System and method for calibration of data in an electric...

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G01R 21/133 (2006.01) G01D 3/032 (2006.01) H02J 13/00 (2006.01) H02J 3/00 (2006.01)

Patent

CA 2452352

The error compensating system and method is used in electric power monitoring systems, e.g. protective relays, and includes a test unit (34) for applying a test signal to the front end of a data acquisition section of the power monitoring system and a phase reference module (30) which converts the test signal to a square wave having falling and rising edges corresponding to transitions between the positive and negative portions of the test signal. A programmable logic device (20) determines the zero crossings of the sampled digital signal from the data acquisition system and then determines the time difference between a falling edge of the module output signal and the zero crossing (52) of the sampled digital signal. The time difference (54) is representative of the phase shift produced by the data acquisition components (16,18). A compensation circuit adjusts the digitally sampled signals with the amount of the determined phase shift.

Cette invention concerne un système et un procédé de compensation d'erreurs s'utilisant dans des systèmes de surveillance d'installations de fourniture d'énergie électrique, tels que des relais de protection, qui comprend une unité d'essai destinée à appliquer un signal d'essai à l'avant dune section d'acquisition de données du système de surveillance et un module de référence de phase qui convertit le signal d'essai en une onde rectangulaire dont les flancs descendants et montants correspondent aux transitions entre les parties positives et négatives du signal d'essai. Un dispositif logique programmable détermine les passages par zéro du signal numérique échantillonné à partir du système d'acquisition de données, puis le différentiel de temps entre le flanc descendant du signal de sortie de module et le passage par zéro du signal numérique échantillonné. Le différentiel de temps représente le déphasage produit par les composants d'acquisition de données. Un circuit de compensation ajuste les signaux échantillonnés numériquement au moyen de la valeur de déphasage.

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