Abstract

Medium- and high-voltage gas-insulated switchgear (GIS) play a vital role in the infrastructure of electrical power transmission and distribution systems. The equipment within these substations is primarily insulated with pressurized gas to ensure optimal operational performance. Solid insulation is also used in switchgears in the form of shafts, spacers or dielectric barriers. The aim of this work is to investigate the influence of dielectric barriers on the breakdown voltage in pressurized ai rinsulated rod-plane gaps. A design of experiments is used to optimize the number of experiments and create a model for the estimation of the breakdown. A Box–Behnken Design (BBD) was used to produce an empirical formula of the breakdown voltage as a function of multiple parameters. The investigated parameters considered in the BBD are the barrier location in the gap space, the barrier dimensions, the absolute pressure and the electric field non-uniformity factor. The obtained results indicated that the barrier effect was most significant in the arrangement with strongly non-uniform field for 1.5 bar and led to an increase of breakdown voltages.

Luan Caizergues, Ayyoub Zouaghi, Caterina Toigo, Alain Girodet and Christian Vollaire

Presented at CEIDP 2025

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