CN112679783A - Method for improving surface flashover performance of epoxy resin material in sulfur hexafluoride atmosphere - Google Patents
Method for improving surface flashover performance of epoxy resin material in sulfur hexafluoride atmosphere Download PDFInfo
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Abstract
The invention discloses a method for improving the surface flashover performance of an epoxy resin material in sulfur hexafluoride atmosphere. Placing the epoxy resin and the alumina micron composite material thereof as objects in a vacuum degree of less than 5 multiplied by 10‑4In an experimental cavity of Pa, the passing energy is 0-20keV, and the beam density is 5 multiplied by 10‑4A/m2The electron beam irradiation material is used for carrying out surface treatment on the epoxy resin and the micron composite material thereof. The surface resistivity and the surface trap distribution of the processed material are changed, so that SF is improved6The direct current surface flashover performance of the material under the atmosphere. The invention can obviously improve the epoxy resin and the composite insulating material SF thereof6The surface flashover voltage under the atmosphere is improved by more than 10 percent, and the treatment method is direct and effective and shortThe method has the advantages of obvious treatment effect and high stability, and can be popularized and applied to the surface treatment of the GIS basin-type insulator to improve the surface flashover performance.
Description
Technical Field
The invention belongs to the technical field of high voltage and insulation, and particularly relates to a method for improving the surface flashover performance of an epoxy resin material in sulfur hexafluoride atmosphere.
Background
The solid insulation surface flashover is always the leading edge basic problem in the technical field of high voltage and insulation, and is one of the technical bottlenecks of advanced power transmission and transformation equipment, pulse power driving sources and spacecraft power systems. The surface flashover voltage of the solid insulation and vacuum or gas interface is several times to dozens of times lower than the breakdown voltage of solid medium or vacuum and gas at the same gap distance, and is one of the weakest links of an electric equipment insulation system. Epoxy resin and SF6Gases have found wide use in electrical equipment because of their good insulating properties. In practice, the insulation fault caused by the surface flashover restricts the normal operation of the equipment, causes the equipment fault, and greatly limits the application and development of the insulation medium in the power equipment. Therefore, the insulating dielectric material SF is researched and improved6The method for the surface flashover performance under the atmosphere has important significance for improving the operation safety of power equipment, promoting the miniaturization of the equipment and ensuring the safe and stable operation of an insulating system.
The current generally accepted development process of the flashover along the surface by the academic community mainly comprises a Secondary Electron Emission (SEEA) model and an Electron Triggered Polarization (ETPR) model. Based on these two models, numerous scholars have proposed methods to increase the flashover voltage along the surface of the insulation material. The method comprises the steps of improving the surface flashover performance of a sample by changing the surface roughness, such as surface coating, polishing and the like; surface treatment is carried out through a chemical mode, such as surface fluorination, oxyfluorination and ozone oxidation, so that the surface conductivity and the shallow trap density of the material are improved, and the surface flashover performance of the material is further improved; changing material body characteristics, such as micron and nano particle doping; however, these methods of treatment have their limitations. For example, the surface treatment of materials by ozone oxidation (fluorination, oxyfluorination), the treatment process can be dangerous to the health of the operators and the gases used are harmful to the environment; the doping of the micro-particles and nano-particles for bulk modification can improve the flashover performance of the material to a certain extent, but can change the bulk properties of the material such as dielectric properties.
Disclosure of Invention
The invention mainly aims to provide a method for improving the surface flashover performance of an epoxy resin material in sulfur hexafluoride atmosphere so as to overcome the existing problems6Surface flashover behavior under atmosphere. The method does not generate harmful gas, only changes the surface performance of the material, and does not have great influence on the bulk property of the material, thereby having important application value.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for improving the surface flashover performance of an epoxy resin material in sulfur hexafluoride atmosphere comprises the steps of placing the epoxy resin insulating material in a high-vacuum experimental cavity, generating low-energy electron beams through an electron irradiation system, controlling the energy and beam density of the low-energy electron beams, carrying out surface treatment on the epoxy resin insulating material, changing the surface resistivity and the distribution characteristic of surface traps of the epoxy resin insulating material after the epoxy resin insulating material is subjected to the electron beam irradiation treatment, further influencing the surface flashover process, and increasing the surface resistivity and the surface flashover voltage of the epoxy resin insulating material when the deep traps are increased.
