In the power industry, SF6 is an important medium. It is used as the arc extinguishing and marginal gas for enclosed, high-voltage switches. The superior performance of sulfur hexafluoride gas realizes the economical and low-maintenance operation of the device. At present, as the edge and arc extinguishing medium, there is no other technology that can surpass SF6 gas from the technical, economic and ecological point of view.
Sulfur hexafluoride gas has been widely used in electrical equipment. From the application point of view, SF6 circuit breakers and GIS are important domains, which have basically replaced oil circuit breakers with voltages of 126kV and above. Obviously, it is an inevitable trend of development that SF6 gas replaces the edge oil as the arc extinguishing and edge medium.
With the in-depth and extensive application of internal SF6 electrical equipment, the amount of sulfur hexafluoride gas is increasing. Because SF6 gas is expensive, and when SF6 gas contains moisture, it will cause the following hazards to electrical equipment:
(1) In the presence of moisture, SF6 decomposition products undergo a hydrolysis reaction, which hinders the recombination of SF6 decomposition products, reduces the recovery strength of SF6 media, and thereby reduces the feasibility of the equipment;
(2) Intensified hydrolysis of low fluoride and decomposition of metal fluoride. The generated fluorinated sulfurous acid and hydrofluoric acid are highly toxic, have great harm to the human body, and also corrode electrical and related materials;
(3) Condensation of sulfur hexafluoride gas in the equipment. Because the moisture in the gas exists in the form of water vapor, when the temperature drops, it may condense inside the equipment and adhere to the surface of the equipment such as electricity and edge surfaces. It is easy to produce creeping discharge (flashover) and cause accidents.
Sulfur hexafluoride manufacturers remind that once the fluorinated sulfurous acid and hydrofluoric acid in high-purity sulfur hexafluoride are put into the atmosphere, they will pollute the environment.
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