What are the main factors in the decomposition of SF6 gas?- SF6在线监测系统_SF6检漏仪_SF6传感器_SF6密度继电器

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What are the main factors in the decomposition of SF6 gas?

发布时间：2016-09-30 来源：ydlcb 浏览次数：34次

1) Decomposition under the action of electric arc;

2) Decomposition under corona, spark and partial discharge;

3) Catalytic decomposition at high temperatures.

Pure SF6 gas is colorless, tasteless, non-toxic, non-flammable inert gas, its own decomposition temperature is greater than 500 ° C, in the normal operation of the decomposition products are very few, but when co-existing with metal materials, at 200 ° C it is possible to occur trace decomposition. As the insulating medium of gas-insulated combined electrical apparatus (GIS), sulfur hexafluoride (SF6) gas has excellent insulation and arc extinguishing performance, and can greatly reduce the size of equipment, so it is widely used in GIS and SF6 circuit breakers and other equipment.

A certain amount of air and water, due to the decomposition of a variety of low fluorine sulfide is very active, that is, react with trace water and oxygen in SF6 gas. Due to the combination of SF6 decomposition and water, HF, H2S, CO, SO2 and other compounds have a strong corrosion effect on other insulation and metal materials in the equipment, and then accelerate insulation deterioration, and eventually lead to sudden equipment failure. However, during the installation and operation of GIS equipment, the internal defects of GIS, such as electrode surface burrs, free conductive particles and suspended conductors, cause partial discharge or overheating.