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A 3-phase, five limbed shell type transformer, star connected, 200V, 50 Hz, 100 kVA will have ___________

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A 3-phase, five limbed shell type transformer, star connected, 200V, 50 Hz, 100 kVA will have ___________

(a) no third harmonic current in its phase but has sinusoidal flux

(b) third harmonic current in its phase but has flat-topped flux

(c) no third harmonic current in its phase but has flat-topped flux

(d) third harmonic current in its phase but has sinusoidal flux

I had been asked this question in semester exam.

This interesting question is from Machine Ratings in division Rating and Loss Dissipation of Electrical Machines

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Correct answer is (a) no third harmonic current in its phase but has sinusoidal flux

Explanation: Star connection in three phase has no closed path for the flow of the third harmonic current.

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