System for measuring the alternating current equivalent...

G - Physics – 01 – R

Patent

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G01R 27/16 (2006.01)

Patent

CA 2297066

The present invention relates to a system and a method for measuring the alternating current equivalent series resistance of a conductor, in particular when transporting a large current, i.e. of the order of a few thousand Amperes (around 3000 A); the system comprises: a current sensor connected to the said conductor able to deliver a measurement current having a real component only, and having a predetermined relationship with the said alternating current; a current voltage converter connected to the said current sensor having a predefined conversion ratio with the said measurement current, for converting the said measurement current into a corresponding voltage; a voltage divider connected to the said converter capable of delivering an adjustable division of the said corresponding voltage; a voltage sensor applied over a predetermined length of the said conductor able to deliver a measured voltage having at least a real component; a null indicator receiving the said measured voltage and the said adjustable division, able to indicate the balancing between the real components of the said measured voltage and of the said adjustable division; a voltage meter able to deliver the value of the said adjustable divison and of the said corresponding voltage.

La présente invention concerne un système et un procédé de mesure de la résistance série équivalente, en courant alternatif, d'un conducteur, notamment lorsque ce conducteur transporte un courant important, à savoir de l'ordre de quelques milliers d'ampères (environ 3000 ampères). Ce système comprend: un capteur de courant connecté au conducteur et capable de donner un courant de mesure contenant une seule composante active et possédant un rapport déterminé avec ledit courant alternatif; un convertisseur courant/tension connecté au capteur, possédant un rapport de conversion défini avec le courant de mesure, et destiné à convertir ce courant de mesure en une tension correspondante; un diviseur de tension connecté au convertisseur et capable de fournir une division réglable de la tension correspondante; un capteur de tension appliqué sur une longueur déterminée du conducteur et capable de fournir une tension mesurée possédant au moins une composante active; un indicateur de zéro, lequel reçoit la tension mesurée et la division réglable et est capable d'indiquer l'équilibrage entre les composantes actives de la tension mesurée et celles de la division réglable; ainsi qu'un voltmètre, capable de fournir la valeur de la division réglable et celle de la tension correspondante.

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