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Method for restraining space charge of high voltage direct current cable by using benzil derivative

A technology of benzil derivatives and high-voltage direct current, applied in circuits, electrical components, plastic/resin/wax insulators, etc., can solve the problem of destroying the insulating properties of cross-linked polyethylene materials

Inactive Publication Date: 2018-08-14
TIANJIN UNIV
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Problems solved by technology

However, how to ensure the uniform dispersion of nanoparticles in cross-linked polyethylene materials has always been a difficult problem that cannot be effectively solved
The agglomeration of nanoparticles in the cross-linked polyethylene material will make the nanoparticles themselves an impurity and seriously damage the insulating properties of the cross-linked polyethylene material

Method used

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  • Method for restraining space charge of high voltage direct current cable by using benzil derivative
  • Method for restraining space charge of high voltage direct current cable by using benzil derivative
  • Method for restraining space charge of high voltage direct current cable by using benzil derivative

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Embodiment Construction

[0024] The present invention will be further described below through specific embodiments and accompanying drawings. The embodiments of the present invention are for better understanding of the present invention by those skilled in the art, and do not limit the present invention in any way.

[0025] The method for benzil derivatives of the present invention to suppress the space charge of a high-voltage DC cable comprises the following steps:

[0026] 1) Put dry low-density polyethylene, antioxidant 1010, dicumyl peroxide and 4,4'-bisdimethylaminobenzil in an internal mixer at a mass ratio of 100:0.1:2:0.5 Fully mix in the medium for 30 minutes, the temperature is 110°C, the speed of the internal mixer is 100r / min, and the internal mixing mixture is obtained after fully mixing;

[0027] 2) Weigh 1.5 g of the banburying mixture and place it in a flat vulcanizer, preheating at 120°C for 10 minutes to fully melt the mixture;

[0028] 3) Pressurize the flat vulcanizer to 30MPa, ...

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Abstract

The invention discloses a method for restraining space charge of a high voltage direct current cable by using a benzil derivative. The method comprises the following main steps: putting low density polyethylene, an antioxidant, a cross-linking agent and 4,4'-bis(dimethylamino)benzil into an internal mixer according to the mass ratio of 100 to 0.1 to 2 to 0.5, and fully mixing the materials at thetemperature of 110 DEG C to obtain a banburying mixture; preheating and fully melting; carrying out sufficient cross-linking; keeping the pressure unchanged to enable a cross-linked polyethylene sample to be naturally cooled to room temperature and taking out the sample for pressing; putting the pressed sample into a vacuum chamber for drying. The method for restraining the space charge of the high voltage direct current cable by using the benzil derivative, disclosed by the invention, has the advantages that injection and accumulation of the space charge in XLPE are significantly restrained and the dissipation of the space charge in the XLPE is accelerated.

Description

technical field [0001] The invention belongs to the technical field of suppressing space charge of high-voltage direct-current cross-linked polyethylene cable insulation, and mainly relates to a method for suppressing space charge of high-voltage direct-current cables by benzil derivatives. Background technique [0002] High-voltage DC cables play an irreplaceable role in today's power systems, and cross-linked polyethylene is currently the main insulating material used in high-voltage DC cables. When the high-voltage DC cable is running, the XLPE insulating material is easy to inject and accumulate space charges under the DC field, which distorts the electric field and affects the insulation properties such as aging, partial discharge, and breakdown. According to the electromagnetic field theory, 1μC / cm in the flat sample 3 The space charge produces an electric field of 50kV / mm at 1mm. Space charge accumulation affects the electric field distribution and causes local elec...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K5/134C08K5/18C08J3/24H01B3/44
CPCC08J3/24C08J2323/06C08K5/1345C08K5/18H01B3/441
Inventor 韩晨磊杜伯学许然然侯兆豪李进
Owner TIANJIN UNIV
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