Source of waveform distortion discrimination circuit and method

H - Electricity – 02 – J

Patent

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Details

H02J 3/01 (2006.01) G01R 23/20 (2006.01) G01R 31/08 (2006.01) G01R 31/40 (2006.01)

Patent

CA 2236706

A circuit to discriminate the source of harmonic distortion of the output voltage comprises voltage sensors (28, 30) coupled to the output terminals of a source of electric power (16) and to a point of regulation (24) remote from the source for sensing the output voltage waveform present at each of these locations; means (32, 34) coupled to the voltage sensors (28, 30) for calculating the percentage total harmonic content of each of the sensed waveforms, and means (36) for comparing them to determine the source of distortion; means (42) coupled to the voltage sensors (28, 30) for calculating the actual voltage difference between the two sensed voltages, and means (46) for sensing the current flowing in the feeders (18a-c) which is compared with a profile of the normal voltage drop versus connected load (48) to generate an expected voltage drop; and a protection logic circuitry (40).

Un circuit permettant de déterminer la source de distorsion harmonique d'un courant de sortie comprend des détecteurs de tension (28, 30) couplés aux bornes de sortie d'une source de courant électrique (16) et à un point de régulation (24) situé à distance de la source pour capter les formes d'onde de tension de sortie présentes à chacun de ces emplacements; des moyens (32, 34) couplés aux détecteurs de tension (28, 30) pour calculer la teneur en harmonique totale en pourcentage de chacune des formes d'ondes détectées, et un moyen (36) destiné à les comparer afin de déterminer la source de distorsion; un moyen (42) couplé aux détecteurs de tension (28, 30) pour calculer la différence réelle de tension entre les deux tensions détectées, et des moyens (46) pour détecter le courant passant dans les lignes d'alimentation (18a-c), lequel est comparé à un profil de la chute de tension normale par rapport à la charge connectée (48) afin de générer une chute de tension attendue; et un circuit logique de protection (40).

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