Long Rod Composite Suspension Insulator: A New High-Efficiency Insulation Option for High-Voltage Transmission
The Long Rod Composite Suspension Insulator is a core insulation and suspension component for high-voltage and ultra-high-voltage transmission lines. It combines the lightweight advantages of composite materials with the stable support characteristics of a suspension structure. Compared to traditional porcelain and glass insulators, it achieves multiple breakthroughs in insulation performance, environmental adaptability, and ease of operation and maintenance. It has become the mainstream choice in modern power grid upgrades and is widely used in conductor suspension and insulation protection scenarios for various high-voltage transmission projects.
The core structure of this insulator consists of three parts: an insulating core rod, a silicone rubber shed sheath, and end fittings. These components are tightly integrated using a one-piece manufacturing process. The insulating core rod is made of epoxy resin glass fiber pultrusion molding, possessing extremely high mechanical strength, excellent insulation performance, and fatigue resistance, with tensile strength far exceeding that of traditional ceramic core rods. The shed sheath is made of high-temperature vulcanized silicone rubber, injection molded onto the core rod surface, resulting in a smooth surface with good hydrophobicity, effectively resisting pollution flashover and wet flashover risks. The end fittings are made of hot-dip galvanized carbon steel or aluminum alloy, firmly connected to the core rod through a crimping process, ensuring overall mechanical load-bearing capacity and excellent corrosion resistance.
The most prominent advantage of the long-rod composite suspension insulator is its balanced comprehensive performance, making it suitable for complex power transmission environments. Firstly, its lightweight design significantly reduces its weight, weighing 50%-70% less than porcelain insulators of the same voltage level, greatly reducing the load on towers and lowering construction costs. Secondly, the excellent hydrophobicity of its silicone rubber skirts is a key highlight; even in heavily polluted, high-humidity environments, the surface can quickly drain water, making it less prone to dust, oil, and other contaminants. Its flashover voltage is much higher than traditional insulators, eliminating the need for frequent cleaning and maintenance. Thirdly, it boasts stable mechanical properties, strong impact and vibration resistance, and is less prone to breakage issues like porcelain insulators or spontaneous breakage of glass insulators. Its service life can reach over 20 years, significantly reducing operation and maintenance costs.
Furthermore, this insulator also possesses excellent weather resistance and adaptability, capable of adapting to various harsh environments such as high altitudes, strong ultraviolet radiation, extreme cold and heat, and coastal salt spray. It also covers a wide voltage range, with corresponding product specifications available for ultra-high voltage and extra-high voltage transmission lines from 110 kV to 1000 kV and above. Meanwhile, its compact structure and convenient installation allow it to directly replace traditional suspension insulator strings without requiring adjustments to the existing tower structure, significantly improving construction efficiency.
In practical applications, long-bar composite suspension insulators are primarily used in core scenarios such as conductor suspension and jumper support in high-voltage transmission lines. They provide reliable insulation between conductors and towers while withstanding complex mechanical loads such as conductor tension, wind loads, and icing. Whether in urban high-voltage transmission corridors, remote mountain transmission lines, or ultra-high-voltage projects in coastal salt-spray areas and high-altitude plateau regions, this insulator, with its core advantages of high-efficiency insulation, stable reliability, and convenient maintenance, provides a solid guarantee for the safe and stable operation of the power grid, contributing to the development of modern power transmission systems towards high efficiency, energy saving, and low maintenance.