Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Reexamination Certificate
2007-06-05
2007-06-05
Jackson, Stephen W. (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
C361S093100, C361S093500, C361S093600
Reexamination Certificate
active
11225585
ABSTRACT:
An apparatus and a method of detecting arc faults that have reduced susceptibility to nuisance tripping. The apparatus includes a current sensor, a differential current input sense circuit, a differential current (di/dt) characteristics sense circuit, an absolute current input sense circuit, an absolute current characteristics sense circuit, a power supply, a tripping circuit, a processing unit, and an electromechanical interface. The di/dt characteristics sense circuit provides information relating to the characteristic di/dt signature of a power line current. The absolute current characteristics sense circuit provides information relating to the absolute current waveform characteristics of the power line current. The processing unit correlates the di/dt characteristics to the absolute current characteristics to distinguish between electrical arc faults and nuisance loads, thereby reducing the susceptibility of the apparatus to nuisance tripping.
REFERENCES:
patent: 7003435 (2006-02-01), Kolker et al.
U.S. Appl. No. 10/937,487, filed Sep. 9, 2004 entitled Method for Detecting Arc Faults.
U.S. Appl. No. 10/314,715, filed Dec. 9, 2004 entitled Arc Detection Apparatus and Method.
Nicolls Christopher A.
Parker Michael
Pellon Christian V.
Rabiner Mark D.
Baumann Russell E.
Jackson Stephen W.
Patel Dharti H.
Sensata Technologies, Inc.
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