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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...
This paper probes into the influences of preparation technology, mainly crystallization time, on the flashover characteristics of machinable ceramics under 0.4/2.5 mus impulse voltage in vacuum. Several machinable ceramic samples are prepared with the same procedure under different crystallization time. To study the association between crystallization time and flashover characteristics, the surface...
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