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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Isolating Switches and Breaker
or Regulator with By-Pass Switch
Scheme # 10
To prevent operation of disconnects A and B and by-pass disconnect C under load. Provides for closing of by-pass disconnect C before breaker circuit is opened, or permits breaker circuit to be opened with by-pass disconnect C remaining open.

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

Disconnects A and B and breaker D normally closed. By-pass disconnect C normally open. Keys A-1, A-2, and A-4 normally held in locks as indicated. Key A-3 normally free.

To transfer load from breaker and disconnects to by-pass switch:

1.

2.


3.

4.
5.

6.

7.
8.

9.

10.
11.

12.

13.
14.

15.
Obtain key A-3 which is free and insures that both
disconnects A and B are locked closed.
Insert key A-3 in L-C interlock on breaker D and turn
to lock closed. Key A-3 is held and key A-4 is
now free.
Insert key A-4 in L-O-C interlock on by-pass
disconnect C and turn to unlock. Key A-4 is now held.
Close by-pass disconnect C.
Turn key A-4 in L-O-C interlock on by-pass disconnect
C to lock closed. Key A-4 is now free.
Insert key A-4 in L-C interlock on breaker D and turn
to unlock. Key A-4 is held and key A-3 is now free.
Open breaker D.
Turn key A-1 in L-O interlock on breaker D to lock
open. Key A-1 is now free.
Insert keys A-1 and A-3 in L-C interlock on disconnect
A and turn to unlock. Keys A-1 and A-3 are now held.
Open disconnect A.
Turn key A-2 in L-O interlock on disconnect A to lock
open. 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-1 in L-O interlock on disconnect B to lock
open. Key A-1 is now free.
Insert key A-1 in L-O interlock on breaker D and turn
to unlock to permit operation during servicing.

To open disconnects A and B and breaker D, leaving by-pass disconnect C open:

1.

 Proceed from normal position with operations as in 7 to 15 above.

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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