Effects of the preparation of semi-conducting electrode on space charge injection in LLDPE
Effects of the preparation of semi-conducting electrode on space charge injection in LLDPE
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DOI：
10.1109/ichve49031.2020.9280031
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发表时间：
2020-09
期刊：
影响因子：
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通讯作者：
Bohong Xu;F. Zheng;Yewen Zhang;Z. An
中科院分区：
文献类型：
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作者：
Bohong Xu;F. Zheng;Yewen Zhang;Z. An
聚乙烯被广泛应用于高压直流电缆中，但长时间暴露于高压电场中会导致绝缘层中空间电荷积累，从而导致电场畸变甚至击穿电缆。在半导电层中加入炭黑（CB），对减小电场、防止绝缘损伤有重要作用。本文将粒径为18 nm、30 nm和55 nm的炭黑纳米粒子分别以30wt%和35wt%均匀分散在乙烯-醋酸乙烯酯共聚物（伊娃）中。在40 kV/mm、40°C条件下，研究了半导体电极制备对线性低密度聚乙烯（LLDPE）空间电荷注入的影响。结果表明，当半导体电极中炭黑的质量分数较低时，空间电荷注入率较低。电极填充有较大尺寸CB颗粒和填充率的样品也显示出较低的空间电荷注入率。讨论了半导体电极中交联剂对空间电荷注入的影响。
Polyethylene is widely used in high-voltage DC cables, but prolonged exposure to high-voltage electric field will result in space charge accumulation in insulation layers, which could lead to electric field distortion or even breakdown of cables. The addition of carbon black (CB) in semi-conducting layer plays an important role in homogenizing electric field and preventing insulation damage. In this paper, CB nanoparticles of 18nm, 30nm and 55nm were uniformly dispersed into ethylene-vinyl acetate copolymer (EVA) with 30wt% and 35wt% respectively. The effects of the preparation of semi-conducting electrodes on space charge injection in LLDPE were studied under 40 kV/mm and 40°C. The obtained results show that space charge injecting rate is low when the mass percentage of CB in the semi-conducting electrode is low. The sample with the electrode filling with bigger size CB particles and filling rates also shows low space charge injecting rate. The impact of crosslink agent within the semi-conducting electrodes on the injection of space charge is also discussed.