改进的电缆中间接头局放信号去噪方法  

Improvement of Noise Removal Method for Partial Discharge Signal of Cable Intermediate Joint

作　　者：孙冬 马立修[1] 潘金凤[1] 高明亮[1] 刘冲 SUN Dong;MA Li-xiu;PAN Jin-feng;GAO Ming-liang;LIU Chong(College of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255049,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255049

出　　处：《水电能源科学》2020年第5期178-180,共3页Water Resources and Power

基　　金：国家自然科学基金项目(61601266,61801272)。

摘　　要：针对电力电缆中间接头局部放电信息检测系统实际采集到的局部放电信号含有噪声的问题,提出了一种将快速傅里叶变换与改进小波包变换相结合的处理方法,对于周期性窄带干扰,选取快速傅里叶变换来处理;对于白噪声,通过一种改进的阈值函数的小波包算法进行处理。实际应用结果表明,该方法去噪效果明显,不仅有效去除了局部放电脉冲信号中的噪声,可较好地保留了原始信号的有用信息。To remove the noise in the partial discharge signal collected by the information detection system of power cable intermediate joint,a method combined fast Fourier transform with improved wavelet packet transform is presented.For periodic narrowband interference,fast Fourier transform is selected to process.For white noise,it is processed by a wavelet packet algorithm with an improved threshold function.The result of practical application shows that the method can effectively remove the noise in the partial discharge pulse signal and retain the useful information of the original signal.

关 键 词：电缆中间接头 快速傅里叶变换 小波包变换 阈值函数 

分 类 号：TN911[电子电信—通信与信息系统]