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Effect of DC offset voltage on AC magnetisation of transformer core steel

Marketos, P., Moses, Anthony and Hall, J. 2010. Effect of DC offset voltage on AC magnetisation of transformer core steel. Journal of Electrical Engineering 61 (7S) , pp. 123-125.

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Primary windings of transformers are fed with alternating sinusoidal voltage, but often this voltage contains small DC offset due to unsymmetrical voltage levels. To emulate such working conditions in a controlled environment (Epstein frame) the excitation waveforms were emulated as a DC voltage superimposed on an AC waveform. This resulted in non symmetrical excitation of the core steel. The harmful effects of this type of excitation on magnetising current, power loss and the B-H characteristics of the steel are shown.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Uncontrolled Keywords: electrical steel ; power loss ; DC bias
Publisher: Faculty of Electrical Engineering and Information Technology of the Slovak Technical University, and the Institute of Electrical Engineering of the Slovak Academy of Sciences
ISSN: 1335-3632
Last Modified: 04 Jun 2017 03:33

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