CN110923708A - Method for inhibiting metal particle movement in GIL - Google Patents

Method for inhibiting metal particle movement in GIL Download PDF

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Publication number
CN110923708A
CN110923708A CN201911233965.4A CN201911233965A CN110923708A CN 110923708 A CN110923708 A CN 110923708A CN 201911233965 A CN201911233965 A CN 201911233965A CN 110923708 A CN110923708 A CN 110923708A
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gil
outer cavity
dielectric layer
coated
film
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律方成
詹振宇
谢庆
赵正杨
马康
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North China Electric Power University
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North China Electric Power University
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00

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  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

The present invention provides a method for inhibiting the movement of metal particles within a GIL comprising: 1) before assembling the GIL outer cavity, firstly, heating an area to be coated with a dielectric layer on the inner surface of the GIL outer cavity to 230-240 ℃ by adopting a film-coated iron technology, and then coating the dielectric layer with the thickness of 90-110 microns on the GIL by adopting a hot-melting film-coated iron technology; 2) and coating polyurethane adhesive on the surface of the coated dielectric layer to obtain the treated GIL outer cavity for inhibiting the movement of metal particles in the GIL. The method can effectively inhibit the metal particles in the GIL from moving to the position near the insulator with relatively weak insulation, and effectively reduce the phenomenon of system insulation performance reduction caused by the particles under normal working voltage.