Further, the epoxy resin insulating material is an epoxy resin and epoxy group alumina micron composite material, and the preparation process of the epoxy resin and epoxy group alumina micron composite material is as follows:
1) cleaning a mold, spraying a release agent, and putting the mold into an oven at 110-130 ℃ for preheating for 2 hours;
2) adding micron alumina particles into molten epoxy resin at the temperature of 115-125 ℃, keeping the temperature at 115-125 ℃, rotating at 150rad/min, keeping the air pressure less than 100Pa, and stirring at a constant speed for 60-70 min to obtain a mixture A;
3) reducing the temperature of the mixture A to 100 ℃, adding a curing agent, keeping the temperature at 95-105 ℃, keeping the air pressure at less than 100Pa and the rotating speed at 150rad/min, and uniformly stirring for 10-15 min to obtain a mixture B;
4) pouring the mixture B into a preheated mold at 110-130 ℃ for curing, wherein the curing procedure is as follows: curing for 2 hours at 120 ℃, curing for 14 hours at 140 ℃, and naturally cooling to room temperature to obtain the epoxy resin and epoxy group alumina micron composite material with the thickness of 1-2 mm.
Further, the epoxy resin and epoxy group alumina micron composite material is cleaned and dried before being placed in a high vacuum experimental cavity, and the cleaning specifically comprises the following steps: and ultrasonically cleaning for 20min by adopting absolute ethyl alcohol, wherein the drying temperature is 40-70 ℃, and the drying time is 6-14 h.
Further, the epoxy resin is Hensman Araldite CT5531, the curing agent is Hensman Aradur HY 5533, and the mass ratio of the epoxy resin to the curing agent is 100: 38.
Furthermore, the mass fraction of the micron alumina particles in the epoxy resin and epoxy group alumina micron composite material is 68.3 wt%.
Further, the particle size of the micron alumina particles is 10 μm.
Further, the vacuum conditions in the high vacuum experimental cavity are as follows: air pressure less than 5 x 10-4Pa, and the temperature is 20-30 ℃.
Further, the low-energy electron beam has an energy of 10-20keV and a beam density of 5 × 10-4A/m2The irradiation time is 2-5 min.
Further, the epoxy resin insulating material is immediately put into SF after being subjected to electron beam radiation treatment6In the atmosphere surface flashover cavityAnd performing direct current flashover test.
Further, the SF6The air pressure in the atmosphere surface flashover cavity is a standard atmospheric pressure, and the temperature is 20-30 ℃; during the direct-current flashover test, an experimental voltage source is adopted as a direct-current voltage source, the pressurization mode is step boosting, and the boosting rate is 1 kV/s; during the direct current flashover test, the finger-type electrode is adopted, the electrode material is stainless steel, the electrode distance is 5 +/-0.05 mm, the flashover interval of two times is 2min, and each sample is subjected to a surface flashover experiment for 8 times.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention carries out surface treatment on the epoxy resin insulating material through low-energy electron beams, the surface resistivity and the surface trap parameters of the treated epoxy resin insulating material are changed, specifically, the surface resistivity is obviously improved, the energy level of the surface trap is not changed greatly, but the density of the surface deep trap is increased, and the change causes the SF of the epoxy resin material6The surface flashover performance under the atmosphere is improved.
Further, in order to make the present invention suitable for practical application, a composite material of 68.3 wt% of micron alumina particles in GIS equipment is used as a processing object of electron beam irradiation, and SF is performed6Following surface flashover experiments.
Further, when the irradiation energy of the electron beam is 20keV and the beam density is 5X 10-4A/m2When the treatment time is 2min, adding SF6And comparing the direct-current surface flashover voltage of the pure epoxy resin sample before and after treatment in the atmosphere, wherein the flashover voltage is improved by 8.25%. When the irradiation energy of the electron beam is 15keV and the beam density is 5 x 10-4A/m2When the treatment time is 5min, adding SF6Under the standard condition of atmosphere, the direct current surface flashover voltage of a composite material sample of 68.3 wt% of micron alumina particles before and after treatment is compared, and the flashover voltage is improved by 10.26%.
Further, in increasing SF6The surface flashover voltage amplitude of the epoxy resin material in the atmosphere is more than 10 percent, and simultaneously the irradiation treatment time is greatly reduced, and the treatment time is improved solid insulation medium in the prior related technologyMethod for flashover performance along vacuum surface ″) the shortest processing time is one sixth of 0.5 h.
