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Composite insulators are able to withstand rain and wind. They also have excellent self-cleaning capabilities under rain and wind. Composite insulators are lighter because the core rod is stronger and has a higher extension strength. Composite insulators weigh only 10-20% compared to porcelain insulator strings in the same voltage class. Their length can be reduced by 10-20% in the same voltage class.
The composite insulator's sheds are smaller than those of porcelain insulator string. This means that the minimum electric arc distance for composite insulators is lower than for porcelain insulator string strings of the same length. Also, the lightning resist level for composite insulators is lower than for strings of the same length. There is no effect on their insulation property. Attention must be paid to erosion at both ends of the fitting. Composite insulators are in the puncture-proof group, which means that it is not subject to zero value insulators detection, which greatly reduces maintenance tasks.
Composite insulators' sheaths and sheds are made of silicone rubber. The surface is low-energy. Composite insulators have a longer creepage distance and a smaller diameter umbrella shed. The surface also has hydrophobicity, hydrophobicity, and hydrophobicity migration. Composite insulators' shed surface will not form a continuous water film even in humid or polluted environments. Silicone rubber is made by linking high-molecular polymers of organic oxygen compounds and polydimethyl siloxane; the main chain is formed through a silicon oxygen bonds. Silicon oxygen bonds have a higher bond energy, which makes them more thermostable and can be used at temperatures between -100 and +350 degrees Celsius. Silicon rubber is resistant to ozone. However, butadiene-propylene butadiene rubber may be easily broken at room temperature with ozone tension of 150ppm. Silicon rubber, however, can last several months without being broken.