Question: A 6 0 - H z , three - phase, 3 4 . 5 k V 1 1 k V , Y - Y transformer

A 60-Hz, three-phase, 34.5kV11kV,Y-Y transformer is connected to a 50-Hz power system. Apply derating technique to find the new primary and secondary voltage after this connection.
A 6 0 - H z , three - phase, 3 4 . 5 k V 1 1 k V

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