Influence of disturbances in power network on torsional torques in big power turbines-generator shafts

The mechanical data of turbines and a generator of 1000 MW reference unit, working at overcritical parameters, were established. Using the modal method, the characteristic frequencies of torsional oscillations in shafts of rotating masses were calculated. The values of torsional torques in shafts which can arise during faults in electrical networks, like close distance short-circuits, the action of automatic reclosing, synchronization, as well influence of electromagnetic torques from the network side causing the resonance oscillations of unit were investigated.