Self-Healing Silicones for Outdoor High Voltage Insulation: Mechanism, Applications and Measurements

Fadi Z. Kamand, Basharat Mehmood, Refat Ghunem, Mohammad K. Hassan, Ayman El-Hag, Leena Al-Sulaiti and Ahmed Abdala
Additional contact information
Fadi Z. Kamand: Center for Advanced Materials, Qatar University, Doha P.O. Box 2713, Qatar
Basharat Mehmood: Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
Refat Ghunem: NRC Metrology Research Center, National Research Council Canada, Ottawa, ON K1A 0R6, Canada
Mohammad K. Hassan: Center for Advanced Materials, Qatar University, Doha P.O. Box 2713, Qatar
Ayman El-Hag: Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
Leena Al-Sulaiti: Center for Advanced Materials, Qatar University, Doha P.O. Box 2713, Qatar
Ahmed Abdala: Chemical Engineering Program, Texas A&M University at Qatar, Doha P.O. Box 23874, Qatar

Energies, 2022, vol. 15, issue 5, 1-17

Abstract: This paper discusses the state of the art in the application of self-healing silicone-based materials for outdoor high-voltage insulation. Both the dynamic behavior of the dimethyl side groups of silicone rubber and the diffusion of a bulk siloxane to maintain low surface energy are respectively reported as intrinsic mechanisms responsible for the self-healing of silicone rubber. Localization, temporality, mobility, and the type of synthesis are the aspects defining the efficiency of the self-healing ability of silicone rubber. In addition, the deterioration of the self-healing ability with filler loaded into silicone rubber insulation housing composites is discussed. Taking the self-healing property into consideration among the other properties of silicone rubber insulators, such as tracking and erosion resistance, can be a useful design practice at the material development stage. Hydrophobicity retention, recovery, and transfer measurements are discussed as useful indicators of the self-healing ability of silicone rubber. Nevertheless, there remains a need to standardize them as design tests at the material development stage. The paper is intended to shed the light on the hydrophobicity recovery, a key material design parameter in the development of silicone rubber outdoor insulating composites, similar to the tracking and erosion resistance.

Keywords: self-healing; silicone rubber; fillers; outdoor insulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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