Apparatus for detecting arc fault

Details Apparatus for detecting arc fault Apparatus for detecting arc fault

2005-11-25

2008-10-28

Sherry, Michael J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

C361S005000, C361S006000, C324S536000

Reexamination Certificate

active

07443640

ABSTRACT:
Disclosed herein is an apparatus for detecting an arc fault, which prevents a malfunction caused by a conventional current detecting method by detecting a source voltage applied onto a conductive wire to determine whether there is an arc fault, prevents a malfunction with respect to a pseudo arc signal by dividing a current detecting route into two according to the magnitude of a load current occurring onto the conductive wire to determine whether there is the arc fault by voltage detection, and lessens the danger of a fire by reducing a circuit break time according to the magnitude of the load current. A voltage detector detects the arc fault by use of two detecting routes. Each route differs in a filtering value of a filter, presence/absence of level limit, an amplification factor of an amplifier, an accumulation value of a comparator, etc. according to the magnitude of a load current occurring on a conductive wire, thereby reducing a circuit break time.

REFERENCES:
patent: 4204156 (1980-05-01), Sawada et al.
patent: 4342960 (1982-08-01), Sawada
patent: 4451786 (1984-05-01), Sawada et al.
patent: 5729145 (1998-03-01), Blades
patent: 5815352 (1998-09-01), Mackenzie
patent: 6362628 (2002-03-01), Macbeth et al.
patent: 2004/0095695 (2004-05-01), Kim et al.

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