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High voltage and ultrahigh voltage flexible direct current transmission optical fiber composite extrusion insulation submarine cable

A flexible DC power transmission and optical fiber composite technology, which is applied in the direction of submarine cables, power cables, and power cables with shielding layers/conductive layers, etc., can solve problems such as pollution, prevent environmental pollution, reduce cable costs, and prevent heavy metal pollution. Effect

Active Publication Date: 2013-05-29
STATE GRID ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the deficiencies of cables in the prior art, the purpose of the present invention is to provide a flexible DC transmission optical fiber composite extrusion insulated submarine cable for high voltage and ultra-high voltage, which can reduce the cost of the cable and improve the breakdown strength of the cable insulation layer and working temperature, to avoid the mechanical damage and heavy metal pollution of traditional submarine cable lead sheaths, and to prevent the production site and related environmental pollution caused by wrapping asphalt hemp rope or asphalt plastic rope as steel wire for anticorrosion of traditional cables

Method used

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  • High voltage and ultrahigh voltage flexible direct current transmission optical fiber composite extrusion insulation submarine cable

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Effect test

Embodiment 1

[0020] This embodiment is a rated voltage ±320 kV flexible direct current transmission optical fiber compound extruded insulated submarine cable.

[0021] (1) The water-blocking conductor 11 is made of pure aluminum with a cross-sectional area of ​​1400 mm 2 , using a stranded circular compact conductor structure or a split conductor structure, and the gap between the conductors is filled with water-blocking materials;

[0022] (2) Semi-conductive Tetoron wrapping tape 12, thickness 0.18 mm;

[0023] (3) Semi-conductive inner shield 13 with a thickness of 1.5 mm;

[0024] (4) The extruded insulating layer 14 is an ultra-clean PE cross-linked material added with a space charge inhibitor, the working temperature is 90°C, the dielectric constant is 2.3, the DC breakdown field strength is greater than 45 kV / mm, and the insulating layer thickness (22~ 24) mm; the mixture of ultra-clean PE crosslinking material and space charge inhibitor is made by melt mixing method;

[0025] (5...

Embodiment 2

[0038] This embodiment is a rated voltage ±200 kV flexible direct current transmission optical fiber compound extruded insulation submarine cable.

[0039] (1) Water-blocking conductor 11, made of aluminum alloy or copper for cable conductors, with a cross-sectional area of ​​1000 mm 2 , using a twisted circular compact conductor structure, the gap between the conductors is filled with water-blocking materials;

[0040] (2) Semi-conductive Tetoron wrapping tape 12, thickness 0.18 mm;

[0041] (3) Semi-conductive inner shield 13 with a thickness of 1.5 mm;

[0042] (4) The extruded insulating layer 14 is an ultra-clean PE cross-linked material added with a space charge inhibitor, the working temperature is 90°C, the dielectric constant is 2.3, the DC breakdown field strength is greater than 45 kV / mm, and the insulating layer thickness (12~ 14) mm; the mixture of ultra-clean PE crosslinking material and space charge inhibitor is made by melt mixing method;

[0043] (5) Semi-c...

Embodiment 3

[0056] This embodiment is a rated voltage ±160 kV flexible direct current transmission optical fiber compound extruded insulation submarine cable.

[0057] (1) Water-blocking conductor 11, made of copper, with a cross-sectional area of ​​500 mm 2 , using a twisted circular compact conductor structure, the gap between the conductors is filled with water-blocking materials;

[0058] (2) Semi-conductive nylon wrapping tape 12, thickness 0.1 mm;

[0059] (3) Semi-conductive inner shield 13, thickness (1.2-1.5) mm;

[0060] (4) The extruded insulating layer 14 is an ultra-clean PE crosslinking material added with a space charge inhibitor, the working temperature is 90°C, the dielectric constant is 2.3, the DC breakdown field strength is greater than 45 kV / mm, and the insulating layer thickness (11~ 13) mm; the mixture of ultra-clean PE crosslinking material and space charge inhibitor is made by melt mixing method;

[0061] (5) Semi-conductive outer shield 15, thickness 1 mm;

...

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Abstract

The invention discloses a high voltage and ultrahigh voltage flexible direct current transmission optical fiber composite extrusion insulation submarine cable. A water-resistant conductor is arranged at the center of the cable. A semiconductive wrapping belt, an extrusion inner shielding layer, an extrusion insulation layer, an extrusion outer shielding layer, a first buffer water-resistant layer, a second buffer water-resistant layer, a metal sleeve, an extrusion inner sheath, an extrusion molding steel wire and an extrusion outer sheath are sequentially wrapped outside the water-resistant conductor. Optical fibers are placed between the buffer water-resistant layers. The insulation layer overcomes the shortcoming of electric field distortion even breakdown caused by space charge accumulation of a traditional cable insulation material. A copper sleeve with good physical performances such as mechanical strength and fatigue strength is adopted to ensure safe reliable running. The submarine cable resolves the problem of heavy metal pollution caused by a lead sleeve utilized in a traditional submarine cable and prevents environment pollution caused by the fact that an asphalt wrapping plastic rope is coated on the surface of a bare steel wire of a traditional submarine cable to serve as a steel wire corrosion-resistant layer by extruding the extrusion molding steel wire and the extrusion outer sheath on the inner sheath.

Description

technical field [0001] The invention relates to a direct current cable suitable for seabed use, in particular to an optical fiber compound extrusion insulated submarine cable for flexible direct current transmission. Background technique [0002] In 1997, the world's first flexible DC cable was put into operation, and the supplier was ABB. With the advancement of technology, the operating voltage level continues to increase. At present, the voltage level of flexible DC cables that have been commercially operated abroad is 200 kV. ABB has completed the type test of 320 kV cables in the laboratory. China's power transmission cables are mostly AC extruded insulated cables, and only once in Shanghai have low-voltage (30 kV and below) flexible DC extruded insulated land cables, while medium-voltage (above 30 kV to 150 kV), high-voltage (above 150 kV) to 250 kV) and EHV (above 250 kV to 500 kV) flexible DC extruded insulated submarine cables have not been used. [0003] In China...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B9/00H01B9/02H01B7/14
Inventor 杨黎明朱智恩杨荣凯杨迎建杜忠东徐林华
Owner STATE GRID ELECTRIC POWER RES INST
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