Surface treatment method for arc extinguishing chamber and arc extinguishing device

Abstract

The present application provides a surface treatment method for an arc-extinguishing chamber and an arc-extinguishing device, which includes fitting an annular shielding mesh equipotentially connected to the built-in shielding case of the arc-extinguishing chamber on the outside of the arc-extinguishing chamber, cleaning and heating it, and then coating the surface with silicone rubber to obtain a rubber-coated arc-extinguishing chamber, and then performing an activation treatment on the silicone rubber on the surface of the rubber-coated arc-extinguishing chamber to obtain an activated rubber-coated arc-extinguishing chamber, and then injecting epoxy resin into the activated rubber-coated arc-extinguishing chamber, solidifying it, and then cooling it naturally. On the one hand, the present application guides the electric field strength of the silicone rubber surface inside the annular shielding mesh into the epoxy resin material through the annular shielding mesh, and improves the insulation strength of the arc-extinguishing chamber through the shielding, and on the other hand, the silicone rubber on the surface of the arc-extinguishing chamber is subjected to a plasma activation treatment, followed by epoxy casting, to further solve the creeping discharge problem of the 35kV solid insulation arc-extinguishing chamber.

Description

[Technical field]

[0001] This application claims priority to a Chinese patent application filed with the China Intellectual Property Office on July 26, 2022, bearing application number 202210886390.1 and entitled "Surface treatment method for arc-extinguishing chamber and arc-extinguishing device", the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of power systems, and in particular to a surface treatment method for an arc-extinguishing chamber and an arc-extinguishing device. [Background technology]

[0003] The solid cabinet is formally called the solid insulating ring main unit, which is a ring main unit that adopts solid insulating material as the main insulating medium, in which the vacuum arc extinguishing chamber and its conductive connection, the disconnector, the grounding switch, the main busbar, the branch busbar and other main conductive circuits are individually or combined, and then covered with a solid insulating medium to have certain functions, and can be combined or expanded again, packaged into one or more modules with full insulation and complete sealing performance, and further, the module surfaces that may be touched by people are coated with a conductive or semi-conductive shielding layer so as to be reliably and directly grounded.

[0004] As related departments have higher and higher requirements for the performance of ring main unit, the high reliability solid cabinet has attracted more and more attention due to its own technical advantages. At present, the insulation technology of 12kV solid cabinet has already matured, but there has been no significant progress in 35kV solid cabinet, the main reason for this is that the 35kV solid insulation ring main unit has been damaged to different degrees by both power frequency withstand voltage 95kV / 1min and lightning impulse ±185kV. By dismantling, it can be found that the damage is mainly concentrated around the arc chamber, and when the insulation of the arc chamber is tested, irreparable insulation damage has occurred on the surface of the arc chamber.

[0005] The arc-extinguishing chamber of the prior art is usually provided with a shielding system, which includes a semicircular curved shield case inside the arc-extinguishing chamber, so as to uniformly distribute the electric field, accelerate the recovery speed of the insulation strength of the gap after the arc is extinguished, improve the opening and closing ability of the arc-extinguishing chamber, and protect the insulation of the inner surface of the housing. However, the arc-extinguishing chamber in the 35kV solid cabinet still has the problem of severe creeping discharge, which causes insulation damage, and needs to be solved immediately. Summary of the Invention

[0006] The present application provides a surface treatment method and an arc-extinguishing device for an arc-extinguishing chamber in order to solve the problem of severe creeping discharge in the arc-extinguishing chamber of a conventional 35 kV solid cabinet.

[0007] A surface treatment method for an arc extinguishing chamber according to a first aspect of the present application includes: a step of fitting one annular shield mesh equipotentially connected to a built-in shield case of the arc extinguishing chamber on the outside of the arc extinguishing chamber; cleaning and heating the arc extinguishing chamber into which the annular shield mesh has been introduced, and then coating the surface with silicone rubber to obtain a rubber-coated arc extinguishing chamber; performing an activation process on the silicone rubber on the surface of the rubber-coated arc-extinguishing chamber to obtain an activated rubber-coated arc-extinguishing chamber; injecting epoxy resin into the activated rubber-coated arc-extinguishing chamber, allowing it to solidify, and then allowing it to cool naturally.

