G - Physics – 01 – P
Patent
G - Physics
01
P
328/161, 340/148
G01P 3/489 (2006.01) H02H 7/093 (2006.01) H02P 23/00 (2006.01)
Patent
CA 1191926
ABSTRACT OF THE DISCLOSURE A digital system for monitoring the rotational speed of a rotating body, such as a turbine shaft, in order to indicate an overspeed or underspeed condition, features a readily variable reference speed limit. A reference pulse train is generated. The number of pulses from the reference pulse train is counted for a predetermined period of time proportional to a fixed number of rotations of the rotating body, and the resulting count is compared to a fixed reference count. The reference speed limit is adjusted by variation of the frequency of the reference pulse train.
412879
Ridout & Maybee Llp
Saskatchewan Power Corporation
LandOfFree
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