摘要
目的分析非线性、各向异性、交直流耦合电场的瞬态特性，对比不同绝缘结构的耐压强度．方法分析了极性反转的物理过程，针对直流电场的各向异性，应用Ｇａｌｅｒｋｉｎ法建立了该类电场的有限元算法模型，并基于以上工作计算了４种典型的换流变压器端部绝缘结构中极性反转电场的分布．结果全角环结构具有最佳的绝缘特性．结论合理选择绝缘构件。
Aim To analyze the transient speciality of nonlinear, anisotropic, AC+DC coupling electric field, and to compare the withstand voltage strength of different insulation structures. Methods The transient process of polarity reversal is analyzed, considering the anisotropic property of oil immersed press board, a new finite element model based on Galerkin method is presented and verified. The model developed is applied to calculate the electric field distribution in four typical winding end structures of the converter transformer. Results\ The whole ring structure possesses the best insulation characteristics. Conclusion\ By introducing reasonable insulation components, insulation strength with the same surrounding sizes can be improved more than 30%.
关键词
各向异性
有限元法
极性反转
绝缘
anisotropy
finite element method
polarity reversal
insulation
