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

Due to the high mechanical strength of the glass insulator 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 porcelain. Therefore, glass insulators are mainly retired due to self-damage, which occurs within the first year of operation, whereas defects in porcelain insulators are only discovered after several years of operation.

Glass insulators eliminate the need for regular preventive tests on energized 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 an insulator is damaged, glass fragments near the steel cap and iron foot are trapped, 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 bid evaluation in transmission engineering projects.