Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1980-04-15
1982-09-21
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 62, 361 67, 364480, 364483, 340524, 340717, 340286M, 324424, 324158R, 34081506, H02H 3093
Patent
active
043510132
ABSTRACT:
A circuit interrupter includes a microcomputer-based trip unit, and a display and control panel comprising a numeric display device and a plurality of legends associated with light-emitting diodes. The trip unit presents a sequential display of numeric values of associated circuit electrical parameters and time-current trip characteristic setting values, with the currently visible numeric quantity being identified by an energized light emitting diode and associated legend. The control panel also includes a test switch for initiating a test operation and a potentiometer for selecting a desired simulated fault current value for the test operation. The test capability is provided simultaneously with normal circuit breaker operation which maintains full protection of the associated circuit. A short-delay feature is provided having a selectable i.sup.2 t characteristic with adjustment of both pick-up and time parameters.
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Engel Joseph C.
Matsko Joseph J.
Mercier Bernard J.
Wafer John A.
Converse, Jr. Robert E.
Salce Patrick R.
Westinghouse Electric Corp.
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