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轴流式涡流喷口气流运动及高压SF6断路器介质恢复特性分析

DOI: 10.13336/j.1003-6520.hve.2015.06.023, PP. 1936-1942

Keywords: 能量分离,喷口,介质恢复特性,高压SF6断路器,涡流,开断

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Abstract:

为提高高压SF6断路器中介质恢复和开断能力,提出了涡流冷却气吹技术。在高压SF6断路器中构造新型轴流式涡流喷口结构,使气体在开断过程中动能径向交换,形成沿径向温度梯度,实现高压气流能量分离。以550kVSF6断路器为例,采用有限体积法,建立3维气流场物理数学模型,研究了容性小电流开断下,喷口上游构造的“X”形导流片对灭弧室内气流参数的影响。并基于流注理论,对有、无导流片结构的断路器介质恢复特性进行数值计算与定量分析。结果表明导流片结构改变流体运动形态,形成大旋转曲率强旋流动,有效实现能量分离,且能延长气流滞留时间,提高气流利用效率;新型轴流式喷口结构具有更高的介质强度恢复特性。

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