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Method for improving insulation space charge characteristics of polypropylene high-voltage direct-current cable

A cable insulation and high-voltage DC technology is applied in the field of improving the insulation space charge characteristics of polypropylene high-voltage DC cables. Improve dielectric strength and electrical aging resistance, improve space charge accumulation, and suppress space charge effects

Inactive Publication Date: 2020-03-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to poor compatibility between nanoparticles and polymers and difficulty in surface modification, a slightly higher additive content may lead to particle agglomeration and defects in the polypropylene matrix, which severely restricts its engineering application.

Method used

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  • Method for improving insulation space charge characteristics of polypropylene high-voltage direct-current cable
  • Method for improving insulation space charge characteristics of polypropylene high-voltage direct-current cable
  • Method for improving insulation space charge characteristics of polypropylene high-voltage direct-current cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The technical solution adopted in this example is to melt and blend the polypropylene composite base material and the free radical scavenger in the following mass ratio, extrude and granulate to make a polypropylene-based high-voltage DC cable that uses free radicals to improve space charge characteristics Insulation material:

[0032] Polypropylene 85 parts

[0033] Ultra-low density polyethylene 15 parts

[0034] Free radical scavenger 622 0.3 parts

[0035] In this example, a free radical scavenger to improve the space charge characteristics of polypropylene high-voltage DC cable insulation material preparation steps is as follows:

[0036] 1. Fully mix polypropylene, ultra-low density polyethylene, and free radical scavenger according to the following parts by mass to obtain a mixture:

[0037] Polypropylene 85 parts

[0038] Ultra-low density polyethylene 15 parts

[0039] Free radical scavenger 622 0.3 parts;

[0040] 2. Put the mixture obtained in step 1 in...

Embodiment 2

[0042] The technical solution adopted in this example is to melt and blend the polypropylene composite base material and the free radical scavenger in the following mass ratio, extrude and granulate to make a polypropylene-based high-voltage DC cable that uses free radicals to improve space charge characteristics Insulation material:

[0043] Polypropylene 85 parts

[0044] Ultra-low density polyethylene 15 parts

[0045] Free Radical Scavenger 770 0.3 parts

[0046] In this example, a free radical scavenger to improve the space charge characteristics of polypropylene high-voltage DC cable insulation material preparation steps is as follows:

[0047] 1. Fully mix polypropylene, ultra-low density polyethylene, and free radical scavenger according to the following parts by mass to obtain a mixture:

[0048] Polypropylene 85 parts

[0049] Ultra-low density polyethylene 15 parts

[0050] Free radical scavenger 770 0.3 parts;

[0051] 2. Put the mixture obtained in step 1 in...

Embodiment 3

[0053] The technical solution adopted in this example is to melt and blend the polypropylene composite base material and the free radical scavenger in the following mass ratio, extrude and granulate to make a polypropylene-based high-voltage DC cable that uses free radicals to improve space charge characteristics Insulation material:

[0054] Polypropylene 85 parts

[0055] Ultra-low density polyethylene 15 parts

[0056] Free radical scavenger 944 0.3 parts

[0057] In this example, a free radical scavenger to improve the space charge characteristics of polypropylene high-voltage DC cable insulation material preparation steps is as follows:

[0058] 1. Fully mix polypropylene, ultra-low density polyethylene, and free radical scavenger according to the following parts by mass to obtain a mixture:

[0059] Polypropylene 85 parts

[0060] Ultra-low density polyethylene 15 parts

[0061] Free radical scavenger 944 0.3 parts;

[0062] 2. Put the mixture obtained in step 1 in...

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PUM

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Abstract

The invention belongs to the technical field of high-voltage direct-current power transmission equipment and discloses a method for improving the insulation space charge characteristics of a polypropylene high-voltage direct-current cable. The method comprises the step of carrying out melt blending and extrusion granulation on a polypropylene composite base material, ultra-low density polyethyleneand a free radical scavenger in a certain mass ratio to prepare a polypropylene-based high-voltage direct-current cable insulation material for improving the space charge characteristics by capturingfree radicals. According the invention, traps with different energy level depths and densities are introduced into the insulation material by utilizing the steric hindrance effect of the free radicalscavenger, so space charges injected by an external electric field are inhibited, and space charge accumulation is improved; and therefore, the insulating strength and the electrical aging resistanceof the polypropylene composite material are improved.

Description

technical field [0001] The invention belongs to the technical field of high-voltage direct-current transmission equipment, and specifically relates to a method for improving the insulation space charge characteristics of polypropylene high-voltage direct-current cables. Background technique [0002] Due to its technical and commercial advantages, extruded insulated cables play an important role in the fields of high-voltage direct current transmission, urban power supply and marine resource development. However, widely used XLPE cables will introduce by-products during the cross-linking process, leading to space charge accumulation and accelerated insulation aging. In addition, the operating temperature limit of XLPE cables cannot meet the higher performance requirements of future power transmission for long-distance and large-capacity power transmission. In recent years, polypropylene has attracted extensive attention in the research field of HVDC cable insulation due to i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/06C08L67/02C08K5/3435C08J3/22
CPCC08J3/226C08J2423/12
Inventor 杜伯学侯兆豪许然然李忠磊李进韩晨磊
Owner TIANJIN UNIV
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