Iso Es Cb Interlocks

P. GOPALA KRISHNAADE/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 PRACTICE1. 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

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 IFi) 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.

ISOLATORS

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.

EARTH SWITCH

INTERLOCKS

SINGLE BUS & TRANSFER BUS SYSTEM

FEEDER1

BUS

TRANSFER BUS

FEEDER2

TRA

NSF

ER B

US

CO

UPL

ER

T/F-1 T/F-2

BAY1 BAY2 BAY3 BAY4 BAY5

INTERLOCKS

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE

89-L

52-CB

89-LE1

89-LE2

BB389E

BB189E

FEEDER OR

ICT OR

REACTOR

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.

89-A/BAY

INTERLOCK

CONTACTOR

89-LE1

OPEN

89-AE

OPEN

52 CB

OPEN

BB189E

OPEN

&

BB189EOPEN

OPEN52 CB/BAY

89-AE/BAYOPEN

OPEN

89A/BAYOPERATION

89-LE1/BAY

LINE BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE

89-L

52-CB

89-LE1

89-LE2

BB389E

BB189E

FEEDER OR

ICT OR

REACTOR

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.

89-L

INTERLOCK

CONTACTOR

89-LE1

OPEN

89-AE

OPEN

52 CB

OPEN

&

OPEN

OPEN52 CB

89-AEOPEN

OPEN

89LOPERATION89-LE1

89-LE2

89-LE2

OPEN

LINE BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE

89-L

52-CB

89-LE1

89-LE2

BB389E

BB189E

FEEDER OR

ICT OR

REACTOR

FOR 89-AE EARTH SWITCH OPERATION:1. 89-A ISOLATOR OPEN CONDITION.2. 89-L ISOLATOR OPEN CONDITION.

89-AE

INTERLOCK

CONTACTOR

89-A

OPEN

&OPEN

89-A

OPEN89-AEOPERATION

89-L

89-L

OPEN

LINE BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE

89-L

52-CB

89-LE1

89-LE2

BB389E

BB189E

FEEDER OR

ICT OR

REACTOR

FOR 89-LE1 EARTH SWITCH OPERATION:1. 89-A ISOLATOR OPEN CONDITION.2. 89-L ISOLATOR OPEN CONDITION.

89-LE1

INTERLOCK

CONTACTOR

89-A

OPEN

&OPEN

89-A

OPEN89-LE1OPERATION

89-L

89-L

OPEN

LINE BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE

89-L

52-CB

89-LE1

89-LE2

BB389E

BB189E

FEEDER OR

ICT OR

REACTOR

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.

89-LE2

INTERLOCK

CONTACTOR

89-L

OPEN

89-C

OPEN

U/V RELAY

OPTD

&

U/V RELAYOPTD

89-COPEN

OPEN

89-LE2OPERATION

89-L

LINE BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE

89-L

52-CB

89-LE1

89-LE2

BB389E

BB189E

FEEDER OR

ICT OR

REACTOR

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.

52-CB

INTERLOCK

CONTACTOR

96-BB

RESET

86-GB

RESET

86-GA

RESET

&

86-GARESET

86-GBRESET

RESET

52-CBREMOTEOPERATION

96-BB

LINE BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE

89-L

52-CB

89-LE1

89-LE2

BB389E

BB189E

FEEDER OR

ICT OR

REACTOR

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.

52CB

INTERLOCK

CONTACTOR

89-LE1

CLOSE

89-AE

CLOSE

89L

OPEN

89A

OPEN

&

89-A OPEN

OPEN89-L

89-AE CLOSE

CLOSE

52-CBLOCALOPERATION

89-LE1

LINE BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE

89-L

52-CB

89-LE1

89-LE2

BB389E

BB189E

FEEDER OR

ICT OR

REACTOR

FOR 89-C ISOLATOR OPERATION:1. NO OTHER ISOLATOR IS CLOSED TO TRANSFER BUS C2. BB389E EARTH SWITCH OPEN CONDITION.3. 89LE2 EARTH SWITCH OPEN CONDITION.4. 52 TBC CB IN OPEN CONDITION.

OR1. 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 C7. ADDITIONAL INTERLOCK PROTECTION TRANSFERRED

MAY ALSO PUT THROUGH PROTECTION TRANSFER SWITCH.

89-A

89-C

89-AE

52-CB

89-CE

TRANSFER BUS COUPLER

LINE BAY

INTERLOCKS

FOR LINE-1

89-C/ LINE-1

FOR LINE-2

89-C/ LINE-2

FOR ICT-1

89-C/ ICT-1

FOR ICT-2

89-C/ ICT-2

FUTU

RE

BA

YS

+ VE

+ VE

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.

