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

A method of detecting an electrical arcing phenomenon on at least one electrical cable, wherein:

• A/ determining, in a preliminary step, a database comprising a plurality of classes, including a first class relating to a corona discharge phase to be detected and at least one second class relating to phenomena liable to interfere with the detection process;
• and
• B/ in a subsequent detection step, successively:
• a) in an acquisition phase:
• α) carrying out an electrical current measurement and an electrical voltage measurement directly on said electrical cable;
• β} filtering said current and voltage measurements obtained in this way;
• and
• γ) digitizing the measurements filtered in this way to form two digitized data segments relating to the electrical current and to the electrical voltage, respectively;
• and
• b) in a subsequent processing phase:
• α) subjecting each of said segments to a plurality of particular functions each generating a scalar magnitude, the set of scalar magnitudes relating to the current forming a first vector and the set of scalar magnitudes relating to the voltage forming a second vector;
• β) determining the class to which said shape vector belongs using said database and a shape vector obtained from said first and second vectors that is representative of the measurements carried out;
• and
• γ) concluding that:
• an electrical arcing phenomenon exists if said class represents said first class relating to a corona discharge phase;
• and
• there is no electrical arcing phenomenon otherwise.