The Simulation On Contact Characteristics Of AC Contactor

AC contactor is a kind of widely used controlling electrical apparatus,mainly used to long-distance shut off and turn on circuit.Contact is the direct executing agency of AC contactor,Characteristics of contact will directly affect the performance of AC contactor,thereby affect the safe and reliable operation of electric control system.It is difficult to study the contact characteristics of AC contactor through experiment.Due to that reason,AC contactor's contact characteristics were studied through the finite element simulation way in this paper.Firstly,the mechanics analysis simulation mode were established.The stress,strain and deformation of contacts in different shapes were compared by the mechanics analysis through the finite element software.Secondly,the contact resistance of contacts in different shapes were calculated,the heat flow rate of contact were obtained.The thermal analysis simulation modes of contact terminal in different shapes,considering the convection,were established.It was obtained the temperature of contact system under different ambient temperature.It was compared the temperature rise of contact terminal in different shapes.Thirdly,it was obtained the thermal stress of contacts in different shapes under different ambient temperature using thermal-structure sequential coupling method.The effect of temperature rise on contact characteristics was analyzed.Finally,On the basis of crack propagation theory.Stress of coating surface of the composite contact under different coating thickness was analyzed.It was obtained the stress intensity factor under different AgNi10 coating thickness.The effect of AgNi10 coating thickness on crack propagation of composite contact was analyzed.