一种开路形式的永磁饱和型故障电流限制器的温度场稳态分析  

Steady Analysis of the Temperature Field of an Open Circuit Permanent Magnets Saturated Fault Current Limiter

作　　者：李琳[1] 王川陵 LI Lin;WANG Chuanling(North China Electric Power University,State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,Beijing 102206,China)

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《高压电器》2018年第9期19-24,31,共7页High Voltage Apparatus

基　　金：国家自然基金资助项目(51277064)~~

摘　　要：永磁饱和型故障电流限制器(PMFCL)具有结构简单、损耗小和运行成本低的特点,具有良好的应用前景。永磁体在高温下会失磁,因此开展PMFCL温度场的计算分析有重要的实际意义。针对一种直线型的PMFCL结构,使用有限元软件进行磁场分析得出铁心在一个周期内的磁感应强度随时间变化的B-t曲线,再根据铁心的B-P曲线计算其损耗,并考虑永磁体的损耗,分析线路正常工作状态和故障状态保持持续的极端情况下永磁饱和型故障电流限制器的稳态温度场,仿真结果发现该新型的限流器的永磁体在线路正常工作状态和故障状态下均处于未失效的磁性状态的温度范围内,从而处于两个稳态中间的故障过渡过程中PMFCL的永磁体满足设计的温度和磁性性能要求,验证了此PMFCL具有很好的磁场热稳定性。An open circuit permanent magnets saturated fault current limiter has the advantages of simple structure, low loss and low operating cost, and so that it has a good applied prospect. Permanent magnets may lose their magnetization at high temperatures. Therefore, it is great practical significant to carry out calculation and analysis of PMF- CL temperature field. For a linear PMFCL, the B-t curve of the magnetic flux density of a core over a period of time is obtained by using finite element software to analyze the magnetic field, and then the loss is calculated according to the B-P curve of the core, and the loss of the permanent magnet is taken into consideration to analyze the tempera- ture field at the conditions in which the normal working state and the extreme continuous fault state of the bus. The results of simulation shows that the permanent magnets of the novel current limiter are all in the temperature range of good magnetic state at the normal working state and the extreme continuous fault state of the bus, and thus during the transition of the bus fault in the middle of two steady states, PMFCL meets design temperature and magnetic properties so that this PMFCL has good thermal stability of magnetic field.

关 键 词：故障电流限制器 铁心 永磁体 温度场 磁稳定性 

分 类 号：TM471[电气工程—电器]