Power switch for preventing accidental arcs

H - Electricity – 02 – H

Patent

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Details

H02H 1/00 (2006.01) H02H 3/08 (2006.01)

Patent

CA 2686750

The invention relates to a power switch configured for the purposes of preventing accidental arcs in a low-voltage switchgear. The invention provides the power switch with an overcurrent evaluation means responding to an accidental arc produced in the switchgear. An overcurrent signal 104 arriving from the arc monitoring system LBS (occurrence of the flash of an accidental arc) is linked to the signal 103 for triggering the control means via a first evaluation means S1, 182, 63 for evaluating the intensity of the overcurrent originating from the accidental arc. The means 70 for triggering the power switch is activated, on issuing of a turn-off pulse 200, merely if the signal 180 from the current detection means 80 is above a preadjustable threshold S1. The invention allows the power switch to cut off more rapidly an overcurrent based on an accidental arc.

L'invention porte sur un commutateur de puissance configuré dans le but d'empêcher des arcs accidentels dans un appareillage de commutation basse tension. L'invention propose le commutateur de puissance avec un moyen d'évaluation de surintensité répondant à un arc accidentel produit dans l'appareillage de commutation. Un signal de surintensité 104 provenant du système de surveillance d'arc LBS (occurrence de l'éclair d'un arc accidentel) est lié au signal 103 pour déclencher le moyen de commande par l'intermédiaire d'un premier moyen d'évaluation S1, 182, 63 pour évaluer l'intensité de la surintensité provenant de l'arc accidentel. Le moyen 70 pour déclencher le commutateur de puissance est activé, sur l'émission d'une impulsion de coupure 200, simplement si le signal 180 provenant du moyen de détection de courant 80 est au-dessus d'un seuil ajustable au préalable S1. L'invention permet également au commutateur de puissance de couper plus rapidement une surintensité sur la base d'un arc accidentel.

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