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how to solve this Q , I have to know what if Y-y change also! :...

how to solve this Q , I have to know what if Y-y change also!

:

.  A three-phase Y-Y transformer is rated at 25 MVA, 13.8-kV:69-kV and has a single-phase equivalent series impedance 62 +j388 m?     referred to the low-voltage winding.

What are the possible vector groups?

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