Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1981-07-27
1982-12-07
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361100, 361 55, 363 50, 363 57, 323277, H02H 308, H02H 720
Patent
active
043630642
ABSTRACT:
An overcurrent protection system adaptable for use with power controllers the single or multi-phase ac, or dc types includes a load current sensing element in combination with an overcurrent sensing/inverse time delay circuit, a power switch and a crowbar circuit. The system also includes a drive circuit, a drive circuit input current sensor, a trip signal detector and a logic circuit. The overcurrent protection system, according to the present invention, uses the drive circuit to power the overcurrent sensing/inverse time delay circuit, to drive the power switch, and to provide a coupling path for an overcurrent fault signal across electrical isolation interface(s) thereof to the logic circuit. Thus, the need for a separate isolated power supply for powering the overcurrent sensing/inverse time delay circuit and the need for separate optical and/or electromagnetic isolation interfaces for coupling of the overcurrent fault signal are eliminated.
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Billings William W.
Luebrecht Richard E.
Mitchell James T.
Salce Patrick R.
The United States of America as represented by the Secretary of
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