LINE BAY

89-C/ LINE-1 89-C/ LINE2 89-C/ ICT-1 89-C/ ICT-2

89-LE2LINE-1

89-LE2LINE-2

89-TE2ICT-1

89-TE2ICT-2

INTERLOCKS

89-C/BAY

INTERLOCK

CONTACTOR

NO OTHER ISOLATOR CLOSED TOBUSBAR-C

CLOSE

BB389E

OPEN

89LE2

OPEN

52CB/TBC

OPEN


CLOSE

52CB/BAY

CLOSE CLOSE

89L/BAY

CLOSE

89A/BAY89-A/TBC

CLOSE CLOSE

89C/TBC

&

52CB/TBC OPEN

OPEN89-LE2

BB389E OPEN

CLOSENO OTHER ISOLATOR CLOSED TOBUSBAR-C

&52CB/BAY CLOSE

CLOSE89-A

89L CLOSE


89-A/TBC

89-C/TBC CLOSE

CLOSETTS TRANSFER OR

OPERATION 89-C/BAY

LINE BAY

.N TTTS

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE52-CB89-CE

BB389E

BB189E


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.

89-A/TBC

INTERLOCK

CONTACTOR

89-CE/TBC

OPEN

89-AE/TBC

OPEN

52 CB/TBC

OPEN

BB189E

OPEN

&

BB189EOPEN

OPEN52 CB / TBC

89-AE / TBCOPEN

OPEN

89A / TBCOPERATION

89-CE / TBC

TBC BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE52-CB89-CE

BB389E

BB189E


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-C/TBC

INTERLOCK

CONTACTOR

89-CE/TBC

OPEN

89-AE/TBC

OPEN

52 CB/TBC

OPEN

BB389E

OPEN

&

BB389EOPEN

OPEN52 CB / TBC

89-AE / TBCOPEN

OPEN

89C / TBCOPERATION

89-CE / TBC

TBC BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE52-CB89-CE

BB389E

BB189E


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

89-AE/TBC

INTERLOCK

CONTACTOR

89-A/TBC

OPEN

&OPEN

89-A / TBC

OPEN89-AE / TBCOPERATION

89-C/TBC

89-C/TBC

OPEN

TBC BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE52-CB89-CE

BB389E

BB189E


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

89-CE/TBC

INTERLOCK

CONTACTOR

89-A/TBC

OPEN

&OPEN

89-A / TBC

OPEN89-CE / TBCOPERATION

89-C/TBC

89-C/TBC

OPEN

TBC BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE52-CB89-CE

BB389E

BB189E


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.

52-CB/TBC

INTERLOCK

CONTACTOR

96-BB/TBC

RESET

86-GB/TBC

RESET

86-GA/TBC

RESET

&

86-GA/TBCRESET

86-GB/TBCRESET

RESET

52-CB/TBCREMOTEOPERATION

96-BB/TBC

TBC BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE52-CB89-CE

BB389E

BB189E


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.

52CB/TBC

INTERLOCK

CONTACTOR

89-CE/TBC

CLOSE

89-AE/TBC

CLOSE

89C/TBC

OPEN

89A/TBC

OPEN

&

89-A/TBC OPEN

OPEN89-C/ TBC

89-AE / TBC CLOSE

CLOSE

52-CB / TBCLOCALOPERATION

89-CE / TBC

TBC BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE

89-L

52-CB

89-LE1

89-LE2

BB389E

BB189E

FEEDER OR

ICT OR

REACTOR

FOR BB189E EARTH SWITCH OPERATION:1. ALL BAYS BUS-A ISOLATORS OPEN CONDITION

89-A

89-C

89-AE

52-CB

89-CE


&

89-A/BAY1 OPEN

OPEN

OPEN

BB189EOPERATION89-A/BAY2

89-A/BAYn

UP TO NO OF BAYS

BB189E

INTERLOCK

CONTACTOR

89-A / BAY n

OPEN

89-A/BAY2

OPEN

89-A /BAY1

OPENUP TO NO OF BAYS

BUS BAY

MAIN BUS(A)

TRANSFER BUS( C )

INTERLOCKS

89-A89-C

89-AE

89-L

52-CB

89-LE1

89-LE2

BB389E

BB189E

FEEDER OR

ICT OR

REACTOR

FOR BB389E EARTH SWITCH OPERATION:1. ALL BAYS BUS-C ISOLATORS OPEN CONDITION

89-A

89-C

89-AE

52-CB

89-CE


&

89-C/BAY1 OPEN

OPEN

OPEN

BB389EOPERATION89-C/BAY2

89-C/BAYn

UP TO NO OF BAYS

BB389E

INTERLOCK

CONTACTOR

89-C / BAY n

OPEN

89-C/BAY2

OPEN

89-C /BAY1


BUS BAY

INTERLOCKS

DOUBLE MAIN BUS & TRANSFER BUS SYSTEM

FEEDER1

BUS-2

BUS-1

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

INTERLOCKS

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

89-L

52-CB

89-LE1

89-LE2

BB289E

BB189E

FEEDER OR

ICT OR

REACTOROF BAY

BB389E

MAIN BUS-2(B)

