Fabrication of GIS Spacer Model with ε-FGM (Functionally Graded Materials) and Theoretical Estimation of its Breakdown Voltage in SF₆ Gas

Abstract

For the relaxation and optimization of electric field distribution around Gas insulated switchgear (GIS) spacers, the application of functionally graded materials (FGM) with spatial distribution of dielectric permittivity (ε) can be one of the effective solutions. In this paper, we fabricated the coaxial disk-type ε-FGM using SrTiO₃/SiO₂ particles by the centrifugal force method. We also proposed the coaxial cone-type ε-FGM by the flexible mixture casting method and evaluated its electric field reduction effect and breakdown voltage in SF₆ gas by the volume-time theory.