Coil deterioration diagnostic method and coil deterioration...

G - Physics – 01 – R

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Details

G01R 31/06 (2006.01) G01M 3/40 (2006.01) G01R 31/34 (2006.01)

Patent

CA 2483567

According to a coil deterioration diagnostic method of the present invention, a conductor to be cooled directly by a medium is covered with an insulation layer, a coil is constituted of internal electrodes to be wrapped in an insulation layer, an AC voltage is applied to the conductor of the coil, a potential of the internal electrode is measured by a potential measuring probe facing the coil, and if a measured potential is higher than the potential of a sound coil, it is discriminated that the medium leaks out from the conductor to the insulation layer and an insulation thereof is deteriorated. According to above-mentioned structure, an improved coil deterioration diagnostic method and an improved coil deterioration diagnostic apparatus applied to this diagnostic method can be provided, capable of detecting, easily, accurately and securely through an easy procedure, an insulation deterioration on a coil generated by leakage of water from a conductor to an insulation layer upon operation with the conductor cooled directly by water.

L'invention concerne un procédé de diagnostic de détérioration d'une bobine dans lequel la bobine est constituée d'un conducteur refroidit directement par un milieu, revêtu d'une couche isolante, et d'une électrode interne insérée dans la couche d'isolant, consistant à appliquer une tension de CA au conducteur de la bobine, le potentiel de l'électrode interne étant mesuré grâce à une sonde de potentiel disposée face à la bobine. Lorsque le potentiel mesuré est plus élevé que le potentiel d'une bonne bobine, il s'ensuit que par une fuite le milieu est passé du conducteur à la couche isolante et que la couche isolante s'est détériorée. Selon l'agencement de l'invention, on met en oeuvre un procédé et un système de diagnostic de détérioration d'une bobine dans lesquels la détérioration de l'isolation de la bobine due à une fuite d'eau passant du conducteur à la couche d'isolant peut être détectée précocement avec sûreté et précision au moyen d'un processus facile lors du fonctionnement de la bobine dont le conducteur est refroidi directement par de l'eau.

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