两种不同染污方式下绝缘子交流闪络特性的比较

Comparison of the AC Pollution Flashover Characteristics of Insulators Under Two Different Polluting Manners

染污绝缘子在雾、露等不利气象条件下,将可能发生绝缘子的污秽闪络,并且随着工农业生产的迅速发展,污秽程度的日益加剧,电力系统的污闪事故发生更加频繁,危害更加严重。IEC及我国推荐了几种不同的人工污秽方式以进行绝缘子闪络特性的试验研究,但对于各种人工污秽方式之间的差异并没有给予说明和研究。文中以XP-70绝缘子为例对浸污法、定量涂刷法两种不同的染污方式下绝缘子交流闪络特性进行了分析和比较。结果表明:不同染污方式下绝缘子的闪络特性有一定的差异;定量涂刷法受人为因素的影响比较大;不同惰性材料物质下的染污绝缘子闪络特性有所不同;盐密/灰密对不同染污方式下的闪络特性的影响有一定差别。

Pollution insulator may flashover under disadvantage weather conditions such as fog or dew. The pollution flashover accidents may take place more frequently with the development of industry and agriculture which make the pollution worse. Some different artificial pollution manners have been commended to study the pollution flashover characteristic in IEC and correlative standards, but no any description about the difference among them. Taking XP-70 standard insulator example, the paper analyses and compares the AC pollution flashover characteristics of insulators under two different polluting manners. The testing results show that there are some differences with the pollution flashover characteristic under different polluting manners; the infuence by man-made factor is obvious for the ration pasting method; the impact of kaolin on the pollution flashover characteristic is more obvious than that of diatomite. There are some differences for the impact of ESDDfNSDD on the pollution flashover under different polluting manners.