Development Prospect of Gas Insulation Based on Environmental Protection

The research situation of environmentally friendly gas insulation is expounded in this paper. The basic physical and chemical properties of the insulating gases are analysed, to propose several environment-friendly insulating gas of potential alternative to sulphur hexafluoride (SF 6 ). The insulation characteristics of different components gas mixtures with 90% of nitrogen (N 2 ) and carbon dioxide (CO 2 ) as buffer gas and 10% octafluorocyclobutane (c-C 4 F 8 ), Trifluoroiodomethane (CF 3 I) and heptafluorobutyronitrile (C 4 F 7 N) as the main insulating gas had been tested with 5–20 mm sphere-plane electrode gaps in non-uniform electric field under the power frequency voltage and positive and negative lightning impulse breakdown. The development prospects of environmentally friendly gas insulation are forecasted. Further analysis of c-C 4 F 8 ,CF 3 I and C 4 F 7 N (some friendly gases, which have the potential to replace SF 6 ) are conducted trying to points out the further research direction.

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