An electric flashover is one of the most serious and lesser understood electrical hazards. It is a continuous electric discharge that flows through an air gap between conductors which generates a very bright light as well as immense heat. Flashovers, in turn, are subjected to several factors – such as high voltages, direct or low impedance, high temperatures, etc.
To avoid leakage currents, discharges, and pollution flashovers, a silicone layer is applied to the insulator surface by using a special spray coating technique. The silicone layer provides a hydrophobic surface that combats the negative effects of contamination and enhances the electrical characteristics of the insulator in highly polluted areas.
To avoid leakage currents, discharges, and pollution flashovers, a silicone layer is applied to the insulator surface by using a special spray coating technique. The silicone layer provides a hydrophobic surface that combats the negative effects of contamination and enhances the electrical characteristics of the insulator in highly polluted areas.
Benefits of RTV Silicone High Voltage Insulator Coating
- MAINTENANCE COSTS – Complete elimination of washing/cleaning of Insulators even under Class IV pollution levels
- GRID ECONOMICS – Supresses the leakage current and reduce the direct losses due to the leakage current and corona discharges
- VERSATILE – Suitable for both new and existing insulators and can be applied on all type of Insulators (Porcelain Disc, Porcelain Long Rod, Glass Disc, Composite/Polymer)
- LONG LASTING – The RTV Coating is unaffected by the tropical climate, extreme weather conditions, UV and all major Chemicals to offer a longest service life of more than 25 years.
- EASY APPLICATION – The RTV Coating can be applied on in-situ conditions and there is no need for dismantling of the equipment including the gantry insulator strings
- ENVIRONMENTALLY FRIENDLY – The Coating is a Non-Toxic and VOC Compliant
- TECHNOLOGY & LIFE – It offers the best of both worlds, (i.e.) The Mechanical Strength of Porcelain Insulators and the Hydrophobicity of Composite (Polymer) Insulators with life of more than 25 years
How does the RTV Silicone Coating work?
- The accumulation of contaminants on the insulator (due to industrial pollution, urban pollution and salt vapour) when combines with the water filming (due to dew, fog & light rain) results in discharges, dry band arcing and eventual flash over.
- The RTV Silicone High Voltage Insulator Coating imparts an Ultra Hydrphobic Surface on Insulator and prevents wetting of contaminants
- The diffusion of Low Molecular Weight Silicones (LMWS) to the surface of the insulator encapsulates the contaminants and neutralizes them throughout the service life
- The arc resistance filler (Alumina Tri Hydrate or ATH) suppresses the heat during dry band arcing and prevents degradation of the coating.
Download Technical Note
Please download the Technical note of the RTV Silicone High Voltage Insulator Coating.