固体绝缘表面状态对其闪络机理影响的研究进展

Research Progress on the Effect of Solid Insulation Surface on Its Flashover Mechanism

针对固体绝缘表面状态引起的沿面闪络放电问题,综述了固体表面物化特征因素及表面缺陷对沿面闪络过程影响的研究进展。研究发现,固体绝缘沿面闪络放电特性与其表面物化特征存在关联关系,主要受表面微观形貌、表面能态、表面陷阱分布密度及表面粗糙度等因素的影响,并认为闪络现象本质上是高电场下气固界面电荷的输运行为,而且由于固体绝缘表面的固化加工缺陷,对闪络过程的分析将需要考虑表面物化特性与表面缺陷的综合作用。根据对表面微裂纹所引起的沿面异常闪络现象研究,分析了表面缺陷的形成演变过程以及对闪络放电特性的影响机制,进而提出通过改变固体绝缘表面状态特征来提高闪络电压的方法,并深入探究气固界面的闪络机理。

In order to solve the problem of surface flashover caused by the state of solid insulation surface,the influ-ence of physicochemical characteristics and surface defects on the surface flashover process is reviewed. Study foundthat there are correlation relationship between the characteristic of the flashover with solid insulation and surfacephysical and chemical characteristics,mainly by the surface microstructure of trap distribution density,surface en-ergy state and surface roughness characteristic factors,and argued that the flashover phenomenon is essentially ahigh electric field under the lose of gas-solid interface charge for operation,and because the solidification processingon the surface of the solid insulation defects,and the analysis of the flashover process will need to consider the com-prehensive function surface physicochemical properties and surface defects. According to the research of flashoverphenomenon caused by the micro cracks on the surface,the evolution process of the surface defects and the influ-ence mechanism was analyzed,the characteristics of the flashover discharge by changing the state of solid insulationsurface characteristics was put forward to improve the method of flashover voltage,and further to explore the flash-over mechanism of gas-solid interface.