水轮发电机励磁绕组匝间短路转子热应力计算与分析  

Calculation and Analysis of Rotor Thermal Stress for Inter-turn Short Circuit of Hydro generator Excitation Winding

作　　者：李俊卿[1] 王罗 李永刚[1] 沈超 LI Junqing;WANG Luo;LI Yonggang;SHEN Chao(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071000,China;State Grid Hebei Maintenance Branch,Shijiazhuang 050000,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071000 [2]国网河北省电力公司检修分公司,河北石家庄050000

出　　处：《电机与控制应用》2018年第8期116-123,共8页Electric machines & control application

基　　金：河北省自然科学基金项目(E2014502015)

摘　　要：以三峡700 MW水轮发电机为例,基于传热学和热应力理论,建立转子磁极三维求解模型,并给出相关的基本假设与边界条件,最后采用有限元方法对热应力进行求解,得到在转子绕组匝间短路情况下的磁极热应力分布。在此计算的基础上,进一步研究了短路匝数变化与匝间短路位置变化对磁极热应力的影响。通过计算研究得出了很多有意义的结论,为匝间短路更深层次的研究奠定了基础,也为电机设计者以及相关研究工作提供一定的参考。The Three Gorges 700 MW hydro-generator was used as an example to establish a model of rotor magnetic pole.The thermal stress was solved by finite element method based on the theory of heat transfer and heat stress.Based on the relative basic assumptions and boundary conditions,the distribution of magnetic heat stress in case of winding inter-turn short-circuit was given.On the basis of this calculation,the influence of the change of short-circuit turns and the change of short-circuit position on the magnetic heat stress was studied.Many meaningful conclusions have been obtained through computational research.The results lay the foundation for further study of the inter-turn short-circuit,and provide some reference for the motor designers and related research work.

关 键 词：水轮发电机 励磁绕组 匝间短路 有限元 热应力 

分 类 号：TM307[电气工程—电机]