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Method of increasing vacuum surface flashover voltage of insulating dielectric material and modified insulating dielectric material

An insulating medium, surface flashover technology, applied in insulators, insulators, circuits, etc., can solve problems such as being unsuitable for large-scale industrial production, complex or expensive raw materials or equipment, and complicated processing methods, and achieve fast surface potential decay. , the effect of increased surface conductivity and strong environmental friendliness

Active Publication Date: 2017-02-15
PINGGAO GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials or equipment required by the previous surface modification methods are relatively complicated or expensive, and the operation of the treatment method is very cumbersome but the modification effect is not obvious, so it is not suitable for large-scale industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The preparation method of the epoxy resin material doped with alumina is as follows:

[0027] 1) Dry the micron alumina powder in an oven at 120°C for 12 hours, and set aside;

[0028] 2) Heat the solid epoxy resin in an oven at 65°C for 2 hours to melt it, pour the molten epoxy resin into a three-necked flask for stirring, and the three-necked flask is heated with a constant temperature oil bath at 120°C;

[0029] Add the dried micron alumina particles obtained in step 1) into the above-mentioned three-necked flask, and stir for 30 minutes under vacuum; take the curing agent and add it to the three-necked flask, continue to stir under vacuum for 15 minutes, stop stirring and vacuumize after mixing uniformly, and obtain the mixture ;

[0030] 3) The obtained mixture was poured into a mold preheated at 120°C, and the poured mold was placed in an oven at 120°C to cure for 24 hours and then released from the mold to obtain an alumina-doped epoxy resin material sample.

...

Embodiment 1

[0033] The method for improving the vacuum surface flashover voltage of the insulating dielectric material in this embodiment is as follows: clamp one end of the sample after drying with a metal clip and hang it on the metal support, and the metal support is placed in the ozone treatment sample chamber (airtight chamber) During the process, adjust the metal clamp so that the circular surface of the sample faces the air inlet of the sample chamber; close the air inlet of the sample chamber, open the air valve, and turn on the mechanical pump to vacuum the sample chamber. After 30 minutes, the vacuum degree of the sample chamber When it reaches below 10Pa, close the purge valve and mechanical pump to stop vacuuming. Open the pressure reducing valve of the oxygen cylinder to supply oxygen for the ozone generating system (ozone machine), turn on the ozone generating system, and the generated ozone enters the sample chamber through the air inlet; adjust the oxygen intake of the ozon...

Embodiment 2

[0035] In the method of increasing the vacuum surface flashover voltage of the insulating dielectric material in this embodiment, the ozone treatment time is 4 hours, and the rest is the same as that in Embodiment 1.

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Abstract

The invention discloses a method of increasing a vacuum surface flashover voltage of an insulating dielectric material and a modified insulating dielectric material. The method comprises the steps of modifying the surface of a solid insulating dielectric material by adopting ozone, to be specific, putting the to-be-processed solid insulating dielectric material in a sealed cavity, vacuumizing the sealed cavity and then inletting ozone for ozone treatment to obtain the modified insulating dielectric material. The surface conductivity, the surface trap level and the trap density of the insulating dielectric material after the ozone treatment are changed; the surface conductivity is increased obviously, the surface trap level is reduced and the trap density is increased. The method can obviously increase the vacuum alternating current surface flashover voltage of the solid insulating dielectric material; and the method is simple and convenient to operate, has low complexity of the implementation process, relatively good repeatability and strong environmental friendliness, and can be widely applied to the surface treatment of the solid insulating dielectric material in the technical field of high-voltage insulation.

Description

technical field [0001] The invention belongs to the technical field of insulating materials, and in particular relates to a method for increasing the vacuum surface flashover voltage of insulating dielectric materials, and also relates to a modified insulating dielectric material obtained by the method. Background technique [0002] The insulating dielectric materials that play a supporting role in power equipment need to withstand AC and DC high voltages, and are developing towards high power density and miniaturization, which is the key to the field of high-voltage insulation technology. Vacuum is a special dielectric, which has high dielectric strength and can reduce the weight of equipment. It has been widely used in electric vacuum devices, high-power pulse devices, particle accelerators and high-voltage gas insulation shutdown equipment. [0003] However, in power equipment, surface flashover occurs at the interface between solid insulating dielectric materials and vac...

Claims

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Application Information

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IPC IPC(8): H01B19/04H01B17/56
CPCH01B17/56H01B19/04
Inventor 林生军谭盛武韩国辉谢美芳黄印闵道敏李盛涛袁端鹏田浩罗军
Owner PINGGAO GRP
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