Method and device for detecting electric arc phenomenon on at least one electric cable

The invention concerns a detecting device (1) comprising a database (10) including a plurality of membership classes, whereof one first class concerns a corona phase, and an assembly (5) comprising means for measuring electric current and electric voltage on an electric cable (2), means for filtering said measurements, and means for digitizing the filtered measurements and forming two digitized data segments, as well as an assembly (8) comprising means for subjecting each of the two segments to a number of functions to constitute a form vector, means for determining the membership class of said form vector, using the database (10), and means for deducing therefrom the presence or absence of an electric arc phenomenon.