1 .Justify Eq. (6.50) by substituting for the hyperbolic functions the equivalent exponential…

1 .Justify Eq. (6.50) by substituting for the hyperbolic functions the equivalent exponential expressions.  2 2.Determine the equivalent-7r circuit for the line of Prob. 6.12. 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.      

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