Analysis And Applied Research On Self-excited Vibration Fault Of Turbo-generator

Based on a large number of self-excited vibration fault case, the paper classified the bearing self-excited vibration accordance with the causes, location, operating conditions when the failure occurred, and classified the steam flow excitation vibration accordance with failure severity, time of occurrence, failure causes and the unit load when failure occurred. This paper made an In-depth analysis of phenomenon of various types of faults, typical characteristics and causes for bearing self-excited vibration and steam flow excitation vibration, and concluded main features of these two faults on this basis. According to characteristics of self-excited vibration fault of the unit, the paper made a diagnosis with the steps of vibration Properties, vibration position and vibration causes, produced the fault tree of self-excited vibration of using the method of combining FMEA and FTA and proposed On-line elimination and maintenance programs. Finally, based on actual cases, the paper did simulation for bearing self-excited vibration of generator front bearing in 300MW unit and steam flow excitation vibration of 1000MW unit in a plant. The results of this study have theoretical guidance and practical value to determine and control of self-excited vibration failure of turbine-generator unit.