In the tension section across the Yangtze River in China's "West-to-East Power Transmission" project, preformed conductor strain clamps are used to replace traditional bolt-type wire clamps to avoid conductor damage caused by stress concentration. The Preformed wire is fully in contact with the conductor. Through field testing, it has been running in strong wind areas for 3 years without slippage or broken strands, and the maintenance cost is reduced. Preformed conductor strain clamps play an important role in preformed hardware.
Preformed wire is a product made by preformed several single-strand spiral metal wires. According to the cross-sectional size of the conductor, the spiral metal wire with a specified inner diameter is rotated in the spiral direction to form a tubular cavity. The Preformed wire is wrapped around the outer layer of the conductor along the spiral. Under the action of the conductor tension, the spiral rotates to form an anchoring force grip on the conductor. The greater the conductor tension, the tighter the spiral is rotated, and the greater the grip on the conductor.
Preformed conductor strain clamps are gradually replacing traditional bolt-type wire clamps. Preformed wire tension clamps have become a new choice for high-load transmission lines with their excellent fatigue resistance. Unlike bolt wire clamps, which are prone to wire breakage due to stress concentration, preformed wires achieve uniform stress distribution through a spiral structure, effectively alleviating metal fatigue caused by breeze vibration. Engineering data shows that the section using preformed wire clamps has not experienced a broken strand failure in three years of operation, while traditional wire clamps need to be repaired every 18 months on average under similar conditions.
Improved construction efficiency is another major advantage of preformed wires. Traditional bolt wire clamps rely on heavy hydraulic equipment and are difficult to carry in high-altitude areas, while preformed conductor strain clamps only require two people to manually wind to complete the installation. In addition, the lightweight design of preformed wires reduces the manpower burden in plateau areas and further speeds up the progress of the project.
Therefore, preformed conductor strain clamps are more popular in UHV transmission lines. As a preformed wire factory, Vilun has launched preformed conductor strain clamp products. Its product design focuses on practicality and stability, and has been used in many key projects in China. Vilun preformed conductor strain clamp adopts reasonable structural design, which can effectively disperse the stress of the conductor and reduce the common wear problems of traditional wire clamps. In terms of material selection, the company insists on using high-quality alloys to ensure that the product can maintain good performance in various environments. In terms of installation, Vilun wire clamps are easy to operate, which helps to improve construction efficiency and save time for engineering construction.
