1000MW空冷水轮发电机端部结构件涡流损耗优化探讨

Study on the Optimization of Eddy Current Losses of End Structures for 1000 MW Air-cooled Hydro-Generator

发电机定子端部附加损耗引起的结构件局部过热问题,已成为危及发电机正常运行的重要因素。对1000MW空冷水轮发电机端部结构特点做了简要介绍,利用瞬态有限元法对端部结构涡流损耗进行仿真分析。在此基础上讨论了压指和压板材料选择、几何结构设计对降低端部涡流损耗的影响,并对压指倒角大小和开槽深度选择做了探讨。压指和压板方案的该优化可以改善端部冷却条件,有效降低空冷发电机端部运行时的端部温升。

The local overheating of structural parts caused by additional losses in the end of generator stator has become a important factor that endangers the normal operation of generator. The end structure characteristics of 1 000 MW air-cooled hydro-generator are briefly introduced,and the eddy current losses of end structure is simulated by transient finite element method. On this basis,the influences of material selection and geometry structure of end fingers and clamp on reducing eddy current losses are discussed,and the choices of end finger size and grooving depth are also discussed. The optimization of end fingers and clamp scheme can improve end cooling conditions and effectively reduce end temperature rise of air-cooled hydrogenerator.