The analysis about the fault of the current transformers (CT) installed in the 220 kV substation of Gaobazhou hydropower plant and the repairing measures for them, the characters of SF 6 current transformer and the details of check test in installation site are described.

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.