Abstract
A short period of steady-state asynchronous operation after loss of excitation can improve the reliability of power supply. The damping effect of the rotor slot wedges plays an important influence on the operated ability of the turbo-generator in the stage of the asynchronous operation. The rotor slot wedges are often made of aluminum, beryllium bronze or stain steel. The different slot wedge materials not only result in the different dynamic characteristics but also affect the distribution of the rotor losses. The appropriate material selection for the rotor slot wedges is therefore a key factor that should be carefully considered in the design of turbo-generator. To adequately evaluate the asynchronous performance of turbo-generator, the rotor slot wedges with different materials will be thoroughly investigated by time-stepping finite element method (T-S FEM), which is verified by model machine. The dynamic operated ability and rotor loss of turbo-generator are calculated and compared under different materials of the rotor slot wedges. The results provide theoretic basis for generator designers to improve the asynchronous operating ability of turbo-generator.
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