CN108470612B - Epoxy resin insulation surface charge inhibition method based on U-shaped gradient surface treatment - Google Patents
Epoxy resin insulation surface charge inhibition method based on U-shaped gradient surface treatment Download PDFInfo
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- CN108470612B CN108470612B CN201810167215.0A CN201810167215A CN108470612B CN 108470612 B CN108470612 B CN 108470612B CN 201810167215 A CN201810167215 A CN 201810167215A CN 108470612 B CN108470612 B CN 108470612B
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- shaped gradient
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
- H01B19/04—Treating the surfaces, e.g. applying coatings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/50—Insulators or insulating bodies characterised by their form with surfaces specially treated for preserving insulating properties, e.g. for protection against moisture, dirt, or the like
Abstract
The invention discloses an epoxy resin insulation surface charge inhibition method based on U-shaped gradient surface treatment, which is characterized by mainly comprising the following steps: firstly, manufacturing an epoxy resin insulation sample; then, carrying out U-shaped gradient design on the surface of the epoxy resin insulation sample: dividing the surface of a sample into five tightly connected areas, and designing the surface conductance to be reduced and then increased; and placing the sample in fluorination treatment equipment, and treating the sample at different positions for different time at 25 ℃ according to a monotone distribution gradient to obtain the epoxy resin material for inhibiting the accumulation of surface charges. The method has important theoretical value and engineering significance for improving the performance of the GIL insulator and the safety of a direct-current transmission system.
Description
Technical Field
The invention belongs to the field of modified insulating materials and preparation thereof, and particularly relates to an epoxy resin insulating surface charge inhibition method based on U-shaped gradient surface treatment.
Background
With the rapid development of high-voltage transmission systems, GIL (gas insulated metal enclosed pipe) has been widely used in recent years because of its advantages of high reliability, good economy, high voltage withstand level, large transmission capacity, and the like. The basin insulator is used as solid insulation in GIL equipment, the surface of the basin insulator is the weakest part of system insulation, and a large amount of charges are accumulated on the surface of the epoxy insulator during long-term operation, so that surface flashover can be caused. Epoxy resin has excellent electrical, thermal and mechanical properties and is often used to manufacture basin insulators. Studies have shown that epoxy insulation surface flashover induced failures represent a significant proportion of the total failure. Therefore, the insulating material is subjected to surface modification, so that the dissipation of surface charges can be accelerated, a new thought is provided for further improving the reliability of the GIL insulator, and the method becomes an important way for improving the safety and the reliability of a power system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an epoxy resin insulation surface charge inhibition method based on U-shaped gradient surface treatment.
The technical scheme adopted by the invention for solving the technical problems is as follows: an epoxy resin insulation surface charge inhibition method based on U-shaped gradient surface treatment comprises the following steps:
1) preparing an epoxy resin insulation sample:
(1) mixing an epoxy resin base and a curing agent according to a mass ratio of 3: 1;
(2) mechanically stirring for 60-90 min;
(3) degassing for 40-60 min;
(4) pouring into a mold coated with a release agent, heating to 70 ℃, and curing for 4 hours;
(5) heating to 130 ℃, and curing for 4 hours;
(6) after complete solidification, cooling and demolding to obtain an epoxy resin insulation sample;
2) performing U-shaped gradient design on the surface of an epoxy resin insulation sample:
(1) dividing the surface of a sample into five tightly connected areas, and designing the surface conductance to be reduced and then increased;
(2) and placing the sample in fluorination treatment equipment, and treating the sample at different positions for different time at 25 ℃ according to a monotone distribution gradient to obtain the epoxy resin material for inhibiting the accumulation of surface charges.
And in the step 2), the step (2) is carried out for different time at different positions according to the monotone distribution gradient, wherein the fluorination treatment time is respectively 60min, 30min, 0min, 30min and 60 min.
And in the step 2), the step (2) is carried out for different time at different positions according to the monotone distribution gradient, wherein the fluorination treatment time is 45min, 15min, 0min, 15min and 45min respectively.
And in the step 2), the step (2) is carried out for different time at different positions according to the monotone distribution gradient, wherein the fluorination treatment time is respectively 20min, 5min, 0min, 15min and 20 min.
And in the step 1), the epoxy resin in the step (1) is bisphenol A epoxy resin with glycidyl ether.
The curing agent in the step (1) in the step 1) is low molecular weight polyamide resin HY-651.
