不同型式绝缘子的覆冰直流闪络特性

DC Flashover Performances of Different Types of Ice-coated Insulators

为防止重大覆冰事故的发生,在人工气候室内模拟不同气象条件对5种不同型式绝缘子进行了覆冰直流闪络试验研究。分析试验结果得出目前常用5种绝缘子在不同冰厚和不同污秽下覆冰直流闪络特性的基本特点是:不同材质和型式的绝缘子对覆冰直流闪络电压影响不大,随着冰厚增加以及污秽增加,覆冰直流闪络电压都会下将。最后提出了绝缘子串直流50%闪络电压与覆冰厚度及污秽的关系表达式为U50%=DNkρSDDd-b。

DC flashover performances under the different climate condition simulated in the artificial climate chamber were experimentally investigated on five types of ice-coated insulators. Based on the DC flashover test results in the artificial climate chamber, the effect of ice and pollution on the DC flashover performance of iced insulators was analyzed. The results show that the influence of the types on the flashover voltages is not obvious , the DC flashover voltages will decline as ice or pollution increases, therefore, the expression for DC flashover voltage of five types insulators in the single or coexisting condition of contamination and icing is put forward.