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Interleaved winding and suppression of natural frequencies

Pramanik, Saurav and Anees, Sana and Satish, Lakshminarayana (2013) Interleaved winding and suppression of natural frequencies. In: IET Electric Power Applications, 7 (4). pp. 237-244.

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Official URL: http://dx.doi.org/10.1049/iet-epa.2012.0362


Ideally, it is desirable to design and manufacture a transformer winding that can render all its internal resonances non-excitable. This study examines the effectiveness of an interleaved winding in achieving this goal. While investigating its effectiveness, it led to the establishment of a much desired theoretical basis that reinforces the reasons put forward in the literature to explain internal insulation failures observed in interleaved windings used in extra high voltage (EHV) transformers. Numerical calculations along with experimental verification on actual transformer windings are presented. This study reveals that most of the natural frequencies that are normally non-excitable in the line and neutral current responses of an interleaved winding have been rendered excitable in the disk-to-disk voltages, thus, providing favourable conditions for insulation overstress because of resonant overvoltages. Prevalence of such a condition is an inherent characteristic of interleaved windings.

Item Type: Journal Article
Publication: IET Electric Power Applications
Publisher: Institution of Engineering and Technology-IET
Additional Information: Copyright of this article belongs to Institution of Engineering and Technology-IET.
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 20 Sep 2013 12:13
Last Modified: 20 Sep 2013 12:13
URI: http://eprints.iisc.ac.in/id/eprint/47228

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