Inductive current sensor for an electricity meter

G - Physics – 01 – R

Patent

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Details

G01R 15/18 (2006.01) H01F 27/28 (2006.01) H01F 38/30 (2006.01) G01R 22/00 (2006.01)

Patent

CA 2442308

A current sensor for measuring one or more currents supplied from a power source to a load, the sensor comprising: (a) an inlet connecting to the source; (b) an outlet for connecting to the load; (c) one or more conductive paths (94a, 94b, 94c; 250, 260) connected between the inlet and outlet for guiding the one or more currents through the sensor; and (d) one or more sensors (70) for sensing one or more local magnetic fields generated around the one or more paths (94, 250, 260) by the current flowing therethrough, thereby providing a current measure indicative of the magnitude of the one or more currents. The sensor is distinguished in that it comprises a plurality of elongate current coil elements (78) arranged in a substantially common plane and arranged to be substantially insensitive to remotely-generated magnetic fields and responsive to the one or more local magnetic fields for generating the current measure, the coil elements (78) being disposed in zones (75, 76, 77) having more than two effective centres (see Figure 7) and exhibiting mutually opposing responses to the remote field. The sensor is susceptible for use in a fiscal power meter.

L'invention concerne un capteur de courant destiné à mesurer au moins un courant provenant d'une source d'énergie à destination d'une charge, qui comporte . (a) une admission pour se relier à la source; (b) une sortie pour se relier à la charge; (c) au moins un chemin conducteur (94a, 94b, 94c, 250, 260) reliant l'admission et la sortie de manière à guider les courants traversant le capteur; et (d) au moins un capteur (70) destiné à capter au moins un champ magnétique local généré autour des chemins (94, 250, 260) par le courant les traversant; on obtient ainsi une mesure de courant indiquant l'amplitude des courants. Le capteur se caractérise en ce qu'il comprend plusieurs éléments spiralés (78) de courant allongés disposés dans un plan sensiblement commun et de manière à être pratiquement insensibles à des champs magnétiques générés à distance et à réagir aux champs magnétiques locaux pour générer la mesure de courant: Les éléments spiralés (78) sont disposés en zones (75, 76, 77) ayant au moins deux centres réels (voir figure 7) et présentant des réactions mutuellement opposées au champ à distance. Le capteur peut être utilisé dans un compteur de puissance fiscale.

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