High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Reexamination Certificate
2007-03-23
2010-10-19
Luebke, Renee S (Department: 2833)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Air-current blowout
C218S051000, C218S059000
Reexamination Certificate
active
07816618
ABSTRACT:
The invention secures superior performance by restraining carbon generation also when using as an arc extinguishing medium a gas comprising the element C and having a global warming potential lower than that of SF6gas. A fixed contact section and a movable contact section are arranged opposite each other inside a sealed container filled with an insulating gas. A fixed arc contact and a movable arc contact are provided in the fixed contact section and the movable contact section. The insulating gas is a mixed gas of a gas comprising the element C, as the main constituent, and other gases. The presence of O2gas in the mixed gas has the effect of restraining the amount of carbon generated. Adding H2to the mixed gas has the effect of enhancing arc extinguishing performance, compensating for the diminished performance derived from not using actively the thermal energy of the arc.
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Toshiyuki Uchii, Hiromichi Kawano, Tetsuya Nakamoto, Hitoshi Mizoguchi, “Fundamental Properties of CO2Gas as an Arc Quenching Medium and Thermal Interruption Performance of Full-scale GCB Model” IEEJ Transactions on Power and Energy, 2004, pp. 469-475, vol. 124, 3.
“Environmental Burden of SF6and Gas Insulation Mixtures / Alternatives to SF6,” IEEJ Technical Communications, May 2001, 841.
Fishman Marina
Foley & Lardner LLP
Kabushiki Kaisha Toshiba
Luebke Renee S
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