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短路电流对自能膨胀式高压SF6断路器电弧开断过程中阀运动特性的影响

DOI: 10.13336/j.1003-6520.hve.2015.09.048, PP. 3164-3170

Keywords: 断路器,磁流体动力学,温度,气压,单向阀,烧蚀

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Abstract:

单向阀的运动特性对自能膨胀式高压SF6断路器的仿真计算结果准确度具有直接影响。为此,提出了一种耦合了阀片运动的自能膨胀式高压SF6断路器磁流体动力学模型,对2种典型开断条件下(短路电流有效值为36kA和40kA,燃弧时间15.3ms)的燃弧情况进行了研究;对比分析了不同电流下灭弧室内的温度分布、气压分布、喷口烧蚀质量以及单向阀的运动特性。结果表明,40kA条件下灭弧室内的整体温度和气压高于36kA条件下;40kA条件下的单向阀比36kA条件下的单向阀提前0.8ms动作,喷口烧蚀质量增加了0.35g。

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