不同雾霾环境下瓷绝缘子交流闪络特性

Study on the AC Flashover Performance of Porcelain Insulator under Different Fog and Haze Environment

雾霾引起的闪络事故波及面较广,停电时间长,严重威胁了电网的安全运行和经济社会生活的正常秩序。以普通瓷绝缘子为对象,通过改变雾霾浓度、雾水电导率以及雾霾成分,试验研究了绝缘子在不同雾霾环境下的闪络特性,并且分析了泄漏电流的变化。研究发现,雾霾浓度对绝缘子闪络特性有影响,且随着雾霾罐中雾霾的浓度越来越大,绝缘子的闪络电压下降,泄漏电流升高;雾水电导率对绝缘子雾霾环境下闪络特性有影响,且随着通雾雾霾的雾水电导率的增大,绝缘子的闪络电压有降低趋势,但是变化幅度较小;(NH4)2SO_4颗粒对应的绝缘子闪络电压比Ca SO_4要小。研究结果可为输配电外绝缘设计以及防污闪措施的选择提供一定参考。

The flashover accidents caused by fog and haze will affect a large-scale power system for a relative long period, which seriously threats the safety operation of power grid and the regular order of social economy. In this paper, the standard porcelain insulator is taken as the sample, and its flashover performance under different fog and haze conditions is studied by changing the fog and haze concentration, fog conductivity and fog and haze compositions. Also the leakage current is analyzed. Research results indicate that, fog and haze concentration effects insulator flashover performance, the higher the fog and haze concentration, the lower the flashover voltage and the higher the leakage current. Fog conductivity also has effects on the flashover performance under fog and haze condition, and with the increase of fog conductivity, there is a decreasing trend in insulator flashover voltage in a small scale. The flashover voltage when the fog and haze composition is （NH4）2SO4is lower than that when the composition is CaS04. This research can provide some references for the outdoor insulation design and the selection of anti-pollution flashover measurements.