恒压洁净雾环境中复合绝缘子表面泄漏电流特征参量分析

A Study on Leakage Current Properties of Composite Insulators in Constant Voltage Clean Fog Environment

为有效地建立污闪与泄漏电流之间的关系,针对一种憎水性充分迁移的10kV复合绝缘子试样,采用恒压洁净雾试验方法,分析了泄漏电流特征参量随受潮时间的长期变化特征,并讨论了泄漏电流各个特征参量与污闪之间的对应关系。结果表明:累积泄漏电流脉冲数目及累积放电量随时间的变化特性与试品是否发生污闪有对应关系,即发生闪络的试品其表面累积泄漏电流脉冲数目及累积放电量的上升速度均快于未闪络的试品。

To establish the relation between leakage current and pollution flashover, taking a kind of 10kV composite insulator as test specimen whose hydrophobicity is adequately mitigated and by use of constant voltage clean fog test method, the long-term variation feature of characteristic parameters of leakage current with wetting time is analyzed and the corresponding relation of each characteristic parameter of leakage current to pollution flashover is researched. Research results show that there is corresponding relation among both cumulative pulse numbers of leakage current and variation feature of cumulative charge with time to whether the test specimen flashover or not, namely, the ascending velocities of cumulative pulse numbers of leakage current and the cumulative charge of the test specimen on which the flashover occurred are faster than that of the test specimen on which the flashover does not occur