Eccentric fault level identification of a turbo-generator based on stator vibration characteristics

An eccentric fault level identification method of a turbo-generator based on comparing stator vibration pass-band intensity and some specific frequency component's amplitude was presented here.The factors affecting vibration of the stator and the rotor were firstly analyzed and compared to demonstrate the feasibility of the proposed method.It was shown that the stator vibration is mostly affected by those faults influencing magnetic flux density,such as,air gap eccentricity.Then,the stator vibration characteristics under the normal condition and the eccentric faults were analyzed and compared,and a specific identification method was proposed.Finally,a test verification was performed on a SDF-9 fault simulating generator.It was shown that the eccentric fault level can be objectively identified with the presented method.The results provided a new thought and a reference for fault level recognition of a turbo-generator.