大型汽轮发电机定子端部绕组动态特性研究

本文用锤击法对某大型汽轮发电机定子端部绕组进行了模态研究。建立起端部绕组部件和整体结构模型，定量确定出影响汽轮发电机定子端部模态固有频率的关键因素，提出改进方案，以确保端部动力特性、满足设计要求。     

1000MW汽轮发电机定子铁心的模态分析

汽轮发电机定子铁心的固有频率必须避开发电机的工频和倍频。本文参考东方汽轮机厂1000MW汽轮发电机的定子铁心结构,在ANSYS平台建立了定子铁心的有限元模型,并计算了定子铁心的固有频率与振型,接着对定子铁心的定位槽逐步施加约束,计算出相应的固有频率与振型。为大型汽轮发电机的设计、制造提供重要的依据。     

HEC 600 MW汽轮发电机定子模态及振动试验研究

介绍了哈电制造的600MW汽轮发电机定子模态及振动性能试验研究。给出了定子的椭圆固有频率，定子铁心、机座、轴承座的振动幅值及定子机座的隔振系数，可供600MW汽轮发电机运行及大型汽轮发电机组的设计和制造参考。     

300MW汽轮发电机槽楔松动检测方法

300MW汽轮发电机定子槽楔发生松动,会导致定子线棒在电磁力作用下产生电磁振动,加剧定子线棒绝缘的机械磨损及槽内放电引起的绝缘腐蚀,直接威胁着发电机的安全运行。通过对300MW汽轮发电机槽楔松动过程进行分析研究,获取槽楔受迫振动条件下的位移特性来综合判断槽楔松动程度,并对槽楔位移测量值进行分析,能够准确地判断槽楔的松动情况。在电厂现场实测中验证了该检测方法对300MW汽轮发电机槽楔松动检测的准确性。     

东方-日立型600MW汽轮发电机定子装配工艺

本文介绍了东方-日立型600MW 汽轮发电机定子装配的试制过程,阐述了600MW 汽轮发电机定子装配的有关工艺。     

发电机端部固有频率的模态分析

通过两例300MW不同机型汽轮发电机的端部固有频率测试及模态参数识别分析，说明发电机端部固有频率测试及模态参数识别是检查发电机端部结构情况的重要手段，并介绍了这两种发电机端部结构模态参数的特点。     

1000MW级核能发电机定子机座及铁心固有频率三维有限元分析

本文对我公司生产的1000MW级核能发电机定子机座、铁心的固有频率、模态振型进行了三维有限元动力特性计算分析。这对于了解核电发电机定子系统的动力特性,开发大型汽轮发电机,以及设计制造、安全运行等都具有重要意义。     

330 MW汽轮发电机定子端部绕组固有频率测量

借助仪器，对法国ALSTOM公司生产的330MW汽轮发电机定子端部绕组固有频率进行测量。定性分析端部绕组的振动状态，并对测量结果进行分析。     

发电机端部固有频率的模态分析

通过两例300MW不同机型汽轮发电机的端部固有频率测试及模态参数识别分析,说明发电机端部固有频率测试及模态参数识别是检查发电机端部结构情况的重要手段,并介绍了这两种发电机端部结构模态参数的特点.     

大型汽轮发电机定子端部复合材料大锥环的设计与制造

介绍了大型汽轮发电机定子端部复合材料大锥环对发电机端部绕组起着可靠固定与减振等多重作用。以1000MW汽轮发电机的端部结构为例,运用Pro/E和ADAMS建立了定端复合材料大锥环加工缠绕设备的虚拟样机模型并应用ANSYS软件建立了定端玻璃纤维增强环氧树脂基大锥环的等效简化模型,计算出相应的固有频率与振型,为大型汽轮发电机定子端部复合材料大锥环的设计与制造提供参考。     

国产引进型300MW汽轮发电机转子轴颈划伤现场修复工艺

汽轮发电机转子轴颈划伤问题是火力发电厂在检修中遇到的普遍问题,国产引进型300MW火电机组汽轮发电机转子轴颈划伤现场修复工艺,提高了现场修复施工质量,保证了主设备的安全。     

国产化300MW/600MW汽轮发电机失磁后异步运行能力的研究

对哈尔滨电机厂生产的ＱＦＳＮ－３００－２和ＱＦＳＮ－６００－２型汽轮发电机失磁后稳态异步运行情况下的定子端部发热、转子损耗及定子过电流等问题进行了研究,从而预估了３００ＭＷ／６００ＭＷ汽轮发电机失磁后的异步运行能力     

