彭水电站3号机组发电机定子机座水平振动严重超标问题分析

对彭水电站3号机组进行了定子机座振动试验,分析总结了不同转速、不同励磁、不同负荷下定子机座的振动特性,以及定转子空气间隙对定子机座振动的影响,并通过数据对比分析了定子机座振动的原因,为彭水电站水轮发电机组经济、安全、稳定运行提供了依据,也为斜立筋柔性结构的定子机座的设计和施工提供参考。

混流式水轮发电机组定子机座水平振动超标分析与处理

定子机座水平振动对发电机的损害主要表现在经长期高强度振动使铁心、线棒等部件加剧磨损,降低使用寿命;结构件受交变应力影响,造成定子机座刚强度下降,甚至出现疲劳断裂;严重时定转子形变,发生旋转、固定部件碰撞,造成发电机组损坏等。彭水水电公司机组自投产发电开始定子机座水平振动超出国标要求,本文主要介绍分析了造成定子机座水平振动超标的原因,并通过对机组转子圆度、定子铁心拉紧螺杆松动进行处理后,定子机座水平振动大幅度下降,达到国家标准中B区运行要求,大大提高了设备的可靠性,保证了机组安全稳定运行。

STUDY ON VIBRATION REDUCTION BEHAVIOR FOR THE HYDRAULIC ENGINE MOUNT

In this paper,the metal hydraulic engine mount (HEM) with the orifice is presented,the construction of HEM is consist of hydraulic cylinder and the spring on the bottom,its mechanical model is given and dynamics equations are set up with considering kinematics conditions and continuous of fluid,the dynamics behavior of HEM including dynamic stiffness of fluid and transferability of HEM are studied here.The example of hydraulic engine mount is calculated,it is shown that the vibration reduction performance of the hydraulic engine mount of this paper is better.The analysis method of vibration reduction behavior for HEM in this paper can be used in designing of the reduction vibration devices and the HEM in this paper can be used in the practical engineering for reduction vibration.

大型汽轮发电机定子改造中隔振结构的优化设计

大型汽轮发电机的定子隔振结构设计对于减少铁心和机座的振动至关重要。在对某700 MW级水氢冷发电机的定子进行改造时,采用切向立式隔振结构替代原卧式隔振结构。应用Ansys有限元仿真软件对改造后的机座振动和弹簧板强度进行分析。结果表明,优化后的隔振结构能满足改造后定子的振动及强度要求,并使隔振性能有所提升。