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sriram1988
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Join Date: Sep 2011
Posts: 47
Good Answers: 2

Voltage Class of Breaker

10/06/2011 11:18 PM

What will the effect when a 12 Kv VCB is used on 11 kv line .Assume that the other criteria (such as Max breaking,making current..etc )are matching.
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Aseer
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Join Date: Oct 2009
Location: Dubai,UAE
Posts: 62
Good Answers: 2
#1

Re: Voltage class of Breaker

10/06/2011 11:35 PM

As 12Kv is higher than 11 Kv, so there will not be any issue of insulation failure due to extra voltage and If the other ratings are same such as ampere ratings and KA ratings then it can be used.

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sriram1988
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Join Date: Sep 2011
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#3
In reply to #1

Re: Voltage class of Breaker

10/07/2011 5:26 AM

thanks for your information
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electricalexpert65
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Join Date: Oct 2009
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#2

Re: Voltage class of Breaker

10/07/2011 3:45 AM

In fact, all 11kV VCBs are rated for 12kV only. 11kV is called its Nominal System Voltage and 12kV, the highest system voltage. So, inherently a 11kV VCB is deisgned to perform at 12kV also and vice versa.
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sriram1988
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#4
In reply to #2

Re: Voltage class of Breaker

10/07/2011 5:31 AM

thanks for your information
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