Masters Theses


"This thesis examines the transformer connections that can be used in the new 138-12.47 kV substations on the Union Electric power system. The object is to determine if a zero phase shift transformer without a delta connected tertiary winding can be used and economically justified. Traditionally a delta winding has been automatically included for this application without taking engineering time and effort to study all ramifications including possible dollar savings available with other connections. Three transformer manufacturers supplied technical and cost data which are analyzed, based on Union Electric system conditions. Consideration of relaying, harmonics and unbalanced loading shows that the delta winding is not required and that a more reliable, less expensive transformer can be used. Based on this study it is concluded that the grounded wye-grounded wye transformer is the proper transformer to use at Union Electric 138 - 12.47 kV substations"--Abstract, page ii.


Morgan, J. Derald

Committee Member(s)

Richards, Earl F., 1923-
Hegler, Burns E.


Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering


University of Missouri--Rolla

Publication Date



vii, 58 pages

Note about bibliography

Includes bibliographical references (pages 56-57).

Geographic Coverage

Saint Louis (Mo.)


© 1974 John Glenn Walsh, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Library of Congress Subject Headings

Electric transformers -- Testing
Electric relays
Electric power distribution

Thesis Number

T 2945

Print OCLC #


Electronic OCLC #


Link to Catalog Record

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