In conclusion, the invention can obviously improve the SF of the epoxy resin insulating material6The direct current surface flashover voltage under the atmosphere is short in processing time, and can be applied to GIS basin-type insulator surface processing.
Drawings
FIG. 1 is a schematic view of a finger-type electrode, wherein (a) is a top view and (b) is a front view;
FIG. 2 is a graph showing the relationship between the irradiation time 2min, the diameter of the sample 50mm, the thickness of the sample 1.5mm, and the flashover voltage and the irradiation energy;
FIG. 3 is a graph showing the relationship between the irradiation time of 5min, the diameter of the sample of 50mm, the thickness of 1.5mm, and the flashover voltage and the irradiation energy;
FIG. 4 is an isothermal surface potential decay graph of 80 ℃, needle electrode potential-8 kV, gate electrode potential-12 kV, charging time 2min, sample diameter 50mm, thickness 1-2 mm;
FIG. 5 is a graph showing the relationship between the irradiation time 5min, the diameter of the sample 50mm, the thickness of the sample 1.5mm, and the trap density and the irradiation energy.
Detailed Description
Embodiments of the invention are described in further detail below:
for improving SF6A method for the flashover behavior of an epoxy resin material along a surface in an atmosphere. The epoxy resin and epoxy group alumina micron composite material is taken as a research object, the epoxy resin and epoxy group alumina micron composite material to be processed is placed in a high vacuum experimental cavity, a low-energy electron beam is generated through an electron irradiation system, the energy and beam density of radiation electrons are controlled, and the surface treatment is carried out on the epoxy resin and epoxy group alumina micron composite material. After the epoxy resin and epoxy group alumina micron composite material is subjected to electron beam radiation treatment, the surface resistivity and the surface trap distribution characteristics of the epoxy resin and epoxy group alumina micron composite material are changed, and further SF is improved6The surface flashover performance of the epoxy resin material under the atmosphere is high, and when the surface resistivity is high and the deep trap is increased, the surface flashover voltage of the material is increased.
Specifically, the method comprises the following steps:
s1, preparing an epoxy resin and epoxy group alumina micron composite material, which comprises the following specific steps:
1) cleaning the die, spraying a release agent, and putting the die into an oven at 110-130 ℃ for preheating for 2 hours.
2) Adding micron alumina particles into molten epoxy resin at the temperature of 115-125 ℃, keeping the temperature at 115-125 ℃, rotating at 150rad/min, keeping the air pressure less than 100Pa, and uniformly stirring for 60-70 min to obtain a mixture A, wherein the epoxy resin is Hensman Araldite CT5531, and the particle size of the micron alumina particles is 10 microns;
3) reducing the temperature of the mixture A to 100 ℃, adding a curing agent, keeping the temperature at 95-105 ℃, keeping the air pressure at less than 100Pa and the rotating speed at 150rad/min, and uniformly stirring for 10-15 min to obtain a mixture B; the curing agent is Hensman Aradur HY 5533, and the mass ratio of the epoxy resin to the curing agent is 100: 38;
4) and pouring the obtained mixture B into a preheated mold at 110-130 ℃ for curing, wherein the curing procedure is 120 ℃/2h and 140 ℃/14h, and then naturally cooling to room temperature to obtain epoxy resin and epoxy group alumina micron composite material samples with the thickness of 1-2 mm and the diameters of 50mm and 100mm respectively, wherein the mass fraction of micron alumina particles in the epoxy resin and epoxy group alumina micron composite material is 68.3 wt%, the sample with the diameter of 50mm is used for a surface potential attenuation test and a surface flashover test, and the sample with the diameter of 100mm is used for a surface resistivity test.
S2, ultrasonically cleaning the epoxy resin and epoxy group alumina micron composite material prepared in the step S1 for 20min by using absolute ethyl alcohol, and then drying the composite material in a constant-temperature air-blast drying oven at the drying temperature of 40-70 ℃ for 6-14 h;
s3, placing the material obtained in the step S2 into a vacuum cavity of an electronic radiation system (the air pressure is less than 5 multiplied by 10)-4Pa, the temperature is 20-30 ℃), a German Staib Instrument GmbH high-energy electron gun radiation system is adopted to generate low-energy electron beams, the energy and the beam density of the low-energy electron beams are controlled, and the epoxy resin and epoxy group alumina micron composite material is subjected to surface treatment. The electron gun can generate electron beam with energy of 0.1 keV-40 keV, and has continuous and adjustable beam density10nA～500μA/m2. In this step, the energy of the low-energy electron beam is 10-20keV, and the beam density is 5 × 10-4A/m2The irradiation time is 2-5 min.
