Harmonic currents are not objectionable in a three-phase transformer with a delt

Question

   Harmonic currents are not objectionable in a three-phase transformer with a delta-connected secondary winding because they      A. flow in the delta winding instead of the line. B. introduce a phase difference between terminals. C. cause harmonic voltages. D. cancel out the ampere-turns in the primary.    Harmonic currents are not objectionable in a three-phase transformer with a delta-connected secondary winding because they      A. flow in the delta winding instead of the line. B. introduce a phase difference between terminals. C. cause harmonic voltages. D. cancel out the ampere-turns in the primary.

Explanation / Answer

Correct Answer - A)

EXPLANATION-

The third harmonic present in the phase magnetising current of the three phase transformer is not present in the line circuit. The third harmonic components are in phase hence cancel out each other in line. Hence, third harmonic current flows in closed delta winding.

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