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In this paper, we carried out a case study on fundamental insulation design for the application of N2/SF6 gas mixtures to 275kV gas-insulated bulbar. Firstly, we investigated the impulse ratio in N2/SF6 gas mixtures and pointed out that the insulation design might be based on the negative switching impulse voltage in the case of lower SF6 content. Secondly, we estimated the tank diameter and SFs gas amount with consideration of the electric field strength on conductor surface and temperature rise in gas mixtures. We clarified that the tank diameter at the lower SFs content is mainly determined by the electric field strength on the conductor surface and quantified the optimum gas pressure and SF6 content for a target reduction of SFs gas amount.

Fundamental Study on Electrical Insulation Design of N<sub>2</sub>/SF<sub>6</sub> Gas Insulated Electric Power Apparatus