H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 1/00 (2006.01) H02H 7/26 (2006.01)
Patent
CA 2170536
A method and a device, after a fault has occurred in a power network, for measuring and recreating the phase currents IB prior to the occurrence of the fault by determining continuously, starting from sampled measured values of the phase currents up to the time of the fault for each phase, the amplitude I and the phase angle .PHI. of the phase currents based on two consecutive sampled measured values, whereupon a comparison is made between the last determined value Ik obtained and the rated current In of the power network. If Ik is greater than In, it is considered that a fault has occurred and the phase currents prior to the fault are indicated as IB = Ik-1.sin(.PHI.k-1 + .omega.(t-tk-1)).
Procédé et appareil de mesure des courants de phase I¿B? dans un réseau de distribution et de rétablissement de ces courants après une panne, ledit procédé consistant à effectuer sur chacune des phases une mesure continue de l'amplitude I et de l'angle de phase ? des courants de phase en fonction de deux valeurs d'échantillonnage consécutives puis à comparer la dernière valeur trouvée I¿k? au courant normal I¿n? du réseau de distribution. Si I¿k? est supérieur à I¿n?, il est considéré qu'une panne a eu lieu, les courants de phase correspondant avant la panne, à la formule I¿B? = I¿k-1?.sin(?¿k-1? + .omega.(t-t¿k-1?)).
Eriksson Leif
Saha Murari Mohan
Asea Brown Boveri Ab
Robic
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