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 generally 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 a year of operation, whereas defects in porcelain insulators are only discovered after several years of operation.

Glass insulators eliminate the need for periodic preventive tests with live components during operation. This is because any damage to the tempered glass will break the insulator, making it easily noticeable by maintenance personnel during their rounds. When the 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. The self-breakage rate of glass insulators is an important quality indicator for product quality and serves as a quality criterion for bidding and tendering in transmission engineering projects.