Arc extinguishing chamber surface treatment method and arc extinguishing device

Abstract

The present application provides a surface treatment method and arc extinguishing device for an arc extinguishing chamber, comprising: setting an annular shielding net on the outside of the arc extinguishing chamber, the annular shielding net being connected to the equipotential of the built-in shielding cover of the arc extinguishing chamber, cleaning and heating the annular shielding net, and then coating the surface with silicone rubber to obtain a rubber-coated arc extinguishing chamber, and then activating 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, and then curing it, and then naturally cooling it. On the one hand, the present application uses the annular shielding net to lead the electric field strength of the silicone rubber surface on the inner side of the annular shielding net to the middle of the epoxy resin material, thereby increasing the insulation strength of the arc extinguishing chamber by shielding. On the other hand, the silicone rubber on the surface of the arc extinguishing chamber is subjected to plasma activation treatment, and then epoxy casting is performed, thereby further solving the problem of surface discharge of 35kV solid insulation arc extinguishing chambers.

Description

Technical Field

[0001] The present application relates to the technical field of power equipment, and in particular to an arc extinguishing chamber surface treatment method and an arc extinguishing device. Background Art

[0002] The full name of the solid cabinet is solid insulated ring main unit, which is a ring main unit that uses solid insulating material as the main insulating medium. It uses solid insulating material as the main insulating medium to cover and encapsulate the vacuum interrupter and its conductive connections, disconnectors, grounding switches, main busbars, branch busbars and other main conductive circuits singly or in combination with solid insulating medium to form one or several modules with certain functions, which can be recombined or expanded and have full insulation and full sealing performance. The surface of the module that can be touched by people is coated with a conductive or semi-conductive shielding layer and can be directly and reliably grounded.

[0003] As relevant departments place increasingly stringent performance demands on ring main unit (RMU), high-reliability solid-state RMUs are gaining increasing attention due to their inherent technological advantages. While 12kV solid-state RMU insulation technology is highly mature, significant progress has been made in 35kV RMUs. This is primarily due to the fact that 35kV solid-state RMUs experience varying degrees of damage after undergoing power frequency withstand voltages of 95kV / 1min and lightning surges of ±185kV. Disassembly revealed that the damage was primarily concentrated around the arc extinguishing chamber. During insulation testing of the arc extinguishing chamber's fracture surface, irreversible insulation damage was observed.

[0004] Existing arc extinguishing chambers are typically equipped with a shielding system. This system includes a semi-arc-shaped shielding cover within the arc extinguishing chamber. This shielding system uniformly distributes the electric field, accelerates the recovery of the post-arc gap insulation strength, improves the interrupting capacity of the arc extinguishing chamber, and protects the insulation on the inner surface of the casing. However, the arc extinguishing chamber in 35kV solid-state cabinets still suffers from severe surface creepage, which leads to insulation damage and urgently needs to be addressed. Summary of the Invention

[0005] The present application provides an arc extinguishing chamber surface treatment method and an arc extinguishing device to solve the problem of serious surface creepage of the arc extinguishing chamber in the existing 35kV solid cabinet.

[0006] The first aspect of the present application provides a method for treating an arc extinguishing chamber surface, comprising:

[0007] An annular shielding net is set on the outside of the arc extinguishing chamber, and the annular shielding net is connected to the shielding cover built into the arc extinguishing chamber at the same potential;

[0008] After cleaning and heating the product obtained in the above steps, the surface is coated with silicone rubber to obtain a rubber-coated arc extinguishing chamber;

[0009] Activating the silicone rubber on the surface of the rubber-coated arc-extinguishing chamber to obtain an activated rubber-coated arc-extinguishing chamber;

[0010] The activated encapsulated arc extinguishing chamber is injected with epoxy resin, then cured and naturally cooled.

[0011] Optionally, the step of activating the silicone rubber on the surface of the rubber-coated arc-extinguishing chamber to obtain an activated rubber-coated arc-extinguishing chamber comprises:

[0012] The encapsulated arc extinguishing chamber is placed in an oven at 70°C to 80°C for 1 to 5 hours;

[0013] Grinding the silicone rubber on the surface of the rubber-coated arc extinguishing chamber;

[0014] After cleaning the surface of the rubber-coated arc-extinguishing chamber with alcohol, the rubber-coated arc-extinguishing chamber was placed in an oven at 100°C to 150°C for 2 hours;

[0015] The rubber-coated arc-extinguishing chamber processed in the above steps is placed on a rotating workbench and rotated along the axial direction, and then plasma treated by a plasma emitter to obtain an activated rubber-coated arc-extinguishing chamber.

