CN109830892B - Shielding electrode for corona prevention of gas sleeve and preparation process thereof - Google Patents
Shielding electrode for corona prevention of gas sleeve and preparation process thereof Download PDFInfo
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- CN109830892B CN109830892B CN201910161154.1A CN201910161154A CN109830892B CN 109830892 B CN109830892 B CN 109830892B CN 201910161154 A CN201910161154 A CN 201910161154A CN 109830892 B CN109830892 B CN 109830892B
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Abstract
The invention discloses a shielding electrode for corona prevention of a gas sleeve, which is arranged in the gas sleeve, the shielding electrode is fixedly arranged on a lower flange around a conducting rod, a semi-conducting layer is arranged on the surface of the shielding electrode, and the surface resistivity of the semi-conducting layer is 103Ω～1011Ω, the present invention also provides a preparation process for obtaining a shielding electrode for corona prevention of a gas bushing, specifically comprising the steps of, S1: pretreatment, namely sequentially carrying out oil removal, rust removal, phosphorization and passivation treatment on the shielding electrode; s2: spraying, namely spraying powder coating on the surface of the shielding electrode by adopting an electrostatic spraying method; s3: the sprayed shielding electrode is solidified at high temperature and then cooled, the surface of the shielding electrode is ensured to be smooth after solidification and molding through electrostatic spraying of the semi-conductive plastic powder, and the problem that the traditional spraying insulating paint is easy to generate electrical aging is solved due to the conductive characteristic of the semi-conductive plastic powder, so that the electrical performance of the gas sleeve can be obviously improved, and meanwhile, the process difficulty is small and the cost is low.
Description
Technical Field
The invention relates to the field of corona prevention of gas sleeve shielding electrodes, in particular to a shielding electrode for corona prevention of a gas sleeve and a preparation process thereof.
Background
The shielding electrode is arranged in the gas sleeve and mainly used for shielding the sharp angle of the metal flange at the bottom of the sleeve and preventing the sharp discharge of the inner wall of the flange. At present, most of shielding electrodes of gas sleeves are made of aluminum alloy materials. The structure and the size of the shielding electrode are optimized and designed through electric field simulation calculation, so that the partial discharge starting voltage of the gas sleeve is improved. For the surface treatment of the shielding electrode, insulating paint can be sprayed, and the voltage resistance of the product can be improved. Although the electric field distribution in the gas sleeve can be optimized by changing the electrode structure, the surface of the actually produced metal shielding electrode is not smooth, and small burrs on the surface can generate electric field distortion. The problem of surface burrs can be solved by spraying the insulating paint on the surface, but the sprayed insulating paint coating bears larger field intensity for a long time under the normal operation condition, and is easy to generate electrical aging.
Therefore, a new technical scheme is urgently needed to solve the problems in the prior art, and through the improvement of the new technology, the problem of burrs on the surface of the shielding electrode can be solved, and the electrical performance of the gas sleeve can be improved.
Disclosure of Invention
In view of the above problems in the prior art, the present invention is directed to a shielding electrode for corona prevention in a gas bushing and a process for preparing the same, which is applied to the surface of a metallic shielding electrode (ground electrode) in the gas bushing.
In order to solve the technical problems, the specific technical scheme of the invention is as follows:
in one aspect, the invention provides a shielding electrode for corona prevention of a gas bushing, wherein the shielding electrode is arranged inside the gas bushing, the gas bushing further comprises a conductive rod, an upper flange and a lower flange, and a semi-conductive layer is arranged on the surface of the shielding electrode.
Furthermore, the shielding electrode is made of aluminum alloy material.
Further, the semiconductive layer had a surface resistivity of 103Ω～1011Ω。
Preferably, the semiconductive layer has a surface resistivity of 103Ω～105Ω。
On the other hand, the invention also provides a preparation process for preparing the shielding electrode for preventing corona of the gas bushing, wherein the preparation process adopts an electrostatic powder spraying method and specifically comprises the following steps:
s1: pre-treating, namely sequentially carrying out oil removal, rust removal, phosphorization and passivation treatment on the shielding electrode;
s2: spraying, namely spraying powder coating on the surface of the shielding electrode by adopting an electrostatic spraying method;
s3: and (4) solidifying, namely solidifying the sprayed shielding electrode at a high temperature and then cooling.
