Patent ID: 6342685
Filing Date: 2002-01-29
Classification: H01H

Abstract:
A dual contact motion multi-pole high-voltage circuit-breaker in which each pole includes a case (1) defining a break chamber (2) to be filled with dielectric gas, said circuit-breaker comprising:two aligned conductive tubes (3, 4) each connected to a different external connection terminal; a semi-moving assembly and a moving assembly which move along a common axis and are interconnected by a wear contact member and a permanent contact member, wherein the semi-moving assembly includes the permanent contact member and the moving assembly includes the wear contact member; said permanent contact member including an outside wall of a first conductive member (6) for sliding inside an annular permanent contact member (9) of the moving assembly, said annular permanent member electrically connected to a wall of one of the fixed tubes (4) and carried by a second conductive member (5) adapted to slide in the other fixed tube (3) to which said second conductive member is electrically connected, and said wear contact member including a conductive termination (10) mounted at the end of a conductive support rod (11) fixed axially inside said second conductive member, said rod for penetrating axially into an arc blast nozzle (13), which it then blocks and which defines an arc expansion volume (14) around a wear contact (12) which is complementary to the conductive termination and carried axially by the first conductive member of the semi-moving assembly, as well as said nozzle which is fixed to the end of said first conductive member at a border of the expansion volume, for filling with gas through a wall (17) which separates said expansion volume from a compression chamber (15) formed in the first conductive member between said wall and a compressor piston (19) moved with the semi-moving and moving assemblies; and a drive rod (21) disposed axially in the semi-moving assembly and movable in translation between a fully inserted position in which the first conductive member and the second conductive member of the semi-moving and moving assemblies are interconnected and a fully open position in which the first conductive member and the second conductive member of the semi-moving and moving assemblies are separated, the drive rod carrying the first conductive member (6) of the semi-moving assembly and co-operating with a first linkage (22 to 30) through which said second conductive member (5) of the moving assembly is driven, said first linkage for causing, when the drive rod is pulled from its fully inserted position, an initial displacement of the semi-moving and moving assemblies in the same direction as the rod, followed by movement of the moving assembly in the opposite direction to the semi-moving assembly, after said moving assembly has stopped and until the drive rod reaches its open position, after separation of the first conductive member and the second conductive member, and wherein said drive rod co-operates with a second linkage (31 to 36) which drives a compressor piston in the opposite direction relative to said first conductive member (6), on which it slides, until the first conductive member and the second conductive member are separated.