摘要
电容式电压互感器是变电站内重要的检测和保护设备。本文通过分析其运行时多类型故障,为电容式电压互感器的设计、运行、维护等提供了相关建议。首先,对500 kV、±500 kV及1000 kV变电站内电容式电压互感器运行中出现的5类典型故障及1类误诊断现象进行分析;其次,根据现场电压互感器故障实例,结合其工作原理、运行条件、诊断数据、厂内解体情况等对电容式电压互感器漏油、电容单元异常、电磁单元异常等故障产生原因进行分析;最后,针对介损电桥自激法误判问题,文中通过理推算分析其产生原因,并依托Matlab/Simulink仿真模型、现场测试等试验方式进行验证,试验结果与理论推算相吻合。
Capacitive voltage transformer is an important detection and protection equipment in substation.In this paper,related suggestions of such aspects as design,operation and maintenance of the capacitive voltage transformer are provided through analysis of the multiple types of faults of the capacitive voltage transformer in operation.Firstly,5 types of typical fault and 1 type of misdiagnosis phenomena of capacitive voltage transformers in 500 kV、±500 kV and 1000 kV substations are analyzed.Then,the causes of such faults as oil leakage of the capacitive voltage transformer,abnormity of capacitor unit and electromagnetic unit are deeply analyzed in accordance with the real fault example of the voltage transformer at site and also in combination with its working principle,operating condition,diagnostic data and disassembly at the factory etc.Finally,as for the misjudgement of self excitation of dielectric electric bridge,the cause of its occurrence is analyzed by reasonable calculation,and verified by Matlab/Simulink simulation model and field test.The experimental results are consistent with the theoretical calculation.
作者
陈东明
王建伟
李旸
商力新
王燚增
冉自强
高全
韩明礼
CHEN Dongming;WANG Jianwei;LI Yang;SHANG Lixin;WANG Yizeng;RAN Ziqiang;GAO Quan;HAN Mingli(Ultra High Voltage Branch of State Grid Jibei Electric Power Co.,Ltd.,Beijing 102488,China)
出处
《电力电容器与无功补偿》
2024年第6期36-43,共8页
Power Capacitor & Reactive Power Compensation
关键词
电容式电压互感器
故障
电容单元
电磁单元
电压异常
自激法
capacitive voltage transformer
fault
capacitor unit
electromagnetic unit
abnormal voltage
selfexcitation
