C ₅ F ₁₀ O gas mixture is a SF ₆ potential substitute with high insulation strength and is a new type of environmentally friendly insulating gas. By adding oxygen to C ₅ F ₁₀ O gas mixture, insulation strength can be improved and carbon deposition can be suppressed.

Sulfur hexafluoride (SF6) is widely used in high-voltage gas insulation equipment, but SF6 has a strong greenhouse effect, with the “peak carbon dioxide emissions and carbon neutrality” goal proposed, its harmless degradation treatment has become an urgent problem in the power industry. In this article, it is proposed that SF6 degradation under $\text{H}_{{2}}$ synergy is based on pulsed dielectric barrier discharge (DBD) plasma technology. The results show that $\text{H}_{{2}}$ can significantly promote the degradation of SF6 and improve its destruction and removal efficiency (DRE). Among them, as the $\text{H}_{{2}}$ concentration increased gradually from 0.2% to 2%, the DRE of SF6 gradually increase. The complete removal of SF6 was achieved by adding 2% $\text{H}_{{2}}$ at a flow rate of 50 mL/min of 2% SF6 gas mixture and a power input of 55 W. The detection and analysis of SF6 discharge degradation products showed that the main products were SO2, SOF2, SO2F2, SiF4, and OF2. The addition of $\text{H}_{{2}}$ will inhibit the formation of S–O–F gas products, and promote the formation of SO2 and S elements. With the increase of $\text{H}_{{2}}$ concentration, the rate of S element generation gradually accelerated, and the selectivity of SO2 in gas decomposition products reached more than 50% when $\text{H}_{{2}}$ concentration was high. The results of this study provide a direction for the efficient degradation and product regulation of SF6.

C₆F₁₂O (heptafluoroisopropyl pentafluoroethyl ketone) has been considered as a potential eco-friendly gas insulating medium to replace SF₆, the most potent greenhouse gas, used in medium-voltage equipment. In this paper, we explored the compatibility between the C₆F₁₂O-air gas mixture and metals such as copper and aluminum to evaluate the long-term behavior of the new gas. Aging tests for the C₆F₁₂O-air gas mixture and metal were conducted, and the composition as well as the microstructure was analyzed. It was found that the interaction between C₆F₁₂O-air and copper results in the decomposition of C₆F₁₂O and corrosion of copper. Several by-products including CO₂, C₃F₆, C₄F₈O, and C₆F₁₂ can be detected. Obvious color modifications and corrosion points exist after interaction. The compatibility between C₆F₁₂O-air and aluminum is superior to that between C₆F₁₂O-air and copper. Their interaction did not lead to the corrosion of aluminum. As for engineering applications, anticorrosion measures should be taken on copper to avoid the occurrence of negative chemical interactions.

SF₆ is a strong greenhouse effect gas, which is widely used in high-voltage electrical equipment such as circuit breakers and high-voltage switchgear because of its excellent insulation performance and arc extinguishing ability. In recent years, the use and emission of SF₆ have been rising, and with the proposal of the dual carbon strategic goal, its harmless degradation has become an urgent problem to be solved. In this paper, SF₆ was degraded by pulsed DBD plasma technology and O₂. Studies have shown that the addition of O₂ can effectively promote the degradation of SF₆. With the increase in the added O₂ content, the DRE and EY of SF₆ first increased and then decreased. Under the conditions of the input power of 50 W, SF₆ concentration of 2%, and gas flow rate of 50 mL/min, the reaction system obtained the highest DRE and EY of 58.40% and 5.24 g/kWh when the O₂ content was 1%, respectively. In the SF₆/Ar/O₂/H₂O system, the addition of H₂O could improve the product selectivity of SO₂F₂, and when the O₂ concentration was 1%, the highest selectivity of SO₂F₂ was 48.96%, and the concentration was 8006.76 ppm. The addition of O₂ inhibited the production of SO₂, and with the addition of the O₂ system, SO₂F₂ and SOF₄ were the main components of degradation products; however, there were also SOF₂, SO₂, SiF_4, SF₄, etc. In this paper, the decomposition path of O₂ under SF₆ was analyzed in detail according to infrared spectroscopy and decomposition products.

SF6 is a greenhouse gas widely used in the power industry that cannot be directly emitted. This study employs a self-designed two-stage dielectric barrier discharge (DBD) plasma series method that was used to degrade SF6 gas and analyzes the effect of H2O concentration. The results indicate that the SF6 degradation rate (DR) initially increased and then decreased with the rise in the water vapor content. When the added H2O concentration increased from 0.5 to 1.5%, the degradation rate of SF6 increased from 89.49 to 100%, achieving complete degradation of SF6. However, when the H2O concentration further increases to 2.5%, the degradation rate of SF6 decreased to 92.83%. The energy efficiency of SF6 degradation in the primary reaction system first increased and then decreased with the increase of H2O concentration, while that of SF6 in the secondary reaction system first decreased and then increased. It was found that the products of SF6 were SO2F2, SO2, SOF2, and SOF4. The addition of H2O increased the selectivity of SO2 in the decomposition products to 75.17%, and inhibit the formation of SO2F2 and SOF2. This study provides experimental support for the degradation of SF6 waste gas and provides a research direction for its industrial application.