A new model for Thomson-type actuator including the pressure buffer

Abstract

The motion characteristics and flow field variation of Thomson-type actuator have been investigated in this article, in which a two-dimensional axisymmetric cylindrical coordinate model is constructed and described by a set of multiphysical equations reflecting the flow field, transient electromagnetic field, electric circuit, and mechanical motion. The motion performance of the actuator and the pressure drag caused by the high-speed movement of metal plate are analyzed under different opening speeds. It shows that the pressure drag has a strong buffer effect on the actuator. The influence of the laminar and standard k À e models on the pressure distribution, velocity distribution, and motion characteristics is focused on. In comparison with the laminar model, the pressure drag of the turbulence model is much higher than the laminar model and is more beneficial for the buffer design of the mechanism.

Effects of Fast Elongation on Switching Arcs Characteristics in Fast Air Switches

“…Because of the difficulties in the simulation of a fast elongating arc (FEA) in subsonic regimes, there is only a limited number of relevant papers in the literature. Some other researches were conducted on electrical simulations for modeling the drive, studying the effect of different parameters on u c [14][15][16], and application of this drive for AC circuit breakers [17], in combination with vacuum CBs [18,19] or HVDC interrupters [4,10,20]. The latter has resulted in a patent registered by ABB [21].…”