THE STUDY OF TORSIONAL DOUBLE FREQUENCY AND DOUBLE RESONANCE FOR LARGE HYDROGENERATOR UNIT UNDER UNSYMMETRICAL RUNNING CONDITION

摘要

we have studied double frequency and double resonance of whole torsional resonance and 100Hz resonance which excited by inverted sequence electricity under short-circle between two phases of a large -hydrogenerator unit. It was found that the vibrating amplitudes of double frequency and double resonance are much larger than that of single resonance, its resonance area is also getting wider and its dynamic shear stress is increasing greatly. All conclusions we got in this paper are helpful for and guided to engineering.