIATION86-GR-A

MASTER TRIP RELAY


96 BB BUSBAR RELAY

TIE LBBINITIATION


OF LINE-1(BAY1)


OF LINE-1 (BAY1)





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

86-GBMASTER

TRIP /HIGH

SPEEDTRIP

RELAY

86-GAMASTER

TRIP /HIGH

SPEEDTRIP

RELAY

86-GBMASTER

TRIP /HIGH

SPEEDTRIP

RELAY

86-GAMASTER

TRIP /HIGH

SPEEDTRIP

RELAY

TRIP

CO

IL-2

M

AIN

CB

T

RIP

CO

IL -1

TRIP C

OIL-1 TIE C

B TR

IP CO

IL -2

T/F DIFFERENTIAL RELAY87 T

RESTRICTED EARTH FAULTRELAY 64 REF/T

B/U O/C & E/F PROTN RLY67 ABCN

INTER TRIP FROM LV SIDE

INTER TRIP FROM LV SIDE

ICT TROUBLES GR-BPROTECTION TRIP

STUB RELAY 50ST

ICT TROUBLES GR-A PROTECTION TRIP

MAIN LBB OPERATED

TIE LBB OPERATED

ICT HV OVER FLUX RELAY

ICT LV OVER FLUX RELAY

INTER TRIP FROM TBC LBB& MANUAL TRIP OF 220KV

AUTO TRANSFORMER INTER TRIP CIRCUITSLV INTER TRIP CIRCUIT(TO HV)HV INTER TRIP CIRCUITS(TO LV)

FOR LV MASTER TRIP RELAY 86 GR-A1. 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 OPERATED8. 87 TEED-2 PROTECTION OPERATED.FOR LV MASTER TRIP RELAY 86 GR-B1. 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 OPERATED8. 87 TEED-2 PROTECTION OPERATED.

FOR HV M-CB MASTER TRIP RELAY 86 GR-A1. 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-B1. 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-A1. 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-B1. 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

OIL TEMP TRIP

BUCHHOLZ TRIP

PRD-1 TRIP

PRD-2 TRIP

DIFF RELAY 87T

OL RELAY 51OL

HV O/L+E/F PROT 67

86 AX

86 AY

TO 3PH GR-A 400KV MAIN CB

TO 3PH GR-A 400KV TIE CB

TO 3PH GR-A 220KV MAIN CB

TO 3PH GR-A 220KV TBC CB

NDR RELAY 151N

HV O/F RELAY 99T

TRANSFORMER TROUBLES TRIPPING GR-B

REF RELAY 64REF

STUB RELAY 50ST

LV O/L+E/F PROT 67

86 BX

86 BY

TO 3PH GR-B 400KV MAIN CB

TO 3PH GR-B 400KV TIE CB

TO 3PH GR-B 220KV MAIN CB

TO 3PH GR-B 220KV TBC CB

LV O/F RELAY 99T

OLTC BUCHHOLZ-R TRIP

OLTC BUCHHOLZ-Y TRIP

OLTC BUCHHOLZ –B TRIP

WNDG TEMP-HV TRIP

WNDG TEMP-LV TRIP

WNDG TEMP-IV TRIP

.

.

186R1

186R2

286R1

286R2

86GR-A

86GR-B

96BB

.

.

186Y1

186Y2

286Y1

286Y2

186B1

186B2

286B1

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

TRIP COIL-1

TRIP COIL-1 CIRCUITS

.

.

186R1

186R2

286R1

286R2

86GR-A

86GR-B

96BB

.

.

