【摘要】 大型水轮发电机定子铁心磁化试验时有时会出现呼吸振型的喘振和巨大噪声,刘家峡3号机在改造时发现存在类似风险。为此,本文以刘家峡3号机为例,采用有限元方法和解析法相结合的方式从振动原因、机理进行分析,提出有效的解决对策,避免磁化试验时因强烈振动而损坏定子结构件,并正确评价铁心的装配质量。刘家峡3号机磁化试验以及EL-CID检测结果表明了本文的分析方法正确、对策有效,避免了振动,正确地评价了铁心装配质量;机组投运后一切正常也表明即使磁化试验中发生振动,但对电机正常运行没有影响。这些研究及结论将对水轮发电机磁化试验和运行具有重要意义。更多还原

【Abstract】 In the magnetization test of stator core of large hydro-generator, the breathing mode surge and huge noise may occur from time to time. Similar risks were found in the refurbishment of Liujiaxia 3# hydro-generator. For this reason, taking Liujiaxia 3# hydro-generator as an example in this paper, the causes and mechanisms of vibration are analyzed through the combination of FEM and analytical method, and the corresponding countermeasures are put forward to avoid the damage of stator structure due to strong vibration during magnetization test, and the assembly quality of iron core is correctly evaluated. Results of the magnetization test and EL-CID test in Liujiaxia 3# hydro-generator show that the analysis method is correct, the countermeasure is effective, and the vibration is avoided, the core assembly quality is evaluated correctly. The normal operation of the unit also indicates that even if the vibration occurs during the magnetization test, it has no effect on the normal operation of the hydro-generator. These studies will be of great significance to the magnetization test and operation of hydro-generator.更多还原