Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1975-08-29
1977-03-15
Miller, J. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 98, 361 87, H02H 308
Patent
active
040126692
ABSTRACT:
A device for detecting a persisting electrical overload in an electrical system includes means for monitoring an electrical parameter in the electrical system and for generating an electrical signal whose magnitude represents the instantaneous absolute value of the parameter, reference means which generates an output signal of predetermined value and which develops, in cooperation with the monitoring means, an electrical signal whose magnitude represents the amount by which the magnitude of the absolute value signal exceeds the predetermined value, integrator means to integrate the aforementioned electrical signal and to generate an output whose magnitude includes a component representative of the product of the electrical signal and a time-increasing value that represents the duration that an overload has persisted; and comparator means to continuously compare the magnitude of the integrator output signal with a second preselected value and which generates an indicative output whenever the integrator output signal exceeds the second preselected value.
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Gelfand Peter C.
Mason Clifford A.
Envirotech Corporation
Krebs Robert E.
MacDonald Thomas S.
Miller J. D.
Salce Patrick R.
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