超高压线路绝缘子冰闪过程及其影响因素

Icing Flashover Process and Its Influential Factors of Long Insulator Strings on the EHV Transmission Line

输电线路绝缘子在覆冰、污秽、高海拔等因素综合作用下,绝缘性能将显著降低。为进一步分析长串绝缘子的冰闪机理,在特高压交流试验基地大型环境气候试验室内进行了污秽、覆冰条件下28片XWP2-160长串绝缘子的冰闪试验研究,对模拟真型布置下的长串绝缘子冰闪过程和闪络路径进行了初步分析,比较了绝缘子单独悬挂与模拟真型布置在覆冰状态和放电过程上的差异,结果表明:两者放电路径不同,后者带电覆冰时产生的气隙较少,同时存在冰凌对均压环放电,总体上对电弧发展更加有利。

The insulation performance of the EHV transmission line insulator strings decrease significantly under icing, pollution and high altitude conditions. In order to analyze the icing flashover mechanism of long insulator string. The flashover tests on 28 units of XWP2-160 porcelain double sheds insulator string with pre-contamination and ice covering were carried out in a large-scale artificial climate chamber at ultra high voltage （UHV） AC test base of SGCC. The discharge process, the discharge path, and its influential factors of the insulator string with grading ring and simulative conductor are discussed preliminarily. The ice-covered state and discharge path between the nongrading ring one and the one with grading ring are compared. The research results indicate that the discharge path is different, and the later has fewer air gaps, which is more advantageous to the development of partial arc.