Development of SF<formula formulatype="inline"><tex>$_{6}$</tex></formula>-Free 72.5 kV GIS


This paper describes the fundamental insulation characteristics of environmentally friendly gases; dry air, N<sub>2</sub> and N<sub>2</sub> O<sub>2</sub> mixed gas. Conventional gas insulated switchgear (GIS) generally uses SF<sub>6</sub> as against over 72.5 kV class. We have proposed GIS with a vacuum circuit breaker against from 72.5 kV class to 170 kV… (More)


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