摘要
介绍了通过测量暂态地电压(TEV)检测10 k V高压开关柜局部放电的基本原理。利用短时傅里叶变换(STFT)分析开关柜不同类型放电下局放TEV信号的时间频率特性,通过试验证明不同放电TEV信号在时频特性上存在明显差异。对信号STFT时频分析结果提取信号的时间中心tc、频率中心fc以及中心矩μc3个特征参数用以多源放电信号分离。结果表明:开关柜多源局部放电TEV信号能够在tc-fc-μc三维空间内实现信号聚类与分离,比基于傅里叶变换的传统分离方法具有更优的信号分离效果。
The principle of partial discharge（PD） in 10 kV high voltage switchgear detected by TransientEarth Voltage（TEV） method was introduced. The time-frequency characteristics of different PD TEV signalsin switchgear were analyzed using Short-time Fourier Transform（STFT） method. The tests showedthat the different PD TEV signals had obvious different time-frequency performance. The time center tc,frequency center fc, and center moment μc was extracted from time-frequency results of TEV signals toseparate the multi-source PD TEV signals. The results show that the multi-source PD signals can be gatheredand separated in tc-fc-μc three-dimensional space using the proposed method, which can better separatesignals compared with the traditional method based on Fourier transform.
出处
《绝缘材料》
CAS
北大核心
2014年第6期97-102,共6页
Insulating Materials
