CN108484954B - GIL insulator design method with surface conductance two-dimensional U-shaped gradient distribution - Google Patents
GIL insulator design method with surface conductance two-dimensional U-shaped gradient distribution Download PDFInfo
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- CN108484954B CN108484954B CN201810168067.4A CN201810168067A CN108484954B CN 108484954 B CN108484954 B CN 108484954B CN 201810168067 A CN201810168067 A CN 201810168067A CN 108484954 B CN108484954 B CN 108484954B
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Abstract
The invention discloses a GIL insulator design method with surface conductance two-dimensional U-shaped gradient distribution, which mainly comprises the following steps: firstly, manufacturing an epoxy resin insulation sample; then, treating the epoxy resin by adopting a step curing method; and finally, performing linear gradient design on the surface of the epoxy resin basin-type insulator: dividing the surface of the insulator into five tightly connected annular regions from inside to outside, and designing the surface conductance to be increased after being reduced; and placing the sample in fluorination treatment equipment, and treating the sample at different positions for different time according to the monotone distribution gradient to obtain the basin-type insulator with the surface conductance gradient distribution. The surface conductance two-dimensional U-shaped gradient distribution is obtained by performing gradient fluorination treatment on the epoxy resin so as to improve the performance of the insulator.
Description
Technical Field
The invention belongs to the field of high-voltage equipment manufacturing, and particularly relates to a method for designing a GIL insulator with surface conductance two-dimensional U-shaped gradient distribution.
Background
With the rapid development of high-voltage power transmission systems, the insulation problem of electrical equipment is increasingly prominent, and the design and manufacture of the electrical equipment are more and more important. High Voltage Direct Current (HVDC) has obvious advantages in the aspects of long-distance large-capacity power transmission, asynchronous alternating current power grid interconnection, offshore platform and island power transmission, renewable energy power generation grid connection, large city power supply capacity increase and the like, is developed rapidly, and urgently needs corresponding switch equipment and power transmission lines matched with the HVDC. However, existing research and applications indicate that designing and manufacturing a safe and reliable dc GIL remains a challenge. In the long-term operation process of the insulator under the direct current condition, the electric field in a local area can be distorted due to rapid change of dielectric parameters, so that discharge and insulation aging are caused, and further equipment failure can be caused. Therefore, the surface design is carried out on the basin-type insulator, so that the basin-type insulator has surface conductance two-dimensional U-shaped gradient distribution, a new thought is provided for further improving the reliability of the GIL insulator, and the surface conductance two-dimensional U-shaped gradient distribution is significant for promoting the further development of a direct-current power system.
Epoxy resin is mostly used for fixing and supporting the basin-type insulator of the high-voltage conductor, mainly because of its excellent electrical and mechanical properties. The invention uses fluorine gas for the surface treatment of the epoxy basin-type insulator, forms a surface gradient fluoride layer by controlling the fluorination condition, changes the surface conductance of the surface gradient fluoride layer and ensures that the basin-type insulator has surface conductance two-dimensional U-shaped gradient distribution. Researches show that the surface conductivity value of the epoxy basin-type insulator after the gradient fluorination treatment is increased and the distribution is optimized. Therefore, the design and manufacture of the surface gradient fluorinated modified basin-type insulator have important theoretical value and engineering significance for improving the performance of the GIL insulator and the safety of a direct-current transmission system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a GIL insulator design method with surface conductance two-dimensional U-shaped gradient distribution, wherein the surface conductance two-dimensional U-shaped gradient distribution is obtained by performing gradient fluorination treatment on epoxy resin so as to improve the performance of the insulator. The epoxy resin insulator after the gradient fluorination treatment is provided with a fluorination surface layer with gradient thickness, has surface conductivity two-dimensional U-shaped gradient distribution, optimizes the structure of materials, regulates and controls the distribution of an electric field, and improves the electricity resistance of the GIL insulator and the safety of a direct current transmission system.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for designing the GIL insulator with the surface conductance two-dimensional U-shaped gradient distribution comprises the following steps:
1) preparing an epoxy resin insulation sample:
(1) mixing epoxy resin, a curing agent and alumina according to the proportion of 100: 38: 330 percent of the mixture is added into a mixing tank to obtain an epoxy resin mixed material, and the temperature is 130 ℃;
(2) starting a motor for stirring and vacuum degassing;
(3) preheating the mold, pushing into a casting tank, and evacuating;
(4) pouring the epoxy resin mixed material in the step (1) into a mold;
2) the epoxy resin is treated by a step curing method, and the curing process comprises two steps:
(1) putting the mould subjected to vacuum treatment into an oven for primary curing, and then demoulding;
(2) placing the insulator into an oven for secondary curing, and cooling to obtain the epoxy resin basin-type insulator;
3) performing linear gradient design on the surface of the epoxy resin basin-type insulator in the step 2):
(1) dividing the surface of the insulator into five tightly connected annular regions from inside to outside, and designing the surface conductance to be increased after being reduced;
(2) and placing the sample in fluorination treatment equipment, and treating the sample at different positions for different time according to the monotone distribution gradient to obtain the basin-type insulator with the surface conductivity gradient distribution.
