Evaluation of Fatigue Damage and Life Prediction for Turbine-Generator Shaft in Private Generation System

Abstract

Since the torsional oscillations of turbine shaft generators due to system disturbance is liable to cause fatigue life expenditure，it is necessary that evaluation be made for all the equipment including those for the operation of the power source which are required to have high reliability. This problem applies in not only a large-scale power generation unit but also a private generation system. This study proposes the torsional oscillation monitor for turbine-generator shaft using shaft torque observer in private generation system. This system provided with the functions of evaluation of fatigue damage and life prediction. This　paper discusses a cycle counter method and life prediction method for turbine-generator shaft that is appropriate for operating characteristic of private generation system.