摘要
由于窄带干扰和随机白噪声等复杂噪声的干扰,高压电缆局部放电(PD)测量的精确度会受到影响。为解决过去使用硬阈值或软阈值方法存在的过度压缩等问题,提出基于自适应阈值的高压电缆局部放电信号方法。详细介绍了所提方法的原理,改进了软、硬阈值的缺点,使得在处理复杂局放信号时可以自适应选取阈值参数,达到对含噪局放信号的自适应降噪处理。通过实验仿真结果表明,所提方法能够有效去除高压电缆局部放电时存在的噪声干扰,有效保留局放信号的原始特征,有较高的信噪比提升和较低的信号误差,可有效提取局放信号中的有效信息。
There are interference components such as narrow-band interference and random white noise in the detection of high voltage cable partial discharge,which seriously affects the accuracy of partial discharge measurement.In order to solve the problems of discontinuity and over-compression of wavelet coefficients in partial discharge measurement by hard threshold and soft threshold methods,this paper proposes an adaptive threshold algorithm to suppress noise signals of partial discharge signals.By further improving the combination of the hard threshold and the soft threshold,the signal deviation caused by the two thresholds is reduced.Through laboratory simulation experiments,and compare the methods before improvement.The results show that the method proposed in this paper can effectively remove the noise interference existing in the partial discharge of high-voltage cables,effectively retain the original characteristics of the PD signal,have a higher signal-to-noise ratio and lower signal errors,and can effectively extract the PD signal Valid information in.
作者
付伟
Fu Wei(China Pingmei Shenma Group Equipment Leasing Branch,Pingdingshan 467000,China)
出处
《电子测量技术》
2020年第11期138-141,共4页
Electronic Measurement Technology
基金
河南省科技攻关项目(182102310936)资助
关键词
高压电缆
局部放电
硬阈值
软阈值
自适应阈值
high voltage cable
partial discharge
hard threshold
soft threshold
adaptive threshold
作者简介
付伟,工学学士,高级工程师,主要研究方向为矿用机电设备技术管理。E-mail:hpummm@126.com