[0016] Optionally, the rotation speed of the rotary workbench is 50 revolutions per minute.

[0017] Optionally, the moving speed of the plasma nozzle of the plasma emitter along the axial direction of the arc extinguishing chamber is 100 mm / min, and the plasma emitter completes the spraying by reciprocating twice along the axial direction of the arc extinguishing chamber.

[0018] Optionally, the air flow velocity at the plasma emitter nozzle is 10 m / s.

[0019] Optionally, the annular shielding mesh is made of conductive or semi-conductive material, and is fixedly connected to the built-in shielding cover of the arc extinguishing chamber through one or more metal columns, and the central axis of the annular shielding mesh is in the same direction as the central axis of the arc extinguishing chamber.

[0020] Optionally, the distance from the annular shielding mesh to the silicone rubber surface of the rubber-coated arc extinguishing chamber is greater than or equal to 5 mm.

[0021] Optionally, the curing temperature is 120° C. and the curing time is 24 hours.

[0022] Optionally, the epoxy resin is bisphenol A epoxy resin.

[0023] A second aspect of the present application provides an arc extinguishing device, which is prepared using the arc extinguishing chamber surface treatment method provided in the first aspect of the present application.

[0024] As can be seen from the above scheme, the present application sets an annular shielding net on the outside of the arc extinguishing chamber, and the annular shielding net is connected to the built-in shielding cover of the arc extinguishing chamber at the same potential. After cleaning and heating, the surface is coated with silicone rubber to obtain a rubber-coated arc extinguishing chamber, and then the silicone rubber on the surface of the rubber-coated arc extinguishing chamber is activated to obtain an activated rubber-coated arc extinguishing chamber. The activated rubber-coated arc extinguishing chamber is injected with epoxy resin, and then cured and cooled naturally. On the one hand, the present application uses the annular shielding net to lead the electric field strength of the silicone rubber surface on the inner side of the annular shielding net to the middle of the epoxy resin material, and increases the insulation strength of the arc extinguishing chamber by shielding. On the other hand, the present application uses plasma activation treatment on the silicone rubber on the surface of the arc extinguishing chamber, and then performs epoxy casting to further solve the problem of extended surface discharge of the 35kV solid insulation arc extinguishing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic flow chart of a method for treating an arc extinguishing chamber surface provided in an embodiment of the present application;

[0026] Figure 2 Schematic diagram of the ring shielding king structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The present application is further described in detail below with reference to the embodiments.

[0028] Those skilled in the art will understand that the following examples are intended to illustrate the present invention only and should not be construed as limiting the scope of the present invention. Where specific techniques or conditions are not specified in the examples, the techniques or conditions described in the literature in the art or in the product specifications were used. Materials or equipment used without manufacturer identification are conventional products that can be purchased.

[0029] It will be understood by those skilled in the art that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of this application refers to the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" to another element, it can be directly connected to the other piece, or there may be intermediate elements. In addition, the "connection" used here may include wireless connection. The term "and / or" used here includes any unit and all combinations of one or more associated listed items.

[0030] In the description of this application, unless otherwise specified, "plurality" means two or more. Terms such as "inside," "upper," and "lower" indicate positions or states based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific position. Therefore, they should not be construed as limitations on this application.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "provided with" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0032] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as such, will not be interpreted in an idealized or overly formal sense. To facilitate the technical solution of the application, some of the concepts involved in this application will be first explained below.

[0033] See also Figure 1 A first aspect of an embodiment of the present application provides a method for surface treatment of an arc extinguishing chamber, comprising steps S1 to S4.

[0034] S1. An annular shielding net 20 is installed outside the arc extinguishing chamber 10.

[0035] See also Figure 1 In the embodiment of the present application, an annular shielding net 20 is first installed outside the arc extinguishing chamber 10. The annular shielding net 20 is made of conductive or semi-conductive material, and the central axis of the annular shielding net 20 is in the same direction as the central axis of the arc extinguishing chamber 10. The annular shielding net 20 and the shielding cover 11 built into the arc extinguishing chamber 10 are connected to the same potential.

