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P. GOPALA KRISHNA ADE/400KV/APTRANSCO
INTERLOCKS
WHY INTERLOCKS ARE REQUIRED 1. PREVENTS HUMAN MISTAKES 2. INDEPENDENCY OF REQUIREMENT BETWEEN OPERATION OF CIRCUITS AND INTERLOCKING SHOULD BE KEPT IN MIND TO ACHIEVE HIGHEST POSSIBLE RELIABULITY.
INTERLOCKS
ISOLATOR AND EARTH SWITCH INTERLOCKS FOR 1. SINGLE MAIN BUS WITH TRANSFER BUS SYSTEM 2. DOUBLE MAIN BUS WITH TRANSFER BUS SYSTEM 3. ONE AND HALF BREAKER SYSTEM
INTERLOCKS
STANDARD PRACTICE 1. FOR BUS ISOLATON: EACH BUS HAVING BUS ISOLATOR FOR EACH BAY. 2. FOR CB ISOLATION: CIRCUIT BREAKER HAVING BOTH SIDES ISOLATORS. 3. FOR LINE/ICT ISOLATION: LINE / ICT HAVING LINE ISOLATOR. 4. FOR BUS MAINTANENCE: EACH BUS HAVING BUS EARTH SWITCH. 5. FOR CB MAINTANENCE: EACH ISOLATOR HAVING EARTH SWITCH TOWARDS CB SIDE. 6. FOR LINE / ICT MAINTANENCE: EACH LINE / ICT HAVING LINE EARTH SWITCH.
INTERLOCKS ISOLATORS 1. ISOLATORS ARE NO LOAD SWITCHES. THEY ARE NOT PERMITTED TO BREAK POWER CURRENT OR TO CONNECT DIFFERENT VOLTAGE SYSTEM. 2. MAKING OR BREAKING OF PARALLEL CIRCUITS IS PERMITTED. 3. AN ISOLATOR CONNECTED IN SERIES WITH A CB MAY BE OPERATED WHEN CB IS OPEN AND IF NONE OF ADJACENT EARTH SWITCHES IS CLOSED. EVEN IF ANOTHER ISOLATOR CONNECTED IN SERIES TO THE CB IS OPEN THE ISOLATOR IS NOT ALLOWED TO OPERATED UNLESS THE CB IS OPEN. 4. AN ISOLATOR CONNECTED TO A DUPLICATE BUSBAR OR AUXILIARY BUS MAY BE OPERATED IF i) NO LOAD IS CONNECTED AND NON OF THE EARTH SWITCH IS CLOSED. ii) A PARALLELING CIRCUIT TO THE ISOLATOR IS PRESENT. (ONLY THROUGH THE BUSCOUPLER FOR THE ISOLATORS THAT ARE CONNECTED TO THE TRANSFER BUS.
EARTH SWITCH 1. OPERATED ONLY IF THE ISOLATORS ON BOTH THE SIDES ARE OPEN. 2. EARTH SWITCHES WHICH CAN EARTH AN INCOMING LINE DIRECTLY OR THROUGH A CB CAN BE OPERATED IF AND ONLY IF THE LINE IS DEAD.
