Devices mounted between conductors or conductors of different potentials and grounded components that are capable of withstanding voltage and mechanical stress. Insulators come in a wide variety of shapes. Although the structure and appearance of different types of insulators are quite different, they are composed of two parts: insulating parts and connection hardware.

Insulators are special insulation controls that can play an important role in overhead transmission lines. In the early years, insulators were mostly used for utility poles, and slowly developed at the end of high-voltage high-voltage electric wire connection towers where a lot of disc-shaped insulators were hung. This is to increase the creepage distance. Usually made of glass or ceramics, they are called insulators. Insulators should not fail due to various electromechanical stresses caused by changes in the environment and electrical load conditions, otherwise the insulators will not have a significant effect and will impair the use and operating life of the entire line.

Insulator function and requirements

The main function of insulators is to achieve electrical insulation and mechanical fixation. For this purpose, various electrical and mechanical performance requirements are specified. Under the action of the specified operating voltage, lightning overvoltage and internal overvoltage, no breakdown or flashover along the surface occurs; under the specified long-term and short-term mechanical load, no damage and damage will occur; in the specified machine After the long-term operation under the electric load and various environmental conditions, no significant deterioration occurs; the fittings of the insulator do not produce obvious corona discharge under the operating voltage, so as not to interfere with the radio or television reception. Because insulators are widely used devices, they are also required to be interchangeable. In addition, the technical standards of insulators also require various electrical, mechanical, physical, and environmental conditional changes to test the performance and quality of insulators, depending on the type and conditions of use.