Iso Es Cb Interlocks

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

OPTD

89-L 89-C

FEEDER OR ICT OR REACTOR

89-LE2

89-L

OPEN

&

OPERATION

89-LE2

OPEN

U/V RELAY

89-C

89-L

89-LE2

OPTD

OPEN

OPEN

INTER LOCK CONTACTOR

INTERLOCKS

LINE BAY

BB189E

MAIN BUS(A) BB389E

TRANSFER BUS( C ) 89-C

89-A

89-AE 52-CB

FOR 52 CB CIRCUIT BREAKER FOR REMOTE OPERATION: 1. 86-GA HSTR/MTR RESET CONDITION. 2. 86-GB HSTR/MTR RESET CONDITION. 3. 96-BB TBC HSTR/MTR RESET CONDITION.

89-LE1 86-GA

RESET

89-L 86-GB

FEEDER OR ICT OR REACTOR

89-LE2

96-BB

RESET

&

REMOTE OPERATION

52-CB

RESET

86-GA

86-GB

96-BB

52-CB

RESET

RESET

RESET

INTER LOCK CONTACTOR

INTERLOCKS

LINE BAY

BB189E

MAIN BUS(A) BB389E

TRANSFER BUS( C ) 89-C

89-A

89-AE 52-CB

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.

TRANSFER BUS COUPLER OPEN 89-A / TBC

89-C/TBC

OPEN

&

OPERATION

89-CE / TBC

89-A/TBC

89-C/TBC

89-CE/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 52 CB / TBC CIRCUIT BREAKER FOR REMOTE OPERATION: 1. 86-GA / TBC HSTR/MTR RESET CONDITION. 2. 86-GB / TBC HSTR/MTR RESET CONDITION. 3. 96-BB / TBC HSTR/MTR RESET CONDITION.

TRANSFER BUS COUPLER 86-GA/TBC 86-GB/TBC 96-BB/TBC

RESET RESET

&

REMOTE OPERATION

52-CB/TBC

RESET

86-GA/TBC

86-GB/TBC

96-BB/TBC

52-CB/TBC

RESET

RESET

RESET

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 52 CB / TBC CIRCUIT BREAKER FOR LOCAL OPERATION: 1. 89-A / TBC ISOLATOR OPEN CONDITION. 2. 89-C / TBC ISOLATOR OPEN CONDITION. 3. 89-AE / TBC EARTH SWITCH CLOSED CONDITION. 4. 89-CE / TBC EARTH SWITCH CLOSED CONDITION.

TRANSFER BUS COUPLER 89-A/TBC 89-C/ TBC 89-AE / TBC 89-CE / TBC

89A/TBC

OPEN

OPEN OPEN CLOSE

&

LOCAL 52-CB / TBC OPERATION

CLOSE

89C/TBC

89-AE/TBC

89-CE/TBC

52CB/TBC

OPEN

CLOSE

CLOSE

INTER LOCK CONTACTOR

INTERLOCKS

BUS BAY

BB189E

MAIN BUS(A) BB389E 89-C

89-A

TRANSFER BUS( C )

89-C 89-A

52-CB 89-AE 52-CB 89-LE1

89-L

89-CE

89-AE

TRANSFER BUS COUPLER FOR BB189E EARTH SWITCH OPERATION: 1. ALL BAYS BUS-A ISOLATORS OPEN CONDITION 89-A/BAY1

FEEDER OR ICT OR REACTOR

89-LE2

89-A/BAY2

OPEN OPEN

&

UP TO NO OF BAYS

89-A/BAYn

OPERATION

BB189E

OPEN

89-A /BAY1

89-A/BAY2

OPEN

OPEN

UP TO NO OF BAYS

89-A / BAY n

BB189E

OPEN

INTER LOCK CONTACTOR

INTERLOCKS

BUS BAY

BB189E

MAIN BUS(A) BB389E 89-C

89-A

TRANSFER BUS( C )

