Glass Insulator

Glass insulators, in the initial years of production and operation, have been found to have the following series of advantages over porcelain insulators:

Due to the high mechanical strength of the glass insulator surface, it is less prone to cracking. The electrical strength of glass generally remains constant throughout its operation, and its aging process is much slower than porcelain. Therefore, glass insulators are primarily retired due to self-damage, occurring within one year of operation, whereas defects in porcelain insulators are only discovered after several years of operation.

Utilizing glass insulators, the need for periodic preventive tests with live voltage during operation can be eliminated. This is because any damage to the tempered glass will result in the destruction of the insulator, which is easily detectable during routine inspections. When an insulator is damaged, glass fragments near the steel cap and iron foot get caught, and the remaining mechanical strength of the insulator is sufficient to prevent the insulator string from breaking off. The self-breakage rate of glass insulators is an important indicator of product quality and serves as a quality criterion for bidding and tendering in transmission projects.