局部放电超高频检测抗干扰与多源放电信号分离方法  

A Method for Anti-Interference and Multi-Source Discharge Signal Separation in Ultra High-Frequency Partial Discharge Detection

作　　者：王彩雄 唐志国 常文治 郑书生 李成榕 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《电网技术》2012年第3期46-50,共5页Power System Technology

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB724508)~~

摘　　要：变电站的电磁环境复杂,存在大量处于超高频(ultrahigh-frequency,UHF)段内的通讯干扰信号及设备外部的脉冲型干扰信号,导致难以对局部放电故障现场检测结果进行准确的诊断。针对局部放电UHF检测中的抗干扰问题,提出了一种基于波形互相关分析、噪声传感器及幅比聚类分析的局部放电UHF综合抗干扰技术,试验证明这种抗干扰技术可有效排除通讯干扰、设备外部脉冲型干扰,并实现设备内部多放电源辐射的超高频信号的分离与识别,提高局部放电检测与诊断的有效性与准确性。The electromagnetic environment of substation is complicated, a great variety of ultra high-frequency （UHF） interference signals caused by communication and pulse interference signals outside power equipments cause difficulties to accurately diagnose the test results of on-site detection of the faults caused by partial discharge （PD）. In allusion to the interference problem during the UHF detection of PD, a comprehensive anti-interference approach, which is based on cross-correlation analysis of waveforms, noise sensor and clustering analysis of amplitude ratio, is proposed. Test results show that the proposed anti-interference approach can suppress the interference caused by communication and pulse interference signals outside power equipments, and the proposed approach can also effectively separate and recognize UHF signals caused by multi PD source radiation inside the equipment, thus the effectiveness and accuracy of PD can be improved.

关 键 词：局部放电 超高频(UHF) 抗干扰 幅比聚类 信号分离 

分 类 号：TM85[电气工程—高电压与绝缘技术]