Circuit interrupter including an electric arc monitoring...

G - Physics – 01 – R

Patent

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Details

G01R 31/02 (2006.01) H02H 1/00 (2006.01) H02H 3/00 (2006.01)

Patent

CA 2216544

A circuit interrupter including an improved arc detection system which trips the interrupter in response to currents having frequencies and/or characteristics associated with arcing within the associated alternating current electrical system. The arc monitoring circuit determines if the signal produced by a current transducer is a result of arcing. The arc detection system includes two swept filters and associated amplifiers which produce a signal which has an amplitude representative of the frequencies present in the alternating current of the electric system. The portion of the filtered signal which has amplitudes above a predetermined level is integrated to produce a trip signal for the circuit interrupter when the value of the integration exceeds a predetermined limit.

Interrupteur de circuit comprenant un système amélioré de détection d'arcs, déclenchant l'interrupteur en réponse à des courants ayant des fréquences et/ou des caractéristiques associées à la formation d'un arc électrique dans un système électrique à courant alternatif. Le circuit de surveillance des arcs électriques détermine si le signal transmis par un transducteur de courant résulte d'un arc électrique. Le système de détection d'arcs comprend deux filtres à balayage et des amplificateurs associés qui produisent un signal dont l'amplitude correspond aux fréquences présentes dans le courant alternatif du système électrique. La partie du signal filtré qui comporte des amplitudes supérieures à un niveau prédéterminé est intégrée de façon à produire un signal de déclenchement pour l'interrupteur de circuit lorsque la valeur de l'intégration dépasse une limite prédéterminée.

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