Q1/ for the four-bus power system shown in figure 1, the positive, negative and zero sequence impedances of generators and transformers are listed in table 1. The impedances of transmission lines are indicated on the figure in per unit. Assuming the Sb=200MVA, and Vb=11kV. Find the fault and generators currents when: Line to line fault occurs in bus 3.
Q1/ for the four-bus power system shown in figure 1, the positive, negative and zero sequence impedances of generators and transformers are listed in table 1. The impedances of transmission lines are indicated on the figure in per unit. Assuming the Sb=200MVA, and Vb=11kV. Find the fault and generators currents when: Line to line fault occurs in bus 3.
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:Q1/ for the four-bus power system shown in figure 1, the positive,
negative and zero sequence impedances of generators and
transformers are listed in table 1. The impedances of transmission
lines are indicated on the figure in per unit. Assuming the
Sb=200MVA, and Vb=11kV.
Find the fault and generators currents when:
Line to line fault occurs in bus 3.
2. Line to ground fault occurs in bus 4 through impedance of j0.1 py.
1.
(2)
S-100+j70
T1
1)
j0.21
T2
小小
G2
j0.1
j0.22
j0.13
3)
S=90+j30
T3
G3
S-160+j110
j0.18
j0.1
X'
X"
x°
G1
0.2
0.2
0.04
G2
0.15
0.2
0.05
G3
0.25
0.25
0.07
T1
0.05
0.05
0.05
T2
0.04
0.04
0.04
T3
0.043
0.043
0.043
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