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Corrugated aluminum sheath high-voltage power cable resistant to buffer layer ablation

A high-voltage power, corrugated aluminum technology, used in power cables with shielding/conducting layers, power cables, insulated cables, etc. Effect

Pending Publication Date: 2020-06-16
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST +6
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, patents CN201820943736.6 and CN201720878994.6 propose a new structure of smooth aluminum sheath to solve such problems, but it has not been widely used in power systems due to the limitation of manufacturing process, site construction and water blocking function requirements.

Method used

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  • Corrugated aluminum sheath high-voltage power cable resistant to buffer layer ablation
  • Corrugated aluminum sheath high-voltage power cable resistant to buffer layer ablation
  • Corrugated aluminum sheath high-voltage power cable resistant to buffer layer ablation

Examples

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Effect test

Embodiment 1

[0067] An embodiment of the present invention provides a corrugated aluminum sheathed high-voltage power cable resistant to ablation of the buffer layer, including: a conductor 1, a shielding layer 2, an insulating layer 3, an insulating shielding layer 4, and a buffer layer that are sequentially arranged on the surface of the conductor from inside to outside 5. Semi-conductive pad 6, corrugated aluminum sheath 7, anti-corrosion asphalt layer 8, non-metallic sheath 9 and graphite layer 10.

[0068] In the present embodiment, in order to realize electrical compatibility between the semiconductive spacer 6 and the cushioning layer 5, its cushioning layer 5 is made of polyester fiber nonwoven fabric 51 with conductive carbon powder, stick-coated polyacrylate expansion powder (resistor) Gouache) 52, semi-conductive fluffy cotton 53 and metal filament 54 constitute.

[0069] Wherein the metal filament 54 is intertwined between the polyester fiber non-woven fabric 51 with conductive...

Embodiment 2

[0077] On the basis of Embodiment 1, the semiconductive spacer 6 is located between the insulating shielding layer 4 and the buffer layer 5 in the cable structure in a tangential direction.

[0078] Typically, the resistivity of the insulating shielding layer 4, the semiconducting spacer 6 and the buffer layer 5 can be controlled to be 10 2 Ω·m, achieve electrical compatibility, and its buffer layer 5 can also be made of polyester fiber nonwoven fabric 51 with conductive carbon powder, sticky coated polyacrylate expansion powder (water-blocking powder) 52, and semi-conductive fluffy cotton 53 .

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Abstract

The invention relates to a corrugated aluminum sheath high-voltage power cable resistant to buffer layer ablation. The allowable separation contact distance between a corrugated aluminum sheath and aninsulation shielding layer is obtained through calculation by combining the structure and material parameters of the cable and is used as the maximum distance between the semi-conductive cushion blocks. The problem of cable faults caused by ablation of the cable buffer layer is solved on the basis of not changing the original structure and material of the cable. Materials of the semi-conductive cushion blocks are easy to obtain. The structure is simple, and the water blocking function of the buffer layer is reserved. Due to structural interference fit of the semi-conductive cushion blocks, water can be effectively prevented from diffusing in the cable, and the dual water blocking function is achieved. By controlling the thickness of the semi-conductive cushion blocks, the bending performance of the cable is not influenced, and the compression damage resistance of the cable can be improved to a certain extent.

Description

technical field [0001] The invention relates to the technical field of cable design, in particular to a high-voltage power cable with a corrugated aluminum sheath resistant to ablation of a buffer layer. Background technique [0002] The technological level of my country's power cable insulation manufacturing has reached the world's advanced level. With the wide application of high-voltage corrugated aluminum sheathed high-voltage power cables with a buffer layer structure, the number of failures is on the rise. Among them, the insulation shock caused by buffer layer ablation Wear-through faults are one of the more typical faults. The faults involve different manufacturers and occur all over the country. According to the preliminary analysis of more than ten body breakdown faults and defects recorded in the literature, it is found that the fault phenomena are highly consistent. The insulation breakdown fault caused by the discharge ablation of the cable buffer layer is the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/18H01B7/282H01B9/02
CPCH01B7/1875H01B7/2825H01B9/02H01B9/027Y02A30/14
Inventor 张静宋鹏先杨旭王浩鸣李文杰赵欣宇齐伟强朱戎房晟辰皮本熙任志刚
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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