电力电缆局部放电测量小波降噪技术  

Wavelet-based Denoising Technique for Partial Discharge Measurement of Power Cables

作　　者：张晓阳[1] 浦子耿 徐洪峰 

机构地区：[1]陕西省电力公司调度中心,西安710004 [2]上海益奥自控设备有限公司,上海201602

出　　处：《自动化应用》2010年第5期60-62,共3页Automation Application

摘　　要：从主要测试方法、信号提取电路和信号波形、离散小波变换(DWT)的滤波器本质特性实例分析了电力电缆局部放电的现场测量和降噪分析技术。根据离散小波降噪的母小波选择、分解尺度选择和阈值算法等3个关键因素,分析了DWT降噪应用于电缆局放现场信号处理的局限性,并对DWT降噪应用于在线局放检测的前景进行了展望。This paper analyzed the on-site measurement and denoising technique of the partial discharge （PD） for power cables from three aspects, i.e：, test method, signal extraction circuit and filter characteristic of discrete wavelet transform （DWT）. According to three key component, i.e., mother wavelet selection, decomposition level selection and threshold arithmetic selection, this paper analyzed DWT＇ s limitation when it is applied for on-site PD measurement such as cables, which have low signal-noise-ratio （SNR）. Eventiually, the application prospect of DWT for on-line PD measurement of cables is analyzed in this paper.

关 键 词：离散小波变换 电缆 局部放电 滤波器 

分 类 号：TN948.1[电子电信—信号与信息处理]