高海拔现场标准悬式绝缘子的交流污闪特性

绝缘子污闪特性是对高海拔地区输电线路进行外绝缘选择时需考虑的重要因素之一。目前大多数研究是在人工模拟条件下进行的，文章通过理论分析提出了高海拔条件下的污闪模型，并在高海拔现场试验研究了标准悬式绝缘子XP-70的交流污闪特性。结果表明，高海拔条件下的气压对污闪电压影响的特征指数为0.51。高海拔现场的试验研究结果表明，海拔升高，环境温度上升，污闪电压下降，污闪电压正比于绝对温度之比的幂函数，其温度影响指数为0.23。因此，文章提出研究高海拔条件下的污闪电压不仅应考虑气压的影响，而且不能忽视温度的影响。

AC Pollution Flashover Performance of Standard Suspension Insulators at High Altitude Sites

Pollution flashover performance of insulators is one of the key factors to be considered in the selection of external insulation for transmission lines at high altitude areas. At present, most related researches are performed in artificial simulation environments. On the basis of theoretical analysis, a pollution flashover model under high altitude is proposed and the AC pollution flashover performance of standard suspension insulator XP-70 is tested and researched in the high altitude sites. Test and research results show that in high altitude environment, the influencing characteristic exponent of atmospheric pressure on pollution flashover voltage is 0.51. Along with the ascending of altitude and environment temperature, the pollution flashover voltage decreases; pollution flashover voltage is in direct proportion to the power function of the ratio of absolute temperatures and the influencing exponent of temperature is 0.23. Thus, it is put forward that in the research on pollution flashover voltage in high altitude environment, the influence of atmospheric pressure should be considered, while the influence of temperature cannot be neglected.