Instantaneous overcurrent element for heavily saturated...

H - Electricity – 02 – H

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H02H 3/02 (2006.01) H02H 1/00 (2006.01) H02H 1/04 (2006.01) H02H 3/00 (2006.01) H02H 3/08 (2006.01) G06F 19/00 (2006.01)

Patent

CA 2488045

The instantaneous overcurrent element, used in a microprocessor-based protective relay for a power system, includes a finite impulse response filter which generally is a cosine filter and is responsive to the current waveform from the current transformer for fault determination unless the distortion in the current reaches a preselected threshold, at which point a peak detector circuit is used to provide the current magnitude values for fault determination. The RMS value from circuit (88) is compared against the threshold value in comparator (90).

Elément de surintensité instantanée utilisé dans un relais de protection basé sur un microprocesseur, pour un système électrique, comportant un filtre à réponse impulsionnelle finie qui est généralement un filtre en cosinus et qui répond à la forme d'onde de courant provenant du transformateur de courant pour la détermination de défauts, à moins que la distorsion du courant n'atteigne un seuil prédéterminé, auquel cas un circuit détecteur de crête est utilisé pour fournir les valeurs d'amplitude de courant en vue de la détermination des défauts. La valeur quadratique moyenne produite par le circuit (88) est comparée à la valeur de seuil dans le comparateur (90).

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