NDLI: Static electrification in power transformers: experimental study and modelling of a pressboard submitted to an impinging oil jet

Content Provider	IEEE Xplore Digital Library
Author	Moreau, O. Artana, G. Touchard, G.
Copyright Year	1996
Description	Author affiliation: Direction des Etudes et Recherches, Electr. de France, Clamart, France (Moreau, O.)
Abstract	For the last twenty years, static electrification has been suspected as being responsible for failure in power transformers. As a matter of fact internal parts show evidence of electrical discharges: erosion of the pressboard surface (electric tree paths), "worms holes", presence of carbon, etc. The phenomena consists of a preferential adsorption of negative ions from the oil (impurities) into the pressboard. This yields on the one hand a space charge in the oil which can relax in contact with grounded metallic walls and on the other hand a space charge in the pressboard which can accumulate depending on the leakage paths. EPRI started an important research program involving universities, manufacturers and utilities to solve the problems or to minimize the effects on operating apparatus and to define new specifications for the future devices. If on the one hand, all the parameters of influence seem to be clearly identified, on the other hand their critical combination has not been verified. As part of the research program of Electricite de France, an experiment at the university of Poitiers, associating a numerical modeling method developed at the R&D center of EDF with the computational fluid dynamic software ESTET, has been carried out to study the influence of a 3D oil flow geometry encountered in transformers. These investigations should make it possible to determine a critical context which might explain the observed incidents.
Starting Page	186
Ending Page	189
File Size	347071
Page Count	4
File Format	PDF
ISBN	0780335805
DOI	10.1109/CEIDP.1996.564655
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-10-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power transformers Petroleum Space charge Educational institutions Surface discharges Impurities Contacts Manufacturing Solid modeling Numerical models
Content Type	Text
Resource Type	Article

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Experimental study and modeling of static electrification in power transformers

Experimental study and modeling of static electrification in power transformers

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