电缆与附件界面涂敷料的性能可靠性及选型方法研究

During the installation of cable accessories, coating silicone grease played a good role in lubrication and sealing, but the swelling characteristics of silicone grease on the rubber insulation of accessories greatly affected the long-term reliability of the interface of cable accessories. At present, there are many kinds of silicone grease, accessories manufacturers use different, and there is no standard for the selection of coated silicone grease. In this paper, nine kinds of coating silicone greases commonly used in accessories installation were selected. Firstly, three kinds of silicone greases with excellent anti-swelling properties were screened by weight gain test of silicone rubber. Then, the electrical, mechanical, moisture resistance and corona aging resistance of these three silicone resins were further studied. The results showed that for dimethyl silicone, high viscosity and introduction of phenyl side group could reduce the swelling of silicone rubber and improve the mechanical properties of silicone rubber. Compared with dimethyl silicone grease, perfluoropolyether grease has more excellent swelling resistance, chemical inertness and excellent thermal stability. Silicone rubber coated with such grease can maintain excellent mechanical properties under different aging methods. However, the high polarity silicone grease coating under DC makes the interface space charge accumulation of silicone rubber and crosslinked polyethylene more, so this kind of silicone grease is not suitable for the interface coating of DC cable accessories; in wet environment, the dielectric constant of silicone rubber coated with inorganic-doped silicone resin changes greatly, making this silicone resin not suitable for the moisture condition of accessories.