SF6 is a widely used traditional insulating gas, which has serious greenhouse effect. Therefore, the concept of environmental friendly GIL/GIS equipment is proposed. SF6/N2 and C3F7CN/CO2 are promising alternatives to environmental friendly gas insulating media. The temperature rise during the operation of environmental friendly GIL equipment will affect the flow capacity and operation safety of the equipment. Because the internal structure of GIL is complex, the heating of different positions are different, resulting in the uneven distribution of temperature rise in GIL. It is an important aspect of engineering application to understand the uneven distribution of temperature rise in GIL. Aiming at the uneven temperature rise in the engineering application of GIL, the temperature rise of key positions in GIL under the conditions of SF6 gas, SF6/N2 gas mixture and C3F7CN/CO2 gas mixture is obtained by high current temperature rise experiment. At the same time, the temperature distribution in the middle of GIL conductor and the conductive spring are simulated and compared with the measured results. The experimental results show that the overall temperature rise effect of GIL decreases sequentially from the conductor to the shell. The highest temperature occurs at the position of the conductive spring. The temperature rises in the three gas environments reach 50.74°C, 56.49°C, and 60.77°C, respectively, while for the upper surface of the middle conductor, they are 50.21°C, 56.31°C, and 60.53°C, respectively.The results show that the temperature rise of GIL conductive spring is the highest, and the heat source change caused by different internal structure of GIL has a great influence on the calculation results. It hopes the research results of this paper can provide a reference for the further application of environmentally friendly alternative gases.

alternative gases on SF6,temperature rise distribution,GIL,C3F7CN/CO2 gas mixture