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 more particularly to a surface treatment method for an arc extinguishing chamber and an arc extinguishing device. [Background technology]

[0003] The solid cabinet, formally called the solid insulating ring main unit, is a ring main unit that uses solid insulating material as the main insulating medium. The vacuum arc extinguishing chamber and its conductive connections, disconnectors, earthing switches, main busbars, branch busbars and other main conductive circuits are individually or combined and then covered with solid insulating medium to have certain functions, and are packaged into one or more modules that can be combined or expanded again and have full insulation and complete sealing performance. Furthermore, the module surfaces that may be touched by people are coated with a conductive or semi-conductive shielding layer to ensure reliable and direct grounding.

[0004] As related departments place increasingly higher requirements on the performance of ring main units, high-reliability solid-state cabinets are attracting more and more attention due to their own technical advantages. Currently, the insulation technology for 12kV solid-state cabinets has already matured, but there has been no significant progress in 35kV solid-state cabinets. The main reason for this is that 35kV solid-state insulated ring main units have been damaged to varying degrees by both a power-frequency withstand voltage of 95kV / 1min and a lightning impulse of ±185kV. Disassembly reveals that the damage is mainly concentrated around the arc chamber, and testing the insulation of the arc chamber reveals that irreparable insulation damage has occurred on the surface of the arc chamber.

[0005] The arc extinguishing chambers of the prior art are usually equipped with a shielding system, which includes a semicircular curved shield case inside the arc extinguishing chamber 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 housing inner surface. However, the arc extinguishing chambers of 35kV solid cabinets still have the problem of severe creeping discharge, which causes insulation damage, and this problem needs to be solved immediately. Summary of the Invention

[0006] This application provides a surface treatment method for an arc extinguishing chamber and an arc extinguishing device 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 treatment 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: leaving the rubber-coated arc-extinguishing chamber in a dry box at 70°C to 80°C for 1 to 5 hours; 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 left standing in a drying box at 100°C to 150°C for 2 hours; The rubber-coated arc-extinguishing chamber treated in the above steps is placed on a rotary table and rotated in the axial direction, and plasma treatment is performed using a plasma radiator to obtain an activated rubber-coated arc-extinguishing chamber.

[0009] Optionally, the rotation speed of the rotary table 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 semi-conductive 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 more.

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

[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 the arc-extinguishing chamber according to the first aspect of the present application.

[0017] As can be seen from the above technical solution, the present invention involves fitting an annular shielding mesh on the outside of an arc extinguishing chamber, equipotentially connecting it to the chamber's built-in shielding case, cleaning and heating it, then coating its surface with silicone rubber to obtain a rubber-coated arc extinguishing chamber. The silicone rubber on the surface of the rubber-coated arc extinguishing chamber is then activated to obtain the activated rubber-coated arc extinguishing chamber. The activated rubber-coated arc extinguishing chamber is then filled with epoxy resin, solidified, and then naturally cooled. On the one hand, the present invention transfers the electric field strength on the silicone rubber surface inside the annular shielding mesh into the epoxy resin material through the shielding, thereby improving the insulation strength of the arc extinguishing chamber. On the other hand, the present invention also performs plasma activation on the silicone rubber on the surface of the arc extinguishing chamber, followed by epoxy casting, further solving the creeping discharge problem of 35kV solid-insulated arc extinguishing chambers. [Brief explanation 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. [Figure 2] 1 is a schematic diagram of the structure of an annular shield mesh according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[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 it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative work fall within 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 this embodiment, an annular shield mesh 20 is first fitted on the outside of the arc extinguishing chamber 10, and the annular shield mesh 20 is made of a conductive or semi-conductive material, and the central axis of the annular shield mesh 20 is aligned with 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, in the present embodiment, the annular shield mesh 20 is fixedly connected 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 confirm 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 embodiment of the present application along the axial direction 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 shielding mesh 20 installed is washed with anhydrous alcohol, heated, and left to stand for 20 minutes in a drying box set at a temperature of 80°C ± 5°C. After standing, a rubber-coating process is carried out to obtain a rubber-coated arc-extinguishing chamber. The outside of the rubber-coated arc-extinguishing chamber is covered with one layer of silicone rubber 30.