[0008] Optionally, the step of performing an activation treatment on the silicone rubber on the surface of the rubber-coated arc-extinguishing chamber to obtain an activated rubber-coated arc-extinguishing chamber includes: The rubber-coated arc-extinguishing chamber is allowed to stand in a dry box at 70°C to 80°C for 1 to 5 hours; A step of polishing the silicone rubber on the surface of the covered arc extinguishing chamber; After cleaning the surface of the rubber-coated arc-extinguishing chamber with alcohol, the rubber-coated arc-extinguishing chamber is placed in a drying box at 100°C to 150°C for 2 hours; and placing the rubber-coated arc-extinguishing chamber treated in the above steps on a rotating table and rotating it along the axial direction, and performing plasma treatment with a plasma radiator to obtain an activated rubber-coated arc-extinguishing chamber.

[0009] Optionally, the rotation speed of the turntable is 50 rpm.

[0010] Alternatively, the moving speed of the plasma nozzle of the plasma radiator along the axial direction of the arc-extinguishing chamber is 100 mm / min, and the plasma radiator moves back and forth twice along the axial direction of the arc-extinguishing chamber to complete the spray coating.

[0011] Optionally, the air velocity at the outlet of the plasma emitter is 10 m / s.

[0012] Optionally, the material of the annular shield mesh is a conductive or semiconductive material, the annular shield mesh is fixedly connected to the built-in shield case of the arc extinguishing chamber via one or more metal posts, and the central axis of the annular shield mesh is in the same direction as the central axis of the arc extinguishing chamber.

[0013] Optionally, the distance from the annular shield mesh to the silicone rubber surface of the rubber-coated arc-extinguishing chamber is 5 mm or greater.

[0014] Alternatively, the solidification temperature is 120° C. and the solidification time is 24 h.

[0015] Optionally, the epoxy resin is a bisphenol A type epoxy resin.

[0016] A second aspect of the present application provides an arc-extinguishing device manufactured by the surface treatment method for an arc-extinguishing chamber according to the first aspect of the present application.

[0017] As can be seen from the above technical solution, the present application installs an annular shielding mesh equipotentially connected to the built-in shielding case of the arc extinguishing chamber on the outside of the arc extinguishing chamber, cleans and heats it, and then coats the surface with silicone rubber to obtain a rubber-coated arc extinguishing chamber, and then performs an activation treatment on the silicone rubber on the surface of the rubber-coated arc extinguishing chamber to obtain an activated rubber-coated arc extinguishing chamber, and then injects epoxy resin into the activated rubber-coated arc extinguishing chamber, solidifies, and then cools naturally. On the one hand, the present application guides the electric field strength of the silicone rubber surface inside the annular shielding mesh into the epoxy resin material through the annular shielding mesh, and improves the insulation strength of the arc extinguishing chamber through the shielding. On the other hand, the present application performs a plasma activation treatment on the silicone rubber on the surface of the arc extinguishing chamber, and then performs epoxy casting, thereby further solving the creeping discharge problem of the 35kV solid insulation arc extinguishing chamber. [Brief description of the drawings]

[0018] [Figure 1] 2 is a flowchart of a surface treatment method for an arc extinguishing chamber according to an embodiment of the present application. [Diagram 2] 1 is a schematic diagram of a structure of an annular shield mesh according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative labor belong to the protection scope of the present invention.

[0020] Referring to FIG. 1, a surface treatment method for an arc-extinguishing chamber according to a first aspect of the present invention includes steps S1 to S4.

[0021] In S1, one annular shield mesh 20 is fitted on the outside of the arc extinguishing chamber 10.

[0022] 1, in the embodiment of the present application, first, an annular shield mesh 20 is fitted on the outside of the arc-extinguishing chamber 10, and the annular shield mesh 20 is made of a conductive or semiconductive material, and the central axis of the annular shield mesh 20 is in the same direction as the central axis of the arc-extinguishing chamber 10. The annular shield mesh 20 is equipotentially connected to the built-in shield case 11 of the arc-extinguishing chamber 10.

[0023] Alternatively, the embodiment of the present application fixedly connects the annular shield mesh 20 to the built-in shield case 11 of the arc extinguishing chamber 10 via one or more metal posts 21 by welding, and after the welding is completed, a multimeter is used to check the equipotential connection between the annular shield mesh 20 and the built-in shield case 11 of the arc extinguishing chamber 10.

[0024] Alternatively, the width of the annular shielding mesh 20 in the axial direction of the embodiment of the present application is 43 mm, and the distance from one side of the annular shielding mesh 20 to the metal post is 15 mm.

