Discussion
The magnetising current of a transformer is non-sinusoidal because
Answer: D
Correct answer: the core's magnetisation curve is nonlinear
Producing a sinusoidal flux in a nonlinear magnetic material requires a non-sinusoidal current, because the relation between flux and magnetomotive force is a curve and not a straight line. The distortion is rich in third harmonic, which is why three-phase connections must provide it a circulating path - the reason a delta or tertiary winding exists.
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