Electricity meter

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G - Physics

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G01R 1/30 (2006.01) G01R 15/12 (2006.01) G01R 21/133 (2006.01) G01R 22/00 (2006.01) G01R 35/00 (2006.01) G01R 35/04 (2006.01)

Patent

CA 2227288

In order to allow an electricity meter (1) to perform comprehensive self- monitoring of its measurement channels, it is proposed that the input signals, in particular the detected current and voltage signals (I1-I3 and U1-U3 respectively) should be detected in double via different signal channels (3a- 3c) using sigma-delta modulators (15a-15c). A digital signal-processing unit (5) situated downstream conducts plausibility monitoring of the detected signals (I1-I3, U1-U3), an error signal being produced according to error type or signal deviation.

Pour permettre à un compteur électrique (1) d'exécuter un auto-contrôle complet de ses canaux de mesure, il est proposé que les signaux d'entrée, en particulier les signaux de courant et de tension (I1 à I3 et U1 à U3), soient détectés en double par l'intermédiaire de différents canaux à signal (3a, 3c) au moyen de modulateurs sigma-delta (15a, 15C). Une unité numérique de traitement de signaux (5) montée aval effectue une surveillance de plausibilité des signaux détectés (I1-I3, U1-U3), un signal d'erreur étant produit selon le type d'erreur ou d'écart de signal.

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