The step 3) is specifically that the sample is placed in fluorination treatment equipment, and the sample is treated at different positions for different time according to a monotone distribution gradient, wherein the fluorination treatment time is respectively 60min, 30min, 0min, 30min and 60min from inside to outside, and the temperature is 25 ℃.
The step 3) is specifically that the sample is placed in fluorination treatment equipment, and the sample is treated at different positions for different time according to a monotone distribution gradient, wherein the fluorination treatment time is 45min, 15min, 0min, 15min and 45min from inside to outside, and the temperature is 25 ℃.
The step 3) is specifically that the sample is placed in fluorination treatment equipment, and the sample is treated at different positions for different time according to a monotone distribution gradient, wherein the fluorination treatment time is respectively 20min, 5min, 0min, 5min and 20min from inside to outside, and the temperature is 25 ℃.
The epoxy resin in the step 1) is preferably imported into the United states Hensman brand CT 5531.
The curing agent in the step 1) is preferably HY 5533.
The gas used by the fluorination treatment equipment in the step (2) in the step 2) is N2/F24/1 in a volume ratio of
Advantageous effects
According to the invention, the epoxy resin is subjected to gradient fluorination treatment to obtain the surface modified epoxy resin, and surface conductivity gradient distribution is formed by controlling fluorination conditions, so that the material structure is optimized, the electric field distribution is regulated and controlled, and the performance of the insulator is improved. Therefore, 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.
Drawings
FIG. 1 is a flow chart for making a DC epoxy basin insulator;
FIG. 2 is a simulation designed epoxy resin basin insulator with surface conductance two-dimensional U-shaped gradient distribution
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 relates to a design method of a GIL insulator with surface conductance two-dimensional U-shaped gradient distribution, wherein the casting material of a direct current basin-type insulator is American imported Hensman CT5531 epoxy resin and HY5533 curing agent; the gas used for fluorination being N2/F24/1, and is provided by Tianjin, encyclopedia gas Co. FIG. 1 is a flow chart for making a DC epoxy basin insulator; fig. 2 is a simulation designed epoxy resin basin insulator with surface conductance two-dimensional U-shaped gradient distribution.
Example 1
1) Mixing epoxy resin, a curing agent and alumina according to the proportion of 100: 38: adding 330 parts of the mixture into a mixing tank, starting a motor to stir at the temperature of 130 ℃, and performing vacuum degassing; pushing the preheated mould into a casting tank for evacuation treatment; and pouring the mixed epoxy resin mixed material into a mould through pouring equipment.
2) The epoxy resin is treated by a step curing method, and the curing process comprises two steps: and firstly, placing the mold after vacuum treatment into an oven for primary curing, then demolding, placing into the oven again for secondary curing, and cooling to obtain the epoxy resin basin-type insulator.