89-C 89-A

52-CB 89-AE 52-CB 89-LE1

89-L

89-CE

89-AE

TRANSFER BUS COUPLER FOR BB389E EARTH SWITCH OPERATION: 1. ALL BAYS BUS-C ISOLATORS OPEN CONDITION 89-C/BAY1

FEEDER OR ICT OR REACTOR

89-LE2

89-C/BAY2

OPEN OPEN

&

UP TO NO OF BAYS

89-C/BAYn

OPERATION

BB389E

OPEN

89-C /BAY1

89-C/BAY2

OPEN

OPEN

UP TO NO OF BAYS

89-C / BAY n

BB389E

OPEN

INTER LOCK CONTACTOR

INTERLOCKS

INTERLOCKS DOUBLE MAIN BUS & TRANSFER BUS SYSTEM T/F-1

T/F-2

BUS-2

BAY3 BAY1

BAY2

FEEDER1 FEEDER2

BAY4

TRANSFER BUS

BAY5

TRANSFER BUS COUPLER

BUS COUPLER

BUS-1

BAY6

BAY7

BAY8

FEEDER3 FEEDER4

INTERLOCKS

FEEDER BAY

BB189E

MAIN BUS-1(A)

FOR 89-A/BAY ISOLATOR OPERATION:

BB289E

MAIN BUS-2(B) TRANSFER BUS( C ) 89-A

89-B

89-C

89-B/BAY 52CB/BAY 89-A/BC

89-LE1

89-B/BC 89-L

FEEDER OR ICT OR REACTOR OF BAY

52CB/TBC

89-B/BAY

CLOSE

OPEN

89-AE/BAY

&

OPEN

89-B/BAY

52-CB

89-LE2

OPEN

89-LE1/BAY

BB389E 89-AE

OPEN

52CB/BAY

CLOSE CLOSE CLOSE

&

OR

BB189E OPEN

&

OPERATION 89-A/BAY

CLOSE CLOSE

52CB/BAY

89LE1/BAY

89-AE/BAY

89-B/BAY

BB189E

89-A/BAY

OPEN

OPEN

OPEN

OPEN

OPEN

89-B/BC

52 CB/BC

89-A/BC

INTER LOCK CONTACTOR

CLOSE

CLOSE

52CB/BAY

CLOSE

CLOSE

INTERLOCKS

FEEDER BAY

BB189E

MAIN BUS-1(A)

FOR 89-B/BAY ISOLATOR OPERATION:

BB289E

MAIN BUS-2(B) TRANSFER BUS( C ) 89-A

89-B

89-C

89-A/BAY 52CB/BAY 89-A/BC

89-LE1

89-B/BC 89-L

FEEDER OR ICT OR REACTOR OF BAY

52CB/TBC

89-A/BC

CLOSE

OPEN

89-AE/BAY

&

OPEN

89-A/BAY

52-CB

89-LE2

OPEN

89-LE1/BAY

BB389E 89-AE

OPEN

52CB/BAY

CLOSE CLOSE CLOSE

&

OR

BB289E OPEN

&

OPERATION 89-B/BAY

CLOSE CLOSE

52CB/BAY

89LE1/BAY

89-AE/BAY

89-A/BAY

BB289E

89-B/BAY

OPEN

OPEN

OPEN

OPEN

OPEN

89-B/BC

52 CB/BC

89-A/BAY

INTER LOCK CONTACTOR

CLOSE

CLOSE

52CB/BAY

CLOSE

CLOSE

INTERLOCKS 52CB/TBC 89-LE2/BAY BB389E NO OTHER ISOLATOR CLOSED TO BUSBAR-C

FEEDER BAY

OPEN TTS

OPEN

&

OPEN

89-C/TBC 52CB/BAY

CLOSE

89-B/TBC 89-B/BAY

89-A/TBC 89-A/BAY

89L/BAY

& & 89LE2

BB389E

OPEN

OPEN

OPEN

89B/TBC

N

T

.

