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避雷器是一种重要的过电压保护装置,是电力系统安全运行的有力保障,其中,金属氧化物避雷器由于其具有优良的非线性和大流通容量等优点,在电网中广泛应用。金属氧化物避雷器带电测试在状态检修工作中,显示出它的巨大优势,避免了通常预试工作中试验周期间隔时间长,预试试验施加电压较低,试验条件与运行状态相差较大的缺点。但是无串联间隙的MOA如果有故障,问题会比有串联间隙的阀式避雷器更为严重。因此MOA的在线泄漏电流监测就显得尤为重要。
Surge arrester is an important overvoltage protection device, which is a strong guarantee for the safe operation of power system. Among them, MOA is widely used in power grid because of its excellent nonlinearity and large capacity. Metal oxide surge arrester live testing in the state overhaul work, showing its great advantages, to avoid the usual pre-test work cycle time interval, the pre-test voltage is lower, the test conditions and operating conditions, the larger the difference between the shortcomings . However, if there is a fault in the MOA without series gap, the problem will be more serious than the valve type surge arrester with series gap. Therefore, MOA online leakage current monitoring is particularly important.