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 constant throughout its operation, and its aging process is much slower than porcelain. Therefore, glass insulators are primarily retired due to self-destruction, which occurs 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. This is because any damage to the tempered glass will destroy the insulator, making it easily detectable during routine maintenance. When an 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 off.