Q1/ Give the system of Fig. 12.33 where a three-phase fault is applied at the point P as shown. Q2/ Fin j0.5 pha j0.25 pre j0.05 ell Infinite bus IVF120° 1 j0.4 P E|=1.2pu Fig. 12.33 Find the critical clearing angle for clearing the fault with simultaneous opening of the breakers 1 and 2. The reactance values of various components are indicated on the diagram. The generator is delivering 1.0 pu power at the instant preceding the fault.

Q1/ Give the system of Fig. 12.33 where a three-phase fault is applied at the point P as shown. Q2/ Fin j0.5 pha j0.25 pre j0.05 ell Infinite bus IVF120° 1 j0.4 P E|=1.2pu Fig. 12.33 Find the critical clearing angle for clearing the fault with simultaneous opening of the breakers 1 and 2. The reactance values of various components are indicated on the diagram. The generator is delivering 1.0 pu power at the instant preceding the fault.

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

Q1/ Give the system of Fig. 12.33 where a three-phase fault is applied at the pointo2
P as shown.
Fin
j0.5
pha
j0.25
pre
j0.05
ell
Infinite
bus
IVF120°
1
j0.4
P
E|-1.2pu
Fig. 12.33
Find the critical clearing angle for clearing the fault with simultaneous opening
of the breakers 1 and 2. The reactance values of various components are
indicated on the diagram. The generator is delivering 1.0 pu power at the instan'
preceding the fault.

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The subject is: Smart Grid Applications and Technologies
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