Method and device for locating an insulation fault in an...

G - Physics – 01 – R

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G01R 31/08 (2006.01) H04B 3/46 (2006.01)

Patent

CA 2344241

The invention concerns a method for locating an insulation fault (Rd) in a conductor element (SCR) relative to ground connection, the conductor element being electrically accessible at least in a point of origin (Po) and a terminal point (Pe). The invention is characterised in that it consists in: injecting a current between the point of origin (Po) and the terminal point (Pe) of the conductor element (SCR), using a current or voltage generator (21) insulated from ground connection; measuring a first electric voltage (U1) at the point of origin (Po), relatively to the ground connection, and a second electric voltage (U, U2) at the terminal point (Pe). The ratio between the first (U1) and second (U, U2) measured voltages is representative of the relative position (Pdr) of the insulation fault between the point of origin (Po) and the terminal point (Pe). The invention is useful in particular for the maintenance of telecommunication cables.

L'invention concerne un procédé pour la localisation d'un défaut d'isolement (Rd) d'un élément conducteur (SCR) relativement à la terre, l'élément conducteur étant accessible électriquement au moins en un point d'origine (Po) et en un point d'extrémité (Pe). Selon l'invention, on injecte un courant entre le point d'origine (Po) et le point d'extrémité (Pe) de l'élément conducteur (SCR), au moyen d'un générateur de courant ou de tension (21) isolé de la terre, on mesure une première tension électrique (U1) au point d'origine (Po), relativement à la terre, et une deuxième tension électrique (U, U2) au point d'extrémité (Pe). Le rapport entre la première (U1) et la deuxième (U, U2) tension mesurées est représentatif de la position relative (Pdr) du défaut d'isolement entre le point d'origine (Po) et le point d'extrémité (Po). Application notamment à la maintenance des câbles de télécommunication.

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