With medium-voltage switchgear, progress is being made with regard to finding alternatives to SF6 as an insulation gas. Designs that incorporate dry air or a mixture of fluoroketone, nitrogen and oxygen as the insulating gas are being explored to minimize environmental impact. Oil, vacuum and CO2 are other alternatives to SF6.
Regardless of the type of insulation, it is important that all individual components used within the switchgear assembly can withstand harsh environments, temperature extremes and regular submersion in water. Among these components are the hermetic feedthroughs carry conductor wires in and out of the gas-insulated cavity.
Already a dominant choice for switchgear applications, epoxy-based hermetic feedthroughs are poised to become even more popular as a variety of SF6 alternatives come into play.
Read our latest white paper for more detailed look at how various switchgear insulation gases affect feedthrough performance.