Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Reexamination Certificate
2007-12-19
2009-08-04
Jackson, Stephen W (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
Reexamination Certificate
active
07570465
ABSTRACT:
A method of detecting arcing conditions includes sensing current and HF signals therefrom; bandpass filtering the HF signals and providing filtered signals; detecting peak signals and envelopes from the filtered signals; counting occurrences of the envelopes exceeding a first value; maintaining temporary values corresponding to the peak signals; determining a trip time as a function of the current; determining if any peak signal is greater than a second value, and responsively increasing a temporary value and, otherwise, decreasing the temporary value; determining if a predetermined function of the temporary values is greater than a fifth value, and adding the temporary values to an accumulator, and otherwise, decreasing the accumulator; and tripping open the power circuit if: a difference between the occurrences of current and immediately previous half cycle having the same polarity is at least two, the accumulator is greater than a seventh value, and the trip time is reached.
REFERENCES:
patent: 5206596 (1993-04-01), Beihoff et al.
patent: 5224006 (1993-06-01), MacKenzie et al.
patent: 5691869 (1997-11-01), Engel et al.
patent: 5729145 (1998-03-01), Blades
patent: 5835321 (1998-11-01), Elms et al.
patent: 5933305 (1999-08-01), Schmalz et al.
patent: 5936406 (1999-08-01), Potthast
patent: 6111733 (2000-08-01), Neiger et al.
patent: 6414829 (2002-07-01), Haun et al.
patent: 6522228 (2003-02-01), Wellner et al.
patent: 6522509 (2003-02-01), Engel et al.
patent: 6542056 (2003-04-01), Nerstrom et al.
patent: 6577478 (2003-06-01), Kim et al.
patent: 6590757 (2003-07-01), Pahl et al.
patent: 6710688 (2004-03-01), Wellner et al.
patent: 6798628 (2004-09-01), Macbeth
patent: 7110864 (2006-09-01), Restrepo et al.
patent: 7148696 (2006-12-01), Zhou et al.
patent: 7161775 (2007-01-01), Schmalz
patent: 7203040 (2007-04-01), Shipp et al.
patent: 7253637 (2007-08-01), Dvorak et al.
patent: 2003/0038640 (2003-02-01), Zuercher et al.
patent: 2004/0027749 (2004-02-01), Zuercher et al.
patent: 2005/0017731 (2005-01-01), Zuercher et al.
patent: 2006/0254355 (2006-11-01), Zhou
Underwriters Laboratories, Inc., “UL 1699 Arc-Fault Circuit-Interrupters”, Apr. 7, 2006, 112 pp.
Beatty, Jr. William E.
Carolan Douglas J.
Zhou Xin
Eaton Corporation
Jackson Stephen W
Moran Martin J.
Willoughby Terrence R
LandOfFree
Industrial arc fault circuit interrupter and method of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Industrial arc fault circuit interrupter and method of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Industrial arc fault circuit interrupter and method of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4057724