Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of grafted cross-linked polyethylene insulating layer for high voltage direct current cable and preparation method thereof

A polyethylene insulating layer, grafting and cross-linking technology, applied in the direction of conductor/cable insulation, cable/conductor manufacturing, insulator, etc., can solve the distortion of the electric field distribution of the insulating layer, affect the large-scale production of cables, and aging of the cable insulation layer, etc. problems, to achieve the effect of improving electrical resistance, low price of raw materials and equipment, and prolonging service life

Active Publication Date: 2019-08-02
HARBIN UNIV OF SCI & TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development of high-voltage DC cables is greatly restricted by the electrical insulation layer. The main reason is the new problem faced by the traditional cross-linked polyethylene (XLPE) insulation layer under the condition of DC high-voltage electric field: Under the action of XLPE, a large amount of space charge will accumulate in the insulating layer of XLPE, which will distort the electric field distribution in the insulating layer and cause significant aging and deterioration of the cable insulating layer
The main reason is that although nanocomposites have excellent space charge suppression properties, during the cable production process, the polyethylene resin in the molten state, filled with nanoparticles tends to attach to the cable extruder for filtering impurity particles. The metal filter screen will soon block the filter screen, seriously affecting the large-scale production of cables
At present, there is no related work to show that it can overcome this defect, so whether nanocomposite technology can become a solution for DC cable insulation is still a variable

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of grafted cross-linked polyethylene insulating layer for high voltage direct current cable and preparation method thereof
  • A kind of grafted cross-linked polyethylene insulating layer for high voltage direct current cable and preparation method thereof
  • A kind of grafted cross-linked polyethylene insulating layer for high voltage direct current cable and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The grafted cross-linked polyethylene insulating layer used in the high-voltage DC cable in this embodiment is made of the following raw materials in parts by weight through melt blending, extrusion and cross-linking:

[0038]

[0039] The steps of the preparation method of the grafted cross-linked polyethylene insulating layer for high-voltage DC cables described in this embodiment are as follows:

[0040] 1. Mix low-density polyethylene, propylene chloroacetate, dicumyl peroxide and antioxidant 1010 evenly with the following parts by weight:

[0041]

[0042] 2. Put the mixture obtained in step 1 into an internal mixer, and melt blend for 10 minutes at a temperature of 110° C. and a rotation speed of 40 r / min to obtain a polyethylene composition containing graftable polar groups;

[0043] 3. Put the polyethylene composition obtained in step 2 into a three-layer co-extrusion cable extruder, use the polyethylene composition as the insulating layer material, and si...

Embodiment 2

[0046] The grafted cross-linked polyethylene insulating layer used in the high-voltage DC cable in this embodiment is made of the following raw materials in parts by weight through melt blending, extrusion and cross-linking:

[0047]

[0048]

[0049]The steps of the preparation method of the grafted cross-linked polyethylene insulating layer for high-voltage DC cables described in this embodiment are as follows:

[0050] 1. Mix low-density polyethylene, propylene chloroacetate, dicumyl peroxide and antioxidant 1010 evenly with the following parts by weight:

[0051]

[0052] 2. Put the mixture obtained in step 1 into an internal mixer, and melt blend for 10 minutes at a temperature of 110° C. and a rotation speed of 40 r / min to obtain a polyethylene composition containing graftable polar groups;

[0053] 3. Put the polyethylene composition obtained in step 2 into a three-layer co-extrusion cable extruder, use the polyethylene composition as the insulating layer mater...

Embodiment 3

[0056] The grafted cross-linked polyethylene insulating layer used in the high-voltage DC cable in this embodiment is made of the following raw materials in parts by weight through melt blending, extrusion and cross-linking:

[0057]

[0058] The polyethylene mixture described in this embodiment is a polyethylene mixture composed of low-density polyethylene and high-density polyethylene, which contains 80 parts of low-density polyethylene and 20 parts of high-density polyethylene.

[0059] The steps of the preparation method of the grafted cross-linked polyethylene insulating layer for high-voltage DC cables described in this embodiment are as follows:

[0060] 1. Mix the polyethylene mixture, propylene chloroacetate, dicumyl peroxide and antioxidant 1035 uniformly in the following parts by weight:

[0061]

[0062] The polyethylene mixture described in this embodiment is a polyethylene mixture composed of low-density polyethylene and high-density polyethylene, which con...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of insulating layers of transmission equipment and particularly relates to a grafted crosslinked polyethylene insulating layer for a high voltage direct current cable and a preparation method thereof. By taking a thermoplastic polyethylene material as a base body, a polyethylene composition containing graftable polar groups can be prepared by proportioning raw materials provided by the invention. After the composition is melted and extruded in an extruder, the composition is chemically crosslinked through a crosslinking pipeline, and small molecules with polar groups are grafted to the molecular chains thereof while a polyethylene material is crosslinked to obtain the grafted crosslinked polyethylene insulating layer, wherein the spatial charge can be inhibited obviously. The polar group grafted crosslinked polyethylene insulating layer provided by the invention is applied to the high voltage direct current cable, so that the problem of charge accumulation in the transmission material under the action of the direct current electric field can be inhibited. The grafted crosslinked polyethylene insulating layer prepared by the preparation method notonly is excellent in spatial load inhibiting property, but also has relatively high direct current disruptive strength and relatively low conductivity.

Description

technical field [0001] The invention belongs to the field of insulating layers of power transmission equipment, and in particular relates to a grafted cross-linked polyethylene insulating layer for high-voltage direct current cables and a preparation method thereof. Background technique [0002] As a key component of power transmission, cables play an irreplaceable role in the application of electric energy. The "Global Energy Interconnection" advocated by my country first in the world has been upgraded to a national strategy. Some specific links in the Energy Internet architecture, such as long-distance, large-capacity power transmission, cross-sea power transmission, distributed and intermittent new energy power grid connection, etc., all need to rely on high-voltage DC cables to build efficiently. However, the development of high-voltage DC cables is greatly restricted by the electrical insulation layer. The main reason is the new problem faced by the traditional cross-l...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02C08F218/12H01B7/02H01B7/17H01B13/14H01B13/24H01B3/44
CPCC08F255/02H01B3/441H01B7/0225H01B7/0275H01B7/17H01B13/14H01B13/24C08F218/12
Inventor 赵洪赵新东陈俊岐付一峰孙伟峰
Owner HARBIN UNIV OF SCI & TECH