Advantages of glass insulators

In the first few years of production and operation, glass insulators were found to have a series of advantages over porcelain insulators:
Due to the high mechanical strength of the surface layer of glass insulators, cracks are less likely to occur on the surface. The electrical strength of glass generally remains unchanged throughout the entire operation period, and its aging process is much slower than that of porcelain. Therefore, glass insulators are mainly scrapped due to self damage and occur within the first year of operation. However, defects in porcelain insulators only begin to be discovered after a few years of operation.
By using glass insulators, regular preventive tests on insulators during operation can be cancelled. This is because every type of damage to tempered glass can cause damage to the insulator, and operators can easily detect it during line inspections. When the insulator is damaged, the glass fragments near the steel cap and iron foot are stuck, and the mechanical strength of the remaining part of the insulator is sufficient to prevent the insulator string from breaking off. The self rupture rate of glass insulators is one of the important indicators to measure product quality, and it is also the quality basis for bid evaluation in current transmission engineering bidding and tendering.