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Ultra-high voltage direct current power cable

A power cable, ultra-high voltage technology, applied in the field of ultra-high voltage DC power cables, can solve the problems of electric field distortion, dielectric breakdown, space charge accumulation, cable insulation layer, etc.

Active Publication Date: 2020-01-14
LG CABLE LTD (KR)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the polyolefin resin has a linear molecular chain structure, so that it is applied to the cable insulation layer through a cross-linking process to improve mechanical and thermal properties, and cross-linking must occur due to the decomposition of the cross-linking agent during the cross-linking process. Under the influence of by-products, there is the problem of space charge accumulation in the cable insulation layer, and said space charge may distort the electric field in the (EHVDC cable insulation), resulting in a dielectric breakdown voltage lower than the original design. Dielectric breakdown caused by voltage

Method used

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manufacture example

[0073] As a model cable comprising an inner semiconductive layer, an insulating layer, and an outer semiconductive layer, an insulation thickness of about 4mm, and a conductor cross-sectional area of ​​about 400SQ, the model cables of the examples and the comparative examples were manufactured respectively, and the examples and comparative examples The model cable adjusts the content of the cross-linking agent added to the insulating layer, and adjusts the content of the cross-linking by-products through cross-linking and degassing, thereby adjusting the thickness of the insulating layer to three as shown in Table 1 below. Contents of each crosslinked byproduct of each layer / crosslinked byproduct of the inner layer, middle layer, and outer layer divided into equal parts. The content of the cross-linked by-products is measured by collecting a sample at any part in the middle of each layer.

[0074] [Table 1]

[0075]

[0076] 2. Determination of the electric field enhanceme...

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Abstract

The present invention relates to an ultra-high voltage direct current power cable. Specifically, the present invention relates to an ultra-high voltage direct current power cable enabling the simultaneous prevention or minimization of electric field distortion, DC dielectric strength degradation and impulse breakdown strength degradation caused by the accumulation of space charge in an insulator.

Description

technical field [0001] The invention relates to an ultra-high voltage direct current power cable. Specifically, the present invention relates to an ultra-high voltage direct current power cable capable of simultaneously preventing or minimizing electric field distortion and reduction in direct current dielectric strength due to space charge accumulation in an insulator and a reduction in pulse damage intensity. Background technique [0002] In general, in large-scale power systems that require large-capacity and long-distance transmission, high-voltage transmission that increases transmission voltage is required from the viewpoint of reducing power loss, problems with construction land, and increasing transmission capacity. [0003] Power transmission methods can be roughly divided into AC power transmission methods and DC power transmission methods, wherein the DC power transmission method refers to the transmission of electric energy in a DC manner. Specifically, the dir...

Claims

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Application Information

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IPC IPC(8): H01B9/02H01B7/02H01B3/30
CPCH01B9/006H01B3/441H01B3/447H01B3/448H01B7/025H01B9/027C08L23/06C08K5/14H01B7/0225
Inventor 郑贤贞南振镐柳政锡梁艺瑟赵珉祥许星益
Owner LG CABLE LTD (KR)
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