400kv Overhead Power Transmission Lines Stringing Equipment Tools manufacturer
A 400kV overhead power transmission line stringing project involves the installation of high-voltage conductors and earth wires on transmission towers designed for 400kV operation, ensuring efficient and reliable power transfer over long distances.
Key Components and Materials:
Conductors: Typically ACSR (Aluminum Conductor Steel Reinforced) types such as Twin Moose, with specifications like 54 strands of aluminum and 7 strands of steel, diameter ~31.77 mm, current capacity ~950 Amps, and tensile strength around 161 kN.
Earth Wire: Usually two earth wires are installed for lightning protection, made of galvanized steel strands, diameter ~10.98 mm, tensile strength ~68 kN.
Insulators: Pin, disc, long rod, anti-fog, or polymer types rated for 11kV per unit, assembled in strings to withstand 400kV line voltage.
Accessories: Vibration dampers, bundle spacers, suspension clamps, tension clamps, and repair sleeves to maintain mechanical integrity and reduce conductor oscillations.
Stringing Methods
| Method | Description | Applicability |
|---|---|---|
| Slack/Stringing Layout | Conductor is dragged along the ground or laid out on wooden blocks; low tension; cheaper but risk of conductor damage | Flat terrain, non-critical lines, easy access |
| Tension Stringing | Conductor is pulled under controlled tension to keep it off the ground and obstacles; ensures minimal damage | Most common for 400kV lines, especially in difficult terrain |
| Helicopter Stringing | Use of helicopters to carry pilot lines and conductors over inaccessible or rugged terrain | Mountainous or environmentally sensitive areas |
The controlled tension method is preferred for 400kV lines to maintain conductor integrity and safety, using OHTLstringingequipment.com/Hydraulic-Conductor-Tensioners.html target='_blank'>Tensioners, pullers, and OHTLstringingequipment.com/Reel-Stands--Cable-Winders.html target='_blank'>Reel Stands.
Stringing 400kV overhead transmission lines requires specialized equipment and tools to ensure safety, efficiency, and the integrity of conductors and accessories. Below is a comprehensive overview of the core equipment and tools typically used in such projects.