Method and device for detecting and locating irregularities...

G - Physics – 01 – R

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G01R 31/08 (2006.01)

Patent

CA 2282605

The invention relates to a method for detecting at least one irregularity in the dielectric around a substantially elongate conductor, comprising of: applying a potential difference between the conductor and the earth; measuring at a first position voltage changes caused by said irregularity and moving in the direction of the first position; measuring at a second position voltage changes caused by said irregularity and moving in the direction of the second position; determining with the use of time registration the difference in arrival time of voltage changes caused by the same irregularity and measured at the first and second position; determining the position of the irregularity in said conductor on the basis of the difference in arrival time and the length of said conductor between the first and second position.

La présente invention concerne un procédé et un dispositif permettant de détecter et de localiser au moins une irrégularité affectant le diélectrique entourant un conducteur de forme sensiblement allongée. Ce procédé consiste: à appliquer une ddp entre le conducteur et la terre; à mesurer en un premier point les écarts de tension imputables à l'irrégularité considérée et à se déplacer en direction du premier point; à mesurer en un second point les écarts de tension imputables à l'irrégularité considérée et à se déplacer en direction du second point; à déterminer, en utilisant des moyens de mesure du temps, la différence entre l'instant d'arrivée des écarts de tension imputables à la même irrégularité et mesurés au premier et au second point; et à déterminer la position de l'irrégularité affectant le conducteur considéré sur la base de la différence concernant l'instant d'arrivée et la longueur du conducteur considéré entre le premier point et le second point.

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