金属氧化物避雷器带电测试干扰分析

金属氧化物避雷器带电测试相比传统的停电直流测试具有极大的优势,但周围带电设备对被试避雷器的影响以及避雷器自身存在的相间干扰则是目前带电测量方式遇到的最大困扰。针对普遍存在的"一"字形排列避雷器,分析了其在外界干扰环境下的持续电流特性,指出在现场干扰条件下是无法准确测得泄漏电流的阻性分量的,而避雷器带电测试的关键是确定阻性电流的增量。

Study on Interphase Interference to On-line Measurement of Metal Oxide Arrester

On-line measurement of metal oxide arrester is superior in many respects to conventional off-line DC test.However,on-line measurement faces the interference from the electriferous equipments around MOA and the interphase interference from MOA itself.For the MOAs that are generally arranged in line,this paper analyzes the leakage current characteristic of the MOAs under the interfering environment.The result shows that the resistive component of leakage current of MOA is difficult to be accurately measured under the interfering environment.While measuring the increment of the resistive current is the key to on-line measurement of MOA.