A synchronous condenser is connected in parallel with the load described in Prob. 6.12 to improve…

A synchronous condenser is connected in parallel with the load described in Prob. 6.12 to improve the overall power factor at the receiving end. The sending-end voltage is always adjusted so as to maintain the receiving-end voltage fixed at 220 kV. Using the power-circle diagram constructed for Prob. 6.21, determine the sending-end voltage and the reactive power supplied by the synchronous condenser when the overall power factor at the receiving end is (a) unity (b) 0.9 leading. Prob A 60-Hz three-phase transmission line is 175 mi long. It has a to al series impedance of 35 +040 1 and a shunt admittance of 930 x 10-6/90° S. It delivers 40 MW at 220 kV, with 90% power-factor lagging. Find the voltage at the sending end by (a) The short-line approximation, (b) The nominal-1r approximation, and (c) The long-line equation. Prob   A three-phase transmission line is 300 mi long and serves a load of 400 MVA, with 0.8 lagging power factor at 345 kV. The ABCD constants of the line are (a) Determine the sending-end line-to-neutral voltage, the sending-end current, and the percent voltage drop at full load. (b) Determine the receiving-end line-to-neutral voltage at no load, the sending-end current at no laid. and the voltage regulation.      

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