中文摘要：

聚乙烯中的空间电荷包行为是空间电荷的一种特殊的输运行为.研究表明,空间电荷包行为由于受材料本身特性、外加电场大小以及环境温度等的影响,导致其产生过程及传输特性上存在较大差异,这些因素给空间电荷包行为产生机理研究带来了较大困难.通过对电荷的电极注入过程、载流子的体内迁移规律及空间电荷与体内陷阱的相互作用机制进行分析,探讨了不同外加电场及不同深度陷阱能级对电荷包行为造成的相关影响,在此基础上建立物理模型来描述电荷包的产生和迁移过程.模型中提出了在高于阈值电场时,载流子迁移速度与电场关系存在负微分迁移率的假设.基于此模型对空间包行为的模拟结果与实验结果取得较好的一致.

英文摘要：

Packet-like space charge behavior is a kind of special transport behavior of space charge in polyethylene. It has been demonstrated that many factors,such as the intensity of applied field,temperature and material have great influence on the formation and migration of space charge packets. This would cause much difficulty in understaning the general mechanism of the phenomenon. In this paper,on the basis of analysis of charge injection and migration,the interaction between the charge and charge trap and the influence of electric field on charge trap level,a model is proposed to simulate the packet-like space charge behavior. We suppose thar there exists a negative differential relationship for the charge velocity against the electric field when the electric ficld exceeds a threshold value. By considering the negative differential relationship,we simulated various kinds of packet-like charge behaviors and the results of numerical simulation show a good agreement with the experimental results issued by different research groups.