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Article

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

1
École de Technologie Supérieure, Montréal, QC H3C 1K3, Canada
2
Metrology Research Center, National Research Council Canada, Ottawa, ON K1A 0R6, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Pawel Rozga
Energies 2021, 14(12), 3449; https://doi.org/10.3390/en14123449
Received: 28 April 2021 / Revised: 30 May 2021 / Accepted: 7 June 2021 / Published: 10 June 2021
(This article belongs to the Special Issue Outdoor Insulation and Gas Insulated Switchgears)
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. View Full-Text
Keywords: HVDC outdoor insulators; silicone rubber; fumed silica; ground silica; dry-band arcing; erosion performance HVDC outdoor insulators; silicone rubber; fumed silica; ground silica; dry-band arcing; erosion performance
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MDPI and ACS Style

Alqudsi, A.Y.; Ghunem, R.A.; David, E. A Novel Framework to Study the Role of Ground and Fumed Silica Fillers in Suppressing DC Erosion of Silicone Rubber Outdoor Insulation. Energies 2021, 14, 3449. https://doi.org/10.3390/en14123449

AMA Style

Alqudsi AY, Ghunem RA, David E. A Novel Framework to Study the Role of Ground and Fumed Silica Fillers in Suppressing DC Erosion of Silicone Rubber Outdoor Insulation. Energies. 2021; 14(12):3449. https://doi.org/10.3390/en14123449

Chicago/Turabian Style

Alqudsi, Alhaytham Y.; Ghunem, Refat A.; David, Eric. 2021. "A Novel Framework to Study the Role of Ground and Fumed Silica Fillers in Suppressing DC Erosion of Silicone Rubber Outdoor Insulation" Energies 14, no. 12: 3449. https://doi.org/10.3390/en14123449

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