特高压交流金属氧化物避雷器在线监测装置研制

Development of On-Line Monitoring Device for UHV AC Metal Oxide Arrester

为了分析特高压交流避雷器的状态,给出准确的判断依据,提出一种适合特高压交流避雷器绝缘状态的在线监测方法,利用精密小电流互感器采样方式,在不需电压的方式下,基于谐波分析法直接计算出避雷器泄漏电流、阻性电流值;采用高频互感器感应放电电流的方式,能够准确测量出避雷器动作的发生。研制出应用于750kV等级以上的交流避雷器绝缘状态在线监测装置,符合特高压交流避雷器监测器的标准规范,具有本地显示、远程通讯、数据存储等功能,能够及时发现避雷器老化或受潮问题,防止故障的发生。

In order to analyze the UHV arrester insulation condition,an accurate judgment criteriais given,an on-line monitoring method suitable for extra high voltage AC arrester insulation is proposed,using precision small current transformer sampling method,reference voltage mode is not need,based onharmonic analysis method is used to directly calculate the lightning arrester leakage current and resistivecurrent value;using high frequency transformer induction discharge current can accurately measure theoccurrence of lightning arrester action. Developed for 750kV and above the level of the AC arrester insu-lation state on-line monitoring device,meet to the Standard Specification for UHV AC arrester monitor,with local display and remote communication,data storage and other functions,and a timely manner ar-rester aging or moisture problems can be found to prevent the failure.