Masters Theses

Abstract

"Transformer impedances change when the tap positions on the primary or secondary are changed. Models were designed that gave the maximum impedance variation for a large percentage of transformers studied. These models were used to study how fault currents deviated from the predicted values if the actual transformer impedance was not the same as the predicted impedance. The effects of the change in turns ratio was also taken into account, and the base voltages were chosen to be different from the transformer voltages to include this possible error.

Faults were placed on the secondary of a model radial power system, and the resulting primary and secondary fault currents were compared to a base case set. Transformer impedance was then varied + 15% and -10% from the nominal value selected, with the appropriate turn's ratio selected, and the fault current deviations were compiled. Both unloaded and loaded transformers were tested, and the results for each of the applied faults is shown in tables and graphs"-- Abstract p. ii

Advisor(s)

Anderson, Max Darwin

Committee Member(s)

Richards, Earl F., 1923-
Pyron, Howard D.

Department(s)

Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering

Publisher

University of Missouri--Rolla

Publication Date

Spring 1988

Pagination

ix, 90 pages

Note about bibliography

Includes bibliographical references (page 89)

Rights

© 1988 Louis Scott Becker, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 5643

Print OCLC #

18237959

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