Method and device for power system protection

H - Electricity – 02 – H

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H02H 3/28 (2006.01) H02H 3/44 (2006.01)

Patent

CA 2406313

The present invention relates to a method 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, 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, and continuously calculating the differential current (Id) according to Id = Iin - Iout. The method is characterised in continuously integrating Iin, Iout and Id according to Formula (I), where T is the fundamental frequency cycle, whereby changes of the continuously integrated values IIN, IOUT and ID constitute indications of whether faults on the power system occur within or outside the zone. The present invention also relates to a device and computer program product for performing the method.

La présente invention concerne un procédé de protection d'une zone d'un système générateur. Cette zone comprend un certain nombre de lignes de transmission reliées à des sources d'énergie et un certain nombre de lignes de transmission reliées à un certain nombre de charges, ces sources d'énergie et ces charges étant placées en dehors de ladite zone. Ce procédé consiste : - à mesurer en continu tous les courants (¿in?) entrant dans la zone ; à mesurer en continu tous les courants sortant (I¿sort?) de la zone, et à calculer en continu le courant différentiel (I¿d?) d'après l'équation I¿d? = I¿entr. ? - I¿sort.?. Ce procédé est caractérisé par l'intégration continue de I¿entr.?, I¿sort? et I¿d? d'après l'équation (I) où T représente le cycle de fréquence fondamentale, sachant que les modifications des valeurs intégrées en continu I?ent?, I¿sort ? et I¿D? permettent de déceler si des erreurs surviennent dans le système générateur à l'intérieur ou à l'extérieur de ladite zone. La présente invention concerne également un dispositif et un produit programme d'ordinateur permettant de réaliser ce procédé.

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