Glass insulators, during the initial years of production and operation, have been found to possess a series of advantages over porcelain insulators:

Due to the high mechanical strength of the glass insulator surface, cracks are unlikely to occur. The electrical strength of glass generally remains constant throughout its operational life and its aging process is much slower than porcelain. Therefore, glass insulators are mainly retired due to self-damage, occurring within the first year of operation, whereas defects in porcelain insulators are only discovered after several years of operation.

Glass insulators can eliminate the need for regular preventive tests on the insulators during operation, as any damage to the tempered glass would immediately destroy the insulator, making it easily detectable during routine inspections. 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 quality indicator for product quality and a basis for quality evaluation in bidding and tendering for transmission projects.