Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1984-10-09
1987-03-10
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 48, 361 42, 339 14P, H02H 900
Patent
active
046494545
ABSTRACT:
An apparatus and method for continuously monitoring and detecting an open ground connection which may occur anywhere between the chassis of an electrical appliance and the grounding terminal of a receptacle. The apparatus includes a plug having a grounding blade and a sensing blade which together form an assembly adapted for insertion into the grounding terminal of the receptacle. When inserted into the grounding terminal, the grounding and sensing blades complete a closed current path formed by a sensing conductor connected to the sensing blade and a grounding conductor connected to the grounding blade. The sensing conductor is connected to an inverter and the input of the inverter is also connected through a resistor to the DC power source so as to place the small current on the sensing conductor at the input of the inverter. If an open condition is detected at any point between the appliance chassis and the grounding terminal of either the sensing or grounding conductors, the output of the inverter changes state so as to indicate an alarm condition indicating that the ground connection is not complete.
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Pellinen A. D.
Williams H. L.
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