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Cable semi-conductive shielding material and preparation method thereof

A shielding material and semi-conductive technology, applied in the direction of power cables with shielding/conducting layers, etc., can solve the problems of poor economy and difficult realization of cable manufacturing process, reduce the increase of electrical conductivity, reduce the amount of charge, and inhibit accumulation. Effect

Inactive Publication Date: 2009-11-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the space charge in the insulating material can be well reduced by gold-plating the semi-conductive material, it is less economical and difficult to realize in terms of cable manufacturing process

Method used

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  • Cable semi-conductive shielding material and preparation method thereof
  • Cable semi-conductive shielding material and preparation method thereof
  • Cable semi-conductive shielding material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 50 grams of doped carbon black concentration is 30%wt low density polyethylene and 0.5 gram of antioxidant 1010 are put into Huck torque rheometer and mixed, and the mixing temperature is 378K, and the mixing time is 10 minutes, Then 1.15 g of dicumyl peroxide was put into a Haake torque rheometer and kneaded for 10 minutes, and the kneading temperature was kept at 378K. After post-crosslinking treatment, a semi-conductive shielding material that can be used for high-voltage DC plastic cables is obtained.

Embodiment 2

[0030] Put 35 grams of ethylene-vinyl acetate copolymers, 2 grams of antioxidant 1010, and 15 grams of conductive carbon black into the Hack Torque Rheometer for mixing. The mixing temperature is 378K, and the mixing time is 10 minutes. 1.15 g of dicumyl peroxide was put into a Haake torque rheometer and kneaded for 10 minutes, and the kneading temperature was kept at 378K. After post-crosslinking treatment, a semi-conductive shielding material that can be used for high-voltage DC plastic cables is obtained.

Embodiment 3

[0032] Put 35 grams of linear low-density polyethylene, 0.5 grams of antioxidant 1010, and 15 grams of superconducting carbon black into a Hack torque rheometer for mixing. The mixing temperature is 378K, and the mixing time is 15 minutes. 1.15 g of dicumyl peroxide was put into a Haake torque rheometer and kneaded for 15 minutes, and the kneading temperature was kept at 378K. After post-crosslinking treatment, a semi-conductive shielding material that can be used for high-voltage DC plastic cables is obtained.

[0033] Using the materials prepared in the above Examples 1-3 as the semi-conductive shielding material, measure the space charge and electric field distribution of the insulating material XLPE when it is pressed for 60 minutes under an applied electric field of -60kV / mm, as shown in Fig. 1, Fig. 2 and Fig. 3 shows:

[0034]Under the external electric field of -60kV / mm, using the material prepared in Example 1, there is a large amount of injection of charges of the s...

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Abstract

The invention provides a cable semi-conductive shielding material which belongs to the field of electric cable fabrication technique and a preparation method thereof, and the components of the material and the content thereof are as follows: ethylene-vinyl acetate copolymer or linear low density polyethylene 100 proportion by weight, black carbon 10-50 proportion by weight, anti-oxidant 0.1-5 proportion by weight as well as cross linker 0.1-5 proportion by weight. The method provided by the invention can effectively inhibit accumulation of space charges in insulation material, and improves electric field threshold value of injected space charge, which reduces insulation material electric conductivity increased effect induced by space charge-limited current (SCLC), and the electric field distortion rate in XLPE is only 14-19% under -60kV / mm extra electric field for 60 minutes.

Description

technical field [0001] The invention relates to a shielding material in the field of cable technology and a preparation method thereof, in particular to a cable semi-conductive shielding material and a preparation method thereof. Background technique [0002] High-voltage direct current transmission technology is more and more used in power transmission and distribution systems due to its characteristics of high withstand voltage, large transmission capacity, high transmission density, low loss, long life, and transmission distance not limited by capacitive current. . The use of plastic as the insulating material of the cable can make the cable have good mechanical properties, convenient operation and maintenance, acid, alkali, and corrosion resistance. Therefore, DC plastic cables will gradually replace the DC oil-paper insulated cables that are currently used more. Under high DC electric field, the space charge effect in the plastic material and the change of its conducti...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L23/06C08K3/04H01B9/02B29B7/28
Inventor 尹毅王俏华王雅群蔡川吴建东
Owner SHANGHAI JIAO TONG UNIV
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