Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1989-04-12
1991-01-22
Deboer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 59, 361 89, H02H 324
Patent
active
049875132
ABSTRACT:
An apparatus and method for delaying the reconnection of an electrical supply voltage to an electrical load when the supply voltage has been restored after an interruption. In its basic form, the apparatus comprises a circuit interrupter coupled between the network and the load for disconnecting the load from the network when the supply voltage has been interrupted and a sensing circuit coupled to the circuit interrupter and to the supply network for sensing when the supply voltage has been restored and for actuating the circuit interrupter to reconnect the supply and the load at a first predetermined time delay after the supply voltage has been restored. In additional embodiments, the apparatus prevents the disconnection of the network from the load during momentary interruptions of power for less than a specified amount of time, and a power saver circuit may be employed to conserve power, especially if electromechanical relays and power contactors are employed to realize parts of the apparatus.
REFERENCES:
patent: 4117526 (1978-09-01), Bates
patent: 4331996 (1982-05-01), Matsko et al.
patent: 4356526 (1982-10-01), Russell
patent: 4412267 (1983-10-01), Hansen
patent: 4855862 (1989-08-01), Wainio et al.
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