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Intermediate connection system for ultra-high-voltage direct current power cable

A power cable and connection system technology, applied in the field of intermediate connection systems, can solve problems such as electric field distortion, dielectric breakdown, and electric field distortion of insulating materials

Active Publication Date: 2020-01-17
LG CABLE LTD (KR)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 properties and thermal properties. Under the influence of by-products, there is a 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 the voltage
[0007] Also, such (ultra) high voltage direct current transmission cables are laid by being connected to each other in units of tens to hundreds of meters through an intermediate connection portion, the crosslinking agent of the insulating material provided in the intermediate connection portion is also in the crosslinking process Under the influence of the cross-linking by-products inevitably produced by the decomposition of the medium, space charges accumulate in the insulating material, which may distort the electric field in the insulating material, thereby lowering the original design of the intermediate connection. The dielectric breakdown voltage causes dielectric breakdown at a voltage of

Method used

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  • Intermediate connection system for ultra-high-voltage direct current power cable
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  • Intermediate connection system for ultra-high-voltage direct current power cable

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manufacture example

[0098] Cable insulation samples were manufactured separately, the thickness of the cable insulation samples was about 120 μm, after cross-linking according to the content of cross-linking agent and the adjustment of degassing time, the various cross-linking by-products of each layer / cross-linking by-product The content of the product was adjusted as shown in Table 1 below.

[0099] [Table 1]

[0100]

[0101] 2. Manufacturing example of insulating layer sample of intermediate connection part

[0102] Each layer / cross-linked by-product of each layer / cross-linked by-products was manufactured separately after cross-linking according to the content of the cross-linking agent and the adjustment of the degassing time. The contents of various cross-linked by-products were adjusted as shown in Table 2 below.

[0103] [Table 2]

[0104]

[0105] 2. Evaluation of physical properties

[0106] 1) Determination of the electric field enhancement factor (FEF) of the cable insulatio...

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Abstract

The present invention relates to an intermediate connection system for an ultra-high-voltage direct current power cable. Particularly, the present invention relates to an intermediate connection system for an ultra-high-voltage direct current power cable, capable of simultaneously preventing or minimizing electric field distortion, deterioration of a direct current dielectric strength, and deterioration of an impulse breakdown strength, which are caused by accumulation of space charges within an insulating layer of a cable and within an insulating material of an intermediate connection part.

Description

technical field [0001] The invention relates to an intermediate connection system of an ultra-high voltage DC power cable. Specifically, the present invention relates to an intermediate connection system of an ultra-high voltage direct current power cable, which can simultaneously prevent or minimize faults caused by cables in the intermediate connection system of an ultra high voltage direct current power cable. The electric field distortion caused by the accumulation of space charge in the insulating material of the insulating layer and the intermediate connection part, the reduction of the DC dielectric strength and the reduction of the pulse destruction strength. 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 capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/00H01B9/02H01B7/02H01B3/30
CPCH01B9/006H02G15/18H01R4/70H02G15/107H01B3/441H02G1/14H01B7/009H01B9/027H01B7/02H01B3/30H01R4/12
Inventor 李守俸郑义焕李旭珍洪成杓曺承佑
Owner LG CABLE LTD (KR)
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