Triple-umbrella Type Glass Insulator

Triple-umbrella type glass insulator is the high-end subcategory of anti-
pollution glass insulators. It adopts a progressive design with three layers of
umbrella skirts, featuring an extremely high creepage ratio and excellent anti-
pollution flashover capability. It is specifically developed for extremely
harsh transmission scenarios such as severe pollution, high salt spray, and
repeated icing. It is the core insulating component for 750kV and 1000kV ultra-
high voltage lines.
Core structure and design features
The three-layer umbrella skirt gradient configuration adopts a design of large
umbrella + medium umbrella + small umbrella, with the largest diameter of the
upper layer umbrella and the widest outward angle, which can effectively shield
the middle and lower layers of umbrella skirts, blocking most of the dust, salt
spray, condensation, etc. of pollution; the middle layer umbrella skirt takes
on the protection of the large umbrella, further dispersing wind pressure and
icing loads; the lower layer small umbrella is compactly arranged, maximizing
the extension of the creepage path. The edges of all umbrella skirts are
rounded and treated with anti-electrode discharge, reducing corona loss and
radio interference, and improving the self-cleaning efficiency when washed by
rainwater, reducing the residue of pollution.

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