Effect mechanism of dielectric-coated electrodes on metal particle lift-off in SF(6) gas
| Autor: | Zhan Zhenyu, Lü Fangcheng, Liu Hongyu, Li Zhibing, Liu Yan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
dielectric materials
electric fields electric charge SF(6) insulation image processing dielectric-coated electrodes electric charge quantity SF(6) gas pressure metal particle lift-off DC electric field effect mechanism motion trajectory high-speed camera high-voltage electrode metal particle instantaneous displacement charge quantity computational method field distribution theoretical analysis model charge density distribution downward polarisation force charging mechanism Engineering (General). Civil engineering (General) TA1-2040 |
| Zdroj: | The Journal of Engineering (2019) |
| Druh dokumentu: | article |
| ISSN: | 2051-3305 |
| DOI: | 10.1049/joe.2018.8920 |
| Popis: | In order to study the influence mechanism of dielectrically coated electrode in SF(6) gas under DC electric field on metal particle lift-off, experimental platform is setup and motion trajectory is recorded by high-speed camera. The experiment shows that with the increasing of SF(6) gas pressures, the lift-off field of metal particle is increased and the time to reach the high-voltage electrode shortened. Instantaneous displacement of metal particle is gained by image processing and computational method of charge quantity is raised, analysing of charge quantity shows that the metal particle's charge quantity decreases. Meanwhile, theoretical analysis model of field distribution around metal particle is established, result indicates that there is an enhance of electric field between coating and metal particle and a transform of charge density distribution, which leads to a downward polarisation force for metal particle. The decreasing of the electric charge quantity and the downward polarisation force results in the increasing of the lift-off field. This article maintains that partial discharge is the charging mechanism of metal particle; the enlargement of SF(6) gas pressure brings about the raise of initial electric field of partial discharge, causing the increase of downward polarisation force with higher electric field to lift-off. |
| Databáze: | Directory of Open Access Journals |
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