(a) A 220 / 400V, 11KVA, 50HZ single phasetransformer has at full load, a copper load of145W. If it has an efficiency of 97% at halfload, unity power factor. Determine the ironlosses.(b) In a DC machine, the total armatureconductor is 1000 and the number of slots is40, then the number of conductors per slotwould be,

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Answered: (a) A 220 / 40OV, 11KVA, 50HZ single…

(a) A 220 / 40OV, 11KVA, 50HZ single phase transformer has at full load, a copper load of 145W. If it has an efficiency of 97% at half load, unity power factor. Determine the iron losses.

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

(a) A 220 / 400V, 11KVA, 50HZ single phase
transformer has at full load, a copper load of
145W. If it has an efficiency of 97% at half
load, unity power factor. Determine the iron
losses.
(b) In a DC machine, the total armature
conductor is 1000 and the number of slots is
40, then the number of conductors per slot
would be,

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