S4, taking out the irradiated sample, immediately putting the sample into an SF6 atmosphere surface flashover cavity, wherein the atmosphere in the cavity is SF6Performing direct-current flashover test at the temperature of 20-30 ℃ under the atmospheric pressure of a standard atmosphere, wherein an experimental voltage source is adopted as a direct-current voltage source during the direct-current flashover test, the pressurization mode is step boosting, and the boosting rate is 1 kV/s; during the direct current flashover test, the electrode is a finger-shaped electrode (shown in figure 1), the electrode material is stainless steel, the electrode distance is 5 +/-0.05 mm, the flashover interval of two times is 2min, and the surface flashover experiment is repeated for 8 times for each sample.
The present invention is described in further detail below with reference to examples:
example 1
S1, preparing an epoxy resin and epoxy group alumina micron composite material sample, which comprises the following specific measures:
1) cleaning the die, spraying a release agent, and putting the die into a 110 ℃ oven for preheating for 2 hours.
2) Adding micron alumina particles into molten epoxy resin at 115 ℃, keeping the temperature at 115 ℃, rotating at 150rad/min, keeping the air pressure less than 100Pa, and stirring at constant speed for 60min to obtain a mixture A;
3) reducing the temperature of the mixture A to 100 ℃, adding a curing agent, keeping the temperature at 95 ℃, keeping the air pressure at less than 100Pa, and stirring at a constant speed of 150rad/min for 10min to obtain a mixture B;
4) and pouring the obtained mixture B into a preheated mold at 110 ℃ for curing, wherein the curing procedure is 120 ℃/2h +140 ℃/14h, and then cooling to room temperature to obtain a sample. The test specimens had diameters of 100mm and 50mm and a thickness of 1.5 mm.
S2, ultrasonically cleaning the sample prepared in the S1 for 20min by using absolute ethyl alcohol, and then drying the sample in a forced air drying oven at the drying temperature of 40 ℃ for 14 h.
S3, placing the dried epoxy resin and alumina micron composite sample thereof in the S2 into a vacuum cavity;
S4.the air pressure in the cavity to be vacuumized is less than 5 multiplied by 10-4Pa, opening a low-energy electron gun, and adjusting the beam current density to 5 multiplied by 10- 4A/m2；
S5, adjusting the energy of a low-energy electron beam to be 10keV, and carrying out surface electron beam irradiation treatment on the sample for 5min respectively;
s6, after irradiation is finished, closing the electron gun, opening the vacuum cavity, and taking out the sample subjected to surface electron beam irradiation treatment;
s7, placing the sample in the S6 into a flashover test cavity, wherein the atmosphere in the cavity is SF6The method comprises the following steps of selecting a finger-shaped electrode at the temperature of 20 ℃ under the atmosphere of standard atmospheric pressure, wherein the electrode is made of stainless steel, the radius of the finger of the electrode is 10mm, the distance between the electrodes is 5 +/-0.05 mm, a power supply is a direct-current power supply, and the pressurizing mode is step boosting and the boosting rate is 1 kV/s. The interval between two adjacent flashovers is 2min, and each sample is repeatedly tested for 8 times;
s8, carrying out isothermal surface potential attenuation test on the sample in the S6, wherein the experimental test temperature is 80 ℃, the sample is subjected to corona charging by adopting a pin grid electrode, the charging voltage is-8 kV of the pin electrode, the grid electrode is-12 kV of the pin electrode, the charging time is 2min, and the test time of each sample is 8000S.
Example 2
S1, preparing an epoxy resin and epoxy group alumina micron composite material sample, which comprises the following specific measures:
1) cleaning the die, spraying a release agent, and putting the die into a 120 ℃ oven for preheating for 2 hours.
