Gaseous Insulation for High-Voltage Apparatus

Estimating of sulfur hexafluoride gas emission from electric equipments

“…Sulfur hexafluoride (SF 6 ) is a colorless and non-flammable gas at atmospheric temperature with a molecular weight 146.06 and a density 6.139 g/l (20ºC). SF 6 has outstanding insulation and arc extinguishment properties, the insulation strength of SF 6 is three times of air under normal temperature and pressure.…”

“…SF 6 has outstanding insulation and arc extinguishment properties, the insulation strength of SF 6 is three times of air under normal temperature and pressure. Under an operating pressure at 0.6Mpa in high voltage devices, the breakdown voltage of SF 6 is 10 times over that of air under 0.1Mpa [1].…”

“…SF 6 is practical in insulation for its excellent chemical and thermal stability. It is known to be a kind of strong greenhouse gas (GHG) by Kyoto Protocol.…”

“…With a global warming potential (GWP) as large as 23,900 (p.u.) and an atmospheric life time as long as 3400 years [4][5], SF 6 is the most powerful GHG in the world. Therefore reduction and substitution of SF 6 gas usage need more attention.…”

“…Therefore reduction and substitution of SF 6 gas usage need more attention. In fact, the research of utilizing SF 6 in circuit breaker can be traced back to 1947 [6].…”