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HV and EHV Flexible DC Transmission Optical Fiber Composite Extruded Insulated Submarine Cables

A flexible DC power transmission and optical fiber composite technology, applied in submarine cables, power cables, power cables with shielding layers/conducting layers, etc. Effect

Active Publication Date: 2016-02-03
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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  • HV and EHV Flexible DC Transmission Optical Fiber Composite Extruded Insulated Submarine Cables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0021] (1) The water-blocking conductor 11 is made of pure aluminum with a cross-sectional area of ​​1400mm 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 0.18mm;

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

[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 45kV / mm, and the insulating layer thickness (22-24 ) mm; the mixture of ultra-clean PE cross-linking material and space charge inhibitor is made by melt mixing method;

[0025] (5) ...

Embodiment 2

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

[0039] (1) Water-blocking conductor 11, made of aluminum alloy or copper for cable conductors, with a cross-sectional area of ​​1000mm 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 0.18mm;

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

[0042] (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 45kV / mm, and the insulating layer thickness (12-14 ) mm; the mixture of ultra-clean PE cross-linking material and space charge inhibitor is made by melt mixing method;

[0043] (5) Semi-conductive out...

Embodiment 3

[0056] This embodiment is a flexible direct current transmission optical fiber composite extruded insulated submarine cable with a rated voltage of ±160kV.

[0057] (1) The water-blocking conductor 11 is made of copper and has a cross-sectional area of ​​500mm 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 0.1mm;

[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 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 45kV / mm, and the insulating layer thickness (11-13 ) mm; the mixture of ultra-clean PE cross-linking material and space charge inhibitor is made by melt mixing method;

[0061] (5) Semi-conductive outer shield 15, thic...

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Abstract

The invention discloses a high-voltage and ultra-high-voltage flexible direct current transmission optical fiber composite extrusion insulated submarine cable. The center of the cable is a water-blocking conductor, and the water-blocking conductor is coated with a semi-conductive wrapping tape, an extruded inner shielding layer, Extruded insulating layer, extruded outer shielding layer, first buffer water-blocking layer, second buffer water-blocking layer, metal sheath, extruded inner sheath, extruded steel wire and extruded outer sheath; between the buffer water-blocking layer Fiber optics are placed between them. The insulation layer of the present invention overcomes the electric field distortion or even breakdown caused by the accumulation of space charges in traditional cable insulation materials; the selection of copper sleeves with excellent physical properties such as mechanical strength and fatigue strength ensures its safe and reliable operation, and also overcomes the traditional The problem of heavy metal pollution caused by the use of lead sheaths in submarine cables; by wrapping extruded steel wires on the inner sheath and extruding the outer sheath, it avoids the traditional submarine cable coating the surface of bare steel wires with asphalt and wrapping plastic ropes as a steel wire anti-corrosion layer. environmental pollution caused.

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 voltage level of operation has been continuously improved. At present, the voltage level of flexible DC cables in commercial operation abroad is 200kV, and ABB has completed the type test of 320kV cables in the laboratory. China's power transmission cables are mostly AC extruded insulated cables, and only once in Shanghai have low-voltage (30kV and below) flexible DC extruded insulated land cables, while medium-voltage (above 30kV to 150kV), high-voltage (above 150kV to 250kV) and Ultra-high voltage (above 250kV to 500kV) flexible DC extruded insulated submarine cables have not yet been used. [00...

Claims

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Application Information

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Patent Type & Authority Patents(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