Siemens and the South Korean manufacturer Iljin Electric have teamed up to develop an SF6-free gas-insulated switchgear (GIS)for the 170 kilovolt (kV) level, building on a similar Siemens application for up to 145 kV. The new GIS will use treated air, known as "Clean Air", instead of sulfur hexafluoride (SF6) as the insulating medium.
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