The Role of Sulfur Hexafluoride SF6 Gas In Transformers - Knowledge

sulfur hexafluoride SF6 gas

Sulfur hexafluoride (SF6) is a colorless in-noxious and non-flammable gas at atmospheric temperature. It is chemical stable with good insulation. Sulfur hexafluoride (SF6) is an inorganic, colorless, odorless, non-flammable, extremely potent greenhouse gas, which is an excellent electrical insulator. SF6 has an octahedral geometry, consisting of six fluorine atoms attached to a central sulfur atom.

Purity:99.99%~99.999%

CAS No.:2551-62-4

Grade Standard:Electron Grade, Industrial Grade

This article will introduce the main role of sulfur hexafluoride in transformers

Improve insulation performance

Sulfur hexafluoride SF 6 gas has excellent insulation performance and its insulation strength is about 2.5 times that of air. In transformers, sulphur hexafluoride can effectively improve the insulation performance of equipment and avoid short-circuit accidents caused by damage to insulators.

Protecting the working stability of the transformer

Gas sulfur hexafluoride has high chemical stability and can effectively prevent the formation of oxide layer, corrosion layer and pollution layer inside the transformer, thereby protecting the working stability of the transformer. The effect of SF6 gas is more significant in harsh environments such as high humidity, high temperature and high pressure.

Prevent oxidation, contamination, short circuit and other faults

The metal parts inside the transformer are very susceptible to oxidation reactions, which leads to the degradation of insulation performance, and frequent contamination and short circuit faults. Adding gas sulfur hexafluoride can effectively prevent these faults, keep the inside of the transformer clean, dry and stable, and extend the service life of the transformer.

Arc extinguishing ability

Hexafluoride gas is a highly electronegative gas, and its molecules can easily absorb free electrons to form negative ions with large mass. Its arc extinguishing ability is about 100 times that of air. In high-voltage circuit breakers, it is used as an arc extinguishing medium to quickly extinguish arcs, prevent accidents from expanding, and protect the safety of power systems.

In addition to being used in transformers, Sulfur hexafluoride SF6 gas is one of the most commonly used fluoride gases in semiconductor dry etching. It is characterized by high selectivity and strong etching rate. It is suitable for etching of low dielectric constant materials such as silicon oxide, silicon fluoride, silicon nitride, etc.

During the etching process, sulfur hexafluoride will undergo a fluorination reaction with the polymer chains in the photoresist, causing their molecular chains to gradually break, thereby producing an etching effect.

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