An insulator is a device used to support and fix conductors in power systems, while isolating the electrical contact between the conductors and the brackets or conductive parts. Its main function is to prevent current from flowing along the brackets and to prevent the conductors from discharging to the ground due to arcs or lightning overvoltages. Composite insulators are a type of insulator commonly used in power lines. They are made of composite materials such as glass fiber reinforced plastic (FRP) and have the advantages of light weight, good insulation performance, and corrosion resistance.
Insulators are mainly divided into the following categories:
Composite insulators: Made of composite materials such as glass fiber or carbon fiber, with high mechanical strength and electrical properties. Mainly used in high-voltage and ultra-high voltage transmission lines.
Glass insulators: Traditional insulators, usually made of glass or ceramic, have good insulation properties and mechanical strength, mainly used in medium and low voltage lines.
Ceramic insulators: Also known as porcelain insulators, similar to glass insulators, made of special ceramic materials, suitable for transmission lines of different voltage levels.
Metal insulators: Usually made of aluminum alloy, with good corrosion resistance and mechanical strength, suitable for outdoor environments.
The functions of each insulator are as follows:
Increase creepage distance: Insulators can increase the distance between the conductor and the ground and reduce the probability of arc grounding faults.
Support conductors: Insulators can fix and support the conductors to keep them stable in the air.
Prevent current from returning to the ground: Insulators can effectively prevent current from returning to the ground through air or other media, thereby protecting lines and equipment.
Prevent pollution: Insulators can block pollutants such as water droplets and dust, preventing them from adhering to the insulation surface and affecting insulation performance.