INTERLOCKS
INTERLOCKS SINGLE BUS & TRANSFER BUS SYSTEM T/F-2
T/F-1
TRANSFER BUS COUPLER
TRANSFER BUS
BUS BAY1
FEEDER1
BAY2
BAY3
BAY4
BAY5
FEEDER2
INTERLOCKS
LINE BAY
BB189E
MAIN BUS(A) BB389E
TRANSFER BUS( C ) 89-C
89-A
89-AE 52-CB 89-LE1
FOR 89-A/BAY ISOLATOR OPERATION: 1. 52 CB/BAY IN OPEN CONDITION. 2. 89AE/BAY EARTH SWITCH OPEN CONDITION. 3. 89LE1/BAY EARTH SWITCH OPEN CONDITION. 4. BB189E BUSEARTH SWITCH OPEN CONDITION. BB189E
89-L
52 CB/BAY 89-AE/BAY
FEEDER OR ICT OR REACTOR
89-LE2
89-LE1/BAY
OPEN OPEN OPEN
&
OPERATION
89A/BAY
OPEN
BB189E
52 CB
89-AE
89-LE1
OPEN
OPEN
OPEN
OPEN
89-A/BAY
INTER LOCK CONTACTOR
INTERLOCKS
LINE BAY
BB189E
MAIN BUS(A) BB389E
TRANSFER BUS( C ) 89-C
89-A
89-AE 52-CB 89-LE1
FOR 89-L ISOLATOR OPERATION: 1. 52 CB IN OPEN CONDITION. 2. 89AE EARTH SWITCH OPEN CONDITION. 3. 89LE1 EARTH SWITCH OPEN CONDITION. 4. 89LE2 LINE EARTH SWITCH OPEN CONDITION. OPEN 52 CB
89-L
OPEN 89-AE 89-LE1
FEEDER OR ICT OR REACTOR
89-LE2
89-LE2
OPEN
&
OPERATION
89L
OPEN
52 CB
89-AE
89-LE1
89-LE2
89-L
OPEN
OPEN
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS
LINE BAY
BB189E
MAIN BUS(A) BB389E
TRANSFER BUS( C ) 89-C
89-A
89-AE
FOR 89-AE EARTH SWITCH OPERATION: 1. 89-A ISOLATOR OPEN CONDITION. 2. 89-L ISOLATOR OPEN CONDITION.
52-CB 89-LE1
89-L
FEEDER OR ICT OR REACTOR
89-LE2
OPEN 89-A
89-L
OPEN
&
OPERATION
89-AE
89-A
89-L
89-AE
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS
LINE BAY
BB189E
MAIN BUS(A) BB389E
TRANSFER BUS( C ) 89-C
89-A
89-AE
FOR 89-LE1 EARTH SWITCH OPERATION: 1. 89-A ISOLATOR OPEN CONDITION. 2. 89-L ISOLATOR OPEN CONDITION.
52-CB 89-LE1
89-L
FEEDER OR ICT OR REACTOR
89-LE2
OPEN 89-A
89-L
OPEN
&
OPERATION
89-LE1
89-A
89-L
89-LE1
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS
LINE BAY
BB189E
MAIN BUS(A) BB389E
TRANSFER BUS( C ) 89-C
89-A
89-AE 52-CB 89-LE1
FOR 89-LE2 EARTH SWITCH OPERATION: 1. 89C BUS ISOLATOR OPEN CONDITION. 2. 89L LINE ISOLATOR OPEN CONDITION. 3. LINE DEAD CONDITION i.e U/V RELAY OPERATED. U/V RELAY
FOR 52 CB CIRCUIT BREAKER FOR LOCAL OPERATION: 1. 89-A ISOLATOR OPEN CONDITION. 2. 89-L ISOLATOR OPEN CONDITION. 3. 89-AE TBC EARTH SWITCH CLOSED CONDITION. 4. 89-LE1 EARTH SWITCH CLOSED CONDITION.
89-LE1 89-A 89-L
89-L 89-AE
FEEDER OR ICT OR REACTOR
89-LE2
89-LE1
89A
OPEN
OPEN OPEN CLOSE
&
LOCAL OPERATION
52-CB
CLOSE
89L
89-AE
89-LE1
52CB
OPEN
CLOSE
CLOSE
INTER LOCK CONTACTOR
INTERLOCKS
LINE BAY
BB189E
MAIN BUS(A) BB389E 89-C
89-A
TRANSFER BUS( C )
89-C 52-CB
89-A
89-AE 52-CB 89-LE1
89-L
FEEDER OR ICT OR REACTOR
89-LE2
89-CE
89-AE
TRANSFER BUS COUPLER FOR 89-C ISOLATOR OPERATION: 1. NO OTHER ISOLATOR IS CLOSED TO TRANSFER BUS C 2. BB389E EARTH SWITCH OPEN CONDITION. 3. 89LE2 EARTH SWITCH OPEN CONDITION. 4. 52 TBC CB IN OPEN CONDITION. OR 1. 52 CB IN CLOSED POSITION. 2. 89-A ISOLATOR CLOSED CONDITION. 3. 89-L ISOLATOR CLOSED POSITION. 4. 89-A/TBC BAY BUS-A ISOLATOR CLOSED POSITION. 5. 89-C/TBC BAY BUS-C ISOLATOR CLOSED POSITION. 6. NO OTHER ISOLATOR IS CLOSED TO TRANSFER BUS C 7. ADDITIONAL INTERLOCK PROTECTION TRANSFERRED MAY ALSO PUT THROUGH PROTECTION TRANSFER SWITCH.
