High voltage circuit breakers are important equipment in power systems, and the valve motion of the chambers plays a role in the arc extinguishing performance of high-voltage circuit breakers. Therefore, in this paper, a 145 kV auto-expansion SF6 circuit breaker is taken as the research object, and a two-dimensional axisymmetric magnetohydrodynamic arc model considering valve motion process is established. The influence of different short circuit breaking conditions on the valve motion was studied. The results show that the backflow phenomenon of ablated steam is the main reason for the closure of the non-return valve, which plays an important role in opening the pressure relief valve. The closing time of the non-return valve is about 0.4 ms faster at a short circuit current of 40 kA than at a short circuit current of 36 kA.

中文翻译：

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考虑阀门运动的自膨胀式高压SF6断路器开断过程仿真


高压断路器是电力系统中的重要设备，室阀运动对高压断路器的灭弧性能起着重要作用。因此，本文以145 kV自胀式SF6断路器为研究对象，建立了考虑阀门运动过程的二维轴对称磁流体动力圆弧模型。研究了不同短路开断条件对阀门运动的影响。结果表明，烧蚀蒸汽的回流现象是止回阀关闭的主要原因，对泄压阀的开启起着重要作用。 40 kA 短路电流时止回阀的关闭时间比 36 kA 短路电流时快约 0.4 ms。