Insulator pollution

Insulator pollution is very common in life. If the material weathers poorly or the electrical stress is too high, the polymer could prematurely degrade and lead to a shortened service life.


The long term electrical performance of a polymer insulator is contingent upon the weatherability of the polymer material and the level of electrical stress subjected to the material.
The weathering of the material is a natural event caused by many factors, some of which are; wind, rain, heat, cold, humidity, pollutants from factories and automobiles, and ultraviolet rays from the sun. A polymer material's ability to endure these conditions for an extended period is dependent upon its chemical composition.
Hydrophobicity is the characteristic of silicone rubber that sets it apart from other commonly used insulator materials. Since silicone rubber does not readily wet-out, leakage current remains low and flashover are prevented. Even when the insulator pollution are heavily, silicone has the unique ability to impart hydrophobicity to the contaminated layer due to the migration of low molecular weight silicone polymer molecules into the contaminate.
A good way to avoid Insulator pollution is choose good material. Contamination flashover performance of silicone is far superior to other insulation materials, and because the contamination layer is hydrophobic, power washing of silicone insulators is not required.

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