A 40-kVA, 240-V, 50-Hz, 4-pole, three-phase, Y-connected alternator has a synchronous reactance of 0.08 n/phase. The armature winding resistance is negligibly small, and the revolving field is established by permanent magnets. The rotational loss is 5% of the power developed. When the gen- erator delivers the rated load at a leading power factor of 0.866, determine (a) the power angle, (b) the efficiency, (c) the voltage regulation, and (d) the torque supplied by the prime mover.
A 40-kVA, 240-V, 50-Hz, 4-pole, three-phase, Y-connected alternator has a synchronous reactance of 0.08 n/phase. The armature winding resistance is negligibly small, and the revolving field is established by permanent magnets. The rotational loss is 5% of the power developed. When the gen- erator delivers the rated load at a leading power factor of 0.866, determine (a) the power angle, (b) the efficiency, (c) the voltage regulation, and (d) the torque supplied by the prime mover.
Chapter39: Synchronous Motor Operation
Section: Chapter Questions
Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...
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Transcribed Image Text:A 40-kVA, 240-V, 50-Hz, 4-pole, three-phase, Y-connected alternator has a
synchronous reactance of 0.08 n/phase. The armature winding resistance
is negligibly small, and the revolving field is established by permanent
magnets. The rotational loss is 5% of the power developed. When the gen-
erator delivers the rated load at a leading power factor of 0.866, determine
(a) the power angle, (b) the efficiency, (c) the voltage regulation, and (d) the
torque supplied by the prime mover.
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