Abstract：SF6 is a kind of excellent insulation and arc extinguishing medium. It is widely used in cabinet type gas insulated metal closed switchgear. But it is a greenhouse effect gas, and it will produce poisonous gas in arc extinguishing. It is necessary to develop and use environment-friendly gas as an alternative gas for SF6. In the field of medium voltage switchgear, vacuum interruption technology and environment-friendly gas insulation technology have been mature. In this paper, N2, CO2, dry air and other alternative gases are compared. The results show that N2 and dry air can be used as insulation medium in the medium pressure field 12kV environment friendly inflatable cabinet. At the same time, it introduces the isolation fracture distance of the environmental protection inflatable cabinet, and how to improve the breakdown voltage in the air gap.
2019, Vol. 20 
