Optimization design of GIL insulation spacer based on finite element analysis

In gas-insulated metal-enclosed transmission lines (GIL), spacers experience surface charge accumulation phenomena when subjected to DC voltage, leading to electric field distortion and spacer flashover under lightning impulse voltage. Therefore, this paper proposes a design approach for dual-purpose bowl spacers capable of suppressing charge accumulation under DC voltage, based on finite element analysis-optimized spacer bowl shape design. Results show that optimized surface electric field strength decreases by 32.5% compared with the non-optimized level.