NDLI: Impact of oil and temperature on initial voltage distributions in transformer windings at ultra fast stresses

Content Provider	IEEE Xplore Digital Library
Author	Florkowski, M. Florkowska, B. Furgal, J. Paja̧k, P.
Copyright Year	2010
Description	Author affiliation: ABB Corporate Research, ul. Starowislna 13A, 31-038 Kraków, Poland (Florkowski, M.) \|\| AGH University of Science and Technology, Department of Electrical and Power Engineering, al. Mickiewicza 30, 30-059 Kraków, Poland (Florkowska, B.; Furgal, J.; Paja̧k, P.)
Abstract	Evolution and operation of modern grids and networks leads to reconsideration of several aspects. For example, transformers operating in a power grid or in industrial environment are nowadays also subjected to transients or stimuli with ultrafast wavefronts. Traditionally, in the case of power transformers the stresses are related to lightning and switching phenomena. In industrial networks distribution transformers are exposed to many switching operations generating often overvoltages. Transformer windings subjected to such effects are stressed due to the voltage distribution along the winding and potential resonance phenomena. Initial voltage distribution, reflects mainly the capacitive coupling between turns, windings, core and tank. The non uniform character of stress, results in focus on certain parts of the winding. The impact of oil and temperature on initial distribution attributes will be presented in this paper. Winding resonance might occur, if the spectrum of incoming surge voltage matched the winding one, and the corresponding resonance was excited. Therefore external transients occurring in power systems might trigger out internal overvoltages with high maximum value in transformer windings. The frequency characteristic of the transformer winding may determine those regions in the frequency spectrum. The paper presents results of voltage distribution measurements performed on model winding subjected to ultra fast stresses. On a special setup the influence of oil and temperature on the stress distribution along the winding could be investigated. The distribution of stress as a function of surge rise time and winding position will be presented, while oil impact and temperature will be additional parameters. Special focus is paid on the analysis of the surge rise time and steepness on the winding stress. The presented results might be used both for designing and optimization of transformers windings.
Starting Page	1
Ending Page	4
File Size	8595491
Page Count	4
File Format	PDF
ISBN	9781424494682
ISSN	00849162
e-ISBN	9781424494712
DOI	10.1109/CEIDP.2010.5723976
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Windings Petroleum Temperature measurement Dielectrics Temperature distribution Resonant frequency Capacitance
Content Type	Text
Resource Type	Article

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