G - Physics – 08 – B
Patent
G - Physics
08
B
340/124
G08B 21/00 (2006.01) G01R 31/34 (2006.01)
Patent
CA 1216914
16 ABSTRACT OF THE DISCLOSURE A rub detector for rotating machines such as turbines wherein a grounding arrangement for the turbine rotor is monitored to detect coincidence between a rotor potential discharge and resulting current flow through the grounding arrangement. In the absence of such coinci- dence, a rub is suspect. In another arrangement in which a grounding strap is utilized, the strap is elevated from ground by means of a diode arrangement and the rotor voltage is monitored and compared with a predetermined reference which may not be exceeded. If the reference potential is attained by the rotor, then the rotor is discharged such that during cyclical operation, a certain discharge waveform is produced, and which waveform is modified in the presence of a rub condition. Means are also provided for imparting a potential to the rotor during initial start-up conditions.
442380
Miller Robert C.
Wonn James W.
Oldham And Company
Westinghouse Electric Corporation
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