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A 45MVA, 25KV, three-phase, 50Hz synchronous generator has a synchronous reactance of 8.2N per phase and a negligible resistance. The generator is delivering rated power at a 0.90 power factor lagging at the rated terminal voltage to an infinite bus.

A 45MVA, 25KV, three-phase, 50Hz synchronous generator has a synchronous reactance of 8.2N per phase and a negligible resistance. The generator is delivering rated power at a 0.90 power factor lagging at the rated terminal voltage to an infinite bus.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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(b) A 45MVA, 25kV, three-phase, 50HZ synchronous generator has a synchronous reactance of 8.2N per phase and a negligible resistance. The generator is delivering rated power at a 0.90 power factor lagging at the rated terminal voltage to an infinite bus. (i) Calculate the excitation voltage E in each phase and the power angle 8. (ii) Compute the armature current when the driving torque is reduced until the generator is delivering 32MW with the excitation voltage held constant at the value found in Q1(b)(i).
Transcribed Image Text:(b) A 45MVA, 25kV, three-phase, 50HZ synchronous generator has a synchronous reactance of 8.2N per phase and a negligible resistance. The generator is delivering rated power at a 0.90 power factor lagging at the rated terminal voltage to an infinite bus. (i) Calculate the excitation voltage E in each phase and the power angle 8. (ii) Compute the armature current when the driving torque is reduced until the generator is delivering 32MW with the excitation voltage held constant at the value found in Q1(b)(i).
(iii) Compute the armature current when the driving torque is adjusted until the generator is delivering 40MW with the excitation voltage is decreased to 75% of the value found in Q1(b)(i).
Transcribed Image Text:(iii) Compute the armature current when the driving torque is adjusted until the generator is delivering 40MW with the excitation voltage is decreased to 75% of the value found in Q1(b)(i).
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