Method and device for detecting accidental arcs

Details Method and device for detecting accidental arcs Method and device for detecting accidental arcs

2005-03-29

2005-03-29

Le, N. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S512000, C324S520000

Reexamination Certificate

active

06873161

ABSTRACT:
The invention relates to a method for detecting accidental arcs (arc tracking) on a cable (1), especially on a cable of an aircraft electrical system. According to said method, an alternating current signal (I(t)) that has been detected is sampled time-discretely and a trigonometric function (I(k)) imitating the alternating current characteristic is determined by interpolation of a number of sampling values (y(k)). The current alternating frequency (ω) is then derived from this trigonometric function. The result of a comparison of the current alternating current frequency (ω) and a set or reference frequency (ω′) is used to determine the presence of an accidental arc (ISA,IGA) and a warning signal (Sarc) is optionally generated. A device which functions according to this method is advantageously integrated into a circuit-breaker (7) for the aircraft electrical system, so that the latter is equipped to detect and deactivate accidental arcs that occur on the electrical system cable (1).

REFERENCES:
patent: 4710708 (1987-12-01), Rorden et al.
patent: 5561605 (1996-10-01), Zuercher et al.
patent: 6625550 (2003-09-01), Scott et al.
patent: 40 29 141 (1992-03-01), None
patent: 0 639 879 (1995-02-01), None

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