Abstract
Pure air could be a true environment-friendly substitute for SF6, while keeping the same proven technologies and benefits of a hermetically encapsulated gas insulated switchgear (GIS). Given its environmental impact, SF6 should be replaced. Thanks to vacuum interrupter technology in medium voltage (MV) applications, SF6 is no longer necessarily needed to break load current or short circuit currents. For a modern MV GIS with vacuum technology, the gas mainly provides dielectric insulation and acts as a cooling medium for convective heat transfer. Both, electric insulation and cooling capabilities of a gas, depend on its density. When going from SF6 to pure air, there is a reduction factor of 5 in density. Specific heat and thermal conductivity, however, are higher in pure air while radiation is not impacted at all and external cooling of the switchgear is virtually the same as for the SF6 GIS. It is therefore easily enough possible to achieve similar performances with pure air as with SF6 for both, electric insulation and cooling, by design modification and pressure increase while keeping the same dimensions.
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