Sulfur hexafluoride gas is a colorless,tasteless,non-toxic,with good insulation gas.Sulfur hexafluoride equipment is widely used in power transmission systems due to its high insulation strength,excellent arc extinguishing performance,cooling characteristics,nonflammability and thermal stability.Sulfur hexafluoride,however,is a greenhouse gas that could contribute to global warming.

　　Sulfur hexafluoride gas as industrial production gas,is an excellent power equipment insulation gas,but as one of the six greenhouse gases,it is calculated that sulfur hexafluoride gas damage to the ozone layer is 23900 times carbon dioxide,and the atmospheric sulfur hexafluoride gas life of up to 3400 years,can cause long-term damage to the ozone layer.

　　With the promotion of new technology and the application of new equipment and new materials,sulfur hexafluoride equipment has been widely used in the power system with its advantages of safety and reliability,easy maintenance and long service life,and plays an important role in the safe,economic and stable operation of the power system.

　　Today,the world emits about 21 billion tons of carbon dioxide a year,and sulfur hexafluoride gas is released into the atmosphere each year equivalent to 125 million tons of carbon dioxide gas.Today,the world emits about 21 billion tons of carbon dioxide a year,and sulfur hexafluoride gas is released into the atmosphere each year equivalent to 125 million tons of carbon dioxide gas.

　　The use of high-purity sulphur hexafluoride gases and the search for safer alternatives will have to be reduced for a considerable time to come.Therefore,reducing sulfur hexafluoride emissions is one of the important means to build green power grid,promote clean development of power grid and control global warming.