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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Prevent Paralleling of Lines
Scheme # 20
To prevent paralleling three power sources through a common tie bus not normally in service. To permit feeding any load bus from a second power source through the tie bus. To permit one power source to supply all three load busses through the tie bus.

Interlock Application Scheme # 20 - Preven Paralleling of Lines

Breakers A, B, and C are normally closed. Breakers D, E, and F are normally open. Under normal conditions keys A-1 and A-5 are held in breaker A interlock, keys A-2 and A-5 are held in breaker B interlock, and keys A-3 and A-5 are held in breaker C interlock.

To transfer load from line No. 1 to line No. 2 or line No. 3 through the tie bus, proceed as follows:

  1.
2.

3.

4.
5.

6.
Open breaker A.
Turn key A-1 in L-O interlock on breaker A to lock breaker open. Keys A-1 and A-5 are now free.
Insert key A-1 in L-O interlock on breaker D and turn to unlock. Key A-1 is now held.
Close breaker D.
Insert key A-5 in L-O interlock on either breaker E or F and turn to unlock. Key A-5 is now held.
Closer breaker E or F (whichever is selected).

Reverse sequence to restore load to line No. 1.

To transfer load from lines No. 1 and No. 2 to line No. 3 through tie bus, proceed as follows:

  1.
2.
3.

4.

5.
6.


7.
Close breaker D as per steps 1 to 4 above.
Open breaker B.
Turn key A-2 in L-O interlock on breaker B to lock breaker open. Keys A-2 and A-5 are now free.
Insert key A-2 in L-O interlock on breaker E and turn to unlock. Key A-2 is now held.
Close breaker E.
Insert one of the A-5 keys from either breaker A or B in L-O interlock on breaker F and turn to unlock. Key A-5 is now held.
Close breaker F.

Reverse sequence to restore load to lines No. 1 and No. 2.

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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