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Etude de la charge d'espace et des phénomènes luminescents comme précurseurs du vieillissement électrique d'une résine époxy utilisée dans l'isolation haute tension

Abstract : The epoxy resin on which this work is based finds its application in transformers for low and high voltage. Its characteristic is to be reinforced by metal and mineral particles and to have a working temperature above its glass transition temperature (Tg=65°C). The life time of the resin - like that of any organic insulator of polymeric type - is conditioned by the electric stress and in particular by degradation mechanisms and dielectric breakdown. Upstream from that there is the mechanism of electric ageing on which no physical description exists to date. However, an assumption is put forward: space charge accumulation and electroluminescence would constitute markers of electric ageing. Following this assumption, we undertook to bring understanding on the behaviour of this resin with respect to space charge, electroluminescence, current and photoluminescence. We have especially revealed that electroluminescence and space charge accumulation phenomena are active in this epoxy resin, with a strong acceleration of the processes beyond 10kV/mm. The steps downstream to the ageing model remains to be validated, namely: the implication of space charge and of side phenomena to electroluminescence in the formation of voids and/or in the critical modification of electric properties, that are phenomenologies usually associated to the question of electric ageing.
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https://tel.archives-ouvertes.fr/tel-00010051
Contributor : Olivier Gallot-Lavallée <>
Submitted on : Tuesday, September 6, 2005 - 4:08:59 PM
Last modification on : Friday, January 10, 2020 - 9:08:17 PM
Long-term archiving on: : Friday, April 2, 2010 - 10:23:32 PM

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  • HAL Id : tel-00010051, version 1

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Olivier Gallot-Lavallée. Etude de la charge d'espace et des phénomènes luminescents comme précurseurs du vieillissement électrique d'une résine époxy utilisée dans l'isolation haute tension. Matériaux. Université Paul Sabatier - Toulouse III, 2004. Français. ⟨tel-00010051⟩

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