A 30, 10 kVA, 400 V, 4-pole, 50 Hz star connected synchronous machine has synchronous reactance of 16 2 and negligible resistance. The machine is operating as a motor on 400 V bus-bars (assumed infinite). The field excitation is adjusted so that the power factor is unity when the machine draws 6 kW. Determine the excitation emf and torque angle. Draw the phasor diagram.

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A 30, 10 kVA, 400 V, 4-pole, 50 Hz star connected synchronous
machine has synchronous reactance of 16 2 and negligible
resistance. The machine is operating as a motor on 400 V bus-bars
(assumed infinite). The field excitation is adjusted so that the
power factor is unity when the machine draws 6 kW.
Determine the excitation emf and torque angle. Draw the
phasor diagram.
Transcribed Image Text:A 30, 10 kVA, 400 V, 4-pole, 50 Hz star connected synchronous machine has synchronous reactance of 16 2 and negligible resistance. The machine is operating as a motor on 400 V bus-bars (assumed infinite). The field excitation is adjusted so that the power factor is unity when the machine draws 6 kW. Determine the excitation emf and torque angle. Draw the phasor diagram.
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