Description

Method for inhibiting metal particle movement in GIL
Technical Field
The invention relates to the field of high-voltage power transmission and transformation of electrical engineering, in particular to a method for inhibiting metal particles in GIL from moving.
Background
Because of the advantages of large transmission capacity, high safety and reliability, long service life, small occupied area and the like, a Gas Insulated metal enclosed transmission Line (GIL) is widely applied to environments with high difficulty in building overhead lines, difficulty in land acquisition and the like, and becomes a development direction of large-scale and high-voltage transmission in the future. However, some metal particles are inevitably generated in the production, transportation, installation and operation processes of the GIL, and the metal particles are subjected to the action of an electric field force in the GIL to move, and finally the metal particles are possibly attached to the surface of the insulator due to the movement, so that not only can local field intensity distortion in the GIL be caused, but also accidents such as surface flashover and even insulation breakdown of the insulator can be caused, and the insulation performance of the system is seriously reduced, and statistically, the system fault caused by the movement of the metal particles at the present stage is the most main fault of the system, and accounts for more than 25%. Therefore, the movement of metal particles in the system is effectively inhibited, and the failure rate of the GIL system can be obviously reduced and the power transmission reliability of the GIL system can be improved.
The currently adopted methods for dealing with metal particles mainly include: metal particles are aged, a particle trap is provided on the inner surface of an equipment case, a dielectric layer is coated on the surface of an electrode, and the like, and the coating of the dielectric layer on the inner surface of the electrode is popular in practical engineering and attention of researchers because the method is simple and the effect is remarkable. Firstly, the high resistance of the dielectric layer hinders the development of pre-discharge in gas, thereby improving the breakdown voltage of the air gap; secondly, the dielectric layer can obviously improve the electric field intensity required by lifting particles on the inner surface of the GIL shell; moreover, the coating of the dielectric layer can obviously reduce the charge quantity brought by micro-discharge and conduction at the collision moment of the particles and the electrodes, thereby reducing the partial discharge between the particles and the electrodes; and the method is convenient to process, safe and reliable, and does not need to change the body structure of the original GIL.
In the method for coating the non-viscous medium layer on the inner surface of the outer cavity in the prior art, the medium layer is coated on the inner surface of the outer cavity through an adhesive at normal temperature, the method can play a certain role in inhibiting the lifting and movement of particles, but the medium layer can fall off along with the failure of the adhesive, so that the service life is influenced; in addition, the effect of suppressing the movement of the fine particles is also to be improved.
Therefore, a method for inhibiting the movement of metal particles within the GIL is needed.
Disclosure of Invention
The present invention addresses the deficiencies in the art by providing a method for inhibiting the movement of metal particles within a GIL.
In order to achieve the purpose, the invention adopts the following technical scheme.
The invention provides a method for inhibiting the movement of metal particles in GIL, which is characterized by comprising the following steps:
1) before assembling the GIL outer cavity, firstly heating an area of the GIL outer cavity to be coated with a dielectric layer to 230-240 ℃ by adopting a film-coated iron technology, and then coating the dielectric layer with the thickness of 90-110 microns on the GIL by adopting a hot-melting film-coated iron technology;
2) and coating polyurethane adhesive on the surface of the coated dielectric layer to obtain the treated GIL outer cavity for inhibiting the movement of metal particles in the GIL.
Preferably, the hot-melt film iron coating technology is adopted to coat a dielectric layer with the thickness of 90-110 μm on the inner surface of the GIL, and comprises the following steps: when the linear speed of the outer cavity rotating in the clockwise direction reaches v ═ 1.5-5 mm/s, film coating is carried out, and the pressure is 1.0-1.4 kg/mm2And the pressure and the rotating speed are kept unchanged in the film covering process.
Preferably, in the step 1), before the assembly of the GIL outer cavity, the region of the inner surface of the outer cavity, which is to be coated with the dielectric layer, is subjected to chromium plating treatment, and a layer of the dielectric layer with the thickness of 50-150 mg/m is electroplated2A metallic chromium layer of (c).
Preferably, the step 1) of coating a 90-110 μm thick PET dielectric layer on the GIL by using a hot-melt film-coated iron technology comprises the following steps: will be 110 μm thick and 1.05D long2The dielectric layer is wound on the film covering roller, and the distance between the film covering roller and the inner surface of the outer cavity is kept between 30 and 100mm, wherein D2Is the inner diameter of the pipeline of the GIL outer cavity.
Preferably, in the step 1), firstly, the outer cavity of the region of the GIL basin-type insulator to be coated with the dielectric layer is heated to 230-240 ℃ by adopting a film-coated iron technology, and the method comprises the following steps: heating the region of the outer cavity to be coated with the dielectric layer to 235 ℃, adjusting the minimum distance between the axis of the laminating roller and the axis of the outer cavity to be 90-110 microns, and fixing a connecting rod between the laminating roller and the axis of the outer cavity in a vertical downward direction.
Preferably, the dielectric layer is a PET solid dielectric layer.
Preferably, the area of the GIL outer cavity to be coated with the dielectric layer is 200-250 mm in front of and behind the GIL basin-type insulator.
