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Q1: A 220kV, 50Hz, three-phase overhead transmission line is 90km long and rated at 150MVA. Its parameters are: r=0.09?/km, x=0.88?/km, y=4.1×10-6S/km. The voltage at the receiving end of the transmission line is 210kV. a) What is the per-phase series impedance and shunt admittance of this transmission line? b) What is the sending end voltage if the line is supplying rated apparent power at a power factor of 0.85 lagging? c) What is the sending end voltage if the line is supplying rated apparent power at a power factor of 1.0? d) What is the sending end voltage if the line is supplying rated apparent power at a power factor of 0.85 leading? e) What is the voltage regulation and efficiency of the transmission line w