Glass insulators have been found to have the following advantages over porcelain insulators in the first few years of production and operation:

Due to the high mechanical strength of the glass insulator's surface, it is less prone to cracking. The electrical strength of glass typically remains constant throughout its operation, and its aging process is much slower than that of porcelain. Therefore, glass insulators are mainly retired due to self-destruction, which occurs within the first year of operation, whereas the defects in porcelain insulators are only discovered after several years of use.

Glass insulators can eliminate the need for regular preventive tests of the insulators during operation. This is because any damage to the tempered glass will result in the destruction of the insulator, which is easily detectable by maintenance personnel during their rounds. When the insulator is damaged, glass fragments near the steel cap and iron foot are caught, and the remaining mechanical strength of the insulator is sufficient to prevent the insulator string from breaking off.