How can Composite Insulator enhance their anti-pollution flashover performance in adverse weather conditions through multi-layer umbrella skirts

Under humid weather conditions such as fog, rain and melting ice, the dirt layer on the surface of power line insulators is prone to moisture absorption and the formation of conductive channels, which can cause dangerous pollution flashover accidents. Therefore, the Composite Insulator can adopt a multi-layer umbrella skirt design with alternating sizes, which can effectively enhance its anti-pollution flashover capability. The key mechanisms are as follows:
Increasing creepage distance: Multi-layer umbrella skirts significantly increase the actual leakage distance on the insulator surface, that is, the creepage distance. This makes the voltage required for the current to form a complete flashover channel along the surface higher, raising the flashover threshold.

It improves surface dryness and has a shielding effect: The larger upper layer of the umbrella skirt acts like an "umbrella", shielding part of the lower part of the umbrella skirt and reducing its area directly exposed to rain and fog.

Promoting drying: The air gap formed between the umbrella skirt facilitates air circulation, accelerating the evaporation of moisture on the surface of the umbrella skirt and helping to maintain the relative dryness of the local area of the insulator.

Block the continuous wet dirt layer:
The complex umbrella skirt structure divides the insulator surface into multiple areas. Even if part of the surface of the umbrella skirt gets damp and forms a local conductive layer, the dry area or air gap adjacent to the umbrella skirt can effectively block the continuous penetration of these wet and dirty layers, preventing the formation of a low-resistance channel that runs through the entire insulator.

Therefore, the Composite Insulator prevents flashover through a multi-layer umbrella skirt design. The core is to physically extend the leakage path, reduce the moisture-exposed area of the key area, and use structural division to prevent the continuity of the wet and dirty layer. This design can significantly enhance the electrical insulation strength of insulators in damp and polluted environments, effectively suppress the occurrence of pollution flashover accidents, and ensure the safe operation of the power grid.