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In order to improve the high voltage SF6 circuit breaker breaking performance, the simulation scheme of multi-parameter optimization design of circuit breaker interrupter is proposed based on the orthogonal experiment method. Through numerical modeling and simulation of interrupter airflow field, the effects of three parameters such as of cylinder diameter, expansion chamber diameter and nozzle throat diameter on the breaking performance of circuit breakers were studied. An interrupter structure with the best breaking performance was obtained. Simulation results show that, among the above three parameters, the nozzle throat diameter has the greatest influence on the breaking performance of circuit breakers. The smaller the nozzle throat diameter, the stronger the breaking performance of the circuit breaker. This is of great significance to the multi-parameter optimization design of high voltage SF6 circuit breaker interrupter structure. Introduction High voltage circuit breakers are important control and protection devices in power system. They can break, close and carry the normal, abnormal and short circuit currents of power system. Therefore, breaking performance is the most important technical indicators of high voltage circuit breaker [1,2]. During the breaking process of the high voltage SF6 circuit breaker, the arc generated between the moving contact and the static contact belongs to the plasma. The process of arc development is a complicated process of the interaction between electromagnetic field, temperature field and airflow field. The burning and extinguishing characteristics are closely related to the structure of the interrupter [3-5]. The nozzle and cylinder is the core components of the interrupter, and its shape has a significant impact on the gas pressure and flow rate during the arc extinguishing process. In order to study the influence of cylinder, expansion chamber and nozzle throat diameter on the breaking performance of circuit breakers and get the best interrupter structure through less simulation calculation, a high voltage SF6 circuit breaker is taken as the research object in this paper. Firstly, the simulation model of the flow field during the breaking process of interrupter is set up, and the parameters of flow field such as pressure, temperature and flow rate are obtained by numerical calculation. Secondly, based on the idea of orthogonal experiment method, a simulation program of multi-parameter optimization design for interrupter was designed. Thirdly, according to the simulation results, the influence of the above three parameters on breaking performance was analyzed, and an interrupter structure with the best breaking performance is proposed. Simulation Model and Characteristics of Airflow Field in Interrupter Mathematical Model of Airflow Field Simulation in Interrupter Based on the theoretical analysis and empirical design, the initial structure of the circuit breaker is put forward. In order to study the breaking performance of the circuit breaker, it is necessary to carry on the simulation of the load short circuit breaking process. Refer to the circuit breaker breaking test conditions, the interrupter breaking current loaded on the simulation model is rated short-circuit

Airflow Field Simulation and Structural Optimization of High Voltage SF6 Circuit Breaker Interrupter Based on Orthogonal Experiment