Glass insulators, in the initial years of production and operation, have been found to have 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 the glass generally remains unchanged throughout its operation, and its aging process is much slower than that of porcelain. Therefore, glass insulators are mainly 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 periodic preventative tests on energized insulators 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 routine inspections. When an insulator is damaged, glass fragments are trapped near the steel cap and iron base, and the remaining mechanical strength of the insulator is sufficient to prevent the string from breaking. The breakage rate of glass insulators is an important quality indicator and serves as a quality basis for bid evaluation in transmission projects.