燃气轮发电机组继电保护配置

针对燃气轮发电机组与燃煤机组的主要电气差异,分析了用于燃煤机组的常规保护原理在燃气轮发电机变频启动过程中的有效性,探讨了燃气轮发电机启动工况下的发电机启动过流、发电机定子接地、主变差动、发电机低频及定子低电压等特殊保护配置,比较了燃气轮发电机组与燃煤机组在并网模式下的保护配置差异,并提出300MW及以上燃气轮发电机组的典型继电保护配置方案。     

100MW联合循环汽轮机制造技术

文章以东方汽轮机厂100MW联合循环汽轮机国产化为背景，从焊接技术、静子部件加工技术、转子加工技术、总装技术几方面介绍了100MW联合循环汽轮机的国产化制造技术。     

基于空载误强励灭磁对发电机过电压保护整定的研究

为研究发电机过电压保护设定值在空载误强励灭磁过程中对发电机本体和灭磁系统安全性的影响,分别对采用自并励励磁的300 MW和600 MW汽轮发电机组在不同发电机过电压保护设定值下进行空载误强励灭磁仿真。对比仿真结果可见,过电压保护设定值较低时相应的发电机最高定子电压、灭磁电流、灭磁电阻能耗和灭磁时间也较小,有利于发电机本体和灭磁系统的安全。为论证降低过电压保护定值的可行性,分析说明了该定值降低后并不影响励磁系统V/Hz限制、发电机过激磁保护和发电机正常运行。基于以上结论,提出了减小发电机过电压保护整定值和增设发电机空载专用过电压保护的建议。     

空冷水轮发电机定子线棒制造工艺研究

以真机试验线棒的制造为基础,重点对1000MW的超大容量空冷水轮发电机线圈直线胶化工艺、成型焊接工艺、导线压制工艺、模压工艺、绝缘结构应用等方面进行研究。研究结果完善了薄绝缘、大高宽比模压定子线棒生产工艺,为今后空冷1000MW水轮发电机定子线棒正式投产奠定了坚实基础。     

Application of ultrasonic pulse-echo method to insulation condition diagnosis for large generators

It is a challenge to diagnose insulation condition of stator bars using an ultrasonic technique, due to the complex structures of the stator bars and the high attenuation of the stator insulation. In this paper, five low frequency transducers were used in a pulse-echo configuration to try to test a standby stator bar of a generator (300 MW, 18 kV). With an available transducer, four types of insulation structures were tested on the stator bar. The short side insulation was compared with the large one of the stator bar in the slot. The stator bar near the exit from the slot and the end stator bar, were compared with the stator bar in the slot. The semiconductive coating covered stator insulation was compared with the uncoated one. The stator insulation having an insulation-copper interface was compared with that having an insulation-gas interface. In addition, insulation diagnosis tests in the laboratory were performed on two sets of stator bars, which had been in service for 18 and 23 years, respectively in two generators (300 MW, 18 kV). Field tests were performed on the stator bars near the exit from the slot and the end stator bars of a generator (300 MW, 18 kV). The experimental results demonstrated an availability of low frequency ultrasonic pulse-echo method for insulation condition diagnosis of large generators     

The degradation assessment of epoxy/mica insulation under multi-stresses aging

The actual stator bars of 18 kV/300 MW generator were used for accelerated multi-stress aging tests to investigate the degradation of epoxy mica insulation. The stator insulation of large generator was a composition system of epoxy resin, mica and glass fiber. Ultra-wide band PD detecting technique was introduced to measure the PD pulse of the specimens during aging. The data obtained were analyzed using joint time-frequency analysis methods and finally Gabor spectrum was selected to analyze the characteristics of single impulse wave in different aging period. The results of analysis indicate that following increasing aging time, the high-frequency component of single impulse wave continuously increased, while the energy of discharge alternated from low-frequency long time lag to high-frequency short time lag and high-frequency long time lag. Scanning electronic microscope was used to observe the pattern of interface during the aging process, which show that changes in interface is the main reason of aging. The variation of components in insulation was also analyzed by the technique of infrared spectrum and X-ray energy spectrum and the results indicate that epoxy resin creates hydrolytic reaction and the mica undergoes structural change.     

东汽第8代300MW汽轮机设计技术特点

东方汽轮机厂第8代300MW汽轮机在消化吸收国外先进技术的基础上,采用当代先进的通流技术和结构设计技术,通过理论分析和试验研究,解决了原机组存在的问题,提高了机组的经济性、可靠性和安全性.文章详细介绍了东汽第8代300MW汽轮机的设计技术特点.表3     

470MW燃气轮机发电机定子线棒绝缘技术的研究

本文介绍了470MW燃气轮发电机定子线棒绝缘技术及定子线棒的电气性能.通过对定子线棒绝缘结构、防晕结构的优化设计和材料的改进,使定子线棒绝缘性能、防电晕效果得到了较大的提高,尤其是定子线棒优异的电性能,保证了470MW燃气轮发电机定子绕组的运行寿命.