Muti-Field Analysis of Novel Axial Magnetic Field Contacts for Vacuum Interrupters
|School||Shenyang University of Technology|
|Course||Motor and electrical|
|Keywords||Vacuum interrupter Longitudinal magnetic field Asymmetric - contact structure 3D magnetic field simulation|
Vacuum circuit breaker is widely used in the power system, limit breaking performance as a vacuum breaker vacuum interrupter of the core components of a direct impact on the performance of the vacuum breaker. More extensive application of vacuum interrupter contact magnetic field structure in portrait or landscape, in order to improve the vacuum breaker breaking capacity limit. The vacuum interrupter contact structure having a longitudinal magnetic field when breaking the short-circuit current, can be such that the vacuum arc in its spread form limiting current is improved, and the diffusion morphology vacuum arc will be conducive to the vacuum arc is extinguished, thus contributing to improve the vacuum breaking capacity of the circuit breaker. This paper presents a novel asymmetric structure of longitudinal magnetic field contacts, the significant difference is that the the asymmetric longitudinal magnetic field of the contact structure with traditional symmetric longitudinal magnetic field contactor structure has single: static contact contact system side pole magnetic field coil, moving contact side without any coil, the vacuum interrupter fracture between the longitudinal magnetic field is entirely generated by the static contact side of the magnetic field coils. Stationary contact belong to the stationary member, the more complex the longitudinal direction of the magnetic field coil is disposed on the stationary contact, the movable contact for movement in the process of breaking, or as close as possible to simplify the structure, reduce the quality of the movable contact and improve contact breaking speed. Through the use of this asymmetry contact structure of longitudinal magnetic field, in the assurance required under conditions of longitudinal magnetic field, can greatly improve the mechanical strength of the vacuum interrupter contacts, which will help improve the life of the vacuum breaker. In this paper, three-dimensional finite element method is novel asymmetric structure of longitudinal magnetic field contacts simulation analysis, and two kinds of programs to improve the longitudinal magnetic field strength: a program is stationary contact side plus core another program flat-series coil structure of the outer and inner layers. Vertical contact structure in the longitudinal magnetic field strength limit minute power outage shed its distribution, as well as breaking current zero-crossing the residual field simulation analysis of the vacuum interrupter. The results showed that the novel asymmetric contact structure of a longitudinal magnetic field and its improved both structures with a strong magnetic field strength and a relatively uniform magnetic field distribution, the small lag time of its residual magnetic field, the resistances of the conductors of the contact system can be controlled In the scope of the smaller horizontal.