A 200 KVA single-phase transformer with a voltage ratio 6350/660 V has the following winding resistances and reactances: Rp = 1

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A 200 KVA single-phase transformer with a voltage ratio 6350/660 V has the following winding resistances and reactances:

Rp = 1.56 12, Rs = 0.016 Q, Xp = 4.67 , Xs = 0.048 0.

On no load the transformer takes a current of 0.96 A at a power factor of 0.263 lagging. Calculate the equivalent circuit parameters referred to the high- voltage winding.

Using the data above, calculate approximately the inherent voltage regulation at a power factor of:

(a) 1

(b) 0.8 lagging

(c) 0.8 leading