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Application characteristics of SF6 in power industry

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1. SF6 is an artificial inert gas with molecular weight of 146. It has good electrical insulation performance and excellent arc extinguishing performance. Its electrical strength is 2.5 times of that of nitrogen under the same pressure, the breakdown voltage is 2.5 times of that of air, and the arc extinguishing capacity is 100 times of that of air. It is a new generation of ultra-high voltage insulating dielectric material superior to that between air and oil. It is widely used in high and medium voltage power equipment.

2. SF6 is pure and non-toxic, but the products produced may be mixed with toxic gases, which may also produce toxic gases under the action of high-temperature arc.

3. SF6 is a greenhouse gas, which is one of the six greenhouse gases prohibited by the Kyoto Protocol to the United Nations Framework Convention on climate change, which was enacted in December 1999 (entered into force on February 16, 2005).

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