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akhilgupta
Participant

Join Date: Sep 2009
Posts: 4

Air Circuit Breaker

12/09/2009 9:00 PM

WE HAVE ONE AIR CIRCUIT BREAKER 3200AMP MAKE GE IN FACTORY MAIN SUPPLY.WE SHOULD LIKE TO SET AT LOW RATING BECAUSE OUR FACTORY LOAD IS 800KVA IT IS POSSIBLE IN THIS CIRCUIT BREAKER.PLEASE SUGGEST IT.
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nascon
Commentator
India - Member - PROFESSIONAL Engineering Fields - Power Engineering - electrical planning - designing

Join Date: Sep 2007
Location: Ahmedbad, Gujarat
Posts: 97
Good Answers: 1
#1

Re: air circuit breaker

12/10/2009 2:01 AM

DEAR FRIEND,

YOU CAN USE IT BY RESETTING OF METERING/OC-SC-PROTCTION WITH CHANGE OF SUITABLE RATING CTS.
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electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#2

Re: air circuit breaker

12/10/2009 7:28 AM

Please let me know the CT Taps available & the range of the protection release settings.
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nascon
Commentator
India - Member - PROFESSIONAL Engineering Fields - Power Engineering - electrical planning - designing

Join Date: Sep 2007
Location: Ahmedbad, Gujarat
Posts: 97
Good Answers: 1
#3
In reply to #2

Re: air circuit breaker

12/16/2009 12:22 AM

dear friend

Assuming it is secondary of tr connected having 800 KVA, in this case at 415 v FL A shall be 1114.28Amp and you may opt near by ratio of cT say 1200/1 , 50 intanat over current relay /51 IDMT over current , 51 N Inverse time earth fault relay protection shall be adequate.

down stream and up steram protection needs to be relay cordinated
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