Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1988-11-22
1989-08-29
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 86, 361 89, 361 97, H02H 3093
Patent
active
048623121
ABSTRACT:
A circuit breaker device comprises a rectifier circuit connected to the secondary winding of the current transformer to convert the AC secondary current into a unidirectional current. A DC constant voltage power supply circuit is connected across the output terminals of the rectifier circuit and produces positive, negative and intermediate potentials. A time delay circuit powered from the power supply circuit and connected to receive the output signal of said differential amplifier circuit proportional to said unidirectional current and producing a predetermined time delay with respect to a predetermined magnitude of said unidirectional current. An electromagnetic trip coil connected in series with said switch circuit, the series circuit of said electromagnetic trip coil and said switch circuit is connected to be energized by the output of said rectifier circuit. The time delay circuit comprises a long time delay trip circuit which comprises a capacitor charged by a current corresponding to the fault current, and a current compensation circuit for compensating the leak current of said capacitor.
REFERENCES:
patent: 3602783 (1971-08-01), Engle et al.
patent: 3818275 (1974-06-01), Shimp
patent: 4347541 (1982-08-01), Chen et al.
patent: 4375072 (1983-02-01), Rice
patent: 4567540 (1986-01-01), Ruta
Deboer Todd E.
Mitsubishi Denki & Kabushiki Kaisha
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