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The secondary winding of a C.T. is opened when?

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The secondary winding of a C.T. is opened when?

(a) C.T. is magnetised

(b) C.T. is demagnetised

(c) C.T. is shorted

(d) C.T. is opened

I had been asked this question in an online quiz.

Question is taken from Open Circuiting the Secondary Circuit of a Current Transformer topic in division Extension of Instrument Ranges of Electrical Measurements

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The correct choice is (b) C.T. is demagnetised

Explanation: In a C.T., when the secondary winding is opened by mistake when the primary current is flowing, the C.T. must be demagnetized first fully and then only must be used again in the circuit for any measurements.

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