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Question
why do we prefer VCB over OCB? what are the advantages of
Vaccum Ckt. Breaker over Oil Ckt. Breaker?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
It is because it has very good arc extinguishing properties.
and which helps it to extinguish arc more rapidly. even arc
takes place in them only at very high voltages as vaccum
medium does not allow arc to take place.

advantages of VCB over OCB.
1.GOOD MAKING AND BRAKING CAPACITY
2.DOES NOT ALLOW ARC TO TAKE PLACE AT LOW VOLTAGES.
3.LOW MAINTENACE
4.FUEL REGULATION IS NOT NEEDED AS IN OIL CB.
4.CAN USED AT ALL VOLTAGES.
5.EFFICIENT ARC INTERRUPTION CAPACITY
 
Is This Answer Correct ?    7 Yes 0 No
Amit Rajak
 
Answer
# 2
arc extinguish is more fastly than OCB 
Is This Answer Correct ?    1 Yes 0 No
Sithi
 
 
 

 
 
 
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actual rated capacity of a disc insulator?? Optcl 3
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if we convert Ampers into kva,which one formula use by us,pls tell me? ABB 9
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tell me the various standerd of CT ratio ICA 1
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when we supply in primary side of transformer then the supply goes in secondary side?how it works?   4
 
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