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高压电器  2015 

紫外成像法的GIS盆式绝缘子局部放电研究

DOI: 10.13296/j.1001-1609.hva.2015.09.006, PP. 34-38

Keywords: 气体绝缘组合电器,局部放电,光子数,紫外成像

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Abstract:

气体绝缘组合电器(gasinsulatedswitchgear,GIS)在电力系统中占有重要地位,盆式绝缘子是GIS内部重要的部件,其表面放电是影响GIS安全运行的重要因素,文中在盆式绝缘子表面设置了典型的绝缘缺陷模型,利用紫外成像仪记录了其表面放电引起紫外光子发射的整个过程,分析了典型放电缺陷模型下的放电电压与光子数之间的关系,对绝缘子表面放电进行了探索,取得的结论????表面放电紫外光子数随着缺陷尺寸的增大有增大趋势,但是多次重复性实验表明存在饱和特性;????当模拟的同一种绝缘缺陷位于盆式绝缘子不同位置的时候,放电初始电压不同,相同电压下的光子数目也存在较大差异;????当绝缘缺陷距离导杆距离大于6cm时,在相同电压下的放电明显减弱,产生的紫外光子数也明显减少。这些结论有助于后续对盆式绝缘子表面电荷特性的深入研究,同时也为现场检测GIS局部放电提供了依据。

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