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As we know, before flashover across an insulator surface under high electric field in vacuum, there are charging phenomena occurring on the insulator surface, which significantly affect the developing process of flashover. Based on the secondary electron emission avalanche (SEEA) model, and by using the Monte Carlo method, a two-dimensional analysis of surface charge density on cylindrical and conical...
The surface flashover phenomena across insulating materials always lead to the failure of system insulation and may cause serious accidents. Based on the synchronized measurement of optical and electrical signals, the flashover phenomena along alumina ceramics and polytetrafluoroethylene (PTFE) are investigated under impulse voltage in vacuum. The planar electrode system is used with the advantage...
As well known, the surface conditions of solid materials strongly affect the flashover phenomena under high electric field in vacuum. In this paper, the laser treatment was used to scratch lines on the surface of the alumina ceramic to investigate the influence of the laser treatment on the sample surface. We found that after scratched by the laser the flashover voltage on the surface of the ceramic...
Essentially surface flashover across a solid in vacuum is considered as a kind of complicated surface and interface physical phenomena. Based on the concurrent electrical and optical measurements and microscopic observations, the research works of our group concentrate on the relationship between flashover and surface/interface condition of insulating materials. There are some different optical phenomena...
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