Method and device for identifying single ground faults

Details Method and device for identifying single ground faults Method and device for identifying single ground faults

G - Physics

01

R

G01R 31/08 (2006.01) H02H 3/16 (2006.01)

Patent

CA 2170383

A method and a device for identifying, when a fault has been detected in a power network, single-phase to ground faults by determining for each phase an auxiliary current based on the present phase current, ground fault current and ground current. If the difference between two consecutive, calculated values of the auxiliary current in some phase is smaller than a predetermined limit value, this means that there is a single ground fault in this phase.

Procédé et appareil d'identification de défauts de terre sur une seule phase consistant à évaluer pour chacune des phases: un courant auxiliaire fonction du courant de phase actuel, un courant de défaut de terre et le courant de terre. Si pour l'une des phases, la différence entre deux valeurs calculées consécutives du courant auxiliaire est inférieure à une valeur limite donnée, cela indique la présence d'un défaut de terre sur ladite phase.

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