Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1978-03-21
1980-05-27
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361115, 361154, H02H 324
Patent
active
042053617
ABSTRACT:
Apparatus for undervoltage control of a circuit breaker includes a holding coil, a switching transistor connected in series with the holding coil, and a rectifier providing pulsating DC voltage. A level detector responsive to the output voltage of the rectifier produces an actuating signal for the switching transistor when the rectifier output voltage rises above a predetermined value. A switching regulator is provided which is connected to the level detector and the switching transistor for modulating the actuating signal when the voltage to the rectifier input rises above a predetermined value. The switching transistor is thus rendered periodically non-conducting to regulate the average voltage appearing across the holding coil.
REFERENCES:
patent: 4011484 (1977-03-01), Paice et al.
patent: 4013926 (1977-03-01), Lang et al.
patent: 4025823 (1977-05-01), Lang et al.
patent: 4041546 (1977-08-01), Stewart
Converse, Jr. Robert E.
Salce Patrick R.
Westinghouse Electric Corp.
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