汽轮发电机定子绕组端部动态特性诊断

概述了发电机定子绕组端部振动的产生原因、危害、检测方法和现有的技术标准,总结了动态特性诊断的关键因素和振动问题的现场处置方法,针对端部振动问题给出了运行与维护中的一些建议.

基于气隙探测线圈与端部振动的百万机组转子匝间短路分析

针对某大型汽轮发电机运行中定子振动偏高的问题,介绍了定子绕组端部振动在线监测系统及气隙探测线圈的工作原理,以某百万机组2号发电机端部振动为例,从定子绕组端部振动和转子绕组匝间短路监测的角度,通过监测图像和数据计算分析得出机组振动的电气原因,并从实践角度解析发电机定子绕组端部振动在线监测系统在百万机组上的应用。

汽轮发电机定子线棒磨损原因分析及处理方案

大型汽轮发电机定子端部振动导致的定子线棒磨损现象,严重影响发电机的安全稳定运行。结合某1 000 MW水氢冷汽轮发电机定子线棒磨损实例,基于定子绕组结构进行原因分析,提出有针对性、合理的处理方法及措施,并在实际运行中得到验证。

Development of a Full Parameterized FE-modeling Tool for Efficient Vibration Investigations on End Windings of Turbo- and Hydro-Generators

End windings of generators are excited to vibrations due to electromagnetic forces which can cause severe damage and noise. To avoid this, it is important to predict the natural frequencies and modes of the end windings with finite elements. Due to the complex structure and unknown boundary conditions, the conventionally calculation of stator end windings has been very difficult and time consuming up to now. This paper describes the development of a full parameterized modeling tool, which allows a quick calculation of natural frequencies during the design phase of the generator. To keep the computing time low, it is important to find a way to get exact calculation results without detailed modeling of all pans. Additionally, special attention was paid to the active part, which has been replaced by spring-damper elements, and the determination of their stiffness via experimental modal analysis combined with finite element calculations.