一起500 kV避雷器内部受潮故障特征与诊断分析

The Internal Damp Fault Characteristics and Diagnosis Analysis of a 500 kV Lightning Arrester

金属氧化物避雷器是电力系统中重要的防雷和过电压保护设备,开展带电检测可有效地保证避雷器安全稳定运行。介绍了一起新投运的500kV金属氧化锌避雷器数据异常的典型案例,通过在线监测、带电检测、停电诊断性试验确认了避雷器内部存在严重故障,经解体检查发现,避雷器上节顶部主盖板橡胶密封圈安装质量不佳致使避雷器内部发生严重积水受潮是避雷器内部故障的直接原因。指出针对新投运设备建议加强监控力度,以便及时有效地发现潜在缺陷,避免设备发生爆炸等严重安全事故。

MOA is a piece of crucial equipment for lightning protection and overvoltage protection in power systems,and carrying out live detection could effectively ensure the safe and stable operation of the arrester.This paper introduced a typical case of abnormal data of a 500kV metal zinc oxide arrester which was put into operation newly.It has been confirmed that there was a severe fault inside the arrester through online monitoring,live detection,and power failure diagnostic tests.After disintegration inspection,it was found that the poor installation quality of the rubber sealing ring of the main cover on the top of the upper section of the arrester caused serious water accumulation inside the arrester,and dampness is the direct cause of the internal failure of the arrester.This paper points out that it is necessary to strengthen the monitoring of the new equipment to detect potential defects in time and avoid serious safety accidents such as equipment explosions,etc.