INTERLOCKS 89-C/ LINE-2
89-C/ ICT-1
89-C/ ICT-2
+ VE
89-LE2 LINE-1
89-C/ LINE-1 FOR LINE-1
89-LE2 LINE-2
89-C/ LINE2 FOR LINE-2
89-TE2 ICT-1
89-C/ ICT-1 FOR ICT-1
89-TE2 ICT-2
89-C/ ICT-2
FUTURE BAYS
89-C/ LINE-1
LINE BAY
+ VE
FOR ICT-2
TO OBTAIN A CONTACT FOR NO OTHER ISOLATOR CLOSED TO BUSBAR’C’ 1. TO OBTAIN CONTACTS OF TRANSFER BUS COUPLER CIRCUIT CLOSSED IT IS PREFERED TO USE CONTACTS OF AUXILIARY RELAY ENERGISED UNDER THESE CONDITIONS. 2. TO MAKE SURE THE PROTECTION IS TRANSFERRED TO TBC CIRCUIT BREAKER BEFORE THE ISOLATOR IS CLOSSED, CONTACT OF TRIP TRANSFER SWITCH MAY BE UTILISED.
INTERLOCKS 52CB/TBC 89-LE2 BB389E NO OTHER ISOLATOR CLOSED TO BUSBAR-C
LINE BAY
OPEN TTS
OPEN
&
OPEN
89-C/TBC 52CB/BAY 89-A
89-C/BAY
CLOSE
89-A/TBC
CLOSE
OR
TRANSFER
OPERATION
CLOSE CLOSE
&
CLOSE
CLOSE 89L NO OTHER CLOSE ISOLATOR CLOSED TO BUSBAR-C
52CB/TBC
89LE2
BB389E
OPEN
OPEN
OPEN
NO OTHER ISOLATOR CLOSED TO BUSBAR-C
89-C/BAY
CLOSE
INTER LOCK CONTACTOR
89C/TBC
52CB/BAY
89A/BAY
89L/BAY
NO OTHER ISOLATOR CLOSED TO BUSBAR-C
CLOSE
CLOSE
CLOSE
CLOSE
CLOSE
TTS
N
T
.
89-A/TBC
CLOSE
INTERLOCKS
TBC BAY
BB189E
MAIN BUS(A) BB389E
TRANSFER BUS( C ) 89-C
89-CE
52-CB
89-A
89-AE
FOR 89-A / TBC ISOLATOR OPERATION: 1. 52 CB / TBC IN OPEN CONDITION. 2. 89AE / TBC EARTH SWITCH OPEN CONDITION. 3. 89CE / TBC EARTH SWITCH OPEN CONDITION. 4. BB189E BUSEARTH SWITCH OPEN CONDITION.
TRANSFER BUS COUPLER BB189E 52 CB / TBC 89-AE / TBC 89-CE / TBC
BB189E
OPEN
OPEN OPEN OPEN
&
OPERATION
89A / TBC
OPEN
52 CB/TBC
89-AE/TBC
89-CE/TBC
89-A/TBC
OPEN
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS
TBC BAY
BB189E
MAIN BUS(A) BB389E
TRANSFER BUS( C ) 89-C
89-CE
52-CB
89-A
89-AE
FOR 89-C / TBC ISOLATOR OPERATION: 1. 52 CB / TBC IN OPEN CONDITION. 2. 89AE / TBC EARTH SWITCH OPEN CONDITION. 3. 89CE / TBC EARTH SWITCH OPEN CONDITION. 4. BB389E BUSEARTH SWITCH OPEN CONDITION.
TRANSFER BUS COUPLER BB389E 52 CB / TBC 89-AE / TBC 89-CE / TBC
BB389E
OPEN
OPEN OPEN OPEN
&
OPERATION
89C / TBC
OPEN
52 CB/TBC
89-AE/TBC
89-CE/TBC
89-C/TBC
OPEN
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS
TBC BAY
BB189E
MAIN BUS(A) BB389E
TRANSFER BUS( C ) 89-C
89-CE
52-CB
89-A
89-AE
FOR 89-AE / TBC EARTH SWITCH OPERATION: 1. 89-A / TBC ISOLATOR OPEN CONDITION. 2. 89-C / TBC ISOLATOR OPEN CONDITION.
