A single-core power cable

A technology for single-core power cables and cable conductors, which is applied to power cables with shielding layers/conductive layers, insulated cables, cables, etc. The main insulation breakdown of the cable and other problems

Active Publication Date: 2020-02-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the structure of a single-core power cable, the metal sheath is usually an aluminum sheath, which usually adopts a corrugated tube structure. In this way, there will be an air gap between the metal sheath and the outer shielding layer and the water-blocking layer, which is prone to external leakage. The floating potential between the shielding layer and the metal sheath further causes a potential difference between the metal sheath and the insulating shielding layer to cause partial discharge. Long-term partial discharge will damage the main insulation of the cable, and even cause the main insulation of the cable to be damaged. Breakdown, causing cable failure

Method used

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  • A single-core power cable

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Embodiment 1

[0026] like figure 1 as shown, figure 1 It is schematically shown that the single-core power cable 100 includes a cable conductor 1 , a conductor shielding layer 2 , an insulating layer 3 , an insulating shielding layer 4 , an inner sheath layer 5 , a water blocking layer 6 and a non-metallic outer sheath layer 7 .

[0027] In the embodiment of the present application, the cable conductor 1 mainly serves as a path for providing load current, that is, conducts electricity.

[0028] The conductor shielding layer 2, the insulating layer 3, the insulating shielding layer 4, the inner sheath layer 5, the water blocking layer 6 and the non-metal outer sheath layer 7 are sequentially arranged along the radial direction of the cable conductor 1 from inside to outside. Specifically, the conductor shielding layer 2 is wrapped on the outer surface 11 of the cable conductor 1, the insulating layer 3 is wrapped on the outer surface of the conductor shielding layer 2, the insulating shield...

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Abstract

The invention relates to the technical field of power cables, and discloses a single-core power cable. The single-core power cable comprises a cable conductor, and a conductor shielding layer, an insulating layer, an insulating shielding layer, an inner sheath layer, a water-resisting layer and a non-metallic outer sheath layer arranged in turn from inside to outside along the radial direction ofthe cable conductor, wherein the inner sheath layer is made of carbon fiber. The single-core power cable has the advantage of effectively avoiding partial discharge due to the air gap between the inner sheath layer and the insulating shielding layer and also has the advantages of reliable electrical performance, good resistance to external destructive force, corrosion resistance and good mechanical performance.

Description

technical field [0001] The invention relates to the technical field of power cables, in particular to a single-core power cable. Background technique [0002] With the rapid development of the national economy and the power industry, power cables are being widely used because they are gradually replacing overhead lines. Power cables with a voltage level of 35kV and above usually use single-core power cables due to manufacturing and construction reasons. [0003] In the structure of a single-core power cable, the metal sheath is usually an aluminum sheath, which usually adopts a corrugated tube structure. In this way, there will be an air gap between the metal sheath and the outer shielding layer and the water-blocking layer, which is prone to external leakage. The floating potential between the shielding layer and the metal sheath further causes a potential difference between the metal sheath and the insulating shielding layer to cause partial discharge. Long-term partial d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B7/02H01B7/17H01B7/18H01B7/28H01B7/282H01B7/295H01B9/02
CPCH01B7/0225H01B7/17H01B7/1875H01B7/2806H01B7/2813H01B7/2825H01B7/295H01B9/02
Inventor 孙进李志远黎德初刘维功李琼时振堂
Owner CHINA PETROLEUM & CHEM CORP
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