Q:- Consider the single-line diagram of a power system shown below. The transient reactance of each part of the system is as shown in table and expressed in p.u. on a common 100 MVA base. A three-phase fault with impedance of j0.16 p.u. occurs at bus (5). Determine short-circuit capacity (fault level) and short circuit current? Assume the fault voltage at bus (5) equal 112 KV. G₁ =100 MVA G₂ = 100 MVA G₁ Xg = 10% X = 20% 11: 112 KV 112: 11 KV otot foton T₁ T₂ G₂ j0.4 j0.8 T₁=100MVA XT=10% T₂=100MVA XT=20% j0.4 4

Q:- Consider the single-line diagram of a power system shown below. The transient reactance of each part of the system is as shown in table and expressed in p.u. on a common 100 MVA base. A three-phase fault with impedance of j0.16 p.u. occurs at bus (5). Determine short-circuit capacity (fault level) and short circuit current? Assume the fault voltage at bus (5) equal 112 KV. G₁ =100 MVA G₂ = 100 MVA G₁ Xg = 10% X = 20% 11: 112 KV 112: 11 KV otot foton T₁ T₂ G₂ j0.4 j0.8 T₁=100MVA XT=10% T₂=100MVA XT=20% j0.4 4

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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Concept explainers

Fault Analysis

In an electrical engineering system, a fault is an abnormal electric current flowing through the system, and fault analysis is the study of these faults. For instance, a short-circuit is a fault where the live wire touches the ground or neutral wire. If a circuit is interrupted by a failure of a current-carrying wire then an open circuit fault occurs. The open-circuit faults are also called series faults. One or more phases or ground may be involved in a three-phase fault or may occur only between two phases. Current flows into the earth in case of a ground fault or earth fault. For most situations, the prospective short circuit current of a fault that is predictable can be calculated. To limit the loss of service because of a failure, the protective devices can detect fault conditions and operate circuit breakers and also other devices. All phases equally can be affected in a poly-phase system which is known as symmetric electrical fault. The asymmetric fault becomes more complicated to analyze if only some phases are affected. By using methods such as symmetrical components, the power system analysis of these types of faults is often simplified. The main objective of power system protection is to design, detect, and interrupt power system faults.

Question

Q:- Consider the single-line diagram of a power
system shown below. The transient reactance of
each part of the system is as shown in table and
expressed in p.u. on a common 100 MVA base. A
three-phase fault with impedance of j0.16 p.u.
occurs at bus (5). Determine short-circuit
capacity (fault level) and short circuit current?
Assume the fault voltage at bus (5) equal 112 KV.
G₁ =100 MVA
G₂= 100 MVA
X = 10%
= 20%
Xg=
j0.4
j0.8
11:112 KV
112: 11 KV
notot foton
Y
HO
T₂
G₂
G₁
T₁
T₁=100MVA
T₂=100MVA
j0.4
XT=10%
XT=20%

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