Shuncheng sulfur hexafluoride is a colorless, odorless, non-toxic, inert gas with a density heavier than air, and it is also one of the six greenhouse gases currently discovered. Gas is widely used in the high-voltage electrical appliance manufacturing industry. Pure sulfur hexafluoride gas is a non-toxic and harmless asphyxiating gas. There is no such thing as a poisonous sulfur hexafluoride gas.
However, the impure Shuncheng sulfur hexafluoride is very harmful to the environment, human body and equipment. Especially when the sulfur hexafluoride gas contains excessive moisture, it may be decomposed into toxic gases such as HF, SO2, SOF2, etc. under the action of the high-voltage arc, which will have a great impact on the surrounding people and things. So, how serious is the water hazard of sulfur hexafluoride gas? Where does the harm of sulfur hexafluoride gas moisture come from?
Why do we value the water hazards of Shuncheng's sulfur hexafluoride so much? What we have to understand first is that the chemical nature of sulfur hexafluoride (SF6) gas is very stable, it does not burn in the air, does not support combustion, does not react with water, strong alkali, ammonia, hydrochloric acid, sulfuric acid, etc., pure high-purity hexafluoride Sulfur gas is very safe and harmless when there is no suffocation condition. However, due to insufficient gas extraction technology or insufficient storage of steel cylinders, or SF6 gas that has been recycled for a long time, it is inevitable that there will be a certain amount of water in the SF6 gas. A small amount of moisture is not a threat, but when the moisture content exceeds the standard, the moisture of sulfur hexafluoride gas is very harmful!
Shuncheng's sulfur hexafluoride water exceeding the standard will cause harm, affect arc extinguishing, and produce toxic substances. When the water content of the circuit breaker is high, it is easy to condense on the surface of the edge material, causing the edge to drop, and flashover breakdown occurs in severe cases. Gas with high water content is decomposed under the action of electric arc, sulfur hexafluoride gas and water produce a variety of hydrolysis reactions, resulting in powdery margins such as tungsten trioxide and copper fluoride. Among them, copper fluoride has strong hygroscopicity. Attached to the surface of the edge, it reduces the flashover voltage along the surface. Hydrofluoric acid and sulfurous acid are highly corrosive, corrosive to solid organic materials and metals, and shorten the life of the equipment.
In addition, the harm of sulfur hexafluoride gas moisture is not only for equipment, in fact, excessive moisture can cause SF6 gas and toxic decomposition products generated under the action of high-temperature arc to be discharged into the atmosphere, harming the body and harming the environment.
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