1. Characteristics of SF6 gas 2. Safety protection details for personnel operating, testing and repairing sulfur hexafluoride electrical equipment DL/T 639-1997 3. Safe operation of SF6 circuit breakers and GIS combination electrical appliances 4. Management of SF6 gas in electrical equipment 1. Characteristics of SF6 gas SF6 has a short history of use. Although this gas was discovered as early as the beginning of this century, it was used in electrical appliances in the 1950s. After the 1970s, it was used in large quantities and developed into fully enclosed combination electrical appliances, becoming the most important variety of ultra-high voltage power circuit breakers. Since 1900, when French chemists H. Moissan and P. Lebeau burned sulfur in fluorine gas in the laboratory to prepare sulfur hexafluoride (SF6) gas, people have benefited greatly from it. Due to the chemical stability of pure SF6 gas, it was used for artificial pneumothorax to treat tuberculosis cavities in the early days; at the same time, it has also attracted much attention due to its excellent insulation and arc extinguishing properties. Since 1940, it has been widely used as an insulating medium in power equipment, such as high-voltage circuit breakers, transformers, mutual inductance, capacitors, lightning arresters, contactors, fuses, pipeline mothers, etc. With the increase in the use of SF6 gas and the expansion of its scope, the correct use and management of SF6 gas and the protection of the environment and personal safety on which we depend have been put on the important agenda.
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