Research and Application of 110 kV C4-FN Mixtures Gas-insulated Switchgear (GIS)

Sulfur hexafluoride (SF6) gas is widely used in gas-insulated switchgear (GIS) because of its excellent properties for insulation. However, SF6 gas has a high global warming potential (GWP) value and has a negative impact on the environment. In order to reduce greenhouse gas emissions, SF6 gas is replaced by C4- FN mixtures. The material properties,and properties for insulation of C4- FN mixtures are analyzed, and the GWP value of C4-FN mixtures is much lower than that of SF6 gas,and the carbon emission of C4-FN mixtures high-voltage equipment is also lower than SF6, and it has excellent properties for insulation and arc interruption, C4-FN mixtures GIS has been applied in the 110kV interval expansion project of a 110kV substation in Shanghai, which verifies the reliability and environmental protection of the equipment, and fills the blank of the engineering application of C4-FN mixtures in high-voltage equipment in China.