Abstract
This paper discusses the lessons learned about fillers that are added to silicone rubber insulation housing composites, in order to improve the erosion resistance against the dry-band arcing are presented and common perceptions. Common practices that employ alumina tri-hydrate are reviewed, including the additional influential effect of the water of hydration in the suppression of the dry-band arcing. The effect of the water of hydration is shown to be dependent on various factors, such as the hydrated filler level and the type of the hydrated filler. More recent paradigms in which hydrated fillers have not been employed are also reviewed. Volume and shield actions of fillers are essential aspects that need to be understood in the design of silicone rubber insulation housing composites for new applications such as HVDC. In addition, the thermal degradation mechanisms of silicone rubber and the corresponding suppression effects of the added fillers are summarized.
Highlights
Silicone rubber insulators are replacing the conventional ceramic insulators due to their proven performance when exposed to environmental pollutants
Fillers are added to silicone rubber outdoor insulation housing composites in order to enhance the erosion resistance, but the primary purpose of using fillers is cost reduction achieved by replacing the expensive silicone with the filler particles
This paper summarizes the evolution of in dry-conditions, silicone rubber without hydrated fillers have shown acceptable tracking the design paradigms in the development of erosion-resistant silicone rubber insulation housing composites by shedding light on the common perceptions about the application of inorganic fillers
Summary
Silicone rubber insulators are replacing the conventional ceramic insulators due to their proven performance when exposed to environmental pollutants. Fillers are added to silicone rubber outdoor insulation housing composites in order to enhance the erosion resistance, but the primary purpose of using fillers is cost reduction achieved by replacing the expensive silicone with the filler particles. Cost reductions have been a great incentive for loading silicone rubber outdoor insulation composites with as much filler as possible. This approach reduces the amount of the LMW siloxane responsible for recovering the hydrophobicity of silicone rubber [1]. The application of fillers in silicone rubber outdoor insulator composites is usually based experience, which has been so far successful as demonstrated by decades of
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