Gas-insulated switchgear without SF6


National Grid, working with GE Grid Solutions and 3M, has commissioned the world’s first 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 CO2. National Grid has commissioned the new green alternative at the Sellindge 400 000 V substation in Kent. The project uses 3M and GE Grid Solutions’ green gas for grid, known as g3, instead of SF6. This reduces the global warming potential of the gas used in the equipment by 98%.

Contact Jeanette Unsworth, National Grid,

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