摘要
基于电荷–电位有限元法分析换流变压器的油纸绝缘结构极性反转电场,该方法可以直接得到节点电位和节点电荷。对各个时刻节点电荷进行处理,提出得到电荷密度的方法。通过提取一类边界上的节点面电荷密度,可以准确地计算出第一类边界上的法向电场强度,从而可以更好地指导绝缘强度设计。通过一个有解析解的双层有损同轴绝缘结构模型,验证了方法的有效性。最后,分析了一个换流变压器阀侧绕组典型绝缘结构的极性反转电场变化过程。
The polarity reversal （PR） electric field of oil-paper insulation structure was computed by the charge- electric potential finite element method, in which the node charges and electric potentials can be directly obtained. The node charges at every instant could be converted to node charge densities by a numerical method proposed. The normal electric field intensity can be accurately got from the electric charge density of the Dirichlet boundary, which may be helpful to the insulation design. The proposed method was verified by a simple model, which has analytical solutions, and used to analyze the PR process of a typical oil-paper insulation structure of converter transformer.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第25期132-138,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(50977030)
国家电网公司科技项目(SGKJJSKF[2009])~~
关键词
有限元
边电荷密度
法向电场强度
油纸绝缘
换流变压器
极性反转
finite element
boundary charge density
normal electric field intensity
oil-paper insulation
converter transformer
polarity reversal