186Y1

186Y2

286Y1

286Y2

186B1

186B2

286B1

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

TRIP COIL-2

TRIP COIL – 2 CIRCUITS

ISOLATOR INTERLOCKS INTERLOCKS REQUIRED FOR CONCERNED ISOLATOR / EARTH SWITCH OPEN OR CLOSE

BAY - 2

BAY - 3

O152 CBO189 EO189 AEOBB189 EISO1 - 891BAY - 1

EQUIPMENT-4EQUIPMENT-3EQUIPMENT-2EQUIPMENT-1ISOLATOROPEN/CLOSES.NO

------O189O189 AES1 – 89 AE4---O152 CBO189 EO189 AEISO1 – 89 A3------O189O189 AES1 – 89 E2

------AUV RELAYO189 LES1 – 89 LE6---O252 CBO152 CBO189 LEISO1 – 89 L5

------O289 AO289 BES2 – 89 AE8---O252 CBO289 AEO289 BEISO2 – 89 A7

------O289 AO289 BES2 – 89 BE10---O252 CBO289 AEO289 BEISO2 – 89 B9

O352 CBO389 EO389 AEOBB289 EISO3 – 89 11------O389O389 AES3 – 89 E12---O352 CBO389 EO389 AEISO3 – 89 A13------O389O389 AES3 – 89 AE14

------OLV89 TO389 TES3 – 89 TE16O352 CBO252 CBO389 TEOLV89 E2ISO3 – 89 T15

NOTE: All Earth Switches in the Bay are towards Circuit Breaker side only. The Line and Transformer Earth Switches are towards Line & Transformer.

O: OPENC: CLOSEA: ACTED

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

ISOLATOR & CB INTERLOCKS

1-52CB&

OPENOPEN

OPEN

OPERATION1-89LE

2-52CB

1-89L

1-52CB

&OPENOPEN

OPENOPERATION1-89AE

1-89E

1-89A

&BB189E OPEN

OPEN1-89AE

1-89E OPENOPEN

1-89OPERATION

1-52CB

&1-89 OPENOPEN

1-89A1-89EOPERATION

2-52CB&

OPENOPEN

OPENOPERATION2-89AE

2-89BE2-89A

OPEN

&1-89OPEN

1-89A1-89AEOPERATION

&1-89L OPENACTED

U/V RLY1-89LEOPERATION

&OPERATION

OPENOPEN

OPENOPEN

BB289E

3-89AE

3-89E3-52CB

3-89

3-52CB

3-89AE&

OPENOPEN

OPEN3-89E

OPERATION3-89A

2-52CB&

OPENOPEN

OPEN

3-52CB

3-89TEOPERATION3-89T

OPEN LV89E2

OPENOPEN& 3-89

3-89AOPERATION3-89E

OPENOPEN& 3-89

3-89AOPERATION3-89AE

OPENOPEN&OPERATION3-89TE

3-89T

LV89T

OPEN &OPEN2-89A

2-89BOPERATION

2-89AEOPENOPEN &2-89A

2-89BOPERATION

2-89BE

2-52CB&

OPENOPEN

OPENOPERATION2-89AE

2-89BE2-89B

CLOSE &CLOSE1-89E

1-89AE

LOCAL CLOSE

1-52CB

CLOSE &CLOSE2-89AE

2-89BE

LOCAL CLOSE

2-52CB

CLOSE &CLOSE3-89E

3-89AE

LOCAL CLOSE

3-52CB

RESET &RESET86GR-A

86GR-BREMOTE CLOSE

1-52CBRESET96BB

RESET &RESET

86GR-A86GR-B

REMOTE CLOSE

2-52CB

RESET &RESET86GR-A

86GR-BREMOTE CLOSE

3-52CBRESET96BB

CLOSING INTERLOCK OF MAIN & TIE CB86 GR-A 96 BB 86 GR-B

T N C

+ VE

CB REMOTE CLOSE

MAIN CB21M1 AR

21M2 AR

86 GR-A 86 GR-B

T N C

+ VE

TIE CBTIE AR

CB REMOTE CLOSE

CB AUTO RECLOSE

CB AUTO RECLOSE

+ve -ve

SYN SOCKET

+ve -ve

SYN SOCKET

ADVANTAGES & DISADVANTAGES OF ONE & HALF BREAKER SYSTEM A. ADVANTAGES:1. THREE CIRCUIT BREAKERS IN A FULL DIA ARE ALWAYS IN CLOSED POSITION.2. 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. 3. IF TIE CB PROBLEM / FOR PERIODICAL MAINTANENCE, DURING THAT PERIOD THE FEEDER IS

FEEDING FROM MAIN CB & CONNECTED BUS.4. 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)

5. 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.

