Composite special-shaped stranded conductor manufacturing method and conductor

Abstract

A manufacturing method of a composite special-shaped stranded conductor comprises the following steps: 1) manufacturing a round copper single wire for later use; 2) manufacturing a special-shaped single wire for an adjacent inner layer; the radial section of the special-shaped single line is in a sector ring shape; 3) manufacturing a special-shaped single wire for an outer layer; the radial section of the special-shaped single line is in a sector ring shape; (4) taking the round copper single wires prepared in the step (1), regularly arranging and twisting one round copper single wire in the center and the round copper single wires from inside to outside layer by layer according to the area of the conductor, and pressing the round copper single wires into a round pressed conductor through a pressing mold; if the composite special-shaped stranded conductor only has one layer of special-shaped single wires, entering the step 6); otherwise, entering step 5); (5) wrapping the adjacent inner layer prepared in the step (2) outside the circular compressed conductor prepared in the step (4) by using a special-shaped single wire in a twisting manner, and compressing the conductor into a circular conductor through a compressing mold; and 6) wrapping the outer layer prepared in the step 3) outside the circular conductor prepared in the step 5) in a twisted manner by using the special-shaped single wires, and performing compression through a compression mold to obtain a finished product.

Description

technical field [0001] The technical solution specifically relates to a manufacturing method for a composite special-shaped stranded conductor, which belongs to the technical field of power cable conductor manufacturing. This method is suitable for high-voltage, medium-voltage, and low-voltage large-section circular power cable conductors with a nominal cross-sectional area of ​​50mm. 2 ~800mm 2 , used to improve product quality and reduce production costs. Background technique [0002] In the prior art, conductors for cables are extremely common. The conductors are usually made from standard metal monofilaments that are bundled and / or twisted. In the conductor, even after extrusion processing, there will be gaps between the circular monofilaments. The main problems are: [0003] 1. The theoretical value of the conductor cross-sectional area is smaller than the actual value, the outer diameter of the cable is larger, and the amount of material outside the conductor of th...

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Problems solved by technology

[0003] 1. The theoretical value of the cross-sectional area of ​​the conductor is smaller than the actual value, the outer diameter of the cable is larger, and the amount of material outside the conductor of the cable increases;

[0004] 2. Insufficient contact between monofilaments causes increased contact resistance;

[0005] 3. During the extrusion process, the outer wall of the outermost layer of the conductor scrapes with the extrusion die to easily produce burrs, etc. Such defects are likely to cause electric field imbalance caused by cable insulation breakdown and conductor surface discharge;

[0006] 4. Insufficiently dense conductors and terminals are not tightly connected, and the creep resistance performance is not good, which may easily cause heating caused by poor contact

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