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Problem 1(A)- In reference to the power system shown below, the system is operating at nomina voltage without pre-fault currents (load currents ignored) when a bolted ( = 0 p .u .) single line- to ground fault occurs on phase A at bus 3. Both machines are grounded through reactance. X, = X, =15% X, = 50% 2 3 4 to Y 100MVA,20KV 100MVA 100MVA 100MVA,20KV 20Υ/345Y- kV X, = X, = 20% X, = X, = X, = 8% X,= 20% 20Υ/345Υ - kV X, = X, = 20% X2 = 20% X = X, = X, = 8% X, = 4% X, = 4% X, = 5% X = 5% Fig. 1-Single-line diagram for the system in problems 1-A, 1-B, and 1-C (a) The system's Thevenin equivalent positive-, negative-, and zero-sequence networks (b) The fault current (p.u.) at phase A

Problem 1(A)- In reference to the power system shown below, the system is operating at nomina voltage without pre-fault currents (load currents ignored) when a bolted ( = 0 p .u .) single line- to ground fault occurs on phase A at bus 3. Both machines are grounded through reactance. X, = X, =15% X, = 50% 2 3 4 to Y 100MVA,20KV 100MVA 100MVA 100MVA,20KV 20Υ/345Y- kV X, = X, = 20% X, = X, = X, = 8% X,= 20% 20Υ/345Υ - kV X, = X, = 20% X2 = 20% X = X, = X, = 8% X, = 4% X, = 4% X, = 5% X = 5% Fig. 1-Single-line diagram for the system in problems 1-A, 1-B, and 1-C (a) The system's Thevenin equivalent positive-, negative-, and zero-sequence networks (b) The fault current (p.u.) at phase A

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
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Problem 1(A)- In reference to the power system shown below, the system is operating at nominal voltage without pre-fault currents (load currents ignored) when a bolted ( = 0p .u .) single line- to ground fault occurs on phase A at bus 3. Both machines are grounded through reactance. X, = X, =15% X, = 50% 1 2 3 4 my O 어。 100MVA,20KV 100MVA 100MVA 100MVA,20KV X, = X = 20% 20Υ/345Y - kV 20Y /345Y – kV X, = X = 20% X2 = 20% X, = X, = X, = 8% X, = X, = X, = 8% X2 = 20% %3D X, = 4% X, = 4% X, = 5% X = 5% Fig. 1-Single-line diagram for the system in problems 1-A, 1-B, and 1-C (a) The system's Thevenin equivalent positive-, negative-, and zero-sequence networks (b) The fault current (p.u.) at phase A
Transcribed Image Text:Problem 1(A)- In reference to the power system shown below, the system is operating at nominal voltage without pre-fault currents (load currents ignored) when a bolted ( = 0p .u .) single line- to ground fault occurs on phase A at bus 3. Both machines are grounded through reactance. X, = X, =15% X, = 50% 1 2 3 4 my O 어。 100MVA,20KV 100MVA 100MVA 100MVA,20KV X, = X = 20% 20Υ/345Y - kV 20Y /345Y – kV X, = X = 20% X2 = 20% X, = X, = X, = 8% X, = X, = X, = 8% X2 = 20% %3D X, = 4% X, = 4% X, = 5% X = 5% Fig. 1-Single-line diagram for the system in problems 1-A, 1-B, and 1-C (a) The system's Thevenin equivalent positive-, negative-, and zero-sequence networks (b) The fault current (p.u.) at phase A
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