400KV PROTECTIONPREPARED BY
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
[email protected], Mobile:9440336984
BASICS OF
ONE AND HALF CIRCUIT BREAKER
SCHEMEPREPARED BY
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
ONE & HALF BREAKER DESCRIPTIONBUS-1
BUS-2
BUS-1 BUS-2
1. IN THIS TWO BUSES ARE PRIOVIDED.
ONE & HALF BREAKER DESCRIPTIONBUS-1
BUS-2
BUS-1 BUS-2
2. THESE TWO BUSES ARE INTER-CONNECTED BY THREE CIRCUIT BREAKERS.
ONE & HALF BREAKER DESCRIPTIONBUS-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
3. THEY ARE DESIGNATED AS 1-52 CB, 2-52 CB, 3-52 CB.
ONE & HALF BREAKER DESCRIPTIONBUS-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
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.
ONE & HALF BREAKER DESCRIPTIONBUS-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
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
ONE & HALF BREAKER DESCRIPTIONBUS-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
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.
ONE & HALF BREAKER DESCRIPTIONBUS-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
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.
ONE & HALF BREAKER DESCRIPTIONBUS-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
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.
ONE & HALF BREAKER DESCRIPTIONBUS-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
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
ONE & HALF BREAKER DESCRIPTIONBUS-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.
ONE & HALF BREAKER DESCRIPTIONBUS-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
TIE
BA
Y (2
ND
BA
Y ) F
OR
FEE
DER
-1 &
2
TIE BAY (2ND BAY ) FOR FEEDER-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
ONE & HALF BREAKER DESCRIPTIONBUS-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
TIE
BA
Y (2
ND
BA
Y ) F
OR
FEE
DER
-1 &
2
TIE BAY (2ND BAY ) FOR FEEDER-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)
ONE & HALF BREAKER DESCRIPTIONBUS-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
TIE
BA
Y (2
ND
BA
Y ) F
OR
FEE
DER
-1 &
2
TIE BAY (2ND BAY ) FOR FEEDER-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
FEEDER1 FEEDER3 FEEDER5 FEEDER7 FEEDER9 FEEDER11
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
FEEDER3 FEEDER4 FEEDER7 FEEDER8 FEEDER11 FEEDER12
FEEDER1 FEEDER2 FEEDER5 FEEDER6 FEEDER9 FEEDER10
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
ONE AND HALF CIRCUIT BREAKER
SCHEMEPREPARED BY
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
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)
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-ACT
3
P1P2
2-BCT
3P1 P2
(4CT METHOD)
ONE & HALF BREAKER SYSTEM
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)
ONE & HALF BREAKER SYSTEM
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)
ONE & HALF BREAKER SYSTEM
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)
ONE & HALF BREAKER SYSTEM
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)
ONE & HALF BREAKER SYSTEM
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
CURRENT TRANSFORMERCONNECTIONS IN 4CT METHOD
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
2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND
CONNECTED TO MAIN-2 PROTECTION
AFTER LBB/BFR
CORE-4 (PS)
2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND
CONNECTED TO PANEL METERS & ENERGY METER
2CT’s SECONDARIES ARE CONNECTED IN PARALLEL AND
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
TEED PROT-1(BAY 1&2)
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).