89-A

FEEDER BAY

89-A/BAY

INTERLOCK

CONTACTOR

BB189E

OPEN

89-AE/BAY

OPEN

89LE1/BAY

OPEN

52CB/BAY

OPEN

89-A/BC

CLOSE

52 CB/BC

CLOSE

89-B/BC

CLOSE

89-B/BAY

OPEN

52CB/BAY

CLOSE

89-B/BAY

CLOSE

&

52CB/BAY OPEN

OPEN89-LE1/BAY

89-AE/BAY OPEN

OPEN

&52CB/BAY CLOSE

CLOSE89-A/BC

89-B/BC CLOSE

CLOSE

89-B/BAY CLOSE

OR &

52CB/TBC

89-B/BAY

BB189EOPEN

89-A/BAYOPERATION

FOR 89-A/BAY ISOLATOR OPERATION:

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

89-L

52-CB

89-LE1

89-LE2

BB289E

BB189E

FEEDER OR

ICT OR

REACTOROF BAY

BB389E

MAIN BUS-2(B)

89-A

FEEDER BAY

89-B/BAY

INTERLOCK

CONTACTOR

BB289E

OPEN

89-AE/BAY

OPEN

89LE1/BAY

OPEN

52CB/BAY

OPEN

89-A/BAY

CLOSE

52 CB/BC

CLOSE

89-B/BC

CLOSE

89-A/BAY

OPEN

52CB/BAY

CLOSE

89-A/BC

CLOSE

&

52CB/BAY OPEN

OPEN89-LE1/BAY

89-AE/BAY OPEN

OPEN

&52CB/BAY CLOSE

CLOSE89-A/BC

89-B/BC CLOSE

CLOSE

89-A/BAY CLOSE

OR &

52CB/TBC

89-A/BAY

BB289EOPEN

89-B/BAYOPERATION

FOR 89-B/BAY ISOLATOR OPERATION:

INTERLOCKS

89-C/BAY

INTERLOCK

CONTACTOR


CLOSE

BB389E

OPEN

89LE2

OPEN

52CB/TBC

OPEN


CLOSE

52CB/BAY

CLOSE CLOSE

89L/BAY

CLOSE

89A/BAY89-A/TBC

CLOSE CLOSE

89C/TBC

&

52CB/TBC OPEN

OPEN89-LE2/BAY

BB389E OPEN


&52CB/BAY CLOSE

89L/BAY CLOSE


89-C/TBC CLOSETTS TRANSFER OR

OPERATION 89-C/BAY

FEEDER BAY

&

CLOSE

89B/BAY

CLOSE

89B/TBC

CLOSE89-B/TBC

89-B/BAY CLOSE

&CLOSE89-A/TBC

89-A/BAY CLOSE

OR

.N TTTS

FOR 89-C/BAY ISOLATOR OPERATION:

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

89-L

52-CB

89-LE1

89-LE2

BB289E

BB189E

FEEDER OR

ICT OR

REACTOROF BAY

BB389E

MAIN BUS-2(B)

89-A

FEEDER BAY

FOR 89-L/BAY ISOLATOR OPERATION:

&

OPEN

OPEN52 CB/BAY

OPEN

OPEN

89L/BAYOPERATION89-LE1/BAY

89-LE2/BAY

89-L

INTERLOCK

CONTACTOR

89-LE1/BAY

OPEN

89-AE/BAY

OPEN

ICT HV TE

OPEN

89-LE2/BAY

OPEN

89-AE/BAYOPENICT HV TE

(FOR ICT ONLY)

52 CB/BAY

OPEN(FOR ICT ONLY)

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

89-L

52-CB

89-LE1

89-LE2

BB289E

BB189E

FEEDER OR

ICT OR

REACTOROF BAY

BB389E

MAIN BUS-2(B)

89-A

FEEDER BAY

FOR 89-AE/BAY ISOLATOR OPERATION:

&

OPEN89-L/BAY

89-A/BAY OPEN

OPEN

89-AE/BAYOPERATION

89-B/BAY

89-AE/BAY

INTERLOCK

CONTACTOR

89A/BAY

OPEN

89-L/BAY

OPEN

89-B/BAY

OPEN

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

89-L

52-CB

89-LE1

89-LE2

BB289E

BB189E

FEEDER OR

ICT OR

REACTOROF BAY

BB389E

MAIN BUS-2(B)

89-A

FEEDER BAY

FOR 89-LE1/BAY ISOLATOR OPERATION:

&

OPEN89-L/BAY

89-A/BAY OPEN

OPEN

89-LE1/BAYOPERATION

89-B/BAY

89-LE1/BAY

INTERLOCK

CONTACTOR

89A/BAY

OPEN

89-L/BAY

OPEN

89-B/BAY

OPEN

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

89-L

52-CB

89-LE1

89-LE2

BB289E

BB189E

FEEDER OR

ICT OR

REACTOROF BAY

BB389E

MAIN BUS-2(B)

89-A

FEEDER BAY

FOR 89-LE2/BAY ISOLATOR OPERATION:

&89-L/BAY OPEN

OPEN89-C/BAY

LINE U/V OPTD

OPEN

1-89LE2OPERATION

LV-89T

89-LE2

INTERLOCK

CONTACTOR

LINE U/V

OPTD

LV-89T

OPEN

89-L/BAY

OPEN

89-C/BAY

OPEN

(FOR ICT)

(FOR LINE)

(FOR ICT) (FOR LINE)

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

89-L

52-CB

89-LE1

89-LE2

BB289E

BB189E

FEEDER OR

ICT OR

REACTOROF BAY

BB389E

MAIN BUS-2(B)

89-A

FEEDER BAY

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.

52-CB/BAY

INTERLOCK

CONTACTOR

96-BB

RESET

86-GB

RESET

86-GA

RESET

&

86-GARESET

86-GBRESET

RESET

52-CB/BAYREMOTEOPERATION

96-BB

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

89-L

52-CB

89-LE1

89-LE2

BB289E

BB189E

FEEDER OR

ICT OR

REACTOROF BAY

BB389E

MAIN BUS-2(B)

89-A

FEEDER BAY

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.

52-CB/BAY

INTERLOCK

CONTACTOR

89-LE1

CLOSE

89-AE

CLOSE

89L

OPEN

89A

OPEN

&

89-A OPEN

OPEN89-L

89-AE CLOSE

CLOSE

52-CB/BAYLOCALOPERATION

89-LE1

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

52-CB

89-CE

BB289E

BB189E

TRANSFER BUS

COUPLER

BB389E

MAIN BUS-2(B)

89-A

TBC BAY

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

89-A/TBC

INTERLOCK

CONTACTOR

89-CE/TBC

OPEN

89-AE/TBC

OPEN

52 CB/TBC

OPEN

BB189E

OPEN

&

BB189EOPEN

OPEN52 CB / TBC

89-AE / TBCOPEN

OPEN89A / TBCOPERATION

89-CE / TBCOPEN89-B / TBC

89-B/TBC

OPEN

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

52-CB

89-CE

BB289E

BB189E

TRANSFER BUS

COUPLER

BB389E

MAIN BUS-2(B)

89-A

TBC BAY

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

89-B/TBC

INTERLOCK

CONTACTOR

89-CE/TBC

OPEN

89-AE/TBC

OPEN

52 CB/TBC

OPEN

BB289E

OPEN

&

BB289EOPEN

OPEN52 CB / TBC

89-AE / TBCOPEN

OPEN89B / TBCOPERATION

89-CE / TBCOPEN89-A / TBC

89-A/TBC

OPEN

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

52-CB

89-CE

BB289E

BB189E

TRANSFER BUS

COUPLER

BB389E

MAIN BUS-2(B)

89-A

TBC BAY

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-C/TBC

INTERLOCK

CONTACTOR

89-CE/TBC

OPEN

89-AE/TBC

OPEN

52 CB/TBC

OPEN

BB389E

OPEN

&

BB389EOPEN

OPEN52 CB / TBC

89-AE / TBCOPEN

OPEN

89C / TBCOPERATION

89-CE / TBC

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

52-CB

89-CE

BB289E

BB189E

TRANSFER BUS

COUPLER

BB389E

MAIN BUS-2(B)

89-A

TBC BAY

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-AE/TBC

INTERLOCK

CONTACTOR

89-B/TBC

OPEN

&OPEN

89-A / TBC

OPEN89-AE / TBCOPERATION

89-C/TBC

89-C/TBC

OPEN

OPEN89-B / TBC

OPEN

89-A/TBC

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

52-CB

89-CE

BB289E

BB189E

TRANSFER BUS

COUPLER

BB389E

MAIN BUS-2(B)

89-A

TBC BAY

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/TBC

INTERLOCK

CONTACTOR

89-B/TBC

OPEN

&OPEN

89-A / TBC

OPEN89-CE / TBCOPERATION

89-C/TBC

89-C/TBC

OPEN

OPEN89-B / TBC

OPEN

89-A/TBC

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

52-CB

89-CE

BB289E

BB189E

TRANSFER BUS

COUPLER

BB389E

MAIN BUS-2(B)

89-A

TBC BAY

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.