2) Adding micron alumina particles into molten epoxy resin at 120 ℃, keeping the temperature at 120 ℃, rotating at 150rad/min, keeping the air pressure less than 100Pa, and stirring at constant speed for 65min to obtain a mixture A;
3) reducing the temperature of the mixture A to 100 ℃, adding a curing agent, keeping the temperature at 100 ℃, keeping the air pressure at less than 100Pa and the rotating speed at 150rad/min, and uniformly stirring for 12min to obtain a mixture B;
4) and pouring the obtained mixture B into a preheated mold at 120 ℃ for curing, wherein the curing procedure is 120 ℃/2h and 140 ℃/14h, and then cooling to room temperature to obtain a sample. The test specimens had diameters of 100mm and 50mm and a thickness of 1.5 mm.
S2, ultrasonically cleaning the sample prepared in the S1 for 20min by using absolute ethyl alcohol, and then drying the sample in a forced air drying oven at the drying temperature of 55 ℃ for 10 h.
S3, placing the dried epoxy resin and alumina micron composite sample thereof in the S2 into a vacuum cavity;
s4, the air pressure in the cavity to be vacuumized is less than 5 multiplied by 10-4Pa, opening a low-energy electron gun, and adjusting the beam current density to 5 multiplied by 10- 4A/m2；
S5, adjusting the energy of a low-energy electron beam to be 15keV, and carrying out surface electron beam irradiation treatment on the sample for 5 min;
s6, after irradiation is finished, closing the electron gun, opening the vacuum cavity, and taking out the sample subjected to surface electron beam irradiation treatment;
s7, placing the sample in the S6 into a flashover test cavity, wherein the atmosphere in the cavity is SF6The method comprises the following steps of selecting a finger-shaped electrode at the temperature of 25 ℃ under the atmosphere of standard atmospheric pressure, wherein the electrode material is stainless steel, the radius of the finger of the electrode is 10mm, the distance between the electrodes is 5 +/-0.05 mm, the power supply is a direct-current power supply, and the pressurizing mode is step boosting and the boosting rate is 1 kV/s. The interval between two adjacent flashovers is 2min, and each sample is repeatedly tested for 8 times;
s8, carrying out isothermal surface potential attenuation test on the sample in the S6, wherein the experimental test temperature is 80 ℃, the sample is subjected to corona charging by adopting a pin grid electrode, the charging voltage is-8 kV of the pin electrode, the grid electrode is-12 kV of the pin electrode, the charging time is 2min, and the test time of each sample is 8000S.
Example 3
S1, preparing an epoxy resin and epoxy group alumina micron composite material sample, which comprises the following specific measures:
1) cleaning the die, spraying a release agent, and putting the die into a 130 ℃ oven for preheating for 2 hours.
2) Adding micron alumina particles into molten epoxy resin at 125 deg.C, maintaining the temperature at 125 deg.C, rotating at 150rad/min, and stirring at constant pressure less than 100Pa for 70min to obtain mixture A;
3) reducing the temperature of the mixture A to 100 ℃, adding a curing agent, keeping the temperature at 105 ℃, keeping the air pressure at less than 100Pa, and stirring at a constant speed of 150rad/min for 15min to obtain a mixture B;
4) and pouring the obtained mixture B into a preheated mold at the temperature of 130 ℃ for curing, wherein the curing procedure is 120 ℃/2h and 140 ℃/14h, and then cooling to room temperature to obtain a sample. The test specimens had diameters of 100mm and 50mm and a thickness of 1.5 mm.
S2, ultrasonically cleaning the sample prepared in the S1 for 20min by using absolute ethyl alcohol, and then drying the sample in a forced air drying oven at the drying temperature of 70 ℃ for 6 h.
S3, placing the dried epoxy resin and alumina micron composite sample thereof in the S2 into a vacuum cavity;
s4, the air pressure in the cavity to be vacuumized is less than 5 multiplied by 10-4Pa, opening a low-energy electron gun, and adjusting the beam current density to 5 multiplied by 10- 4A/m2；
S5, adjusting the energy of a low-energy electron beam to be 20keV, and carrying out surface electron beam irradiation treatment on the sample for 5 min;
s6, after irradiation is finished, closing the electron gun, opening the vacuum cavity, and taking out the sample subjected to surface electron beam irradiation treatment;
s7, placing the sample in the S6 into a flashover test cavity, wherein the atmosphere in the cavity is SF6The method comprises the following steps of selecting a finger-shaped electrode at the temperature of 30 ℃ under the atmosphere of standard atmospheric pressure, wherein the electrode material is stainless steel, the radius of the finger of the electrode is 10mm, the distance between the electrodes is 5 +/-0.05 mm, the power supply is a direct-current power supply, and the pressurizing mode is step boosting and the boosting rate is 1 kV/s. The interval between two adjacent flashovers is 2min, and each sample is repeatedly tested for 8 times;
s8, carrying out isothermal surface potential attenuation test on the sample in the S6, wherein the experimental test temperature is 80 ℃, the sample is subjected to corona charging by adopting a pin grid electrode, the charging voltage is-8 kV of the pin electrode, the grid electrode is-12 kV of the pin electrode, the charging time is 2min, and the test time of each sample is 8000S.
