电极旋转情况下真空电弧阳极熔蚀过程的数值仿真与分析*

Numerical Simulation and Analysis of the Anodic Etching Process of Vacuum Arc under the Condition of Electrode Rotation

  • 摘要: 对真空灭弧室中阳极触头的三维几何模型进行建模与分析,为了讨论电极旋转对真空电弧及阳极热过程的影响,建立了数学模型来模拟阳极表面熔化、蒸发时的相变过程,采用多孔介质描述方法以便于对固-液混合区域进行处理。由热过程的数值模拟可知,旋转电极表面温度、熔池面积以及熔池深度与热过程的时间呈正相关;电极转速越快,则阳极表面最高温度以及阳极表面熔池面积越小,阳极表面温度分布更加均匀,以此仿真模型为评估断路器的开断容量提供理论依据。

     

    Abstract: A three-dimensional geometric model of anode contact of vacuum circuit breaker is established and analyzed in this paper. To analyze the influence of electrode rotation on vacuum arc and anode thermal process, a physical model of phase transformation process is established for the melting and evaporation of anode surface. The solid-liquid mixing area is treated by the description method of porous media, and the numerical simulation of anode thermal process is carried out, concluding that with the increase of time, the anode surface temperature is increasing, molten pool is developing, molten pool depth is deepening, in addition, with the increase of electrode speed, the highest temperature on the surface of the contact and the size of the molten pool are reducing, and the temperature distribution is more uniform. This simulation model can be an academic foundation to research the breaking capacity of circuit breaker.

     

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