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A three phases, 6 MVA, 22 kV, 60 Hz synchronous machine has a synchronous reactance of...

A three phases, 6 MVA, 22 kV, 60 Hz synchronous machine has a synchronous reactance of 10 ohms per phase and has negligible stator resistance. The machine is connected to the 22 kV, 60 Hz bus and is operated as a synchronous condenser, Neglect rotational losses 7

a) For normal excitation, find the stator current. Draw the phasor diagram.

b) If the excitation is increased to 120 percent of the normal excitation, find the stator current and power factor, draw the phasor diagram.

c) If the excitation is decreased to 80 percent of the normal excitation, find the stator current and power factor. Draw the phasor diagram.

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