摘要
针对套管尾部均压球表面电场分布不均匀、容易发生电晕及绝缘介质击穿的问题,应用三维有限元法,对特高压交流套管的电位电场分布进行了仿真计算,得出套管尾部均压球表面的电场分布不均匀,上、下段弧面的场强较高,中间区域的场强较低.分析了均压球的结构参数对其表面电场分布的影响,并以此确定了均压球结构优化的目标函数.在此基础上,利用神经网络拟合了均压球结构参数与优化目标之间的关系,得到了均压球结构参数的最优解.通过对特高压交流变压器套管尾部均压球结构优化,均压球表面最大电场强度降低了20%,均压球表面电场分布更加均匀,提高了套管尾部闪络电压,且结构简单、易于生产.
For the uneven electrical distribution on screening electrode of ultra-high voltage AC bushing,hence often leading to corona and dielectric puncture,the electric field and voltage distribution of ultra-high voltage AC bushing are evaluated with 3D FEM.It is found that the field strength on the upper and lower arcs of the screening electrode gets higher,but on the intermediate region gets lower.By changing the structure parameters of screening electrode,the influences of shape of the electrode on electric field distribution are analyzed,and the optimization objective function is established accordingly.The neural network model is constructed to map the structure parameters of screening electrode on the optimal goal.As a result,the maximum electric field strength decreases by 20%,electric field distribution becomes more uniform,and the flashover voltage of busing is heightened.The structure of the optimized screening electrode is simple and easy to be produced.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2012年第2期88-92,共5页
Journal of Xi'an Jiaotong University
基金
"十一五"国家科技支撑计划重大资助项目(2006BAA02A15)
关键词
特高压
均压球
电场分布
神经网络
优化
ultra-high voltage
screening electrode
electric field distribution
neural network
optimization
