Validation and Application of ANSYS-based Iterative Method for Vacuum Circuit Breaker Temperature Rise Simulation
The singular contact structure of vacuum circuit breakers necessitates more stringent design re-quirements,emphasizing the need for precise simulation to balance the contact resistance and its magnetic excita-tion characteristics.The pursuit of enhanced current-carrying capabilities and the trend towards miniaturization and compactness have exacerbated the heat generation within these devices,while simultaneously limiting their cooling efficiency.In the context of power transmission,the temperature rise in vacuum circuit breakers has be-come a pivotal factor constraining the enhancement of their current-carrying performance parameters.Simulation analysis of temperature rise is of paramount importance for product development.The temperature rise not only alters the resistivity of materials,thereby affecting the heat generation process,but also impacts the cooling process by modifying the surface heat transfer coefficient,necessitating continuous adjustments to material param-eters in response to temperature variations.This paper introduces an iterative coupling simulation approach based on ANSYS Maxwell and Fluent,leveraging engineering experience to establish an initial temperature rise value.This value is used to create a coupling relationship between the thermal and flow fields.By averaging the as-sumed initial temperature rise with the corresponding simulation results and using this average as the initial value for subsequent calculations,the process is iterated until the simulation results fall within a predefined error range of the initial value,yielding a steady-state temperature rise simulation outcome.The proposed method is applied to guide the design of a vacuum circuit breaker prototype,which is subjected to a temperature rise test at a cur-rent of 4000A.The experimental results indicate that the temperature rise values at various points of the circuit breaker,as determined by the iterative coupling method,are in close agreement with the test outcomes,with the maximum discrepancy being within 9％.This validates the accuracy of the method and the finite element model employed.
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