The gas used by the fluorination treatment equipment in the step (2) in the step 2) is N2/F 24/1 in a volume ratio.
Advantageous effects
According to the invention, the epoxy resin is subjected to gradient fluorination treatment to obtain the epoxy resin material with surface conductance in gradient distribution, so that the accumulation of surface charges is effectively inhibited, the direct-current flashover voltage of the insulator is increased, and the electrical resistance of the insulator is improved.
The method carries out gradient fluorination surface treatment on the epoxy resin sample, and adjusts the fluorination condition to form a surface gradient fluorinated layer, thereby reducing the accumulation of surface charges. Research shows that after the fluorine gas is treated in a gradient manner, the surface conductivity of the sample is distributed in a gradient manner, the numerical value is increased, and the dissipation of the surface charge is accelerated.
Therefore, the research on the surface fluorination gradient modification technology has important theoretical value and engineering significance for improving the operation stability of the GIL and the safety of a power system.
Drawings
FIG. 1 is a flow chart of the epoxy resin insulation sample preparation;
FIG. 2 is a graph of the surface conductance profile of the epoxy resin sample of example 1;
FIG. 3 is a graph comparing the initial surface potential distributions of the epoxy resin test sample of example 1 and an untreated epoxy resin test sample;
FIG. 4 is a schematic diagram of the location of the surface sampling points of the epoxy resin sample.
Detailed Description
The invention is further illustrated by the following specific examples and the accompanying drawings. The examples are intended to better enable those skilled in the art to better understand the present invention and are not intended to limit the present invention in any way.
The invention discloses an epoxy resin insulation surface charge inhibition method based on U-shaped gradient surface treatment, and is characterized in that fig. 1 is a manufacturing flow chart of an epoxy resin insulation sample, and fig. 4 is a schematic diagram of a point-taking position on the surface of the epoxy resin sample.
The epoxy resin used in the invention is bisphenol A epoxy resin of glycidyl ether; the curing agent is low molecular weight polyamide resin HY-651; the gas used for fluorination is the volume ratio N2/F 24/1, and is provided by Tianjin, encyclopedia gas Co.
Example 1
1) Mixing the epoxy resin base and the curing agent according to the mass ratio of 3:1, and stirring for 60min by using a mechanical stirrer; then, degassing the epoxy resin mixture for 40min by using an air pump and a vacuum box; pouring the mixture into a mold coated with a release agent, solidifying, cooling and demolding to obtain the material:
wherein, the epoxy resin is treated by adopting a gradient temperature curing method: the curing process is divided into two steps, the mold and the base material are heated to 70 ℃ for curing for 4 hours, then heated to 130 ℃ for curing for 4 hours, and after complete curing, the epoxy resin insulating sample can be obtained by cooling and demolding;
2) the surface of the epoxy resin sample is subjected to U-shaped gradient design, the surface of the sample is divided into five tightly connected areas, and the designed surface conductance is reduced and then increased. And placing the sample in fluorination treatment equipment, and treating the sample at different positions for different times according to a monotone distribution gradient, wherein the fluorination treatment time is respectively 60min, 30min, 0min, 30min and 60min, and the temperature is 25 ℃, so that the epoxy resin material for inhibiting the accumulation of surface charges can be obtained.
FIG. 2 is a graph of the surface conductance profile of the epoxy resin sample of example 1;
FIG. 3 is a graph comparing the initial surface potential distributions of the epoxy resin samples of example 1 and the untreated epoxy resin samples.
The results show that the surface conductivity of the sample is distributed in a gradient manner and the value is increased after the fluorine gas gradient treatment, and the surface charge dissipation is accelerated.
Example 2
1) The epoxy resin base and the curing agent were mixed in a mass ratio of 3:1 and stirred for 70min using a mechanical stirrer. Then, degassing the epoxy resin mixture for 50min by using an air pump and a vacuum box, pouring the mixture into a mold coated with a release agent, curing, cooling and demolding to obtain the epoxy resin composite material:
wherein the epoxy resin is treated by a gradient temperature curing method. The curing process is divided into two steps, the mold and the base material are heated to 70 ℃ for curing for 4 hours, then heated to 130 ℃ for curing for 4 hours, and after complete curing, the epoxy resin insulating sample can be obtained by cooling and demolding.
