WO2024021374A1

WO2024021374A1 - Method for treating surface of arc extinguishing chamber, and arc extinguishing device

Info

Publication number: WO2024021374A1
Application number: PCT/CN2022/132666
Authority: WO
Inventors: 陈虓; 王韧; 杨文呈; 李佳; 黄继盛; 何治海; 李光明; 张海涛
Original assignee: 云南电网有限责任公司临沧供电局
Priority date: 2022-07-26
Filing date: 2022-11-17
Publication date: 2024-02-01
Also published as: CN115083809A

Abstract

The present application provides a method for treating the surface of an arc extinguishing chamber, and an arc extinguishing device. The method comprises: sleeving an annular shielding net on the outer side of an arc extinguishing chamber, the annular shielding net being equipotentially connected to a shielding cover arranged in the arc extinguishing chamber; cleaning and heating the arc extinguishing chamber sleeved with the annular shielding net, and then coating the surface 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; and injecting epoxy resin into the activated rubber-coated arc extinguishing chamber, curing, and naturally cooling. According to the present application, on one hand, the electric field intensity of the silicone rubber surface on an inner side of the annular shielding net is led to the middle of an epoxy resin material by means of the annular shielding net, and the insulation strength of the arc extinguishing chamber is increased by means of shielding, and on the other hand, plasma activation treatment is carried out on the silicone rubber on the surface of the arc extinguishing chamber, and then epoxy resin casting is carried out, thereby solving the problem of creeping discharge of a 35 kV solid insulated arc extinguishing chamber.

Description

An arc extinguishing chamber surface treatment method and arc extinguishing device

This application claims the priority of a Chinese patent application filed with the China Patent Office on July 26, 2022, with application number 202210886390.1 and the invention title "An arc extinguishing chamber surface treatment method and arc extinguishing device", the entire content of which is incorporated by reference. incorporated in this application.

Technical field

The present application relates to the technical field of electric power equipment, and specifically to an arc extinguishing chamber surface treatment method and an arc extinguishing device.

Background technique

The full name of the solid cabinet is the solid insulated ring network cabinet. It is a ring network cabinet that uses solid insulating materials as the main insulating medium. It integrates the vacuum arc extinguishing chamber and its conductive connections, isolating switches, grounding switches, main busbars, branch busbars, etc. into the main conductive circuit. Single or combined, they are coated and packaged with a solid insulating medium into one or several modules with certain functions that can be recombined or expanded and have fully insulated and fully sealed properties, and then the accessible module surface is coated with conductive or Semi-conductive shielding layer and can be directly and reliably grounded.

As relevant departments have higher and higher requirements for the performance of ring network cabinets, high-reliability solid cabinets have received more and more attention due to their own technical advantages. At present, the technology of 12kV solid cabinet insulation is very mature, but there has been no major progress in 35kV solid cabinet. The main reason is that the 35kV solid insulated ring network cabinet has different performance after power frequency withstand voltage of 95kV/1min and lightning impact ±185kV. degree of damage. After dismantling, it was found that the damage was mainly concentrated around the arc extinguishing chamber. When testing the fracture insulation of the arc extinguishing chamber, irrecoverable insulation damage occurred on the surface of the arc extinguishing chamber.

Existing arc extinguishing chambers are usually equipped with a shielding system. The shielding system includes a shielding cover with a semi-arc surface inside the arc extinguishing chamber. It distributes the electric field evenly, accelerates the recovery speed of the insulation strength of the back-arc gap, and improves the efficiency of the arc extinguishing chamber. breaking capacity, and protects the inner surface insulation of the enclosure. However, the arc extinguishing chamber in the 35kV solid cabinet still has serious surface creepage, causing insulation damage, which needs to be solved urgently.

Contents of the invention

This application provides an arc extinguishing chamber surface treatment method and an arc extinguishing device to solve the serious problem of arc extinguishing chamber surface creepage in existing 35kV solid cabinets.