TRANSFER BUS COUPLER OPEN 89-A / TBC
89-C/TBC
OPEN
&
OPERATION
89-AE / TBC
89-A/TBC
89-C/TBC
89-AE/TBC
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS
TBC BAY
BB189E
MAIN BUS(A) BB389E
TRANSFER BUS( C ) 89-C
89-CE
52-CB
89-A
89-AE
FOR 89-CE / TBC EARTH SWITCH OPERATION: 1. 89-A / TBC ISOLATOR OPEN CONDITION. 2. 89-C / TBC ISOLATOR OPEN CONDITION.
FOR 89-A / BC ISOLATOR OPERATION: 1. 52 CB / BC IN OPEN CONDITION. 2. 89AE / BC EARTH SWITCH OPEN CONDITION. 3. 89BE / BC EARTH SWITCH OPEN CONDITION. 4. BB189E BUSEARTH SWITCH OPEN CONDITION.
BUS COUPLER BB189E 52 CB / BC 89-AE / BC 89-BE / BC
BB189E
OPEN
OPEN OPEN OPEN
&
OPERATION
89A / BC
OPEN
52 CB/BC
89-AE/BC
89-BE/BC
89-A/BC
OPEN
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS
BC BAY
BB189E
MAIN BUS-1(A) BB289E
MAIN BUS-2(B) 89-A
89-AE
89-B
52-CB
89-BE
FOR 89-B / BC ISOLATOR OPERATION: 1. 52 CB / BC IN OPEN CONDITION. 2. 89AE / BC EARTH SWITCH OPEN CONDITION. 3. 89BE / BC EARTH SWITCH OPEN CONDITION. 4. BB289E BUSEARTH SWITCH OPEN CONDITION.
BUS COUPLER BB289E 52 CB / BC 89-AE / BC 89-BE / BC
BB289E
OPEN
OPEN OPEN OPEN
&
OPERATION
89B / BC
OPEN
52 CB/BC
89-AE/BC
89-BE/BC
89-B/BC
OPEN
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS
BC BAY
BB189E
MAIN BUS-1(A) BB289E
MAIN BUS-2(B) 89-A
89-AE
89-B
52-CB
89-BE
FOR 89-AE / BC EARTH SWITCH OPERATION: 1. 89-A / BC ISOLATOR OPEN CONDITION. 2. 89-B / BC ISOLATOR OPEN CONDITION.
BUS COUPLER OPEN 89-A / TBC
89-B/TBC
OPEN
&
OPERATION
89-AE / BC
89-A/BC
89-B/BC
89-AE/BC
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS
BC BAY
BB189E
MAIN BUS-1(A) BB289E
MAIN BUS-2(B) 89-A
89-AE
89-B
52-CB
89-BE
FOR 89-BE / BC EARTH SWITCH OPERATION: 1. 89-A / BC ISOLATOR OPEN CONDITION. 2. 89-B / BC ISOLATOR OPEN CONDITION.
BUS COUPLER OPEN 89-A / BC
89-B/BC
OPEN
&
OPERATION
89-BE / BC
89-A/BC
89-B/BC
89-BE/BC
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS
BC BAY
BB189E
MAIN BUS-1(A) BB289E
MAIN BUS-2(B) 89-A
89-AE
89-B
52-CB
89-BE
BUS COUPLER
FOR 52 CB / BC CIRCUIT BREAKER FOR REMOTE OPERATION: 1. 86-GA / BC HSTR/MTR RESET CONDITION. 2. 86-GB / BC HSTR/MTR RESET CONDITION. 3. 96-BB / BC HSTR/MTR RESET CONDITION.
86-GA/BC 86-GB/BC 96-BB/BC
RESET RESET
&
REMOTE OPERATION
52-CB/BC
RESET
86-GA/BC
86-GB/BC
96-BB/BC
52-CB/BC
RESET
RESET
RESET
INTER LOCK CONTACTOR
INTERLOCKS
BC BAY
BB189E
MAIN BUS-1(A) BB289E
MAIN BUS-2(B) 89-A
89-AE
89-B
52-CB
89-BE
FOR 52 CB / BC CIRCUIT BREAKER FOR LOCAL OPERATION: 1. 89-A / BC ISOLATOR OPEN CONDITION. 2. 89-B / BC ISOLATOR OPEN CONDITION. 3. 89-AE / BC EARTH SWITCH CLOSED CONDITION. 4. 89-BE / BC EARTH SWITCH CLOSED CONDITION.
