Electric Power Equipment
Preformed armor rods are products made by pre-stranding several single-strand helical metal wires. According to the cross – sectional size of the conductor, the helical metal wires with a specified inner diameter are rotated along the helical direction to form a tubular cavity. The preformed armor rods are helically wrapped around the outer layer of the conductor. Under the action of the conductor’s tension, the helix rotates, forming an anchoring force and gripping force on the conductor. The greater the conductor’s tension, the tighter the helix rotates, and the greater the gripping force on the conductor.
In the past, repair preformed armor rods were widely used in 35 kV and above lines, but they were rarely used in 10 kV lines. Moreover, they could only be used on line segments with a broken strand ratio of 7% or less and a small damage range, failing to achieve the reinforcement effect.
Tension preformed splice sleeves are a new type of preformed armor rod product that has emerged in recent years. They are used as a kind of splicing fitting. They can replace conventional compression splice sleeves and crimping sleeves, and can be used to connect conductors such as aluminum stranded wires, aluminum alloy stranded wires, and steel-cored aluminum stranded wires, so as to achieve their original mechanical strength and electrical conductivity.
