开关柜局部放电超高频检测中周期性窄带干扰的抑制研究与应用  

Research on Suppression of Periodic Narrow-band Interference in UHF Partial Discharge Detection of Switchgear and Its Application

作　　者：李建明[1] 罗高[2] 王惠波[3] 

机构地区：[1]四川电力科学研究院,四川成都610072 [2]西华大学电气信息学院,四川成都610039 [3]广安电业局,四川广安638000

出　　处：《四川电力技术》2011年第6期46-49,69,共5页Sichuan Electric Power Technology

摘　　要：基于小波变换用于抑制开关柜局部放电在线检测中周期性窄带干扰的目的,提出了K-均值阈值算法来改进经典阈值法对窄带干扰频率的自适应性,现场实验结果表明,K-均值阈值算法能改善局部放电信号的提取效果,准确率高,波形失真小,对混频周期性窄带干扰具有较强抑制能力。For purpose of suppressing the periodic narrow - band interterence during on - line monitonng ol partial discharge （PD） in switchgear based on wavelet transform, K- means threshold algorithm is proposed to improve the self- adaptive of classic threshold for narrow - band interference frequency. The field experiments show that the proposed method can improve the extraction of partial discharge signal with a strong suppression of frequency - mixing periodic narrow - band interference, which has a high accuracy and small waveform distortion.

关 键 词：小波变换 周期性窄带干扰 K-均值 开关柜 局部放电 

分 类 号：TM855[电气工程—高电压与绝缘技术]