Question: Three single phase transformers with three windings are connected as below for three-phase operation: Winding #1: Star connected and grounded through an impedance of Zn

Three single phase transformers with three windings are connected as below for three-phase operation:

Winding #1: Star connected and grounded through an impedance of Zn = j0.05 pu

Winding #2: Star connected with star point solidly grounded

Winding #3: Delta connected the impedance of each winding is given to be (0.01 + j0.02) pu.

All impedance values are on a common system base SKETCH THE SEQUENCE EQUIVALENT NETWORK for the transformer.

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