Gas-tight metal-clad bushing
AssigneeAlstom
InventorsSaturnin Alfonsi, Pascal Motro
Life of this patent
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Abstract
A bushing for high-voltage and medium-voltage gas-insulated metal-clad electrical switchgear includes a substantially cylindrical metal jacket surrounding a conductive busbar. It also includes a conductive material annular member disposed around the jacket and a cap surrounding the jacket at a distance and adapted to define with the jacket a closed space delimited at one end by the annular member, which is adapted to be sacrificed by being partly melted if an internal arc pierces the jacket and reaches it. This kind of bushing prevents molten metal and hot gases from spraying out following an internal arc.
Claims16
A bushing for gas-insulated metal-clad electrical switchgear accommodated inside a tank, including a conductive busbar extending along an axis and surrounded over a portion of its length by an insulative sleeve, and a substantially cylindrical metal jacket which contains said gas and surrounds another portion of the length of said busbar, one end of said jacket being open so that it can be connected and sealed to said tank, and another end of said jacket being closed by said sleeve, which has an inside face constituting its end surface in contact with said gas contained in said jacket, which bushing includes a conductive material annular member surrounding said jacket and situated at substantially the same level as said inside face of said sleeve along said axis of said conductive busbar and includes a cap surrounding said jacket and adapted to form with said jacket a closed space delimited by said annular member at one end.
A bushing for gas-insulated metal-clad electrical switchgear accommodated inside a tank, including a conductive busbar extending along an axis and surrounded over a portion of its length by an insulative sleeve, and a substantially cylindrical metal jacket which contains said gas and surrounds another portion of the length of said busbar, one end of said jacket being open so that it can be connected and sealed to said tank, and another end of said jacket being closed by said sleeve, which has an inside face constituting its end surface in contact with said gas contained in said jacket, which bushing includes sacrificial means for being partially melted if reached by an internal arc, said sacrificial means surrounding said jacket and situated at substantially the same level as said inside face of said sleeve along said axis of said conductive busbar and including cap means for containing molten metal and hot gas caused by said sacrificial means being partially melted by an internal arc, said cap means surrounding said jacket and adapted to form with said jacket a closed space delimited by said sacrificial means at one end.
Dependencies are inferred from the claim text.