5-16. A 480-V, 500-kVA, 0.8-PF-lagging, Y-connected synchronous generator has a synchronou...

5-16. A 480-V, 500-kVA, 0.8-PF-lagging, Y-connected synchronous generator has a synchronous reactance of and a negligible armature resistance. This generator is supplying power to a 480-V, 80-kW, 0.8PF-leading, Y-connected synchronous motor with a synchronous reactance of and a negligible armature resistance. The synchronous generator is adjusted to have a terminal voltage of 480 V when the motor is drawing the rated power at unity power factor.

(a) Calculate the magnitudes and angles of EA for both machines.

(b) If the flux of the motor is increased by 10 percent, what happens to the terminal voltage of the power system? What is its new value?

(c) What is the power factor of the motor after the increase in motor flux?