[0027] In the embodiments 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 Figure 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, the silicone rubber 30 on the surface of the rubber-coated arc-extinguishing chamber is subjected to an activation treatment to obtain an activated rubber-coated arc-extinguishing chamber.

[0029] Prior art treatments for silicone rubber on the surface of arc extinguishing chambers are generally limited to coating the surface with a coupling agent, which does not meet the manufacturing requirements for 35kV solid insulating components. Solid insulating components that use a coupling agent suffer from severe creeping discharge on the surface of the arc extinguishing chamber and generally do not achieve the required insulating effect. In the examples of this application, silicone rubber is activated and then cast into an epoxy resin mold after activation.

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

[0031] In step S301, the rubber-coated arc-extinguishing chamber is left standing in a dry 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 left standing in a drying box at 100°C to 150°C for 2 hours. Alternatively, the rubber-coated arc-extinguishing chamber is left standing 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 subjected to plasma treatment 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 allowed to cool naturally.

[0039] After the rubber-coated arc-extinguishing chamber is plasma spray coated, an epoxy resin injection process is carried out. In this embodiment, the epoxy resin is injected within four hours after the silicone rubber 30 of the rubber-coated arc-extinguishing chamber is activated. Bisphenol A epoxy resin is used as the epoxy resin. After the injection is complete, the chamber is placed in a drying box at 120°C for 24 hours to solidify, and then allowed to cool naturally.

[0040] In this embodiment, the electric field strength on the silicone rubber surface inside the annular shielding mesh is guided into the epoxy resin material through the annular shielding mesh, thereby improving the insulation strength of the arc extinguishing chamber. The silicone rubber on the surface of the arc extinguishing chamber is subjected to plasma activation treatment, followed by epoxy casting, which improves the pass rate of the product and further solves the creepage discharge problem of 35kV solid-insulated arc extinguishing chambers, making it suitable for wide use in the production and manufacturing of insulating equipment such as high-voltage switch cabinets.

[0041] A second embodiment of the present application provides an arc extinguishing device manufactured using the surface treatment method for an arc extinguishing chamber according to the first embodiment of the present application. Five arc extinguishing device products are manufactured in this embodiment, 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 present embodiment installs an annular shielding mesh on the outside of the arc extinguishing chamber, equipotentially connecting it to the arc extinguishing chamber's built-in shielding case. After cleaning and heating, the mesh is coated with silicone rubber to obtain a rubber-coated arc extinguishing chamber. The silicone rubber on the surface of the rubber-coated arc extinguishing chamber is then activated to obtain the activated rubber-coated arc extinguishing chamber. The activated rubber-coated arc extinguishing chamber is then filled with epoxy resin, solidified, and then naturally cooled. On the one hand, the present embodiment transfers the electric field strength on the silicone rubber surface inside the annular shielding mesh into the epoxy resin material through the annular shielding mesh, thereby improving the insulation strength of the arc extinguishing chamber. On the other hand, the present embodiment also performs plasma activation on the silicone rubber on the surface of the arc extinguishing chamber, followed by epoxy casting, further resolving the creeping discharge problem of the 35 kV solid-insulated 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 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 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; 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 left standing in a dry box at 100°C to 150°C for 2 hours; 2. The surface treatment method for an arc extinguishing chamber according to claim 1, further comprising the step of placing the rubber-coated arc extinguishing chamber treated by the above steps on a rotary table, rotating the chamber along the 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, wherein 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 along the axial direction of the arc extinguishing chamber twice to complete the spray coating.

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

6. 2. The surface treatment method for an arc extinguishing chamber according to claim 1, characterized in that 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.

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

8. 2. The surface treatment method for an arc-extinguishing chamber according to 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.

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