A three-phase, 770 kV, 50 Hz transposed line is composed of four 1,431,000 cmil ACSR conductors per phase, with flat horizontal spacing of 15 m. The bundle spacing is 40 cm. The line is 500 km long, and for the purpose of this problem, a lossless line is assumed. (a) Determine the ABCD parameters of the line. (b) The line delivers 1800 MVA at 0.85 p.f. lagging at 730 kV. Determine the sending end quantities, voltage regulation, and line efficiency.