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Method for improving flashover voltage of ceramic insulator

A ceramic insulator and flashover voltage technology, which is applied in the direction of insulators, circuits, electrical components, etc., can solve the problems that the coating cannot be used in complex structures, the reliability is not high, and the improvement of vacuum insulation flashover characteristics is not large. Improve vacuum surface flashover characteristics, less influencing factors, and improve the effect of surface breakdown voltage

Inactive Publication Date: 2019-08-16
NORTHWEST INST OF NUCLEAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of improving the flashover voltage of insulators in the prior art. Although many improvements have been made in changing the chemical composition of the insulator surface, there are still problems in improving the flashover characteristics of vacuum insulation. layer cannot be used for complex structures, and provides a method to increase the flashover voltage of ceramic insulators

Method used

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  • Method for improving flashover voltage of ceramic insulator
  • Method for improving flashover voltage of ceramic insulator
  • Method for improving flashover voltage of ceramic insulator

Examples

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Effect test

Embodiment 1

[0038] (1) Measure octadecyltrichlorosilane, deionized water and toluene according to the volume ratio of 1:1:30, and dissolve octadecyltrichlorosilane and deionized water in toluene to prepare octadecyltrichlorosilane The toluene solution of silane was stirred and hydrolyzed for 1 h at room temperature to obtain a self-assembly reaction solution;

[0039](2) Immerse a cylindrical aluminum oxide ceramic insulator with a diameter of 30 mm and a thickness of 10 mm in the above-mentioned self-assembly reaction solution and let it stand for 24 hours of molecular self-assembly reaction;

[0040] (3) Take out the insulator, use toluene, ethanol and water to clean it ultrasonically successively, remove the residue on the surface, and dry it under vacuum in an oven at 60°C for 6 hours;

[0041] (4) Raise the temperature of the oven to 120°C, keep it for 2 hours for high-temperature etherification, take it out after cooling, and finally obtain a ceramic insulator sample with a self-ass...

Embodiment 2

[0045] (1) Mix the silane coupling agent KH-570, deionized water and absolute ethanol at a volume ratio of 1:1:450, and perform stirring and hydrolysis at 40°C for 2 hours to obtain a self-assembly reaction solution;

[0046] (2) Immerse a cylindrical zirconia ceramic insulator with a diameter of 30mm and a thickness of 10mm in the self-assembly reaction solution, and carry out a molecular self-assembly reaction at 60°C for 6h;

[0047] (3) Ultrasonic cleaning with ethanol and deionized water successively to remove residues on the surface, and then vacuum drying in an oven at 60°C for 6 hours;

[0048] (4) Raise the temperature of the oven to 110°C for 2 hours for high-temperature etherification, then take it out after cooling, and finally obtain a ceramic insulator sample with a self-assembled film on the surface, which is designated as insulator sample 2.

Embodiment 3

[0050] (1) Measure the silane coupling agent KH-550, deionized water and acetone according to the volume ratio of 1:1:20, and dissolve the silane coupling agent KH-550 and deionized water in acetone to prepare the silane coupling agent KH- 550 of acetone solution, stirred and hydrolyzed for 10 h at room temperature to obtain a self-assembly reaction solution;

[0051] (2) Immerse a cylindrical silicate ceramic insulator with a diameter of 30 mm and a thickness of 10 mm in the above self-assembly reaction solution and let it stand for 12 hours of molecular self-assembly reaction;

[0052] (3) Take out the insulator, ultrasonically clean it with toluene, ethanol and water to remove the residue on the surface, and dry it in a vacuum oven at 60°C for 6 hours;

[0053] (4) Raise the temperature of the oven to 100° C., keep it for 2 hours for high-temperature etherification, take it out after cooling, and finally obtain a ceramic insulator sample with a self-assembled film on the su...

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Abstract

The invention belongs to a method for improving the insulation performance of a ceramic insulator and particularly relates to a method for improving the vacuum flashover voltage of a ceramic insulator. The invention aims to solve the problem that the vacuum insulation flashover voltage withstanding performance in the existing technology of improving insulator flashover voltage has low improvementand poor reliability or a coating cannot be used for a complicated structure. The scheme for improving the flashover voltage of the ceramic insulator comprises the steps of (1) preparing a mixed solution of a silane coupling agent, an organic solvent and deionized water for hydrolysis to obtain a self-assembly reaction liquid, (2) immersing an insulator with a dry surface in the self-assembly reaction liquid for molecular self-assembly reaction, (3) taking the insulator out, cleaning the surface of the insulator and drying to obtain a pre-formed sample, and (4) performing high-temperature etherification reaction on the pre-formed sample to obtain an insulator sample. The method for improving the vacuum surface flashover performance of the ceramic insulator has the advantages of wide application range, high reliability, low process difficulty and low cost.

Description

technical field [0001] The invention belongs to a method for improving the insulation performance of ceramic insulators, and in particular relates to a method for improving the flashover voltage of ceramic insulators. Background technique [0002] In a vacuum insulation system, discharge is very easy to occur along the surface of the insulator, and the discharge voltage is generally much lower than the bulk breakdown voltage of the insulator and the vacuum. This phenomenon is called the vacuum surface flashover of the insulator. The existence of the flashover phenomenon seriously reduces the withstand voltage strength of the entire insulation system and poses a huge hidden danger to the safety and stability of equipment operation. Therefore, how to increase the flashover voltage of insulators has always been a research hotspot in the field of vacuum insulation. In order to increase the flashover voltage of insulators, researchers have invested a lot of research in both theor...

Claims

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Application Information

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IPC IPC(8): H01B19/04H01B19/02H01B19/00
CPCH01B19/00H01B19/02H01B19/04
Inventor 霍艳坤柯昌凤刘文元陈昌华孙钧郭跃文唐运生
Owner NORTHWEST INST OF NUCLEAR TECH
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