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With the continuous upgrading of the power system, various new products have emerged, such as steel core aluminum stranded wire, aluminum clad steel core aluminum stranded wire, 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 always been a major issue
that plagues the design of overhead stranded wire products.
The rated tensile breaking force of the conductor is calculated based on the strength of all aluminum single wires and reinforcements
.
However, the actual tensile breaking force will have a certain deviation from the real calculated value, and the main reason is that the strength of each single wire is not fully utilized
.
Therefore, when designing a product, it is necessary not only to meet its minimum strength requirements, but also to consider how to dig out the strength of each single line
.
Not only is it a full use of the material, but the overall performance of the wire will also be greatly improved
.
You can start
from the following aspects.
First, from the strength, adjust the uniformity
of each single line.
Each single wire has a different
degree of bearing on stress according to its strength.
Just as a tensile force transducer has an optimal tensile range, exceeding its range will not only damage the device, but also cause deviations in the data
.
The same is true of aluminum single wires, and the bearing degree of stress of aluminum single wires of different strengths is also different
.
When these single wires with large strength deviation are twisted together, the stress is evenly distributed to each single line, and the single wire with low strength will break in advance due to the lack of bearing degree, and the single wire with high strength cannot play its role
.
Therefore, the strength range is an important parameter to test the performance utilization of
machinery.
Second, adjust the size of
the elongation and pitch ratio from the elongation and pitch ratio.
The elongation of the steel wire also has a great
influence on the overall tensile properties.
A large number of experiments have proved that the overall tensile breaking force of the aluminum stranded wire with aluminum clad steel core is easy to appear unqualified
.
The main reason is because the elongation of aluminum-clad steel is too small
.
The utilization rate of the mechanical properties of aluminum wire is too low
.
When the aluminum wire is stranded, the smaller the pitch, the better
its ductility.
The higher
the elongation requirements for 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 expansion of the stranded pitch, the elongation of the steel wire is far from enough
.
Therefore, the wire design of aluminum-clad steel wire can appropriately increase its pitch ratio, reduce the gap between the elongation of aluminum-clad steel wire and aluminum wire, and give more play to the mechanical properties
of aluminum wire.
In summary, aluminum wire elongation + elongation due to pitch = steel wire elongation
.
Third, starting from the arrangement structure, the single line with a large elongation is arranged in the outermost layer
.
Tests have shown that most single-line faults are faulted in the outermost layer
.
The elongation of the outermost layer is also a key factor
affecting the overall tensile breaking force.
When the single-line strength is constant, the higher the elongation, the single-line mechanical properties with high strength can be maximized
.
At present, the performance of most of the wires has not been fully exerted, the margin is very large, this process is a long-term exploration process, requiring a lot of experiments and data analysis, here is just a concept, focus on practice
.
In short, when designing a product, the ultimate goal is that when the wire is elongated to 1%, all single wires can perform optimally, so that the overall performance of the wire will be greatly improved
.
With the continuous upgrading of the power system, various new products have emerged, such as steel core aluminum stranded wire, aluminum clad steel core aluminum stranded wire, 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 always been a major issue
that plagues the design of overhead stranded wire products.
The rated tensile breaking force of the conductor is calculated based on the strength of all aluminum single wires and reinforcements
.
However, the actual tensile breaking force will have a certain deviation from the real calculated value, and the main reason is that the strength of each single wire is not fully utilized
.
Therefore, when designing a product, it is necessary not only to meet its minimum strength requirements, but also to consider how to dig out the strength of each single line
.
Not only is it a full use of the material, but the overall performance of the wire will also be greatly improved
.
You can start
from the following aspects.
First, from the strength, adjust the uniformity
of each single line.
Each single wire has a different
degree of bearing on stress according to its strength.
Just as a tensile force transducer has an optimal tensile range, exceeding its range will not only damage the device, but also cause deviations in the data
.
The same is true of aluminum single wires, and the bearing degree of stress of aluminum single wires of different strengths is also different
.
When these single wires with large strength deviation are twisted together, the stress is evenly distributed to each single line, and the single wire with low strength will break in advance due to the lack of bearing degree, and the single wire with high strength cannot play its role
.
Therefore, the strength range is an important parameter to test the performance utilization of
machinery.
Second, adjust the size of
the elongation and pitch ratio from the elongation and pitch ratio.
The elongation of the steel wire also has a great
influence on the overall tensile properties.
A large number of experiments have proved that the overall tensile breaking force of the aluminum stranded wire with aluminum clad steel core is easy to appear unqualified
.
The main reason is because the elongation of aluminum-clad steel is too small
.
The utilization rate of the mechanical properties of aluminum wire is too low
.
When the aluminum wire is stranded, the smaller the pitch, the better
its ductility.
The higher
the elongation requirements for 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 expansion of the stranded pitch, the elongation of the steel wire is far from enough
.
Therefore, the wire design of aluminum-clad steel wire can appropriately increase its pitch ratio, reduce the gap between the elongation of aluminum-clad steel wire and aluminum wire, and give more play to the mechanical properties
of aluminum wire.
In summary, aluminum wire elongation + elongation due to pitch = steel wire elongation
.
Third, starting from the arrangement structure, the single line with a large elongation is arranged in the outermost layer
.
Tests have shown that most single-line faults are faulted in the outermost layer
.
The elongation of the outermost layer is also a key factor
affecting the overall tensile breaking force.
When the single-line strength is constant, the higher the elongation, the single-line mechanical properties with high strength can be maximized
.
At present, the performance of most of the wires has not been fully exerted, the margin is very large, this process is a long-term exploration process, requiring a lot of experiments and data analysis, here is just a concept, focus on practice
.
In short, when designing a product, the ultimate goal is that when the wire is elongated to 1%, all single wires can perform optimally, so that the overall performance of the wire will be greatly improved
.