H - Electricity – 01 – H
Patent
H - Electricity
01
H
H01H 83/16 (2006.01) G01R 19/12 (2006.01) H02H 1/04 (2006.01) H02H 3/253 (2006.01) H02H 3/38 (2006.01)
Patent
CA 2210857
The positive sequence voltage on the power line is measured at a given time, i.e. the present time, and also for one cycle earlier, and the ratio thereof is then compared against a threshold value of 0.9. There are four other supervisory tests which also must be true for a loss of potential condition to be indicated. These include determination of change in positive sequence current and angle and zero sequence current and angle. If the change in those values is smaller than selected thresholds, then a loss of potential condition is indicated.
La tension d'ordre positif sur la ligne d'alimentation est mesurée à un moment donné, c'est-à-dire au moment présent, et aussi pour un cycle antérieur, et le rapport de l'un à l'autre est ensuite comparé à une valeur de seuil de 0,9. Il y a quatre autres essais de surveillance qui doivent également produire des résultats vrais pour qu'une condition de perte de potentiel soit indiquée. Ces essais comprennent la détermination du changement dans le courant et l'angle d'ordre positif et dans le courant et l'angle d'ordre zéro. Si le changement de ces valeurs est inférieur aux seuils sélectionnés, une condition de perte de potentiel est indiquée.
Hou Daqing
Roberts Jeffrey B.
Ridout & Maybee Llp
Schweitzer Engineering Laboratories Inc.
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