Interlock Application Scheme # 38 - Capacitor Bank Access

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Interlock Application - Capacitor Bank Access

Scheme # 38
To prevent closing ground switch B under load and to enable access to the capacitor bank enclosure only after the capacitor bank has been grounded and discharged.

Breaker A is closed. Ground switch B is locked open. All capacitor bank enclosure doors are locked closed. Key A-1 is held in L-O interlock on breaker A. Key A-2 is held in Time Delay Key Release Unit (TDKRU). Key A-3 is held in L-C interlock on ground switch B. Key A-4 is held in L-C interlock (Type M2D) on access door #1.

To gain access to capacitor bank enclosure, proceed as follows:

1.
2.

3.

4.

5.

6.

7.

8.

9.

10.

Open breaker A.
Turn key A-1 in L-O interlock on breaker A to lock open. Key A-1 is now free.
Insert Key A-1 in initiating lock on TDKRU. Turn key to start time delay action.
Signal light energized and key A-2 can be removed after the prescribed time period. Key A-1 is now held.
Insert key A-2 in L-O interlock on ground switch B and turn to unlock. Close ground switch B. Key A-2 is now held.
Turn key A-3 in L-C interlock on ground switch B to lock closed. Key A-3 is now free.
Insert key A-3 in L-C interlock (Type M2D) on capacitor bank enclosure access door #1 and turn to unlock. Key A-3 is now held and key A-4 is now free.
Open access door #1 to enter capacitor bank enclosure.
Insert key A-4 in L-C interlock (Type D) on access door #2 and turn to unlock. Key A-4 is now held.
Open access door #2 to enter capacitor bank enclosure.

Reverse sequence to restore service.

Links for more interlock application scheme information:

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