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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Rectifier Access

Scheme # 45
To prevent opening any rectifier enclosure door while the rectifier is operating and to prevent opening the negative disconnect switch under load.

Rectifier with incoming load break switch, DC output breaker and negative disconnect switch. Any quantity of rectifier access doors can be accommodated.

Load break switch A, DC main breaker B and negative disconnect switch N 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. Key N-1 and 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.


9.

10.

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 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. All D-1 keys and key N-1 are now 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.
Insert key N-1 in L-C interlock on the negative disconnect switch N and turn to unlock.
Open negative disconnect switch N. Key N-1 is now held.

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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