Glass insulators, discovered to have a series of advantages over porcelain insulators during the initial 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 the glass generally remains consistent throughout its operational period and its aging process is much slower than that of porcelain. Consequently, 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 use.

Glass insulators eliminate the need for regular preventive tests with live electricity 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 the 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. The self-breakage rate of glass insulators is an important indicator of product quality and a quality criterion for bidding and tendering in transmission engineering projects.