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Introduction of Aluminum Alloy Overhead Stranded Wire

Introduction of Aluminum Alloy Overhead Stranded Wire

  • Categories:Industry Focus
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  • Time of issue:2021-12-21
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(Summary description)The load-bearing core + conductor, also known as the reinforcement core, is to add a single-strand wire with higher strength in the center of the stranded wire to withstand the external tensile force, such as steel-cored aluminum stranded wire, aluminum alloy-cored aluminum stranded wire, and aluminum-clad steel-cored aluminum stranded wire. String.

Introduction of Aluminum Alloy Overhead Stranded Wire

(Summary description)The load-bearing core + conductor, also known as the reinforcement core, is to add a single-strand wire with higher strength in the center of the stranded wire to withstand the external tensile force, such as steel-cored aluminum stranded wire, aluminum alloy-cored aluminum stranded wire, and aluminum-clad steel-cored aluminum stranded wire. String.

  • Categories:Industry Focus
  • Author:
  • Origin:
  • Time of issue:2021-12-21 13:09
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Information

There are many types of aluminum alloy overhead strands , but there are actually only three structures. As long as the composition of these three types of structures is mastered, it can be combined with different metal materials. The single metal of the aluminum alloy overhead stranded wire is twisted by a single metal material. For example, aluminum stranded wire is made of stranded aluminum wire, steel stranded wire is made of steel wire, and aluminum stranded wire is made of aluminum single wire.

Introduction of Aluminum Alloy Overhead Stranded Wire

The load-bearing core + conductor, also known as the reinforcement core, is to add a single-strand wire with higher strength in the center of the stranded wire to withstand the external tensile force, such as steel-cored aluminum stranded wire, aluminum alloy-cored aluminum stranded wire, and aluminum-clad steel-cored aluminum stranded wire. String.

Bimetallic wire, such as aluminum-clad steel stranded wire, is formed by combining two metal materials through metallurgical technology, rather than twisting, which is different from steel-cored aluminum stranded wire. The way to attach the metal outer layer is similar to plastic extrusion, different from the way you carry the core and wire.

When applying for the production license of aluminum alloy overhead strands, it should be noted that the type test report should be provided separately according to the above product varieties, and there is no coverage relationship between the varieties. Because: from the perspective of product performance, there is no coverage relationship between the performance of various varieties; from the perspective of certification rules, there is no clear coverage between varieties. For example, when the manufacturer declares, only the test report of the steel core aluminum stranded wire type is provided. Although the scope of permission is marked as "round wire rod", it cannot be considered to include aluminum-clad steel strands or other varieties.

Aluminum alloy overhead stranded wire is an important part of overhead power lines, and its function is to transmit current and electricity. Because they are erected on towers, they are subjected to external loads such as self-weight, wind, snow, ice, etc. , they are also corroded by chemicals in the surrounding air. The cable is required not only to have good electrical properties, but also to have sufficient mechanical strength and corrosion resistance.

Since the overhead cable works under the action of tension (self-weight) for a long time, the elongation caused by the dislocation and slip between the internal crystals of the aluminum alloy overhead stranded wire is called creep, and its creep characteristics change with time. Creep tests are used to determine the structural stability of overhead cables operating under load for long periods of time. According to the creep characteristic curve, the creep rate of the cable and the sag change of the transmission line can be correctly predicted, which provides an important basis for the design and construction of the transmission line and ensures the safe operation of the transmission line.

 

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