Field Telemetry of Blade-rotor Coupled Torsional Vibration at Matuura Power Station Number 1 Unit

+ executed just after the first steaming in order to verify the blade-rotor (HP, lP, 2LP's, and Generator) coupled torsional vibration frequency, which is predicted to be near twice the line frequency. ' The measured frequency is different from the double synchronous frequency,and the steam turbine's reliable operation for the negative sequence current is confirmed. This paper reports the analytical procedure for prediction of coupled vibration incorporated with a single rotor test of blade-rotor coupled vibration at the manu~facturer's factory. It also compares the predicted value and the measured results.