Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1983-06-22
1986-01-28
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 98, H02H 308
Patent
active
045675406
ABSTRACT:
A power supply is provided for energizing a trip signal generator and for selectively operating a device in response to the detection by the trip signal generator of overcurrent in a alternating current line. The power supply receives input of full-wave rectified current that is directly proportional to the alternating current in the line. A regulator circuit is also provided to power the trip signal generator and other circuitry. When current initially flows in the line the regulator rapidly produces an output voltage approximately equal to the input voltage up to a first voltage level. When the input voltage exceeds that level, the output voltage of the regulator increases at a slower rate than the input voltage to permit regulation of the output voltage. When energized, the output voltage is regulated at a predetermined constant level. The power supply also includes an energy storage circuit for supplying the input voltage to the regulator and to a circuit interrupter when desired. A control portion in conjunction with a switch portion alternately shunts current away from or permits current to flow to the energy storage portion and regulator portion to maintain the voltage across the energy storage portion within a predetermined range. The predetermined voltage range of the energy storage circuit is shifted higher upon receipt of a signal from the trip signal generator to increase the amount of energy stored in the energy storage circuit for interrupting the circuit in the line.
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Lapacek James V.
Moose Jr. Harry E.
S&C Electric Company
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