中文摘要：

针对特高压直流转换开关MRTB,基于磁流体动力学理论建立了MRTB开断的燃弧过程数学模型。从电弧的物理过程出发,耦合了外部电路与机械运动对电弧的影响,实现了对MRTB灭弧室内电弧自激振荡的动态过程仿真计算。获得了开断中,SF6电弧温度压力等分布的内部动态过程以及电弧电压与振荡电流随时间变化的曲线,并进行了实验验证。研究工作可以应用于分析转换开关自激振荡中的电弧物理过程、研究不同电路参数的影响、优化断路器的灭弧室设计等方面,为特高压直流转换开关MRTB的研制与优化奠定了理论基础。

英文摘要：

This paper focuses on the ultra-high voltage DC（UHVDC） switch MRTB, arc model coupled with circuit and mechanism motion in MRTB is built based on magneto-hydrodynamics（MHD）theory, and the arc self-excitation process in arc chamber is calculated with the model. The temperature, pressure distribution, the oscillation current and are voltage curve are shown in simulation results, and the calculation results are verified by experiments. The model represented in this paper can be used for the self-excitation process analysis in MRTB, the influence of circuit parameters on arc process, and for the arc chamber optimization in circuit breaker and so on, and lay a theoretical foundation for the research and development of UHVDC switch MRTB.