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考虑非弹性随机碰撞与SF6/N2混合气体影响的直流GIL球形金属微粒运动行为研究

DOI: 10.13334/j.0258-8013.pcsee.2015.15.028, PP. 3971-3978

Keywords: 直流气体绝缘金属封闭输电线路(GIL),金属微粒,非弹性随机碰撞,SF6/N2混合气体,谐振频率,微粒活跃度

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Abstract:

针对直流气体绝缘金属封闭输电线路(gasinsulatedmetalenclosedtransmissionline,GIL)金属微粒污染物问题,研究球形金属微粒在其中的运动行为,采用贴合实际情境的同轴圆柱电极结构,建立直流GIL内球形金属微粒运动模型:纳入SF6/N2混合气体动力学参数,利用流体力学理论分析微粒运动过程中混合气体阻力的影响;同时考虑金属表面粗糙度影响,利用弹性力学中的碰撞理论分析金属微粒与导体及外壳的非弹性随机碰撞,实验结果验证了模型计算的可靠性。利用模型对微粒运动轨迹进行仿真分析,并根据微粒运动的分布情况提出微粒活跃度的概念,研究表明:微粒在导体与外壳间的谐振频率与微粒半径、SF6占比、绝缘气压呈负相关;微粒活跃度与随机反射角、电压幅值呈正相关,而随着微粒半径变化存在极大值。

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