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Sulphur Hexafluoride (SF6)


SF6 is a gas which is used throughout the electricity industry as an insulating medium in switchgear. It provides many tangible benefits, however it is a potent greenhouse gas with a high global warming potential (GWP).

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NGED continues to work with manufacturers in the development of SF₆ alternatives to ensure equipment meets operational safety requirements in the UK. Where an existing SF₆ asset replacement is required we replace with a lower SF₆ volume unit, lowering the overall SF₆ bank.

Over the last 12 months we have engaged with all major developers of SF₆ free apparatus (Siemens/Schneider/Hitachi/Lucy).

NGED have offered to sponsor a number of non SF₆ products through the ENA Notice of Conformity process (NoC) which aids those manufacturers selling their devices to any UK DNO and potentially others who also follow the UK ENATs and British Standard technical specifications.

We have also continued with our installation of non SF₆ 145kV Live Tank Circuit Breakers and now have four active units with a fifth ready for installation at Feeder Road BSP in Bristol. We have orders either placed or planned for at least 30 units over the coming months as we move away from our internal trial to normal use.