中国电机工程学报2016，Vol.36Issue(24)：6635-6646,12.DOI:10.13334/j.0258-8013.pcsee.161821
双层a+bE非线性电导介质界面极化特性的理论研究
A Theoretical Study on the Interface Polarization Properties of Nonlinear Double-layered DielectricsWith a+bE Nonlinear Conductance
摘要
Abstract
Nonlinear dielectrics as the electric stress control materials has been widely applied in the high voltage insulation. Theoretical proving the interface polarization characteristics of double-layered nonlinear dielectrics and the difference form the interface polarization of linear dielectric have the important theoretical significance for rational design of double-layered insulation on engineering application. In this paper, based on the nonlinear dielectrics with a+bE type nonlinear conductivity, the differential equation about interface polarization of double-layered nonlinear dielectrics was established according to the law of circuit voltage and the principle of current continuity. The dynamic processes of the electric fields of dielectrics, the interface charge density and the polarization currents had been deduced analytically. The results show that: the electric field of each layer dielectrics and the interface charge have three kinds of relaxation model, which are the exponential model, the hyperbolic tangent model and the hyperbolic cotangent model. For the exponential model, the dynamic characteristics of the polarization can be described with a relaxation time constant governed by the material properties, the structure parameters and the amplitude of applied voltage. For the hyperbolic tangent model and the hyperbolic cotangent model, the two time factors determined by the three parameters above are used to describe the dynamic characteristics of the polarization, can be defined as the relaxation time and the initial time separately. The total current density in polarization including two absorption currents with different relaxation times and the DC steady state current, has a variety of relaxation forms.关键词
非线性介质/界面极化/动态场强/极化电流/界面电荷Key words
nonlinear conductance/interface polarization/dynamic electric field/polarization currents/interface charge分类
信息技术与安全科学引用本文复制引用
李忠华,索长友,郑欢..双层a+bE非线性电导介质界面极化特性的理论研究[J].中国电机工程学报,2016,36(24):6635-6646,12.基金项目
国家重点基础研究发展计划项目(973项目)(2014CB 239504)；国家自然科学基金项目(51177029)。 The National Basic Research Program of China (973 Program)(2014CB239504) （973项目）
Project Supported by National Natural Science Foundation of China (51177029) （51177029）
