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A crimping method for 19 stranded steel-cored aluminum stranded wires of round concentric stranded overhead conductors

A steel-cored aluminum stranded wire and overhead wire technology, applied in the direction of connection, circuit/collector parts, electrical components, etc., can solve problems such as heat generation, joint holding force not meeting standard requirements, and increased contact resistance at the crimping point.

Active Publication Date: 2020-12-25
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the traditional splicing process of overhead conductors in power transmission and transformation projects, the joints of the steel-reinforced aluminum stranded wire and the galvanized steel stranded wire (or aluminum-clad steel stranded wire) of the ground wire are directly covered with steel strands by steel splicing tubes and hydraulically connected. , if the hardness of the steel splicing pipe and the steel strand does not match, the size of the crimping die is unreasonable, and the crimping pressure is insufficient, defects such as undervoltage, loose strands, overpressure, and steel wire surface damage are prone to occur, resulting in the holding force of the joint not meeting the standard Require
Among the factors that cause steel strand crimping defects of steel cored aluminum strand and ground wire, the hardness mismatch between steel splicing pipe and steel strand is the most unavoidable. In the production process of aluminum clad steel strand, cold drawn steel wire The hardness of the cold-drawn steel wire is reduced, resulting in a lower hardness of the steel strand than that of the steel splicing tube. When crimping, the inner wall of the steel splicing tube bites the steel strand wire, resulting in the grip of the joint. Focus on lowering
[0005] (2) It is difficult to guarantee the crimping quality of aluminum connecting pipe
[0008] In winter, when the temperature drops, because the steel core is in the elastic range, the cross section of the steel core becomes thinner, the pressure applied by the steel core to the aluminum strand decreases, and the cross section of the aluminum strand also shrinks, but because the aluminum strand has already undergone yield hardening, The cross-section of the aluminum strands did not expand due to the reduction in pressure, which resulted in gaps between the aluminum strands
[0009] Rainwater, air, dirt, and corrosive media infiltrate the gap between the aluminum strands of the joint, oxidize the surface of the aluminum strands, and generate aluminum oxide, which leads to increased contact resistance and heat generation at the crimping joints of the steel-reinforced aluminum strands. , eventually failing
[0010] In order to solve the problems of damage to the steel core and unstable crimping quality of aluminum splicing tubes that are prone to occur in traditional crimping methods, it is necessary to design a new type of full-tension aluminum-embedded crimping process for steel-reinforced aluminum stranded wire. Twisted wire butt joint crimping is easier to implement, the crimping quality is higher, and the crimping joint can avoid non-destructive testing, reducing labor intensity and engineering costs

Method used

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  • A crimping method for 19 stranded steel-cored aluminum stranded wires of round concentric stranded overhead conductors
  • A crimping method for 19 stranded steel-cored aluminum stranded wires of round concentric stranded overhead conductors
  • A crimping method for 19 stranded steel-cored aluminum stranded wires of round concentric stranded overhead conductors

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Experimental program
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Effect test

Embodiment 1

[0266] Embodiment 1: as Figure 1-15 As shown, a crimping structure of 19 stranded steel-cored aluminum stranded wires with round concentric stranded overhead conductors, including an aluminum connection tube 1, a steel connection tube 2, a steel core connection embedded aluminum tube 3, an inner embedded layer aluminum tube 4, an outer The embedded aluminum tube 5 and the wire setting ring 6, the steel core connecting embedded aluminum tube 3 is sleeved on the two butt-connected steel strands 7, the steel connecting tube 2 is sleeved outside the steel core connecting embedded aluminum tube 3, and the steel core connecting embedded tube 3 is crimped The pipe sleeve 2 enables the steel core to be connected to the embedded aluminum tube 3 to closely fit the steel strand 3 to form a steel strand crimping joint; the inner embedded aluminum tube 4 is placed on the steel strand 7 that is connected to each end of the steel core aluminum strand and the inner Between the layers of alum...

Embodiment 2

[0270] Embodiment 2: A method for crimping 19 stranded steel-cored aluminum stranded wires of round concentric stranded overhead conductors, the method comprising the following steps:

[0271] 1) Cut off the aluminum strands of the steel-reinforced aluminum strands at both ends of the butt joint, and the length of the cut-off section at each end = the length of the steel connecting pipe / 2+20mm;

[0272] 2) Pull the two joints of the steel-cored aluminum stranded wire to 10 meters, put one end of the steel-reinforced aluminum stranded wire into the aluminum connection tube, and move the aluminum connection tube to a position that does not affect the next process;

[0273] 3) Put the steel-cored aluminum stranded wire at one end into the outer embedded aluminum tube. The inner hole of the outer embedded aluminum tube is a stepped hole, and the large inner diameter end is connected to this end, and the outer embedded aluminum tube is moved to a position that does not affect the ne...

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PUM

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Abstract

The invention discloses a round wire concentric stranded overhead conductor 19-strand steel core aluminum stranded wire crimping method. The method comprises steps: butted aluminum stranded wires arefirstly stripped for a certain distance to expose a middle steel stranded wire, and the wire is sleeved with an aluminum splicing sleeve; a steel core aluminum stranded wire passes through an outer embedded aluminum pipe, a wire shaping ring sleeves the steel core aluminum stranded wire, an inner embedded aluminum pipe is inserted between an inner aluminum stranded wire layer and a steel core, andafter the opened aluminum stranded wire is recovered, a steel core splicing aluminum sleeve sleeves steel core wire ends of two butted wires; a full-tension steel splicing sleeve sleeves the steel core splicing aluminum sleeve, and through crimping, the steel core splicing aluminum sleeve is engaged with the steel core; and finally, the aluminum splicing sleeve is moved back to the crimping position, and the crimping enables an inner embedded aluminum pipe and an outer embedded aluminum pipe to be closely fit. The steel core aluminum stranded wire can be prevented against crushing, under pressure and strand loosening, the connection reliability is good, making is easy, the crimping quality is higher, non-destructive testing does not happen, and the labor intensity and the engineering costare reduced.

Description

technical field [0001] The invention belongs to the technical field of butt joints of 19 stranded steel-cored aluminum stranded wires of round concentric stranded overhead conductors, and in particular relates to a crimping method for 19 stranded steel-cored aluminum stranded wires of round concentric stranded overhead conductors. Background technique [0002] The existing steel-cored aluminum stranded wire full-tension splicing tube is mainly composed of a steel crimping tube and an aluminum crimping tube. Then use the aluminum alloy crimping tube to crimp the aluminum alloy splicing tube, aluminum stranded wire and steel stranded wire together. This traditional crimping method is prone to two problems: [0003] (1) The damage to the steel core caused by the crimping of the steel core to the aluminum tube. [0004] In the traditional splicing process of overhead conductors in power transmission and transformation projects, the joints of the steel-reinforced aluminum stran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01R43/00H01R43/048
CPCH01R43/00H01R43/048
Inventor 张仁奇张瑾刘雨菲张义钊
Owner GUIZHOU POWER GRID CO LTD
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