核电汽轮发电机定子壳体振动故障分析与治理研究  

Faults analysis and treatment for vibration in stator housing of nuclear power turbo-generator

作　　者：胡启龙 张恒[1] 张卫军[1] HU Qilong;ZHANG Heng;ZHANG Weijun(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054

出　　处：《热力发电》2024年第7期82-90,共9页Thermal Power Generation

基　　金：国家科技重大专项(2018ZX06906011-007-002)。

摘　　要：对不同激振力作用下核电汽轮发电机定子壳体振动机理和特征开展研究,提出汽轮发电机定子壳体振动故障的分析和治理方法,并结合3台核电机组的工程实例进行分析验证。研究结果表明:定子壳体固有频率接近旋转频率或倍频电磁共振频率引起的结构共振是导致定子壳体振动超标的主要原因;转子激振力引起的定子壳体结构共振,可从减小激振力和调整定子壳体固有频率两方面进行治理,进行现场动平衡可有效降低转子激振力,调整定子壳体固有频率可通过定子底脚载荷分配调整实现;由于磁拉力大小调整范围有限,磁拉力引起的定子壳体结构共振应通过调整定子壳体固有频率进行治理。在发电机安装或检修时,应通过定子底脚载荷分配调整,使定子壳体固有频率避开旋转频率和倍频电磁共振频率,避免发电机定子壳体结构共振的发生。The vibration mechanism and characteristics of stator housing in nuclear power turbo-generators under different excitation forces are investigated,and an analysis and treatment method for the stator housing vibration fault is proposed.Moreover,analysis and verification is conducted by using three nuclear power turbo-generator units as examples.The results show that,the main cause of excessive stator housing vibration is the structure resonance resulting from the natural frequency of the stator housing being close to the rotating frequency or its double.The structure resonance caused by rotor excitation force can be controlled in two ways:by reducing the excitation force through field dynamic balance,or by adjusting the natural frequency of the stator housing through adjustment of the stator bottom bracing load distribution.Performing on-site dynamic balancing can effectively reduce the rotor excitation force.Adjusting the natural frequency of the stator housing can be realized through load distribution adjustment of the stator feet.However,due to the limited adjustment range of the magnetic pulling force,it is necessary to control the structure resonance caused by magnetic pulling force by adjusting the natural frequency of the stator housing.To prevent structure resonance of the stator housing,it is important to adjust the stator bottom bracing load distribution during installation or maintenance of the turbo-generators to keep the natural frequency of the stator housing away from the rotating frequency and electromagnetic force frequency.

关 键 词：核电汽轮发电机 定子壳体振动 结构共振 现场动平衡 定子底脚载荷调整 

分 类 号：TM311[电气工程—电机] TM623