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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Precipitator Access

Scheme # 42A
To allow operation of dual output transformer rectifiers with one field removed from service and to prevent opening any access doors of an electrostatic precipitator until all power supplies are de-energized and properly grounded.



CLICK ON IMAGE FOR LARGER VIEW


All main breakers in ESP control room are closed to supply all transformer rectifiers. All A keys (A-1, A-2, A-3, etc.) are held in L-O interlocks on the breakers. All transformer rectifiers are locked in the ON position. All K keys (K-1, K-2, etc.) are held in transfer blocks. All G keys (G-1, G-2, etc.) are held in L-C interlocks on the ground position of the transformer rectifiers. All access doors are locked closed and all access door keys are held in the transfer panel (key exchange box).

To ground one field of TR1, proceed as follows:

 

1.
2.

3.

 4.


5.
6.

7.




8.

9.

Open breaker A-1.
Turn key A-1 in L-O interlock to lock breaker in open position. Key A-1 is now free.
Insert key A-1 in the three-cylinder transfer block and turn. Key A-1 is now held and both K-1 keys are free.
Insert one K-1 key in L-C interlock on HV position of the field to be removed from service. Turn key to unlock. Key K-1 is now held.
Rotate TR handle to ground position.
Turn key G-1 in L-C interlock locking the TR handle in the ground position. Key G-1 is now free.
Insert key G-1 in the two-cylinder transfer block and turn. Key G-1 is now held and key K-1 is now free. Insert key K-1 in the three cylinder transfer block and turn. Both K-1 keys are now held and the A-1 key is free.
Insert key A-1 in L-O interlock on the breaker and turn to unlock. Key A-1 is now held.
Close breaker A-1.

Other fields can be removed from service in the same manner. Reverse sequence to restore service.

To open all access doors:

 

1.
2.

3.

 4.


5.


6.
7.


8.

9.



10.

Open breaker A-1.
Turn key A-1 in L-O interlock to lock breaker in the open position. Key A-1 is now free.
Lock open all other breakers and free all A keys (A-2, A-3, A-4, etc.).
Insert all A keys in their respective three-cylinder transfer blocks and turn. All A keys are now held and all K keys (K-1, K-2, K-3, etc.) are free.
Insert all K keys in the L-C interlocks on the HV position of each TR. Turn K keys to unlock. All K keys are now held.
Rotate all TR handles to the ground position.
Turn all G keys (G-1, G-2, G-3, etc.) in L-C interlocks of each TR to lock all TR handles in the ground position. All G keys are now free.
Insert all G keys in the transfer panel (key exchange box) and turn. All G keys are now held.
Turn and remove the D-1 keys from the transfer panel. Note: D-1 keys are secondary keys and cannot be removed until all primary keys (G keys) are inserted and turned.
Insert the D-1 keys in each access door interlock to be opened and turn to unlock. The D-1 keys will remain held in each access door
interlock as long as the door is open.

To restore service, close and lock all access doors, return all D-1 keys to the transfer panel and reverse the above sequence.

The scheme above represents basic guidelines regarding the proper interlock sequence for an Electro-Static Precipitator. The equipment that comprises an E.S.P., or Baghouse can vary depending upon the manufacturer and age of the equipment. Let us know your specific needs and we will be glad to provide a free proposal without obligation.

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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