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

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

Glass insulators eliminate the need for regular preventive tests with live charging during operation. This is because any damage to the tempered glass will cause the insulator to fail, making it easily detectable by maintenance personnel during inspections. When an insulator is damaged, glass fragments near the steel cap and iron foot get 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 quality basis for bidding and tendering in transmission projects.