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US 5,155,315 AGranted
Hybrid medium voltage circuit breaker
AssigneeMerlin Gerin
InventorsPeter Malkin, Roger Bolongeat-Mobleu
Life of this patent
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Abstract
The circuit breaker comprises main contacts 26, 30 and a vacuum cartridge 38 in parallel which performs breaking, the assembly being contained in an enclosure 10 filled with sulphur hexafluoride. The cartridge is designed for dielectric withstand in this gas. The contacts of the cartridge 38 are made of high resistive material and a coil generates an axial magnetic field in the arcing zone.
Claims6
A medium voltage electrical circuit breaker comprising:
- a sealed enclosure (10) filled with sulfur hexafluoride;
- two main contacts (26, 30) disposed in said sealed enclosure (10);
- a vacuum cartridge (38) disposed in said sealed enclosure (10);
- a pair of arcing contacts (46, 48) disposed in said vacuum cartridge (38) and electrically connected and parallel to said main contacts (26, 30), said pair of arcing contacts (46, 48) being at least partially defined by disk-shaped contact parts (50) made of high resistive material;
- an operating mechanism mechanically connected to said main contacts (26, 30) to open said arcing contacts (46, 48) after said main contacts (26, 30) open, and to close said arcing contacts (46, 48) before said main contacts (26, 30) close;
- magnetic field generating means (70) for producing a magnetic field axially about said arcing contacts (46, 48) in said vacuum cartridge (38);
- and
- a cylindrical housing (40) at least partially defining said vacuum cartridge (38) and co-axially surrounding said arcing contacts (46, 48), wherein an axial length of said cylindrical housing (40) corresponds to a dielectric withstand of said cylindrical housing (40) in sulfur hexafluoride.
5 more elements
Dependencies are inferred from the claim text.