By adopting the method of the invention, the epoxy group micron composite material sample SF is treated by 20keV low-energy electron radiation for 2min6Under the atmosphere, the average value of the direct current surface flashover voltage can be improved by 8.25 percent compared with that before radiation. Epoxy groups are micro-treated by 15keV low-energy electron radiation for 5minRice composite sample SF6Under the atmosphere, the average value of the direct current surface flashover voltage can be improved by 10.26 percent compared with that before radiation, and the specific result is shown in the figure.
In the attached figure 2, when the irradiation time is 2min, the mean value of the direct current surface flashover voltage of the epoxy-based micron composite material sample is increased along with the increase of the irradiation energy, and when the irradiation energy is 20keV, the direct current flashover voltage can be increased by 8.25% compared with that of the unirradiated sample.
In the attached figure 3, when the irradiation time is 5min, the direct current surface flashover voltage mean value lifting amplitude of the epoxy group micron composite material sample is increased and then reduced along with the increase of the irradiation energy, and when the irradiation energy is 15keV, the direct current flashover voltage mean value lifting amplitude is the largest, and the flashover voltage mean value lifting amplitude can reach 10.26%.
In the attached figure 5, the irradiation time is 5min, the surface trap density of the epoxy group micron composite material sample is greatly changed before and after irradiation, and the maximum amplification of the surface deep trap density of the sample is obtained when the irradiation energy is 15 keV.
For the irradiation conditions of irradiation energy of 15keV and beam density of 5 multiplied by 10-4A/m2And carrying out surface resistivity test on the epoxy group micron composite material sample with the irradiation time of 5 min.
Table 1 shows irradiation energy of 15keV and beam density of 5X 10-4A/m2And when the irradiation time is 5min, the surface resistivity of the epoxy group micron composite material sample before and after irradiation changes.
TABLE 1 surface resistivity Change of epoxy resin and epoxy alumina micro-composites before and after irradiation
TABLE 2 irradiation time 5min, flashover voltage for each example
As shown in Table 1, after irradiation, the surface resistivity of the sample is increased by one order of magnitude, and the result is logically matched with the results shown in figures 3 and 5, namely, the surface deep trap density is increased, the surface resistivity of the sample is increased, and the surface flashover performance is improved. After the electron beam impacts the surface of the sample, broken bonds and broken chains are generated on the surface layer, so that the energy level of a surface deep trap is increased, the capability of capturing carriers on the surface of the sample is enhanced, the surface charge transportation process is further realized, and the improvement of the surface flashover performance of the sample is promoted; when the energy of the electron beam is further increased, the energy level and the density of the surface deep trap are further increased, charged particles are difficult to trap after being trapped by the trap in the surface migration process, and a large amount of trapped charges can generate accumulation of space charges, distort an electric field and are not beneficial to improvement of flashover voltage.
Test results show that the surface trap energy level of the sample irradiated by the surface electron beam is basically unchanged, and the density change of the surface traps is obvious. According to the SEEA theory, the density of the surface deep traps is increased after irradiation, the surface deep traps can capture electrons transferred from the surface of the sample, and carriers captured by the deep traps can be detrapped under the action of strong external excitation to be transferred, so that the surface resistivity of the sample is improved, and the direct-current surface flashover voltage of the epoxy sample is finally improved.
The method provided by the invention can obviously improve the SF of the epoxy resin material6Direct current surface flashover voltage under atmosphere.
Claims (10)
1. A method for improving the surface flashover performance of an epoxy resin material in sulfur hexafluoride atmosphere is characterized in that the epoxy resin insulating material is placed in a high-vacuum experimental cavity, a low-energy electron beam is generated through an electron irradiation system, the energy and beam density of the low-energy electron beam are controlled, the surface treatment is carried out on the epoxy resin insulating material, the surface resistivity and the surface trap distribution characteristic of the epoxy resin insulating material are changed after the epoxy resin insulating material is subjected to the electron beam irradiation treatment, the surface flashover process is further influenced, and when the surface resistivity is high and the deep trap is increased, the surface flashover voltage of the epoxy resin insulating material is increased.
