基于相位变换法的MOA阻性电流检测与故障诊断相关系数法研究  

Research on Resistive Current Detection of MOA Based on Phase Transformation Method and Correlation Coefficient Method of Fault Diagnosis

作　　者：赵海鹏 唐邦义 谷倩倩 石海珍 俞璐 潘吟泓 ZHAO Haipeng;TAGN Bangyi;GU Qianqian;SHI Haizhen;YU Lu;Pan Yinhong(Maintenance Branch of State Grid Xinjiang Electric Power Co.,Ltd.,Urumqi 830002,China;Jiaxing Dasong Intelligent Technology Co.,Ltd.,Jiaxing 314001,China)

机构地区：[1]国网新疆电力有限公司检修公司,新疆乌鲁木齐830002 [2]嘉兴市大宋智能科技有限公司,浙江嘉兴314001

出　　处：《电工技术》2020年第3期42-45,50,共5页Electric Engineering

摘　　要：金属氧化物避雷器(MOA)老化后泄漏电流会发生明显变化,尤其是阻性分量,因此通过检测阻性电流的变化可判断MOA是否故障。针对MOA运行现场实测的泄漏电流幅值小,易受噪声干扰的问题,采用自适应阈值小波分解方法滤除噪声。在试验室进行MOA人工受潮试验获取故障样本,探究MOA受潮老化后泄漏电流的变化特征,分析得到MOA受潮老化的诊断方法。通过相位变换法从泄漏电流中提取阻性电流,借助傅里叶变换获取阻性电流的各次谐波,采用单相阻性电流基波峰值与出厂值纵向比较和相间阻性电流相关系数横向比较方法综合诊断MOA故障。The leakage current of MOA will change obviously after aging,especially the resistance component.The fault of MOA can be judged by detecting the change of resistive.In this paper,the method of adaptive threshold wavelet decomposition was used to reduce noise in order to solve the problem of small leakage amplitude of current and vulnerability to noise interference in site.Fault samples were obtained by artificial damp experiment in the laboratory.The change characteristics of leakage current of MOA after damp were studied,and the diagnostic method of damp aging of MOA was analyzed.The resistive current was extracted from leakage current by phase transformation method,and the harmonics of resistive current were obtained by Fourier transform.Comprehensive diagnosis of MOA fault was carried out by longitudinal comparison of fundamental wave peak value and factory value of single-phase resistive current and transverse comparison of correlation coefficient of interphase resistive current.

关 键 词：金属氧化物避雷器(MOA) 受潮老化 自适应阈值小波降噪 阻性电流检测 相关系数法 

分 类 号：TM855[电气工程—高电压与绝缘技术]