TEED PROT-2(BAY 2&3)
AFTERLBB/BFR
(3-52)
BACKUPPROTECTION
TEED PROT-2(BAY 1&2)
AFTERLBB/BFR
(2-52)
MAIN-2PROTECTION
TEED PROT-2(BAY 1&2)
AFTERLBB/BFR
(1-52)
CORE-4 (PS)
SPAREMETERING &ENERGY METER
SPAREMETERING &ENERGY METER
SPARECORE-3 (0.5/0.2)
BUSBAR-2 CHECKUP
PROTECTION (SPARE)
TEED PROT-2(BAY 2&3)
TEED PROT-2(BAY 2&3)
TEED PROT-2(BAY 1&2)
BUSBAR-1 CHECKUP
PROTECTION (SPARE)
CORE-2 (PS)
BUSBAR-2PROTECTION
TEED PROT-1(BAY 2&3)
TEED PROT-1(BAY 2&3)
TEED PROT-1(BAY 1&2)
BUSBAR-1PROTECTIONCORE-1
(PS)
3-CT3-TCT2-CT1-LCT1-CT
CURRENT TRANSFORMERCONNECTIONS IN 6CT METHOD
(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
PARALLEL AND CONNECTED TO
PANEL METERS & ENERGY METER
SPARECORE-3 (0.5/0.2)
BUSBAR-2 CHECKUP PROTECTION
(SPARE)
2CT’s SECONDARIES ARE CONNECTED IN
PARALLEL AND CONNECTED TO
BACKUP PROTECTION AFTER LBB/BFR
2CT’s SECONDARIES ARE CONNECTED IN
PARALLEL AND CONNECTED TO
MAIN-2 PROTECTION AFTER LBB/BFR
BUSBAR-1 CHECKUP PROTECTION
(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
CURRENT TRANSFORMERCONNECTIONS IN 6CT METHOD
TEED PROT-1(BAY 1&2)
TEED PROT-2(BAY 1&2)
AFTER LBB/BFR(2-52)
SPARE
SPARE
SPARE
2B-CT
MAINPROTECTION
BACKUPPROTECTION
METERING &ENERGY METER
TEED PROT-2(BAY 2&3)
TEED PROT-1(BAY 2&3)
3T-CT
SPARESPAREMETERING &ENERGY METER
SPARECORE-3 (0.5/0.2)
TEED PROT-2(BAY 2&3) AFTER LBB/BFR
(3-52)
TEED PROT-2(BAY 2&3)
MAIN-2PROTECTION
TEED PROT-2(BAY 1&2)
AFTER LBB/BFR (1-52)
CORE-4 (PS)
TEED PROT-1(BAY 2&3)
TEED PROT-1(BAY 2&3)
MAIN-1PROTECTION
TEED PROT-1(BAY 1&2)
CORE-5 (PS)
BUSBAR-2 CHECKUPPROTECTION
(SPARE)
SPARETEED PROT-2(BAY 1&2)
BUSBAR-1 CHECKUP PROTECTION
(SPARE)
CORE-2 (PS)
BUSBAR-2PROTECTION
SPARETEED PROT-1(BAY 1&2)
BUSBAR-1PROTECTION
CORE-1 (PS)
3-CT2A-CT1L-CT1-CT
CURRENT TRANSFORMERCONNECTIONS IN 8CT METHOD
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)
TEED PROT-2(BAY 2&3)
TEED PROT-2(BAY 2&3)
TEED PROT-1(BAY 2&3)
TEED PROT-2(BAY 1&2)
LBB PROT(BAY-1)
BUSBAR-1 MAIN-2
PROTECTION
CORE-2 (PS)
TEED PROT-2(BAY 2&3)
TEED PROT-1(BAY 2&3)
BACKUPPROTECTION
TEED PROT-1(BAY 1&2)
TEED PROT-2(BAY 1&2)
MAIN-2PROTECTION
TEEDPROT-1(BAY 1&2)
TEED PROT-2(BAY 1&2)
CORE-3 (PS)
METERING &ENERGY METER
METERING &ENERGY METER
CORE-5 (0.5/0.2)
BUSBAR-2 MAIN-1
PROTECTION
LBB PROT(BAY-3)
TEED PROT-1(BAY 2&3)
LBB PROT(BAY-2)
LBB PROT(BAY-2)
TEED PROT-1(BAY 1&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
ONE AND HALF CIRCUIT BREAKER
SCHEMEPREPARED BY
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
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 .
ONE & HALF BREAKER ( 4 CT METHOD) WITH PROTECTION SCHEME87BB1
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
FOR TRANSFORMER PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .
ONE & HALF BREAKER ( 6 CT METHOD) WITH PROTECTION SCHEME87BB1
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
FOR TRANSFORMER PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .
ONE & HALF BREAKER ( 5 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
CVT VL2
CVT VL1
BF
87L 21M2 VL1
BUSBAR-1
BUSBAR-2
MAIN-1
MAIN-2
PROTECTION OF LINE2(OR TRANSFORMER, IF APPLICABLE)
21M1 VL1
VL1 / VBB1
VL2 / VBB2
87 TD1 HZ
87 TD2 LZ
87 TD1 HZ
87 TD2 LZ
.
.
FOR TRANSFORMER PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .
ONE & HALF BREAKER ( 6 CT METHOD) WITH PROTECTION SCHEME87BB1
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
PROTECTION OF LINE2(OR TRANSFORMER, IF APPLICABLE)
21M1 VL1
79
25VL1 / VBB1
VL2 / VBB2
87 TD1 HZ
87 TD2 LZ
87 TD1 HZ
87 TD2 LZ
.
