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A 1,000-kVA, 12.47-kV-480Y/277-V transformer with 4% impedance feeds a 480-V bus. The fault duty of the 12.47-kV system is 40 MVA. Assuming the transformer and the 12.47-kV system have the same X/R ratio, the 3-phase short-circuit current (amperes) available at the 480-V bus is most nearly: O A 10,700 O B. 18,500 O C. 24,900 O D. 30,100

A 1,000-kVA, 12.47-kV-480Y/277-V transformer with 4% impedance feeds a 480-V bus. The fault duty of the 12.47-kV system is 40 MVA. Assuming the transformer and the 12.47-kV system have the same X/R ratio, the 3-phase short-circuit current (amperes) available at the 480-V bus is most nearly: O A 10,700 O B. 18,500 O C. 24,900 O D. 30,100

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 1,000-kVA, 12.47-kV-480Y/277-V transformer with 4% impedance feeds a 480-V bus. The fault duty of the 12.47-kV system is 40 MVA. Assuming the transformer and the 12.47-kV system have the same X/R ratio, the 3-phase short-circuit current (amperes) available at the 480-V bus is most nearly: OA. O B 10,700 18,500 24,900 O D. 30,100
Transcribed Image Text:A 1,000-kVA, 12.47-kV-480Y/277-V transformer with 4% impedance feeds a 480-V bus. The fault duty of the 12.47-kV system is 40 MVA. Assuming the transformer and the 12.47-kV system have the same X/R ratio, the 3-phase short-circuit current (amperes) available at the 480-V bus is most nearly: OA. O B 10,700 18,500 24,900 O D. 30,100
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