快速真空开关合闸触头弹跳暂态过程研究OA北大核心CSTPCD

The fast vacuum switch with electromagnetic repulsion actuator as the operating mechanism has such ad-vantages as high opening speed,short opening and closing time and low dispersion of opening and closing time,and at present has been widely used in a variety of power equipment.At present,there are many studies on the opening process of fast vacuum switch,but the problems associated with the closing process are less.In this paper,the con-tact bounce of the fast vacuum switch in the closing process is studied.A multi-physical coupling simulation model is set up to describe the closing process of the fast vacuum switch completely.The relationship between v1 and Dmax of the fast vacuum switch is obtained,where v1 is the instantaneous velocity of the first contact between the moving and fixed contacts in the closing process,and Dmax is the maximum bouncing distance of the moving contacts.Ac-cording to this relationship,the critical instantaneous closing velocity vcri in the case of no closing bounce is deter-mined.According to the limitation of vcri,a kind of new oil buffer is designed to adjust the closing travel curve of the fast vacuum switch and achieve the non-bouncing closing.A fast vacuum switch equipped with the new oil buffer is developed,and a special measured platform is constructed to test its closing characteristics.The measured result shows that the error between the measured results and the simulation results is no more than 10%and the non con-tact bounce closing operation is achieved.