According to the technical scheme provided by the method for inhibiting the movement of the metal particles in the GIL, the processing technology is simple and easy to implement, no redundant mechanical structure is added in the GIL, and the distortion influence on the field intensity in the GIL tank body is reduced to the maximum extent; the hot-melt film-coated iron technology is adopted for coating the dielectric layer, so that the adhesion effect of the dielectric layer and the inner surface of the outer cavity can be enhanced to a great extent, and the dielectric layer is prevented from falling off due to long-time operation of the system; compared with a non-viscous medium layer, the viscous glue is coated on the medium layer, the viscous medium layer can further improve the lifting field intensity of the particles which move horizontally and vertically, can effectively inhibit the metal particles in the GIL from moving to the position near the insulator with relatively weak insulation, and effectively reduces the phenomenon of system insulation performance reduction caused by the particles under normal working voltage; meanwhile, the structure of the body of the conventional GIL does not need to be changed, the emission of pollutants is not generated, and the method is simple to operate, convenient to implement, good in economical efficiency and high in industrial applicability.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a hot melt roll lamination technique;
FIG. 2 is a front view of a GIL pipeline hot melt laminated iron system;
FIG. 3 is a schematic diagram of an effect elevation after an outer cavity is coated with a dielectric layer;
FIG. 4 is a graph showing the results of vertical field intensity of metal particles applied with a non-adhesive medium layer and an adhesive medium layer on the surfaces of a bare electrode and a ground electrode when an AC voltage is applied between flat electrodes in an air environment.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It should be understood that the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
To facilitate understanding of the embodiments of the present invention, the following description will be further explained by taking specific embodiments as examples with reference to the accompanying drawings.
Examples
The coated iron is a metal and nonmetal layered composite strip, and is prepared by coating nonmetal materials on the surface of metal materials by a specific process. The film coating technology can be divided into three types: gluing method film-coating technique, film-coating technique and hot-melting film-coating technique. Wherein, the film covering by the gluing method is a room-temperature gluing film covering, and the rest two films are hot film covering. The film coating by the adhesive method is to adhere the metal substrate and the polyester film together by an adhesive, the film coating process adopts room temperature adhesion, the common adhesive is generally a polyurethane adhesive, and the bonding strength of the steel plate substrate and the polyester film has a great difference compared with the two hot film coating methods. The hot lamination technology is a more advanced lamination technology appearing after the lamination technology of the adhesive method, and is divided into a laminating lamination technology and a hot-melt lamination technology according to the difference of the lamination technology; the hot laminating technology is divided into the following steps according to the required equipment in the laminating process: roll lamination and static pressure lamination, because static pressure lamination does not have the continuity advantage of roll lamination, roll lamination technology is used in industrial production at present. FIG. 1 is a schematic diagram of a hot-melt roll lamination technique.
The present embodiment provides a method for inhibiting the movement of metal particles within a GIL comprising the steps of:
s1, before assembling the GIL outer cavity, firstly heating the region of the GIL outer cavity to be coated with the dielectric layer to 230-240 ℃ by adopting a film-coated iron technology, and then coating the dielectric layer with the thickness of 90-110 microns on the GIL by adopting a hot-melting film-coated iron technology, wherein the method specifically comprises the following steps:
s11, cleaning the inner surface of the outer cavity and the film coating roller, performing chromium plating treatment on the region of the inner surface of the outer cavity to be coated with the dielectric layer, and electroplating a layer with the thickness of 50-150 mg/m2After the chromium plating treatment is finished, cleaning the inner surface of the outer cavity again; will be 110 μm thick and 1.05D long2The dielectric layer is wound on the film covering roller, and the distance between the film covering roller and the inner surface of the outer cavity is kept between 30 and 100mm, wherein D2Is the inner diameter of the pipeline of the GIL outer cavity.
S12, heating a region of the outer cavity to be coated with the dielectric layer to 230-240 ℃ (the temperature of the substrate is before 230 ℃, the peeling strength of the coated iron linearly increases along with the temperature increase, and after 240 ℃, the peeling strength of the coated iron is saturated and kept unchanged), adjusting the minimum distance between the axis of the coating roller and the axis of the outer cavity to be 90-110 μm, and enabling a connecting rod between the coating roller and the axis of the outer cavity to be in a vertically downward direction, as shown in figure 2, the front view of the GIL pipeline hot-melt coated iron system is provided.
S13, starting the hot-melt film-coated iron system, starting the rotating device to drive the outer cavity to rotate in the clockwise direction, and when the linear speed of the outer cavity rotating in the clockwise direction reaches v-1.5-5 mm/S, preferably v-3 mm/S (corresponding angular speed (unit: rad/S): omega-0.006/D)2) Laminating is carried out, the rotating speed of the whole laminating process needs to be kept restrained in order to keep the laminating uniformity, laminating is carried out on the inner surface of the outer cavity, and the pressure of a laminating roller on the film needs to be maintained at 1.0-1.4 kg/mm in the whole laminating process2Within the range of (1); the rotating speed and the pressure need to be kept consistent in the whole film coating process for keeping the film coating uniform.
S14, after the PET (Polyethylene Terephthalate) solid medium layer is completely coated on the inner surface of the outer cavity, putting the outer cavity coated with the medium layer into a cooling system for cooling (cooling by cold air or cooling by cooling water);
