Harmonics effects on wye-wye transformers

  • Thread starter GunnarDH
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What effect do harmonics have on wye-wye transformers with neutral grounded? What about not grounded? Also, in a wye-delta, why is there less distortion in the delta side voltage if neutral in the wye side is not connected to ground?
I understand why the Y transformers have distortion and the delta do not. But I don't understand why have a ground would effect either situation.
 

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