Method and apparatus for evaluating rapid changes in current

Details Method and apparatus for evaluating rapid changes in current Method and apparatus for evaluating rapid changes in current

G - Physics

01

R

G01R 15/08 (2006.01) G01R 31/02 (2006.01) H02H 1/00 (2006.01)

Patent

CA 2680385

In order to detect and evaluate current changes as a result of electric arcs, a sensor signal (di/dt) that is differentiated by time (t) and has a sensor-dependent frequency bandwidth (fgo1 - fgu) is produced, the upper limit frequency (fgoi) of which is 40 MHz and the lower limit frequency (fgu) of which is 100 kHz, wherein the sensor signal (SA) is used to produce an evaluation signal (S'A) having an upper limit frequency (fgo2) that is less than or equal to 10 MHz, the evaluation signal (S'.ALPHA.) is compared to a threshold value and a standardized signal (SD, S'D) is produced, and wherein the pulse duration of the signal (SD, S'D) is lengthened to a predefined time value (.DELTA.t2).

Pour la saisie et l'évaluation de variations de courant dues à des arcs électriques, un signal de capteur (di/dt) est généré, ce signal étant différencié dans le temps (t) et présentant une gamme de fréquence (fgo1 - fgu) dépendant du capteur, sa fréquence limite supérieure (fgoi) étant de 40MHz et sa fréquence limite inférieure (fgu) de 100 kHz. Un signal d'évaluation (S'A) est généré à partir du signal de capteur (SA), la fréquence limite supérieure (fg02) de ce signal étant inférieure ou égale à 10MHz, le signal d'évaluation(S'.ALPHA.) est comparé à une valeur seuil et une signal normé (SD, S'D) est généré, et la durée d'impulsion du signal (SD, S'D) est prolongée pour atteindre une valeur de temps (.DELTA.t2) prescrite.

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