Sparsely twisted type expanded lead

A technology of expanding diameter wire and aluminum wire, applied in the field of sparsely twisted diameter expanding wire, can solve the problems of poor structural stability of the wire, increase the overall weight of the wire, uneven distribution of the sparse winding layer, etc., and achieve simple structure and internal space stability. The effect of improving and reducing weight

Active Publication Date: 2013-01-30
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defects of the hollow expanded diameter wire include: firstly, it cannot withstand high tensile force, and at the same time, due to the inconsistency of the hardness of the steel wire and the aluminum wire, it is difficult to twist, and the resilience of the steel wire will lead to the instability of the wire structure; secondly, because of the use of steel wire, Increase the overall weight of the wire, and at the same time increase the gravity on the tower
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Method used

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  • Sparsely twisted type expanded lead
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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0045] Embodiment 1, when the diameter-expanding wire adopts the structure of a round wire:

[0046] as attached image 3 As shown in the diameter-expanding wire of the round wire structure, the inner layer 2 is a single-layer structure, and the middle layer 3 is at least one layer structure; the inner layer 2 and the middle layer 3 have a diameter of D 1 and D 2 The wire is twisted, where D 2 1. D 1 D. 2 Type or D 1 D. 2 D. 2 Type, that is, the wire adopts a combination structure of large and small wires, or a combination structure of large and small wires. The staggered distribution structure of wires with different diameters enables the wires to achieve a larger diameter expansion rate and reduce corona loss. At the same time, the internal space stability of the wires is improved. After the critical tension test, there is no obvious indentation on the inner layer, which solves the problem of unstable wire expansion due to excessive gaps.

[0047] The outer layer 4...

Example Embodiment

[0050] Embodiment 2, when the expanded-diameter wire adopts a "T"-shaped wire structure:

[0051] as attached Figure 4 As shown in the "T" type wire structure expansion wire, the inner layer 2 is a single-layer structure, and the middle layer 3 is at least one layer structure; the height of the inner layer 2 and the middle layer 3 is H 1 and H 2 The "T"-shaped wire is twisted, and the height of the "T"-shaped wire is the length of the aluminum wire along the radial direction of the expanded diameter wire, H 2 1 . h 1 The cross-sectional area of ​​the wire is S 1 , H 2 The cross-sectional area of ​​the wire is S 2 , where S 2 1 . H 1 h 2 Type or H 1 h 2 h 2 Type, that is, the wire adopts a combination structure of large and small wires, or a combination structure of large and small wires. Conductors with different heights adopt a staggered distribution structure, which enables the conductors to achieve a larger diameter expansion rate and reduce corona loss. At t...

Example Embodiment

[0055] Example 3

[0056] The diameter-expanding wire can also adopt the round wire structure of the inner layer 2 and the middle layer 3, and the "T" wire structure of the outer layer 4. The wire size on the same circumference of the outer layer 4 must be consistent. Figure 5 As shown, the layout of the wires in the inner layer 2 and the middle layer 3 is the same as that in Embodiment 1.

[0057] In order to increase the calculated breaking force of the wire, the aluminum alloy wire with higher strength is used for the single wire. The expanded diameter conductor of this structure adopts high-strength aluminum alloy wire, which effectively reduces the weight of the conductor, and at the same time achieves the tensile force through the performance of the aluminum alloy itself, without the need for reinforced steel, and the conductor has no hysteresis loss during operation, which improves the performance of the conductor. delivery efficiency.

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Abstract

The invention aims at providing a sparsely twisted type expanded lead which can achieve large expansion rate and solves the problem of strand-jumping caused by poor structural stability of a lead. The lead sequentially comprises a core layer, an inner layer, an middle layer and an outer layer from inside to outside, the core layer is formed by twisting and winding steel wires, the inner layer and the outer layer are of single-layer structures, the middle layer is of at least one-layer structure, the inner layer and the middle layer are formed by twisting and winding round linear leads with diameter of D1 and D2 or T-shaped leads with height of H1 and H2, and the outer layer is formed by twisting and winding round linear leads with diameter of D1 and D2 or T-shaped leads with height of H1 or H2, wherein D2 is smaller than D1, and H2 is smaller than H1. The inner layer, the middle layer and the outer layer are formed by twisting and winding aluminum wires, the adjacent layers of the aluminum wires are stranded reversely, and the outermost layer is stranded towards the right direction. Compared with a common twisting and winding wire, strand-jumping critical tension of the sparsely twisted type expanded lead is improved, the inner layer has no remarkable indentation after a critical tension test is performed on the expanded lead, and the problem of instability of the expanded lead caused by excessive gaps is resolved.

Description

technical field [0001] The invention belongs to the field of conductors of overhead power transmission lines, and in particular relates to a sparsely twisted wire with expanded diameter. Background technique [0002] When the transmission line is in a high-voltage state or a high-altitude geographical location, the electric field, magnetic field, audible noise and radio interference level of the overhead line will exceed the relevant requirements. Therefore, if the design uses ordinary wires, such as the attached figure 1 As shown in the schematic diagram of the steel-reinforced aluminum stranded wire, it is necessary to increase the cross-section of the conductor and the number of splits of the conductor, which will inevitably increase the use of the conductor, the structural size of the iron tower, and the width of the line corridor, thereby increasing the project investment. Wasted. [0003] Expanded wires have a larger diameter and better electrical performance than wir...

Claims

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Application Information

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IPC IPC(8): H01B5/10H01B1/02H01B9/00
Inventor 牛海军朱宽军刘彬司佳钧刘臻
Owner CHINA ELECTRIC POWER RES INST
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