摘要
针对大型水轮发电机不对称运行时阻尼条易熔断的现象,在建立电机二维电磁场电路运动耦合时步有限元模型的基础上,对一台1 000 MW水轮发电机不对称运行时阻尼条涡流损耗进行深入研究.全面考虑了定子开槽、磁极转动以及定子电流等因素对阻尼条涡流损耗的影响,准确计算出不同运行工况下一个磁极内各根阻尼条涡流损耗,分析其变化规律,并在此基础上讨论了阻尼系统连接方式、阻尼条半径、阻尼条材料对阻尼条涡流损耗的影响.研究结果表明,不对称运行时,沿旋转方向最后一根阻尼条涡流损耗最大,阻尼系统结构参数对阻尼条中涡流损耗分布有较大影响.
Aiming at the phenomenon that the damping bars would easily fuse under the asymmetrical operation of large hydro-generator, the eddy current loss of damping bars under the asymmetrical operation of a 1 000 MW hydro-generator was further studied on the basis of establishing two-dimensional electromagnetic field-circuit-motion coupled time-stepping finite element model. The influence of such factors as the stator slotting, magnetic pole rotation and stator current on the eddy Current loss of damping bars were comprehensively considered. The eddy current loss of each damping bar in one magnetic pole under different operating conditions was accurately calculated, and the change rule of eddy current loss was analyzed. And thus, the influence of the connection mode of damping system as well as the radius and material of damping bar on the eddy current loss of damPing bars was discussed. The results indicate that the eddy current loss of last damping bar along the rotation direction is the largest, and the structure parameters of damping system have greater influence on the distribution of eddy current loss of damping bars.
出处
《沈阳工业大学学报》
EI
CAS
北大核心
2012年第2期138-143,共6页
Journal of Shenyang University of Technology
基金
"十一五"国家科技支撑计划重大资助项目(2007BAA05B06)
关键词
1000MW水轮发电机
不对称运行
阻尼条
涡流损耗
数值计算
阻尼方式
阻尼条半径
阻尼条材料
1 000 MW hydro-generator
asymmetrical operation
damping bar
eddy current loss
numerical calculation
damping mode
damping bar radius
damping bar material
作者简介
梁艳萍（1963-），女，黑龙江哈尔滨人，教授，博士生导师，主要从事电机电磁理论与电磁设计，电磁场分析与计算等方面的研究．
