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-damage, which occurs within the first year of operation, whereas defects in porcelain insulators are only discovered after several years of operation.

Glass insulators eliminate the need for regular preventive tests of the insulators during operation, as any damage to the toughened glass will immediately damage the insulator, making it easy for maintenance personnel to identify 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 rate of spontaneous breakage of glass insulators is a crucial indicator of product quality and a key quality basis for bidding and evaluation in transmission engineering projects.