3) The surface of the basin-type insulator is designed in a U-shaped gradient mode, the surface of the insulator is divided into five tightly connected annular regions from inside to outside, and the surface conductance is designed to be reduced and then increased. And (3) placing the sample in fluorination treatment equipment, treating the sample at different positions for different times according to the U-shaped distribution gradient, wherein the fluorination treatment time is 60min, 30min, 0min, 30min and 60min from inside to outside, and the temperature is 25 ℃, so that the basin-type insulator with the surface conductance distributed in the linear gradient manner can be obtained.
Example 2
1) Mixing epoxy resin, a curing agent and alumina according to the proportion of 100: 38: adding 330 parts of the mixture into a mixing tank, starting a motor to stir at the temperature of 130 ℃, and performing vacuum degassing; pushing the preheated mould into a casting tank for evacuation treatment; and pouring the mixed epoxy resin mixed material into a mould through pouring equipment.
2) The epoxy resin is treated by a step curing method, and the curing process comprises two steps: and firstly, placing the mold after vacuum treatment into an oven for primary curing, then demolding, placing into the oven again for secondary curing, and cooling to obtain the epoxy resin basin-type insulator.
3) The surface of the basin-type insulator is designed in a U-shaped gradient mode, the surface of the insulator is divided into five tightly connected annular regions from inside to outside, and the surface conductance is designed to be reduced and then increased. And (3) placing the sample in fluorination treatment equipment, treating the sample at different positions for different times according to the U-shaped distribution gradient, wherein the fluorination treatment time is 45min, 15min, 0min, 15min and 45min from inside to outside, and the temperature is 25 ℃, so that the basin-type insulator with the surface conductance distributed in the linear gradient manner can be obtained.
Example 3
1) Mixing epoxy resin, a curing agent and alumina according to the proportion of 100: 38: adding 330 parts of the mixture into a mixing tank, starting a motor to stir at the temperature of 130 ℃, and performing vacuum degassing; pushing the preheated mould into a casting tank for evacuation treatment; and pouring the mixed epoxy resin mixed material into a mould through pouring equipment.
2) The epoxy resin is treated by a step curing method, and the curing process comprises two steps: and firstly, placing the mold after vacuum treatment into an oven for primary curing, then demolding, placing into the oven again for secondary curing, and cooling to obtain the epoxy resin basin-type insulator.
3) The surface of the basin-type insulator is designed in a U-shaped gradient mode, the surface of the insulator is divided into five tightly connected annular regions from inside to outside, and the surface conductance is designed to be reduced and then increased. And (3) placing the sample in fluorination treatment equipment, treating the sample at different positions for different times according to the U-shaped distribution gradient, wherein the fluorination treatment time is respectively 20min, 5min, 0min, 5min and 20min from inside to outside, and the temperature is 25 ℃, so that the basin-type insulator with the surface conductance distributed in the linear gradient manner can be obtained.
Fig. 2 shows that the epoxy resin insulator after the gradient fluorination treatment has a fluorinated surface layer with a gradient thickness, has surface conductance two-dimensional U-shaped gradient distribution, optimizes the structure of the material, regulates the distribution of an electric field, and improves the electrical resistance of the GIL insulator and the safety of a direct-current transmission system.
Claims (7)
1. The method for designing the GIL insulator with the surface conductance two-dimensional U-shaped gradient distribution is characterized by comprising the following steps of:
1) preparing an epoxy resin insulation sample:
(1) mixing epoxy resin, a curing agent and alumina according to the proportion of 100: 38: 330 percent of the mixture is added into a mixing tank to obtain an epoxy resin mixed material, and the temperature is 130 ℃;
(2) starting a motor for stirring and vacuum degassing;
(3) preheating the mold, pushing into a casting tank, and evacuating;
(4) pouring the epoxy resin mixed material in the step (1) into a mold;
2) the epoxy resin is treated by a step curing method, and the curing process comprises two steps:
(1) putting the mould subjected to vacuum treatment into an oven for primary curing, and then demoulding;
(2) placing the insulator into an oven for secondary curing, and cooling to obtain the epoxy resin basin-type insulator;
3) carrying out U-shaped gradient design on the surface of the epoxy resin basin-type insulator in the step 2):
(1) dividing the surface of the insulator into five tightly connected annular regions from inside to outside, and designing the surface conductance to be increased after being reduced;
(2) and placing the sample in fluorination treatment equipment, and treating the sample at different positions for different time according to the monotone distribution gradient to obtain the basin-type insulator with the surface conductivity gradient distribution.