BUS COUPLER 89-A/BC 89-B/BC 89-AE/BC 89-BE/BC 89A/BC
89B/BC
OPEN
OPEN
OPEN OPEN CLOSE
&
LOCAL OPERATION
52-CB / BC
CLOSE
89-AE/BC
89-BE/BC
52CB/BC
CLOSE
CLOSE
INTER LOCK CONTACTOR
INTERLOCKS BB189E
MAIN BUS-1(A)
BB289E
MAIN BUS-2(B)
BB389E 89-AE
BUS ES
TRANSFER BUS( C ) 89-A
52-CB
89-LE1 89-L
89-LE2
FEEDER OR ICT OR REACTOR OF BAY
89-B
89-C
89-AE
89-A
52-CB
89-CE
TRANSFER BUS COUPLER
89-B
89-C
89-A
89-B
89-AE
52-CB
89-BE
BUS COUPLER
BUS EARTH SWITCH
INTERLOCKS
BB289E
BB189E 89-A/BAY1 89-A/BAY2
OPEN
UP TO NO OF BAYS
89-A/BAYn
OPEN
89-B/BAY1
OPEN
&
OPERATION
BB189E
OPEN
89-B/BAY2
89-A/BAY2
OPEN
OPEN
89-B /BAY1
89-B/BAY2
OPEN
OPEN
89-C /BAY1
89-C/BAY2
OPEN
OPEN
89-C/BAY1
OPEN
UP TO NO OF BAYS
89-B/BAYn
89-A /BAY1
UP TO NO OF BAYS
UP TO NO OF BAYS
UP TO NO OF BAYS
BB389E
&
OPERATION
BB289E
OPEN
89-C/BAY2
BB189E
OPEN
INTER LOCK CONTACTOR
89-B / BAY n
BB289E
OPEN
INTER LOCK CONTACTOR
89-C / BAY n
BB389E
OPEN
INTER LOCK CONTACTOR
OPEN
UP TO NO OF BAYS
89-C/BAYn
89-A / BAY n
OPEN
&
OPERATION
BB389E
OPEN
FOR BUS EARTH SWITCH OPERATION, ALL ISOLATORS CONNECTED TO CONCERNED BUS ARE TO BE OPENED.
INTERLOCKS
BAY16 BAY18
BAY14
BAY17
BAY13
DIA6
BAY15
BAY5 BAY6
FEEDER11
DIA5
BAY11
BAY1 BAY2 BAY3
DIA4 BAY10
DIA3
BAY4
DIA2
FEEDER9
FEEDER7
BAY8
BUS-1 DIA1
FEEDER5
BAY12
FEEDER3
BAY9
FEEDER1
I-CONFIGUARATION
BAY7
INTERLOCKS
BUS-2
FEEDER2
FEEDER4
FEEDER6
FEEDER8
FEEDER10
FEEDER12
INTERLOCKS
D-CONFIGUARATION FEEDER10 BAY14
BAY13
BAY7
DIA1
FEEDER9
BAY8
BAY3
BAY1
BAY2
FEEDER6
DIA3
BAY15
FEEDER5
FEEDER2
BAY9
FEEDER1
DIA5
BUS-1
BAY5
FEEDER3
BAY11
FEEDER4
FEEDER7
FEEDER8
DIA6
BAY18
BAY16
DIA4
BAY12
BAY10
DIA2
BAY6
BAY4
BUS-2
BAY17
FEEDER11
FEEDER12
INTERLOCKS
ONE & HALF BREAKER SYSTEM BB1-89E
BUS-2 BB2-89E
BUS-1
3-89
1-89 1-89E
3-89E
3-52CB
1-52CB
3-89AE
1-89AE
3-89A
1-89A
1-PH NEUTRAL GROUNDING REACTOR
.
UUU
LINE SHUNT REACTOR
UUU
1-89RE
2-89A
1-89R
2-89AE
1-89L
1-89LE
2-89B 2-52CB
2-89BE
3-89T
3-89TE
LINE 1 T/F-1
INTERLOCKS BB1-89E
BAY 1
BUS-1
1-89 1-89E
1-52CB
FOR 1-89 ISOLATOR OPERATION: BB189E
1-89AE
1-89AE
1-89A
UUU
.
