Determine the voltage regulation for the line described in Prob. 6.12. Assume that the…

Determine the voltage regulation for the line described in Prob. 6.12. Assume that the sending-end voltage remains constant. Prob. A 60-Hz three-phase transmission line is 175 mi long. It has a to al series impedance of  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.    

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