GAS-INSULATED ELECTRICAL INSTALLATION PROVIDED WITH A DEVICE FOR DISSIPATING ENERGY PRODUCED BY AN ELECTRIC ARC

摘要

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.