Specifically, the step S1 can ensure that the surface of the shielding electrode is free from oil, rust and dust, and simultaneously, a uniform and rough phosphating film which is not easy to rust is formed on the surface of the original shielding electrode, so that the surface of the shielding electrode can prevent rust and increase the adhesive force of a plastic spraying layer.
Further, the oil removal process in step S1 includes: mixing the deoiling powder and clear water according to a mass ratio of 1: 18, heating to 60-70 ℃, and then cleaning the shielding electrode.
Further, the phosphating treatment comprises the following steps: and immersing the shielding electrode into phosphate solution, wherein the phosphating temperature is 50-60 ℃.
Further, the powder coating is semiconductive plastic powder, and the semiconductive plastic powder comprises the following components in parts by mass: 70 parts of bisphenol A type epoxy resin, 18 parts of conductive carbon black, 4 parts of curing agent, 3 parts of accelerant, 2 parts of flatting agent and 3 parts of fumed silica.
Specifically, the conductive carbon black needs to be subjected to a grinding treatment in advance in order to secure a later surface condition.
Further, in the step S2, the electrostatic spraying distance is 250mm to 300mm, the electrostatic spraying voltage is set to 90kV, the spraying time is 19S to 23S, the spraying amount is 57g/min to 62g/min, and the ambient humidity is 50% to 60%.
Further, in the step S3, the curing temperature is 180 to 190 ℃, and is maintained for 16 min.
Preferably, the curing temperature in the step S3 is 185 ℃.
And further, after the high-temperature curing is finished, taking out the shielding electrode, and cooling, wherein the whole electrostatic spraying step is finished.
By adopting the technical scheme, the shielding electrode for preventing corona of the gas sleeve and the preparation process thereof have the following beneficial effects:
1. according to the shielding electrode for preventing corona of the gas sleeve and the preparation process thereof, the surface of the shielding electrode is smooth after the semi-conducting layer is sprayed, and the problem of high surface roughness of the shielding electrode is solved.
2. According to the shielding electrode for preventing corona of the gas sleeve and the preparation process thereof, the semi-conducting layer has the conductive characteristic and is in close contact with the metal shielding electrode, so that zero potential can be formed, and the electric field intensity on the burr surface of the metal electrode is reduced. Meanwhile, the field intensity born by the coating is very small, and the problem that the traditional spraying insulating paint is easy to generate electric aging is solved.
3. The shielding electrode for corona prevention of the gas bushing and the preparation process thereof can obviously improve the electrical performance of the gas bushing, particularly obviously improve the internal breakdown voltage, the power frequency withstand voltage and the partial discharge initial voltage of the gas bushing, and have small process difficulty and low cost.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural diagram of a shield electrode for corona prevention of a gas bushing according to the present invention;
FIG. 2 is a step diagram of a process for preparing a shield electrode for corona prevention in a gas bushing according to the present invention.
In the figure: 10-shield electrode, 20-gas sleeve, 30-conducting rod, 40-semi-conducting layer, 50-upper flange, 60-lower flange.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present invention and the above-described drawings, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
The traditional shielding electrode without surface treatment has limited processing precision, tiny burrs exist on the surface, local electric field distortion is caused, and insulating gas at the position can be firstly broken down to generate discharge when the electric field is higher. The problem of surface burrs can be solved by spraying the insulating paint on the surface, but the sprayed insulating paint coating bears larger field intensity for a long time under the normal operation condition, and is easy to generate electrical aging. Therefore, the present embodiment provides a shielding electrode for corona prevention of a gas bushing, as shown in fig. 1, a shielding electrode 10 is disposed at the bottom of a gas bushing 20, and a conductive rod 30 is fixed to an upper flange 50 and penetrates through the inside of the gas bushing 20, the shielding electrode 10 is disposed around the bottom end of the conductive rod 30 and fixed to a lower flange 60, and a semi-conductive layer 40 is sprayed on the surface of the shielding electrode 10 for improving the voltage endurance of the shielding electrode, wherein the shielding electrode 10 is made of an aluminum alloy material, which is used as a conventional electrode raw material and is convenient for obtaining materials and reducing cost. The gas bushing 20 is filled with an insulating gas, which may be SF6 or N2.
In some embodiments, the semiconductive layer 40 has a surface resistivity of 103Ω～1011Ω。
In some embodiments, only the inner surface of the shielding electrode 10 is sprayed with the semiconducting layer 40.
