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Method for improving vacuum surface flashover performance of solid insulation medium

A flashover and vacuum technology along the surface, applied in the direction of insulators, electrical components, circuits, etc., to achieve the effects of reducing electric field distortion, increasing flashover voltage, and suppressing secondary electron emission

Inactive Publication Date: 2016-04-13
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are very few reports on the use of low-energy electron radiation technology to improve the insulation performance of polymers, and the research on the use of low-energy electron radiation technology to improve the vacuum surface flashover performance of polymer insulators has not been involved.

Method used

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  • Method for improving vacuum surface flashover performance of solid insulation medium
  • Method for improving vacuum surface flashover performance of solid insulation medium
  • Method for improving vacuum surface flashover performance of solid insulation medium

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1) Prepare polyimide insulator samples. The samples are prepared from polyimide powder materials by molding method. The sample size is Φ100mm and the thickness is 1mm;

[0035] 2) Clean the sample: first wipe the surface clean with absolute ethanol, then ultrasonically clean it with deionized water for 30 minutes, then place it in a vacuum drying oven (atmospheric pressure less than 10Pa, temperature 393K), heat and dry After 24 hours, take out the sample and place it in a desiccator at room temperature for 12 hours;

[0036] 3) Place the insulator in the vacuum chamber of the low-energy electron radiation system, the surface of the sample is perpendicular to the direction of the electron beam, turn on the vacuum system, and wait until the vacuum degree reaches 5×10 -4 After Pa, turn on the low-energy electron radiation source to modify the surface of the insulator sample by radiation. The electron beam energy is 10keV, and the radiation time is 0.5-1h;

[0037] 4) Tur...

Embodiment 2

[0044] 1) Prepare polytetrachlorethylene insulator samples. The samples are prepared from polytetrachlorethylene powder materials by molding method. The sample size is Φ100mm and the thickness is 1mm;

[0045] 2) Clean the sample: first wipe the surface clean with absolute ethanol, then ultrasonically clean it with deionized water for 30 minutes, then place it in a vacuum drying oven (atmospheric pressure less than 10Pa, temperature 393K), heat and dry After 24 hours, take out the sample and place it in a desiccator at room temperature for 12 hours;

[0046] 3) Place the insulator in the vacuum chamber of the low-energy electron radiation system, the surface of the sample is perpendicular to the direction of the electron beam, turn on the vacuum system, and wait until the vacuum degree reaches 5×10 -4 After Pa, turn on the low-energy electron radiation source to modify the surface of the insulator sample by radiation. The electron beam energy is 10keV, and the radiation time i...

Embodiment 3

[0052] 1) Prepare epoxy resin insulator samples, which are formed by heating and curing epoxy resin. The sample size is Φ100mm and the thickness is 1mm;

[0053] 2) Clean the sample: first wipe the surface clean with absolute ethanol, then ultrasonically clean it with deionized water for 30 minutes, then place it in a vacuum drying oven (atmospheric pressure less than 10Pa, temperature 393K), heat and dry After 24 hours, take out the sample and place it in a desiccator at room temperature for 12 hours;

[0054] 3) Place the insulator in the vacuum chamber of the low-energy electron radiation system, the surface of the sample is perpendicular to the direction of the electron beam, turn on the vacuum system, and wait until the vacuum degree reaches 5×10 -4 After Pa, turn on the low-energy electron radiation source to modify the surface of the insulator sample by radiation. The electron beam energy is 10keV, and the radiation time is 0.5-1h;

[0055] 4) Turn off the low-energy e...

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Abstract

The invention provides a method for improving vacuum surface flashover performance of a solid insulation medium. A low-energy electron beam is used for radiating an insulator, the material of the solid insulator is a polymer, and the energy of the low-energy electron beam is not more than 20KeV. According to the method, an electronic gun is used for emitting the electron beam, the surface of the insulator (usually the depth is less than 10 micrometers) is only modified by the method, the inherent electric breakdown resistant performance of the insulator material is not affected on the condition of remarkably increasing the vacuum surface flashover voltage of the insulator, the inherent profile size and the accuracy of an insulation structural member are not changed, the environment is not polluted, and the method can be used for surface treatment of various polymer insulator materials such as polyimide, polytetrafluoroethylene and epoxy resin. Therefore, the method has the advantages of a wide application scope, high reliability, process simplicity, high maneuverability and the like; and a low-energy electron radiation technique proposed by the invention can be directly used for processing an insulation element, and the treatment process is free from limitation of factors such as external environment temperature and humidity.

Description

technical field [0001] The invention belongs to the field of electrical high-voltage insulating materials, and particularly relates to a method for improving the vacuum surface flashover performance of a solid insulating medium. Background technique [0002] As an excellent insulating medium, vacuum is widely used in electrical equipment and electronic devices due to its good dielectric properties and low cost, such as vacuum diodes, vacuum switches, pulse power switches, high-energy accelerators, etc. When the solid insulator is introduced into the vacuum gap as a support or insulation partition, there is a problem of creeping flashover at the interface between the insulator and the vacuum, which is much lower than the insulator's intrinsic breakdown field strength and the vacuum gap breakdown field strength. The flashover phenomenon in the vacuum seriously restricts the electric strength of the composite insulation system. The flashover discharge pulse will not only interf...

Claims

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Application Information

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IPC IPC(8): H01B19/04
CPCH01B19/04
Inventor 张振军郑健李秀卫袁海燕王斌王辉任敬国李杰师伟云玉新
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY