1. Application of silicone rubber in the field of composite insulators
At present, the outer insulation materials of power transmission and transformation equipment mainly include ceramics, EPDM rubber, epoxy resin and silicone rubber. Because silicone rubber has outstanding advantages in crack resistance, water repellency, antifouling, tracking resistance and electrical corrosion resistance, it has gradually replaced other materials and become the preferred insulating material for composite insulator preparation. Recent studies have found that the addition of a small amount of siloxane oligomers can impart stable and long-lasting hydrophobic mobility to silicone rubber composite insulators. When used in combination with siloxane oligomers of different polymerization degrees, silicone rubber has better properties. In addition to the migration of hydrophobic water, the hydrophobicity and aging resistance of drowning water are also greatly improved, and the hydrophobic migration of the sample after aging for 2500 h and 5000 h has not changed significantly.

2. Application of silicone rubber in the field of cable accessories
The various terminal heads and intermediate connectors in the cable line are collectively referred to as cable accessories. Cable accessories are necessary to connect cables and equipment for power transfer. The application of silicone rubber in cable accessories has experienced three stages of heat shrinkage, prefabrication and cold shrinkage. Currently, commercially available silicone rubber cable accessories are basically cold-shrinkable. Silicone rubber for separable shielded cable accessories of 10~35 kV wire net not only has high insulation resistance, but also has no loss of elasticity after continuous use for more than 20 years at -50 ~ 180 °C, and also has good thermal conductivity. Waterborne and excellent mechanical properties. Thermal aging characteristics are an important factor in the operational reliability of silicone rubber for ultra high voltage cable accessories.

3. Application of silicone rubber in the field of anti-fouling flash coating
The increase of environmental pollution will reduce the insulation of the transmission and transformation lines, which will easily lead to pollution flashover accidents and serious losses. One of the current measures to prevent soil flash is to coat RTV silicone rubber coatings. However, RTV silicone rubber coatings have been subjected to wind, sun, rain, discharge ablation and other corrosion during the long-term use, and cracks, flaking, electric erosion, and drowning performance may occur. Sparkling due to failure. In order to further improve the performance of RTV silicone rubber coatings, a lot of researches have been carried out on the properties and influencing factors of silicone rubber for anti-fouling coatings. It is found that the higher the silica content, the higher the thermal conductivity of the silicone rubber, the stronger the electric tracking resistance and the arc ablation resistance; by adding the nano-scale fumed silica to the formulation and the composite resistance of the inorganic and organic materials. The fuel can significantly improve the water repellency, oil resistance, flame retardancy and self-cleaning properties of the coating. The addition of fluorine atoms makes the coating have a low surface energy, and the adhesion of ice on the surface is small, and it can fall off under the action of natural force, and plays a role of preventing ice coating.
With the deepening of research and the continuous improvement of product performance, silicone rubber will be used more and more in the power industry, especially in the fields of composite insulators, cold-shrinkable cable accessories, transformers, transformers, anti-fouling coatings, etc. .

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