Operating property analysis of a new high-speed DC switch repulsion mechanism

Air DC switch has been widely used with the development of DC power system, while the limited speed of available DC switch mechanism has become the bottleneck of some key equipments and facilities development of industry. This paper focuses on the research of a new high-speed DC switch repulsion mechanism with experimental and simulation methods. Coupled with some key multi-physical equations, the numerical model was built. For the reason of accuracy, skin effect and the proximity effect caused by the current in the coil are also taken into account. According to the simulation results, which indicate several key parameters severely affecting the mechanism speed, a high-speed DC switch repulsion mechanism is developed. By the test of mechanism motion, its average speed can be up to 8.4m/s and its mechanism response time is 250us, which verifies the simulation results. Furthermore, during high speed motion the stress on the metal plate and moving contact is also discussed. It is noticed that the influence of the material deformation on the mechanical motion is very important.