一起500kV电容式电压互感器二次电压异常的故障分析  

Fault Analysis of an Abnormal Secondary Voltage of 500kV Capacitive Voltage Transformer

作　　者：王法顺 周刚 李伟琦 张知宇 沈宇辉 WANG Fa-shun;ZHOU Gang;LI Weiqi;ZHANG Zhi-yu;SHEN Yu-hui(State Grid Jiashan Power Supply Company,Jiaxing 314100,China;State Grid Jiaxing Power Supply Company,Jiaxing 314000,China;State Grid Haiyan Power Supply Compony,Jiaxing 314300,China)

机构地区：[1]国网浙江省电力有限公司嘉善县供电公司,浙江嘉兴314100 [2]国网浙江省电力有限公司嘉兴供电公司,浙江嘉兴314000 [3]国网浙江省电力有限公司海盐县供电公司,浙江嘉兴314300

出　　处：《电气开关》2022年第2期105-108,共4页Electric Switchgear

摘　　要：本文分析了一起500kV电容式电压互感器(CVT)二次电压异常的事件。文中介绍了CVT二次电压异常的事件概况和设备情况,并分别对设备进行了现场检查、监控后台检查、停电后现场检查以及返厂解体检查,找出CVT二次电压异常的原因为CVT的密封圈未装配到位使得下节电容器绝缘油渗漏导致电容单元露空,绝缘强度下降而被击穿。最后结合设备的选择、设备验收、设备的日常巡视以及高压试验给出了防范措施建议。This paper analyzes an abnormal secondary voltage event of 500 kV capacitive voltage transformer(CVT).This paper introduces the event overview and equipment situation of CVT secondary voltage abnormality, and carries out on-site inspection, monitoring background inspection, on-site inspection after power failure and disassembly inspection after returning to the factory respectively.It is found that the cause of CVT secondary voltage abnormality is that the sealing ring of CVT is not assembled in place, resulting in the leakage of insulating oil of the lower capacitor, resulting in the exposure of capacitor unit and the breakdown of insulation strength.Finally, combined with the selection of equipment, equipment acceptance, daily inspection of equipment and high-voltage test, preventive measures and suggestions are given.

关 键 词：电容式电压互感器 二次电压异常 故障分析 

分 类 号：TM451[电气工程—电器]