For a C.T. the transformation ratio is given by which of the following relation?(a) R = \(\frac{I_s}{I_p}\)(b) R = \(\frac{I_p}{I_s}\)(c) R = \(\frac{1}{I_p}\)(d) R = IpI had been asked this question by my school teacher while I was bunking the class.This interesting question is from Ratios of Instrument Transformers topic in division Extension of Instrument Ranges of Electrical Measurements

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

1.	For a C.T. the transformation ratio is given by which of the following relation?(a) R = \(\frac{I_s}{I_p}\)(b) R = \(\frac{I_p}{I_s}\)(c) R = \(\frac{1}{I_p}\)(d) R = IpI had been asked this question by my school teacher while I was bunking the class.This interesting question is from Ratios of Instrument Transformers topic in division Extension of Instrument Ranges of Electrical Measurements
Answer» Right CHOICE is (B) R = \(\frac{I_p}{I_s}\) Easy explanation: 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. R = \(\frac{I_p}{I_s}\) where, R is the transformation ratio Ip is the actual primary WINDING current Is is the actual secondary winding current.

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