Arc fault detector responsive to patterns in interval to...

Details Arc fault detector responsive to patterns in interval to... Arc fault detector responsive to patterns in interval to...

2005-06-06

2008-03-25

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

Reexamination Certificate

active

07349188

ABSTRACT:
An arc fault detector analyzes patterns in a sequence of counts of interval to interval increases or decreases in integrated current for patterns characteristic of arc faults. In AC systems, the interval can be a full cycle or in an alternative embodiment, the changes in integrated current for positive and negative half cycles are separately determined and then interleaved before the change counts are calculated. The count sequence is reset when patterns characteristic of phenomena other than an arc fault are detected to avoid nuisance trips.

REFERENCES:
patent: 5561605 (1996-10-01), Zuercher et al.
patent: 5726577 (1998-03-01), Engel et al.
patent: 5835321 (1998-11-01), Elms et al.
patent: 5933305 (1999-08-01), Schmalz et al.
patent: 6504692 (2003-01-01), Macbeth et al.
patent: 6577138 (2003-06-01), Zuercher et al.

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