For a C.T. the nominal ratio is given by which of the following relation?(a) Kn = \(\frac{I_{p(rated)}}{I_{s(rated)}}\)(b) Kn = \(\frac{I_{s(rated)}}{I_{p(rated)}}\)(c) Kn = \(\frac{1}{I_{s(rated)}}\)(d) Kn = Ip(rated)I have been asked this question in semester exam.The question is from Ratios of Instrument Transformers in portion Extension of Instrument Ranges of Electrical Measurements

For a C.T. the nominal ratio is given by which of the following relati

1.	For a C.T. the nominal ratio is given by which of the following relation?(a) Kn = \(\frac{I_{p(rated)}}{I_{s(rated)}}\)(b) Kn = \(\frac{I_{s(rated)}}{I_{p(rated)}}\)(c) Kn = \(\frac{1}{I_{s(rated)}}\)(d) Kn = Ip(rated)I have been asked this question in semester exam.The question is from Ratios of Instrument Transformers in portion Extension of Instrument Ranges of Electrical Measurements
Answer» Correct ANSWER is (a) Kn = \(\frac{I_{p(rated)}}{I_{s(rated)}}\) For explanation I would say: In a CURRENT transformer, the transformation ratio is GIVEN by the ratio of the magnitude of the actual PRIMARY current to the magnitude of the actual secondary current. Kn = \(\frac{I_{p(rated)}}{I_{s(rated)}}\) where, R is the transformation ratio Ip(rated) is the rated primary WINDING current Is(rated) is the rated secondary winding current.

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