Apparatus for detecting arc fault

Details Apparatus for detecting arc fault Apparatus for detecting arc fault

2006-09-12

2006-09-12

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S536000, C361S042000

Reexamination Certificate

active

07106069

ABSTRACT:
An apparatus for detecting an arc fault. The apparatus comprises a current detector for detecting the amount of change of current flowing on the wire and generating a signal proportional to the amount of change; a signal transformer for passing a high frequency component of the signal outputted from the current detector, and limiting a level of the signal not to exceed a fixed signal level; a first level limit amplifier for amplifying a signal outputted from the signal transformer so as to limit the level of the outputted signal; a signal level detector for determining whether a input signal exceeds a fixed first voltage and generating a detection signal; a pulse generator for transforming the detection signal outputted from the signal level detector into a form of normalized pulse; a first arc determination unit for counting a pulse signal outputted from the pulse generator for a predetermined time, determining whether the arc has been occurred and generating an arc detection signal; and a circuit breaker for breaking the conductive wire when the are detection signal is generated.

REFERENCES:
patent: 5420740 (1995-05-01), MacKenzie et al.
patent: 5432455 (1995-07-01), Blades
patent: 5452223 (1995-09-01), Zuercher et al.
patent: 5896262 (1999-04-01), Rae et al.
patent: 6433978 (2002-08-01), Neiger et al.
patent: 6570392 (2003-05-01), Macbeth et al.
patent: 6667691 (2003-12-01), Sapir

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