Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-12-20
1986-01-07
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
73116, 340682, 415118, G08B 2100
Patent
active
045636753
ABSTRACT:
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 coincidence, 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.
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Miller Robert C.
Wonn James W.
Hofsass Jeffery A.
Rowland James L.
Schron D.
Westinghouse Electric Corp.
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