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用于抑制界面空间电荷的直流电缆附件设计

DOI: 10.13336/j.1003-6520.hve.2015.04.011, PP. 1140-1146

Keywords: 直流,交联聚乙烯绝缘,界面,空间电荷,应力锥,无界面电缆附件

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Abstract:

空间电荷积聚在电缆附件绝缘界面上会引起局部电场发生畸变,已成为直流电缆附件发展的主要制约因素。为此,提出了一种新的直流电缆附件设计理念,采用与电缆绝缘相似的交联聚乙烯材料模注在电缆绝缘层上制作成应力锥和附件的增强绝缘层,使得直流电缆附件的增强绝缘层与电缆绝缘层在交界面处融成一体,一定程度上消除了界面,进而从根本上改善了原界面上空间电荷的积聚情况。依据该设计理念研发的±200kV直流无界面电力电缆附件已经按照国际大电网会议CIGRETB496推荐的试验方法通过型式试验,验证了该设计理念的正确性。

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