.
FOR TRANSFORMER PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .
ONE & HALF BREAKER ( 6 CT METHOD) WITH PROTECTION SCHEME87BB1
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
PROTECTION OF LINE2(OR TRANSFORMER, IF APPLICABLE)
21M1 VL1
79
25VL1 / VBB1
VL2 / VBB2
87 TD1 HZ
87 TD2 LZ
87 TD1 HZ
87 TD2 LZ
FOR TRANSFORMER PROTECTION & METERING VOLTAGE SELECTION RELAYS FOR BUS-1, BUS-2& LINE ARE PROVIDED .
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
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 .
(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
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
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
MAIN-1 PROTECTION FOR LINE (21L1)(5CT METHOD)
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
MAIN-2 PROTECTION FOR LINE (21L2)(5CT METHOD)
3 3 3
IR4 / C411IY4 / C431IB4 / C451
IN4 / C471
1-LCT
CORE-4CTR: 2000-1000-500/1A
CLASS: PS
4S4 4S4 4S4
4S24S2 4S2
P2P2P2 CT MBVR21 / E211VY21 / E231VB21 / E251VN21 / E271
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
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
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
2-52 CB LBB/BFR OPERATION
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)
3-52 CB LBB/BFR OPERATION
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
TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER
4-52 CB PANEL
TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER
7-52 CB PANEL
TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER
10-52CB PANEL
TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER
13-52 CB PANEL
TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER
16-52 CB PANEL
HIGH SPEEDTRIP RELAY
FOR 4-52 CB
HIGH SPEEDTRIP RELAY
FOR 7-52 CB
HIGH SPEEDTRIP RELAY
FOR 10-52 CB
HIGH SPEEDTRIP RELAY
FOR 13-52 CB
HIGH SPEEDTRIP RELAY
FOR 16-52 CB
1-52 CB PANELTRIP FROM 50 LBB
TO START 50 LBB
4-52 CB PANELTRIP FROM 50 LBB
TO START 50 LBB
7-52 CB PANELTRIP FROM 50 LBB
TO START 50 LBB
10-52 CB PANELTRIP FROM 50 LBB
TO START 50 LBB
13-52 CB PANELTRIP FROM 50 LBB
TO START 50 LBB
16-52 CB PANELTRIP FROM 50 LBB
TO START 50 LBB
+VE BUSBAR PANEL
BUSBAR-2 PROTECTION TRIPPING SCHEMEHIGH SPEEDTRIP RELAY
FOR 3-52 CB
TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER
3-52 CB PANEL
TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER
6-52 CB PANEL
TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER
9-52 CB PANEL
TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER
12-52CB PANEL
TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER
15-52 CB PANEL
TO CLOSE CKT INTERLOCKTO BLOCK A/RTO TRIP COIL-1TO TRIP COIL-2DIRECT TRIP SEND CH-1DIRECT TRIP SEND CH-2TO DISTURBENCE RECORDER
18-52 CB PANEL
HIGH SPEEDTRIP RELAY
FOR 6-52 CB
HIGH SPEEDTRIP RELAY
FOR 9-52 CB
HIGH SPEEDTRIP RELAY
FOR 12-52 CB
HIGH SPEEDTRIP RELAY
FOR 15-52 CB
HIGH SPEEDTRIP RELAY
FOR 18-52 CB
3-52 CB PANELTRIP FROM 50 LBB
TO START 50 LBB
6-52 CB PANELTRIP FROM 50 LBB
TO START 50 LBB
9-52 CB PANELTRIP FROM 50 LBB
TO START 50 LBB
12-52 CB PANELTRIP FROM 50 LBB
TO START 50 LBB
15-52 CB PANELTRIP FROM 50 LBB
TO START 50 LBB
18-52 CB PANELTRIP FROM 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
12345678
910111213141516
ABB Network Partner AG REC 316*4
21 L1 21 L2 21 L1 21 L2 21 L1 21 L2
C
E
ABB Network Partner AG REL531
C
E
12345678
910111213141516
ABB Network Partner AG REC 316*4
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
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
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
TRIP COIL-2 TRIP COIL-2 TRIP COIL-2
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
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ABB Network Partner AG REC 316*4
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
79 (A/R)+25(SYNC) RAAAMRASC
79 (A/R)+25(SYNC) RAAAMRASC
TRIP COMMANDSAUTO RECLOSURE
COMMANDS
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ABB Network Partner AG REL531
