Calculation and Analysis of Electromagnetic Field and Temperature Field Under Broken Strands for a Large Synchronous Generator
Yin Qiaoyu1, Li Weili1, Yu Haitao2, Sun Hongli3
1. Harbin University of Science and Technology Harbin 150080 China 2. CSR Zhuzhou Electric Machinery Company Limited Zhuzhou 412001 China 3. State-Owned Beijing Shuguang Motor Factory Beijing 100028 China
Abstract:Taking a 150MW air-cooled turbine-generator as an example, the two-dimensional electromagnetic field analysis model is established. By using finite element method (FEM), the electromagnetic field and parameters of the generator operating under rated load with broken strands in windings are analyzed, by which the distribution laws of magnetic density in air-gap, stator slots and tooth bottom are studied. Then the variation of direct and quadrature axis synchronous reactance in generators with and without broken strands are comparatively researched. Based on some reasonable assumptions, three-dimensional temperature field calculation model of stator within tooth-space is established. From the electromagnetic analysis, heat sources distributions in generators with different broken strands are obtained, and stator three-dimensional temperature field are calculated. The change tendencies of temperature distribution in the stator without and with different broken strands are analyzed and the influence of broken strands on the maximum value of temperature and its appeared location are analyzed. From the studies some conclusions are obtained, which could provide some theory reference for some issues such as safe operation of generator with broken strands.
殷巧玉, 李伟力, 于海涛, 孙宏丽. 大型同步发电机断股故障情况下电磁场和温度场的计算与分析[J]. 电工技术学报, 2011, 26(2): 59-67.
Yin Qiaoyu, Li Weili, Yu Haitao, Sun Hongli. Calculation and Analysis of Electromagnetic Field and Temperature Field Under Broken Strands for a Large Synchronous Generator. Transactions of China Electrotechnical Society, 2011, 26(2): 59-67.