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A 3-phase, 5 MVA, kV, 60 Hz synchronous machine has a synchronous reactance of 10 ohms...

A 3-phase, 5 MVA, kV, 60 Hz synchronous machine has a synchronous reactance of 10 ohms per phase. The machine is connected to kV, 60 Hz bus and is operated as synchronous condenser (synchronous motor at no-load condition)
a. For normal excitation (excitation voltage terminal voltage), find the line current. Draw the phasor diagram
b. If the excitation is increased to 150% of the normal excitation, find the line current and reactive power delivered or absorbed by the bus. Draw the phasor
C. If the excitation is decreased to 50% of the normal excitation, find the line current and the reactive power delivered or absorbed by the bus. Draw the phasor diagram

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