21 MAIN-1REL 521
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910111213141516
ABB Network Partner AG REC 316*4
21 MAIN-2REL 316
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ABB Network Partner AG REL531
21 MAIN-1REL 521
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910111213141516
ABB Network Partner AG REC 316*4
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
ONE AND HALFCIRCUIT BREAKER
SCHEME PREPARED BY
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
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 auto- reclose 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
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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)
87 BUSBAR TRIP (ZONE-2)
96 BUSBAR PROT-1 PANEL
96 BUSBAR PROT-2 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
59L2 / OVER VOLTAGE STAGE-2
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
87 BUSBAR TRIP (ZONE-1)
87 BUSBAR TRIP (ZONE-2)
96 BUSBAR PROT-1 PANEL
96 BUSBAR PROT-2 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
59L2 / OVER VOLTAGE STAGE-2
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)
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ABB Network Partner AG REL531
REL 521MAIN-1
PROTECTION
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1
2345678
9
10111213141516
ABB Network Partner AG REC 316*4
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1
2345678
9
10111213141516
ABB Network Partner AG REC 316*4
C
E
ABB Network Partner AG REL531
REL 316MAIN-2
PROTECTION
PLCCPANEL
PLCCPANEL
NSD 50PANEL
NSD 50PANEL
NSD 50PANEL
NSD 50PANEL
ELECTRICAL CONNECTION
ELECTRICAL CONNECTION
ELECTRICAL POWER LINE
FIBRE OPTIC PROTECTION SYSTEM(TELEPROTECTION)
C
E
ABB Network Partner AG REL531
REL 521MAIN-1
PROTECTION
C
E
1
2345678
9
10111213141516
ABB Network Partner AG REC 316*4
C
E
1
2345678
9
10111213141516
ABB Network Partner AG REC 316*4
C
E
ABB Network Partner AG REL531
REL 316MAIN-2
PROTECTION
NSD 70PANEL
NSD 70PANEL
NSD 70PANEL
NSD 70PANEL
ELECTRICAL CONNECTION
ELECTRICAL CONNECTION
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
ABB Network Partner AG REL531
REL 521MAIN-1
PROTECTION
C
E
1
2345678
9
10111213141516
ABB Network Partner AG REC 316*4
C
E
1
2345678
9
10111213141516
ABB Network Partner AG REC 316*4
C
E
ABB Network Partner AG REL531
REL 316MAIN-2
PROTECTION
MAIN-1 & MAIN-2PROTECTION FOR
AUTO TRANSFORMER ADOPTED IN
ONE AND HALFCIRCUIT BREAKER
SCHEMEPREPARED BY
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
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
BUS-1 CVT / BUS-2 CVT /
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
ONE AND HALF CIRCUIT BREAKER
SCHEME (OVER FLUX & REF FUNCTIONS)PREPARED BY
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
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
CIRCUIT BREAKER SCHEME
PREPARED BYGOPALA KRISHNA PALEPU
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
IN CASE OF REACTOR BUSHING CT P2 IS AWAY FROM REACTOR& P1 IS TOWARDS REACTOR
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
IN CASE OF REACTOR BUSHING CT P2 IS AWAY FROM REACTOR& P1 IS TOWARDS REACTOR
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
P2P2P2 CT MBVR11 / E111VY11 / E131VB11 / E151VN11 / E171
LINE/BUS REACTOR B/U IMPEDANCE PROTECTION
R-CT HV
BUSHING CT
CORE-3CTR: 200/1A
CLASS: PS CVT SELECTION
BUS-1 CVT / BUS-2 CVT /
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
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
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
CIRCUIT BREAKER SCHEME
PREPARED BYGOPALA KRISHNA PALEPU
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
D/T CH-2 RECEIVERELAYS
400KV LINE CB RELAY & PROTN PANEL
79 + 25(AUTO RECLOSURE + CHECK SYNC RELAY)
50 Z(LBB / BFR)
4RTB
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
D/T CH-1 RECEIVERELAYS
D/T CH-2 RECEIVERELAYS
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
