Analysis for interruption characteristics of circuit breaker is important for improving its efficiency. This article takes high voltage SF6 circuit breaker with spring operating mechanism as the research objectives

according to concrete structure model studied

mathematic model of pressure characteristic and thermodynamic model of arc effect are found in this paper. The co-simulation models of the spring operating mechanism and interrupter are build by Adams and MATLAB

and the interruption characteristics of circuit breaker are calculated. The simulation curve of moving contact displacement can reflect the experimental curve well

which can verify to the simulation accuracy. Then on this basis

the change with time of moving contact displacement

interrupter gas pressure

and buffer force are analyzed. This modeling and simulation method not only quickly calculate and evaluate the interruption characteristics of SF6 circuit breaker with spring operating mechanism

but also provide the force conditions of component. This method is helpful for confirming structure parameters of interrupter and spring operating mechanism. Meanwhile it may provide a basis for the conversion of design method of SF6 circuit breaker from experience to simulation.