2. The GIL insulator design method with the two-dimensional U-shaped gradient distribution of the surface conductance according to claim 1, wherein the step 3) is specifically that a sample is placed in fluorination treatment equipment, and the sample is treated at different positions for different time periods according to the monotone distribution gradient, wherein the fluorination treatment time periods from inside to outside are respectively 60min, 30min, 0min, 30min and 60min, and the temperature is 25 ℃.
3. The GIL insulator design method with the two-dimensional U-shaped gradient distribution of the surface conductance according to claim 1, wherein the step 3) is specifically that a sample is placed in fluorination treatment equipment, and the sample is treated at different positions for different time periods according to the monotone distribution gradient, wherein the fluorination treatment time periods from inside to outside are 45min, 15min, 0min, 15min and 45min respectively, and the temperature is 25 ℃.
4. The GIL insulator design method with the two-dimensional U-shaped gradient distribution of the surface conductance according to claim 1, wherein the step 3) is specifically that a sample is placed in fluorination treatment equipment, and the sample is treated at different positions for different time periods according to the monotone distribution gradient, wherein the fluorination treatment time periods from inside to outside are respectively 20min, 5min, 0min, 5min and 20min, and the temperature is 25 ℃.
5. The GIL insulator design method with surface conductance two-dimensional U-shaped gradient distribution according to claim 1, wherein said epoxy resin in step 1) is American import Henschel brand CT 5531.
6. The GIL insulator design method with the two-dimensional U-shaped gradient distribution of the surface conductance according to claim 1, wherein the curing agent in the step 1) is HY 5533.
7. The GIL insulator design method with surface conductance two-dimensional U-shaped gradient distribution as claimed in claim 1, wherein said gas used in step 2) fluorination treatment equipment is N2/F24/1 in a volume ratio.
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| CN109767884B (en) * | 2018-12-29 | 2020-07-10 | 南方电网科学研究院有限责任公司 | Manufacturing method of GI L insulator with surface conductance gradient distribution |
| CN109659102A (en) * | 2018-12-29 | 2019-04-19 | 天津大学 | GIL the flashover voltage of the insulator improvement method based on gas-solid interface electric Field Optimization |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840757A (en) * | 2010-05-21 | 2010-09-22 | 扬州东宇电气有限公司 | Manufacturing method for environment-friendly type insulator shell |
| CN105542399A (en) * | 2016-01-18 | 2016-05-04 | 西安交通大学 | Centrifugal manufacturing method for dielectric functional gradient insulator |
| CN105679473A (en) * | 2016-01-18 | 2016-06-15 | 西安交通大学 | Lamination fabrication method of dielectric functionally graded insulator |
| CN107578861A (en) * | 2017-09-01 | 2018-01-12 | 云南电网有限责任公司电力科学研究院 | Charge injection and device under a kind of transient suppression electric field |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840757A (en) * | 2010-05-21 | 2010-09-22 | 扬州东宇电气有限公司 | Manufacturing method for environment-friendly type insulator shell |
| CN105542399A (en) * | 2016-01-18 | 2016-05-04 | 西安交通大学 | Centrifugal manufacturing method for dielectric functional gradient insulator |
| CN105679473A (en) * | 2016-01-18 | 2016-06-15 | 西安交通大学 | Lamination fabrication method of dielectric functionally graded insulator |
| CN107578861A (en) * | 2017-09-01 | 2018-01-12 | 云南电网有限责任公司电力科学研究院 | Charge injection and device under a kind of transient suppression electric field |
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