Obtain the symmetrical components of a set of unbalanced currents:IA = 1.6 425IB = 1.0 2180lc = 0.9 4132Given Vo = 3.5 4122, V₁ = 5.0 Z-10, V₂ = 1.9 292, find the phase sequencecomponents VA, VB and Vc.The following are the symmetrical components of phase B current.Positive sequence component10 cis (45°)Negative sequence component20 cis (-30°)0.5 + j0.9Zero-sequence componentDetermine the positive-sequence component of phase A.

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Obtain the symmetrical components of a set of unbalanced currents: IA = 1.6 225 IB = 1.0 2180 Ic = 0.9 4132

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

Obtain the symmetrical components of a set of unbalanced currents:
IA = 1.6 425
IB = 1.0 2180
lc = 0.9 4132
Given Vo = 3.5 4122, V₁ = 5.0 Z-10, V₂ = 1.9 292, find the phase sequence
components VA, VB and Vc.
The following are the symmetrical components of phase B current.
Positive sequence component
10 cis (45°)
Negative sequence component
20 cis (-30°)
0.5 + j0.9
Zero-sequence component
Determine the positive-sequence component of phase A.

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