Transformer Vector Group

Can anybody explain about 41Dy11 Vector Group of a transformer and
what it really make difference from other conventionally used vector
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I remember from my Tech days that the nomenclature stands for this :-
4. Group 1. No1 in group D Delta Y Star 11 -30 degree phase displacement.
So Its a Group 4, 1st in group, Delta/Star wound and gives -30 degree phase displacement. Bill
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