Phase selection for ground fault

Details Phase selection for ground fault Phase selection for ground fault

H - Electricity

02

H

H02H 3/16 (2006.01) H02H 3/38 (2006.01)

Patent

CA 2132203

A method and a device for phase selection for single-pole tripping of high-impedance ground faults in direct grounded power networks. Starting from the ratio of the: negative-sequence voltage to the zero-sequence current (U2/I0) and the ratio of the negative-sequence voltage to the positive-sequence voltage (U2/U1), two criteria with different conditions are formed, each of which indicating a faulted phase, and if both criteria indicate the same phase as faulted, single-pole: tripping can take place.

Méthode et dispositif de sélection de phase pour le déclenchement unipolaire d'une mise à la masse défectueuse sous forte impédance dans les réseaux d'alimentation à la mise à la masse directe. Partant du rapport de la tension inverse au courant homopolaire (U2/I0) et du rapport de la tension inverse à la tension directe (U2/U1), deux critères avec différents états sont formés, chacun d'eux indiquant une phase défectueuse, et si les deux critères indiquent que la même phase est défectueuse, un déclenchement unipolaire peut se produire.

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