So, I want to double check myself here. The reason that you can't parallel a wye-wye and a wye-delta transformer is because the secondary voltages would be 30 degrees out of phase. That is due to the wye-delta transformer shifting the phase 30 degrees while the wye-wye doesn't, correct? You can parallel like transformers (i.e. 2 wye-deltas, 2 delta-wyes, 2 delta-deltas or 2 wye-wyes)?
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