A composite insulator, also called a dielectric or nonconductor, is a material that resists the flow of electric current. This type of silicone rubber material is used in parts of electrical equipment intended to support or separate electrical conductors without passing current through itself. The term is also used more specifically to refer to insulating supports that attach electric power transmission wires to utility poles or pylons.
Composite insulators are less costly, lighter in weight, and have excellent hydrophobic capability. This combination makes them ideal for service in polluted areas. However, these materials do not yet have the long-term proven service life of glass and porcelain.
Composite insulator composite polymer insulator composite silicon insulator is a special type of insulation control which plays an important role in overhead transmission lines.
Composite insulators are also known as synthetic insulators, non-porcelain insulators, polymer insulators, rubber insulators and so on. The main structure is generally composed of shed skirt, FRP mandrel and end parts. The shed skirt is generally made of organic synthetic materials, such as ethylene propylene rubber, high temperature vulcanized silicone rubber, etc. Generally, FRP mandrel is reinforced with glass fiber and oxidized resin. The end fittings are generally carbon steel or carbon steel structural steel coated with hot zinc aluminum.
Silicon rubber insulator classification silicon rubber insulator silicon rubber composite insulator
Composite insulator can be divided into: line composite insulator and power station composite insulator, electrical composite insulator. It can also be divided into rod suspension composite insulator, pin composite insulator, crossarm composite insulator, post composite insulator, and wind-proof local composite insulator.
Advantages of silicone composite insulator
Small size, easy to maintain;
Light weight, easy installation;
High mechanical strength, not easy to break;
Good anti-seismic performance, good anti-pollution;
Fast production cycle, stable quality.
The final fitting structure
The structure of composite insulator varies with the characteristics of use. In order to meet the tensile strength, meet the requirements, and reliable connection with the spindle, the design of the metal head also needs to meet the special requirements of high pressure use. Composite insulators are generally made into bars with small capacitors. Therefore, the voltage distribution on the insulator surface is very uneven. Therefore, in normal operation, the corona produced is harmful, so it is necessary to adopt pressure balancing measures. In addition, synthetic insulators cannot withstand arcs of tens of amperes. In the case of a short-circuit fault, it will burn out nearby wires and tower umbrellas, so an arc is necessary. The method of adding equalizing pressure ring is widely used at home and abroad to make the electric field of the end face even and the corona weaken, resulting in fault arc.
The voltage balance ring of composite insulator is a component of composite insulator. Its function is to control the electric field intensity inside the insulator, avoid the internal partial discharge, reduce the local electric field intensity on the outer surface, especially on the surface of the metal connector, and reduce the radio interference. The electric arc of power frequency is introduced to avoid burning the surface of the insulator, so as to minimize the local electric field strength near the end face of the insulator and improve the anti-pollution performance of the insulator.