Direct-current cable insulation material for suppressing space charge and preparation method of direct-current cable insulation material

A DC cable and space charge technology, which is applied in the field of DC cable insulation material and its preparation to suppress space charge, achieves good processing characteristics, avoids agglomeration, and is conducive to long-term start-up production

Inactive Publication Date: 2019-06-28
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanoparticles are prone to agglomeration, and the addition of agglomerated powder will bring new impurities into the insulating material

Method used

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  • Direct-current cable insulation material for suppressing space charge and preparation method of direct-current cable insulation material
  • Direct-current cable insulation material for suppressing space charge and preparation method of direct-current cable insulation material
  • Direct-current cable insulation material for suppressing space charge and preparation method of direct-current cable insulation material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] According to the weight ratio of 99:1:0.2, the low-density polyethylene, ethylene acrylic acid copolymer and antioxidant were added to the internal mixer, melted and kneaded at 130°C for 15 minutes, and the obtained material was melted in a single-screw extruder. Extrusion, the extrusion temperature is 160°C, the screw speed is 220r / min, the molten material is filtered through a 500-mesh screen and extruded through the die, cooled and granulated; then the post-absorption technology will be used according to a certain ratio of 100:1.6 The peroxide cross-linking agent and the obtained material particles are mixed and absorbed at a temperature of 80° C., kept warm until the cross-linking agent is completely absorbed, and then cooled to room temperature to prepare a pre-cross-linked insulating material.

Embodiment 2

[0031] According to the weight ratio of 98:2:0.15, the low-density polyethylene, ethylene acrylic acid copolymer and antioxidant were added to the internal mixer, melted and kneaded at 125°C for 14 minutes, and the obtained material was melted in a single-screw extruder. Extrusion, the extrusion temperature is 165°C, the screw speed is 200r / min, the molten material is filtered through a 500-mesh screen and then extruded through the die head, cooled and granulated; then the post-absorption technology will be used according to a certain ratio of 100:1.8 The peroxide cross-linking agent and the obtained material particles are mixed and absorbed at a temperature of 70° C., kept warm until the cross-linking agent is completely absorbed, and then cooled to room temperature to prepare a pre-cross-linked insulating material.

Embodiment 3

[0033] According to the weight ratio of 97:3:0.25, the low-density polyethylene, ethylene acrylic acid copolymer and antioxidant were added to the internal mixer, melted and kneaded at 120°C for 15 minutes, and the obtained material was melted in a single-screw extruder. Extrusion, the extrusion temperature is 160°C, the screw speed is 250r / min, the molten material is filtered through a 500-mesh screen, and then extruded from the die, cooled and granulated; then the post-absorption technology will be used according to a certain ratio of 100:1.7 The peroxide cross-linking agent and the obtained material particles are mixed and absorbed at a temperature of 75° C., kept warm until the cross-linking agent is completely absorbed, and then cooled to room temperature to prepare a pre-cross-linked insulating material.

[0034] Figure 1-Figure 3 It is the space charge distribution diagram of the embodiment of the present invention under the 30kV / mm DC field. It can be seen from the fi...

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Abstract

The invention discloses a direct-current cable insulation material for suppressing a space charge. The direct-current cable insulation material contains the following components in by weight: 95-102 parts of low-density polyethylene LDPE, 1-6 parts of an ethylene acrylate polymer, 0.05-0.35 part of an antioxidant and 1.5-3.0 parts of a cross-linking agent. According to the direct-current cable insulation material, the accumulation of the space charge is effectively controlled under a direct current field. The preparation method provided by the invention is good in machinability, the productionefficiency is improved, and the preparation method can be widely applied to the preparation of direct current cable insulation materials.

Description

technical field [0001] The invention relates to a high-voltage DC cable insulating material and a preparation method thereof, in particular to a DC cable insulating material for suppressing space charge and a preparation method thereof. Background technique [0002] At present, high-voltage direct current transmission technology is the best choice to realize large-scale long-distance transmission of electric energy and new energy consumption. The direct current cable system has become the physical basis and key equipment for constructing direct current grid. Compared with the AC transmission system, the HVDC transmission system has the advantages of low line cost and no need for reactive power compensation, and can well solve the problem of interconnection between the new energy power generation system and the AC backbone network. In recent years, XLPE extruded cables are the key development direction of DC cables in the future because of their advantages such as large trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/08C08K5/14
Inventor 李维康张翀闫轰达李文鹏陈新
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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