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High-voltage cable capable of regulating and controlling breakdown field strength

A technology for high-voltage cables and breakdown field strength, which is applied in the direction of power cables, power cables with shielding layers/conductive layers, insulated cables, etc., and can solve problems such as lowering the operating level of cables, limited improvement range, and long industrialization cycle. Achieve the effect of avoiding PTC effect, increasing voltage level and reducing production cost

Active Publication Date: 2021-06-11
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inner semi-conductive shielding layer is used as the middle part connecting the metal core and the outer semi-conductive shielding layer, filling the gap between the two parts, but due to the existence of interface defects, discharges are prone to occur, thereby reducing the operating level of the cable
Improve the withstand breakdown field strength of the insulating layer by changing the material, but the improvement range is limited, and the industrialization period for mass production is long

Method used

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  • High-voltage cable capable of regulating and controlling breakdown field strength
  • High-voltage cable capable of regulating and controlling breakdown field strength
  • High-voltage cable capable of regulating and controlling breakdown field strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Such as figure 2 As shown, this embodiment provides a high-voltage cable with adjustable breakdown field strength, which includes a core 1 and an insulating layer 2. There is no inner semi-conductive shielding layer between the core 1 and the insulating layer 2, and the insulating layer 2 is divided into The inner boundary area 21 opposite to the wire core 1, the outer area, and the inner area 23 between the two parts, the inner boundary area has a first nanoporous structure 41, and the nanopores 401 in the first nanoporous structure 41 The extension direction is perpendicular to the cable extension direction. The outer region 22 of the insulating layer has a second nanoporous structure 42, and the extending direction of the nanoholes 401 in the second nanoporous structure 42 is perpendicular to the extending direction of the cable. The inner region 23 of the insulating layer has a third nanohole structure 43, and the extension direction of the nanoholes 401 in the th...

Embodiment 2

[0056] Compared with Embodiment 1, the high-voltage cable with adjustable breakdown field strength provided by this embodiment is different in that the first nanoporous structure 41, the second nanoporous structure 42 and the third nanoporous structure 43 are arranged in layers , and the nanoporous structure is composed of multi-layer nanoporous structures, and each layer of nanoporous structures is bonded to each other; the axial direction of the nanoholes 401 in the first nanoporous structure 41 is approximately perpendicular to the outer surface of the wire core 1, and the second nanoporous structure The axial direction of the nanoholes 401 in the hole structure 42 is approximately perpendicular to the outer surface of the insulating layer 2 ; and the nanoholes 401 between the nanohole structures of each layer are arranged in a dislocation manner.

[0057] Such as Figure 4 As shown, it is a schematic structural diagram of the insulating layer of the high-voltage cable with...

Embodiment 3

[0059] The structure of the high-voltage cable provided in this embodiment is the same as in Embodiment 2, the difference is that the medium contained in the nanopores 401 of the first nanoporous structure 41, the second nanoporous structure 42 and the third nanoporous structure 43 is mineral oil , the diameters of the nanopores 401 are inconsistent, and the maximum value of the diameter d1 of the nanopores 401 is 300 nm.

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Abstract

The invention provides a high-voltage cable capable of regulating and controlling breakdown field strength. The high-voltage cable comprises a wire core and an insulating layer, an inner semi-conductive shielding layer is not arranged between the wire core and the insulating layer, the inner boundary area of the insulating layer is provided with a first nano-pore structure, and the extension direction of nano-pores in the first nano-pore structure is perpendicular to the extension direction of the cable. According to the high-voltage cable provided by the invention, the inner semi-conductive shielding layer is not arranged, the inner interface, opposite to the wire core, on the insulating layer is provided with the nano-pore structure with the nano-scale pore diameter, and the nano-pore structure can effectively prevent discharge, so that the breakdown-resistant field strength of the cable is greatly improved, and the voltage grade of the cable is improved.

Description

technical field [0001] The application belongs to the technical field of high-voltage power transmission, and in particular relates to a high-voltage cable with adjustable breakdown field strength. Background technique [0002] The safe operation of XLPE high-voltage cables is crucial to the stability of the entire power system, but with the increase of voltage levels, the breakdown strength of cables needs to be improved urgently. Such as figure 1 As shown, in the prior art, the XLPE high-voltage cable structure is from the inside to the outside, followed by the core 1, the inner semi-conductive shielding layer 4, the insulating layer 2, and the outer semi-conductive shielding layer 3. The breakdown strength of the cable is largely determined by the insulating layer 2 and its matching with the inner semi-conductive shielding layer 4 . The inner semi-conductive shielding layer serves as the middle part connecting the metal core and the outer semi-conductive shielding layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/02H01B9/02
CPCH01B9/021H01B7/0225Y02A30/14
Inventor 魏艳慧李国倡杨晶晶顾振鲁郝春成雷清泉
Owner QINGDAO UNIV OF SCI & TECH
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