to an A 3-phase, 11 kV, 20 MVA generator is connected 11 KV line. The positive, negative and Zero sequence impedances of the generator are: rating, while 18% 12% and 10% those for the line ( on are : 6216221 and 12 52. For a S-L-G fault at the fear end of the line determine the fault current and phase voltages at fault point. Assunce the generater is star point is solidly grounded. Find also the fault level (FOF 720 A) 1

to an A 3-phase, 11 kV, 20 MVA generator is connected 11 KV line. The positive, negative and Zero sequence impedances of the generator are: rating, while 18% 12% and 10% those for the line ( on are : 6216221 and 12 52. For a S-L-G fault at the fear end of the line determine the fault current and phase voltages at fault point. Assunce the generater is star point is solidly grounded. Find also the fault level (FOF 720 A) 1

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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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

100%

to an
A 3-phase, 11 kV, 20 MVA generator is connected
11 KV line. The positive, negative and
Zero sequence impedances of the generator are:
rating, while
18%
12% and 10%
those for
the line
(
on
are :
6216221 and 12 52.
For a
S-L-G fault at the fear end of the
line determine the fault current and
phase voltages at fault point.
Assunce the generater is star point is
solidly grounded.
Find also the fault level
(FOF
720 A)
1

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