Arc fault circuit interrupter and method of detecting an arc...

Details Arc fault circuit interrupter and method of detecting an arc... Arc fault circuit interrupter and method of detecting an arc...

2004-09-28

2008-10-21

Sherry, Michael J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

C361S005000, C361S006000, C361S007000, C361S044000

Reexamination Certificate

active

07440245

ABSTRACT:
An arc fault circuit interrupter includes separable contacts, an operating mechanism adapted to open and close the separable contacts, and a trip mechanism cooperating with the operating mechanism to trip open the separable contacts. The trip mechanism includes a peak detector determining a peak amplitude of a current pulse of the current flowing in a power circuit. A microprocessor determines whether the peak amplitude of the current pulse is greater than a predetermined magnitude. A plurality of routines including a time discounted accumulation algorithm, a short delay algorithm and a series time discounted accumulation algorithm, employ the peak amplitude to determine whether an arc fault condition exists in the power circuit.

REFERENCES:
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patent: 6522228 (2003-02-01), Wellner et al.
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patent: 6710688 (2004-03-01), Wellner et al.
patent: 7161775 (2007-01-01), Schmalz
patent: 2005/0259369 (2005-11-01), Schmalz

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