Abstract
This paper presents the diagnosis and cause analysis method for the abnormal vibration of turbine generator shaft system that occur as a result of out-of-phase synchronization of a generator of the power plant. In addition, it introduces the practical example of correcting the generator high vibration to the power generation industry. The torque applied to the shaft system because of the out-of-phase synchronization was calculated, and the change in shaft vibration with respect to applied torque was analysed using the vibration signal analysis. Lastly, various corrective actions are explained for the shaft vibration reduction during planned preventive maintenance. The vibration was finally stabilized by replacing the generator shrunk-on coupling.
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