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氧化铝填充环氧绝缘子SF6气体中直流负极性闪络特性

DOI: 10.13334/j.0258-8013.pcsee.2014.36.019, PP. 6523-6529

Keywords: 环氧树脂,填充成分,闪络电压,时间常数,几何结构,电树枝,分形维数

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Abstract:

直流气体绝缘金属封闭输电线路(gasinsulatedtransmissionline,GIL)在一些特殊环境下可替代部分架空输电线路或电缆提高输电走廊选择的灵活性。影响直流GIL中绝缘子水平的关键因素有氧化铝填料比例、自由导电微粒等。该文对SF6气体中,负极性直流电压下不同氧化铝含量(250~400phr)的环氧绝缘子在准均匀场和极不均匀场下的沿面绝缘特性和烧蚀特性进行了研究。结果表明,准均匀场情况下,填料含量250phr的绝缘子在短时闪络特性和长时耐压特性方面都具有最好的沿面电气强度,同时在极不均匀场中也具有最好的沿面电气性能。而填料含量为350phr的绝缘子则具有最差的直流耐压特性以及耐烧蚀特性。通过对闪络微观图像的分析,可知闪络过程发生在绝缘子的浅表面。同时,通过分析电树枝发展图像的分形维数,发现了填料含量对环氧绝缘子闪络烧蚀特性以及直流电压下的绝缘子电树枝发展特性的影响。

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