In other embodiments, the semiconductive layer 40 is sprayed onto both the inner and outer surfaces of the shielding electrode 10.
The shielding electrode for the corona prevention of the gas bushing can achieve the following beneficial effects: after the semi-conducting layer is sprayed, the surface of the shielding electrode is smooth, and the problem of high surface roughness of the shielding electrode is solved; the semi-conducting layer has the conductive characteristic and can be in close contact with the metal shielding electrode to form zero potential, so that the electric field intensity on the burr surface of the metal electrode is reduced. Meanwhile, the field intensity born by the coating is very small, so that the problem that the traditional spraying insulating paint is easy to generate electric aging is solved; the electric performance of the gas sleeve can be obviously improved by spraying the semi-conducting layer, the internal breakdown voltage, the power frequency withstand voltage and the partial discharge starting voltage of the gas sleeve are obviously improved, and the process difficulty is low and the cost is low.
Example 2, a preferred example of example 1
The present embodiment provides a shield electrode for corona prevention of a gas bushing, the shield electrode 10 is disposed inside the gas bushing 20, a conductive rod 30 is disposed in the gas bushing 20, and a semiconductive layer 40 is disposed on a surface of the shield electrode 10.
In some embodiments, the shielding electrode 10 is made of an aluminum alloy material.
Preferably, the semiconductive layer 40 has a surface resistivity of 103Ω～105Ω。
Of course, the surface resistivity of the semiconducting layer may be adjusted accordingly according to the requirements of different gas-insulated bushings and different materials or structures of the shielding electrode.
The beneficial effects obtained by the shielding electrode provided above are substantially the same as those of the above embodiments, and are not repeated herein.
Example 3
This embodiment proposes a manufacturing process of a shielding electrode for corona prevention of a gas bushing on the basis of the above embodiments, and the manufacturing process is used to obtain the above shielding electrode for corona prevention of a gas bushing. The preparation process adopts an electrostatic powder spraying method, and the working principle of the electrostatic powder spraying method is as follows: the coating material sprayed by the electrostatic powder spray gun is dispersed and the powder particles are charged with negative charges, the charged powder particles are coated on the grounded object under the action of air flow (or other acting force such as centrifugal force) and electrostatic attraction, and then the coating material is heated and melted to be solidified into a film.
The specific spraying process is as follows:
firstly, carrying out electrostatic spraying pretreatment, including oil removal, rust removal, phosphorization and passivation; the detailed steps are that firstly, degreasing operation is carried out by using degreasing powder, specifically, the powder is taken out according to a certain proportion, and preferably, the mass ratio of the degreasing powder to water is 1: 18, dissolving in a cleaning tank, heating the cleaning tank to 60-70 ℃ for cleaning, and washing with clean water after cleaning oil stains.
Of course, other than this degreasing method, the same effect can be obtained if there are other ways.
And then, carrying out surface phosphating treatment, namely immersing the shielding electrode into phosphate solution, wherein the phosphating temperature is 50-60 ℃, a rough phosphating layer can be generated on the surface after phosphating, and the phosphating layer is beneficial to increasing the adhesive force of the plastic spraying layer and influencing the service life of the plastic spraying coating.
And entering a formal electrostatic spraying step after the pretreatment, wherein the spraying distance is required to be 250-300 mm, the electrostatic spraying voltage is set to be 90kV, the flow velocity pressure is controlled to be 0.5Mpa, the spraying time is controlled to be 19-23 s, the spraying amount is 57-62 g/min, and the environmental humidity is required to be ensured to be 50-60%.
After the spraying is finished, curing treatment is needed, the sprayed shielding electrode is put into an oven for high-temperature curing, specifically, the curing temperature is 180-190 ℃, and is kept for 16min, although generally, the curing temperature is 185 ℃. And (5) cooling and taking out after solidification is finished, and finishing the electrostatic spraying step.
In some embodiments, the spray powder is a semi-conductive molding powder having a surface resistivity of 103Ω～1011Omega, can realize the effect of preventing corona through spraying the semiconductive plastic powder on the shielding electrode, of course, can also choose the semiconductive paint of the same surface resistivity range, can also reach the same technological effect.
Specifically, the formula of the semiconductive plastic powder comprises the following components in percentage by mass: 70 parts of bisphenol A type epoxy resin, 18 parts of conductive carbon black, 4 parts of curing agent, 3 parts of accelerator, 2 parts of flatting agent and 3 parts of fumed silica.
