Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1990-01-23
1992-05-26
Stephan, Steven L.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 71, 361 72, 361 73, 361 74, 361 75, H02H 306
Patent
active
051173255
ABSTRACT:
An electronically controlled recloser for an electrical power distribution system is powered by at least one current transformer coupled to give an output in response to power line current. A voltage is stored on a large and a small capacitor in response to the line current and is compared with a reference voltage for determining the level of line current. When abnormally high levels of current appear on the line, it is opened for a short period of time. The energy stored on the capacitors is supplied to power the recloser during low line current conditions. At an end of a given time period following the opening of said line, the recloser recloses the line. If the abnormal condition persists, the recloser again opens and closes the line. When there is a surge of line current, the large capacitor is effectively removed from the circuit so that a response will not be delayed while the large capacitor charges; therefore, the charge on the small capacitor provide a quick start for immediate response. The circuit includes a novel circuit for converting a level of line current into a frequency which may be used by a microprocessor for selecting a mode of operations.
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Dunk Michael
Gilker Clyde
Cooper Industries Inc.
Dougherty Thomas M.
Stephan Steven L.
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