Stator Vibration Characteristic Identification of Turbogenerator among Single and Composite Faults Composed of Static Air-Gap Eccentricity and Rotor Interturn Short Circuit

Table 3

Fault identification criterion based on stator vibration characteristics.

Stator vibration characteristics	Performing condition
Having only soft 2nd harmonic vibrations	Normal condition
The vibration at 2f is increased, while the other components generally keep stable	SAGE exists
The vibration at 2f is decreased, but meanwhile vibrations at f, 3f, and 4f are increased	RISC exists
The vibration at 2f is firstly decreased and then increased; meanwhile, vibrations at f, 3f, and 4f are increased	CF exists