A Novel Framework to Study the Role of Ground and Fumed Silica Fillers in Suppressing DC Erosion of Silicone Rubber Outdoor Insulation

Abstract

This paper investigates the effect of ground and fumed silica fillers on suppressing DC erosion in silicone rubber. Fumed silica and ground silica fillers are incorporated in silicone rubber at different loading levels and comparatively analyzed in this study. Outcomes of the +DC inclined plane tracking erosion test indicate a better erosion performance for the fumed silica filled composite despite having a lower thermal conductivity compared to the ground silica composite. Results of the simultaneous thermogravimetric and thermal differential analyses are correlated with inclined plane tracking erosion test outcomes suggesting that fumed silica suppresses depolymerization and promotes radical based crosslinking in silicone rubber. This finding is evident as higher residue is obtained with the fumed silica filler despite being filled at a significantly lower loading level compared to ground silica. The surface residue morphology obtained, and the roughness determined for the tested samples of the composites in the dry-arc resistance test indicate the formation of a coherent residue with the fumed silica filled composite. Such coherent residue could act as a barrier to shield the unaffected material underneath the damaged surface during dry-band arcing, thereby preventing progressive erosion. The outcomes of this study suggest a significant role for fumed silica promoting more interactions with silicone rubber to suppress DC erosion compared to ground silica fillers.

Controlling of Fumed Silica Particle Size Uniform Production Process Based on Burner Fluid Dynamic Simulation

“…Fumed silica, as one of the most vital high-tech nanomaterials with a small particle size, large specific surface area, porous structure, and a variety of unique physical and chemical properties, has been widely used in medicine, silicone rubber, − cosmetics, pesticides, fertilizers, and other applications. In 2019, the consumption of fumed silica in the silicone rubber industry accounted for more than 58% of the total consumption.…”

Outdoor Insulation and Gas-Insulated Switchgears

“…The next three articles [47][48][49] focus on aspects of synthetic insulation materials, either specifically silicone rubber insulation housing composites' modification by suitable fillers or more generally with a review on polymeric insulation applications.…”

“…Alqudsi et al [48] experimentally investigated the effect of ground and fumed silica fillers (incorporated at different loading levels) on suppressing DC+ erosion in silicone rubber. To evaluate the erosion performance of the composites, the inclined plan test (IPT) under DC+ voltage was used.…”