Polypropylene cable material under polarity inversion working condition, and preparation method and application of polypropylene cable material

A polarity reversal, polypropylene technology, applied in circuits, electrical components, plastic/resin/wax insulators, etc., can solve the problems of reduced breakdown strength of insulating materials, unfavorable long-term stable operation of high-voltage DC cables, etc., to reduce damage , less space charge accumulation, the effect of suppressing partial discharge

Inactive Publication Date: 2020-07-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in conventional HVDC transmission, there is a working condition of voltage polarity reversal, which is unfavorable for the long-term stable operation of HVDC cables.
[0003] After the polarity is reversed, the external electric field and the space charge accumulated inside the material before the polarity reversal will distort the local electric field, which will reduce the breakdown strength of the insulating material after the polarity reversal

Method used

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  • Polypropylene cable material under polarity inversion working condition, and preparation method and application of polypropylene cable material
  • Polypropylene cable material under polarity inversion working condition, and preparation method and application of polypropylene cable material
  • Polypropylene cable material under polarity inversion working condition, and preparation method and application of polypropylene cable material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment relates to a polypropylene thermoplastic cable insulation material that improves the dielectric properties under polarity reversal conditions. The polypropylene composite insulation material includes 99.7% polypropylene matrix and 0.3% sulfur based on 100% mass fraction Substitute bisphenol compound filler. Wherein the preparation method of the polypropylene thermoplastic cable insulating material which improves the dielectric properties under the polarity reversal working condition is as follows:

[0036] A. Mix 29.91g of isotactic polypropylene particles on a two-roller machine for 10 minutes to fully melt them, and set the temperature to 200°C;

[0037] B. Suspend mixing, mix 0.09g 4,4'-thiobis(6-tert-butyl-3-methylphenol) and 4,4'-thiobis-(2-methyl-6-tertbutyl Base phenol) is mixed with isotactic polypropylene respectively, so that the additive is fully melted in the isotactic polypropylene;

[0038] C. Continue to fully knead the mixture on a two-...

Embodiment 2

[0041] This embodiment relates to a polypropylene thermoplastic cable insulation material that improves the dielectric properties under polarity reversal conditions. The polypropylene composite insulation material includes 99.5% polypropylene matrix and 0.5% sulfur based on 100% mass fraction Substitute bisphenol compound filler. Other steps are with embodiment 1.

Embodiment 3

[0043] This embodiment relates to a polypropylene thermoplastic cable insulation material that improves the dielectric properties under polarity reversal conditions. The polypropylene composite insulation material includes 99.6% polypropylene matrix and 0.4% sulfur based on 100% mass fraction Substitute bisphenol compound filler. Other steps are with embodiment 1.

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Abstract

The invention discloses a polypropylene cable material under a polarity inversion working condition, and a preparation method and application of the polypropylene cable material. The polypropylene composite insulating cable material is prepared from the following components in percentage by mass: 99.5 to 99.7 % of a polypropylene matrix and 0.3 to 0.5 % of a thiobisphenol compound filler. On one hand, a hindered phenol unit in the thiobisphenol compound captures free radicals generated in the matrix through proton transfer, so formation of a low-density region in the polypropylene material isinhibited, and then occurrence of partial discharge is inhibited; on the other hand, multi-scale trap distribution is provided for the polypropylene matrix, so damage of collision ionization and high-energy charge movement to molecular chains is reduced, and therefore, breakdown strength is improved. The breakdown strength of the polypropylene thermoplastic cable insulating material prepared by the method is reduced slightly after polarity inversion, and the polypropylene thermoplastic cable insulating material still keeps good insulating property compared with pure isotactic polypropylene andis applicable to high-voltage direct-current cables.

Description

technical field [0001] The invention belongs to the technical field of electrical and electronic material preparation, and in particular relates to a polypropylene cable material under the polarity reversal working condition, a preparation method and an application thereof. Background technique [0002] Polypropylene is an environmentally friendly high-voltage DC cable insulation material. Compared with traditional cross-linked polyethylene insulation materials, it has the advantages of high operating temperature, low electrical conductivity, high breakdown strength, and not easy to accumulate space charges. However, in conventional high-voltage direct current transmission, there is a working condition of voltage polarity reversal, which is unfavorable for the long-term stable operation of high-voltage direct current cables. [0003] After the polarity is reversed, the external electric field and the space charge accumulated in the material before the polarity reversal will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K5/375H01B3/44
CPCC08K5/375C08K2201/014C08L2203/202H01B3/441C08L23/12
Inventor 杜伯学刘畅李忠磊
Owner TIANJIN UNIV
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