UUU
LINE SHUNT REACTOR
1-89RE
1-89E
1-89R
1-52CB
OPEN OPEN OPEN
& OPERATION
1-89
OPEN
1-89L BB189E
1-89AE
1-89E
OPEN
OPEN
OPEN
1-52 CB
1-89
OPEN
INTER LOCK CONTACTOR
1-89LE
LINE 1
INTERLOCKS BB1-89E
BAY 1
BUS-1
1-89 1-89E
1-52CB
1-89AE
FOR 1-89E ISOLATOR OPERATION: 1-89A
& OPERATION1-89E
1-89A
UUU
.
UUU
LINE SHUNT REACTOR
1-89RE
1-89
1-89R
OPEN
OPEN
1-89L 1-89A
1-89
OPEN
OPEN
1-89E
1-89LE
LINE 1
INTER LOCK CONTACTOR
INTERLOCKS BB1-89E
BAY 1
BUS-1
1-89 1-89E
1-52CB
1-89AE 1-89A
UUU
.
UUU
LINE SHUNT REACTOR
1-89RE
1-89R
FOR 1-89A ISOLATOR OPERATION: 1-89AE 1-89E 1-52CB
OPEN OPEN
& OPERATION1-89A
OPEN
1-89L 1-89AE
1-89E
OPEN
OPEN
1-52 CB
1-89A
OPEN
INTER LOCK CONTACTOR
1-89LE
LINE 1
INTERLOCKS BB1-89E
BAY 1
BUS-1
1-89 1-89E
1-52CB
1-89AE
FOR 1-89AE EARTH SWITCH OPERATION: 1-89A
& OPERATION 1-89AE
1-89A
UUU
.
UUU
LINE SHUNT REACTOR
1-89RE
1-89
1-89R
OPEN
OPEN
1-89L 1-89A
1-89
OPEN
OPEN
1-89AE
1-89LE
LINE 1
INTER LOCK CONTACTOR
INTERLOCKS BB1-89E
BUS-1
BAY 1 FOR 1-89L ISOLATOR OPERATION: IL INTER LOCK FACILITY: WHEN 1-89R CLOSES ONLY PERMIT TO CLOSE 1-89L AND 1-89L OPENS ONLY PERMIT TO OPEN 1-89R.
1-89 1-89E
1-52CB 1-89R
1-89AE
CLOSE
OR PUSH DC INTERLOCK 2-52CB BYPASS PB 1-89LE
1-89A 1-89R
OPEN
& OPERATION
1-89L
OPEN
DC INTERLOCK BYPASS PB
UUU
IL
.
UUU
LINE SHUNT REACTOR
1-89RE
1-52CB
OPEN
1-89L
PUSH 1-89R
2-52 CB
1-89LE
1-52 CB
1-89L
OPEN
INTER LOCK CONTACTOR
1-89LE CLOSE
LINE 1
OPEN
OPEN
INTERLOCKS BB1-89E
BAY 1
BUS-1
1-89 1-89E
1-52CB
1-89AE
FOR 1-89LE EARTH SWITCH OPERATION: 1-89L
& OPERATION 1-89LE
1-89A
UUU
.
UUU
LINE SHUNT REACTOR
1-89RE
LINE U/V RELAY
1-89R
OPEN
OPTD
1-89L LINE U/V RELAY
1-89L
1-89LE
OPTD
OPEN
INTER LOCK CONTACTOR
1-89LE
LINE 1
INTERLOCKS BB1-89E
BAY 1
BUS-1
1-89 1-89E
FOR 1-89R ISOLATOR OPERATION: 1-52CB 1-89RE 2-52CB
1-89AE
1-89L
1-89A
OPEN OPEN
& OPERATION
1-89L
OPEN
1-89R
UUU
IL
.
UUU
LINE SHUNT REACTOR
1-89RE
1-52CB
OPEN
1-89L 1-89RE
2-52 CB
1-89LE
1-52 CB
1-89L
OPEN
INTER LOCK CONTACTOR
1-89LE OPEN
LINE 1
OPEN
OPEN
INTERLOCKS BB1-89E
BAY 1
BUS-1
1-89 1-89E
1-52CB
FOR 1-89RE EARTH SWITCH OPERATION:
1-89AE 1-89A
UUU
.