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
BREAKERMULTIPLIC
ATION RELAY
UNDER VOLTAGE
RELAY
D/T CH-1 RECEIVERELAYS
D/T CH-2 RECEIVERELAYS
400KV LINE + R CB RELAY & PROTN PANEL
79 + 25(AUTO RECLOSURE + CHECK SYNC RELAY)
50 Z(LBB / BFR)
4RTB
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
D/T CH-1 RECEIVERELAYS
D/T CH-2 RECEIVERELAYS
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
CB TROUBLE ALARAM AND TRIP RELAYS
TSRTC-1
TSRTC-1I
DCI & II
86 GR -A 86 GR -B
BREAKERMULTIPLICATION RELAY
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
CB TROUBLE ALARAM AND TRIP RELAYS
TSRTC-1
TSRTC-1I
DCI & II
86 GR -A 86 GR -B
BREAKERMULTIPLICATION RELAY
AUX RLYS INTER TRIP
RECEIVE
AUX RLYS INTERTRIP RECEIVE
400KV BUS REACTOR CB RELAY & PROTN PANEL
79 + 25(AUTO RECLOSURE + CHECK SYNC RELAY)
50 Z(LBB / BFR)
4RTB
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
D/T CH-1 RECEIVERELAYS
D/T CH-2 RECEIVERELAYS
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
CB TROUBLE ALARAM AND TRIP RELAYS
TSRTC-1
TSRTC-1I
DCI & II
86 GR -A 86 GR -B
BREAKERMULTIPLICATION RELAY
400KV BUSBAR PROTECTION & COMMON CONTROL PANEL4RBB2 BBM1 + 96 UNITS 4RBB3 BBM2 + 96 UNITS
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. 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
CONFIGUARATION OF C & R 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
RS232 RS485 RS485SERVICE
1MRSC60029 1MRSC60028 1MRSC60028 1MRSC60028 1MRSC60028 1MRSC60028 1MRSC60028
Ethernet Switch
Hot Standby
Main Server Redunt Server
Line Printer forAlarm / Event Metering Values
DOT Matrix Printer
ABB Network Partner AG
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
ABB Network Partner AG
CE
COM581
Surveillancesystem
SUBSTATION AUTOMATION
Base System
ServiceModem
Network Partner SSLTA 88SRS485M SREDU/MSRS485M
RS232 RS485 RS485SERVICE
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
RS232 RS485 RS485SERVICE
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
ABB Network Partner AG
CE
910111213141516
910111213141516
910111213141516
CE
ABB Network Partner AGREL511
CE
ABB Network Partner AG REL531
CE
ABB Network Partner AG REL531
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
ONE AND HALF CIRCUIT BREAKER
SCHEMEPREPARED BY
GOPALA KRISHNA PALEPUADE/MRT(PROTECTION)
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
TRIP COIL-1 TRIP COIL-1 TRIP COIL-1
TRIP COIL-2 TRIP COIL-2 TRIP COIL-2
86-A : GROUP-A MASTER TRIP RELAY / HIGH SPEED TRIP RELAY 86-B : GROUP-B MASTER TRIP RELAY / HIGH SPEED TRIP RELAY
C
E
ABB Network Partner AG REL531
C
E
1
2345678
9
10111213141516
ABB Network Partner AG REC 316*4
21 MAIN 1
21 MAIN 2
C
E
ABB Network Partner AG REL531
C
E
1
2345678
9
10111213141516
ABB Network Partner AG REC 316*4
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 )
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)
TO LBB/BFR INITIATION
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB AUTO RECLOSURE
BLOCK 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 UNITS ( INTURN IT WILL TRIP 3-POLES ) INITIATE TIE CB GR-B 1-PH TRIP UNITS ( INTURN IT WILL TRIP 3-POLES )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB AUTO RECLOSURE
BLOCK TIE CB AUTO RECLOSURE
CARRIER SEND
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
TO LBB/BFR INITIATION
TO LBB/BFR INITIATION
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 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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB AUTO RECLOSURE
BLOCK TIE CB AUTO RECLOSURE
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION CAME)
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB AUTO RECLOSURE
BLOCK TIE CB AUTO RECLOSURE
CARRIER SEND ( IF PUTT OR2 SCHEME SELECTED )
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
CARRIER SIGNAL RECEIVED & ZONE-2 STARTER IS PICKUP CONDITION
CARRIER SIGNAL RECEIVED & ZONE-2 STARTER IS PICKUP CONDITION
TO LBB/BFR INITIATION
TO LBB/BFR INITIATION
