利用泄漏电流分帧与小波技术识别覆冰绝缘子闪络故障  

Recognition of Flashover Fault on the Iced Insulator Based on Frame Segmentation and Wavelet Technology for Leakage Current

作　　者：李毅[1,2] 周野[1] 钟浩[1] 吴政球[1] 胡向阳[2] 聂云[2] 李建奇[3] 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082 [2]湖南省电力公司张家界电业局,张家界427000 [3]中南林业科技大学,长沙410004

出　　处：《高压电器》2011年第2期27-30,共4页High Voltage Apparatus

基　　金：湖南省科技厅工业支撑计划项目(2010GK3190);湖南省科技厅重点项目(2008FJ2004)~~

摘　　要：在人工气候室内,通过动态采集3片串XP-70覆冰绝缘子融冰过程中的泄漏电流,并在比较传统利用时频域分析泄漏电流存在不足的基础上,提出了对闪络全过程的泄漏电流采用分帧计算参考量:短时能量信号和过零率信号的极值,利用小波分解重构能量信号与过零率信号的包络曲线,从而从数值和曲线2个直观的角度快速地为覆冰绝缘子闪络故障的发生提供预警。The traditional leakage current＇s time-frequency analysis method has some insufficiencies.Through dynamic measuring leakage current on the 3-piece string iced insulators at ice-melting stage in artificial climate chamber,this paper proposed that uses frame segmentation method to calculate the reference values：the extreme value of short-time energy signal and zero-cross signal.Through using wavelet decomposition reconstructing the envelope curves of energy signal and zero-cross signal,provides early warning for iced insulators flashover fault from both data and curve aspects.

关 键 词：覆冰绝缘子 放电 闪络 分帧 小波 预警 

分 类 号：TM216[一般工业技术—材料科学与工程]