Answer / asho sangamnerkar

This is Y with neutral on primary and secondary
windings.Other mainly are delta -delta;delta- star' star-delta

Answer / engr mudassar hussain

Star / star transformer
HV and LV windings both are star connected to each others.
Then used YN/yn symbol for type confirmation and neutral also available on both sides.

Answer / k.prakashchandra

Star/Star with neutral available. It is also YNyn0,In this
type another is Yy6 or YNyn6

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