insulating post: is a special cable insulation control, an electrical material, which can play an important role in the overhead cables of transmission.
In the first days, post insulators were used primarily for electrical poles.
They gradually developed from the end of high-type high-voltage electrical cable connection towers with many suspended insulators., which were usually made of silica gel or ceramic to increase creepage distance. They are called insulators..
Insulator in aerial transmission cables with two basic functions, namely, support cable and prevent back current, these two functions must be guaranteed.
The insulator must not change due to environmental and electrical load conditions that cause various stresses and electrical and mechanical failures., or else it will not have a significant role in the insulator, will damage the entire line of use and service life.
Suspension insulators are usually made of insulating pieces (like porcelain pieces, glass pieces) and metal accessories (like legs of steel, iron caps, flanges, etc.) glued or mechanically attached. Insulators are widely used in electrical systems.
In general, belong to external insulation and work in atmospheric conditions.
Live external conductors of overhead transmission lines, power plants and substations, and various electrical materials must be supported by insulators and isolated from earth (or ground objects) or other conductors with potential differences.