CLOSE CLOSE

&

FOR 89-C/BAY ISOLATOR OPERATION:

52CB/TBC

TTS

CLOSE

OR

CLOSE CLOSE

89-C/BAY

NO OTHER CLOSE ISOLATOR CLOSED TO BUSBAR-C

CLOSE CLOSE

OR

TRANSFER

OPERATION

CLOSE 89-A/TBC

CLOSE

NO OTHER ISOLATOR CLOSED TO BUSBAR-C

89-C/BAY

CLOSE

INTER LOCK CONTACTOR

89B/BAY

CLOSE 89A/BAY

89C/TBC

52CB/BAY

89L/BAY

NO OTHER ISOLATOR CLOSED TO BUSBAR-C

CLOSE

CLOSE

CLOSE

CLOSE

CLOSE

INTERLOCKS

FEEDER BAY

BB189E

MAIN BUS-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

89-B

89-C

FOR 89-L/BAY ISOLATOR OPERATION: 52-CB

52 CB/BAY

OPEN OPEN

89-LE1/BAY 89-LE2/BAY

89-LE1

89-AE/BAY

89-L

OPEN

&

OPERATION

89L/BAY

OPEN

OPEN ICT HV TE (FOR ICT ONLY)

89-LE2

FEEDER OR ICT OR REACTOR OF BAY

52 CB/BAY

OPEN

ICT HV TE

OPEN (FOR ICT ONLY)

89-AE/BAY

OPEN

89-LE1/BAY

89-LE2/BAY

89-L

OPEN

OPEN

INTER LOCK CONTACTOR

INTERLOCKS

FEEDER BAY

BB189E

MAIN BUS-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

89-B

89-C

FOR 89-AE/BAY ISOLATOR OPERATION: 52-CB 89-L/BAY

OPEN

89-LE1

89-A/BAY

OPEN

89-L

89-B/BAY

OPEN

& OPERATION

89-AE/BAY

89-LE2

FEEDER OR ICT OR REACTOR OF BAY

89A/BAY

OPEN

89-B/BAY

OPEN

89-L/BAY

89-AE/BAY

OPEN

INTER LOCK CONTACTOR

INTERLOCKS

FEEDER BAY

BB189E

MAIN BUS-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

89-B

89-C

FOR 89-LE1/BAY ISOLATOR OPERATION: 52-CB 89-L/BAY

OPEN

89-LE1

89-A/BAY

OPEN

89-L

89-B/BAY

OPEN

& OPERATION

89-LE1/BAY

89-LE2

FEEDER OR ICT OR REACTOR OF BAY

89A/BAY

OPEN

89-B/BAY

OPEN

89-L/BAY

89-LE1/BAY

OPEN

INTER LOCK CONTACTOR

INTERLOCKS

FEEDER BAY

BB189E

MAIN BUS-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

89-B

89-C

FOR 89-LE2/BAY ISOLATOR OPERATION: 52-CB

89-LE1

89-L/BAY

OPEN

89-C/BAY

OPEN

LINE U/V 89-L

LV-89T

OPTD

& OPERATION

1-89LE2

(FOR LINE)

OPEN (FOR ICT)

89-LE2

FEEDER OR ICT OR REACTOR OF BAY

LV-89T

OPEN (FOR ICT)

LINE U/V

OPTD (FOR LINE)

89-C/BAY

OPEN

89-L/BAY

89-LE2

OPEN

INTER LOCK CONTACTOR

INTERLOCKS

FEEDER BAY

BB189E

MAIN BUS-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

52-CB

89-B

89-C

FOR 52 CB/BAY CIRCUIT BREAKER FOR REMOTE OPERATION: 1. 86-GA HSTR/MTR RESET CONDITION. 2. 86-GB HSTR/MTR RESET CONDITION. 3. 96-BB TBC HSTR/MTR RESET CONDITION.

89-LE1 89-L

86-GA 86-GB

89-LE2 96-BB

FEEDER OR ICT OR REACTOR OF BAY

RESET RESET

&

REMOTE OPERATION

52-CB/BAY

RESET

86-GA

86-GB

96-BB

52-CB/BAY

RESET

RESET

RESET

INTER LOCK CONTACTOR

INTERLOCKS

FEEDER BAY

BB189E

MAIN BUS-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

52-CB

89-B

89-C

FOR 52 CB /BAYCIRCUIT 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

89-LE2

89-LE1

FEEDER OR ICT OR REACTOR OF BAY

89A

OPEN

OPEN OPEN CLOSE

&

LOCAL 52-CB/BAY OPERATION

CLOSE

89L

89-AE

89-LE1

52-CB/BAY

OPEN

CLOSE

CLOSE

INTER LOCK CONTACTOR

INTERLOCKS

TBC BAY

BB189E

MAIN BUS-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

89-B

89-C

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. 5. 89-B/TBC ISOLATOR OPEN CONDITION