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 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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB AUTO RECLOSURE
BLOCK TIE CB AUTO RECLOSURE
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION CAME)
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB AUTO RECLOSURE
BLOCK TIE CB AUTO RECLOSURE
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
TO LBB/BFR INITIATION
TO LBB/BFR INITIATION
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
TO TRIP COIL-1TO TRIP COIL-2
TO TRIP COIL-1TO TRIP COIL-2
186 R
186 Y
186 B
TO TRIP COIL-1TO TRIP COIL-2
TO TRIP COIL-1TO TRIP COIL-2
TO TRIP COIL-1TO TRIP COIL-2
CO286 R
286 Y
286 B
TO TRIP COIL-1TO TRIP COIL-2
TO TRIP COIL-1TO TRIP COIL-2
TO TRIP COIL-1TO TRIP COIL-2
CO286 R
286 Y
286 B
TO TRIP COIL-1TO TRIP COIL-2
TO TRIP COIL-1TO TRIP COIL-2
TO TRIP COIL-1TO TRIP COIL-2
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB & TIE CB AUTO RECLOSURE
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
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 EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER (BAY1 & BAY3)
BLOCK MAIN CB OF BAY1 & BAY3 AUTO RECLOSURE
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
CLOSE INTERLOCK OF MAIN CB & TIE CB
CLOSE INTERLOCK OF TIE CB
BLOCK TIE CB AUTO RECLOSURE
CLOSE INTERLOCK OF MAIN CB OF BAY1 & BAY 3
DIRECT TRANSFER TRIP-1 CARRIER SEND TO OTHER END
DIRECT TRANSFER TRIP-2 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)
86-GR-AMASTER TRIP RELAY
86-GR-BMASTER TRIP RELAY
DIRECT TRANSFER TRIP-1 CARRIER SEND TO BAY1 & BAY3 LINES
DIRECT TRANSFER TRIP-2 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 EVENT RECORDER ( SOE/ SCADA )
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
DIRECT TRIP SEND CHANNEL-2 TO OTHER END
INITIATE ALARM (ANNUNCIATION COME)
TO LBB/BFR INITIATION
TO DISTURBANCE RECORDER OF MAIN-2
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 EVENT RECORDER ( SOE/ SCADA )
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
DIRECT TRIP SEND CHANNEL-2 TO OTHER END
INITIATE ALARM (ANNUNCIATION COME)
TO LBB/BFR INITIATION
TO DISTURBANCE RECORDER OF MAIN-2
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB AUTO RECLOSURE
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB AUTO RECLOSURE
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
LINE /AT/FISOLATOR
OPENS
CLOSE INTERLOCK OF TIE CB
CLOSE INTERLOCK OF TIE CB
BLOCK TIE CB AUTO RECLOSURE
CLOSE INTERLOCK OF MAIN CB
BLOCK TIE CB AUTO RECLOSURE
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
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB AUTO RECLOSURE
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB AUTO RECLOSURE
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
CLOSE INTERLOCK OF TIE CB
CLOSE INTERLOCK OF TIE CB
BLOCK TIE CB AUTO RECLOSURE
CLOSE INTERLOCK OF MAIN CB
BLOCK TIE CB AUTO RECLOSURE
CLOSE INTERLOCK OF MAIN CB
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
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB & TIE CB AUTO RECLOSURE
DIRECT TRANSFER TRIP-1 CARRIER SEND TO OTHER END
DIRECT TRANSFER TRIP-2 CARRIER SEND TO OTHER END
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB & TIE CB AUTO RECLOSURE
DIRECT TRANSFER TRIP-1 CARRIER SEND TO OTHER END
DIRECT TRANSFER TRIP-2 CARRIER SEND TO OTHER END
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
110% OF V4 SECS FOR
FEEDER-15 SECS FOR FEEDER-2
110% OF V4 SECS FOR
FEEDER-15 SECS FOR FEEDER-2
CLOSE INTERLOCK OF MAIN CB & TIE CB
CLOSE INTERLOCK OF MAIN CB & TIE CB
OVER VOLTAGE STAGE-2
C
E
DISPLAY
ACTIVE START TRIP
REU 521
C
E
DISPLAY
ACTIVE START TRIP
REU 521
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER (MAIN-1 & MAIN-2)
BLOCK MAIN CB & TIE CB AUTO RECLOSURE
DIRECT TRANSFER TRIP-1 CARRIER SEND TO OTHER END
DIRECT TRANSFER TRIP-2 CARRIER SEND TO OTHER END
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
LINE EARTH SWITCH CLOSE PERMISSION ONLY.
