摘要
利用多导体传输线原理，建立大型汽轮发电机定子绕组的脉冲传播模型，模型参数是基于似稳电磁场的有限元数值计算方法，根据电容、电感、电导、阻抗、传播速度间的关系求得。文中详细描述了单根线棒、单相绕组及考虑相间耦合的绕组仿真模型。并将仿真计算结果与200MW汽轮发电机实验结果进行了比较，证实了模型的可靠性。
On the basis of multi-conductor tredssion line tbo, a new model for pulse propaation in turbine generator stator windings is develed. The parameter matrices C, L, R, G in the model are calculated by using static-steady electromagnetic fiele theory and using the relationship between the parameters and the pulse propagation velocity, which is tested on a single bar laid down in a slot of turbine generator stator. Finite element method is chosen to solve the fiele problem. The experiment results tested on real 200MW turbine generator stator windings agree with the simulation results derived from the model.In the paper two different descriptions are presented, one complex for multi-strand bar and the other simplified for a single solid conductor. The study on the response of the bar to a steepfronted pulse indicates that the multi-strand bar can be simplified into a single solid conductor. Then the driension of parameter matrices is not unreasonably large. Considering the Considering the single baras a basic conductor, medels for singlesphase band winings and three-phase windings are respectively comleted. In the threephase moedel, the coupling among different phase windings is taken into account, which will influence the partial discharge signal detection in the on-line monitoring of turbine generators.It is found that the fast mode in propagation of pulse mainly depends on the coupling among bars.
出处
《中国电机工程学报》
EI
CSCD
北大核心
1999年第8期7-11,24,共6页
Proceedings of the CSEE
基金
国家自然科学基金!59637200
关键词
汽轮发电机
定子绕组
脉冲传播模型
大型
multi-conductor transmission line
turbine generator
pulse propagation
partial discharge
