等效热路模型在高电压真空断路器额定通流温升仿真中的应用OA

Temperature rise of rated current,as an important parameter for assessing the status of vacuum circuit breaker,currently relies primarily on electromagnetic coupling simulation.However,this method requires consider-able time for modeling contact models with different structures and dimensions.In this paper a temperature rise esti-mation model for the rated current of vacuum interrupter based on a thermal circuit method is proposed.The ther-mal circuit model,compared with the traditional electromagnetic coupling simulation model,can quickly reflect the temperature rise of high-voltage vacuum circuit breaker,which is conducive to the design of current-carrying struc-tures for high-voltage vacuum circuit breaker.A thermal circuit model consisting of heat flow and thermal resistance is constructed for the current-carrying structure of the vacuum interrupter.The thermal circuit models for 2/3 turn coil contacts are set up,and the components in the thermal circuit are parameterized based on the physical parame-ters of the contact structure.The temperature rise values of the key nodes of the vacuum interrupter contact are ob-tained by simulation.Both accuracy and efficiency of the thermal circuit model are verified by comparison with the electromagnetic coupling simulation results of the vacuum interrupter.