Although the conventional gas is stable in nature, the insulation strength is less than 40% of SF6, and it can replace SF6 as an insulating medium in some medium and low voltage equipment. Sulfur hexafluoride gas mixture can fundamentally meet the insulation requirements of the equipment and reduce the liquefaction temperature, which is suitable for high-cold areas, but it cannot completely prevent the use of sulfur hexafluoride, and cannot fundamentally solve the problem of greenhouse effect. The liquefaction temperature of electronegative gas is generally higher, so the mixed buffer gas is needed.

In recent years, C4F7N, C5F10O and C6F12O and other new insulation gas insulation function, discharge and overheating differentiation characteristics, differentiated product safety and micro-water and micro-oxygen and other key influencing factors on its mechanism to carry out in-depth research, began to put forward suitable for different application scenarios of alternative gas program, The new type of gas insulation and solid data compatibility are discussed.

The single use of the existing substitute gas will have limitations. The future use of insulating gas may adopt the way of multiple mixing and gas solid combination. Although some achievements and engineering practice have been made in the insulation function instead of gas, no great breakthrough has been made in arc extinguishing ability.