[0025] In S2, the product obtained in the above step is washed and heated, and then the surface is coated with silicone rubber 30 to obtain a rubber-coated arc-extinguishing chamber.

[0026] The surface of the arc extinguishing chamber with the annular shield mesh 20 installed is washed with anhydrous alcohol, heated, and left to stand for 20 minutes in a drying box with a temperature set to 80°C ± 5°C. After standing, a rubber coating process is performed to obtain a rubber-coated arc extinguishing chamber. The outside of the rubber-coated arc extinguishing chamber is coated with one layer of silicone rubber 30.

[0027] In the embodiment of the present application, the distance from the annular shield mesh 20 to the surface of the silicone rubber 30 of the rubber-coated arc-extinguishing chamber is 5 mm or more. Referring to Fig. 2, in some preferred embodiments, the distance from the annular shield mesh 20 to the surface of the silicone rubber 30 of the rubber-coated arc-extinguishing chamber is 5 mm.

[0028] In S3, an activation process is performed on the silicone rubber 30 on the surface of the rubber-coated arc-extinguishing chamber to obtain an activated rubber-coated arc-extinguishing chamber.

[0029] The prior art treatment of the silicone rubber on the surface of the arc extinguishing chamber is generally limited to coating the surface with a coupling agent, and the manufacturing method using the coating of the coupling agent cannot meet the manufacturing requirements of 35kV solid insulating components, and the solid insulating components using the coating of the coupling agent have severe creeping discharge on the surface of the arc extinguishing chamber, and generally cannot achieve the desired insulating effect. In the embodiment of this application, the silicone rubber is activated, and then epoxy resin is cast after the activation to manufacture the solid insulating components.

[0030] In the embodiment of the present application, after completing the rubber coating process, an activation process is performed, and the activation process steps include the following steps S301 to S304.

[0031] In step S301, the rubber-covered arc-extinguishing chamber is left to stand in a drying box at 70° C. to 80° C. for 1 to 5 hours.

[0032] In step S302, the silicone rubber 30 on the surface of the rubber-coated arc-extinguishing chamber is polished by sandblasting or shot blasting, for example, using 20 mesh steel grit for 15 minutes.

[0033] In step S303, after the surface of the rubber-coated arc-extinguishing chamber is washed with alcohol, the rubber-coated arc-extinguishing chamber is placed in a drying box at 100°C to 150°C for 2 hours. Alternatively, the rubber-coated arc-extinguishing chamber is placed in a drying box at 120°C for 2 hours.

[0034] In step S304, the rubber-coated arc-extinguishing chamber processed in the above steps is placed on the rotary table 40 and rotated along the axial direction, and then plasma treatment is performed by the plasma radiator 50 to obtain an activated rubber-coated arc-extinguishing chamber.

[0035] Optionally, the rotation speed of the turntable 40 is 50 rpm.

[0036] Alternatively, the distance from the plasma nozzle of the plasma emitter 50 to the surface of the silicone rubber 30 in the arc-extinguishing chamber is 15 mm, the moving speed of the plasma nozzle along the axial direction of the arc-extinguishing chamber is 100 mm / min, and the plasma emitter 50 moves back and forth twice along the axial direction of the arc-extinguishing chamber to complete the spray coating.

[0037] Optionally, the air velocity at the outlet of the plasma emitter 50 is 10 m / s.

[0038] In S4, epoxy resin is injected into the activated rubber-coated arc-extinguishing chamber, solidified, and then naturally cooled.

[0039] After the rubber-coated arc-extinguishing chamber is plasma spray coated, the epoxy resin injection process is carried out. In the embodiment of the present application, the epoxy resin injection is completed within 4 hours after the silicone rubber 30 of the rubber-coated arc-extinguishing chamber is activated. Here, the epoxy resin used is bisphenol A type epoxy resin. After the injection is completed, it is solidified in a drying box at a temperature of 120°C for 24 hours and then cooled naturally.

[0040] In the embodiment of the present application, the electric field strength of the silicone rubber surface inside the annular shield mesh is guided into the epoxy resin material through the annular shield mesh, and the insulation strength of the arc extinguishing chamber is improved by the shield. The silicone rubber on the surface of the arc extinguishing chamber is subjected to plasma activation treatment and then epoxy casting, which improves the pass rate of the product, further solves the creepage discharge problem of the 35kV solid insulation arc extinguishing chamber, and can be widely used in the production and manufacturing of insulating equipment such as high voltage switch cabinets.

