Abstract：Impurities affect the electric field and space charge distribution in cross-linked polyethylene (XLPE) cables, and play an important role in aging and breakdown of cable insulation. Therefore, it is very important to study the influence of impurities on electric field and space charge distribution in cable. In this paper, the potential distribution of each node is calculated by the finite element method of the second-order tetrahedral element meshing. Then the electric field strength of each node is calculated by deriving the negative gradient of the potential of each node, and the charge density of each node is obtained by calculating the divergence of the electric displacement vector. Taking a XLPE cable model with impurity particles as an example, the calculation results show that, under the effect of the electric field, the impurity particles will dissociate and cause the charge concentration around them. The charge amount accumulated on the surface of the impurity particles increases with the increase of the radius of the particles, and the charge density decreases with the increase of the radius. The closer the impurity particle is to the side of the high voltage, the greater the charges accumulated on the surface of the impurity particles. The charge density value around the impurity particles is not related to the relative permittivity, but it is closely related to the resistivity.
李亚莎, 代亚平, 花旭, 刘志鹏, 王成江. 杂质对交联聚乙烯电缆内部电场和空间电荷分布影响[J]. 电工技术学报, 2018, 33(18): 4365-4371.
Li Yasha, Dai Yaping, Hua Xu, Liu Zhipeng, Wang Chengjiang. The Influence of Impurities on Electric Field and Space Charge Distribution in XLPE Cable. Transactions of China Electrotechnical Society, 2018, 33(18): 4365-4371.
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