表面粗糙度对有机玻璃材料真空沿面闪络特性的影响

发布时间：2019-02-13 04:59

【摘要】：目前国内外关于绝缘材料的表面粗糙度对其真空中沿面闪络特性的影响尚无定论。为此以有机玻璃材料为研究对象,采用不同目数的砂纸制备不同表面粗糙度的样品,并进行了真空沿面闪络实验研究。结果表明:随着表面粗糙度的增加,有机玻璃的闪络电压呈现U型变化规律,即先减小后增大的变化趋势。同时,研究了打磨方向对有机玻璃闪络特性的影响。在粗糙度较大的情况下,合适的打磨方向可以明显提高闪络电压,尤其是垂直于电极方向打磨时,材料表现出闪络电压高、分散性小的特点;但在粗糙度较小的范围内,闪络特性受打磨方向的影响不明显,甚至有略微下降的趋势。结合实验结果,基于二次电子发射雪崩理论,从宏观和微观2个角度讨论了粗糙度对于绝缘材料闪络特性的影响机理,提出了表面粗糙度对于闪络影响的博弈模型。
[Abstract]:At present, the influence of surface roughness on flashover characteristics of insulating materials in vacuum has not been decided at home and abroad. For this reason, the samples with different surface roughness were prepared by using sand paper with different mesh number, and the vacuum flashover along the surface was studied. The results show that with the increase of surface roughness, the flashover voltage of plexiglass shows a U-shaped change, that is, the change trend of the flashover voltage decreases first and then increases. At the same time, the influence of grinding direction on the flashover characteristics of plexiglass was studied. When the roughness is large, the flashover voltage can be improved obviously by the proper grinding direction, especially when polishing perpendicular to the electrode direction, the material exhibits the characteristics of high flashover voltage and low dispersion. But in the range of small roughness, the flashover characteristic is not obviously affected by the direction of grinding, and even has a slight downward trend. Based on the experimental results and based on the avalanche theory of secondary electron emission, the influence mechanism of roughness on flashover characteristics of insulating materials is discussed from macro and micro perspectives, and a game model of the influence of surface roughness on flashover is proposed.
【作者单位】：西安交通大学电力设备电气绝缘国家重点实验室;
【基金】：国家杰出青年科学基金(51125029) 国家重点基础研究发展计划(973计划)(2015CB251003) 国家自然科学基金创新研究群体(51221005) 中国工程物理研究院脉冲功率技术重点实验室基金(PPLF2013PZ06)~~
【分类号】：TM215.7

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