The positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator are j0.1 pu, j0.05 pu and j0.01 pu respectively on the machine rating base. The machine is unloaded and working at the rated terminal voltage. If the grounding impedance of the generator is j0.01 pu, then the magnitude of fault current for a b-phase to ground fault (in kA) is (up to 2 decimal places).
The positive, negative and zero sequence impedances of a 125 MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator are j0.1 pu, j0.05 pu and j0.01 pu respectively on the machine rating base. The machine is unloaded and working at the rated terminal voltage. If the grounding impedance of the generator is j0.01 pu, then the magnitude of fault current for a b-phase to ground fault (in kA) is (up to 2 decimal places).
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:The positive, negative and zero sequence impedances of a 125
MVA, three-phase, 15.5 kV, star-grounded, 50 Hz generator are
j0.1 pu, j0.05 pu and j0.01 pu respectively on the machine
rating base. The machine is unloaded and working at the rated
terminal voltage. If the grounding impedance of the generator
is j0.01 pu, then the magnitude of fault current for a b-phase to
ground fault (in kA) is
(up to 2 decimal places).
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