Discussion
A star-star connected transformer without a delta or tertiary winding suffers from
Answer: C
Correct answer: distortion of the phase voltages by triple harmonics
The magnetising current contains a strong third harmonic, and in a star-star connection with no delta winding and no neutral path that harmonic current cannot circulate. It is therefore forced into the flux instead, and the phase voltages are distorted by a large third harmonic. A delta tertiary provides the circulating path and cures it.
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