Turbo machinery speed monitor

Details Turbo machinery speed monitor Turbo machinery speed monitor

2006-06-28

2008-11-18

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Overspeed responsive

Reexamination Certificate

active

07453675

ABSTRACT:
This invention relates to a speed monitor apparatus for monitoring speed and acceleration of rotating turbine equipment (turbomachinery) and for operating an overspeed trip to shut down the equipment in the event that the speed or acceleration exceed predetermined thresholds. The invention provides a speed monitor module having an input conditioner comprising: a multiplexer; an amplifier; and a comparator; in which the multiplexer selects an input signal from the sensor, or an input signal via a feedback loop from the comparator in dependence upon a test input, such that the input circuit may be tested by confirming that the amplifier oscillates when the feedback loop is enabled by the test signal.

REFERENCES:
patent: 3630839 (1971-12-01), Podolsky
patent: 3859007 (1975-01-01), Kowalski et al.
patent: 3986788 (1976-10-01), Rossi
patent: 4217617 (1980-08-01), Rossi et al.
patent: 4410948 (1983-10-01), Doniger et al.
patent: 2128376 (1984-04-01), None
Search Report, Application No. GB0513545.4, Sep. 19, 2005.
European Search Report for EP 06 11 3836, Jun. 3, 2008, EPO.

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