NDLI: Building factor of a 100 KVA 3 phase distribution transformer core

Content Provider	IEEE Xplore Digital Library
Author	Qader, A.A. Basak, A.
Copyright Year	1965
Abstract	The no load iron loss in laminated transformer cores is always greater than the nominal loss of the electrical steel laminations, as measured in an Epstein square or a single strip tester, by a factor known as the building factor. It is as important to improve the building factor of the transformer cores as it is to attempt to improve the basic properties of the steel since it is meaningless to build a transformer with a poor building factor using good quality steel. In this paper an attempt has been made to break down the measured loss of a 100 KVA 3 phase distribution transformer into several components to obtain a good indication of the most important parameters which affect the building factor. Forty two percent of the loss was found to occur in the limbs and yokes, whereas, the loss in the T-section areas accounted for only five percent. The losses due to the third harmonic circulating flux, the mean stress level and the stacking method were estimated to be 10%, 17% and 18% respectively. The unaccounted loss of eight percent could be partly attributed to the higher harmonics and possibly some errors in estimation.
Sponsorship	IEEE Magnetics Society
Starting Page	1487
Ending Page	1489
Page Count	3
File Size	302797
File Format	PDF
ISSN	00189464
Volume Number	18
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1982-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transformer cores Steel Loss measurement Iron Lamination Electric variables measurement Strips Testing Phase measurement Stress
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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