Research on factors affecting electro-dynamic repulsion force in air circuit breaker with the method of 3-D finite element

For the optimization design of air circuit breaker (ACB), it is important and necessary to calculate the electro-dynamic repulsion force acting on the movable conductor. In order to overcome the disadvantages of the conventional qualitative analysis, a new method based on quantitative analysis is proposed to study the factors that affect electro-dynamic repulsion force in ACB. It's based on the equations among current-magnetic field-repulsion force and the ferromagnet is taken into account. With 3-d finite element nonlinear analysis, the magnitude and distributing characteristic of electro-dynamic repulsion force acted on every piece of movable conductors with constant current has been investigated. Then it gives an analysis of the factors that affect the electro-dynamic repulsion force, including the number of movable conductors, the location of the axis and the shape of the flexible connection. The results are capable of evaluating new design of contact systems in ACB.