In a 3-phase balanced star or delta system, the least number of wattmeter essential to measure the powerisO oneO fourO threeO twoThe load connected to a 3-phase supply comprises three similar coils connected in star. The line currents are15 A and the kVA ratings and input power are 15KVA and 8kW respectively.(a) Find the line and phase voltage.(b) If the coils are now connected in delta to the same three-phase supply, calculate the line current and phasecurrent.Chpf1010&8.6.7.A60O O OO

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In a 3-phase balanced star or delta system, the least number of wattmeter essential to measure the power is O one O four O three O two

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter28: Three-phase Transformers

Section: Chapter Questions

Problem 2PA

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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

In a 3-phase balanced star or delta system, the least number of wattmeter essential to measure the power
is
O one
O four
O three
O two
The load connected to a 3-phase supply comprises three similar coils connected in star. The line currents are
15 A and the kVA ratings and input power are 15KVA and 8kW respectively.
(a) Find the line and phase voltage.
(b) If the coils are now connected in delta to the same three-phase supply, calculate the line current and phase
current.
Chp
f10
10
&
8.
6.
7.
A
60
O O OO

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