A device capable of withstanding voltage and mechanical stress installed between conductors with different potentials or between conductors and grounding components. There are many kinds and shapes of composite post insulators. Although the structure and shape of different types of insulators are quite different, they are all composed of insulating parts and connecting fittings. Insulator is a special insulation control, which can play an important role in overhead transmission line. In the early years, insulators were mostly used in power poles, and gradually developed in high-voltage power lines. Many disc-shaped insulators were hung at one end of the connecting tower.
It is to increase the creepage distance. It is usually made of glass or ceramic, which is called insulator. The insulator shall not fail due to various electromechanical stresses caused by changes in environmental and electrical load conditions, otherwise the insulator will not play a significant role and will damage the service and operation life of the whole line. Insulators can be divided into suspension insulators and post insulators according to different installation methods; According to the different insulating materials used, they can be divided into porcelain insulator, glass insulator and composite insulator (also known as composite insulator).
It can be divided into low-voltage insulator and high-voltage insulator according to different voltage levels; According to the different environmental conditions, the pollution resistant insulators used in polluted areas are derived; DC insulators are derived according to different types of applied voltages; There are also insulators for various special purposes, such as insulation cross arm, semiconductor glaze insulator, tension insulator for power distribution, spool insulator and wiring insulator. In addition, according to the different breakdown possibility of insulating parts, they can be divided into type A, i.e. non breakdown insulator and type B, i.e. breakdown insulator.
