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A method for increasing the vacuum surface flashover voltage of insulating materials

A technology of surface flashover and insulating materials, which is applied to insulators, circuits, electrical components, etc., can solve the problems of insulator sputtering metal film technology that is difficult to achieve, limitations, and the performance of insulating materials processing materials, and achieves easy processing and homogenization. Electric field strength, reducing the effect of the charging process

Active Publication Date: 2015-08-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for increasing the vacuum surface flashover voltage of insulating materials, the purpose of which is to solve the problem of selection of metal electrode materials with higher work function existing in the existing methods. In the case of small creeping distance, the method of sputtering metal film on insulators is not easy to realize in technology, and the selection of insulating materials is limited by processing and material properties.

Method used

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  • A method for increasing the vacuum surface flashover voltage of insulating materials
  • A method for increasing the vacuum surface flashover voltage of insulating materials
  • A method for increasing the vacuum surface flashover voltage of insulating materials

Examples

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example 1

[0046] First, use absolute ethanol to clean the surface of nylon 66 (the surface length of the material is 1 mm), and air-dry it naturally. Put the air-dried nylon 66 into an ultrasonic cleaning machine, and use deionized water to clean it for 10 minutes; then , put the cleaned nylon 66 into an oven, heat and dry it at a temperature of 60 degrees, and cool it naturally; then, at room temperature, take 20 milliliters with a resistivity of 10 8 Ω~10 9 The liquid of Ω is used as a high resistivity material, and it is stirred evenly for later use. Finally, the high resistivity material is evenly coated on nylon 66, and the nylon 66 is left to air dry naturally at room temperature.

[0047] During the test, two nylon 66 samples with and without high resistivity materials were placed in a vacuum environment (10 -2 -10 -4 Pa), carry out the flashover voltage test along the surface. When carrying out the flashover voltage test along the surface, place the two electrodes on the surf...

example 2

[0051] First, use absolute ethanol to clean the surface of nylon 66 (the surface length of the material is greater than 1 mm), and dry it naturally. Put the air-dried nylon 66 into an ultrasonic cleaner and clean it with deionized water for 10 minutes; then , put the cleaned nylon 66 into an oven, heat and dry it at a temperature of 60 degrees, and cool it naturally; then, at room temperature, take 20 milliliters with a resistivity of 10 -2 Ω~10 -3 The Ω liquid is used as a low-resistivity material, and it is stirred evenly for later use. Finally, the low-resistivity material is coated on nylon 66 by screen printing, and the nylon 66 is left to air dry naturally at room temperature.

[0052] During the test, two samples with and without low resistivity materials were placed in a vacuum environment (10 -2 -10 -4 Pa), carry out the flashover voltage test along the surface. When carrying out the surface flashover voltage test, the two electrodes are placed on the surface of th...

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Abstract

The invention discloses a method for increasing a vacuum surface flash-over voltage of an insulating material. The method includes cleaning the surfaces of the insulating material by absolute ethyl alcohol and naturally air-drying the insulating material; placing the air-dried insulating material into an ultrasonic cleaning machine and cleaning the insulating material by deionized water; placing the cleaned insulating material into an oven, heating and drying the insulating material and naturally cooling the insulating material; judging whether the surface length of the insulating material is smaller than a threshold value or not, uniformly stirring liquid with the specific resistance ranging from 108 omega to 109 omega for standby application as a high-specific-resistance material at a room temperature if the surface length of the insulating material is smaller than the threshold value, uniformly coating the high-specific-resistance material on the insulating material and naturally air-drying the insulating material at the room temperature. The method has the advantage that technical problems of constraints of existing methods on selection of metal electrode materials with high escape power, difficulty in technically implementing methods for sputtering metal films on insulators under the condition of small surface distances and constraints of processing and performance of materials on selection of insulating materials can be solved.

Description

technical field [0001] The invention belongs to the field of high-voltage electric engineering, and more specifically relates to a method for increasing the vacuum surface flashover voltage of insulating materials. Background technique [0002] Because the pulse power system often uses a large number of insulating materials for support and insulation, the surface flashover of insulating materials has become one of the key factors restricting the reliable operation of the power system. Because under the same distance conditions, the insulation surface flashover voltage in the vacuum environment is much lower than the vacuum gap breakdown voltage, such as the critical breakdown field strength of the vacuum is about 350kV / cm, and the surface flashover of the vacuum / alumina system It usually occurs under the applied electric field of tens of kV / cm. The distance along the surface refers to the distance on the insulating material used to fix and insulate between the two electrode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B17/42H01B17/50H01B19/00
Inventor 李化刘德林福昌戴玲李智威王博闻
Owner HUAZHONG UNIV OF SCI & TECH
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