120% OF V20m SECS
1O% OF V
CLOSE INTERLOCK OF MAIN CB & TIE CB
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
ABB Network Partner AG REL531
C
E
1
2345678
9
10111213141516
ABB Network Partner AG REC 316*4
C
E
1
2345678
9
10111213141516
ABB Network Partner AG REC 316*4
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
DIRECT TRIP SEND CH-2
MAIN CB 86-B
TIE CB 86-B
DIRECT TRIP SEND CH-1
MAIN CB 86-A
TIE CB 86-A
DIRECT TRIP SEND CH-1
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
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB AUTO RECLOSURE
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
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 )
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER
BLOCK MAIN CB AUTO RECLOSURE
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
DIRECT TRIP CHANNEL-1RECEIVED
DIRECT TRIPCHANNEL-2RECEIVED.
CLOSE INTERLOCK OF TIE CB
CLOSE INTERLOCK OF TIE CB
BLOCK TIE CB AUTO RECLOSURE
CLOSE INTERLOCK OF MAIN CB
BLOCK TIE CB AUTO RECLOSURE
CLOSE INTERLOCK OF MAIN CB
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 )
DIRECT TRIP CHANNEL-1RECEIVED
DIRECT TRIP CHANNEL-2RECEIVED
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
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER (MAIN-1 & MAIN-2)
INITIATE FLAG RELAY (FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
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
TO EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER (MAIN-1 & MAIN-2)
INITIATE FLAG RELAY (FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
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 )
TO EVENT RECORDER ( SOE/ SCADA )
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
TO EVENT RECORDER ( SOE/ SCADA )
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
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
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 )
TO EVENT RECORDER ( SOE/ SCADA )
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
TO EVENT RECORDER ( SOE/ SCADA )
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
67 HV ABCN
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 )
67 LVABCN
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 ( OVER FLUX PROTECTION FOR HV & LV)
C
E
DISPLAY
ACTIVE START TRIP
RALK
C
E
DISPLAY
ACTIVE START TRIP
RATUB
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 )
TO EVENT RECORDER ( SOE/ SCADA )
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
TO EVENT RECORDER ( SOE/ SCADA )
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
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
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 )
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
TRIP COIL-1 TRIP COIL-1 TRIP COIL-1
TRIP COIL-2 TRIP COIL-2 TRIP COIL-2
(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
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 )
TO EVENT RECORDER ( SOE/ SCADA )
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
TO EVENT RECORDER ( SOE/ SCADA )
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
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
INITIATE 400KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE 400KV TIE CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )
INITIATE 220KV MAIN CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES ) INITIATE 220KV TBC CB GR-A 3-PH TRIP UNIT ( INTURN IT WILL TRIP 3-POLES )
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 )
TO EVENT RECORDER ( SOE/ SCADA )
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
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 EVENT RECORDER ( SOE/ SCADA )
TO DISTURBANCE RECORDER (BAY1)
BLOCK MAIN CB OF BAY1 AUTO RECLOSURE
INITIATE FLAG RELAY (INTURN FLAG RELAY OPERATES)
INITIATE ALARM (ANNUNCIATION COME)
CLOSE INTERLOCK OF MAIN CB & TIE CB
CLOSE INTERLOCK OF TIE CB
BLOCK TIE CB 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
86-GR-BMASTER TRIP RELAY
96 BB BUSBAR RELAY
TIE LBBINITIATION
1-PH TRIP RELAYS OFMAIN-1 PROTECTION
OF LINE-1(BAY1)
1-PH TRIP RELAYS OFMAIN-2 PROTECTION
OF LINE-1 (BAY1)
86-GR-AMASTER TRIP RELAY
86-GR-BMASTER TRIP RELAY
DIRECT TRANSFER TRIP-1 CARRIER SEND TO BAY1 & BAY3 LINES
DIRECT TRANSFER TRIP-2 CARRIER SEND TO BAY1 & BAY3 LINES
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
PREPARED BYGOPALA KRISHNA PALEPU
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
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