Arc fault circuit interrupter and method of parallel arc...

Details Arc fault circuit interrupter and method of parallel arc... Arc fault circuit interrupter and method of parallel arc...

2007-02-27

2009-12-15

Paladini, Albert W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

C361S043000, C361S044000, C361S045000, C361S046000, C361S047000, C361S048000, C361S049000, C361S050000, C361S093100

Reexamination Certificate

active

07633728

ABSTRACT:
An arc fault circuit interrupter includes separable contacts, an operating mechanism, a current sensor sensing current flowing through the contacts and outputting a sensed current, and a processor determining and storing peak values of the sensed current for plural half-cycles. The processor provides arc fault detection, determines whether a first predetermined plurality of half-cycles occur in succession and correspond to non-unity power factor, and responsively inhibits the detection for a first predetermined time, and whether a second predetermined plurality of half-cycles occur in succession, each with smaller peak amplitude than that of an immediately preceding half-cycle of like or differing polarity, and responsively inhibits the detection for a second predetermined time. The processor determines that the detection is not inhibited for the first and second predetermined times, and responsively indicates that any of the half-cycles having a peak amplitude greater than a predetermined amount is a parallel arc.

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Underwriters Laboratories, Inc., “UL 1699 Arc-Fault Circuit-Interrupters”, Apr. 7, 2006, 112 pp.

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