Application of solid insulated materials on medium voltage switchgear of distribution lines

For medium voltage and high voltage class, SF6 gases are widely used for insulating materials for most of the switchgears at distribution lines because of its superior electrical insulating quality. However, this SF6 gas belongs to one of 6 greenhouse gases which have to be reduced each year by complying with the Kyoto´s protocol signed in 1997. So many researches are made by power equipment companies for the purpose of finding out appropriate alternative material for SF6 gas. Recently, epoxy is proved to be a high insulation reliability and eco-friendly used on electrical equipments. This paper introduces a kind of epoxy molded Solid Insulated Switchgear (SIS) for medium voltage class.