Answer Posted / 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

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