一起电容式电压互感器二次电压异常升高故障分析  

Analysis of an Abnormal Secondary Voltage Rise Fault of Capacitive Voltage Transformer

作　　者：董超群 王悦 黄银龙 莫祥 李夏 赵胜男 DONG Chaoqun;WANG Yue;HUANG Yinlong;MO Xiang;LI Xia;ZHAO Shengnan(State Grid Henan Extra High Volatge Company,Zhengzhou 450000,China;State Grid Henan DC Center,Zhengzhou 450000,China)

机构地区：[1]国网河南省电力公司超高压公司,河南郑州450000 [2]国网河南省电力公司直流中心,河南郑州450000

出　　处：《电工技术》2022年第15期183-184,188,共3页Electric Engineering

摘　　要：介绍了一起电容式电压互感器二次电压异常升高故障案例。通过外观检查、停电试验、油色谱分析等手段判断故障原因。解体检查后,发现电磁单元谐振电容器膨胀变形,电容器上端接线柱触碰到中间变压器调压板,与一次侧绕组发生短接,引起二次电压升高。最后提出通过监测电容式电压互感器二次电压、红外测温、观察油位等方式,及时发现电容式电压互感器内部缺陷,预防类似事故的发生。A fault case of secondary voltage abnormal increase of capacitive voltage transformer is introduced.Through appearance inspection visual inspection,power failure test and oil color spectrum analysis,the fault cause is analyzed by using the test data.After the disassembly inspection,it isfound that the resonant capacitor of the electromagnetic unit expanded and deformed,and the upper terminal post of the capacitor touches the middle transformer pressure regulating plate,which is short connected with the primary side winding,resulting in the two voltage rise.Finally,it is proposed to find the internal defects of capacitive voltage transformer in time and prevent similar accidents by monitoring the secondary voltage of capacitive voltage transformer,infrared temperature measurement and oil level observation.

关 键 词：电容式电压互感器 电磁单元 二次电压 谐振电容器 

分 类 号：TM451.2[电气工程—电器]