6. 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.

7. IN THIS BUSBAR PROTECTION IS SIMPLE AND NEED NOT REQUIRE SELECTION OF ISOLATOR.8. IT IS MORE RELIABLE SYSTEM FOR OPERATION & MAINTANENCE POINT OF VIEW.B. DISADVANTAGES1. CT CONNECTIONS & PROTECTION TRIP LOGICS ARE SOME WHAT COMPLICATED. COMPLEX

CONTROL & PROTECTION PHILOSOPHY2. COST TOWARDS CTs, CIRCUIT BREAKERS & PANELS ARE TO BE INCREASED DUE TO EXTRA BAY.

THE COST COMPARISION TABLE SHOWN IN NEXT PRESENTATION.3. THE OPERATIONS FOR OPERATOR POINT OF VIEW IS LITTLE BIT COMPLICATED WHEN COMPARED

TO CONVENTIONAL SYSTEM. 4. SPACE OCUPATION FOR BAY IS MORE i.e COST OF LAND IS INCREASE.

COST COMPARISION BETWEEN CONVENTIONAL SYSTEM & ONE AND HALF BREAKER SYSTEM FOR FEEDER

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).

150%20 KM100%30 KM8 KMCONTROL CABLES5.

30%2 Nos50%3 Nos1 NoBAY

MARSHALLING BOXES

4.

100%2 Sets100%4 Sets4 CT METHOD200%3 Sets125%5 Sets5 CT METHOD200%3 Sets200%6 Sets6 CT METHOD30%2 SETS30%3 SETSI SET

CONTROL & RELAY PANELS3.

% INCREASE IN COST

HALF DIA(FOR 1 FEEDER)

% INCREASEIN COST

FULL DIA(FOR 2 FEEDERS)

2 Sets

2 Nos

100%50%3 Sets3 CT METHOD

INCLUDES THE COST OF CT MARSHELLING BOXES.

1 Set

CURRENT TRANSFORMERS

2.

100%50%3 Nos1 NoCIRCUIT BREAKERS1.

ONE & HALF BREAKER SYSTEMCONVENTIONAL

SYSTEMEQUIPMENTS.No

OTHER INFORMATION REGARDING RELAYS AND

TESTING EQUIPMENT


ADE/MRT(PROTECTION)

