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.
出处
《高压电器》
CAS
CSCD
北大核心
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)~~
关键词
覆冰绝缘子
放电
闪络
分帧
小波
预警
iced insulator
discharge
flashover
frame segmentation
wavelet
early warning
