Current transformer application - Protection - Power Engineering

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Current transformer application

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curious

Joined:	Tue Sep 5th, 2006
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Posted: Tue Sep 5th, 2006 01:37 pm

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Why can't a current transformer intended for measuring purposes be used as a protection current transformer?

Luke Taylor

Joined:	Tue Sep 5th, 2006
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Posted: Tue Sep 5th, 2006 01:51 pm

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A current transformer (CT) designed for measuring purposes operates up to a specific rated value, over a range of currents. The rated limit and range of this transformer usually reflect the normal operating conditions of the circuit to which it is attached. A protection CT however is designed with a rating many times higher than normal operating conditions and an operating range that is much greater than a measuring CT. Under short-circuit conditions the CT response is very important and as such a protection CT must be used.

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