Answer / pramit dutta

according to condition of paralleling of two or more 3 phase transformer banks ,the phase shift between primary and secondary voltages must be same. it follows that all transformers in same main group can be connected in parallel.

Answer / 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

Answer / 7anoter4

You can turn DY1 into DY11 by swapping phase B with W.See:

http://files.engineering.com/getfile.aspx?folder=df1b9784-
7409-4333-a537-
780523d888a8&file=How_to_turn_a_Dy11_transformer_into_a_Dy1.
pdf

Answer / 7anoter4

It is not possible since there are not the same phase angle
shift [they have to be in the same group of connections]
See:

http://electrical-engineering-portal.com/principles-of-
transformers-in-parallel-connection-1

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