For the mechanical vacuum circuit breaker, the particle composition group of the metal vapor arc varies with different operating conditions, which will lead to the discontinuous variation of the electrical conductivity between electrodes. The change of mixed metal vapor arc macroscopic electrical characteristics results from the space-time change of microscopic arc plasma characteristics. For the vacuum circuit breaker, the interruption performance is directly influenced by the composition of the metal vapor arc plasma and the characteristic parameters. For evaluating the electrode characteristics and establishing a database of mixed metal vapor arc characteristic parameters for the vacuum interrupter, this paper presents a study of the copper chromium (CuCr) alloy contacts used in vacuum circuit breakers. The Eindhoven model was used to derive a Local Thermodynamic Equilibrium (LTE) vacuum arc plasma particle composition model. The thermodynamic parameter variation of metal vapor arc plasma is calculated by statistical thermodynamic method, and the electrical conductivity was calculated by Chapman-Enskog method. The mass density, enthalpy, specific heat and electrical conductivity for different alloy proportion (CuCr25, CuCr40, CuCr50, CuCr60 and CuCr75) were compared and quantitatively characterized.

中文翻译：

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真空断路器混合金属蒸气微弧等离子体特性分析


对于机械真空断路器来说，金属蒸气电弧的颗粒组成族群随运行条件的不同而变化，这将导致电极间电导率的不连续变化。混合金属蒸气电弧宏观电特性的变化是由微观电弧等离子体特性时空变化引起的。对于真空断路器来说，其开断性能直接受金属蒸气电弧等离子体的成分和特性参数的影响。为了评估真空灭弧室的电极特性并建立混合金属蒸汽电弧特性参数数据库，本文对真空断路器用铜铬（CuCr）合金触头进行了研究。 Eindhoven 模型用于推导局部热力学平衡 (LTE) 真空电弧等离子体粒子组成模型。采用统计热力学方法计算了金属蒸气电弧等离子体的热力学参数变化，并采用Chapman-Enskog方法计算了电导率。对不同合金比例（CuCr25、CuCr40、CuCr50、CuCr60和CuCr75）的质量密度、热函、比热和电导率进行了比较和定量表征。