Why are pressed polymer insulators suitable for low-voltage overhead lines?
Publish Time: 2025-06-16
In modern power systems, with the continuous advancement of urbanization and rural power grid transformation, the application of low-voltage overhead insulated conductors is becoming more and more widespread. As an important component to ensure the stable operation of the line, pressed polymer insulators have become an ideal choice to replace traditional porcelain insulators with their advantages such as optimized structure, reliable performance and convenient installation. It is especially suitable for the shared use of straight and corner poles and towers, and has excellent performance in wind resistance, anti-aging, heat resistance and other aspects, providing a solid guarantee for the safe operation of the power grid.Pressed polymer insulators are made of high-performance polymer materials through a molding process and have excellent insulation performance and mechanical strength. Its product design fully considers the complex working conditions in actual applications and integrates multiple innovative functions. For example, the torque nut structure configured on the top can effectively prevent the conductor from loosening or displacement due to vibration or wind during long-term operation, ensuring the stability of the line connection; the fish-mouth structure design takes into account the use requirements of straight and corner poles and towers, simplifies the installation process and improves construction efficiency.Pressed polymer insulators also pay special attention to the protection function of the conductor. Wear-resistant washers are installed inside to prevent the surface wear of the conductor caused by friction during long-term operation, thereby extending the service life of the conductor; the widened fixed area design further improves the uniformity of the clamping force distribution and effectively reduces the risk of conductor breakage. In addition, the ultra-low structure design can prevent the conductor from jumping under the action of wind or other external forces, thereby improving the safety and reliability of line operation.From the perspective of mechanical properties, pressed polymer insulators have extremely high lateral tensile bearing capacity, usually up to 10KN or more, and can withstand the influence of extreme weather such as strong winds, typhoons, and even floods and waterlogging. The wind speed bearing capacity is not less than 50 meters per second, which greatly enhances the disaster resistance of the power grid. At the same time, the clip-on installation method replaces the traditional binding structure, which not only improves the installation efficiency, but more importantly, avoids the problem of heating of the binding metal caused by the eddy current effect of the motor, thereby preventing the aging, shedding or loosening of the local insulation layer of the conductor, and ensuring the long-term stable operation of the line.In terms of weather resistance and service life, pressed polymer insulators also perform well. After the xenon arc lamp test, its direct weathering time exceeded 1,000 hours. After simulating the aging process in the natural environment, it can still maintain good mechanical and electrical properties. The service life is expected to reach 20 years, which is much higher than that of traditional materials. In the heat resistance test, the diameter of the steel ball indentation is less than 2mm, indicating that the material can still maintain a stable physical structure under high temperature conditions, further verifying its quality reliability.Pressed polymer insulators have become an indispensable key component in low-voltage overhead insulated conductor systems due to their reasonable structure, superior performance, convenient installation, and long life. Whether in new distribution networks or old line reconstruction projects, it can provide stable, safe, and efficient insulation support to help build a more intelligent, green, and reliable modern power grid system.
