A crimping method for butt jointing of 19 stranded steel strands with embedded aluminum in overhead conductors

Abstract

The invention discloses a method for embedded aluminum crimping of 19 steel strand wires of an overhead conductor, the method comprises a steel pipe (1) and an aluminum alloy pipe (2), and the aluminum alloy pipe (2) is embedded in the steel pipe (1) and 19 stranded steel strand wires (3) of two butt-joined round wire concentric stranded overhead conductors are wrapped, and the steel pipe (1) is crimped to make the aluminum alloy pipe (2) closely fit the 19 stranded steel strand wires (3) of the round wire concentric stranded overhead conductors to form a steel core connecting pipe. A layer ofaluminum alloy pipe is added between the steel pipe and the 19 stranded steel strand wires of the round wire concentric stranded overhead conductors, based on the high plasticity and static frictioncoefficient of the aluminum alloy pipe, the 19 stranded steel strand wires of the round wire concentric stranded overhead conductors are prevented from being crushed, under-pressed, and loosened whenthe 19 stranded steel strand wires of the round wire concentric stranded overhead conductors and the steel pipe are crimped. The crimping of the 19 stranded steel strand wires of the round wire concentric stranded overhead conductors is easier to implement, and the crimping quality is higher. The crimping joints can avoid non-destructive testing and labor intensity and engineering cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of crimping of 19 stranded steel strands of round concentric stranded overhead conductors, and in particular relates to a crimping method for butt jointing of 19 stranded steel strands of overhead conductors with embedded aluminum. Background technique [0002] In the traditional connection process of overhead wires and ground wires in power transmission and transformation projects, 19 stranded steel stranded wires (or 19 concentric stranded overhead wires of aluminum-clad round wires) Stranded steel strands) joints are directly covered by steel pipes with 19 stranded steel strands of round concentric stranded overhead conductors and hydraulically connected. Unreasonable size and insufficient crimping pressure are prone to defects such as undervoltage, loose strands, overpressure, and steel wire surface damage, resulting in the gripping force of the joint not meeting the standard requirements. Among the fac...

AI Technical Summary

Problems solved by technology

[0002] In the traditional connection process of overhead wires and ground wires in power transmission and transformation projects, 19 stranded steel stranded wires (or 19 concentric stranded overhead wires of aluminum-clad round wires) Stranded steel strands) joints are directly covered by steel pipes with 19 stranded steel strands of round concentric stranded overhead conductors and hydraulically connected. Unreasonable size and insufficient crimping pressure are prone to defects such as undervoltage, loose strands, overpressure, and steel wire surface damage, resulting in the gripping force of the joint not meeting the standard requirements

Among the factors that cause the crimping defect of the round wire concentric strand overhead conductor 19 strands of the steel cored aluminum stranded wire and the ground wire, the hardness mismatch between the steel pipe and the round wire concentric strand overhead conductor 19 strands is the most unavoidable Yes, in the production process of 19 stranded steel strands for concentric stranded overhead conductors of aluminum-clad round wires, the cold-drawn steel wires pass through the liquid aluminum plating, which is equivalent to tempering once, and the hardness of the cold-drawn steel wires decreases, resulting in the concentric stranded overhead wires of the round wires. The hardness of the 19 stranded steel strands of the conductor is lower than that of the steel pipe. When crimping, the inner wall of the steel pipe bites the round wire and the 19 stranded steel stranded wires of the overhead conductor, resulting in a decrease in the gripping force of the joint.

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