摘要
为使高漏抗、多绕组电力机车主变压器的漏磁场计算更加准确,建立了高速电力机车主变压器油箱热-磁三维有限元计算模型及物理方程,采用边单元有限元法对主变压器的油箱损耗进行了计算,同时按照磁-热弱耦合方法,计算出采取屏蔽措施前后油箱稳态温度场的分布。经试验得到该台变压器损耗为31.245 kW,三维有限元计算值为30.478 kW;同时在采用屏蔽措施后,油箱壁左侧与右侧铜屏蔽最高温度均降低3℃,其温度场分布更加均匀,为电力机车主变压器的优化设计提供了参考。
To improve the calculating precision of leakage magnetic field of high leakage reactance and multiwinding main transformer of electric locomotive, the finite-element thermal-magnetic calculation model and physical equations of oil tank in main transformer of electric locomotive are founded in this paper. The loss of tank is calculated with 3D FEM based on edge element. The 3D thermal field of the tank before and after taking shielding measure is also analyzed with FEM and weak coupled magnetic-thermal field method. The measured value of the tank loss is 31. 245kW while the calculation result is 30. 478kW by 3D FEM. It is also found that the maximum temperature of copper shields in both left and right are all reduced by 3℃. Temperature in the space distributes more uniformly, local hot-spot can be avoided and loss can be decreased. The calculation can also give a set of useful parameters for the design of main transformer of electric locomotive.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2007年第1期96-99,103,共5页
Proceedings of the CSU-EPSA
关键词
电力机车主变压器
边单元
有限元法
杂散损耗
涡流损耗
耦合
屏蔽
electric locomotive main transformer ~ edge element
finite element method （FEM）
stray loss
eddy loss
coupled-field
shielding