s2 coating a polyurethane adhesive on the surface of the coated dielectric layer to obtain a treated GIL for inhibiting movement of metal particles within the GIL. The method specifically comprises the following steps:
s21, after cooling, coating a layer of polyurethane adhesive on the PET surface after the PET surface is dried and cleaned, so that an adhesive medium layer clinging to the wall surface is formed on the inner surface of the outer cavity, and then coating a layer of plastic protective film on the coated adhesive medium layer;
s22, assembling the outer cavity, cleaning the inner wall of the tank body with alcohol after the assembling is finished, and performing electrostatic dust removal treatment; and removing the protective film of the viscous medium layer after the electrostatic treatment is finished.
The area of the GIL outer cavity to be coated with the dielectric layer is 200-250 mm in front of and behind the GIL basin-type insulator.
Fig. 3 is a schematic diagram of an effect front view after the outer cavity is coated with the dielectric layer, as shown in fig. 2 and fig. 3, because metal in the pipeline is basically gathered at the bottom of the inner surface of the outer cavity due to the existence of gravity, the purpose of inhibiting the movement of particles can be achieved only by coating the dielectric layer in a section of arc length range of the bottom, and illustratively, the arc-shaped region is selected to be coated at 120-180 degrees at the bottom of the outer cavity, and the longitudinal depth of the arc-shaped region along the pipeline is 200mm in front of and behind the basin-type insulator. Wherein the diameter D of the film-coating roller1According to the inner diameter D of the pipeline of the GIL outer cavity2Selecting, wherein the specific requirements are as follows:
Figure BDA0002304378860000071
illustratively, select D1Is slightly larger than D2And/3.
Fig. 4 is a graph showing the results of vertical lifting field strengths of metal particles on the surfaces of a bare electrode and a ground electrode coated with a non-viscous medium layer and a viscous medium layer when an alternating voltage is applied between flat-plate electrodes in an air environment, and it can be seen from fig. 4 that after the ground electrode is coated with the medium layer, the lifting field strength required by the metal particles is increased, especially the effect of the viscous medium layer is very significant, and the metal particles are not lifted basically in an atmospheric environment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. A method for inhibiting the movement of metal particles within GIL comprising:
1) before assembling the GIL outer cavity, firstly, heating an area to be coated with a dielectric layer on the inner surface of the GIL outer cavity to 230-240 ℃ by adopting a film-coated iron technology, and then coating the dielectric layer with the thickness of 90-110 microns on the GIL by adopting a hot-melting film-coated iron technology;
2) and coating polyurethane adhesive on the surface of the coated dielectric layer to obtain the treated GIL outer cavity for inhibiting the movement of metal particles in the GIL.
2. The method according to claim 1, wherein the step of coating the dielectric layer with the thickness of 90-110 μm by using the hot-melt laminated iron technology comprises the following steps: when the linear speed of the outer cavity rotating in the clockwise direction reaches v ═ 1.5-5 mm/s, film coating is carried out, and the pressure is 1.0-1.4 kg/mm2And the pressure and the rotating speed are kept unchanged in the film covering process.
3. The method as claimed in claim 1, wherein in the step 1), before the assembly of the GIL outer cavity, the region of the inner surface of the outer cavity to be coated with the dielectric layer is subjected to chromium plating treatment to form a layer with a thickness of 50-150 mg/m2A metallic chromium layer of (c).
4. The method according to claim 1, wherein the step 1) of coating the PET medium layer with a thickness of 90-110 μm for GIL by using a hot-melt laminated iron technology comprises the following steps: will be 110 μm thick and 1.05D long2The dielectric layer is wound on the film covering roller, and the distance between the film covering roller and the inner surface of the outer cavity is kept between 30 and 100mm, wherein D2Is the inner diameter of the pipeline of the GIL outer cavity.
5. The method according to claim 1, wherein in the step 1), the outer cavity of the region of the GIL basin insulator to be coated with the dielectric layer is heated to 230-240 ℃ by adopting a film-coated iron technology, and the method comprises the following steps: heating the region of the outer cavity to be coated with the dielectric layer to 230-240 ℃, adjusting the minimum distance between the axis of the film coating roller and the axis of the outer cavity to be 90-110 microns, and fixing the connecting rod between the film coating roller and the axis of the outer cavity in a vertically downward direction.
6. The method of claim 1, wherein the dielectric layer is a PET solid dielectric layer.
7. The method as claimed in claim 1, wherein the region of the inner surface of the GIL outer cavity to be coated with the dielectric layer is 200-250 mm from the front and back of the GIL basin insulator.
CN201911233965.4A 2019-12-05 2019-12-05 Method for inhibiting metal particle movement in GIL Pending CN110923708A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100091679A (en) * 2009-02-11 2010-08-19 엘에스전선 주식회사 Gas insulated transmission line able to keep in the particle traps
CN103640315A (en) * 2013-12-17 2014-03-19 苏州东鸿瑞包装科技有限公司 Multi-functional laminated iron production line
CN105149096A (en) * 2015-08-18 2015-12-16 华北电力大学 Metal particle trap for direct-current gas-insulated power transmission line
CN107552361A (en) * 2017-08-07 2018-01-09 中国电力科学研究院 Gas-insulated transmission line tank body and the method for suppressing its interior particle movement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100091679A (en) * 2009-02-11 2010-08-19 엘에스전선 주식회사 Gas insulated transmission line able to keep in the particle traps
CN103640315A (en) * 2013-12-17 2014-03-19 苏州东鸿瑞包装科技有限公司 Multi-functional laminated iron production line
CN105149096A (en) * 2015-08-18 2015-12-16 华北电力大学 Metal particle trap for direct-current gas-insulated power transmission line
CN107552361A (en) * 2017-08-07 2018-01-09 中国电力科学研究院 Gas-insulated transmission line tank body and the method for suppressing its interior particle movement

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
刘绍峻: "SF6气体绝缘电器中金属屑的控制", 《高压电器》 *
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