Insulation Properties of High-pressure CO2 Gas Under Existence of a Particle

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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