Subsynchronous oscillation (SSO) or torsional vibration may cause shaft of steam turbine generator hurt heavily. This phenomenon has destroyed two generator shafts in one of China’s power plant in 2008. Detailed analysis and several measurements have been taken to identify the reason of the accident. First, the operational data is analyzed, including field torsional vibration dada. Then, the modal of the shaft system is calculated. Each torsional vibration frequency is gotten with corresponding modal shape. Dangerous location of the shaft system is obtained. Third, torque value of different operation condition is calculated based on two different models: one is traditional multiple mass element rotor dynamic model and the other is an four mass element electromechanical model of rotor oscillation. Following, the maximum stress on the dangerous location is calculated using finite element method. Finally, the root cause of shaft destruction is analyzed and identified.

Volume Subject Area:
22nd Biennial Conference on Mechanical Vibration and Noise
Topics:
Generators, Steam turbines, Stress, Vibration analysis, Oscillations, Rotors, Vibration, Accidents, Dynamic models, Finite element methods, Oscillating frequencies, Power stations, Shapes, Torque
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 by ASME
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