Preparation method of high-density compact round aluminum conductor for cables

Abstract

Provided is a preparation method of a compressed circular aluminum conductor with high outer layer compactness used for an electric cable. The aluminum conductor comprises a center layer and a peripheral layer, wherein the center layer is of a circular structure and formed by a plurality of aluminum single lines with one aluminum single line as a center, and the peripheral layer comprises at least two layers. The aluminum conductor is prepared by using a limit compressing method, wherein the aluminum single lines with elongation between 12%-15% are selected, a crystal combination mold or a diamond coating mold is used as a compressing mold, layered compressing is adopted, when a secondary outer layer and an outermost layer are compressed, the compressed volume of the secondary outer layer is decreased, compressed coefficient design value of the secondary outer layer is reduced to 0.86, the compressed volume of the outermost layer is increased to approach a limit compressed volume, accordingly compressed coefficient theoretical calculating value of the outermost layer reaches 0.94, grooves with the size similar to the diameter of the single line are formed on the surface of a shaped secondary outer layer, an outer layer single line is enabled to have a certain embedding volume, an overall compressed coefficient of an obtained aluminum conductor reaches 0.9, and the compressed coefficient of the outer layer single line reaches above 0.92. By using the preparation method, outer layer compactness of the aluminum conductor is improved, and a filling coefficient of the aluminum conductor is guaranteed to be high.

Description

technical field [0001] The present invention relates to cables, in particular to circular aluminum conductors for cables. Background technique [0002] Compressed aluminum core conductors are widely used in power cables, but in the production of compressed aluminum core conductors, problems of loose outer layers and loose gaps are prone to occur. Especially over 240mm 2 The large cross-section tightly pressed aluminum core conductor is prone to the problem that the outer layer of the conductor is loose. In the past, the compaction coefficient of each layer was mainly considered in the design of compacted conductors. In structural design, the method of increasing the compaction amount layer by layer is generally adopted. The compaction coefficient of each layer is 84% ​​to 90%. Generally, it is increased layer by layer from the inside to the outside. , the compression coefficient reaches about 90% in the outermost layer. This design method only considers the deformable amo...

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Problems solved by technology

This design method only considers the deformable amount of aluminum single wire of each layer, which has great limitations

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