Field-controlled composite insulator

H - Electricity – 01 – B

Patent

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Details

H01B 17/42 (2006.01) H01B 19/00 (2006.01)

Patent

CA 2715651

The materials of an insulator are greatly stressed by the inhomogeneous distribution of the electric field across the surface thereof. One of the causes is the design configuration of the insulator. The field strength changes particularly in the region of the fittings due to the transition from the insulating materials of the shields and the insulator core to a metal material, due to the transition from the ground potential at the cross arm, or to the conductor potential at that location, where the conductor cables are attached. A further cause is the deposit of dirt, which is stress affecting an insulator overall. The invention therefore provides that a field control layer (3) is disposed between the core (2) and the protective layer (4) in at least one section (15; 16) of the insulator (1; 10), said control layer comprising particles as the filler, which influence the electric field of the insulator.

Les matériaux d'un isolateur sont fortement sollicités du fait de la répartition non homogène du champ électrique sur sa surface. Une des causes réside dans la conception structurale d'un isolateur. En particulier dans la région des armatures, l'intensité de champ se modifie du fait de la transition entre les matériaux isolants des blindages et du coer de l'isolateur et un matériau métallique, et du fait de la transition avec le potentiel de terre sur la traverse de poteau, ou avec le potentiel de conducteur là où sont fixés les câbles conducteurs. Une autre cause concerne les dépôts de saletés, une nuisance qui concerne l'ensemble de l'isolateur. C'est pourquoi, selon l'invention, une couche de commande de champ (3), qui contient comme charge des particules agissant sur le champ électrique de l'isolateur, est disposée entre le coer (2) et la couche protectrice (4) au moins dans une partie (15; 16) de l'isolateur (1; 10).

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