Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1998-02-17
1999-02-23
Gaffin, Jeffrey
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 64, H02H 300
Patent
active
058750886
ABSTRACT:
A circuit breaker includes separable contacts for movement between a closed position and an open position. An operating mechanism, which moves the separable contacts between the closed and open positions, has a closed state and an open or tripped state which corresponds to the open position. A current transformer senses electrical current flowing through the separable contacts as a sensed current. A trip mechanism employs the sensed current for tripping the operating mechanism to the tripped position to move the separable contacts to the open position. The trip mechanism includes a microprocessor which generates short delay and ground fault trip functions of electrical current and time. The microprocessor inputs a first interlock signal from a downstream electrical switching device which generates the first interlock signal with a first value when current through the downstream device exceeds a predetermined value and with a second value otherwise. The microprocessor generates and outputs a second interlock signal to an upstream electrical switching device in response to both of the first and second trip functions. The trip mechanism selectively trips the operating mechanism as a function of the first interlock signal, the first trip function, and the second trip function.
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Lagree James L.
Matsko Joseph J.
Yanniello Robert
Eaton Corporation
Gaffin Jeffrey
Moran Martin J.
Sherry Michael J.
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