Abstract
SF6 gas has been widely used in the gas-insulated switchgear (GIS) as an insulation gaseous media because of its excellent insulation and arc-quenching performances. However, SF6 gas has the global warming potential (GWP). In view of reducing the environmental impact, researches on the SF6 alternatives have been carried out. Non-SF6 gases or gas mixtures using natural-origin gases and fluorinated gases are highlighted as new SF6 alternatives, and their dielectric and arc-quenching performances as well as the EHS (Environment Health Safety) aspects are examined. The authors have focused on the natural-origin gases such as CO2, dry Air and N2 for their very low GWP, and investigated not only their insulation performance like partial discharge (PD) inception and breakdown voltages, but also the PD-emitted electromagnetic (EM) wave properties for insulation diagnostics, under the same electrode systems along with SF6.
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