基于27.5kV永磁机构开关的优化设计

Optimization Design of 27.5 kV Permanent Magnetic Actuator Switch

针对应用于铁道牵引供电系统中27.5 kV真空负荷开关的永磁机构铁心行程长、刚合速度过大、分闸时间长,笔者提出一种单线圈单稳态永磁机构:优化设计了永磁机构的动铁心和线圈,达到提高合闸可靠性、适当降低刚合速度以及减小分闸时间的目的;应用电磁场有限元分析方法对永磁机构进行优化设计,并给出了优化设计方案及测试结果。试验结果证明,该永磁机构优化结果达到了设计要求,同时也验证了该方法的可行性。

A monostable permanent magnetic actuator with single coil is designed for the 27.5 kV vacuum switchgear in railway traction power supply system to reduce the stroke length of ferrite core, the just-closing speed and the switching time of the original permanent magnetic actuator. The moving core and coil of the new actuator are optimized with finite element analysis. The optimization scheme is discussed, and test is conducted. Test result shows that the new monostable permanent magnetic actuator meets the design requirements.