In a 1000/5 A C.T., the number of secondary turns would be ________(a) 200(b) 199 or 198(c) 5(d) 1000The question was asked at a job interview.This interesting question is from Design Features of Current Transformers in chapter Extension of Instrument Ranges of Electrical Measurements

In a 1000/5 A C.T., the number of secondary turns would be ________(a)

1.	In a 1000/5 A C.T., the number of secondary turns would be ________(a) 200(b) 199 or 198(c) 5(d) 1000The question was asked at a job interview.This interesting question is from Design Features of Current Transformers in chapter Extension of Instrument Ranges of Electrical Measurements
Answer» CORRECT choice is (b) 199 or 198 For explanation I would say: The optimum NUMBER of secondary turns in a C.T. is the value that makes the transformation ratio (R) and nominal ratio (Kn) EQUAL. It is usually ONE or two turns less than the actual value. Thus in a 1000/5 A, though the number of turns would be 200 ideally, it is considered as 198 or 199 in order to keep R and Kn equal.

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In a 1000/5 A C.T., the number of secondary turns would be ________(a) 200(b) 199 or 198(c) 5(d) 1000The question was asked at a job interview.This interesting question is from Design Features of Current Transformers in chapter Extension of Instrument Ranges of Electrical Measurements

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