52-CB

89-CE BB189E

TRANSFER BUS COUPLER

52 CB / TBC 89-AE / TBC 89-CE / TBC 89-B / TBC 89-B/TBC

OPEN

BB189E

OPEN

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-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

89-B

89-C

FOR 89-B / 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. BB289E BUSEARTH SWITCH OPEN CONDITION. 5. 89-A/TBC ISOLATOR OPEN CONDITION

52-CB

89-CE BB289E

TRANSFER BUS COUPLER

52 CB / TBC 89-AE / TBC 89-CE / TBC 89-A / TBC 89-A/TBC

OPEN

BB289E

OPEN

OPEN OPEN OPEN OPEN

&

OPERATION

89B / TBC

OPEN

52 CB/TBC

89-AE/TBC

89-CE/TBC

89-B/TBC

OPEN

OPEN

OPEN

INTER LOCK CONTACTOR

INTERLOCKS

TBC BAY

BB189E

MAIN BUS-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

52-CB

89-B

89-C

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.

89-CE

BB389E

TRANSFER BUS COUPLER

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-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

52-CB

89-B

89-C

FOR 89-AE / TBC EARTH SWITCH OPERATION: 1. 89-A / TBC ISOLATOR OPEN CONDITION. 2. 89-B / TBC ISOLATOR OPEN CONDITION. 3. 89-C / TBC ISOLATOR OPEN CONDITION.

89-CE

TRANSFER BUS COUPLER

OPEN 89-A / TBC OPEN 89-B / TBC 89-C/TBC

89-A/TBC

OPEN

OPEN

&

OPERATION

89-AE / TBC

89-B/TBC

89-C/TBC

89-AE/TBC

OPEN

OPEN

INTER LOCK CONTACTOR

INTERLOCKS

TBC BAY

BB189E

MAIN BUS-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

52-CB

89-B

89-C

FOR 89-CE / TBC EARTH SWITCH OPERATION: 1. 89-A / TBC ISOLATOR OPEN CONDITION. 2. 89-B / TBC ISOLATOR OPEN CONDITION. 3. 89-C / TBC ISOLATOR OPEN CONDITION.

89-CE

TRANSFER BUS COUPLER

OPEN 89-A / TBC OPEN 89-B / TBC 89-C/TBC

89-A/TBC

OPEN

OPEN

&

OPERATION

89-CE / TBC

89-B/TBC

89-C/TBC

89-CE/TBC

OPEN

OPEN

INTER LOCK CONTACTOR

INTERLOCKS

TBC BAY

BB189E

MAIN BUS-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

52-CB

89-CE

TRANSFER BUS COUPLER

89-B

89-C

FOR 52 CB / TBC CIRCUIT BREAKER FOR REMOTE OPERATION: 1. 86-GA / TBC HSTR/MTR RESET CONDITION. 2. 86-GB / TBC HSTR/MTR RESET CONDITION. 3. 96-BB / TBC HSTR/MTR RESET CONDITION.

86-GA/TBC 86-GB/TBC 96-BB/TBC

RESET RESET

&

REMOTE OPERATION

52-CB/TBC

RESET

86-GA/TBC

86-GB/TBC

96-BB/TBC

52-CB/TBC

RESET

RESET

RESET

INTER LOCK CONTACTOR

INTERLOCKS

TBC BAY

BB189E

MAIN BUS-1(A) BB289E

MAIN BUS-2(B) BB389E

TRANSFER BUS( C ) 89-AE

89-A

52-CB

89-B

89-C

FOR 52 CB / TBC CIRCUIT BREAKER FOR LOCAL OPERATION: 1. 89-A / TBC ISOLATOR OPEN CONDITION. 2. 89-B / TBC ISOLATOR OPEN CONDITION. 3. 89-C / TBC ISOLATOR OPEN CONDITION. 4. 89-AE / TBC EARTH SWITCH CLOSED CONDITION. 5. 89-CE / TBC EARTH SWITCH CLOSED CONDITION.

