Apparatus and method for adaptive fault detection in mv...

H - Electricity – 02 – H

Patent

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H02H 3/093 (2006.01)

Patent

CA 2736459

A method and a protective device operable to perform the method are provided, wherein the method is for detecting and analyzing faults in a first cable and one or more other cables, which convey power in a three phase feeder system. Current magnitude in the first cable is compared to a threshold level. If the current magnitude exceeds the threshold level, the duration of the condition is measured. If the duration falls within a predetermined duration range, a predetermined time interval is allowed to pass and then a determination is made whether a fault is detected in the one or more other cables. If a fault is not detected in the one or more other cables, then a determination is made that a single phase fault has occurred in the feeder system.

Linvention concerne un procédé et un dispositif de protection permettant de mettre en uvre le procédé, lequel procédé permet de détecter et danalyser des défaillances dans un premier câble et dans un ou plusieurs autres câbles qui transportent de lélectricité dans un système dalimentation triphasé. La magnitude de courant dans le premier câble est comparée à un niveau seuil. Si la magnitude de courant dépasse le niveau seuil, la durée de la condition est mesurée. Si la durée se trouve dans une plage de durée prédéterminée, on laisse sécouler un intervalle de temps prédéterminé, puis on détermine si une défaillance est détectée dans le câble ou les autres câbles. Si aucune défaillance nest détectée dans le câble ou les autres câbles, on détermine alors quune défaillance de phase unique sest produite dans le système dalimentation.

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