磁性材料在永磁饱和型故障限流器中的应用

首先介绍了永磁饱和型FCL的基本结构和工作原理,指出永磁体和软磁铁心材料的选择至为重要.通过综合比较分析多种永磁和软磁材料的磁性能、力学性能和经济性,提出了磁性材料的选择原则:高压大容量FCL可选择钕铁硼或稀土钻作为永磁体的待选材料,小容量FCL则考虑使用永磁铁氧体;铁硅合金和非晶态合金可作为软磁铁心的待选材料.磁性材料的温升效应、永磁体磁后效现象以及磁性材料工作点的优化配合等,是亟待研究的关键技术问题.

Application of Magnetic Materials in Permanent Magnet-Biased Saturated Iron Core Fault Current Limiter

The fundamental structure and operational principle of the permanent magnet-biased saturated iron core fault current limiter (PMFCL) are elucidated, which indicates the adopted materials for both permanent magnet and iron core are of utmost significance. After comprehensive and comparative analysis with regards to different kinds of permanent magnet and soft magnetic materials in magnetic, mechanical and economic properties, a rule of thumb is presented for magnetic material selection, i.e. Nd-Fe-B or rare earth-Co alloy are recommended as permanent magnet candidates for high-power applications, while magnetic ferrite material is recommended for small-capacity design; Fe-Si alloy and amorphous alloy are recommended as soft magnetic material candidates for the iron core. Some pending key issues are also proposed for further investigations, such as side effect of temperature rise in magnetic materials, magnetic aftereffect of the permanent magnet, optimized cooperation of the operational knee points in magnetic materials, etc.