ABB RELAYS

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

ABB Network Partner AG REL 316*4

CE


ABB Network Partner AG REL 521

C

ECE

ABB Network Partner AG REL 512ABB Relays

cE

AREVA RELAYS

P443

P437

P445

P442E-PAC

GE MULTILINRELAYS

F90 – 67/51G60 – GEN M60 – MOTOR

N90 – NETWORK

L60 – 87LL90 – 87L T60 – 87TD25 – BCU

B90 – 87BBC60 – BCU D60 – 21LD90 – 21L

SIEMENS RELAYS

IA =250.10 AIB =250.10 A IC =250.10 AVAB =400.0 KVVBC =400.0 KVVCA =400.0 KV

ESC ENT

ENABLEDTRIP TARGET

RESET

INSTTIMECOMMSOTFZONE 1ZONE 2ZONE 3ZONE 4

PH - APH - BPH - CGND5051

79 RESET79 LOCKOUT

SPTENABLED

MCENABLED

COMMENABLED

RECLOSEENABLED

ALTSETTINGS

CBCLOSED

RELAYTEST

CBOPEN

SEL- 421PROTECTIONAUTOMATIONCONTROL

SEL

ENABLEDTRIP TARGET

RESET

INST TIME COMM SOTF SEL- 321- 5 - 2PROTECTIONAUTOMATIONCONTROL

SEL

TRIP

1 2 3 4

ZONE

EN A B C G Q 51 50

FAULT TYPE O/C

TARGETRESET

TARGET FAULT SET METER STATUS OTHER GROUP

NO /CANCEL

YES /SELECT

EXIT

SEL RELAYS

VA TECH REYROLLE RELAYS

ERL PHASE RELAYS

RELAY HARDWARE

NORMALLY 400KV RELAYS SUPPLIED WITH FOLLOWING CONFIGUARATION/HARDWARE

1. MIN 4Nos MAX 8Nos COMMAND/TRIP OUTPUTS 2. MIN 24Nos SIGNAL OUTPUTS3. MIN 14 LED INDICATIONS4. MIN 24 BINARY INPUTS

PCMODEM

IRIG-BRE/CC

16 / 32 BIT

RELAY SIGNAL DATA FLOW

FUNCTIONS AVAILABLE NUMERICAL DISTANCE RELAYS1. 4 TO 6 SETTING IMPEDENCE ZONES WITH 4 TO 6 SETTING GROUPS (21 + 21N).2. DIR / INST / TIME OVERCURRENT & EARTH FAULT FUNCTION( 50 / 51 / 67 P+G).3. EIGHT COMMUNICATION SCHEMES.4. SWITCH ON TO FAULT PROTECTION(21 SOTF).5. PHASE SELECTION(R,Y,B).6. POWER SWING BLOCKING(PSB)(68 + 68T).7. FUSE FAILURE SUPERVISION(PT FFR).8. AUTO RECLOSER WITH CHECK SYNCHRNISATION & VOLTAGE CHECK(79 + 25 +86). 9. WEEK END INFEED LOGIC(27 WI).10. SYSTEM SUPERVISION.11. STUB PROTECTION(STUB).12. OVER VOLTAGE/ UNDER VOLTAGE FUNCTION(27+ 59).13. LBB/BFR FUNCTION(50 BF).14. DISTANCE TO FAULT LOCATOR(21 FL).(SHOWS IN 1. %, 2. KM 3. MILES & 4. R+JX )15. 16 PROGRAMABLE SIGNALLING RELAYS WITH LEDs.16. RECORDABLE 10Nos LATEST DISTRUBANCES WITH BASIC EVALUATION

DISTURBANCE RECORDER.17. EVENT RECORDER RELATED TO RELAY EVENTS.18. PRE-FAULT, FAULT & POST-FAULT VALUES OF ANALOG POINTS WITH IMPEDENCE

DETAILS.19. USER CAN BE CONFIGUARED PROGRAMABLE LOGIC FUNCTIONS.20. TELE / CARRIER INTER TRIPPING SCHEMES(85 +21)(PUTT, POTT).21. TRIP CIRCUIT MONITORING(74 TC).22. METERING FUNCTION (INSTANTANEOUS VALUES DISPLAY FUNCTION).23. 4 QUADRANT ENERGY METER FUNCTION (KWH,KVAH,KVARH)(KYZ PULSE OUTPUT).24. MINIMUM 8 COMMOND/ TRIP RELAYS, 24 SIGNAL RELAYS25. 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

F-PROT-PROLENS/ TOMAT0L-PROQUAD/

MHOL-PRONXT PHASE

ARGUSDUOBIAS MQUAD/ MHO

OHMEGA 311/308

QUAD/ MHOOHMEGA 402VA TECH

REYROLL

THR 4 PE 16 THR 3 PE 18

L-60/L-90D-30

SEL 321 SEL 311C

SIPROTEC7SA522

MICOM P437E-PAC 3000,

OPTIMHO

REL 316REL 512

MAIN-2

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

7UT 613/ 2 7UT 513/ 2

QUAD/ MHO

QUAD/ MHO

SIPROTEC7SA62/3

SIEMENS ( SIPROTEC )

SEL 351SEL 387QUAD/ MHO

QUAD/ MHOSEL 421SEL

MIT---MHOMHOTHR 4 PE 24EASUN REYROLL

QUAD/ MHO

QUAD/ MHO

QUAD

CURVES

F-60 SR 750/60

T-35 / T-60 SR 7465

QUAD/ MHO

D-60, ALPS

GE MULTILIN

MICOM P141 MICOM P127

MICOM P633 KBCH/ MBCH

QUAD/ MHO

MICOM P443/P444/P442/P445

AREVA (ALSTOM)

REL 505 REX 521

RET 521 / 670RET 316

QUAD/BULLET

REL 521 REL 670ABB

DIR O/L,E/FDIFFERENTIALCURVESMAIN-1MANUFACTURERS

T/F PROTECTIONTRANSMISSION LINE PROTECTION

IEC 61850 RELAY MODELS OF DIFFERENT MANUFACTURERS

B 90, B 30T 60 L 60, L 90D 60, D 90F 60D 25GE MULTILIN

SIPROTEC 7 SS 52

SIPROTEC7UT 633/13/2

SIPROTEC7SD 522/61_

SIPROTEC7SA 522/6..

