Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1984-10-01
1986-12-16
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 60, 361 86, 361 87, 307116, 307140, 307326, H02H 300
Patent
active
046301615
ABSTRACT:
A technique is disclosed for protecting against electrocution or shock resulting from contacting an exposed conductor which is connected to a power supply. The flow of power to the conductor, whether DC or AC, is periodically interrupted and during the interruption, contact between a body and the conductor is sensed. If the body is not contacting the conductor, power is restored, but if the body is contacting, the interruption is maintained. The circuit may also distinguish between contact with the body and contact with an electrical device which receives power from the conductor. The electrical device includes a barrier circuit, such as a diode, which switches to an electrical state, such as a high impedance state, when power is interrupted. Because the electrical characteristics of the barrier circuit, such as its capacitance, differ from those of a body, the circuit is able to detect contact with a body.
REFERENCES:
patent: 3781608 (1973-12-01), Geiger
patent: 3784842 (1974-01-01), Kremer
patent: 3997818 (1976-12-01), Bodkin
patent: 4029996 (1977-06-01), Miffitt
patent: 4175255 (1979-11-01), Linnman et al.
patent: 4507568 (1985-03-01), Ziegler et al.
American Antigravity Co., Inc.
Jennings Derek S.
Pellinen A. D.
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