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直流应力下电极表面覆膜对金属微粒启举的影响机理研究

, PP. 119-127

Keywords: 直流GIL,电极表面覆膜,金属微粒启举,充电时间常数,间歇性启举,重启举时长

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Abstract:

针对直流GIL中的自由金属微粒污染物问题,研究表面覆膜措施对金属微粒启举的限制机理。利用气体电离及界面电荷积聚理论提出了直流应力下电极覆膜时金属微粒带电及启举模型,并根据微粒带电量的时变特征提出了充电时间的概念。为验证模型的正确性,构建了多功能模块的金属微粒带电-运动观测实验平台,对不同大小、材质的球形金属微粒以及不同厚度的PET薄膜开展实验,实验结果验证了模型的正确性直流应力下,覆膜措施产生的界面极化过程只是增加了微粒的充电时间,而对微粒最终带电量并无影响,但覆膜产生的静电吸附力可显著提高微粒的启举电压;外施电压、覆膜介电常数及体电导率对微粒充电时间均有显著影响;而由于充电时间的存在使得电极覆膜措施下出现微粒“间歇启举”现象。

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