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silicon composite insulator

Silicon composite insulator formation:
Traditionally ceramic insulators of porcelain are used in both transmission and distribution lines.
Now polymer or silicon composite insulator is increasingly used in high voltage transmission systems. The silicon composite insulator has a fibre rod surrounded by outer sheath of some polymer. Due to the hydrophobic nature of the composite insulator surface, dry areas are formed between wet areas resulting in discontinuities in wet creepage path. This phenomenon helps improve the performance of the silicon composite insulator in polluted and coastal areas. The polymer insulators have one great advantage that it is quite lighter in comparison to porcelain insulators. It is reported that the silicon composite insulator surface degrade faster in comparison to porcelain insulator.

silicon composite insulator               composite insulator post

Silicon composite insulator advantage:
One important disadvantage with porcelain insulator is that the porcelain insulators can bear large compressive force but less tensional force. The porcelain insulators surface is hydrophilic in nature, which means affinity for water. Silicon composite insulators age faster than ceramic insulators.

For example, as one main type of silicon composite insulator, the composite insulator post is mostly used in high and extra high voltage substations. In the substation Post type insulators are used for supporting equipments and Bus conductors.


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