UUU
LINE SHUNT REACTOR
1-89RE
1-89R
OPEN
OPERATION
1-89RE
1-89R
1-89L 1-89R
1-89RE
OPEN
INTER LOCK CONTACTOR
1-89LE
LINE 1
INTERLOCKS BB1-89E
BUS-1
1-52 CB
BAY1
LOCAL 1-89E
1-89 1-89E
CLOSE
& 1-89AE
1-52CB
LOCAL OPERATION
1-52 CB
CLOSE
1-89 AE
1-89 E
1-52 CB
CLOSE
CLOSE
INTER LOCK CONTACTOR
1-89AE 1-89A
UUU
.
UUU
LINE SHUNT REACTOR
1-89RE
1-89R
1-89L
REMOTE
86-GA/BAY1 86-GB/BAY1
RESET RESET
&
REMOTE 1-52 CB OPERATION
RESET
1-89LE
96-BB/BAY1
86-GA/BAY1
86-GB/BAY1
96-BB/BAY1
1-52 CB
RESET
RESET
INTER LOCK CONTACTOR
LINE 1 RESET
INTERLOCKS 2-89A 2-89AE
BAY 2 2-89B
2-52CB
2-89BE
FOR 2-89A ISOLATOR OPERATION:
2-52 CB 289-AE 289-BE
OPEN OPEN
&
OPERATION
2-89A
OPEN
2-52 CB
289-AE
289-BE
2-89A
OPEN
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS 2-89A 2-89AE
BAY 2 2-89B
2-52CB
2-89BE
FOR 2-89B ISOLATOR OPERATION:
2-52 CB 289-AE 289-BE
OPEN OPEN
&
OPERATION
2-89B
OPEN
2-52 CB
289-AE
289-BE
2-89B
OPEN
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS 2-89A 2-89AE
BAY 2 2-89B
2-52CB
2-89BE
FOR 2-89AE EARTH SWITCH OPERATION:
289-A 289-B
OPEN OPEN
&
OPERATION
2-89AE
289-A
289-B
2-89AE
OPEN
OPEN
INTER LOCK CONTACTOR
INTERLOCKS 2-89A 2-89AE
BAY 2 2-89B
2-52CB
2-89BE
FOR 2-89BE EARTH SWITCH OPERATION:
289-A 289-B
OPEN OPEN
&
OPERATION
2-89BE
289-A
289-B
2-89BE
OPEN
OPEN
INTER LOCK CONTACTOR
2-52 CB
INTERLOCKS
BAY2
LOCAL 2-89A 2-89AE
2-89BE
2-89B 2-52CB
CLOSE
&
2-89BE 2-89AE
REMOTE
86-GA/BAY2 86-GB/BAY2
LOCAL OPERATION
2-52 CB
CLOSE
2-89 AE
2-89 BE
2-52 CB
CLOSE
CLOSE
INTER LOCK CONTACTOR
RESET RESET
&
REMOTE 2-52 CB OPERATION
RESET 96-BB/BAY2 FOR HALF DIA ONLY
86-GA/BAY2
RESET
86-GB/BAY2
RESET
96-BB/BAY2
2-52 CB
RESET FOR HALF DIA ONLY
INTER LOCK CONTACTOR
INTERLOCKS BB2-89E
BAY 3
BUS-2
3-89 3-89E
3-52CB
FOR 3-89 ISOLATOR OPERATION: 3-89AE BB289E
3-89A
3-89AE 3-89E 3-52CB
OPEN OPEN OPEN
& OPERATION
3-89
OPEN
3-89T
3-89TE
ICT
BB289E
3-89AE
3-89E
OPEN
OPEN
OPEN
3-52 CB
3-89
OPEN
INTER LOCK CONTACTOR
INTERLOCKS BB2-89E
BAY 3
BUS-2
3-89 3-89E
3-52CB
FOR 3-89E EARTH SWITCH OPERATION: 3-89AE 3-89A
3-89A
OPEN
& OPERATION3-89E 3-89
OPEN
3-89T
3-89TE
ICT
3-89A
3-89
OPEN
OPEN
3-89E
INTER LOCK CONTACTOR
INTERLOCKS BB2-89E
BAY 3
BUS-2
3-89 3-89E
