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Preparation method for recyclable high-voltage direct-current cable material with function of inhibiting space charge

A high-voltage DC, space charge technology, applied in organic insulators, plastic/resin/wax insulators, etc., can solve problems such as calculation and design difficulties, dielectric breakdown, etc., to achieve favorable space charge dissipation, good mechanical integrity, Effect of spherulite size reduction

Inactive Publication Date: 2015-09-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) Due to the accumulation of space charges, the highest field strength in the dielectric body reaches 8 times the applied electric field, resulting in dielectric breakdown
[0006] 2) The significant electric field distortion effect of space charge makes it difficult to calculate and design the actual electric field in the cable insulation
So far, there is no DC cable covering with excellent thermomechanical properties and space charge suppression

Method used

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  • Preparation method for recyclable high-voltage direct-current cable material with function of inhibiting space charge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 30 grams of isotactic polypropylene, 20 grams of polyolefin elastomer Dow Engage POE 8842, 0.25 grams of antioxidant 1010, 1 gram of flame retardant magnesium hydroxide and 0.25 grams of processing aid glyceryl stearate, at 180 Mixing at ℃ for 6 minutes, with a rotation speed of 60r / min, a recyclable insulating material for high-voltage DC cables is obtained, and its space charge performance is shown in figure 1 (b).

[0029] The recyclable high-voltage DC cable material obtained in the above implementation examples of the present invention still has a suitable storage modulus at 90° C., indicating that its mechanical properties have been greatly improved. At the same time from figure 1 (b) It can be seen that the material has good space charge suppression ability. From the perspective of comprehensive performance, the material meets the requirements of recyclable wire and cable insulation, does not require cross-linking in the preparation process, and is a recyclable...

Embodiment 2

[0031] 35 grams of isotactic polypropylene, 15 grams of polyolefin elastomer Dow Engage POE 8842, 0.3 grams of antioxidant 2246, 1.5 grams of flame retardant low-water zinc borate and 0.3 grams of processing aid glyceryl stearate, in Kneading at 180°C for 6 minutes at a rotational speed of 40r / min to obtain a recyclable insulating material for high voltage direct current cables.

Embodiment 3

[0033] 30 grams of isotactic polypropylene, 20 grams of Dow Engage POE 8150 polyolefin elastomer and 0.4 grams of antioxidant 2246, 2 grams of flame retardant aluminum hydroxide and 0.4 grams of processing aid glyceryl stearate, at 180 Kneading for 8 minutes at a temperature of 50 r / min to obtain a recyclable insulating material for high-voltage direct current cables.

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Abstract

The invention relates to a preparation method for a recyclable high-voltage direct current cable material with the function of inhibiting space charge, and belongs to the technical field of transmission equipment. The preparation method comprises the following steps: mixing isotatic polypropylene, an elastomer, an antioxidant, a fire retardant and a processing aid for 6-10 minutes under the conditions that the temperature is 190-200 DEG C, and the revolving speed is 40-60 r / min to prepare the high-voltage direct current cable material, wherein the ratio of isotatic polypropylene to the elastomer is 1:(0-0.7), and isotatic polypropylene and the elastomer are 100 parts by weight, the antioxidant is 0.5-1 part by weight, the fire retardant is 2-5 parts by weight, and the processing aid is 0.5-1 part by weight. The recyclable high-voltage direct-current cable material takes a mixture of a thermoplastic polymer material and the elastomer as the raw material, the melting point of the polymer material is higher than or equal to 150 DEG C, and the content of octylene in the elastomer is smaller than 14%. The recyclable high-voltage direct-current cable material has the advantages that under the condition that the thermomechanical properties of thermoplastic resin are improved, the space charge of the recyclable high-voltage direct-current cable material can be inhibited well, the recyclable high-voltage direct-current cable material can be recycled after the design lifetime is reached, and environment is not damaged.

Description

technical field [0001] The invention relates to a preparation method of a recyclable high-voltage direct current cable material capable of suppressing space charge, and belongs to the technical field of power transmission equipment. Background technique [0002] DC transmission technology has many advantages over AC transmission technology. First of all, DC transmission does not need to consider the capacitive effect, and there is no distance limit. Secondly, as the distance increases, DC transmission has good economic benefits. Finally, there is no loss of synchronization of the system with DC transmission. With the rapid development of high-voltage DC transmission, especially the construction of underwater DC transmission projects such as cross-straits, and the urgent need to solve the problems of line corridors and urban beauty in power supply in large cities, DC cables have been widely used. [0003] In order to increase the operating temperature of the cable, cross-l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/08C08K3/22C08K3/38H01B3/44
CPCC08L23/12C08L2201/08C08L2203/202H01B3/441C08L23/0815C08K2003/2224C08K2003/387C08K3/2279
Inventor 何金良胡军党斌周垚郭宝华曾嵘余占清
Owner TSINGHUA UNIV
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