Silicone rubber (SiR), as a basic insulating material, is widely used in insulators for HVDC
transmission lines. In these lines, corona discharge even occurs on well-designed hardware
and insulators, which can inject charge into the insulator surface. The existence of surface
charge has a marked effect on insulation degradation and plays an important role during the
development of the surface flashover. Direct-fluorination is a method to change the chemical
component, which could induce the corresponding changes in electrical properties of the …

Room temperature vulcanized (RTV) silicone rubber (SiR) is a kind of basic insulating
material and is widely used to coat porcelain and glass high voltage insulators. In HVDC
transmission lines, electric corona could take place even on well-designed hardware and
insulators, which could make charge accumulate on the surface of insulators and inject into
the surface. However, with the disadvantage of organic polymer, its corona-resistance
property is not good enough, which makes insulation early degradation occur frequently …