Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1995-10-24
1998-08-11
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361107, 361 38, 361 54, 307 90, H02H 300
Patent
active
057935939
ABSTRACT:
The present invention features a method and an apparatus for distributing electrical power from a power source to a distribution transformer, using at least one hot-phase conductor, a neutral conductor and an independent ground conductor. The neutral conductor is connected to the ground conductor at only one point in the distribution system, preferably at or near the power source. Normal imbalance current flows only in the neutral conductor. Return current flow in the earth is eliminated by the single point neutral-to-ground connection. Magnetic field (MF) generation in this power distribution system is thus reduced and stray voltage problems eliminated. In addition, high-impedance faults are easily detected because the only current ever flowing in the ground conductor is fault current. A method is also described for converting existing power distribution systems to the independent ground topology of the present invention.
REFERENCES:
patent: 1938732 (1933-12-01), Vaage
patent: 2214134 (1940-09-01), Herz
Hall Leon D.
Reed Robert G.
Gaffin Jeffrey A.
Medley Sally C.
New York State Electric & Gas Corporation
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