换流变压器端部极性反转电场的数值算法及其绝缘设计  

Numerical Computation of Polarity Reversal Electric Field in the Converter Transformer Ending and Its Insulation Design

作　　者：吕晓德[1] 陈世坤[1] 方治强 孙定华 

机构地区：[1]西安交通大学 [2]西安变压器厂

出　　处：《西安交通大学学报》1997年第11期8-12,共5页Journal of Xi'an Jiaotong University

摘　　要：极性反转是换流变压器运行中一种特殊的工作状态，此时绕组承受交、直流耦合电场的作用，其中直流电场为非线性、各向异性场．首先分析了极性反转的物理过程及该电场的数值算法；然后针对直流电场的各向异性，应用Ｇａｌｅｒｋｉｎ法建立了该电场的有限元模型，并应用以上工作计算了４种典型的换流变压器绕组端部绝缘中极性反转电场的分布．通过对计算结果的分析，得出了一些具有实用意义的结论．Polarity reversal is a special phenomenon occurring during operation of a converter transformer. The windings are stressed by combined action of AC and DC electric fields, with the latter being a nonlinear, anisotropic one. The transient process of polarity reversal is analyzed first and then a numerical method of computing its electric fields is presented. Considering the anisotropic property of oil immersed pressboard, a new finite element model based on Galerkins method is presented and verified. The method and model developed are applied to calculation of the electric field distribution in four typical winding end structures of the converter transformer. The results are analyzed and some conclusions of practical significance are obtained.

关 键 词：极性反转 换流变压器 数值计算 绝缘设计 

分 类 号：TM422.2[电气工程—电器]