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电网技术  2011 

±500kV气体绝缘金属封闭输电线路绝缘尺寸设计

, PP. 192-196

Keywords: 雷电冲击耐受电压,内屏蔽电极,外屏蔽电极,自由导电微粒,表面电荷积聚,气体绝缘金属封闭输电线路

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Abstract:

随着高压输变电设备如气体绝缘金属封闭输电线路(gasinsulatedtransmissionline,GIL)的大规模应用,内部支撑绝缘子的介电强度成为设备安全稳定运行的重要因素。限制GIL在直流输电中应用的2个重要因素分别是绝缘子表面电荷积聚和自由导电微粒的影响。在考虑这2种影响因素的情况下,借助有限元分析软件,设计±500kV直流GIL的绝缘尺寸,包括GIL的内外径,内、外屏蔽电极和屏蔽坑,含氧化铝的环氧树脂盆式绝缘子的结构设计。此外,还提出直流GIL盆式绝缘子外形结构设计的3项原则,设计中考虑了表面电荷积聚和金属微粒对GIL绝缘水平的影响因素。设计结果达到预期目标,绝缘子和电极系统的等位线分布比较均匀,但是其耐电性能还有待实验的进一步检验。

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