3-52CB
FOR 3-89A ISOLATOR OPERATION: 3-89AE 3-89A
3-89AE 3-89E 3-52CB
OPEN OPEN OPEN
&
OPERATION
3-89A
3-89T
3-89TE
ICT
3-89AE
3-89E
OPEN
OPEN
3-52 CB
3-89A
OPEN
INTER LOCK CONTACTOR
INTERLOCKS BB2-89E
BAY 3
BUS-2
3-89 3-89E
3-52CB
FOR 3-89AE EARTH SWITCH OPERATION: 3-89AE 3-89A
3-89A
OPEN
& OPERATION3-89AE 3-89
OPEN
3-89T
3-89TE
ICT
3-89A
3-89
OPEN
OPEN
3-89AE
INTER LOCK CONTACTOR
INTERLOCKS BB2-89E
BAY 3
BUS-2
3-89 3-89E
3-52CB
FOR 3-89T ISOLATOR OPERATION: 3-89AE LV89TE2
3-89A
2-52 CB 3-89TE 3-52CB
OPEN OPEN OPEN
& OPERATION
3-89T
3-89TE
3-52 CB
3-89T
OPEN
INTER LOCK CONTACTOR
OPEN
3-89T
3-89TE
LV89TE2
OPEN
ICT
2-52CB
OPEN
OPEN
INTERLOCKS BB2-89E
BAY 3
BUS-2
3-89 3-89E
3-52CB
FOR 3-89TE EARTH SWITCH OPERATION: 3-89AE 3-89T
3-89A
OPEN
& OPERATION3-89TE LV89T
OPEN
3-89T
3-89TE
ICT
3-89T
LV89T
OPEN
OPEN
3-89TE
INTER LOCK CONTACTOR
INTERLOCKS BB2-89E
BUS-2
3-52 CB
BAY3
LOCAL
3-89 3-89E
3-89E
CLOSE
& 3-89AE
3-52CB
LOCAL OPERATION
CLOSE
3-89 AE
3-89 E
3-52 CB
CLOSE
CLOSE
INTER LOCK CONTACTOR
3-89AE 3-89A
REMOTE 3-89T
86-GA/BAY3 86-GB/BAY3
3-52 CB
RESET RESET
&
REMOTE 3-52 CB OPERATION
RESET
3-89TE
96-BB/BAY3
86-GA/BAY3
ICT
RESET
86-GB/BAY3
96-BB/BAY3
3-52 CB
RESET
RESET
INTER LOCK CONTACTOR
INTERLOCKS
BUS EARTH SWITCH BB289E
BB189E 1-89/ DIA1 4-89/ DIA2 7-89/ DIA3
OPEN
3-89/ DIA1
OPEN
6-89/ DIA2
OPEN
&
OPERATION
9-89/ DIA3
BB189E
OPEN OPEN OPEN
&
OPERATION
BB289E
UP TO NO OF DIAS OPEN
UP TO NO OF DIAS OPEN
DIA N
DIA N
FOR BUS EARTH SWITCH OPERATION, ALL ISOLATORS CONNECTED TO CONCERNED BUS ARE TO BE OPENED. 1-89/DIA1
4-89/DIA2
7-89/DIA3
OPEN
OPEN
OPEN
3-89/DIA1
6-89/DIA2
9-89/DIA3
OPEN
OPEN
OPEN
UP TO NO OF DIAS
UP TO NO OF BAYS
DIA N
BB189E
OPEN
INTER LOCK CONTACTOR
DIA N
BB289E
OPEN
INTER LOCK CONTACTOR
ISOLATOR INTERLOCKS
NOTE: All Earth Switches in the Bay are towards Circuit Breaker side only. The Line and Transformer Earth Switches are towards Line & Transformer. O: OPEN C: CLOSE A: ACTED
BB189E : BUSBAR-1 EARTH SWITCH . BB289E : BUSBAR-2EARTH SWITCH . UV RELAY: UNDER VOLTAGE RELAY.
S.NO
ISOLATOR OPEN/CLOSE
EQUIPMENT-1
EQUIPMENT-2
EQUIPMENT-3
EQUIPMENT-4
INTERLOCKS REQUIRED FOR CONCERNED ISOLATOR / EARTH SWITCH OPEN OR CLOSE