52-CB/TBC

INTERLOCK

CONTACTOR

96-BB/TBC

RESET

86-GB/TBC

RESET

86-GA/TBC

RESET

&

86-GA/TBCRESET

86-GB/TBCRESET

RESET

52-CB/TBCREMOTEOPERATION

96-BB/TBC

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

52-CB

89-CE

BB289E

BB189E

TRANSFER BUS

COUPLER

BB389E

MAIN BUS-2(B)

89-A

TBC BAY

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.

52CB/TBC

INTERLOCK

CONTACTOR

89-CE/TBC

CLOSE

89-AE/TBC

CLOSE

89C/TBC

OPEN

89B/TBC

OPEN

&

89-A/TBC OPEN

OPEN89-C/ TBC

89-AE / TBC CLOSE

CLOSE

52-CB / TBCLOCALOPERATION

89-CE / TBC

89-B/TBCOPEN

89A/TBC

OPEN

MAIN BUS-1(A)

INTERLOCKS

89-A 89-B

89-AE 52-CB 89-BE

BB289E

BB189E

BUS COUPLER

BC BAY

MAIN BUS-2(B)

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.

89-A/BC

INTERLOCK

CONTACTOR

89-BE/BC

OPEN

89-AE/BC

OPEN

52 CB/BC

OPEN

BB189E

OPEN

&

BB189EOPEN

OPEN52 CB / BC

89-AE / BCOPEN

OPEN

89A / BCOPERATION

89-BE / BC

MAIN BUS-1(A)

INTERLOCKS

89-A 89-B

89-AE 52-CB 89-BE

BB289E

BB189E

BUS COUPLER

BC BAY

MAIN BUS-2(B)

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.

89-B/BC

INTERLOCK

CONTACTOR

89-BE/BC

OPEN

89-AE/BC

OPEN

52 CB/BC

OPEN

BB289E

OPEN

&

BB289EOPEN

OPEN52 CB / BC

89-AE / BCOPEN

OPEN

89B / BCOPERATION

89-BE / BC

MAIN BUS-1(A)

INTERLOCKS

89-A 89-B

89-AE 52-CB 89-BE

BB289E

BB189E

BUS COUPLER

BC BAY

MAIN BUS-2(B)

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

89-AE/BC

INTERLOCK

CONTACTOR

89-A/BC

OPEN

&OPEN

89-A / TBC

OPEN89-AE / BCOPERATION

89-B/TBC

89-B/BC

OPEN

MAIN BUS-1(A)

INTERLOCKS

89-A 89-B

89-AE 52-CB 89-BE

BB289E

BB189E

BUS COUPLER

BC BAY

MAIN BUS-2(B)

FOR 89-BE / BC EARTH SWITCH OPERATION:1. 89-A / BC ISOLATOR OPEN CONDITION.2. 89-B / BC ISOLATOR OPEN CONDITION.

89-BE/BC

INTERLOCK

CONTACTOR

89-A/BC

OPEN

&OPEN

89-A / BC

OPEN89-BE / BCOPERATION

89-B/BC

89-B/BC

OPEN

MAIN BUS-1(A)

INTERLOCKS

89-A 89-B

89-AE 52-CB 89-BE

BB289E

BB189E

BUS COUPLER

BC BAY

MAIN BUS-2(B)

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.

52-CB/BC

INTERLOCK

CONTACTOR

96-BB/BC

RESET

86-GB/BC

RESET

86-GA/BC

RESET

&

86-GA/BCRESET

86-GB/BCRESET

RESET

52-CB/BCREMOTEOPERATION

96-BB/BC

MAIN BUS-1(A)

INTERLOCKS

89-A 89-B

89-AE 52-CB 89-BE

BB289E

BB189E

BUS COUPLER

BC BAY

MAIN BUS-2(B)

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.

52CB/BC

INTERLOCK

CONTACTOR

89-BE/BC

CLOSE

89-AE/BC

CLOSE

89B/BC

OPEN

&

89-A/BC OPEN

89-AE/BC CLOSE

CLOSE

52-CB / BCLOCALOPERATION

89-BE/BC

89-B/BCOPEN

89A/BC

OPEN

MAIN BUS-1(A)

TRANSFER BUS( C )

INTERLOCKS

89-B 89-C89-AE

89-L

52-CB

89-LE1

89-LE2

BB289E

BB189E

FEEDER OR

ICT OR

REACTOROF BAY

BB389E

MAIN BUS-2(B)

