Current compensation method and device for power system...

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G01R 31/08 (2006.01) H02H 3/28 (2006.01) H02H 7/26 (2006.01) H02J 13/00 (2006.01)

Patent

CA 2427821

The present invention relates to a method for current compensation of a protection system for protecting a zone in a power system, which zone comprises a number of transmission lines connected to power sources and a number of transmission lines connected to a number of loads where the power sources and the loads are arranged outside the zone and a number of current transformers (CT) arranged to the transmission lines, wherein the method comprises the steps of continuously measuring all the incoming currents (Iin) to the zone, continuously measuring all the outgoing currents (Iout) from the zone, continuously calculating the differential current (Id) according to Id = Iin - Iout, continuously calculating q = Iout/Iin, continuously comparing q with set values and continuously comparing Iout with a set value Set1,. The invention is characterised by setting Iout = Iin = Icomp at the instant when q changes and Iout exceeds the value set1, which is an indication of the occurrence of a fault external to the protection zone due to saturation of the CT of the faulted outgoing transmission line, and using the value Icomp in the protection system in order to prevent tripping of the protection system. The present invention also relates to a device and a computer program product for performing the method.

La présente invention concerne un procédé de compensation de courant d'un système de protection destiné à la protection d'une zone d'un système de puissance, laquelle zone comprend un certain nombre de lignes de transmission connectées à des sources d'alimentation ; un certain nombre de lignes de transmission connectées à un certain nombre de charges, les sources d'alimentation et les charges étant placées en dehors de la zone, et un certain nombre de transformateurs de courant destinés aux lignes de transmission. Ce procédé consiste à mesurer en continu tous les courants entrants (I¿ent?) dans la zone ; à mesurer en continu tous les courants sortants (I¿sort?) de la zone ; à calculer en continu le courant différentiel (I¿d?) d'après I¿d? = I¿ent? - I¿sort? ; à calculer en continu q = I¿sort?/I¿ent?, à comparer en continu q à des valeurs réglées et à comparer en continu I¿sort? à une valeur réglée Set1. L'invention est caractérisée en ce que l'on règle I¿sort? = I¿ent? = I¿comp? au moment où q change et I¿sort? dépasse la valeur set1 qui indique qu'une erreur survient en dehors de la zone de protection en raison de la saturation du transformateur de courant de la ligne de transmission sortante en panne, et en ce que l'on utilise la valeur I¿comp? dans le système de protection pour prévenir le déclenchement du système de protection. La présente invention concerne également un dispositif et un produit programme d'ordinateur permettant de mettre en oeuvre ce procédé.

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