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Etude de l'origine des décharges partielles sur des substrats céramiques enrobés

Abstract : This work concerns the study of partial discharge phenomena on insulating materials used in power electronics. Using electrical and optical detection methods, the mechanism of partial discharges on AlN substrates in silicon oil is studied with a large number of samples. Changing the nature of substrates (AlN, and Al2O3 composite glass/epoxy) and of encapsulating materials (silicone oil, rapeseed oil, mineral transformer oil, capacitor impregnating liquids Jarylec and Ugilec) provides a number of conclusions about the origin of partial discharges on embedded substrates. Partial discharges on sintered ceramic substrates do not depend on the encapsulating material nature, but on the nature of the substrates themselves. The temporal evolution of light emitted by the liquid in a point - plane configuration, and on embedded substrates shows that the light during emission is a very complex phenomenon influenced by many parameters: electroluminescence of the solid, of the encapsulating material, partial discharges, and light absorption of materials. The electroluminescence of the liquid is activated by external light. Measurements of high voltage dielectric spectroscopy are also performed, but no additional information on partial discharges is obtained since corresponding losses are very low.
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https://tel.archives-ouvertes.fr/tel-00612433
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Submitted on : Friday, July 29, 2011 - 9:17:26 AM
Last modification on : Thursday, November 19, 2020 - 1:00:07 PM
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Anh Tho Vu Thi. Etude de l'origine des décharges partielles sur des substrats céramiques enrobés. Sciences de l'ingénieur [physics]. Université de Grenoble, 2011. Français. ⟨tel-00612433⟩

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