中文摘要：

以某型号万能式断路器的主触头系统为研究对象，采用导电桥模型模拟触头间的微观接触，建立电动稳定性和热稳定性的计算模型，对触头电动斥力以及触头温升进行了定量分析。在此基础上，校核断路器短时耐受电流能力。在电动稳定性计算中，考虑涡流的影响，采用三维电磁瞬态分析，对触头电动斥力进行了定量的分析。在热稳定性计算中，利用改进的导电桥模型获得了瞬态温度场的仿真结果。根据已建立的模型分别考虑了移动转轴孔的位置和增大触头终压力2种方案对短时耐爱能力的影响一并给出了具体的优化方案．

英文摘要：

The main contact system of an ACB（Air Circuit Breaker） is modeled for calculating its electro- dynamic stability and thermal stability,which applies the contact bridge model to describe the microcosmic contacting between movable and fixed contacts,the electric repulsion force and temperature rise of contacts are quantitatively analyzed and its short-time withstand current is evaluated. In electro-dynamic stability calcu- lation,3D transient electromagnetic analysis is used to quantitatively calculate the effect of eddy current on the electric repulsion force. In thermal stability calculation,the improved contact bridge model is applied to obtain the simulative results of transient thermal field. Two schemes,i.e, shifting shaft hole position and increasing contact ending pressure,are introduced and their effect on short-time withstand current is researched based on the established model. An optimal scheme is given.