It is particularly noted that the conductive carbon black needs to be ground prior to blending to ensure later surface conditions.
Of course, the conductive carbon black is only used as a conductive filler, and can be replaced by other materials, such as graphite, graphene, carbon nanotubes, and the like, and is used according to actual manufacturing conditions.
The shielding electrode provided by the embodiment can be obtained through the preparation process of the shielding electrode for corona prevention of the gas bushing, the process difficulty is low, the cost is low, and the electrical performance of the gas bushing can be obviously improved.
While the invention has been described with reference to specific embodiments, it will be appreciated by those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the invention can be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The utility model provides a shield electrode for gas sleeve pipe anticorona, its characterized in that, shield electrode sets up inside gas sleeve pipe, gas sleeve pipe still includes conducting rod, upper flange and lower flange, shield electrode centers on the conducting rod fixed set up in on the lower flange, shield electrode's internal surface and surface are equipped with semi-conducting layer, semi-conducting layer's surface resistivity is 103Ω～105Ω。
2. The shielding electrode for corona prevention of gas bushing as claimed in claim 1, wherein said shielding electrode is made of aluminum alloy material.
3. A preparation process of a shielding electrode for preventing corona of a gas bushing, which is used for preparing the shielding electrode for preventing corona of the gas bushing as claimed in claim 1 or 2, wherein the preparation process adopts an electrostatic powder spraying method, and comprises the following steps:
s1: pre-treating, namely sequentially carrying out oil removal, rust removal, phosphorization and passivation treatment on the shielding electrode;
s2: spraying, namely spraying powder coating on the surface of the shielding electrode by adopting an electrostatic spraying method;
s3: and (4) solidifying, namely solidifying the sprayed shielding electrode at a high temperature, and then cooling.
4. The process for preparing a shielding electrode for gas bushing corona protection according to claim 3, wherein said degreasing treatment comprises: mixing the deoiling powder and clear water according to a mass ratio of 1: 18, heating to 60-70 ℃, and then cleaning the shielding electrode.
5. The process for preparing a shielding electrode for gas bushing corona prevention according to claim 3, wherein said phosphating includes: and immersing the shielding electrode into phosphate solution, wherein the phosphating temperature is 50-60 ℃.
6. The process for preparing the shielding electrode for the corona prevention of the gas bushing as recited in claim 3, wherein the powder coating is a semi-conductive molding powder, and the semi-conductive molding powder comprises the following components in percentage by mass: 70 parts of bisphenol A type epoxy resin, 18 parts of conductive carbon black, 4 parts of curing agent, 3 parts of accelerant, 2 parts of flatting agent and 3 parts of fumed silica.
7. The process for preparing a shielding electrode for a gas bushing anticorona as set forth in claim 6, wherein said conductive carbon black is subjected to a grinding treatment in advance.
8. The process for preparing a shielding electrode for a gas bushing corona-proof as claimed in claim 3, wherein in step S2, the distance of electrostatic spraying is 250 mm-300 mm, the voltage of electrostatic spraying is set to 90kV, the spraying time is 19S-23S, the spraying amount is 57 g/min-62 g/min, and the ambient humidity is 50% -60%.
9. The process for preparing a shielding electrode for a gas bushing anticorona as set forth in claim 3, wherein in said step S3, the curing temperature is 180-190 ℃ and is maintained for 16 min.
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| CN201910161154.1A CN109830892B (en) | 2019-03-04 | 2019-03-04 | Shielding electrode for corona prevention of gas sleeve and preparation process thereof |
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| CN201910161154.1A CN109830892B (en) | 2019-03-04 | 2019-03-04 | Shielding electrode for corona prevention of gas sleeve and preparation process thereof |
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| CN109830892B true CN109830892B (en) | 2020-08-28 |
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| JP3306345B2 (en) * | 1997-07-14 | 2002-07-24 | 三菱電線工業株式会社 | Method of forming semiconductive layer for high voltage shield electrode |
| CN207367704U (en) * | 2017-10-27 | 2018-05-15 | 江苏神马电力股份有限公司 | Protective jacket and insulating sleeve for insulating sleeve repairing |
| CN207718954U (en) * | 2017-12-01 | 2018-08-10 | 江苏神马电力股份有限公司 | composite insulator and composite bushing |
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