Stranded wire for cable production process

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First, the characteristics of stranded wire

1. Good flexibility: it can reduce the damage caused by bending, vibration and swinging, which is conducive to installation.

2. Good reliability: the defects of the single wire that make up the stranded wire cannot be concentrated in the same place, so the impact of the single wire defect on the performance of the

stranded wire is much weaker than that on the performance of the single conductor.

3. High strength: When using the same rod wire, the drawn thin wire is deformed more than the thick line, so the strength of the fine line is high. The strength of the stranded wire is higher than that of a single conductor of the same section.

Second, the classification and use of stranded wire

A Plain stranded wire

1. Aluminum stranded wire: the conductor is light in weight and has good conductivity, and is used for overhead power lines with less force.

2. Copper hard stranded wire: superior electrical performance, used for overhead transmission lines.

3. Aluminum alloy stranded wire: high tensile strength, twice that of aluminum stranded wire,

conductivity 10% lower than aluminum stranded wire, used in glaciers, mountains, hills and other areas of general lines and large span transmission lines.

4. Aluminum-clad steel strand: superior mechanical properties, used for large span lines.

B Combination stranded wire

1. Steel core aluminum stranded wire: high tensile strength. It is used for overhead transmission lines, distribution lines, heavy ice areas and long-span transmission lines.

2. Anti-corrosion steel core aluminum stranded wire: the performance is the same as steel core aluminum stranded wire, steel core anti-corrosion, prolong the service life of the wire, used in saltwater lakes, coasts, industrial areas and areas with heavy corrosive atmosphere.

3. Steel core aluminum clad steel strand: improve the anti-corrosion of steel core, extend the service life of conductors, and be used for large span lines or lightning protection wires.

4. Compressed steel core aluminum stranded wire: high tensile strength, smooth wire surface, used for transmission lines, can increase the span of the tower.

C Special stranded wire

1. Expanded diameter steel core aluminum stranded wire: increase the outer diameter, save metal, reduce corona, used in high-voltage transmission lines and high altitude areas.

2. Expanded hollow conductor: larger outer diameter, saving metal, reducing corona, used in high-voltage substations.

3. Vibration damping and gap type conductors: each strand layer is separated, can self-dampen, and is used in multi-storm areas.

4. Anti-ice and snow stranded wire: strong ice and snow resistance, used in heavy ice areas.
5. Copper brush wire: stable structure, good flexibility, stranded and retwisted, used for motor lead wire.

6. Bare copper soft stranded wire: the use of stranded formal stranding, bundle twisting, no double stranding or bundle twisting and then according to the formal stranding and re-twisting, etc., used to connect motors, electrical equipment parts.

7. Copper braided wire: soft wire, used for the connection of mobile electrical equipment, but also for the wiring of automobile and tractor batteries.
8. Aluminized steel core aluminum stranded wire: basically the same as steel core aluminum stranded wire. It can reduce the potential difference between zinc and aluminum and avoid electric field distortion.

9. Weather-resistant insulated overhead line: overhead line with polyethylene sheath. Used for walking through woods or cities.


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