Sulfur Hexafluoride (SF6) gas is largely used as a dielectric and insulating material in the transmission and distribution equipment.
SF6 has demonstrated its effectiveness as dielectric material to insulate both high and medium voltage components enabling compact dimensions and footprint reduction.
Furthermore, SF6 properties include:
- Good dielectric strength
- Nontoxic, nonflammable, noncorrosive
- Chemically stable
- Excellent arc extinguishing
- Good thermal conductivity
These properties have allowed SF6 to replace oil and air insulation as the preferred interrupting medium increasing reliability in operation.
Unfortunately, SF6 is also an extremely potent greenhouse gas with a GWP approximately 24,000 times that of CO2.