In overhead transmission lines, ACSR conductors that can operate safely are important conductive components and are very important for the stability of power transmission. Preformed armour rods for ACSR conductor, as a protective device designed for ACSR conductors, is a spiral metal component manufactured by the preformed forming process. It realizes multiple protective functions by tightly wrapping the outer layer of the wire, which plays an important role in the construction of power lines.
From the structural point of view, the preformed armour rods for ACSR conductor adopts a spiral winding design. The single guard line is formed by a multi-strand aluminum alloy wire through the preforming process, and the whole presents a continuous spiral curve shape. The pitch and inner diameter are accurately calculated, which exactly matches the outer aluminum strand parameters of the ACSR conductor. This design allows the guard line to form a tight fit with the wire after installation, and it will neither cause vibration and wear due to excessive clearance, nor cause additional stress due to excessive tightness. In terms of material selection, preformed armour rods for ACSR conductor usually use high-strength heat-resistant aluminum alloy. This material not only has electrical conductivity similar to the outer aluminum strand of the ACSR conductor, but also has higher mechanical strength and corrosion resistance.
The most important function of preformed armour rods for ACSR conductor is to protect the ACSR conductor in all directions. In terms of mechanical protection, the guardrail disperses the external impact force and friction force to a wider range of wires through a spiral structure to prevent excessive local force on the wires from causing broken strands. In terms of dynamic stress relief, the guard line can reduce the fatigue effect of the wire due to wind vibration, and the spiral structure can also absorb part of the vibration energy, reducing the amplitude and vibration frequency of the wire, thereby delaying the fatigue aging of the aluminum strand. In terms of environmental protection, the protective line can prevent rain, dust, salt and other corrosive media from directly contacting the surface of the wire, reducing the probability of electrochemical corrosion, especially in harsh environments such as coastal and industrial areas, the effect is obvious.
The application scenario and installation process of preformed armour rods for ACSR conductor are also worth mentioning. In terms of application scenarios, preformed armour rods for ACSR conductor are mainly used in easily damaged parts of ACSR conductors, including the connection between the wire and the insulator string, near the clamp of the tension-resistant pole tower, the middle section of the wire that spans a large gear distance, and the line section that passes through mountainous and forested areas. These parts are prone to damage either because of the concentration of mechanical stress, or because of the complex environment and easy to be eroded. The installation of the guard line can significantly improve the safety level of the conductor. In terms of installation technology, preformed armour rods for ACSR conductor adopts a cold tool-free installation method, without fire operation or complex mechanical assistance. During installation, only the construction personnel are required to spiral the guard line around the wire according to the preset pitch, and the elastic tension of the material itself is used to achieve a close fit. The whole process can be completed in a short time, reducing the difficulty of construction and safety risks.