(a) Explain briefly what is fringing effect and leakage flux.(b) A ferromagnetic core is shown in Figure 1. The depth of the core is 10 cm. The otherdimensions of the core are as shown in the figure. By assuming the magnetic leakage tobe negligible and relative permeability of the core is 800. Calculate the total reluctanceand find the value of the current that will produce a flux of 0.01 Wb. With this current,calculate the flux density at the top of the core20 cm40 cm10 cm,30 cm500 turns30 cm30 cmFigure 1

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(a) Explain briefly what is fringing effect and leakage flux.

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

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.1MCQ: The Ohms law for the magnetic circuit states that the net magnetomotive force (mmf) equals the...

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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) Explain briefly what is fringing effect and leakage flux.
(b) A ferromagnetic core is shown in Figure 1. The depth of the core is 10 cm. The other
dimensions of the core are as shown in the figure. By assuming the magnetic leakage to
be negligible and relative permeability of the core is 800. Calculate the total reluctance
and find the value of the current that will produce a flux of 0.01 Wb. With this current,
calculate the flux density at the top of the core
20 cm
40 cm
10 cm,
30 cm
500 turns
30 cm
30 cm
Figure 1

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