Answer Posted / strateia

The Dyn11 is interpreted as follows:
D-primary winding is delta connected (i.e the three primary
phase windings within the transformer)
y-the secondary winding is delta connected

11-is a multiplying factor for the phase displacement
between the primary and secondary voltages
i.e. for the Dyn11, phase displacement is
= 11*30degrees
= 330 degrees

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