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Sheth
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Join Date: Sep 2011
Posts: 2

CT Class

10/20/2011 7:06 AM

What is meant by 0.2Fs5 class CT?
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zamanengineer001
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Join Date: Sep 2011
Posts: 26
#1

Re: CT Class

10/20/2011 7:28 AM

'Instrument security factor FS for measuring windings is 0.2 and 5 is burden for CT.
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electricalexpert65
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Join Date: Oct 2009
Posts: 2061
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#2

Re: CT Class

10/20/2011 9:33 AM

Class 0.2 means it is a measuring class CT with an RMS Ratio Error of + / - 0.2%. FS 5 means the factor of safety or the instrument security factor is 5. That is this + / - 0.2 % error will be maintained upto 5 times the rated primary current, beyond which the errors might increase.
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