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High-voltage direct-current cable material and preparation method thereof

A high-voltage DC, cable material technology, applied in circuits, electrical components, plastic/resin/wax insulators, etc., can solve problems such as injection and accumulation, and achieve the effect of suppressing electrical trees, low cost, and suppressing space charge accumulation characteristics

Active Publication Date: 2015-09-16
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-voltage direct current cable material and its preparation method to solve the problem of space charge injection and accumulation of existing plastic high-voltage direct current transmission

Method used

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  • High-voltage direct-current cable material and preparation method thereof
  • High-voltage direct-current cable material and preparation method thereof
  • High-voltage direct-current cable material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Cable material formula

[0031]

[0032] (2) The preparation process is

[0033] 1) Preparation of modified nano-magnesium oxide: mix magnesium oxide with a particle size of 30nm and coupling agent KH550 at a mass ratio of 20:3, mill on a roller mill for 1 hour, and set aside;

[0034] 2) Premixing: mix low-density polyethylene and liquid paraffin evenly in a high-speed mixer, raise the temperature of the material to 60°C, then add the modified nano-magnesia in step 1), keep the temperature of the material until it is evenly mixed, and finally add anti Oxygen 300 and dibenzoyl are mixed evenly again;

[0035] 3) Pelletizing: the mixed material is prepared in an extruder at a temperature of 200° C. at a discharge speed of 300 r / min to prepare a cable material.

Embodiment 2

[0037] (1) The formula of the cable material is as follows:

[0038]

[0039] (2) The preparation process is:

[0040] 1) Preparation of modified nano-magnesia: mix magnesium oxide with a particle size of 50nm and coupling agent KH580 at a mass ratio of 20:3, mill on a roller mill for 1.5h, and set aside;

[0041] 2) Premixing: mix low-density polyethylene and liquid paraffin evenly in a high-speed mixer, add the modified nano-magnesium oxide prepared in step 1) after the temperature of the material rises to 65°C, keep the temperature of the material until it is evenly mixed, and finally add anti Oxygen 300 and 2,2-methyl-benzoyl are mixed evenly again;

[0042] 3) Extrusion granulation: the mixed material is prepared in an extruder at a temperature of 220° C. at a discharge speed of 350 r / min to prepare a cable material.

Embodiment 3

[0044] (1) Cable material formula

[0045]

[0046] (2) Preparation process

[0047] 1) Preparation of modified nano-magnesium oxide: mix magnesium oxide with a particle size of 80nm and coupling agent KH560 at a mass ratio of 20:3, mill on a roller mill for 2 hours, and set aside;

[0048] 2) Premixing: mix low-density polyethylene and liquid paraffin evenly in a high-speed mixer, raise the temperature of the material to 70°C, then add the modified nano-magnesia prepared in step 1), keep the temperature of the material until it is evenly mixed, and finally add anti Oxygen 300 and 2,2-ethyl-benzoyl were mixed evenly again;

[0049] 3) Extrusion granulation: the mixed material is prepared in an extruder at a temperature of 250° C. at a discharge speed of 400 r / min to prepare a cable material.

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Abstract

The invention provides a high-voltage direct-current cable material and a preparation method thereof. The high-voltage direct-current cable material comprises the following components in parts by mass: 90-100 parts of low-density polyethylene, 0.5-3.5 parts of modified nanometer magnesia, 0.1-0.5 part of molten paraffin, 0.001-0.08 part of an antioxidant and 0.001-2.5 parts of a benzyl compound. The preparation method comprises the following steps: preparing the modified nanometer magnesia by using a drum ball-milling method, premixing the raw materials, and finally pelleting, thereby obtaining the high-voltage direct-current cable material. The high-voltage direct-current cable material provided by the scheme of the invention is excellent in space charge accumulation inhibition property under the condition of 40kV / mm and high in breakdown field strength, and the requirement of high-voltage direct-current cable power transmission of 100kV can be met.

Description

technical field [0001] The invention relates to a power cable material and a preparation method thereof, in particular to a high-voltage direct current cable material and a preparation method thereof. Background technique [0002] With the increasing shortage of power resources, the traditional AC transmission method tends to be replaced by the low-loss, low-cost plastic high-voltage DC transmission method due to its shortcomings such as high loss and high cost. The present inventor has conducted a lot of research on the current plastic high-voltage direct-current cables and found that some properties of high-voltage direct-current cable materials of 100 kV and above put into the market need to be improved. [0003] For example, there is a large amount of space charge injection and accumulation in the cable insulation layer during operation. In this case, electrical breakdown will occur to a certain extent, and eventually lead to transmission accidents. Therefore, it is nec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L91/06C08K9/10C08K3/22H01B3/44
CPCC08K2201/011C08L23/06C08L2203/202C08L2207/066H01B3/441C08L91/06C08K9/10C08K2003/222
Inventor 张翀于凡
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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