In response to the trend of global warming,the use and control of SF6 gas with strong greenhouse effect is becoming more and more strict,the development and application of environmentally friendly gas insulation equipment is an important technical direction for the realization of the"double carbon"goal of power system.In recent years,environmental protection power equipment represented by perfluoroisobutyronitrile(C4F7N)gas insulated 420 kV gas insulated switchgear(GIS)equipment and perfluoropentacarbon(C5F10O)gas insulated 24 kV ring network cabinet has been applied in many countries,which promoted the green and low-carbon transformation of power equipment manufacturing industry.This paper mainly focuses on C4F7N and C5F10O,two kinds of environmentally friendly alternative gases with application prospects at present,the latest research progress of molecular design technology,microscopic parameters,insulation performance and decomposition stability,arc extinguishing performance,equipment material compatibility,engineering application and other aspects of environmentally friendly insulating gases are reviewed.The future engineering application technology route selection and technical research direction are prospected,in order to provide some reference for the research and development and application of green power equipment in China.
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