Electrical energy meter with a precision integrator for...

G - Physics – 01 – R

Patent

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G01R 21/00 (2006.01) G01R 15/18 (2006.01) G01R 21/06 (2006.01)

Patent

CA 2083216

A current measurement circuit for an electrical energy meter of the type having an inductive current pickup which generates a signal proportional to the derivative of current with respect to time in an electrical power line. An underdamped integrator is provided which compensates for nonideal phase characteristics of the inductive current pickup including a phase deviation from 90° at the nominal line frequency. The integrator has a transfer function with a magnitude peak at a frequency below the line frequency and with a phase shift deviating from 90° at the line frequency.

L'invention est un circuit de mesure de courant pour les compteurs de courant du type à capteur de courant inductif qui produit un signal proportionnel à la dérivée du courant par rapport au temps dans la ligne de secteur. Un intégrateur sous-amorti est utilisé pour corriger les déviations de phase du capteur de courant inductif, cette déviation de phase pouvant atteindre 90 degrés à la fréquence nominale du secteur. La fonction de transfert de l'intégrateur comporte un pic à une fréquence inférieure à la fréquence du secteur avec une déviation de phase de 90 degrés par rapport au courant de secteur.

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