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US 4,458,121 AGranted
DC Circuit breaker
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsSatoru Yanabu, Tohoru Tamagawa, Eiji Kaneko, Takumi Funahashi
Life of this patent
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Abstract
A DC circuit breaker of the type using a blown arc-extinguishing gas is disclosed which allows for reliable fast interruption of DC currents through the provision of arc extension current paths. The extension current paths are relatively long and are bent after the incidence of the arc-extinguishing gas on the arc. The arc is formed to extend for a long distance in a loop configuration. An auxiliary electrode short-circuits the extended arc with one auxiliary electrode being provided for each extension current path.
Claims9
A DC circuit breaker comprising:
- a fixed electrode and movable electrode that can be moved towards each other or separated from each other;
- means for discharging arc-extinguishing gas when the said two electrodes are separated from each other;
- and
- means for extinguishing the arc which receives the said arc-extinguishing gas and blows it onto the arc which is formed between the two electrodes, wherein said arc-extinguishing means comprises an oscillation circuit that is connected in parallel with the two electrodes;
- an arc-extinguishing block which is provided with a through-hole for the fixed electrode arranged between the said two electrodes, through which the fixed electrode can pass to approach or move away from the movable electrode;
- a blast flow path to guide the arc-extinguishing gas to blow onto the said arc;
- a plurality of arc extension flow paths opening onto the said through-hole for the fixed electrode whereby the arc-extinguishing gas is exhausted;
- and wherein at least one auxiliary electrode is mounted in the regions where the said arc extension flow paths respectively open into the through-hole for the fixed electrode.
5 more elements
Dependencies are inferred from the claim text.