CVT电容分压器末端放电故障分析  

Analysis of Discharge Fault at End Screen of CVT Capacitor Voltage Divider

作　　者：吴奇松 夏君宇 赵国庆 杜晓平 李涛 WU Qisong;XIA Junyu;ZHAO Guoqing;DU Xiaoping;LI Tao(Dalian North Transformer Group Co.,Ltd.,Dalian 116200,China;State Grid Shandong Electric Power Company,ji'nan 250001,China)

机构地区：[1]大连北方互感器集团有限公司,辽宁大连116200 [2]国网山东省电力公司,山东济南250001

出　　处：《变压器》2024年第1期62-65,共4页Transformer

摘　　要：电容式电压互感器(CVT)具有绝缘裕度大、抗谐振强度高等优点,在电力系统中得到广泛运用,维护其正常运行是保障电力系统可靠性的必要条件之一。CVT是由电容分压器和电磁单元组成,由于结构相对复杂,在运行过程中会出现各种各样的问题,其中以CVT本体发生异常放电并导致漏油的故障较为突出。本文通过对一台110kV CVT电容分压器末端发生放电并导致漏油的产品进行解体分析和试验验证,得出了故障原因,并提出了改善措施。Capacitive voltage transformers(CVT)have the advantages of large insulation margin and high anti resonance strength,and are widely used in power systems.Maintaining their normal operation is one of the necessary conditions to ensure the reliability of power systems.CVT is composed of a capacitive voltage divider and an electromagnetic unit.Due to its relatively complex structure,various problems may arise during operation,among which the CVT body experiences abnormal discharge and leads to oil leakage,which is more prominent.This article conducts disassembly analysis and experimental verification on a 110kV CVT capacitor voltage divider that experienced discharge at the end and caused oil leakage.The cause of the failure is obtained and the improvement measures are presented.

关 键 词：电容分压器 末端放电 放电电压 改善措施 

分 类 号：TM451[电气工程—电器]