考虑合金蒸发的真空电弧铜铬阳极热过程仿真

发布时间：2018-11-09 15:05

【摘要】：真空灭弧室阳极热过程对真空断路器的开断能力有重要影响。以往的理论分析多以纯金属为研究对象,未考虑合金对阳极蒸发过程的影响。为研究真空电弧铜铬合金阳极热过程,并研究合金蒸发的影响,在已有的纯铜阳极热过程模型的基础上,提出了针对铜铬合金触头的熔化-凝固过程和蒸发过程的计算方法。研究结果表明:弧后阳极温度衰减有2种模式,模式一是温度平滑下降的模式,对应于小电流扩散态电弧,模式二中温度下降过程有一"水平段",对应于大电流聚集态真空电弧,该"水平段"持续时间与注入阳极热流的幅值正相关;针对不同铬含量的铜铬合金触头,弧后阳极热过程规律为,阳极温度CuCr50CuCr25Cu,阳极温度衰减速度CuCr50CuCr25Cu,电流过零时刻阳极蒸气压CrCuCr75CuCr50CuCr25Cu,在铬的质量分数为25%时完全熔化区的体积最小。
[Abstract]:The anodic thermal process of vacuum interrupter has an important effect on the breaking capacity of vacuum circuit breaker. The previous theoretical analysis mostly focused on pure metal without considering the effect of alloy on the evaporation process of anode. In order to study the anodic thermal process of Cu-Cr alloy in vacuum arc and the effect of alloy evaporation, based on the existing models of pure copper anode thermal process, a calculation method for melting solidification and evaporation process of Cu-Cr alloy contact is proposed. The results show that there are two modes of temperature attenuation in back-arc anode. Mode one is the mode of smooth decrease of temperature, which corresponds to the low current diffusion arc. In mode 2, there is a "horizontal section" in the process of temperature decline. The "horizontal" duration is positively correlated with the amplitude of the injected anode heat flux corresponding to the high current aggregated vacuum arc. For the copper-chromium alloy contacts with different chromium content, the law of anodic thermal process behind the arc is as follows: anodic temperature, CuCr50CuCr25Cu, anodic temperature attenuation rate, anodic vapor pressure (CrCuCr75CuCr50CuCr25Cu,) at zero crossing time of CuCr50CuCr25Cu, current and the minimum volume of the complete melting zone when the mass fraction of Cr is 25.
【作者单位】：西安交通大学电力设备电气绝缘国家重点实验室;
【基金】：高等学校博士学科点专项科研基金资助项目(20130201110005)
【分类号】：TM561.5

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