Texts: A three-phase 765 kV, 60Hz, 300 km line has the following positive sequence impedance and admittance: z = 0.0165 + j0.3306 Ω/km, y = j4.674x10^6 S/km. Identical shunt reactors (inductors) are connected from each phase conductor to neutral at both ends of the 300-km line during light load conditions, providing 50% compensation. The reactors are removed during heavy load conditions. Full load is 1.8 kA at unity power factor and at 730 kV. Assuming that the sending-end voltage (Vs) is constant, determine the following:
a) ABCD parameters of the nominal circuit
b) Sending end voltage (Vs) and current (Is)
c) Percent voltage regulation of the uncompensated line
d) Percent voltage regulation of the compensated line
A three-phase 765 kV, 60Hz, 300 km line has the following positive sequence impedance and admittance: z = 0.0165 + j0.3306 Ω/km, y = j4.674x10^-6 S/km. Identical shunt reactors (inductors) are connected from each phase conductor to neutral at both ends of the 300-km line during light load conditions, providing 50% compensation. The reactors are removed during heavy load conditions. Full load is 1.8 kA at unity power factor and at 730 kV. Assuming that the sending-end voltage (Vs) is constant, determine the following:
a) ABCD parameters of the nominal circuit
b) Sending end voltage (Vs) and current (Is)
c) Percent voltage regulation of the uncompensated line
d) Percent voltage regulation of the compensated line