The category of SF6 switching equipment is an integration of electrical and mechanical equipment,which use SF6 gas as insulation medium and interrupter electric arc media,and it is also an important control and protection of the electrical equipment in power system.

The thermal-fluid coupled finite element model with the structure of sulphur hexafluoride transformer’s directed-gas duct was built based on the fundamental theories of heat transfer and fluid dynamics.

The factors influencing the relationship with environmental temperature and moisture content in sulfur hexafluoride gas;

Application and environment protection issues of sulfur hexafluoride circuit breaker

Reviews the physical and chemical properties of sulfur hexafluoride,contrasts the basic methods of sulfur hexafluoride made,compares sulfur hexafluoride product standard(GB 12022―89) with the abroad's,explains sulfur hexafluoride(SF_6) have the extensive useness and the development foregrounds.

This paper reviewed the methods of gravimetric for sulphur hexafluoride calibration gases and purity analysis and uncertainty combination,at the same time,we obtain the combination is dates of uncertainty based on ISO-6142 and GB / T 5274-1985.

This paper reviewed the methods of gravimetric for sulphur hexafluoride calibration cases and purity analysis and uncertainty combination,at the same time, we obtain the combination is dates of uncertainty based on ISO—6142 and GB/T5274—1985.