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A synchronous generator has the following ratings: 3 phase apparent power, 250MVA, 13.8kV (L-L, RMS), 0.85 PF, 60Hz, round rotor. Xs = 1.2 pu om the machine's rating base. a) If the torque is reduced by 15% by reducing the mechanical input but the field current is left unchanged, calculate the real and reactive power output, the generated voltage and its corresponding phase angle

A synchronous generator has the following ratings: 3 phase apparent power, 250MVA, 13.8kV (L-L, RMS), 0.85 PF, 60Hz, round rotor. Xs = 1.2 pu om the machine's rating base. a) If the torque is reduced by 15% by reducing the mechanical input but the field current is left unchanged, calculate the real and reactive power output, the generated voltage and its corresponding phase angle

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A synchronous generator has the following ratings: 3 phase apparent power, 250MVA,
13.8kV (L-L, RMS), 0.85 PF, 60Hz, round rotor. Xs = 1.2 pu om the machine's rating base.

a) If the torque is reduced by 15% by reducing the mechanical input but the field current is left
unchanged, calculate the real and reactive power output, the generated voltage and its corresponding phase angle

b) Sketch the capability curve for this generator identifying the rated power, field limit curve,
armature limit curve, the power angle δ and power factor angle Φ at rated conditions.

 

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