Abstract
SF6 is widely used in the industrial field due to its stable structure and excellent properties. It is mainly used in electrical insulation equipment. Due to the boiling point of SF6, its use in extremely cold regions has been limited. It is harmful to the health of practitioners due to the toxicity of decomposition products. The gas has limited its wider use because of its strong greenhouse effect. As a result, researchers and electrical equipment manufacturing companies around the world are gradually searching for new environmentally friendly gases and have conducted research and exploration on theory and experiment. In this paper, the current status and existing problems of SF6 are summarized. The research contents and research methods of SF6 alternative gas direction are reviewed from the aspects of insulation performance, interrupter performance, and decomposition performance. The existing research results of the natural gas, SF6 mixed gas, perfluorocarbons, and CnFmX gas are summarized, and the future development trend of alternative gas for SF6 in the electrical industry is proposed.
Highlights
In 1900, an artificial inert gas called sulfur hexafluoride (SF6) was synthesized by two French chemists, Moissan and Lebeau
The main evaluation indices of the insulation performance of gas-insulated media are shown in Table III, which may be helpful to evaluate the properties of new gases
The insulation performance is weaker than that of SF6, these gases are initially considered as gases for insulation due to the simple molecular structure, and theoretical studies started earlier
Summary
In 1900, an artificial inert gas called sulfur hexafluoride (SF6) was synthesized by two French chemists, Moissan and Lebeau. SF6 is composed of the most active elements in the halogen, fluorine (F) and sulfur (S) atoms. S and F atoms are linked with covalent bonds, as shown in Fig. 1.1 It has a stable chemical structure and strong insulation capacity, and the arc-extinguishing capacity of SF6 is 100 times that of the air, and the insulation capacity is 2.5 times that of the air. It is a new ultra-high voltage dielectric insulation gas, which is superior to air and oil. Due to the excellent insulation properties and arc extinguishing performance, it is used in electrical equipment as gasinsulation media, such as circuit breakers, high voltage transformers, gas sealed combination capacitors, high voltage transmission lines, and transformers
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