1.2 For each set of voltages, state whether or not the E voltages form a balanced three-phase set. If the SI set is balanced, state whether the phase sequence is positive or negative. If the set is not balanced, explain why.

1.2 For each set of voltages, state whether or not the E voltages form a balanced three-phase set. If the SI set is balanced, state whether the phase sequence is positive or negative. If the set is not balanced, explain why.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.50P: Consider the balanced three-phase system shown in Figure 2.34. Deter mine v1(t) and i2(t). Assume...

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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

11.2 For each set of voltages, state whether or not the
PSPICE voltages form a balanced three-phase set. If the
ULTISIA set is balanced, state whether the phase sequence
is positive or negative. If the set is not balanced,
explain why.

200 cos(2000t + 30°) V,
201 cos(2000t + 150°) V,
ve = 200 cos(2000t + 270°) V.
e) va = 208 cos(630t + 42°) V,
208 cos(630t – 78°) V,
208 cos(630t – 201°) V.
d) va =
%3D

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