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Technical Forum >> About Sulphur Hexaflouride,SF6                         AddTime:2009-7-25
      

About Sulphur Hexaflouride,SF6

SF6 is an artificial gas used in switchgear and installations,Sulphur hexaflouride is one of the strongest green house effect gas mentioned by the Kyoto protocol.It has a potential for global warming that is about 23 900 times bigger than carbon oxide, CO2.

Swithchgear manufacturer use SF6 gas in order to build secure, reliable and compact installation for companies in the generation,transmission and distribution power industry.SF6 is used as a insulation medium for high voltage swithgear and apparatus due to its great arc quenching characteristic. Discharges during manufacturing, installation, service and dismantling is a  bigger problem than actual leaks form already installed products.It is important for the suppliers of these types of products that the handling prevents discharges secures a good recycling policy.

SF6 is used in the electrical industry as a gaseous dielectric medium for high-voltage (35 kV and above) circuit breakers, switchgear, and other electrical equipment, often replacing oil filled circuit breakers (OCBs) that can contain harmful PCBs. SF6 gas under pressure is used as an insulator in gas insulated switchgear (GIS) because it has a much higher dielectric strength than air or dry nitrogen. This property makes it possible to significantly reduce the size of electrical gear. This makes GIS more suitable for certain purposes such as indoor placement, as opposed to air-insulated electrical gear, which takes up considerably more room. Gas-insulated electrical gear is also more resistant to the effects of pollution and climate, as well as being more reliable in long-term operation because of its controlled operating environment. Vacuum circuit breakers (VCBs) are displacing SF6 breakers in industry as they are safer and require less maintenance. Although most of the decomposition products tend to quickly re-form SF6, arcing or corona can produce disulfur decafluoride (S2F10), a highly toxic gas, with toxicity similar to phosgene. S2F10 was considered a potential chemical warfare agent in World War II because it does not produce lacrimation or skin irritation, thus providing little warning of exposure.

SF6 is also commonly encountered as a high voltage dielectric in the high voltage supplies of particle accelerators, such as Van de Graaff generators and Pelletrons and high voltage transmission electron microscopes.




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