电压互感器铁磁谐振过电压的研究  

Study on Ferromagnetic Resonance Overvoltage of Voltage Transformer

作　　者：易成星[1] 杨伟[1] 朱文艳[1] 

机构地区：[1]南京理工大学自动化学院,江苏南京210094

出　　处：《电工电气》2013年第9期20-23,28,共5页Electrotechnics Electric

摘　　要：铁磁谐振会产生过电压现象,导致设备的绝缘破坏,影响系统的正常运行。利用电压互感器的伏安特性曲线分段拟合出铁心的铁磁特性曲线,采用MATLAB-SIMULINK软件对110 kV变电站的电磁式电压互感器与断路器断口电容串联产生的铁磁谐振进行仿真分析;在此基础上对消除此种铁磁谐振事故的三种方法 :使用电容式电压互感器、拆除断路器的断口电容、采用伏安特性好的电磁式电压互感器进行仿真分析,结果表明三种方法都能达到预期目的。Ferromagnetic resonance will generate overvoltage phenomena to cause insulation damages of equipment and to impact on normal operation of the system. The volt-ampere characteristic piecewise curves were used to get the ferromagnetic curve of iron core. MATLAB-SIMULINK software was adopted to carry out simulation analysis for ferromagnetic resonance by connecting 110 kV substation electromagnetic voltage transformer with circuit breaker fracture capacitor in series. On the basis of this, three kinds of methods, including voltage transformer using capacitor, fracture capacitors demolishing circuit breaker and electromagnetic voltage transformer with good volt-ampere characteristics, were adopted to eliminate ferromagnetic resonance. The result shows that the three kinds of methods all can reach the expected goal.

关 键 词：铁磁谐振 励磁特性 电磁式电压互感器 电容式电压互感器 消谐措施 

分 类 号：TM451[电气工程—电器]