Question

Ratio error is defined as ___________

(a) Ratio error =  ^Kn⁄R

(b) Ratio error =  ^Kn – R⁄R

(c) Ratio error = Kn – R

(d) Ratio error =  ^1⁄R

I have been asked this question by my school principal while I was bunking the class.

The question is from Errors in Current Transformers topic in division Extension of Instrument Ranges of Electrical Measurements

Answer 1

Correct choice is (b) Ratio error =  ^Kn – R⁄R

Best explanation: Ratio error of a C.T. is defined as the ratio of the magnitude of the difference between the nominal and actual ratio with respect to the actual ratio.