抽蓄机组工况转换频繁,转子疲劳强度计算是设计时需重点关注的问题.本文以敦化抽蓄电站转子磁极为例,采用FKM局部应力法对磁极高点应力位置进行疲劳强度评估,疲劳载荷主要考虑正常启停机工况和甩负荷工况磁极所承受的脉动循环载荷,结构应力通过有限元方法得到,计算过程包含FKM标准中疲劳计算的大部分内容,疲劳强度结果通过利用度给出.本文可以为疲劳强度计算提供一些参考.

300Mvar空冷隐极调相机转子跨距长、重量大,在自身重力作用下转子挠度和弯曲应力已经达到疲劳设计极限,因此设计出安全可靠的转子结构具有很大难度.本文建立了300Mvar空冷隐极调相机转子疲劳损耗的三维有限元分析模型,分别对机组额定稳态运行工况及起停机过程的瞬态工况进行仿真计算,分析两种工况下转子的动态应力,并进一步对起停机工况的动态应力进行雨流法分析.最后,根据德国机械工程师委员会的FKM疲劳计算导则,对调相机转子进行寿命评估,保证了300Mvar空冷隐极调相机转子的安全可靠性.

针对动平衡转子故障诊断问题,提出基于SOA架构的发电机组转子动平衡诊断新方法.该方法采用基于SOA架构的模块化设计,JAVA(编程语言)语言开发.按照单面动平衡方法,对测取的基本振动数据进行动平衡计算与分析,设计了动平衡诊断功能模块,通过模块进行动平衡计算,实现输入数据的动平衡判断,使发电机组振动试验的完成更加规范化、便捷化和准确化.

根据某电厂600MW汽轮发电机组在大修时发现转子一端护环有损伤,更换新护环时发现库存的备用护环锻件的屈服强度有所降低的情况,通过对该机型的转子护环进行有限元应力分析计算,论证了备用护环锻件可以满足机组的运行要求,解决了用户实际需求.

To solve the stator transport obstruction problem, HEC made some more improvements on existing 600MW generator design to avoid the stator transport beyond limit. The research includes the load bearing structure, the transportation boundary condition, the generator ventilation design and the structural design. Finite element analysis method is adopted to calculate and analyze the working conditions and the transportation process of the generator. According to practice, it can verified that the design of generator can meet the expected requirements and reliable operation, and stator transport process limits safety distance can meet the requirements, and structural safety factor meets the relevant requirements. The design of the stator core radial multi-channel ventilation structure is taken to cover the structure of the air supply and return air channel, which can meet the requirements of the air volume distribution in the stator wind area.

汽轮发电机转子护环是用来保护和固定端部的转子绕组,在转子线圈两端外侧,则依靠与护环配合的中心环来遏止其在轴向的移动.当汽轮发电机转子在高速旋转时,护环-中心环的支撑结构避免了转子绕组的径向移动,同时也承受着强大离心力和热膨胀力,所以对发电机设计来说,护环和中心环的分析十分重要.文中以哈尔滨电机厂全新开发的空冷系列机组中的185 MW 60 Hz汽轮发电机为例,针对转子护环及中心环的应力进行有限元分析计算,供汽轮发电机设计人员参考.

The characteristic of pumped-storage machine is frequent start and shut-down. The designed start and shut-down frequency is 10 cycles/day according with the general specification. There will be a great impact loading applied on the pole connecting structure both generator and motor conditions transform. The pole winding thermal expansion will also be additional influence on the pole connecting structure. Therefore, The pole connecting structure should not only guarantee the static safety factor, but also ensure the f adequate fatigue life for the start and shut-down condition, rejection condition and runaway condition. In this paper, several kinds of the pole connecting structure had been compared and analysis.

抽水蓄能机组的定、转子气隙计算准确性会影响机组运行的稳定性和各项参数,本文利用有限元方法建立了定、转子的模型,合理地对其边界条件进行了模拟和计算,并根据机组的安装流程来计算出准确的气隙安装值,以此来保证机组运行时的气隙值达到设计值.

电力系统运行表明,大多数故障是输电线路上发生的瞬时性短路故障,尤以单相接地短路故障居多,约占70％以上.为了提高电力系统的安全稳定运行能力,国内外普遍采用重合闸操作,其成功率高达60％～90％.重合闸操作会引起连续的电气暂态过程,给系统中各种设备如发电机、电动机等造成冲击,进而在其相应部件上产生疲劳损耗.疲劳损耗的累积超过相应部件的寿命,就会造成电机不同程度的疲劳损坏.因此,掌握事故工况下发电电动机的疲劳损耗影响对机组安全可靠影响有着非常重要的意义.

文章以有限元仿真分析技术为基础对某在建的300MW等级抽水蓄能发电电动机转子支架机械刚强度、疲劳寿命以及轴系临界转等机械性能进行了综合研究，为抽水蓄能机组转子的机械可靠性设计提供了理论校核依据。