Pre-formed Wire Repair Process

The armour rod in transmission line is a product made of several single-strand helical metal wires pre-twisted together. According to the wire cross-section size, the helical metal wires of a specified inner diameter are rotated in the helical direction to form a tubular cavity. The armor rods conductor is helically wrapped around the outer layer of the wire. Under the tension of the wire, the helix rotates, creating an anchoring force and grip on the wire. The greater the wire tension, the tighter the helix rotates, and the greater the grip on the wire. Previous repair methods armor rod preformed were widely used in 35 kV and above lines, but less so in 10 kV lines, and could only be used on wire sections with less than 7% broken strands and limited damage, failing to achieve a reinforcing effect. Tension preformed armour rod splices are a new type of armor rods product that has emerged in recent years. It is used as a splicing fitting. It can replace conventional crimp connectors and compression sleeves, and can be used to connect aluminum stranded wires, aluminum alloy stranded wires, steel-cored aluminum stranded wires, etc., achieving their original mechanical strength and conductivity.
At the construction site, a complete set of tension armor rods for acsr splices is used. The center mark of the steel core splice is placed at the end of one wire. Measure half the length of the splice plus 6.35mm along the wire direction, wrap tape at this point, and cut off the outer aluminum wire to expose the inner steel core. Treat the other wire in the same way. Select the group of steel core splices with the most components. Start by placing the center mark at the end of one steel core and wrap half of its length onto the wire. Place the end of the other wire near the center mark, so that the two ends are approximately 2mm apart, and completely wrap the splice onto the wire. Place the second group of splices at the center mark, wrapping one to two pitches on each side of the center. Install the third group of splices in the same way. The steel core splice is now fully installed. To ensure reliable electrical connection, all wires, whether new or old, must be thoroughly polished before installation. High-quality conductive paste should be used to delay oxidation. Select the group of outer connecting strips with the largest number of components and carefully wrap them, aligning their center marks with the center mark. Place the second group of connecting strips at the center mark, wrapping one or two pitches on each side of the center. Install the third group of connecting strips in the same way, then wrap the second and third groups of connecting strips simultaneously until they are completely wrapped. Once the tension connecting strips are fully installed, the ends of the outer connecting strips can be positioned by bending the wires or rotating the strips with your thumb.