SIPROTEC7SJ 62/3/4

SIPROTEC6MD66/3

SIEMENS ( SIPROTEC )

SEL 487B

SEL 487E

SEL 387L

SEL 421/321

SEL 451

SEL 451-4SEL

GRB 100/150GRT 100GRL

100 / 150GRZ 100GRD 140GRD 150TOSHIBA

MICOM P44 2/3/4

REL 670

DISTANCE21

MICOMP141

REX 610

FEEDER67

MICOM P543/547

RED 670

LINE DIFFERENTIAL

87 L

MICOM C264

REC 670

BCUCB CONTROL

MICOM P633/P643

RET 670

DIFFERENTIAL87 T

MICOM P74 1/3/6AREVA

REB 670REB 500ABB

BUSBAR87 BBMANUFACTURERS

RELAY TESTING EQUIPMENTS1. PROGRAMA_GE (MODEL: FREEJA-300) 2. MANTA TEST SYSTEMS (MODEL: MTS 4000)3. OMICRON (MODEL: CMC 256-6) 4. DOBLE ( MODEL: F 6150)

RELAY TESTING EQUIPMENTS1. MEEGER_AVO (MODEL: MPRT 8430) 2. RES (MODEL: APTS 3)3. KOCOS (MODEL: ARTES 440 II) 4. EURO SMC ( MODEL: TRES)

400KV SUBSTATIONS IN APTRANSCO

2. MALKARAM 1&21. VTPS 1&22 X 315 MVASURYAPETA** (NALGONDA)13.

1. SRISAILAM 1&22. NUNNA 1&2 (VTPS*)

1. GAJWEL 1&2

1. RAMAGUNDAM3. VTPS**1&2

1. RAMAGUNDAM3. BTPS 1&2**

1. RAMAGUNDAM

1. CHENNAI RED HILLS3. KRISHNAPATNAM**1&2

1. TALLAPALLY

1. KALAPAKA 1&22. GAJUWAKA 1&2 (PGCIL)3. NUNNA 1&2 (PGCIL)4. NUNNA 3&4 (NRPT** 1&2)

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

1. SRISAILAM2. GHANAPUR (PGCIL)

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

2. MAMIDIPALLY 1&23 X 315 MVAYEDDUMAILARAM** (RR, SHANKARPALLY)11.3. VEMAGIRI 1&22 X 315 MVANARASARAOPETA**(GUNTUR)12.

2. GHANAPUR2 X 315 MVAMALKARAM* (SECUNDRABAD)10.

2. GHANAPUR4. YEDDUMAILARAM 1&2**2 X 315 MVAGAJWEL (MEDAK)9.

2 X 315 MVADICHPALLY (NIZAMABAD)8.

2 X 315 MVANELLORE(MANUBOLU)7.

2. KADAPA(1 + 1**) X 315 MVACHITTOR(VEPANJIR)6.

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

2 X 315 MVAVEMAGIRI (RAJHAMUNDRY)4.

2. RAICHUR(1 + 2**) X 315 MVAVELTUR (MB NAGAR)5.

3. KHAMMAM 1&2 (PGCIL)4. VEMAGIRI 1&22 X 315 MVAKALAPAKA (VISHAKHAPATNAM)3.

3. GOOTY (PGCIL)4. KURNOOL**(PGCIL765)(2 + 1**) X

315 MVANURNOOR (KURNOOL)2.

3. KHAMMAM 1&2(PGCIL)4. YEDDUMAILARAM 1&2**3 X 315 MVAMAMIDIPALLY (HYDERABAD)1.

FEEDERSCAPACITY400KV SUBSTATIONS.No

400KV SUBSTATIONS OF PGCIL IN AP

4. TALLAPALLY 1&25. DICHPALLY6. KHAMMAM (WRNGL)7. CHANDRAPUR 1&2

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

2 X 200 MVA 2 X 250 MVA1 X 315 MVA

RAMAGUNDAM(NTPC)1.

