5.4. The ABCD constants of a three-phase transmission line are

The load at the receiving end is 50 MW at 220 kV with a power factor of 0.9 lagging. Find the magnitude of the sending-end voltage and the voltage regulation. Assume that the magnitude of the sending-end voltage remains constant.

5.5. A 113-km, single-circuit, three-phase line composed of Ostrich conductors given in Table A.3 is arranged in flat horizontal spacing with 4.6 m between adjacent conductors. The line delivers a load of 60 MW at 230 kV with 0.8 power-factor lagging.

a. Using a base of 230 kV, 100 MVA, determine the series impedance and the shunt admittance of the line in per unit. Assume a wire temperature of 50°C. Note that the base admittance must be the reciprocal of base impedance.

b. Find the voltage, current, real and reactive power, and the power factor at the sending end in both per unit and absolute units.

c. What is the percent regulation of the line?