Abstract

In this paper the investigation of breakdown characteristics liquefied SF6 (LSF6) in model GIS (gas insulated switchgear) were described. The ability of LSF6 insulation is higher than high-pressurized SF6 gas. The breakdown characteristics of LSF6 were produced by bubble formed evaporation of LSF6 and bubble caused by high electric emission and corona. Also, The property of dielectric breakdown is determined by electrode form, electrode arrangement, bubble formation and movement, arc extinguishing capacity of media, difficulty in corona formation, and the distance between electrodes. The bubble formation and flow separation phenomenon were identified for LSF6. It is considered in this paper that the results are fundamental data for electric insulation design of a high-temperature superconductor and cryogenic equipments machinery which will be studied and developed in the future.

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