The Effect Of Umbrella Skirt Sheath On Insulators

The umbrella-shaped sheath covers the exterior of tension insulator, forming an additional barrier. By extending the surface creepage distance, this structure alters the surface shape and electrical path of dead end insulators, resulting in a more uniform surface electric field. When the silicone rubber umbrella skirt is bonded to the surface of dead end suspension insulators, the creepage distance is effectively extended, significantly improving performance in pollution and rain/fog environments.

The umbrella-shaped sheath also improves the material properties of the surface of polymer deadend insulator. Compared to bare porcelain, the use of high-temperature vulcanized silicone rubber provides higher hydrophobicity and better electrical stability. In high-humidity and high-pollution environments, the external insulation of porcelain dead end insulators relies on surface insulation capability; in this case, the moisture-proof and dirt-proof properties provided by the umbrella-shaped sheath play a crucial role in maintaining system stability.

Under rain, fog, or pollution conditions, exposed suspension insulator is prone to leakage or flashover due to surface contamination and water film formation. The umbrella-shaped structure of the umbrella-shaped sheath, with its overall coverage, reduces water film adhesion and contamination accumulation. The multi-layered umbrella design (including combinations of large, medium, and small umbrellas) ensures that even if the surface is damp or contaminated, the overall distance along the surface and the structural shielding are maintained, effectively reducing the risk of rain flash and surface arcing.