Rework Problem 5.2 in per unit using 1000-MVA (three-phase) and \(230-\mathrm{kV}\) (line-to-line) base values. Calculate:

(a) the per-unit \(A B C D\) parameters,

(b) the per-unit sending-end voltage and current,

(c) the percent voltage regulation.

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 \(220 \mathrm{kV}\).