A 69-kV, three-phase short transmission line is 16 km long. The line has a per phase series impedance of 0.125 +50.4375 Ω per km. Determine the sending end voltage, voltage regulation, the sending end power, and the transmission efficiency when the line delivers (a) 70 MVA, 0.8 lagging power factor at 64 kV. (b) 120 MW, unity power factor at 64 kV.

a. Determine the sending-end voltage, current, power factor, and real power. 2= 40 +j175 0 and a total shunt admittance Y i10'S. The line delivers 3 MW at 220 kV and 0.9 power factor lagging. 9.34 A three-phase, 60-Hz, 300-mi transmission line has a total series impedance a. Determine the sending-end voltage, current, power factor, and real power.

A single phase transmission line delivers 1500 kW at 33 kV at 0.8 p.f. lagging. The total resistance and inductive reactance of the line are 10 2 and 15 2 respectively. Determine     (i) sending end voltage (ii) sending end p.f. and (iii) efficiency of transmission.

2. A 200-km, 230-kV, 60-Hz three-phase line has a positive-sequence series impedance z = 0.07 + j0.58 ohms/km and a positive-sequence shunt admittance y = j4.33 x 10^-6 S/ km. At full load, the line delivers 350 MW at 0.95 pf lagging and at 220 kV. Using the nominal pi circuit, calculate: (a) the ABCD parameters (b) the sending-end voltage and current, and (c) the percent voltage regulation.