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A 100-MVA, 20-kV, 60-Hz three-phase synchronous generator is connected to a 100-MVA, 20/400 kV three-phase transformer. The machine has the following per unit reactances and time constants. X = 0.15pu X = 0.25 pu T, = 0.035 sec T, = 0.5 sec X, =1.25pu T, = 0.3sec The transformer reactance is 0.25 per unit. The generator is operating at the rated voltage and no- load when a three-phase short circuit occurs at the secondary terminals of the transformer. (a) Find the subtransient, transient, and the steady state short circuit currents in per unit and actual amperes on both sides of the transformer. (b) What is the maximum asymmetrical rms current (ac plus de) at the beginning of the short circuit?

A 100-MVA, 20-kV, 60-Hz three-phase synchronous generator is connected to a 100-MVA, 20/400 kV three-phase transformer. The machine has the following per unit reactances and time constants. X = 0.15pu X = 0.25 pu T, = 0.035 sec T, = 0.5 sec X, =1.25pu T, = 0.3sec The transformer reactance is 0.25 per unit. The generator is operating at the rated voltage and no- load when a three-phase short circuit occurs at the secondary terminals of the transformer. (a) Find the subtransient, transient, and the steady state short circuit currents in per unit and actual amperes on both sides of the transformer. (b) What is the maximum asymmetrical rms current (ac plus de) at the beginning of the short circuit?

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 100-MVA, 20-kV, 60-Hz three-phase synchronous generator is connected to a 100-MVA, 20/400 kV three-phase transformer. The machine has the following per unit reactances and time constants. X; =0.15pu X, = 0.25 pu T, = 0.035 sec T, = 0.5 sec X, =1.25pu T, = 0.3 sec The transformer reactance is 0.25 per unit. The generator is operating at the rated voltage and no- load when a three-phase short circuit occurs at the secondary terminals of the transformer. (a) Find the subtransient, transient, and the steady state short circuit currents in per unit and actual amperes on both sides of the transformer. (b) What is the maximum asymmetrical rms current (ac plus de) at the beginning of the short circuit?
Transcribed Image Text:A 100-MVA, 20-kV, 60-Hz three-phase synchronous generator is connected to a 100-MVA, 20/400 kV three-phase transformer. The machine has the following per unit reactances and time constants. X; =0.15pu X, = 0.25 pu T, = 0.035 sec T, = 0.5 sec X, =1.25pu T, = 0.3 sec The transformer reactance is 0.25 per unit. The generator is operating at the rated voltage and no- load when a three-phase short circuit occurs at the secondary terminals of the transformer. (a) Find the subtransient, transient, and the steady state short circuit currents in per unit and actual amperes on both sides of the transformer. (b) What is the maximum asymmetrical rms current (ac plus de) at the beginning of the short circuit?
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