Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1997-09-15
1999-03-23
Gaffin, Jeffrey
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 62, 361 93, 361115, H02H 300
Patent
active
058868615
ABSTRACT:
An arc fault detector turns on an electronic switch connecting a power distribution cable to ground thereby actuating a cable limiter to isolate the power distribution cable in response to an arc fault even though the arc fault itself does not create a low enough impedance fault to actuate the cable limiter directly. The electronic switch can be a sacrificial low cost silicon controlled rectifier which is destroyed by the ground fault it creates as long as the let-through current of the cable limiter is below the explosion current of the SCR. A single arc fault detector and SCR which fails as a short circuit can be used to actuate cable limiters at both ends of a short power distribution cable fed at both ends, or preferably separate protection can be provided adjacent both cable limiters.
REFERENCES:
patent: 3750075 (1973-07-01), Cooper, Jr.
patent: 4314300 (1982-02-01), Griffith
patent: 5224006 (1993-06-01), Mackenzie et al.
patent: 5452223 (1995-09-01), Zuercher et al.
patent: 5519561 (1996-05-01), Mrenna et al.
Eaton Corporation
Gaffin Jeffrey
Jackson Stephen
Moran Martin J.
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