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Direct current cable insulating material added with rare earth nanoparticles and preparation method for direct current cable insulating material

A nano-rare earth and DC cable technology, applied in the direction of insulators, organic insulators, plastic/resin/wax insulators, etc., can solve problems such as limiting the voltage level and service life of DC cables, accelerating the aging rate of materials, and accelerating the electrical aging of insulating materials. , to achieve the effect of improving space charge accumulation characteristics, inhibiting space charge accumulation, and increasing melting temperature

Inactive Publication Date: 2014-01-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DC cables have the advantages of high working electric field strength, thin insulation thickness, small cable outer diameter, light weight, good flexibility, convenient installation, low dielectric loss and conductor loss, and large carrying capacity. However, the existence of space charges limits the performance of DC cables. Use voltage level and service life
[0003] When XLPE DC cables exist in the presence of DC and temperature gradients, it is easy to cause space charge accumulation, which distorts the local field strength inside the insulating layer, and the mobility of space charges in the polymer insulating medium is very low, so that the distorted electric field exists for a long time, and the local The strengthening of the electric field accelerates the aging rate of the material, and the aging process is bound to be accompanied by a decline in the electrical and mechanical properties of the material, which accelerates the failure of the cable
Especially when the high-voltage DC cable is running at full load, the temperature of the conductor is higher than the temperature of the outer shielding layer, that is, the temperature of the cable insulation presents a temperature gradient distribution from the inside to the outside. This temperature gradient effect aggravates the injection and migration of charges on the electrodes, prompting The amount of space charge accumulated in the medium increases, which further enhances the electric field strength on the surface of the insulating layer, accelerates the electrical aging of the insulating material, and shortens the service life of the insulating material. Studies have shown that the accumulation of space charge in the XLPE DC cable is the cause of the early insulation of the cable. The main cause of failure, and the temperature gradient effect in actual operation will accelerate the accumulation of space charges and cause early insulation failure of cables

Method used

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  • Direct current cable insulating material added with rare earth nanoparticles and preparation method for direct current cable insulating material
  • Direct current cable insulating material added with rare earth nanoparticles and preparation method for direct current cable insulating material
  • Direct current cable insulating material added with rare earth nanoparticles and preparation method for direct current cable insulating material

Examples

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Embodiment 1

[0043] In this example, the DC cable insulation material with nano-rare earth particles added, in parts by mass, includes 96 parts of low-density polyethylene (LDPE), 1 part of modified MgO nanoparticles, and 2 parts of dicumyl peroxide ( DCP) and 1 part of tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester (referred to as 1010); wherein, the modified MgO nanoparticles are made of aminopropylamino Ethyltrimethoxysilane (N-C 6 h 5 -γ-NH 2 -(CH 2 ) 3 -Si-(OCH 3 ) 3 ) obtained by modifying MgO nanoparticles with a particle size range of 0.3nm-10μm, and the mass ratio of MgO nanoparticles to aminopropylaminoethyltrimethoxysilane is 0.3:1.

[0044] In this embodiment, the preparation method of the DC cable insulating material added with nano-rare earth particles includes the following steps:

[0045] 1) Weigh 96 parts of low-density polyethylene (LDPE), 1 part of modified MgO nanoparticles, 2 parts of dicumyl peroxide (DCP) and 1 part of tetraki...

Embodiment 2

[0051] In this embodiment, the DC cable insulation material with nano-rare earth particles added, in parts by mass, includes 93 parts of ethylene / vinyl acetate copolymer, 5 parts of modified TiO 2 Nanoparticles, 1 part of 2,5-dimethyl-2,5-di-tert-butylperoxyhexane (bis-25) and 0.6 parts of 1,1,3-tris(2-methyl-4-hydroxy- 5 tert-butylphenyl) butane (abbreviated as CA); wherein, the modified TiO2 nanoparticles are made of N-phenyl-γ-aminopropyltrimethoxysilane (N-C 6 h 5 -γ-NH 2 -(CH 2 ) 3 -Si-(OCH 3 ) 3 ) for TiO with a particle size range of 0.3nm-10μm 2 obtained by modification of nanoparticles, and TiO 2 The mass ratio of nanoparticles to N-phenyl-γ-aminopropyltrimethoxysilane is 0.4:0.7.