[0036] Optionally, the embodiment of the present application uses welding to fix the annular shielding mesh 20 to the built-in shielding cover 11 of the arc extinguishing chamber through one or more metal columns 21. After welding is completed, a multimeter is used to confirm that the annular shielding mesh 20 and the built-in shielding cover 11 of the arc extinguishing chamber 10 are connected at the same potential.

[0037] Optionally, the annular shielding mesh 20 of the embodiment of the present application has an axial width of 43 mm, and a distance from one side of the annular shielding mesh 20 to the metal column is 15 mm.

[0038] S2. After cleaning and heating the product obtained in the above steps, the surface is coated with silicone rubber 30 to obtain a rubber-coated arc extinguishing chamber.

[0039] The arc extinguishing chamber, which has the annular shielding mesh 20, is cleaned and heated. The surface is cleaned with anhydrous alcohol, and then placed in an oven set at 80°C ± 5°C for 20 minutes. After standing, the arc extinguishing chamber is encapsulated with a rubber layer to obtain a rubber-encapsulated arc extinguishing chamber. The outer side of the rubber-encapsulated arc extinguishing chamber is coated with a layer of silicone rubber 30.

[0040] The distance between the annular shielding mesh 20 and the surface of the silicone rubber 30 of the arc extinguishing chamber is greater than or equal to 5 mm. Figure 2 In some preferred embodiments, the distance between the annular shielding mesh 20 and the silicone rubber surface 30 of the rubber-coated arc extinguishing chamber is equal to 5 mm.

[0041] S3, activating the silicone rubber 30 on the surface of the rubber-coated arc-extinguishing chamber to obtain an activated rubber-coated arc-extinguishing chamber.

[0042] Existing techniques for treating the surface of arc extinguishing chambers with silicone rubber are generally limited to applying a coupling agent. This method of applying a coupling agent is not suitable for the production of 35kV solid insulation components. The surface creepage of arc extinguishing chambers coated with coupling agent is severe, and insulation performance is generally not achieved. In the present embodiment, the silicone rubber is activated, and then epoxy resin casting is performed after activation.

[0043] In the embodiment of the present application, after the encapsulation process is completed, an activation treatment is performed. The activation treatment steps include:

[0044] S301, placing the rubber-coated arc-extinguishing chamber in an oven at 70° C. to 80° C. for 1 to 5 hours.

[0045] S302: Grind the silicone rubber 30 on the surface of the rubber-coated arc-extinguishing chamber. Optionally, sandblasting or shot blasting is performed, for example, using 20-mesh steel sand for 15 minutes.

[0046] S303, after cleaning the surface of the rubber-coated arc-extinguishing chamber with alcohol, place the rubber-coated arc-extinguishing chamber in an oven at 100°C to 150°C for 2 hours. Optionally, place the rubber-coated arc-extinguishing chamber in an oven at 120°C for 2 hours.

[0047] S304, placing the rubber-coated arc-extinguishing chamber processed in the above steps on the rotating workbench 40 and rotating it axially, and then performing plasma treatment using the plasma emitter 50 to obtain an activated rubber-coated arc-extinguishing chamber.

[0048] Optionally, the rotation speed of the rotating workbench 40 is 50 revolutions per minute.

[0049] Optionally, the plasma nozzle of the plasma emitter 50 is 15 mm away from the surface of the arc extinguishing chamber silicone rubber 30, and the moving speed of the plasma nozzle along the axial direction of the arc extinguishing chamber is 100 mm / min. The plasma emitter 50 reciprocates along the axial direction of the arc extinguishing chamber twice to complete the spraying.

[0050] Optionally, the air flow velocity at the nozzle of the plasma emitter 50 is 10 m / s.

[0051] S4. Inject epoxy resin into the activated encapsulated arc extinguishing chamber, solidify it, and then cool it naturally.

[0052] After the rubber-coated arc extinguishing chamber is plasma sprayed, 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. The epoxy resin adopts bisphenol A epoxy resin. After the pouring is completed, it is cured in an oven at a temperature of 120°C for 24 hours and then cooled naturally.

[0053] This embodiment of the present invention uses an annular shielding mesh to direct the electric field strength from the inner surface of the silicone rubber to the center of the epoxy resin material, thereby increasing the insulation strength of the arc extinguishing chamber through shielding. Plasma activation treatment is applied to the silicone rubber on the arc extinguishing chamber surface, followed by epoxy casting, improving product qualification rates and further addressing the issue of extended surface discharge in 35kV solid-insulated arc extinguishing chambers. The invention can be widely used in the production and manufacturing of high-voltage switchgear insulation equipment.

