A three phase transformer delivers a load of 66 MW at 0.8 p.f. lagging and 138 KV (line-to-line). The primary voltage under these conditions is 14.34 KV (line-to-line), the apparent power is 86 MVA and the power factor is 0.78 lagging .
A. Find the transformer ratio.
B. Find the series impedance representation of the transformer.
C. Find the primary voltage when the load is 75 MVA at 0.7 p.f. lagging at a voltage of 138 KV.