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The primary current in a C.T. is _________

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The primary current in a C.T. is _________

(a) independent of secondary circuit

(b) dependent on the secondary circuit

(c) depends on the transformation ratio

(d) depends on the nominal ratio

I got this question in final exam.

The above asked question is from Differences between C.T. and P.T. topic in section Extension of Instrument Ranges of Electrical Measurements

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The correct choice is (a) independent of secondary circuit

To explain: A C.T. is used for the measurement of high magnitude of currents in a circuit, while a P.T. is used for the measurement of high magnitude of voltages in a circuit. Primary current in a C.T. is independent of the secondary circuit conditions.

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