In a Dyn11 transformer, how are the 3 windings of the delta
connected? Assume that R1-R2, Y1-Y2, B1-B2 are the 3
windings on the HV side.

Answer Posted / amit biswas

DYn11 means a step up tr. where pr. side is delta connected
and sec side is star connected."n" stands for neutral which
means a netral is taken from the star point of the sec. wdg.
11 means sec is leading the the pr. by 30 deg.

using neutral is essential for zero seq. protection

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