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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Isolating Switches and Breaker
or Regulator with By-Pass Switch
Scheme # 10A
To prevent operation of disconnect A and B and by-pass disconnect C under load. Permits by-pass disconnect C to operate only when regulator is in neutral position. Permits isolating regulator for servicing.

Interlock Application Scheme # 10A - Isolating Switches and Breaker or Regulator with By-Pass Switch

Disconnects A and B are normally closed. Regulator is normally in operation. By-pass disconnect C is normally open.

One key A-1 is held in regulator L-N (locked neutral) interlock and the second key A-1 is held in L-O interlock on disconnect A. Key A-2 is held in L-C interlock on disconnect C. Key A-3 is held in L-O interlock on disconnect B.

1.
2.

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12.

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Operate regulator to neutral position.
Turn key A-1 in L-N interlock on regulator to lock in neutral position. Key A-1 is now free.
Insert key A-1 in L-O interlock on by-pass disconnect C and turn to unlock. Key A-1 is now held.
Close by-pass disconnect C.
Turn key A-2 in L-C interlock on by-pass disconnect C to lock closed. Key A-2 is now free.
Insert key A-2 in L-C interlock on disconnect B and turn to unlock. Key A-2 is now held.
Open disconnect B.
Turn key A-3 in L-O interlock on disconnect B to lock open. Key A-3 is now free.
Insert key A-3 in L-C interlock on disconnect A and turn to unlock. Key A-3 is now held.
Open disconnect A.
Turn key A-1 in L-O interlock on disconnect A to lock open. Key A-1 is now free.
Insert key A-1 in regulator L-N interlock and turn to unlock. This permits regulator to be operated during inspection and servicing.


Reverse sequence to restore service.

Links for more interlock application scheme information:

Contents | Introduction | Symbols Legend | Scheme Book

Scheme # 25
Scheme # 26
Scheme # 27 Scheme # 28
Scheme # 29
Scheme # 30
Scheme # 31
Scheme # 32
Scheme # 33 Scheme # 34
Scheme # 35
Scheme # 35A
Scheme # 36

 Scheme # 37
Scheme # 38 Scheme # 39
Scheme # 40
Scheme # 41
Scheme # 42
Scheme # 42A
Scheme # 42B
Scheme # 43
Scheme # 43A
Scheme # 44
Scheme # 45
Scheme # 45A
 
   

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