400KV polymer strain insulator in silicone rubber has better sealing performance and no moisture ingress for the technology of its one-piece (HTV SIR) housing, FRP rod, connection zone and end fitting.

400KV polymer strain insulator in silicone rubber sealing technology:
The one-piece housing of the 3FL suspension insulators, i.e. weathersheds and core rod sheath (coating) is one-piece, and has only one internal interface throughout the whole 400KV polymer strain insulator in silicone rubber, namely the boundary interface between the housing and the FRP core rod.

This design eliminates all internal interfaces between weathersheds and the core rod coating of the composite suspension insulator. These kinds of longitudinal interfaces are normally very sensitive to tangential electrical field stress, which in worst case scenarios can easily lead to erosion damage of the polymer interfaces, in particular leading to erosion of the bonding between sheds and rod sheath, and thus damage to the 400KV polymer strain insulator housing.

Furthermore, the junction point in the 400KV polymer strain insulator in silicone rubber connection zone, where all three elements (FRP rod, metal end fitting, and silicone housing) meet each other, is absolutely water and airtight sealed during manufacturing by using an overmolding housing system. It totally encloses this junction point with the HTV silicone rubber of the housing itself. The highest bonding strength of the polymer suspension insulators one-piece HTV silicone housing to the FRP core rod combined with the overmolding design system prevent moisture ingress at the connection zone of the 400KV polymer strain insulator in silicone rubber.

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