Directionally vented underground distribution surge arrester

H - Electricity – 01 – C

Patent

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Details

H01C 7/12 (2006.01)

Patent

CA 2056274

The invention is directed to the provision of an external shield about the periphery of the housing (102) of a surge arrester (100) containing one or more arrester devices (116) to provide an expansion limiting device which permits the housing to expand to a degree necessary to permit the expulsion of arc-generated gases within the housing while limiting the total expansion to a level below the elastic limit of the housing to prevent its destruction and permit its recovery after the gases have been dissipated. The shield may be made of metal, elastomeric materials, reinforced elastomeric materials or plastic, and the shield may be supported about the housing by an external strap (144) of metal, plastic or elastomeric materials or may be supported by a plurality of fins (142) arranged along the periphery of the housing and engaging an edge of the shield on its internal surface.

L'invention consiste à fournir un écran externe autour du boîtier (102) d'un protecteur de surtension (100) contenant un ou plusieurs déchargeurs (116) pour fournir un dispositif limiteur de dilatation qui permet au boîtier de se dilater suffisamment pour permettre l'expulsion des gaz générés par la formation d'arcs électriques à l'intérieur du boîtier tout en limitant la dilatation totale à un niveau inférieur à la limite élastique du boîtier afin d'éviter la destruction de ce dernier et de permettre sa récupération après la dissipation des gaz. L'écran peut être fabriqué en métal, en élastomères, en élastomères renforcés ou en plastique, et il peut être supporté autour du boîtier par une sangle externe (144) en métal, en plastique ou en élastomères ou par un ensemble d'ailettes (142) disposées sur la périphérie du boîtier et qui fait pénétrer un bord de l'écran sur sa surface interne.

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