摘要
为区分变压器套管末屏高频局部放电信号来源,搭建含了电容屏撕裂缺陷套管和可拆装的针板放电缺陷模型的实验装置,采用在不同位置施加校准脉冲激励和高电压激发缺陷的实验方法,对变压器套管末屏耦合高频脉冲信号进行时频分析,同时比较了基于短时傅里叶变换、同步压缩小波变换、同步提取变换方法的时频图谱对信号传输路径的区分效果,并提出了时频图谱后处理方法。研究表明:利用传输过程对高频局部放电信号时频分析谱图的影响可以区分信号来源;与同步压缩小波变换、短时傅里叶变换相比,同步提取变换产生的时频图谱能更好地区分信号来源。
In order to distinguish the high-frequency partial discharge signal coupled from power transformer bushing tap,which generated in a tank or in a bushing,an experimental device containing a bushing with a capacitor shield tearing defect and a detachable needle-plate discharge defect model was constructed.The high-frequency partial discharge signals were generated by applying calibration pulse and high voltage on defects at different positions,and were coupled from power transformer bushing tap.Three methods of time-frequency analysis,based on short-time Fourier transform,synchro squeezed wavelet transform,and synchro extracting transform,were proposed to analyze these signals.The time-frequency spectrum distinguishable effects of three methods were compared,and a time-frequency spectrum post-processing method was proposed.The research shows that the sources of high-frequency partial discharge signals can be distinguished by their time-frequency spectra,which are influenced by transmission paths.Meanwhile,compared to the synchro squeezed wavelet transform,and the short-time Fourier transform.The time-frequency spectra generated by the synchro extracting transform are better for signal sources distinction.
作者
刘诣
谢雄杰
罗晓庆
张连星
杜振波
LIU Yi;XIE Xiongjie;LUO Xiaoqing;ZHANG Lianxing;DU Zhenbo(State Grid Electric Power Research Institute,Wuhan 430074,China;China Electric Power Research Institute,Wuhan 430074,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2020年第2期594-602,共9页
High Voltage Engineering
基金
国家电网公司总部科技项目(GY71-15-038).
关键词
套管末屏
高频
局部放电
时频分析
同步提取变换
bushing tap
high-frequency
partial discharge
time-frequency analysis
synchro extracting transform
作者简介
通信作者:刘诣,1980—,男,高工,主要从事局部放电方面的研究及检测装置的研发、输变电设备状态监测及故障诊断技术的研究工作,E-mail:liuyi@sgepri.sgcc.com.cn
