A three-phase wye-delta transformer is rated 225-kV:24-kV, 400 MVA and has a series reactance of 11.7 ohms as referred to its high-voltage terminals. The transformer is supplying a load of 325 MVA, with 0.93 power factor lagging at a voltage of 24 kV (line-to-line) on its low-voltage side. It is supplied from a feeder whose impedance is 0.11 + j2.2 ohms connected to its high-voltage terminals.
For these conditions, calculate:
(a) the line-to-line voltage at the high-voltage terminals of the transformer
(b) the line-lo-line voltage at the sending end of the feeder.