Gas-insulated electrical installation provided with a device...

H - Electricity – 02 – B

Patent

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Details

H02B 13/065 (2006.01) H02B 13/025 (2006.01)

Patent

CA 2483982

A confinement chamber (12) of an electrical equipment is arranged on a cooling chamber (18) opening on the outside. An exhaust orifice (22) communicates the confinement chamber (12) with the cooling chamber (18). Said orifice is closed by a membrane or a valve (24). A grid (20) divides the cooling chamber into an upper volume (26) and a lower volume (28). The grid (30) supports a solid granular material layer (32) whereof the upper surface (34) remains free. Said material is preferably porous and further comprises dust particles. When there is an internal electric arc, the shock wave escaping from the confinement chamber is absorbed by the surface (34) deformation of the solid material layer (32). The incandescent particles projected through the opening are stopped by the solid material layer. The hot gases pass through the material and are cooled, causing a cloud of dust helping to prevent any post-combustion.

Une enceinte de confinement (12) d'un matériel électrique est disposée sur une enceinte de refroidissement (18) s'ouvrant sur l'extérieur. Un orifice d'échappement (22) fait communiquer l'enceinte de confinement (12) avec l'enceinte de refroidissement (18). Cet orifice est fermé par une membrane ou un clapet (24). Une grille (30) sépare l'enceinte de refroidissement en un volume supérieure (26) et un volume inférieur (28). La grille (30) supporte une couche de matériau solide granulaire (32) dont la surface supérieure (34) reste libre. Ce matériau est de préférence poreux et comporte également des poussières. En cas d'arc électrique interne, l'onde de choc s'échappant de l'enceinte de confinement est amortie par la déformation en surface (34) de la couche de matériau solide (32). Les particules incandescentes projetées par l'ouverture sont arrêtées par la couche de matériau solide. Les gaz chauds traversent le matériau et se refroidissent, provoquant un nuage de poussière contribuant à empêcher toute post-combustion.

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