5.18 A 60-Hz, 230-mile, three-phase overhead transmission line has a series impedance z = 0.8431/79.04° N/mi and a shunt admittance y = 5.105 ×10-6/90° S/mi. The load at the receiving

end is 125 MW at unity power factor and at 215 kV. Determine the voltage, current, and both real and reactive power at the sending end and the percent voltage regulation of the line. Also find the wavelength and velocity of propagation of the line.