National Grid, GE, 3M make power grid greener with gas-insulated switchgear
National Grid has commissioned the new green alternative at the Sellindge 400,000-volt substation in Kent
National Grid, working with GE Grid Solutions and 3M, has commissioned gas-insulated switchgear using an alternative to sulphur hexafluoride (SF6).
Used around the world for decades, SF6 is a powerful insulation gas that allows high voltage electricity switchgear to take up less space.
However, while leakage rates are extremely low, SF6 is also a potent greenhouse gas, 23,900 times worse for the environment than carbon dioxide.
The project uses 3M and GE Grid Solutions’ green gas for grid – or g3 – instead of SF6. This reduces the global warming potential of the gas used in National Grid equipment by 98 percent.