89-A

BUS ES

89-B

89-AE 52-CB 89-BE

BUS COUPLER

89-A89-B 89-C

52-CB

89-CE

TRANSFER BUS

COUPLER

89-A89-AE

INTERLOCKS BUS EARTH SWITCH

&

89-A/BAY1 OPEN

OPEN

OPEN

BB189EOPERATION

89-A/BAY2

89-A/BAYn

UP TO NO OF BAYS &

89-B/BAY1 OPEN

OPEN

OPEN

BB289EOPERATION

89-B/BAY2

89-B/BAYn

UP TO NO OF BAYS &

89-C/BAY1 OPEN

OPEN

OPEN

BB389EOPERATION

89-C/BAY2

89-C/BAYn

UP TO NO OF BAYS

BB189E BB289E BB389E

BB189E

INTERLOCK

CONTACTOR

89-A / BAY n

OPEN

89-A/BAY2

OPEN

89-A /BAY1


BB289E

INTERLOCK

CONTACTOR

89-B / BAY n

OPEN

89-B/BAY2

OPEN

89-B /BAY1


BB389E

INTERLOCK

CONTACTOR

89-C / BAY n

OPEN

89-C/BAY2

OPEN

89-C /BAY1


FOR BUS EARTH SWITCH OPERATION, ALL ISOLATORS CONNECTED TO CONCERNED BUS ARE TO BE OPENED.

INTERLOCKS

I-CONFIGUARATION

FEEDER2 FEEDER4 FEEDER6 FEEDER8 FEEDER10 FEEDER12


BUS-2

BUS-1

BA

Y1B

AY2

BA

Y3

BA

Y4B

AY5

BA

Y6

BA

Y7B

AY8

BA

Y9

BA

Y10

BA

Y11

BA

Y12

BA

Y13

BA

Y14

BA

Y15

BA

Y16

BA

Y17

BA

Y18

DIA1 DIA2 DIA3 DIA4 DIA5 DIA6

INTERLOCKS

D-CONFIGUARATION

BUS-2

BUS-1



BA

Y1

BAY2

BA

Y3

BA

Y4

BAY5

BA

Y6

BA

Y7

BAY8

BA

Y9

BA

Y10

BAY11B

AY1

2

BA

Y13

BAY14

BA

Y15

BA

Y16

BAY17

BA

Y18

DIA1

DIA2

DIA3

DIA4

DIA5

DIA6

INTERLOCKS

ONE & HALF BREAKER SYSTEM

LINE 1

1-89

1-89A

1-52CB

3-89

3-89A

3-52CB

2-52CB

2-89A 2-89B

1-89L 3-89T

BUS-1 BUS-2

T/F-1

UUUU UU

LINESHUNT

REACTOR .1-PH NEUTRAL GROUNDING

REACTOR

INTERLOCKS

BB1-89E BB2-89E

1-89E

1-89AE 3-89AE

2-89AE 2-89BE

3-89E

1-89LE 3-89TE

1-89R1-89RE

LINE 1

1-89

1-89A

1-52CB

1-89L

BUS-1UUU

U UULI

NE

SHU

NT

REA

CTO

R

.

INTERLOCKS

BB1-89E

1-89E

1-89AE

1-89LE

1-89R1-89RE

BAY 1

&BB189E OPEN

OPEN1-89AE

1-89E OPENOPEN

1-89OPERATION

1-52CB

1-89

INTERLOCK

CONTACTOR

1-89AE

OPEN

BB189E

OPEN

1-52 CB

OPEN

1-89E

OPEN

FOR 1-89 ISOLATOR OPERATION:

LINE 1

1-89

1-89A

1-52CB

1-89L

BUS-1UUU

U UULI

NE

SHU

NT

REA

CTO

R

.

INTERLOCKS

BB1-89E

1-89E

1-89AE

1-89LE

1-89R1-89RE

BAY 1

&OPEN

1-89A

1-89 OPEN1-89E

OPERATION

1-89E

INTERLOCK

CONTACTOR

1-89A

OPEN

1-89

OPEN

FOR 1-89E ISOLATOR OPERATION:

LINE 1

1-89

1-89A

1-52CB

1-89L

BUS-1UUU

U UULI

NE

SHU

NT

REA

CTO

R

.

INTERLOCKS

BB1-89E

1-89E

1-89AE

1-89LE

1-89R1-89RE

BAY 1

&

OPEN1-89AE

1-89E OPEN

OPEN

1-89AOPERATION

1-52CB

1-89A

INTERLOCK

CONTACTOR

1-89AE

OPEN

1-52 CB

OPEN

1-89E

OPEN

FOR 1-89A ISOLATOR OPERATION:

LINE 1

1-89

1-89A

1-52CB

1-89L

BUS-1UUU

U UULI

NE

SHU

NT

REA

CTO

R

.

INTERLOCKS

BB1-89E

1-89E

1-89AE

1-89LE

1-89R1-89RE

BAY 1

FOR 1-89AE EARTH SWITCH OPERATION:

&OPEN

1-89A

1-89 OPEN1-89AE

OPERATION

1-89AE

INTERLOCK

CONTACTOR

1-89A

OPEN

1-89

OPEN

LINE 1

1-89

1-89A

1-52CB

1-89L

BUS-1UUU

U UULI

NE

SHU

NT

REA

CTO

R

.