2) The surface of the epoxy resin sample is subjected to U-shaped gradient design, the surface of the sample is divided into five tightly connected areas, and the designed surface conductance is reduced and then increased. And placing the sample in fluorination treatment equipment, and treating the sample at different positions for different times according to a monotone distribution gradient, wherein the fluorination treatment time is 45min, 15min, 0min, 15min and 45min respectively, and the temperature is 25 ℃, so that the epoxy resin material for inhibiting the accumulation of surface charges can be obtained.
Example 3
1) The epoxy resin base and the curing agent were mixed in a mass ratio of 3:1 and stirred for 90min using a mechanical stirrer. Then, degassing the epoxy resin mixture for 60min by using an air pump and a vacuum box, pouring the mixture into a mold coated with a release agent, curing, cooling and demolding to obtain the epoxy resin composite material:
wherein the epoxy resin is treated by a gradient temperature curing method. The curing process is divided into two steps, the mold and the base material are heated to 70 ℃ for curing for 4 hours, then heated to 130 ℃ for curing for 4 hours, and after complete curing, the epoxy resin insulating sample can be obtained by cooling and demolding.
2) The surface of the epoxy resin sample is subjected to U-shaped gradient design, the surface of the sample is divided into five tightly connected areas, and the designed surface conductance is reduced and then increased. And placing the sample in fluorination treatment equipment, and treating the sample at different positions for different times according to a monotone distribution gradient, wherein the fluorination treatment time is respectively 20min, 5min, 0min, 15min and 20min, and the temperature is 25 ℃, so that the epoxy resin material for inhibiting the accumulation of surface charges can be obtained.
Claims (7)
1. The epoxy resin insulation surface charge inhibition method based on the U-shaped gradient surface treatment is characterized by comprising the following steps:
1) preparing an epoxy resin insulation sample:
(1) mixing an epoxy resin base and a curing agent according to a mass ratio of 3: 1;
(2) mechanically stirring for 60-90 min;
(3) degassing for 40-60 min;
(4) pouring into a mold coated with a release agent, heating to 70 ℃, and curing for 4 hours;
(5) heating to 130 ℃, and curing for 4 hours;
(6) after complete solidification, cooling and demolding to obtain an epoxy resin insulation sample;
2) performing U-shaped gradient design on the surface of an epoxy resin insulation sample:
(1) dividing the surface of a sample into five tightly connected areas, and designing the surface conductance to be reduced and then increased;
(2) and placing the sample in fluorination treatment equipment, and treating the sample at different positions for different time at 25 ℃ according to a monotone distribution gradient to obtain the epoxy resin material for inhibiting the accumulation of surface charges.
2. The method for suppressing the electric charge on the insulating surface of the epoxy resin based on the U-shaped gradient surface treatment of the claim 1, wherein in the step 2), the step (2) is performed at different positions for different time periods according to the monotone distribution gradient, wherein the fluorination treatment time periods are 60min, 30min, 0min, 30min and 60min respectively.
3. The method for suppressing the electric charge on the insulating surface of the epoxy resin based on the U-shaped gradient surface treatment of the claim 1, wherein in the step 2), the step (2) is carried out at different positions for different time periods according to the monotone distribution gradient, wherein the fluorination treatment time periods are 45min, 15min, 0min, 15min and 45min respectively.
4. The method for suppressing the electric charge on the insulating surface of the epoxy resin based on the U-shaped gradient surface treatment of the claim 1, wherein in the step 2), the step (2) is performed at different positions for different time periods according to the monotone distribution gradient, wherein the fluorination treatment time periods are respectively 20min, 5min, 0min, 15min and 20 min.
5. The method for suppressing the insulation surface charge of the epoxy resin based on the U-shaped gradient surface treatment according to claim 1, wherein in the step 1), the epoxy resin in the step (1) is a bisphenol A epoxy resin with glycidyl ether.
6. The method for suppressing the surface charge of the insulation of the epoxy resin based on the U-shaped gradient surface treatment of claim 1, wherein the curing agent in the step (1) in the step 1) is a low molecular weight polyamide resin HY-651.
7. The method for suppressing the surface charge of the insulation epoxy resin based on the U-shaped gradient surface treatment of claim 1, wherein the gas used in the fluorination treatment equipment of the step (2) in the step 2) is N2/F24/1 in a volume ratio.
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| CN105542399A (en) * | 2016-01-18 | 2016-05-04 | 西安交通大学 | Centrifugal manufacturing method for dielectric functional gradient insulator |
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