Turbo machinery speed monitor

Details Turbo machinery speed monitor Turbo machinery speed monitor

2008-04-08

2008-04-08

Barrera, Ramon M. (Department: 2832)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Overspeed responsive

C361S236000, C060S347000, C060S660000, C060S686000, C290S04000F

Reexamination Certificate

active

07355828

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 output switch comprising a plurality of armature clamped relays such that first armatures form a first electrical path only when both first armatures are open or when both first armatures are closed and second armatures provide a second electrical path when either or both second armatures are open or closed such that the second electrical path is discontinuous when either first armature is stuck in an open or closed position causing either second armature to remain floating between an open and closed position.

REFERENCES:
patent: 3614457 (1971-10-01), Eggenberger
patent: 3826094 (1974-07-01), Conrad, Jr. et al.
patent: 3829232 (1974-08-01), Fieglein et al.
patent: 4016723 (1977-04-01), Farley
patent: 4217617 (1980-08-01), Rossi et al.
patent: 4667114 (1987-05-01), Rossi
patent: 1052682 (1966-12-01), None

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