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

A flexible DC power transmission and optical fiber composite technology, which is applied in the direction of power cables, power cables with shielding layers/conductive layers, cables, etc., can solve the problems of easy pollution of graphite particles, environmental pollution of production workshops, and difficult cleaning of asphalt. Achieve the effects of overcoming electric field distortion or even breakdown, preventing electrical tree aging, and overcoming electrochemical corrosion problems

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

This causes pollution to the environment of the production workshop. When installing terminals and joints in the future, the asphalt is not easy to clean and pollutes the environment on site.
[0009] In addition, in order to check the integrity of the non-metallic outer sheath of the traditional cable, it is necessary to install electrodes on the surface of the outer sheath. Now the surface is usually coated with graphite as the test electrode, but graphite particles are easy to pollute the environment.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0021] (1) Water-blocking conductor 1, 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 2, thickness 0.18 mm;

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

[0024] (4) The extruded insulating layer 4 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 cross-linking material and space charge inhibitor is made by melt mixing method;

[0025] (5) Semi-condu...

Embodiment 2

[0034] This embodiment is a rated voltage ±200 kV flexible direct current transmission optical fiber compound extruded insulated power cable.

[0035] (1) Water-blocking conductor 1, 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;

[0036] (2) Semi-conductive Tetoron wrapping tape 2, thickness 0.18 mm;

[0037] (3) Semi-conductive inner shield 3 with a thickness of 1.5 mm;

[0038](4) The extruded insulating layer 4 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 (12~ 14) mm; the mixture of ultra-clean PE crosslinking material and space charge inhibitor is made by melt mixing method;

[0039] (5) Semi-conductive ...

Embodiment 3

[0048] This embodiment is a rated voltage ±160 kV flexible direct current transmission optical fiber compound extruded insulated power cable.

[0049] (1) Water-blocking conductor 1, 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;

[0050] (2) Semi-conductive nylon wrapping tape 2, thickness 0.1 mm;

[0051] (3) Semi-conductive inner shield 3, thickness (1.2-1.5) mm;

[0052] (4) The extruded insulating layer 4 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;

[0053] (5) Semi-conductive outer shield 5, thickness 1 mm;

[0054] (6)...

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Abstract

The invention discloses a high voltage and ultrahigh voltage flexible direct current transmission optical fiber composite extrusion insulation power 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, a non-metal extrusion outer sheath and an extrusion conductive layer are sequentially wrapped outside the water-resistant conductor. Optical fibers are placed between the buffer water-resistant layers. The insulation layer is made of ultra-clean materials containing a space charge inhibitor, the largest allowable working temperature is 90 DEG C, and the shortcoming of electric field distortion even breakdown caused by space charge accumulation of a traditional cable insulation material is overcome. A copper sleeve is adopted to avoid use of asphalt in corrosion resistance. The power cable achieves the effects of being clean and environment in production and installation, overcomes the electrochemical corrosion shortcomings and prevents environment pollution caused by the fact that a graphite conductive layer is coated on the surface of a traditional cable outer sheath to serve as an experiment electrode by extruding a conductive layer on the outer sheath to serve as the experiment electrode.

Description

technical field [0001] The invention relates to a direct current cable, in particular to an optical fiber compound extrusion insulated power 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. Most of China's power transmission cables are AC extruded insulated cables, and low-voltage (30 kV and below) flexible DC extruded insulated cables have only been run once in Shanghai, 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 cables have not been used. [0003] In China, the most commonly used material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B9/00H01B9/02
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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