Research Article
Using Simplified Models to Assist Fault Detection and Diagnosis in Large Hydrogenerators
Table 6
Simulated shaft and bearing vibrations at upper (UJB), lower (LJB), and turbine journal bearings (TJB), with the LHG at speed-no-load (SNL) or excited, with generator rotor unbalanced (ISO grade G4.25).
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The symbol “”indicates that the shaft position is different. In the clearance condition A the pad clearances are in the nominal values (200 µm) and the shaft is centered at coordinates (0,0). In clearance condition A* the pad clearances are once more in the nominal values but the shaft has an eccentricity of 67 µm. |