H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 3/26 (2006.01) H02H 3/28 (2006.01)
Patent
CA 2136341
A method and a device for preventing understabilization of longitudinal differential protections in case of external faults and current transformer saturation. The invention comprises an extension of the state of the art with regard to stabilization of longitudinal differential protections in such a way that the values (A1, A2, ... An), (.PHI.1, .PHI.2, ... .PHI.n), obtained via current measurement (C1, C2, ... Cn) and Fourier filters (4, 5, 6), for determining the function characteristic of the protection under certain conditions as regards current amplitude and current transformer saturation are given corrected values (A1k, A2k, ... Ank), (.PHI.1k, .PHI.2k, ... .PHI.nk).
Méthode et dispositif visant à empêcher la sous-stabilisation de protections différentielles longitudinales en cas de défauts extérieurs et de saturation du transformateur d'intensité. L'invention améliore la technologie de pointe relative à la stabilisation de protections différentielles longitudinales, en faisant en sorte que les valeurs (A1, A2, ... An), (.PHI.1, .PHI.2, ... .PHI.n) obtenues par mesure du courant (C1, C2, ...Cn) et filtrage de Fourier (4, 5, 6) pour déterminer la caractéristique fonctionnelle de la protection dans certaines conditions d'amplitude du courant et de saturation du transformateur d'intensité, soient corrigées (A1k, A2k, ... Ank), (.PHI.1k, .PHI.2k, ... .PHI.nk).
Saha Murari Mohan
Wennerlund Per
Asea Brown Boveri Ab
Robic
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