40.5kV non SF6 C-GIS research

With the subscription of Kyoto Protocol and mind improvement of the environment protection, people is more and more worrying about SF₆ gas applications, and its application restriction will definitely becomes the developing tendency in electrical industry. In order to avoid use of SF₆ in 40.5kV C-GIS(Cubicle-Gas Insulated Switchgear), proposed a design method for gas gap and interface insulation improvement to replace SF₆ by low-pressure N₂ as the insulation gas on basis of less or non SF₆ experiments in the current medium voltage C-GIS. Developed a 40.5kV-1250A 3 phase in one tank C-GIS prototype filling low pressure N₂, which has the same advantages of less space occupation as SF₆ C-GIS, and validates the feasibility of this developing concept.