用三维有限元方法研究影响框架断路器电动斥力的因素

RESEARCH ON FACTORS AFFECTING ELECTRO-DYNAMIC REPULSION FORCE IN AIR CIRCUIT BREAKER WITH THE METHOD OF 3-D FINITE ELEMENT

触头系统上电动斥力的计算对框架断路器(ACB)的设计有重要意义。为克服传统定性分析的缺点,提出一种定量分析的方法来研究影响框架断路器电动斥力的因素。该方法基于电流-磁场-电动斥力之间的方程,并考虑了铁磁物质的影响,应用三维有限元分析,首先研究了框架断路器通过恒定电流各动触头片电动斥力的大小及分布特点,然后分析了动触头并联支路数及转轴位置对电动斥力的影响,同时还研究了软联接对电动斥力的影响。计算结果可为ACB新触头系统的设计提供参考。

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.