89-CE 89-A/TBC

TRANSFER BUS COUPLER

89-B/TBC 89-C/ TBC 89-AE / TBC 89-CE / TBC 89A/TBC

89B/TBC

OPEN

OPEN

OPEN OPEN OPEN

&

LOCAL 52-CB / TBC OPERATION

CLOSE CLOSE

89C/TBC

89-AE/TBC

89-CE/TBC

52CB/TBC

OPEN

CLOSE

CLOSE

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-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

BAY - 1 1

1 - 89

ISO

BB189 E

O

189 AE

O

189 E

O

152 CB

O

2

1 – 89 E

ES

189 A

O

189

O

--

-

--

-

3

1 – 89 A

ISO

189 AE

O

189 E

O

152 CB

O

--

-

4

1 – 89 AE

ES

189 A

O

189

O

--

-

--

-

5

1 – 89 L

ISO

189 LE

O

152 CB

O

252 CB

O

--

-

6

1 – 89 LE

ES

189 L

O

UV RELAY

A

--

-

--

-

7

2 – 89 A

ISO

289 BE

O

289 AE

O

252 CB

O

--

-

8

2 – 89 AE

ES

289 B

O

289 A

O

--

-

--

-

9

2 – 89 B

ISO

289 BE

O

289 AE

O

252 CB

O

--

-

10

2 – 89 BE

ES

289 B

O

289 A

O

--

-

--

-

11

3 – 89

ISO

BB289 E

O

389 AE

O

389 E

O

352 CB

O

12

3 – 89 E

ES

389 A

O

389

O

--

-

--

-

13

3 – 89 A

ISO

389 AE

O

389 E

O

352 CB

O

--

-

14

3 – 89 AE

ES

389 A

O

389

O

--

-

--

-

15

3 – 89 T

ISO

LV89 E2

O

389 TE

O

252 CB

O

352 CB

O

16

3 – 89 TE

ES

389 T

O

LV89 T

O

--

-

--

-

BAY - 2

BAY - 3

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

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

ISOLATOR & CB INTERLOCKS

OPEN OPEN OPEN

& OPERATION

OPEN 1-89

1-89E

OPEN

1-89AE

OPEN

2-89AE

OPEN

& OPERATION

1-89A

2-89BE

OPEN 3-89E 3-89AE

OPEN OPEN

& OPERATION

86GR-A

1-89L

86GR-B

OPEN

96BB

2-89AE 2-89BE

CLOSE CLOSE

LOCAL CLOSE

& 1-52CB

CLOSE CLOSE

&

& 2-52CB

OPEN 3-89A

OPERATION

&

LOCAL CLOSE

& 3-52CB

RESET RESET

REMOTE CLOSE

& 1-52CB

OPEN

&

OPERATION

1-89E

86GR-A 86GR-B

OPEN OPEN

&

OPERATION

1-89AE

3-89T

OPERATION

ACTED

&

OPERATION

1-89LE

OPEN OPEN

86GR-A 96BB

OPEN

2-89B

& OPERATION 2-89A

RESET

REMOTE CLOSE

& 2-52CB

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

OPEN

OPEN

&

3-89AE

OPEN OPEN

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

OPEN 3-89E

OPERATION

&

OPEN

3-89 3-89A

OPEN 86GR-B

OPEN

RESET

OPEN

OPEN

RESET

BB289E

OPEN OPEN

LOCAL CLOSE

CLOSE CLOSE

3-89

OPERATION

OPEN

2-89A 2-52CB

OPEN

2-89A 2-89B

RESET RESET RESET

&

REMOTE CLOSE

3-89AE

3-52CB 3-89TE

OPERATION

OPERATION

&

OPEN OPEN

&

OPEN

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

OPEN OPEN

& OPERATION 2-89AE

OPEN OPEN

& OPERATION 2-89BE

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

OPEN OPEN OPEN

& OPERATION 2-89B