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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Rectifier Access

Scheme # 44
To prevent opening any rectifier enclosure door while the rectifier is operating.


Rectifier with DC output breaker. Any quantity of rectifier access doors can be accommodated.

Load break switch A and DC main breaker B are normally closed. Key A-1 is held in the L-O interlock on breaker B. Key A-2 is held in the L-O interlock on load break switch A. All D-1 keys are held in the transfer interlock. All rectifier enclosure access doors are locked closed.

 

1.
2.

3.

4.
5.


6.

7.

8.

 Open breaker B.
Turn key A-1 to lock the breaker in the open position. Key A-1 is now free.
Insert key A-1 in L-C interlock on load break switch A and turn to unlock.
Open load break switch A. Key A-1 is now held.
Turn key A-2 in L-O interlock on load break switch A and turn to lock the load break switch in the open position. Key A-2 is now free.
Insert key A-2 in the transfer interlock and turn. Key A-2 is now held and D-1 keys are free.
Insert D-1 keys in the L-C interlocks (Type D) on rectifier access doors.
Open the rectifier access doors to enter the rectifier enclosure. The D-1 keys are held in each door interlock as long as the door is open.

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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