1. Physical and chemical properties of SF6 gas
Pure SF6 gas is colorless, odorless, odorless, non-flammable, chemically stable at room temperature, and is an inert gas. However, in the power industry, sulphur hexafluoride gas (SF6) is widely used as an insulation and arc extinguishing medium in high-voltage switches. During the operations of circuit breakers and GIS, due to arcing, corona, spark discharge and under the influence of partial discharge, high temperature and other factors, SF6 gas will decompose, and its decomposition products will become corrosive electrolytes when they encounter moisture. Especially some highly toxic decomposition products. Such as SF4, S2F2, S2F10 SOF2, HF and S02, they will irritate the skin, eyes, mucous membranes, if there is amount of inhalation, it can cause dizziness and pulmonary edema, and even death.
2. The danger of leakage in the SF6 switchgear
The indoor space in which the SF6 high-voltage equipment is installed is generally tightly sealed. Once the SF6 gas leaks, the air circulation is extremely slow, and the toxic decomposition products are deposited indoors, which is difficult to discharge, which poses a great danger to the workers entering the SF6 switch room. Because the specific gravity of SF6 gas is larger than that of oxygen. When SF6 gas leaks, SF6 gas will accumulate in the low-level space, causing local anoxic. Make people suffocate. On the other hand, since the SF6 gas itself is colorless and odorless, it is not easy to detect after the leakage, which increases the potential danger to the workers entering the leak site and seriously threatens the safety and health of the personnel. Even caused a vicious accident.
3. Safe concentration of SF6 gas
According to research by chemical protection scientists in the United States and the former Soviet Union, the results show that in the presence of pure SF6 gas, the skin is exposed to SF6 gas for 8 hours, and the highest SF6 gas content that can be withstood is 1000*10ˉ6 (1000ppm). At this concentration, there is no danger or long-term impact on human health. China's "State Grid Corporation Power Safety Work Regulations" quotes the results of this study, 1000 * 10 ˉ 6 is a safety police line that allows SF6 gas in the SF6 switch room. Above this concentration, the monitoring alarm device should automatically start the fan and alarm.
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