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三种绝缘气体下开关设备的温度场及流场对比与分析

, PP. 155-161

Keywords: 温度场,气流场,开关设备,SF6,N2,空气

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Abstract:

基于热传导微分方程、流体运动控制方程及辐射换热方程,建立了开关设备的传导、对流和辐射换热相互耦合的数学模型,并采用壁函数法处理对流换热边界条件。利用棱边单元法计算了考虑集肤效应、邻近效应及涡流效应下载流导体和外壳的焦耳热损耗。以某型号开关设备为对象,采用有限容积法和六面体网格,分别计算分析SF6、N2、空气中开关设备的三维温度场与气流场,从温升角度探讨空气、N2作为SF6替代气体的可行性。计算结果表明,三种气体中温度分布基本相同,温升大小表现为SF6气体内的最高,N2内与空气内的差别不大;三种气体中的气流速度大小顺序也表现为相似的规律。从温升角度考虑,在满足绝缘条件的前提下,空气、氮气具有替代SF6的可行性。

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