Aluminum conductors steel-reinforced refers to a reinforced wire in which single-layer or multi-layer aluminum strands are twisted outside the galvanized steel core wire. Mainly used in power and transmission line industries. It can be seen that its quality directly affects the safety of power transmission. The main reasons that affect the quality of steel core aluminum stranded wire and the improvement methods are discussed below.
The main reason affecting the quality of steel core aluminum stranded wire
Stranding process
1. Single wire break:
main reason:
1 The single wire is wound loosely on the wire reel, or the single wire is pulled too tightly on the wire position;
2 The threading pipe has grooves caused by friction to block the thread; the single thread is knotted, or the pay-off disc brakes tightly.
3. Single line arch, loose, serpentine
main reason:
1) The selection of pitch diameter ratio is unreasonable;
2) The position of each single wire on the stranding cage distribution board is staggered and unevenly distributed;
3) The die aperture is too large;
4) Individual single thread tension is too large.
2. Production management
During the production process, the quality of incoming raw materials should be strictly controlled; attention should be paid to avoid mechanical damage caused by bumps in the spool during transportation; attention should be paid to the storage location of the aluminum wire, and damage caused by corrosion of corrosive medium and humid air
.
the measures taken
1. Stranding process
1 Check whether the single wire has uneven or crimped wires. Pay attention to the neatness of the wire reel during the drawing process;
2 Replace the worn-out threading pipe in time;
3 Check whether the top of the spool is flexible, and ensure that the bearing is lubricated well;
4 Check whether the tension setting of the pay-off reel is uniform, and adjust the tension according to the actual situation.
2. Stranding process
1. Before production, select the proper pitch diameter ratio, twisting rate, twisting pitch length and twisting direction and other parameters. They have a direct impact on product quality, stability, strength, resistance and material consumption;
2. Reasonably adjust the position distribution of the single line on the breakout board according to work experience;
3. Choose a suitable press hole grid. Generally, the die diameter is required to be 0.3-0.5mm smaller than the wire outer diameter;
4. Reasonably adjust the tension of the pay-off reel to ensure that the tension of each single thread is moderate and consistent;
5. Adjust the back-twisting device and the angle should be consistent to eliminate the internal stress generated by the guide during the processing;
6. Minimize the number of stops during the stranding process and try to produce uniformly.
The above is about the main reasons that affect the quality of ACSR and improvement methods. I also want to expand a little bit of knowledge about steel-cored aluminum stranded wire. It is about its advantages: the ACSR has a simple structure, easy installation and maintenance, low line cost, large transmission capacity, and is conducive to laying across rivers and valleys and other special geographical conditions. It has good electrical conductivity and sufficient mechanical strength. , The tensile strength is large, and the tower pole distance can be enlarged. Therefore, it is widely used in overhead transmission and distribution lines of various voltage levels. I hope it can help everyone to have a deeper understanding of ACSR Cable.