Overspeed/underspeed detector
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United States of America Patent
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Jun 4, 1985
Grant Date -
N/A
app pub date -
Apr 22, 1982
filing date -
Apr 22, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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.
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