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A method for evaluating the working temperature of an overhead conductor steel stranded butt-embedded aluminum crimping

An overhead wire and evaluation method technology, which is applied in the field of crimping steel strands of concentric stranded overhead wires of round wires, can solve problems such as insufficient crimping pressure, damage to the surface of steel wires, and mismatching hardness of steel strands, so as to improve service life, The effect of ensuring stability and reliability

Active Publication Date: 2020-02-04
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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, the steel-cored aluminum stranded wire and the galvanized round wire of the ground wire are concentrically stranded overhead wires (7 strands or 19 strands) steel strands (or aluminum-clad round wires) Concentric stranded overhead conductors (7 strands or 19 strands) steel strands) joints are directly covered by steel pipes with round wires, concentric strands, overhead conductors, and steel strands are hydraulically connected. Mismatch, unreasonable crimping die size, insufficient crimping pressure, prone to defects such as under-pressure, loose strands, over-pressure, steel wire surface damage, etc., resulting in the grip force of the joint not meeting the standard requirements
The operating temperature range after crimping will have a significant impact on crimping and has not been evaluated

Method used

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  • A method for evaluating the working temperature of an overhead conductor steel stranded butt-embedded aluminum crimping
  • A method for evaluating the working temperature of an overhead conductor steel stranded butt-embedded aluminum crimping
  • A method for evaluating the working temperature of an overhead conductor steel stranded butt-embedded aluminum crimping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1: A method for evaluating the working temperature after butt jointing of steel strands of overhead conductors with embedded aluminum crimping, the method is: the safe working temperature range after crimping and forming of steel core splicing tubes:

[0055] Assume that the ambient temperature when the connecting pipe is installed is t 0 , the coefficient of linear expansion of steel core and steel tube is a fe , the coefficient of linear expansion of the embedded aluminum pipe is a al , when the operating temperature is t 1 Time

[0056] Steel core radius expansion

[0057] ΔR t = Ra fe (t 1 -t 0 ) (28)

[0058] Embedded aluminum tube expansion

[0059] Δd alt = d al a al (t 1 -t 0 ) (29)

[0060] Expansion of inner diameter of steel pipe

[0061] Δr fet = r fe a fe (t 1 -t 0 ) (30)

[0062] safe temperature

[0063] When the temperature rises:

[0064]

[0065] That is, the increase in operating temperature of the connecting pipe sh...

Embodiment 2

[0097] Embodiment 2: as Figure 1-Figure 5 As shown in the figure, an overhead conductor with 7 twisted steel strands butt joint aluminum embedded crimping structure, including steel pipe 1 and aluminum alloy pipe 2, the aluminum alloy pipe 2 is embedded in the steel pipe 1, and wraps two butt-connected round wire concentric stranded overhead conductors 7 twisted steel strands 3 are crimped to the steel pipe 1 so that the aluminum alloy tube 2 closely fits the round wire concentric strand overhead conductor and the 7 twisted steel strands 3 form a steel core connecting pipe.

[0098] The steel pipe 1 and the aluminum alloy pipe 2 have the same length, and both have a pitch of two steel core strands.

[0099] A layer of aluminum alloy tube is added between the steel tube and the 7 strands of the round wire concentric strand overhead conductor, and the high plasticity and high static friction coefficient of the aluminum alloy tube are used to avoid the 7 strands of the steel tub...

Embodiment 3

[0100] Embodiment 3: A crimping method for butt jointing of 7 stranded steel strands of overhead conductors to an aluminum-embedded crimping structure, the method comprising the following steps:

[0101] 1) Embedding the aluminum alloy tube into the steel tube;

[0102] 2) Insert the 7 stranded steel strands of the two butt-connected round wire concentric stranded overhead conductors from both ends of the aluminum alloy tube to ensure that the insertion depth of the 7 stranded steel strands of the two round concentric stranded overhead conductors is equal;

[0103] 3) The steel pipe is crimped with a crimping die, so that the aluminum alloy tube closely fits the surface of the 7 stranded steel strands of the round concentric stranded overhead conductor and fills the gap between the steel pipe and the 7 stranded steel strands of the round concentric stranded overhead conductor to form a steel Core connection tube.

[0104] A new type of round wire concentric stranded overhead ...

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Abstract

The invention discloses a method for evaluating the working temperature of an overhead conductor steel strand after butt joint and embedded aluminum crimping. The method comprises the following stepsof: obtaining a safe working temperature range of a steel core splicing sleeve after compression molding,the radius expansion amount of the steel core is calculated; the embedded aluminum pipe is expanded; steel pipe inner diameter expansion amount, therefore, the increase amount when the temperature rises and the temperature decrease amount when the temperature drops are calculated. According tothe method, the reasonable action range is obtained by performing temperature evaluation on the crimping head obtained after butt joint and aluminum embedding crimping of the steel strand of the overhead conductor, so that the working stability and reliability of the crimping head are ensured, and meanwhile, the service life of the crimping head is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of crimping steel strands of round wire concentric strands and overhead conductors, and in particular relates to a method for evaluating the working temperature of steel strands of overhead conductors after butt jointing and crimping embedded aluminum. Background technique [0002] In the traditional connection process of overhead conductors and ground wires in power transmission and transformation projects, the steel-cored aluminum stranded wire and the galvanized round wire of the ground wire are concentrically stranded overhead conductors (7 strands or 19 strands) steel strands (or aluminum-clad round wires) Concentric stranded overhead conductors (7 strands or 19 strands) steel strands) joints are directly covered with steel pipes with round wires, concentric strands, overhead conductors and steel strands are hydraulically connected, if steel pipes and round wires are connected with concentric strands Mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
Inventor 张仁奇祝贺王凌旭樊磊何锦航王潇张义钊刘雨菲张瑾王璐杨慧民
Owner GUIZHOU POWER GRID CO LTD