特高压站避雷器泄漏电流在线监测和分析系统

On-Line Monitoring and Analysis System of Lightning Arrester Leakage Current in UHV Substation

在线采集避雷器泄漏电流,研究避雷器智能预警算法,提前预警避雷器缺陷。本文设计一种基于时间序列和趋势分析的特高压变电站避雷器缺陷预警系统,该系统采用无源零磁通互感器采集避雷器泄漏全电流并通过LoRa无线通信传输给通信中继单元,通信中继单元采集对应母线CVT信号结合全电流数据计算阻性电流,通信中继单元将监测和计算数据通过第二级LoRa无线通信传输给系统后台,系统后台对采集的数据进行存储和分析。该系统在特高压交流变电站进行安装验证,结果表明:设备安装快捷,施工方便,降低现场施工风险;监测数据准确,成功预警避雷器缺陷,保障电网安全稳定运行。

By on-line acquisition of lightning arrester leakage current,research of intelligent lightning arrester early warning algorithm,early warning of lightning arrester defects. surge arrester defect early warning system based on time series and trend analysis for UHV substation. The system uses passive zero flux transformer to collect full current and transmits it to communication relay unit through LoRa wireless communication. Communication relay unit collects voltage signal of corresponding bus CVT and calculates resistance current with full current data. Communication relay unit will monitor and calculate data. The second level LoRa communication unit transmits data to the system background,which stores and analyses the collected data. The system has been installed and verified in UHV AC substation. The results show that equipment installation construction,construction risk reducedmonitoring data is accurate,arrester defects are successfully,safe and stable operation of power grid.