S. Ohtsuka, M. Onomoto, T. Nishimura, S. Matsumoto, M. Shibuya, and M. Hikita (Japan)
CO2 gas, partial discharge, breakdown, metallic particle motion, GIS
This paper describes insulation properties of CO2 gas where a metallic particle exists in CO2 gas-insulated apparatus. CO2 gas is a predominant candidate for the SF6 substitute gas because of its relatively good dielectric strength and arc conductance compared with other environmentally-benign gases such as N2, O2, H2, He and those gas mixtures. When CO2 gas is used as insulation media for gas-insulated apparatus like gas-insulated switchgear (GIS), influence of a mingling particle on insulation properties has to be clarified. From this point of view, we investigated not only partial discharge inception and breakdown voltages of the model spacer adhered with a metallic particle in CO2 gas, but also motion behavior and PD properties of a free moving particle by varying CO2 gas pressure up to 0.6 MPa under ac voltage application.
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