Margaret F Ham

US Patent:

20020125892, Sep 12, 2002

Filed:

Dec 13, 2001

Appl. No.:

10/017370

Inventors:

Michael Parker - , US
Howard Ham - Santa Inez CA, US
Margaret Ham - Fresno CA, US
James Keenan - Santa Barbara CA, US
Luc Benoit - La Canada Flintridge CA, US

International Classification:

H01H009/50
G01R031/08
G01R031/12

US Classification:

324/536000

Abstract:

Electric arc monitoring is effected by exploiting the discovery that electric arcs are fractal phenomena in that all essential information that signifies an “arc” is contained in each fractal subset. The fractal subsets are logarithmically distributed over the arc spectrum. Monitoring of arcs is most advantageously effected on a fractal subset of low logarithmic order where the amplitude is higher pursuant to the l/f characteristic of electric arcs, where cross-induction among neighboring circuits is lower, and where travel between the arc and the arc signature pickup is longer that at the high frequency customary for electric arc detection. Fractal subset information reduces the danger of false alarms. Arc signature portions may be processed in out of phase paths or treated as modulated carriers for monitoring.