核电主变启动试验异常放电原因分析及处理

Analysis and solution of abnormal discharge in energizing test for main transformer in nuclear power station

以某核电站在进行主变启动试验时发生高压套管末屏异常放电现象为例,介绍了主变启动试验异常放电的发生过程,以及从快速暂态过电压和变压器高压套管末屏结构角度,查找异常放电原因,评估了异常放电带来的风险,并提出了相应的处理措施。

Taking the example of abnormal discharge of high voltage bushing end screen in energizing test for main transformer in nuclear substation, this paper introduced the process of abnormal discharge occurring during the energizing test for main transformer, analyzed the reason for abnormal discharge from the angle of the very fast transi- ent over - voltage （VFTO） and the structure of high voltage bushing end screen of main transformer, evaluated the risk of abnormal discharge, and proposed the treatment strategy.