【摘 要】
：
近年来,低SF6混合比的SF6/N2混合气体开始作为绝缘介质在气体绝缘金属封闭输电线路(Gas-insulated Metal-enclosed Transmission Line,GIL)中得到逐步应用,以替代纯SF6气体.为了在电力设备中更好地应用SF6/N2混合气体,本文在工频电压下,通过实验分析研究了不同电场均匀度下较低SF6混合比的SF6/N2混合气体的击穿特性,并在极不均匀场下研究了局
【机 构】
：
西安交通大学电气工程学院,西安710049 中国电力科学研究院,北京100192
【出 处】
：
中国电机工程学会高电压专业委员会2015年学术年会
论文部分内容阅读
近年来,低SF6混合比的SF6/N2混合气体开始作为绝缘介质在气体绝缘金属封闭输电线路(Gas-insulated Metal-enclosed Transmission Line,GIL)中得到逐步应用,以替代纯SF6气体.为了在电力设备中更好地应用SF6/N2混合气体,本文在工频电压下,通过实验分析研究了不同电场均匀度下较低SF6混合比的SF6/N2混合气体的击穿特性,并在极不均匀场下研究了局放起始电压的变化规律.研究发现,稍不均匀场及稍不均匀场向极不均匀场过渡区域,SF6/N2混合气体的击穿电压随气压增加基本呈线性升高趋势,电场不均匀度进一步增加后,击穿电压出现了一定的饱和趋势.当电场不均匀度增大到一定程度后,间隙击穿前出现了稳定的电晕放电,但当气压超过一定值后,一旦起晕则立即击穿.由于空间电荷的作用,混合气体与纯SF6气体的击穿电压出现了“驼峰”现象,且随着电场不均匀度的增加,“驼峰”的范围与幅值变大.
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