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高压电器  2015 

非平衡态双温度SF6等离子体电弧数学模型研究

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Keywords: SF6断路器,容性电流,双温度等离子体,电弧模型

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Abstract:

笔者针对SF6断路器小电流开断过程中温度梯度、各粒子密度梯度较大等现象,对非平衡态等离子体双温度电弧模型进行研究。分析电子与离子及中性粒子的碰撞频率与碰撞截面对电导率的贡献,得到SF6等离子体电导率随温度和压力变化关系,进而建立小电流条件下非平衡态双温度电弧模型。在已建立小电流非平衡态双温度电弧模型基础上,将研究结果应用于126kVSF6断路器开断容性小电流弧后介质恢复特性计算,得到计算结果与平衡态条件下相比是有差异的,此电弧模型的建立为非平衡态小电流数值计算提供了一种新的方法,研究结果对完善电器电弧理论具有重要意义。

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