Abstract
Surface flashover phenomena in vacuum restrict the overall performance of insulation system, which seriously limits the development of high voltage electro-vacuum devices. On the basis of the low melting temperature machinable glass ceramic for vacuum insulation system, which has excellent machinable performance and good surface electrical capability, the surface electrical properties of samples with different preparation technologies were investigated before and after treated with hydrofluoric acid. By employing the surface potential decay method, its surface trap distribution was measured, and the influence of acid treatment on the surface trap distribution was analyzed. Based on the concurrent optical and electric measurements, the surface electric strength of samples with different treatments was tested in vacuum, and the influence of surface trap density and energy on flashover performance was analyzed. It shows that, the glass phase on the surface of glass ceramics is an important factor for the largely existing shallow traps, and the shallow traps bring disadvantage in the flashover characteristics. By eroding off the glass phase in the sample with hydrofluoric acid treatment, the shallow traps can be reduced, thus its flashover stability can be greatly improved and its scattering phenomenon is significantly reduced.
| Original language | English |
|---|---|
| Pages (from-to) | 27-32 |
| Number of pages | 6 |
| Journal | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering |
| Volume | 29 |
| Issue number | 7 |
| State | Published - 5 Mar 2009 |
Keywords
- Glass ceramic
- Surface flashover in vacuum
- Surface treatment
- Trap parameters
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