[0054] The second aspect of the present invention provides an arc extinguishing device, which is prepared using the arc extinguishing chamber surface treatment method provided in the first aspect of the present invention. Five arc extinguishing device products were manufactured in the present invention, and the electrical performance of the products was qualified and met the design requirements.

[0055] It can be seen from the above scheme that in the embodiment of the present application, an annular shielding net is set on the outside of the arc extinguishing chamber, and the annular shielding net is connected to the built-in shielding cover of the arc extinguishing chamber at the same potential. After cleaning and heating, the surface is coated with silicone rubber to obtain a rubber-coated arc extinguishing chamber, and then the silicone rubber on the surface of the rubber-coated arc extinguishing chamber is activated to obtain an activated rubber-coated arc extinguishing chamber. Epoxy resin is injected into the activated rubber-coated arc extinguishing chamber, and then cured and naturally cooled. On the one hand, the embodiment of the present application uses the annular shielding net to lead the electric field strength of the silicone rubber surface on the inner side of the annular shielding net to the middle of the epoxy resin material, and increases the insulation strength of the arc extinguishing chamber by shielding. On the other hand, the embodiment of the present application uses plasma activation treatment on the silicone rubber on the surface of the arc extinguishing chamber, and then epoxy casting is performed to further solve the problem of extended surface discharge of the 35kV solid insulation arc extinguishing chamber.

[0056] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and application concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.

Claims

1. A method for treating the surface of an arc extinguishing chamber, characterized in that: include: An annular shielding net is set on the outside of the arc extinguishing chamber, and the annular shielding net is connected to the shielding cover built into the arc extinguishing chamber at the same potential; After cleaning and heating the product obtained in the above steps, the surface is coated with silicone rubber to obtain a rubber-coated arc extinguishing chamber; Activating 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 encapsulated arc extinguishing chamber, curing the same, and then naturally cooling the same; The electric field strength of the silicone rubber surface inside the annular shielding net is led to the middle of the epoxy resin material through the annular shielding net; The method of activating the silicone rubber on the surface of the rubber-coated arc-extinguishing chamber to obtain the activated rubber-coated arc-extinguishing chamber comprises: The encapsulated arc extinguishing chamber is placed in an oven at 70°C to 80°C for 1 to 5 hours; Grinding the silicone rubber on the surface of the rubber-coated arc extinguishing chamber; After cleaning the surface of the rubber-coated arc-extinguishing chamber with alcohol, the rubber-coated arc-extinguishing chamber was placed in an oven at 100° C. to 150° C. for 2 hours; The rubber-coated arc-extinguishing chamber processed in the above steps is placed on a rotating workbench and rotated axially, and then plasma treated by a plasma emitter to obtain an activated rubber-coated arc-extinguishing chamber; The rotation speed of the rotary table is 50 revolutions per minute.

2. The arc extinguishing chamber surface treatment method according to claim 1, characterized in that: The moving speed of the plasma nozzle of the plasma emitter along the axial direction of the arc extinguishing chamber is 100 mm / min, and the plasma emitter is reciprocated along the axial direction of the arc extinguishing chamber twice to complete the spraying.

3. The arc extinguishing chamber surface treatment method according to claim 2, characterized in that: The air flow velocity at the nozzle of the plasma emitter is 10 m / s.

4. The arc extinguishing chamber surface treatment method according to claim 1, characterized in that: The material of the annular shielding net is conductive or semi-conductive material, and the annular shielding net is fixedly connected to the built-in shielding cover of the arc extinguishing chamber through one or more metal columns. The central axis of the annular shielding net is in the same direction as the central axis of the arc extinguishing chamber.

5. The arc extinguishing chamber surface treatment method according to claim 1, characterized in that: The distance from the annular shielding mesh to the silicone rubber surface of the rubber-coated arc extinguishing chamber is greater than or equal to 5 mm.

6. The arc extinguishing chamber surface treatment method according to claim 1, characterized in that: The curing temperature is 120° C. and the curing time is 24 hours.

7. The arc extinguishing chamber surface treatment method according to claim 1, characterized in that: The epoxy resin is bisphenol A epoxy resin.

8. An arc extinguishing device prepared by the arc extinguishing chamber surface treatment method according to any one of claims 1 to 7.

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