INTERLOCKS

BB1-89E

1-89E

1-89AE

1-89LE

1-89R1-89RE

BAY 1

&OPEN2-52CB

1-89LE OPENOPEN

1-89LOPERATION

1-52CB

1-89L

INTERLOCK

CONTACTOR

2-52 CB

OPEN

1-89R

CLOSE

1-52 CB

OPEN

1-89LE

OPEN

FOR 1-89L ISOLATOR OPERATION:

1-89R CLOSEPUSHDC

INTERLOCK BYPASS

PB

OR

IL

INTER LOCK FACILITY:WHEN 1-89R CLOSES ONLY

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

PERMIT TO OPEN 1-89R.

DC INTERLOCK BYPASS PB

PUSH

IL

LINE 1

1-89

1-89A

1-52CB

1-89L

BUS-1UUU

U UULI

NE

SHU

NT

REA

CTO

R

.

INTERLOCKS

BB1-89E

1-89E

1-89AE

1-89LE

1-89R1-89RE

BAY 1

&OPEN

1-89L

LINE U/V RELAY OPTD1-89LE

OPERATION

1-89LE

INTERLOCK

CONTACTOR

LINE U/V RELAY

OPTD

1-89L

OPEN

FOR 1-89LE EARTH SWITCH OPERATION:

LINE 1

1-89

1-89A

1-52CB

1-89L

BUS-1UUU

U UULI

NE

SHU

NT

REA

CTO

R

.

INTERLOCKS

BB1-89E

1-89E

1-89AE

1-89LE

1-89R1-89RE

BAY 1

&OPEN2-52CB

1-89L OPENOPEN

1-89LOPERATION

1-52CB

1-89L

INTERLOCK

CONTACTOR

2-52 CB

OPEN

1-52 CB

OPEN

1-89LE

OPEN

FOR 1-89R ISOLATOR OPERATION:

1-89RE OPEN

IL

1-89RE

OPEN

LINE 1

1-89

1-89A

1-52CB

1-89L

BUS-1UUU

U UULI

NE

SHU

NT

REA

CTO

R

.

INTERLOCKS

BB1-89E

1-89E

1-89AE

1-89LE

1-89R1-89RE

BAY 1

OPEN1-89R 1-89RE

OPERATION

1-89RE

INTERLOCK

CONTACTOR

1-89R

OPEN

FOR 1-89RE EARTH SWITCH OPERATION:

INTERLOCKS BAY1

REMOTE

1-52 CB

LOCAL

1-52 CB

INTERLOCK

CONTACTOR

1-89 E

CLOSE

1-89 AE

CLOSE

&1-89E

CLOSE

CLOSE

1-52 CBLOCALOPERATION

1-89AE

LINE 1

1-89

1-89A

1-52CB

1-89L

BUS-1UUU

UUULI

NE

SHU

NT

REA

CTO

R

.

BB1-89E

1-89E

1-89AE

1-89LE

1-89R1-89RE

1-52 CB

INTERLOCK

CONTACTOR

96-BB/BAY1

RESET

86-GB/BAY1

RESET

86-GA/BAY1

RESET

&

86-GA/BAY1RESET

86-GB/BAY1RESET

RESET

1-52 CBREMOTEOPERATION

96-BB/BAY1

2-52CB

2-89A 2-89B

INTERLOCKS

2-89AE 2-89BE

BAY 2

2-89A

INTERLOCK

CONTACTOR

289-BE

OPEN

289-AE

OPEN

2-52 CB

OPEN

&

OPEN2-52 CB

289-AEOPEN

OPEN

2-89AOPERATION

289-BE


2-52CB

2-89A 2-89B

INTERLOCKS

2-89AE 2-89BE

BAY 2

2-89B

INTERLOCK

CONTACTOR

289-BE

OPEN

289-AE

OPEN

2-52 CB

OPEN

&

OPEN2-52 CB

289-AEOPEN

OPEN

2-89BOPERATION

289-BE

FOR 2-89B ISOLATOR OPERATION:

2-52CB

2-89A 2-89B

INTERLOCKS

2-89AE 2-89BE

BAY 2

2-89AE

INTERLOCK

CONTACTOR

289-B

OPEN

289-A

OPEN

&289-A

OPEN

OPEN2-89AEOPERATION

289-B


2-52CB

2-89A 2-89B

INTERLOCKS

2-89AE 2-89BE

BAY 2

2-89BE

INTERLOCK

CONTACTOR

289-B

OPEN

289-A

OPEN

&289-A

OPEN

OPEN2-89BEOPERATION

289-B

FOR 2-89BE EARTH SWITCH OPERATION:

