Acquiring phasors outside the frequency tracking range for...

G - Physics – 01 – R

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G01R 19/06 (2006.01)

Patent

CA 2719513

A system and method for acquiring phasors outside of the frequency tracking range for power protective relays. As the frequency of a power system varies from the rated frequency, phasors calculated from such samples include errors. A frequency tracking range is used to sample the signal waveform at a rate corresponding to the frequency when the frequency is within the frequency tracking range. When the frequency is outside of the frequency tracking range, the signal waveform is sampled at a rate corresponding with the maximum or minimum of the frequency tracking range depending on whether the frequency exceeds or falls below the frequency tracking range. The difference between the frequency and the minimum or maximum of the frequency tracking range is used to correct the measured phasors to result in accurate phasors.

L'invention porte sur un système et une méthode d'acquisition de phaseurs hors de la plage de poursuite de fréquences pour relais protecteurs d'alimentations. Comme la fréquence d'un système d'alimentation diverge de la fréquence normale, les phaseurs calculés à partir de tels échantillons incluent des erreurs. On utilise une plage de poursuite de fréquences pour échantillonner la forme d'onde du signal à un rythme correspondant à la fréquence quand la fréquence se situe dans la plage de poursuite de fréquences. Lorsque la fréquence se situe hors de la plage de poursuite de fréquences, on échantillonne la forme d'onde du signal à un rythme correspondant au maximum ou au minimum de la plage de poursuite de fréquences, selon que la fréquence lui est supérieure ou inférieure. On utilise la différence entre la fréquence et le maximum ou le minimum de la plage de poursuite de fréquences pour corriger les phaseurs mesurés et obtenir des phaseurs précis.

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