Torsional fatigue of turbine-generator shafts owing to network faults

Many studies have been made of the fatigue processes resulting from cyclic stress which the metal for making turbine generator shafts has to bear. In the paper, a modified dynamic computer program, written on the basis of these theories, is used to simulate the shaft torsional vibrations resulting from four types of power network fault. The purpose is to study the influence of a safety factor, selected in the first stage of design, on the damage accumulated following worst-case fault clearance and synchronising of the simulated machines