中文摘要：

为了优化高压SF6断路器设计,以550 k V高压SF6断路器为研究对象,建立1维可压缩气流场物理数学模型,基于有限体积法求解冷气流开断下气流场,得到激波处的变量值和时间序列图。在对断路器灭弧室与机构进行联合仿真研究中,考虑了激波处混沌现象对断路器开断能力的影响,假定机构4种不同分闸加速度方案即a、0.8a、0.6a、0.4a（a为基准加速度）,计算分闸特性曲线和冷气流开断下断路器介质恢复特性。结果表明：改变分闸加速度后,行程150、190 mm激波处压力、密度值较高,220 mm激波处的马赫数较高;分闸加速度在0.8a条件下,介质恢复特性的平均值要高于实验数据,开断性能较好。

英文摘要：

In order to optimize the design of an SF6 circuit breaker （CB）, taking the 550 kV high voltage SF6 circuit breaker （CB） as the investigation subject, we deduced a 1D mathematical model for compressive gas flow field. The dis- tribution of Mach number in the gas flow field under cold gas flow breaking was calculated using finite volume method （FVM） to achieve the value of various parameters and the time series under different opening stokes. In the study of joint simulation for hydraulic actuator and arc quenching chamber, the interruption performance and dielectric recovery property under cold gas flow breaking were calculated by considering the effects of chaotic characteristics at shock wave on the breaking performance and setting four interruption acceleration of hydraulic actuator （a, 0.8a, 0.6a and 0.4a）. The re- suits show that, after adjusting the interruption acceleration, the pressure, density at the region of 150, 190 mm shock wave and Ma at the region of 220 mm shock wave possess higher values, respectively. When the interruption acceleration is 0.8a, the calculated average of dielectric recovery property is higher than experimental data, and SF6 CB exhibits better interruption performance.