Apparatus and method for measuring an ac current which...

G - Physics – 01 – R

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G01R 19/00 (2006.01) G01R 15/18 (2006.01)

Patent

CA 2192588

The dynamic range of a current transformer (CT) is increased without reducing the scaling of measurements at the low end of the dynamic range by designing the core of the CT to saturate only after about 90 electrical degrees of the maximum current to be measured. The measurements taken during this first 90 electrical degrees before the core saturates are doubled to in effect add measurements representing the mirror image of the first 90 electrical degrees. Timing of the digitized samples taken during the first 90 electrical degrees is adjusted to account for core reset energy errors, by determining the rate of change of current just after a zero crossing and selecting an empirically determined value of current for timing the start of the measurement samples.

Pour élargir la gamme dynamique d'un transformateur de courant (TC) sans appliquer de réduction d'échelle aux paramètres du bas de la gamme dynamique, le noyau du TC n'atteint le point de saturation qu'après environ 90 degrés électriques du courant maximal à mesurer. Les paramètres mesurés jusqu'au point de saturation sont doublés pour effectivement ajouter des paramètres symétriques des 90 premiers degrés électriques. L'échantillonnage numérisé exécuté pendant les 90 premiers degrés électriques est rajusté pour tenir compte des erreurs d'alimentation au noyau en déterminant la vitesse de variation du courant immédiatement après un passage à zéro et en choisissant une valeur empirique de courant pour marquer le début de l'échantillonnage.

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