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.

1. RAMAGUNDAM2. KHAMMAM

1. NUNNA 1&2

1. TALLAPALLY 1&2 2. SOMANAHALLY

1. TALLAPALLY2. SOMANAHALLY3. KURNOOL

1. RAMAGUNDAM (WGL) 2. NUNNA5. KTPS**1&2

1. RAMAGUNDAM 1&2 2. GHANAPUR3. MAHABOOBNAGAR

1. GAJUWAKA2. SRISAILAM 1&2 (VTPS)3. VEMAGIRI 1&2

1. NUNNA2. KALAPAKA1&25. SIMHADRI**1&2

1. RAMAGUNDAM 1&2 2. MAMIDIPALLY3. GAJWEL(RMGNDM3)

3. BTPS(KTPS)* 1&22 X 315 MVAMULUGU* (WARANGAL)10.

2. ALAMATHI 1&2 (NLR765**)NELLORE(MANUBOLU)9.

3. KOLAR4. CHITTOR2 X 315 MVACHINAKAMPALLY8.

4. NEELAMANGALA5. RAICHUR 1&22 X 315 MVAGOOTY7.

4. GOOTY(KNL765*)5. CHINAKAMPALLY 1&23 X 315 MVATALLAPALLY

(NAGARJUNA SAGAR)5.4. MAMIDIPALLY 1&25. KALAPAKA 1&22 X 315 MVABUDIDAMPADU (KHAMMAM)6.

4. VEMAGIRI 3&4 (#)5. KHAMMAM6. NELLORE 1&27. KONDAPALLY*1&2

2 X315 MVANUNNA (VIJAYAWADA)4.

3. VEMAGIRI 1&2 4. JAIPUR(HVDC)2 X315 MVAGAJUWAKA (VISHAKHAPATNAM)3.

4. NAGARJUNA SAGAR5. KURNOOL6. MALKARAM (RMGNDM4)

3 X 315 MVAGHANAPUR (HYDERABAD)2.

FEEDERSCAPACITY400KV SUBSTATIONS.No

400KV NETWORK IN APSIMHADRI

KALAPAKA

GAJUWAKA

VEMAGIRI

NUNNA

NEL

LOR

E

IPP2

IPP3 IPP4

IPP1

MAMIDIPALLY

SRISAILAM

GUNTUR(NRPT)

KHAMMAM

GHANAPUR

GA

JWEL

TALLAPALLY

RAICHUR

MB

NG

R

NLR**765ALAMETHI/ CHENNAI

DICHPALLY

GOOTY

BA

NG

ALO

RE

KADAPAKURNOOL

WA

RA

NG

AL

KO

LAR

CH

ENN

AI

CHITTOR

RAMAGUNDAM

BA

NG

ALO

RE

MA

LKA

RA

M

YED

DU

MA

ILA

RA

M

VTPS

BTPS

CHANDRAPUR(MAHARASTRA)

HVDC

JAIPUR

KTPS

MALKARAM

SUR

YAPE

TA

KPPTSKRNL765

KPPTS

KR

NL

765

VEMAGIRI SUBSTATION DISPLAYNUNNA – I

(PGCIL)NUNNA – II

(PGCIL)GAJUWAKA – I

(PGCIL)GAJUWAKA – II

(PGCIL)

GUNTUR – I GUNTUR – II

KALAPAKA – I KALAPAKA – II GOWTHAMI – I GOWTHAMI – II FUTURE – I PHES

FUTURE – IIPHES

VPGCL – IGMR VASAVI

VPGCL – IIGMR VASAVI

KOPCL – IKONASEEMA

KOPCL – IIKONASEEMA

GVK EXT – I GVK EXT – II 315MVA,

400/220KVAUTO

TRANSFORMER-I

315MVA, 400/220KV

AUTO TRANSFORMER-II

DISPLAY

gk presentation

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