2. The method for improving the flashover performance of an epoxy resin material in a sulfur hexafluoride atmosphere according to claim 1, wherein the epoxy resin insulation material is an epoxy resin and epoxy group alumina micro composite material, and the preparation process of the epoxy resin and epoxy group alumina micro composite material is as follows:
1) cleaning a mold, spraying a release agent, and putting the mold into an oven at 110-130 ℃ for preheating for 2 hours;
2) adding micron alumina particles into molten epoxy resin at the temperature of 115-125 ℃, keeping the temperature at 115-125 ℃, rotating at 150rad/min, keeping the air pressure less than 100Pa, and stirring at a constant speed for 60-70 min to obtain a mixture A;
3) reducing the temperature of the mixture A to 100 ℃, adding a curing agent, keeping the temperature at 95-105 ℃, keeping the air pressure at less than 100Pa and the rotating speed at 150rad/min, and uniformly stirring for 10-15 min to obtain a mixture B;
4) pouring the mixture B into a preheated mold at 110-130 ℃ for curing, wherein the curing procedure is as follows: curing for 2 hours at 120 ℃, curing for 14 hours at 140 ℃, and naturally cooling to room temperature to obtain the epoxy resin and epoxy group alumina micron composite material with the thickness of 1-2 mm.
3. The method for improving the flashover performance of an epoxy resin material in a sulfur hexafluoride atmosphere as claimed in claim 2, wherein the epoxy resin and epoxy group alumina micro composite material is cleaned and dried before being placed in a high vacuum experimental chamber, and the cleaning is specifically as follows: and ultrasonically cleaning for 20min by adopting absolute ethyl alcohol, wherein the drying temperature is 40-70 ℃, and the drying time is 6-14 h.
4. The method for improving the flashover performance of an epoxy resin material along the surface in a sulfur hexafluoride atmosphere as recited in claim 2, wherein the epoxy resin is Hensman Araldite CT5531, the curing agent is Hensman Aradur HY 5533, and the mass ratio of the epoxy resin to the curing agent is 100: 38.
5. The method of claim 2, wherein the mass fraction of the micro-alumina particles in the epoxy resin and epoxy-based alumina micro-composite is 68.3 wt%.
6. The method of claim 2, wherein the micron alumina particles have a size of 10 μm.
7. The method for improving the flashover performance of the epoxy resin material along the surface in the sulfur hexafluoride atmosphere as claimed in claim 1, wherein the vacuum conditions in the high vacuum experimental chamber are as follows: air pressure less than 5 x 10-4Pa, and the temperature is 20-30 ℃.
8. The method of claim 1, wherein the low energy electron beam has an energy of 10-20keV and a beam current density of 5 x 10-4A/m2The irradiation time is 2-5 min.
9. The method of claim 1, wherein the epoxy resin insulation material is treated by electron beam irradiation and immediately placed in SF6And carrying out direct-current flashover test in the atmosphere surface flashover cavity.
10. The method of claim 9, wherein the SF is selected to enhance flashover performance of epoxy resin materials along surfaces in a sulfur hexafluoride atmosphere6The air pressure in the atmosphere surface flashover cavity is a standard atmospheric pressure, and the temperature is 20-30 ℃; during the direct-current flashover test, an experimental voltage source is adopted as a direct-current voltage source, the pressurization mode is step boosting, and the boosting rate is 1 kV/s; during the direct current flashover test, the finger-type electrodes are adopted as the electrodes, the stainless steel is adopted as the electrode material, the electrode distance is 5 +/-0.05 mm, and the two times of direct current flashover test are carried outFlashover intervals were 2min, and the surface flashover experiment was repeated 8 times per sample.
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Cited By (2)
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|---|---|---|---|---|
| CN116622110A (en) * | 2023-05-22 | 2023-08-22 | 国网河南省电力公司电力科学研究院 | Treatment method for optimizing direct current flashover and charge aggregation phenomena on surface of epoxy insulator |
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| CN116836610A (en) * | 2023-06-30 | 2023-10-03 | 西安交通大学 | Epoxy composite coating material for improving surface flashover voltage and preparation method thereof |
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