同轴电极下非线性绝缘介质阶跃响应仿真分析

为了验证非线性绝缘材料在非均匀电极结构下均化电场分布的内在机理,以典型非均匀电极结构(同轴电极)下填充电导率为非线性的绝缘介质所构成的绝缘结构为研究对象,采用有限元软件ElecNet仿真分析了不同幅值阶跃电压作用下非线性绝缘介质中瞬态响应的空间分布,得到的非线性绝缘介质内部空间电荷的分布揭露了非线性绝缘介质能自行均化电场的根本原因是空间电荷效应。稳态电场的计算结果表明:阶跃电压幅值越高,绝缘介质非线性程度越高,电场改善的程度越好。

Simulation of Response Characteristics of Non-linear Insulating Dielectrics in Coaxial Electrodes Under the Step Voltage

To validate the internal mechanism of non-linear insulation dielectrics on the functions of grading the electric field in the non-uniform electrodes structure,the typical non-uniform electrodes structure(coaxial electrodes structure)filled non-linear conductivity dielectrics was taken as research object.The finite element method(FEM)software ElecNet was adopted to simulate transient responses of non-linear insulating materials.ElecNet is one kind of software for modeling,non-linear simulation and 2D transient analysis.The response values of electric field,conduction current density and electric displacement vector,are exported from the solved models.The space charge response values are got by computing,and spatial distributions of transient responses of non-linear dielectric material are plotted in the software Matlab.According to the space charge distribution,positive space charge accumulation is found in the non-linear insulation dielectrics.So the electric field near the internal electrode is reduced and the electric field near the exterior electrode is enhanced.The space charge distribution indicates that space charge effect improves the electric field distribution in complex insulation structure.Finally,the steady electric field data show that the more the amplitude of voltage and the nonlinearity of insulating dielectrics is,the better the degree of electric field improvement is.