一种适用于降低避雷器在线监测相间干扰的处理方法  

A Method for Reducing Interphase Interference for On-Line Monitoring of MOA

作　　者：梁武民[1] 毛丽娜[1] 曾国辉[1] LIANG Wumin;MAO Lina;ZENG Guohui(Xuji Group Corporation,Xuchang 461000,China)

机构地区：[1]许继集团有限公司,河南许昌461000

出　　处：《电瓷避雷器》2021年第3期81-85,共5页Insulators and Surge Arresters

摘　　要：提出一种适用于降低避雷器在线监测装置相间干扰的处理方法,针对相间干扰导致监测数据差异较大的问题,首先提取零序电流分量反映相间干扰的强度及方向;其次为降低空间干扰电流的影响,提取以B相电流为基准的正序电流分量,从而得到B相真实泄漏电流信息;最后基于初始运行时避雷器各相特性基本一致的特点,实现A相和C相干扰的去除。实际应用中基于初始运行时刻的校正数据及对应电流幅值和夹角变化量实现对避雷器在线监测数据的校正。相关对比验证表明本方法可实现避雷器在线监测数据的校准和定值的修定,间接提高装置预警的可靠性。A method of dealing with electromagnetic interference applied to on-line monitoring device of lightning arrester is proposed. To solve the problem of large difference of monitoring data caused by electromagnetic interference,zero sequence current component is extracted to reflect the intensity and direction of inter-phase interference. Aiming to reduce the effect of space interference current,the positive sequence current component based on phase current of B is extracted,then the real leakage current information of phase B can be obtained. Finally,the phase A and phase C interference can be removed based on the fact that the characteristics of each phase of the arrester are basically the same in the initial operation. In practical application,the on-line surge arrester monitoring data are corrected based on the initial running time data and the corresponding current amplitude and angle variation. Relevant comparison shows that this method can calibrate the on-line monitoring data of arresters and indirectly improve the reliability of device early warning.

关 键 词：避雷器 在线监测 电磁干扰 阻性电流 对称分量法 

分 类 号：TM862[电气工程—高电压与绝缘技术]