超导电炭黑复合半导电屏蔽材料对直流电缆绝缘材料空间电荷注入的影响

Influence of Super-conductive Carbon Black Composited Semi-conductive Shielding Material on Space Charge Injection of DC Cable Insulating Material

将超导电炭黑和普通炭黑分别填充到乙烯-丙烯酸乙酯中(EEA)中,制备了电阻率相同的半导电屏蔽材料,测试其力学性能、体积电阻率以及空间电荷性能,分析超导电炭黑复合半导电屏蔽材料对直流电缆绝缘材料空间电荷注入的影响,并与国外±500 k V直流电缆半导电屏蔽材料的性能进行对比。结果表明:高结构的超导电炭黑聚集体直径较小、表观密度小,在添加量较少时,其在EEA中分布较常规导电炭黑密集,粒子间距小,所得半导电屏蔽材料作为电极时,直流绝缘材料中空间电荷注入量较小。

Semi-conductive shielding materials with the same volume resistivity were prepared by adding super-conductive carbon and common carbon into ethylene-ethyl acrylate（EEA）, respectively, and their mechanical properties, volume resistivity, and space charge performance were tested. The effects of super-conductive carbon black composited semi-conductive shielding material on the space charge injection of DC cable insulating material were analyzed, and their properties were compared with that of the foreign semi-conductive shielding material for ± 500 k V HVDC cable. The results show that the diameter and the apparent density of high structure superconductive carbon aggregate are small. When the addition amount of super-conductive carbon is small, its distribution in the EEA is denser than that of the conventional conductive carbon black, and the interparticle spacing is small. When the obtained semi-conductive shielding material is used as electrode, the space charge injection amount in DC insulating material is smaller.