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Introduction of high voltage insulator

The function of high voltage insulator is to insulate the electrically charged part of equipment or machine from another charged part or uncharged metal part.

In the high voltage overhead transmission and distribution power line in order that transmission towers or poles support the lines, high voltage insulators are used to insulate the live conductor from the transmission towers. The high voltage insulators used in transmission and distribution system are also required to carry large tensional or compressive load.

According to material the HV/EHV insulators are divided into two types: ceramic insulator and polymer (composite) insulator

 

                     Composite high voltage insulator                                                           Porcelain insulator

 

Traditionally porcelain insulators are used in both transmission and distribution lines.

Nowadays composite high voltage insulators are increasingly used in high voltage transmission systems. The composite high voltage insulators have a fiberglass rod surrounded by silicone rubber. 

Due to the hydrophobic nature of the composite high voltage insulators surface, dry areas are formed between wet areas resulting in discontinuities in wet creepage path. This phenomenon helps improve the performance of the high voltage insulators in polluted and coastal areas. The high voltage insulators have another great advantage that it is quite lighter in comparison to porcelain insulators. 

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. 

Orient group can provide the two kinds of insulators. Customers could purchase insulators according their situation.