[brief introduction]
Insulators are usually made of glass and porcelain. It is mainly used to fix wires to poles, and to insulate wires and poles. Insulator is one of the key components of high voltage transmission line, and its performance directly affects the operation safety of the whole transmission line. Glass insulators are widely applied due to the characteristics of zero breaking and easy maintenance.
[advantages]
In the first few years of production and operation of glass insulators, it is found that it has the following advantages over porcelain insulators.
Because the mechanical strength of glass insulator surface is high, the surface is not easy to crack. The electrical strength of the glass is generally kept unchanged throughout the operation, and its aging process is much slower than that of porcelain. Therefore, the glass insulators are largely discarded because of their self damage, and they occur within the first year of operation, but the defects of porcelain insulators are only discovered after several years of operation.
Using glass insulator, we can cancel the live periodic preventive test of insulators during operation. This is because every damage of toughened glass will cause insulators to damage, and operators can easily find it when they patrol the line. When the insulator is damaged, the glass fragments near the steel cap and iron foot are jammed, and the mechanical strength of the remaining part of the insulator is enough to prevent the insulator string from breaking. Self destruction rate of glass insulators is one of the most important indicators of product quality. It is also the quality basis for bidding evaluation of transmission engineering.