A 20 MVA, 11 kV, 3-phase, delta-connected synchronous motor has a synchro nous impedance of 15 W/phase. Windage, friction and iron losses amount to 1200 kW.
(a) Find the value of the unity power factor current drawn by the motor at a shaft load of 15 MW. What is the excitation emf under this condition?
(b) If the excitation emf is adjusted to 15.5 kV (line) and the shaft load is adjusted so that the motor draws upf current, find the motor output (net).