中文摘要：

寻找替代SF6的气体绝缘介质一直是国内外学者研究的热点,氮气绝缘开关柜是一种性能较好的环保型气体开关柜。针对氮气绝缘开关设备大电流工况散热问题开展研究,对气体绝缘开关柜的发热及散热机理进行分析,测试得到样机在3 150 A电流下的试验温升值,通过优化开关柜内部元件的结构、增大有效散热面积系数,在气箱内形成更有效气流循环通道降低开关柜温升。试验结果表明断路器动端、三工位隔离开关触管、三工位隔离开关动触头的温升测试值分别降低了7 K、6 K和5 K。开发的12 k V/3 150 A氮气绝缘开关柜满足温升标准,确保了开关柜运行的可靠性。

英文摘要：

The replacement of SF6 gas insulation media is a hot topic, and nitrogen insulated switchgear is a environmentally friendly gas switchgear with better performance. In this paper, heat dissipation problem of gas insulated switchgear in high current environmental was analyzed, and heat generation principle and heat dissipation mechanism of gas insulated switchgear were analyzed. The experimental temperature rise of sample was obtained under the current of 3 150 A. By optimizing structure of internal components of switchgear and increasing the effective heat dissipation area coefficient, a more effective air circulation channel was formed to reduce the switchboard temperature rise in the air box. The test results showed that temperature rise test values of the circuit breaker moving side, the contact tube and the movable contact of three-position isolating switch were reduced by 7K, 6K and 5K respectively. The developed 12 kV/ 3 150 A nitrogen insulated switchgear meets the temperature rise standard and ensures the reliability of switchgear operation.