Abstract
Sulfur hexafluoride (SF6) is widely used in the power industry because of its excellent insulation and arc extinguishing performance. However, the high greenhouse effect of this material is being restricted by many countries around the world, thereby discouraging its usage. As a potential alternative to SF6, the compatibility of C5F10O with conductive copper materials used in electrical equipment is of great significance in ensuring the safe and stable operation of environmentally friendly gas-insulated equipment. In this paper, the interaction among C5F10O/N2, C5F10O/air gas mixture, and copper was studied via experiments and simulations. When the C5F10O/N2 (or air) gas mixture comes in contact with copper at the gas–solid interface, a small portion of C5F10O is decomposed to form C3F6 (or C3F6 and C3F6O) at high temperatures. Meanwhile, at low temperatures (120 °C), the C5F10O/air gas mixture becomes more compatible with copper than with the C5F10O/N2 gas mixture. When the experiment temperatures range between 170 °C and 220 °C, the compatibility of the C5F10O/air gas mixture with copper is significantly inferior to its compatibility with copper. Under high temperatures, the C5F10O/air gas mixture shows severe corrosion on the copper surface due to the presence of O2, forms a thick cubic grain, and emits irritating gases. The simulations show that the carbonyl group in C5F10O is chemically active and can be easily adsorbed on the copper surface. An anti-corrosion treatment must be performed on copper materials in manufacturing equipment. The findings provide an important reference for the application of C5F10O gas mixture.
Highlights
Introduction in published maps and institutionalSince its application in medium- and high-voltage gas-insulated switchgears (GIS)in the 1930s [1], sulfur hexafluoride (SF6 ) has been favored by the power industry for its excellent insulation and arc extinguishing performance
A gas–solid compatibility experiment platform was designed to investigate the compatibility of C5 F10 O/N2, C5 F10 O/air gas mixture, and copper materials when aging at different temperatures [19]
In the presence of metallic copper, certain chemical reactions may lead to the decomposition of C5 F10 O, and these reaction products can be analyzed by gas chromatography mass spectrometer (GC–MS)
Summary
Since its application in medium- and high-voltage gas-insulated switchgears (GIS). in the 1930s [1], sulfur hexafluoride (SF6 ) has been favored by the power industry for its excellent insulation and arc extinguishing performance. By increasing the total pressure of the C5 F10 O gas mixture, the electrical insulation strength can reach the equivalent insulation level of SF6 [12]. Studies have investigated the insulation properties and arc extinguishing characteristics of the C5 F10 O gas mixture, only few have examined the compatibility of this gas mixture with metal materials. The compatibility of the C5 F10 O gas mixture with metal materials at different temperatures is of great significance in extending the service life and ensuring the safe and stable operation of equipment. A gas–solid compatibility experiment platform was designed to investigate the compatibility of C5 F10 O/N2 , C5 F10 O/air gas mixture, and copper materials when aging at different temperatures [19]. The related findings provide a reference for the engineering application of C5 F10 O gas mixture instead of SF6
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