一起220 kV金属氧化物避雷器带电检测数据异常的诊断分析

One Diagnostic Analysis of the Abnormal Data of Live Detection for 220 kV Metal Oxide Arrester

金属氧化物避雷器广泛应用于电力系统中,是电力系统过电压防护的主要设备,长期运行可能会出现发热、绝缘性能下降的缺陷。介绍了一起利用红外热成像、阻性电流测试等带电检测技术发现避雷器内部受潮缺陷的典型案例,通过例行试验数据分析的手段,初步判断避雷器内部存在受潮的结论,经过解体检查后确认与试验数据分析结果一致,并分析了故障产生的原因,最后为避雷器日常运维管理工作提出了建议。

The metal oxide arrester is widely used in power system.It's the main protection device avoiding over voltage.But after long running,it's insulation maybe decrease because of heating.This paper introduces an classical case that using live detection technologies such as Infrared Thermography and resistive current detection etc to find the damp fault inside the arrester.Through the analysis of the routine tests datas,judge the damp fault inside the arrester firstly.Then dismantle the arrester to prove the analysis right and analyze the reason of the fault.At last give some advices for routine operation and maintenance.