直流电场下聚合物空间电荷分布的极性效应  

Polarity Effect on Space Charge Distributions in Polymer Under DC Electric Field

作　　者：钟小燕[1] 郑跃胜[1] 党斌[2] 缪希仁[1] 何金良[2] ZHONG Xiaoyan ZHENG Yuesheng DANG Bin MIAO Xiren HE Jinliang(College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, Fujian Province, China Department of Electrical Engineering, Tsinghua University, Haidian District, Beijing 100084, China)

机构地区：[1]福州大学电气工程与自动化学院,福建省福州市350108 [2]清华大学电机工程与应用电子技术系,北京市海淀区100084

出　　处：《中国电机工程学报》2016年第24期6693-6701,共9页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2014CB 239505)~~

摘　　要：挤压型高压电缆用聚合物材料在直流电场作用下,空间电荷的分布具有极性效应。为了揭示引起极性效应的物理机制,该文引入双极电荷传输模型,考虑了双极性电荷的复合、俘获、脱陷等传输过程以及电极表面电荷的注入。通过参数化分析,辨别影响阴极和阳极空间电荷与电场非对称分布的主要物理参数。然后利用该模型仿真了均匀直流电场下聚丙烯空间电荷和电场分布,并与实验结果进行了比较。结果表明:聚丙烯空间电荷的非对称分布主要由迁移率和脱阱势垒决定,聚丙烯电场的非对称分布主要由迁移率和注入势垒决定,可为聚合物材料的调控提供理论依据。Polarity effect on space charge distributions can be found within high voltage extruded polymeric cables under DC electric fields. In order to reveal the physical mechanism of the polarity effect, a numerical model considering bipolar charge transport with recombination, trapping and detrapping in polymeric material as well as charge injection on electrode surfaces was introduced. The main physical parameters affecting the .asymmetry space charge and electric field distributions at cathode and anode were distinguished by parametric analysis. Then the model was applied to analyze the space charge and electric field distributions in polypropylene （PP） under an uniform DC electric field and compared with the measured data. It is shown that the mobility and the detrapping barrier height lead to the asymmetrical distribution of space charge in PP, while the mobility and the injection barrier height lead to the asymmetrical distribution of electric field in PP. The results can provide a reference for the regulation and control of polymeric materials.

关 键 词：直流电场 高压直流电缆 空间电荷 双极电荷传输 聚丙烯 电场 数值仿真 

分 类 号：TM247[一般工业技术—材料科学与工程]