Patent ID: 7656626

Claim:
Electric arc detection device comprising measuring means for measuring an AC current and an AC voltage, analyzing means connected to the measuring means, and comprising computing means for computing, at the rhythm of a sequencing signal, an integral of an absolute value: of the AC current over at least one mains half-wave and supplying a current integration signal, of the AC voltage over at least one mains half-wave and supplying a voltage integration signal, differentiation means supplying a current differential signal representative of the difference between a first current integration signal and a second current integration signal measured over a period before said first integration signal, a voltage differential signal representative of the difference between a first voltage integration signal and a second voltage integration signal measured over a period before said first integration signal, decision-making means connected to the analyzing means and designed to send at least one trip signal, wherein the decision-making means comprise: a disable unit supplying adaptive disable signals, detection means each designed to supply at least one decision-making aid signal according to: at least one adaptive disable signal, and the current differential signal or the current integration signal, a decision-making unit designed to supply at least one trip signal according to the value of decision-making aid signals.