INTERLOCKS BAY2

REMOTE

2-52 CB

LOCAL

2-52 CB

INTERLOCK

CONTACTOR

2-89 BE

CLOSE

2-89 AE

CLOSE

&2-89BE

CLOSE

CLOSE


2-89AE

2-52 CB

INTERLOCK

CONTACTOR

96-BB/BAY2

RESET

86-GB/BAY2

RESET

86-GA/BAY2

RESET

&

86-GA/BAY2RESET

86-GB/BAY2RESET

RESET


96-BB/BAY2

2-52CB

2-89A 2-89B

2-89AE 2-89BE

FOR HALF DIA ONLY

FOR HALF DIA ONLY

3-89

3-89A

3-52CB

3-89T

BUS-2

INTERLOCKSBB2-89E

3-89E

3-89AE

3-89TE

&BB289E OPEN

OPEN3-89AE

3-89E OPENOPEN

3-89OPERATION

3-52CB

3-89

INTERLOCK

CONTACTOR

3-89AE

OPEN

BB289E

OPEN

3-52 CB

OPEN

3-89E

OPEN

FOR 3-89 ISOLATOR OPERATION:

BAY 3

ICT

INTERLOCKS BAY 3

&OPEN

3-89A

3-89 OPEN3-89E

OPERATION

3-89E

INTERLOCK

CONTACTOR

3-89A

OPEN

3-89

OPEN

FOR 3-89E EARTH SWITCH OPERATION:

3-89

3-89A

3-52CB

3-89T

BUS-2BB2-89E

3-89E

3-89AE

3-89TE

ICT

3-89

3-89A

3-52CB

3-89T

BUS-2

INTERLOCKSBB2-89E

3-89E

3-89AE

3-89TE

&OPEN

3-89AE

3-89E OPENOPEN

3-89AOPERATION

3-52CB

3-89A

INTERLOCK

CONTACTOR

3-89AE

OPEN

3-52 CB

OPEN

3-89E

OPEN


BAY 3

ICT

INTERLOCKS BAY 3

&OPEN

3-89A

3-89 OPEN3-89AE

OPERATION

3-89AE

INTERLOCK

CONTACTOR

3-89A

OPEN

3-89

OPEN


3-89

3-89A

3-52CB

3-89T

BUS-2BB2-89E

3-89E

3-89AE

3-89TE

ICT

3-89

3-89A

3-52CB

3-89T

BUS-2

INTERLOCKSBB2-89E

3-89E

3-89AE

3-89TE

&LV89TE2 OPEN

OPEN2-52 CB

3-89TE OPENOPEN

3-89TOPERATION

3-52CB

3-89T

INTERLOCK

CONTACTOR

2-52CB

OPEN

LV89TE2

OPEN

3-52 CB

OPEN

3-89TE

OPEN

FOR 3-89T ISOLATOR OPERATION:

BAY 3

ICT

INTERLOCKS BAY 3

&OPEN

3-89T

LV89T OPEN3-89TE

OPERATION

3-89TE

INTERLOCK

CONTACTOR

3-89T

OPEN

LV89T

OPEN

FOR 3-89TE EARTH SWITCH OPERATION:

3-89

3-89A

3-52CB

3-89T

BUS-2BB2-89E

3-89E

3-89AE

3-89TE

ICT

INTERLOCKS BAY3

REMOTE

3-52 CB

LOCAL

3-52 CB

INTERLOCK

CONTACTOR

3-89 E

CLOSE

3-89 AE

CLOSE

&3-89E

CLOSE

CLOSE


3-89AE

3-52 CB

INTERLOCK

CONTACTOR

96-BB/BAY3

RESET

86-GB/BAY3

RESET

86-GA/BAY3

RESET

&

86-GA/BAY3RESET

86-GB/BAY3RESET

RESET


96-BB/BAY3

3-89

3-89A

3-52CB

3-89T

BUS-2BB2-89E

3-89E

3-89AE

3-89TE

ICT

INTERLOCKS BUS EARTH SWITCH

FOR BUS EARTH SWITCH OPERATION, ALL ISOLATORS

CONNECTED TO CONCERNED BUS ARE TO BE OPENED.

&

3-89/ DIA1 OPEN

BB289EOPERATION

UP TO NO OF DIAS

BB289E

6-89/ DIA2 OPEN

9-89/ DIA3 OPEN

DIA N OPEN

&

1-89/ DIA1 OPEN

BB189EOPERATION

UP TO NO OF DIAS

BB189E

4-89/ DIA2 OPEN

7-89/ DIA3 OPEN

DIA N OPEN

BB189E

INTERLOCK

CONTACTOR

DIA N

OPEN

7-89/DIA3

OPEN

4-89/DIA2

OPENUP TO NO OF DIAS

BB289E

INTERLOCK

CONTACTOR

DIA N

OPEN

9-89/DIA3

OPEN

6-89/DIA2


1-89/DIA1

OPEN

3-89/DIA1

OPEN

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

Documents

Iso Es Cb Interlocks