一起铁心夹件接地电流异常案例分析

Case Analysis of Abnormal Grounding Current of Iron Core Clamp

对于运行中的电力变压器,铁心夹件接地电流是反映其运行状态的重要参数,也是带电检测的重要试验项目。通过对铁心夹件接地电流的检测,发现一起夹件接地电流异常升高故障。通过试验数据,结合理论分析,并经过现场检查验证,确认是夹件引下线与变压器本体短路,形成环流通路,导致试验数据异常。

For power transformers in operation,the ground current of the iron core clip is an important parameter reflecting its operating state,and it is also an important test item for live detection.Through the detection of the grounding current of the iron core clamp,it is found that the grounding current of the clamp rises abnormally.Based on the test data,theoretical analysis and field inspection,it is confirmed that the clamp downlead was short circuited with the transformer body,forming a circulating circuit,which led to abnormal test data.