The rated breaking force of the conductor is calculated based on the strength of all the aluminum single wires and reinforcements. However, the actual braking force deviates from the true calculated value. The main reason for this is that the strength of every single wire is not fully utilized. Therefore, when designing the product not only to meet its minimum strength requirements but also to consider how the strength of every single wire is tapped out. Not only is it a full use of the material, but the overall performance of the wire will also be greatly improved.
With the continuous upgrading of the power system, various new products have come into being, such as steel core aluminum strand, aluminum-clad steel core aluminum strand, aluminum-clad steel core aluminum alloy strand, aluminum alloy strand, aluminum alloy core aluminum strand, aluminum-clad steel core heat-resistant aluminum alloy strand, etc. However, the overall tensile performance has been a major issue in the design of overhead strand products.
Aluminum alloy core aluminum strand overall performance improvement skills
First, from the strength, adjust the uniformity of every single line.
Every single line according to the size of its strength, the degree of stress-bearing is different. Just as the tension sensor has the best tensile range, more than its range will not only damage the equipment but also cause deviations in the data. The aluminum single line is also the same, the different strength of the aluminum single line on the stress of the degree of bearing is also different. When these strength deviations of the single line are stranded together, the stress is uniformly distributed to every single line. The strength of the single line will be small enough to carry the degree of early fracture, while the strength of the single line will not play its role. Therefore, the strength of the extreme difference is an important parameter to test the utilization of mechanical properties.
Second, from the elongation and section diameter ratio to adjust the elongation and section diameter ratio of the size.
The elongation of the steel wire on the overall tensile properties of the impact is also great. Numerous experiments have proved that the overall tensile force of aluminum clad steel cored aluminum strand is easy to fail the phenomenon. The main reason for this is that the elongation of aluminum-clad steel is too small. The aluminum wire mechanical properties of the utilization rate are too low. When the aluminum wire is stranded, the smaller the pitch, the better its ductility. The higher the elongation requirement of the steel wire. The elongation of the aluminum-clad steel wire is about 1.0, and the aluminum wire is also about 1.0, plus the amount of expansion of the stranded pitch, the elongation of the steel wire is far from enough. Therefore, the wire design for the aluminum-clad steel wire can appropriately increase its pitch ratio, reduce the gap between the aluminum-clad steel wire and aluminum wire elongation, and more play the mechanical properties of the aluminum wire. In short, aluminum wire elongation + due to pitch elongation = steel wire elongation.
Third, from the arrangement of the structure of the single line, elongation is greater in the outermost layer of the arrangement.
The test proves that most of the single-line fracture is broken in the outermost layer. The elongation of the outermost layer is also a key factor affecting the overall braking force. When the strength of a single wire is certain, the higher the elongation, the higher the strength of the single wire mechanical properties can be maximized.
The vast majority of the current performance of the wire is not fully played out, the margin is large, the process is a long process of figuring out, needs a lot of experiments and data analysis, here is just a concept, heavy in practice. In short, in the design of products, the ultimate goal is in the wire elongation to 1%, all the single lines can play to the best effect so that the overall performance of the wire will be a great improvement.
