Transformer Vector Group

Can anybody explain about 41Dy11 Vector Group of a transformer and what it really make difference from other conventionally used vector groups

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I remember from my Tech days that the nomenclature stands for this :-

  1. Group
  2. 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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