Rework Problem 5.2 in per-unit using 100-MVA (three-phase) and 230-kV (line-toline) base values. Calculate: (a) the per-unit $A B C D$ parameters, (b) the per-unit sending-end voltage and current, and (c) the percent voltage regulation.

Data From Problem 5.2:-

A \(200-\mathrm{km}, 230-\mathrm{kV}, 60-\mathrm{Hz}\) three-phase line has a positive-sequence series impedance \(z=0.08+j 0.48 \Omega / \mathrm{km}\) and a positive-sequence shunt admittance \(y=j 3.33 \times 10^{-6} \mathrm{~S} /\) \(\mathrm{km}\). At full load, the line delivers \(250 \mathrm{MW}\) at 0.99 p.f. lagging and at \(220 \mathrm{kV}\). Using the nominal \(\pi\) circuit, calculate: (a) the \(A B C D\) parameters, (b) the sending-end voltage and current, and (c) the percent voltage regulation.