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The secondary winding of a C.T. ____________

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The secondary winding of a C.T. ____________

(a) can be shorted

(b) can’t be shorted

(c) can be opened

(d) can’t be opened

This question was addressed to me in an interview.

This interesting question is from Open Circuiting the Secondary Circuit of a Current Transformer topic in division Extension of Instrument Ranges of Electrical Measurements

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Right choice is (a) can be shorted

Easy explanation: When a C.T. is used in measurements, it acts as a short circuit. This is because the impedance of the load is negligible due to the ammeter or the wattmeter coil. Thus the secondary winding of a C.T. can be shorted.

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