覆雪冻融过程氧化锌避雷器泄漏电流测试分析

Analysis on Leakage Current Detection of ZnO Surge Arrester during a Snow Covered Freeze-Thaw Process

为了弄清覆雪冻融过程氧化锌避雷器泄漏电流情况,本文通过模拟户外条件,测量了氧化锌避雷器的泄漏电流,通过对比避雷器的阻性电流和容性电流,来分析覆雪冻融过程避雷器的泄漏电流影响因素。研究结果表明:1)避雷器的阻性电流和容性电流分别随着环境温度和覆雪水的电导率呈饱和上升趋势;2)环境温度在-2℃左右时,电导率在500μs/cm左右,避雷器的阻性电流和容性电流之间存在动态平衡。文中针对覆雪冻融过程氧化锌避雷器的闪络风险,提出了相应的应对措施。相关的研究结果可为新疆区域的氧化锌避雷器运行提供参考。

In order to get the leakage current features of snow covered zinc oxide surge arrester withfreeze-thaw process,outdoor condition was simulated to measure leakage current of zinc oxide surge ar-rester. Through comparing the resistive and capacity current to analyze the influence factors of leakagecurrent of zinc oxide surge arrester during freeze-thaw process. The results show that： 1）capacity currentand resistance current of the arrester show a saturated upward trend with the ambient temperature and theconductivity of the snow-covered water,respectively;2）When the ambient temperature is around-2 ℃,the electrical conductivity is about 500 μs/cm. There is a dynamic balance between the resistive currentand the capacitive current of the lightning arrester. The corresponding countermeasures are put forward toprevent flashover risk of arrester with freeze-thaw process. Relevant results can provide references for theoperation of zinc oxide arrester in Xinjiang region.