Abstract
C6F12O has been introduced as the potential alternative gas to SF6 because of its excellent insulation properties and great eco-friendly performance. Considering that C6F12O may react with the internal materials of switchgears in practical applications, its compatibility with metal materials must be tested to evaluate its long-term application possibilities. In this work, the compatibility of C6F12O–N2 gas mixtures with aluminum and copper was tested at different temperatures by setting up a heat-aging reaction platform between the gas and each metal. The metal surface morphology and gas composition before and after the reaction were compared and analyzed. The results show that the surface color of the copper sheet changed considerably, and the corrosion degree of the surface deepened with the increase of temperature. The decomposition of C6F12O was also promoted. In contrast, aluminum did not react severely with the gas mixture. The compatibility of the gas mixture with aluminum was generally better than that of copper.
Highlights
SF6 has been widely used in the power industry, especially in high-voltage (HV) and medium-voltage (MV) gas-insulated switchgears (GIS), since the early 1980s due to its excellent technical performance and small footprint [1,2]
The main reason for this phenomenon is that aluminum is more active and active and oxidized in air to form a dense Al2O3 protective film, which is extremely resistant to oxidized in air to form a dense Al2 O3 protective film, which is extremely resistant to corrosion corrosion and forms an effective protection of the internal aluminum
The reason why the material compatibility of the C6F12O–N2 gas mixtures with aluminum was better than with copper may be attributed to the difference in the activity of these two metal surfaces
Summary
SF6 has been widely used in the power industry, especially in high-voltage (HV) and medium-voltage (MV) gas-insulated switchgears (GIS), since the early 1980s due to its excellent technical performance and small footprint [1,2]. 80% of the global production of SF6 is used in HV and MV gas-insulated equipment [3,4]. SF6 has a high global warming potential (GWP) of 23,500 and a long atmospheric lifetime of 3200 years [5,6]. These characteristics indicate that the unrestricted emission of SF6 would cause great harm to the atmospheric environment. The use of SF6 should be urgently reduced or limited, and an environmental-friendly gas must be identified to replace SF6
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