摘要
文中介绍了红外检测过程中发现的一起35 k V避雷器缺陷,对避雷器进行持续运行电压下泄漏电流测量,发现阻性电流偏大。更换后对其进行外观检查、绝缘电阻检测、直流1 m A下的参考电压U1m A和0.75U1m A下的泄漏电流测量,发现故障相泄漏电流检查异常,解体后发现故障原因为环氧筒内壁受潮引起。针对此次缺陷提出了加强避雷器工艺管控、加强在役设备巡检、湿度较大时进行红外精确测温等建议。
This paper introduces a hidden 35 k V MOV defect detected by infrared detector. It is found that the MOV leakage current measurement under continuous operating voltage is large. After replacing its visual inspection, the insulation resistance testing and leakage current measurement to the voltage U1 m A and 0.75U1 m A under 1m A DC reveals that the leakage current is abnormal. The MOV disintegration shows that the MOV is damp. According to the detection, it is recommend to strengthen the process control of MOV and deploy infrared temperature measurement when humidity is high.
出处
《江苏电机工程》
2016年第2期84-86,共3页
Jiangsu Electrical Engineering
关键词
避雷器
带电检测
红外检测
解体
缺陷分析
MOV
on-line detection
infrared detection
disintegration
defect analysis
