EVALUATION OF THE LIFE OF A TURBOGENERATOR SHAFT

An algorithm for diagnosing damage accumulation in a turbogenerator ro tor shaft is proposed for all types of turbogenerator operating condit ions. The method developed is based on determining mechanical torques arising during transients by measuring values of phase voltages and cu rrents. Using the known mechanical properties of the shaft material, t he life reduction of the shaft that is due to torsional oscillations a fter a transient is found. Depending on the load, short-term or long-t erm cyclic criteria are used. (C) 1997 Elsevier Science Ltd. All right s reserved.