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, 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 primarily 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.

Using glass insulators eliminates the need for periodic preventive tests on the insulators during operation, as any damage to the tempered glass will cause the insulator to fail, making it easily detectable by maintenance personnel during routine 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 string from breaking. The self-breakage rate of glass insulators is a crucial quality indicator and serves as a basis for quality assessment during bidding and tendering for transmission projects.