[0041] The second aspect of the present embodiment provides an arc-extinguishing device manufactured using the surface treatment method for the arc-extinguishing chamber according to the first aspect of the present embodiment. The present embodiment manufactures five arc-extinguishing device products, and the electrical properties of the products in this batch are acceptable and meet the design requirements.

[0042] As can be seen from the above technical solution, the embodiment of the present application is to fit an annular shielding mesh equipotentially connected to the built-in shielding case of the arc extinguishing chamber on the outside of the arc extinguishing chamber, clean and heat it, and then coat the surface with silicone rubber to obtain a rubber-coated arc extinguishing chamber, and then activate the silicone rubber on the surface of the rubber-coated arc extinguishing chamber to obtain an activated rubber-coated arc extinguishing chamber, and then inject epoxy resin into the activated rubber-coated arc extinguishing chamber, solidify, and then naturally cool. On the one hand, the embodiment of the present application guides the electric field strength of the silicone rubber surface inside the annular shielding mesh into the epoxy resin material through the annular shielding mesh, and improves the insulation strength of the arc extinguishing chamber through the shielding. On the other hand, the embodiment of the present application is to perform plasma activation treatment on the silicone rubber on the surface of the arc extinguishing chamber, followed by epoxy casting, to further solve the problem of creeping discharge of the 35kV solid insulation arc extinguishing chamber.

Claims

1. a step of fitting one annular shield mesh equipotentially connected to a built-in shield case of the arc extinguishing chamber on the outside of the arc extinguishing chamber; cleaning and heating the arc extinguishing chamber into which the annular shield mesh has been introduced, and then coating the surface with silicone rubber to obtain a rubber-coated arc extinguishing chamber; performing an activation process on the silicone rubber on the surface of the rubber-coated arc-extinguishing chamber to obtain an activated rubber-coated arc-extinguishing chamber; injecting epoxy resin into the activated rubber-coated arc-extinguishing chamber, allowing it to solidify, and then allowing it to cool naturally.

2. The step of performing an activation treatment on the silicone rubber on the surface of the rubber-coated arc-extinguishing chamber to obtain an activated rubber-coated arc-extinguishing chamber includes: placing the rubber-coated arc-extinguishing chamber in a dry box at 70°C to 80°C for 1 to 5 hours; A step of polishing the silicone rubber on the surface of the covered arc extinguishing chamber; After cleaning the surface of the rubber-coated arc-extinguishing chamber with alcohol, the rubber-coated arc-extinguishing chamber is placed in a drying box at 100° C. to 150° C. for 2 hours; 2. The method for surface treatment of an arc extinguishing chamber according to claim 1, further comprising the steps of: placing the rubber-coated arc extinguishing chamber treated by the above steps on a rotating table, rotating the chamber along an axial direction, and performing plasma treatment using a plasma radiator to obtain an activated rubber-coated arc extinguishing chamber.

3. 3. The surface treatment method for an arc extinguishing chamber according to claim 2, wherein the rotation speed of the rotary table is 50 rpm.

4. 3. The surface treatment method for an arc extinguishing chamber according to claim 2, characterized in that the moving speed of the plasma nozzle of the plasma radiator along the axial direction of the arc extinguishing chamber is 100 mm / min, and the plasma radiator moves back and forth twice along the axial direction of the arc extinguishing chamber to complete the spray coating.

5. 5. The surface treatment method for an arc extinguishing chamber according to claim 4, wherein the air flow velocity at the nozzle of the plasma radiator is 10 m / s.

6. The surface treatment method for an arc extinguishing chamber according to claim 1, characterized in that the material of the annular shielding mesh is a conductive or semiconductive material, the annular shielding mesh is fixedly connected to the built-in shielding case of the arc extinguishing chamber via one or more metal posts, and the central axis of the annular shielding mesh is in the same direction as the central axis of the arc extinguishing chamber.

7. 2. The method for treating the surface of an arc-extinguishing chamber according to claim 1, wherein a distance from said annular shield mesh to a surface of said silicone rubber of said rubber-coated arc-extinguishing chamber is 5 mm or more.

8. 2. The surface treatment method of claim 1, wherein the solidification temperature is 120° C. and the solidification time is 24 hours.

9. 2. The surface treatment method for an arc-extinguishing chamber according to claim 1, wherein the epoxy resin is a bisphenol A type epoxy resin.

10. An arc-extinguishing device manufactured using the surface treatment method for an arc-extinguishing chamber according to any one of claims 1 to 9.

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