With the development of electric power industry,sulfur hexafluoride gas has been widely used in electrical equipment because of its excellent insulation performance and arc extinguishing performance,and the operation of the gas switch device has also been rapidly developed.But the leakage of sulfur hexafluoride switch will not only affect the normal operation of the equipment,but also bring physical and life harm to the maintenance personnel.

　　Due to the colorless and odorless physical characteristics of this gas,it is also easy to be found leakage by maintenance personnel.This problem has been faced in the development of sulfur hexafluoride gas switches.In this paper,the gas leakage in sulfur hexafluoride switch device and how to timely and truly discover SF6 leakage and how to effectively solve.

　　In recent years,with the continuous development of society,economy and switching technology,the complexity of engineering construction increases,switch equipment miniaturization,maintenance free,intelligent products are more and more favored.Sulfur hexafluoride gas has good insulating properties,and is widely used in high-voltage switchgear at present.Under normal working conditions,sulfur hexafluoride gas is an ideal dielectric for insulation and arc extinguishing.Although SF6 switch with better insulation advantage to become a high voltage switch in the bright.

　　Once the switch leaks,the sulfur hexafluoride gas insulation performance inside the switch will be greatly reduced,and the arc will be generated inside the switch,which will cause great damage to the switch and the connecting equipment.The same gas causes serious environmental pollution to the air.

　　And high purity sulfur hexafluoride decomposing under high pressure and high temperature,decomposing into hydrogen fluoride,sulfur dioxide,sulfur tetrafluoride,hydrogen sulfide and other toxic substances will lead to acute edema of lung tissue,affect oxygen exchange in the lungs,leading to anoxia and asphyxia death.Therefore,it is urgent to find and solve the problem of SF6 leakage in time.