超高压线路绝缘子冰闪过程的泄漏电流波形变化特性  

Leakage Current Waveform Change Rate of EHV Transmission Line Insulator in Icing-melting Flashover Process

作　　者：蔡炜[1] 康丽[2] 刘云鹏[3] 姚涛[1] 许佐明[1] 

机构地区：[1]国网电力科学研究院,武汉430074 [2]东莞理工学院电子工程学院,东莞523808 [3]华北电力大学电力工程系,保定0710031

出　　处：《高电压技术》2011年第8期2038-2044,共7页High Voltage Engineering

基　　金：国家"十一五"科技支撑计划重大项目(2006BAA02A03);国家电网公司重大科技项目(SG0858)~~

摘　　要：输电线路绝缘子冰闪过程中泄漏电流的变化发展与放电过程以及冰的融化状态紧密相关,泄漏电流的特征量能够反映冰层的状态变化以及放电的发展。为了解超高压500 kV线路绝缘子融冰闪络特性,在环境气候试验室开展了污秽、覆冰条件下的试验研究,同步测量了融冰闪络试验中闪络和耐受两种状态下的泄漏电流,并进行了特性分析。分析结果表明:冰闪过程中泄漏电流的变化发展与放电过程紧密相关,电弧越强烈泄漏电流越大且波形畸变越小;在恒压下闪络和耐受的波形变化率有明显差异,且两种情况的平均波形变化率存在明显分界线ε,该值可以为超高压绝缘子冰闪预警提供参考。The characteristics of leakage current can reflect the state change and ice discharge development. We ex- perimentally study on UHV 500 kV transmission line insulator ice flashover characteristics in contamination and ic- ing conditions in environmental climatic test chamber, measured the leakage current in ice flashover test under the conditions of withstand and flashover at the same time, and analyzed the characteristics. The analysis results show that： the variation and development of the leakage current in the process of insulator ice flashover are related to the discharge process. When discharge is stronger, the leakage current is larger and the distortion of waveform is smal- ler; There exists a remarkable difference in the waveform change rates between flashover and withstand condition at the constant vo｜tage. And there exists obvious boundary in the two cases. This value can provides a reference for the prediction of high voltage insulator ice flashover.

关 键 词：输电线路 绝缘子 人工覆冰 闪络电压 泄漏电流 虚拟仪器 

分 类 号：TM216[一般工业技术—材料科学与工程]