避雷器在线测量数据偏差现象分析及对策

Analysis and countermeasures of deviation in on-line measurement data of lightning arrester

针对氧化锌避雷器监测设备现场实际运行情况分析及针对性试验,探讨了阻性电流等在线监测参量主要受气象环境及工频电场的影响造成设备误告警的问题。根据避雷器初始运行性能良好且不会同时劣化的原则,提出了基于对称分量法的避雷器初始化泄漏电流及夹角的计算方法,进而得出各相真实泄漏电流及夹角以抑制工频电场的干扰影响,并在此基础上对阻性电流进行中值滤波及日最小值最小二乘拟合,采用拟合后的阻性电流值结合预警阈值等进行综合判断,消除气象因素造成的误告警问题。验证表明,该方法可有效消除气象环境及工频电场对避雷器阻性电流的影响,提高避雷器监测设备的预警可靠性。

Based on the analysis and targeted test of the actual operation of the monitoring equipment of zinc oxide arrester,the problem of equipment false alarm caused by the influence of meteorological environment and power frequency electric field on the on-line monitoring parameters such as resistive current is discussed.According to the principle that the initial operation performance of arrester is good and will not deteriorate at the same time,a calculation method of initial leakage current and included angle of Arrester Based on symmetrical component method is proposed,and then the real leakage current and included angle of each phase are obtained to suppress the interference effect of power frequency electric field.On this basis,median filtering and least square fitting of daily minimum value are carried out for resistive current,and the fitted resistive current value is combined with early warning threshold for comprehensive judgment to eliminate the false alarm caused by meteorological factors.The verification shows that this method can effectively eliminate the influence of meteorological environment and power frequency electric field on the resistive current of arrester,and improve the early warning reliability of arrester monitoring equipment.