非线性复合材料对不均匀电场的改善效果仿真分析

Simulation Analyse of Modification Effect of Nonlinear Composites on Nonuniform Electrical Fields

为改善绝缘介质空间电场的分布,针对实际运行中高压试验所采用的针-板电极以及330 kV电力系统中复合绝缘子的不均匀电场,建立其仿真模型,分析探讨了非线性复合材料对不均匀电场的改善效果及其内在作用机制。在直流和交流电压作用下,采用非线性复合材料局部替换高电场强度区域的绝缘材料,则其轴向电场强度最大值与平均值之比分别从9.06和5.22降为1.03和1.77。仿真分析结果表明,非线性复合材料可以有效改善绝缘介质空间电场分布;采用局部替换的方法可以使得绝缘材料的介质损耗和泄漏电流相对较小。

In order to improve the electrical field distribution of insulating medium, we proposed a simulation model of the nonuniform electrical fields of needle-plate electrodes widely used in high voltage experiments and composite insula- tors applied in the 330 kV power systems, and discussed effect of improving electric field distribution by using nonlinear composites and its mechanism. Our calculation result indicates that, by partially replacing the insulation material in an area of extremely high electrical field intensity with nonlinear composite, the ratios between the maximum value and the average value of the axial electrical field decreased from 9.06 and 5.22 to 1.03 and 1.77 under DC voltage and AC vol- tages, respectively. It is concluded that using nonlinear composites can effectively improve the electrical field distribution of insulating medium, and partially replacement with nonlinear composite can further keep the lower dielectric loss and leakage current.