Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point
Reexamination Certificate
2008-06-20
2010-12-14
Nguyen, Danny (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Arc suppression at switching point
C361S062000
Reexamination Certificate
active
07852605
ABSTRACT:
An arc-flash hazard protection system for a three-phase electrical distribution system having a plurality of switchgear interconnected with a plurality of distribution buses is disclosed. The protection system includes a plurality of first and second current transformers in signal communication with respective first and second phases of each of the plurality of switchgear, and a bus differential relay connected to receive output signals from each of the first and second current transformers of each of the plurality of switchgear to establish a bus differential protection scheme utilizing only two of the three available phases for each of the plurality of switchgear. The bus differential relay includes a processor responsive to computer executable code when executed thereon to provide a relay trip output signal to each of the plurality of switchgear in response to the bus differential protection scheme of the respective switchgear indicating an imbalanced three-phase current distribution thereat indicative of an arc-flash condition.
REFERENCES:
patent: 4933802 (1990-06-01), Haginoya et al.
patent: 7180300 (2007-02-01), Premerlani et al.
Bozek Laura L.
Georgia-Pacific Consumer Products LP
Nguyen Danny
LandOfFree
Arc-flash hazard protection system for three-phase... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Arc-flash hazard protection system for three-phase..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Arc-flash hazard protection system for three-phase... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4198837