The function and process characteristics of high-voltage insulators Insulators (commonly known as porcelain bottles) are composed of a porcelain part and a metal part, and are cemented with a cement binder in the middle. The porcelain part is to ensure that the insulator has good electrical insulation strength, and the metal fitting is used for fixing the insulator. The function of the high-voltage insulator has two aspects: one is to firmly support and fix the current-carrying conductor, and the other is to form a good insulation between the current-carrying conductor and the ground. It should have sufficient dielectric strength and mechanical strength, and at the same time be sufficiently resistant to chemical impurities and adapt to changes in the surrounding atmosphere, such as the effects of temperature and humidity changes on itself.
The high-voltage insulator, also known as the insulator, consists of a rod core, an umbrella disk and a metal end iron cap.
(1) The rod core is generally made of epoxy glass fiber (glass fiber rod), which has high strength (6~10 t/cm2), twice as much as steel and 3~4 times higher than porcelain. The rod core has to withstand tension and internal insulation.
(2) Composite insulator umbrella disk: It is made of high-molecular polymer such as polytetrachloroethylene, silicone rubber, etc., and is made of special wool. The surface of the umbrella disk is insulated to provide the required creepage distance to the insulator.
(3) The metal end is used for the connection of the wire pole tower and the high voltage insulator. It is made of materials such as malleable iron, ductile iron or steel depending on the load carrying capacity. In order to bond the rod core and the umbrella disc, a layer of adhesive and rubber sheath is added between them.
Since the high-voltage insulator is an elongated member, the electric field distribution is uneven to improve the electric field distribution and arc-ignition, and a pair of equalizing rings are required for the high-voltage insulators above 10 kV.
High voltage insulators have obvious advantages:
(1) Anti-fouling high-voltage insulators have water-repellent surface, water is grit-like on the surface, and it is difficult to form conductive paths. The high-voltage insulator has a small diameter, large creepage distance, high surface resistance and small leakage current. Higher pollution flash voltage.
(2) High strength and light weight: Because the rod core has high tensile strength, the high-voltage insulator can be made light to reduce the force of the tower, and the installation and maintenance strength can be saved and the cost is saved.
(3) Good aging resistance: The high-voltage insulator has good corrosion resistance and aging resistance, and still has elasticity at 70 ° C, and can work for a long time at 20 ° C.
(4) Small size and light weight Because the high-voltage insulator is small in size and light in weight, and the umbrella disk is flexible and not easily damaged, it brings great convenience to transportation, installation and maintenance.
The application of high-voltage insulators is higher than porcelain insulators, but high-voltage insulators are the most ideal materials for long-term comprehensive economic benefits. The higher the voltage, the more obvious the economic benefits are related to high-voltage insulators.
High voltage insulator technical requirements http://
High voltage insulator terminology and definition http://
Composite insulator normative reference file http://
Different high voltage insulator wiring specifications http://
Method to prevent high voltage insulator from flashing faults http://
Harm of bad weather on high voltage insulators on transmission lines http://
Composite insulator requirements for insulating sheath and shed material http://
Composite insulator size deviation technical requirements http://
What are the normative references for high voltage line insulators ? http://
What is a composite post insulator http://
Composite insulators to support the requirements of metal accessories, collaborative B2B Website navigation http://hao.cngaoge.cn) http: // (electrical equipment Network
The function and process characteristics of high voltage insulators