Directional element to determine faults on ungrounded power...

G - Physics – 01 – R

Patent

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G01R 31/02 (2006.01) H02H 3/16 (2006.01)

Patent

CA 2464323

The directional element, following enablement under selected input current conditions, calculates a zero sequence impedance, in response to values of zero sequence voltage and zero sequence current. The current value is selected between two possible values, one being the value from an associated current transformer, the other being the sum of the currents IA+IB+IC. The calculated zero sequence impedance is then compared against sensitive selected threshold values, established particularly for ungrounded systems. A forward fault indication is provided when the calculated zero sequence impedance is above a first established sensitive threshold value, and a reverse fault indication is provided when the calculated zero sequence impedance is below a second established sensitive threshold value.

L'invention concerne un élément directionnel permettant, lorsqu'il a été activé dans des conditions de courant d'entrée sélectionnées, de calculer une impédance homopolaire en réponse à des valeurs de tension homopolaire et de courant homopolaire. La valeur de courant est sélectionnée entre deux valeurs possibles, la première correspondant à une valeur d'un transformateur de courant associé et la seconde correspondant à la somme des courants I¿A?+I¿B?+I¿C?. L'impédance homopolaire calculée est ensuite comparée à des valeurs seuil sélectionnées sensibles adaptées à des systèmes souterrains. Une indication de défaut avant est fournie lorsque l'impédance homopolaire calculée est supérieure à une première valeur seuil sensible établie et une indication de défaut inverse est fournie lorsque l'impédance homopolaire calculée est inférieure à une seconde valeur seuil sensible établie.

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