Due to the serious greenhouse effect of SF

6

eco-friendly insulating gases represented by CF

3

I

C

4

F

7

N

C

5

F

10

Oand other gases have attracted more and more attention.The surface insulation characteristic is an important index to evaluate the electrical performance of the gas-solid composite insulation system

but the current research on new eco-friendly gases is not complete.In order to promote the development and application of new eco-friendly gases

this article reviews the research progress of several popular SF

6

alternative gases on the interface insulation properties.From three aspects

such as th

e gap breakdown characteristics and surface insulation characteristics

gas-solid interface charge accumulation characteristics

and the influence of gas decomposition and gas-solid compatibility on the surface insulation characteristics

the possibility of SF

6

alternative gases for engineering applications is discussed.Finally

three directions for the investigation of SF

6

alternative gases on the interface insulation characteristics are proposed as follows:first

the influence of frequency on creeping discharge in new eco-friendly gases should be focused on;second

the effect of charge accumulation on creeping insulation under long-term electric-thermal-mechanical compound stress in new eco-friendly gases should be investigated;third

the design of the new eco-friendly gas-solid composite insulation system should be optimized based on the influence mechanism of gas decomposition characteristics and gas-solid compatibility on the surface insulation performance.