高海拔、污秽、覆冰环境下超高压线路绝缘子交直流放电特性闪络电压校正研究

根据在人工气候室内对交流160kN级染污瓷质、玻璃及35KV合成绝缘子以及一种形式的直流绝缘子大量的试验研究结果，得出了绝缘子在高海拔，污秽及覆冰条件下不同绝缘子的闪络特性，并分别分析了无覆冰时不同气压，污秽对绝缘子交，直流闪络电压的影响和高海拔污秽地区绝缘子覆冰量的变化对交直流闪络电压的影响；提出了不同海拔高度、污秽程度及覆冰量条件下试验中的各种绝缘子的交、直流闪络电压的初步校正公式及相应的特征指数，本文试验研究结果认为；绝缘子闪络电压随海拔升高，污秽加重和覆冰增加而呈幂函数或指数函数降低，而表征其下降速度的特征指数则与绝缘子型式，电压类别、污秽程度及覆冰量有一定关系。

AC/DC FLASHOVER PERFORMANCE AND ITS VOLTAGE CORRECTION OF UHV INSULATORS IN HIGH ALTITUDE AND ICING AND POLLUTION ENVIRONMENTS

Based on the test results carried out on 160kN porcelain and glass AC insulators, a DC insulator and a 35kV composite insulator in the artificial climate chamber, this paper puts forward the flashover performance of the tested insulators in coexisting condition of high altitude, contamination and icing, and analyzes the effect of various pressures and contaminations on the AC and DC flashover voltages of the insulators without ice, and the effect of ice amount on them under high altitude and contamination condition respectively; it obtains the correction formula of flashover voltage and its special exponent for the tested insulators in the coexisting condition of high altitude, contamination and icing. According to test results, it indicates that the flashover voltage of the tested insulators decrease in exponential low with the increase of altitude, contamination and ice amount, and the special exponents, which show the effects of altitude, contamination and ice, are various with the type of the insulator, kind of voltage, contamination degree and ice amount etc.