Electricity: electrical systems and devices – Safety and protection of systems and devices – Overspeed responsive
Patent
1978-09-22
1980-08-12
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Overspeed responsive
361236, 290 40A, H02H 706
Patent
active
042176174
ABSTRACT:
The disclosure sets forth trip circuitry for a rotating shaft machine which includes redundant overspeed protection and means for testing the overspeed protection circuit while the machine remains in operation. Moreover, further protective circuitry is provided for detecting a failure in the speed sensing system. The overspeed protection and the speed sensing failure circuit are each connected to a relay system which may actuate a trip servo valve to a closed position.
REFERENCES:
patent: 3274443 (1966-09-01), Eggenberger et al.
patent: 3829232 (1974-08-01), Fieglein et al.
patent: 3882361 (1975-05-01), Hinman, Jr. et al.
patent: 4016723 (1977-04-01), Farley
patent: 4071897 (1978-01-01), Groves, Jr. et al.
Behringer Donald F.
Fancy Thomas A.
Haven John B.
Lundberg Richard E.
Rossi Anthony J.
Ahern John F.
General Electric Company
Mitchell James W.
Salce Patrick R.
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