| 摘要 |
An arc fault circuit interrupter includes separable contacts, an operatin g mechanism, a current sensor sensing current flowing through the contacts a nd 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, an d responsively inhibits the detection for a first predetermined time, and wh ether a second predetermined plurality of half-cycles occur in succession, e ach with smaller peak amplitude than that of an immediately preceding half-c ycle 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 responsi vely indicates that any of the half-cycles having a peak amplitude greater t han a predetermined amount is a parallel arc.
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