A new 27. 5 kV split-phase monostable permanent magnetic mechanism with a directly connected arcing chamber was designed to solve the problem of excessive switching current for permanent magnetic mechanism of a 27. 5 kV vacuum circuit breaker. Finite element analysis software was used to simulate the static and dynamic characteristic of a new type of monostable permanent-split magnetic actuator. Compared with the traditional one-piece, the three-phase permanent magnet mechanism could realize split-phase operation and synchronous closing. Ansoft Maxwell software simulation and prototype test showed that the new mechanism could perform effective switching, and effectively reduce the switching current.%针对27．5 kV真空断路器永磁机构分合闸电流过大的问题，设计一种27．5 kV分相式单稳态永磁机构，新型永磁机构直接与灭弧室相连.利用有限元分析软件对新型单稳态永磁机构进行了静态和动态仿真分析.与传统三相一体式永磁机构相比，该机构可以实现分相操作和同步分合闸.利用 Ansoft Maxwell软件对永磁机构进行仿真研究并进行样机试验，结果表明，新型机构可以有效分合闸，且有效减小了分合闸电流.
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