Compatibility between C6F12O–N2 Gas Mixture and Metal Used in Medium-Voltage Switchgears

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.

Review on decomposition characteristics of eco-friendly gas insulating medium for high voltage gas insulated equipment

“…It was found that corrosion of the copper surface gradually deepened as the interface temperature increased from 80 • C to 250 • C, while the aluminum surface remained stable. C 3 F 6 and C 3 F 7 H were produced during the interaction and the metal oxide crystal particles were precipitated on the copper surface [143] Severe corrosion also occurred on the copper surface [144,145].…”

Stability Valorization of Hydrofluoroolefine HFO-1336mzzE and Its Mixtures under Arc Discharge Conditions

“…C 2 F 6 exhibits a very high GWP of 9,200 CO 2 eq over 100 years, 16 as well as a remarkable atmospheric lifetime of 10,000 years, 15 as discussed at the beginning of this paper (Table 1). CF 4 and C 2 F 4 are considered two of the most harmful PFCs, due to their long lifetime.…”

“…5 Recent studies of HFO4E have shown a similar stability to SF 6 , presenting itself as an eco-friendly alternative to replace the already limited use of SF 6 in GIE. 24 In some of these studies, the 0.78−0.79 16 10,000 15 9,200 16 76-16-4 C 3 F 8 0.96−0.97 16 2,600 16 7,000 16 76-19-7 c-C 4 F 8 1.25−1.31 16 3,200 16 8,700 16 115-25-3 C 4 F 7 N 2.74 16 35 16 2,700 behavior of HFO4E mixed with CO 2 has also been analyzed, where a positive synergistic effect between both gases has been obtained, in addition to a less sensitive behavior toward electrical field heterogeneity (at HFO4E contents higher than 15%) 25 compared to SF 6 . However, while seeking similarity with the insulation performance of SF 6 , important aspects such as the stability of the HFO4E mixture under different conditions of use, as discussed in this study, should not be neglected.…”

First Principles Calculation of Compatibility between Environmentally Friendly Insulating Gas C5F10O and CuW Contacts

“…Zhu et al . tested the compatibility of C 6 F 12 O‐N 2 mixed gas with Al and Cu at different temperatures, and found that with the increase in temperature, the corrosion degree of the copper surface deepened, promoting the decomposition of C 6 F 12 O, and the compatibility of the gas mixture with Al was greater than that of Cu [14]. Reference [15] analyzed the gas–solid compatibility relationship between environmentally friendly insulation medium C4F7N and metal copper and aluminum through density functional theory, and demonstrated the accuracy of the simulation through temperature rise experiments.…”