Mapping of discharge channels in void creating effective partial discharge area
| Autor: | Marek Florkowski, Maciej Kuniewski, Barbara Florkowska, Pawel Zydron |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Void (astronomy) Materials science Surface resistivity 020208 electrical & electronic engineering 02 engineering and technology Mechanics 01 natural sciences Dielectric structure Electrical resistivity and conductivity 0103 physical sciences Partial discharge 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering |
| Zdroj: | IEEE Transactions on Dielectrics and Electrical Insulation. 25:2220-2228 |
| ISSN: | 1558-4135 1070-9878 |
| DOI: | 10.1109/tdei.2018.007426 |
| Popis: | This paper describes a novel approach to understanding partial discharge (PD) dynamics and mapping of the discharge channels in a void. During long term PD exposure, discharges develop inside channels within a void, leading to a variation in the discharge area on the void wall as well as a clustering effect. In this paper, the development of a method for identifying localized changes in the dielectric structure, through the detection of dispersed channels with reduced resistivity which occur due to multichannel discharges, is described. Discharge spots in selected ranges of surface resistivity, occurring due to the energetic impact of PD, are mapped. This mapping shows both the distribution of local centers on the surface of the specimen, characterized by a reduced value of surface resistivity. Furthermore, during aging tests this surface resistivity exhibited a progressive reduction by four orders of magnitude, justifying the occurrence of an effective discharge area in the void source. This additionally impacts PD pattern modulation and can be a possible initiation of the formation of cross channels in the bulk isolation which, in the long term, can lead to complete discharge. |
| Databáze: | OpenAIRE |
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