Answer Posted / raul

Yes, it is possible to parallel the YD11 AND DY1. Because
they lie in the same phase difference group family of the
paralleld connections. Since the phase angle difference
between the primary and secondary in both the cases is 30
degree lead and lag.

The possible parallel connections are :
1) YD1 AND DY11
2) YD11 AND DY1
3) DD0 AND DD6
4) YY1 AND YY11

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