[0052] In this embodiment, the preparation method of the DC cable insulating material added with nano-rare earth particles includes the following steps:

[0053] 1) In parts by mass, weigh 93 parts of ethylene / vinyl acetate copolymer and 5 parts of modified TiO 2 Nanoparticles, 1...

Embodiment 3

[0059] In this embodiment, the DC cable insulating material with nano-rare earth particles added includes 98 parts by mass of ethylene / ethyl acrylate copolymer, 3 parts of modified nano-rare earth particles, and 1.4 parts of overcooked with a mass ratio of 2:5. A mixture of dicumylhydrogenoxide (DBHP) and di-tert-butyl peroxide (DTBP) and 0.2 parts of 2,2-methylenebis(4-methyl-6-tert-butylphenol) (2246 for short) ; Among them, the modified nano-rare earth particles are made of γ-aminopropyltriethoxysilane (γ-NH 2 (CH 2 ) 3 (C 2 h 5 ) 3 SiO 3 ) obtained by modifying nano-rare earth particles with a particle size range of 0.3nm-10μm, and the mass ratio of nano-rare earth particles to γ-aminopropyltriethoxysilane is 0.7:0.5, and the molar ratio of nano-rare earth particles is 2 :1 mixture of CaO nanoparticles and MgO nanoparticles.

[0060] In this embodiment, the preparation method of the DC cable insulating material added with nano-rare earth particles includes the follo...

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Abstract

The invention discloses a direct current cable insulating material added with rare earth nanoparticles and a preparation method for the direct current cable insulating material. The direct current cable insulating material comprises a polyolefin material, modified rare earth nanoparticles, a peroxide cross-linking agent and a phenolic antioxidant, wherein the modified rare earth nanoparticles are obtained by modifying the rare earth nanoparticles by using a silane coupling agent. The direct current cable insulating material added with the rare earth nanoparticles is obtained by mixing the modified rare earth nanoparticles, the polyolefin material and the phenolic antioxidant by adopting a closed mixing mill and performing cross-linking by using the peroxide cross-linking agent. According to the direct current cable insulating material added with the rare earth nanoparticles and the preparation method for the direct current cable insulating material, the modified rare earth nanoparticles are added, so that spatial charge accumulation characteristics of insulation of a nano composite material are improved, spatial charge accumulation is suppressed, and the influence of field intensity enhancement caused by direct current and temperature gradient is weakened.

Description

technical field [0001] The invention relates to a DC cable insulating material and a preparation method thereof, in particular to a DC cable insulating material added with nano rare earth particles and a preparation method thereof. Background technique [0002] With the development of high-voltage direct current transmission, the application of direct current cables is becoming more and more extensive. DC cables have the advantages of high working electric field strength, thin insulation thickness, small cable outer diameter, light weight, good flexibility, convenient installation, low dielectric loss and conductor loss, and large carrying capacity. However, the existence of space charges limits the performance of DC cables. Use voltage level and service life. [0003] When XLPE DC cables exist in the presence of DC and temperature gradients, it is easy to cause space charge accumulation, which distorts the local field strength inside the insulating layer, and the mobility ...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/08C08K9/06C08K3/22C08K5/14C08K5/134C08K5/13C08J3/22H01B3/44
CPCC08L23/06C08L23/0853C08L23/0869C08L2207/066H01B3/441H01B3/447C08K9/06C08K2003/222C08K2003/2241C08K2003/2206C08L23/0815
Inventor 吴锴王亚
Owner XI AN JIAOTONG UNIV
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