The first aspect of this application provides a surface treatment method for an arc extinguishing chamber, including:

An annular shielding net is set outside the arc extinguishing chamber, and the annular shielding net is connected to the equipotential connection of the built-in shielding cover of the arc extinguishing chamber;

After cleaning and heating the arc extinguishing chamber introduced into the annular shielding net, the surface is coated with silicone rubber to obtain a rubber-coated arc extinguishing chamber;

Perform 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;

The activated rubber-coated arc extinguishing chamber is injected with epoxy resin, then solidified, and then naturally cooled.

Optionally, the silicone rubber on the surface of the rubber-coated arc extinguishing chamber is activated to obtain an activated rubber-coated arc extinguishing chamber, including:

Let the rubber-coated arc extinguishing chamber stand in an oven at 70°C to 80°C for 1 to 5 hours;

Polish 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, place the rubber-coated arc-extinguishing chamber 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 worktable and rotated in the axial direction, and then a plasma emitter is used for plasma treatment to obtain an activated rubber-coated arc extinguishing chamber.

Optionally, the rotation speed of the rotary workbench is 50 rpm.

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 reciprocates along the axial direction of the arc extinguishing chamber for two times to complete the spraying.

Optionally, the air flow speed at the nozzle of the plasma emitter is 10m/s.

Optionally, the ring-shaped shielding net is made of conductive or semi-conducting material. The ring-shaped 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 ring-shaped shielding net is connected to the arc extinguishing chamber. The central axes of the arc chambers are in the same direction.

Optionally, the distance between the annular shielding net and the silicone rubber surface of the rubber-coated arc extinguishing chamber is greater than or equal to 5 mm.

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

Optionally, the epoxy resin is bisphenol A epoxy resin.

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

It can be seen from the above scheme that in this application, an annular shielding net is set outside the arc extinguishing chamber. The annular shielding net is connected to the shielding cover built in the arc extinguishing chamber at equal potential. After cleaning and heating, the surface is coated with silicone rubber to obtain a coating. Glue the arc extinguishing chamber, and then activate the silicone rubber on the surface of the gumming arc extinguishing chamber to obtain the activated gumming arc extinguishing chamber, inject epoxy resin into the activated gumming arc extinguishing chamber, and then perform Solidify and then cool naturally. On the one hand, this application introduces the electric field intensity of the silicone rubber surface inside the annular shielding net to the middle of the epoxy resin material through the annular shielding net, thereby increasing the insulation strength of the arc extinguishing chamber through shielding. On the other hand, this application uses plasma activation treatment for the silicone rubber on the surface of the arc extinguishing chamber, and then performs epoxy casting to further solve the problem of surface discharge of the 35kV solid insulated arc extinguishing chamber.

Description of drawings

Figure 1 is a schematic flow chart of an arc extinguishing chamber surface treatment method provided by an embodiment of the present application;

Figure 2 is a schematic structural diagram of an annular shielding network provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

Referring to Figure 1, the first aspect of the embodiment of the present application provides a method for surface treatment of an arc extinguishing chamber, including steps S1 to S4.

S1. Set an annular shielding net 20 outside the arc extinguishing chamber 10.

Referring to Figure 1, in the embodiment of the present application, an annular shielding net 20 is first set outside the arc extinguishing chamber 10. The annular shielding net 20 is made of conductive or semi-conductive material. The central axis of the annular shielding net 20 is aligned with the center of the arc extinguishing chamber 10. The axes are in the same direction. The annular shielding net 20 is connected to the shielding cover 11 built into the arc extinguishing chamber 10 at an equal potential.

Optionally, the embodiment of the present application uses welding to fixedly connect the annular shielding net 20 to the built-in shielding cover 11 of the arc extinguishing chamber through one or more metal pillars 21. After the welding is completed, use a multimeter to confirm that the annular shielding net 20 is connected to the arc extinguishing chamber. The arc chamber 10 has a built-in shielding cover 11 for equipotential connection.

Optionally, the width of the annular shielding net 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 net 20 to the metal pillar is 15 mm.

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.

Clean and heat the arc extinguishing chamber introduced into the annular shielding net 20. Use absolute alcohol to clean the surface, and then place it in an oven with a temperature set to 80°C ± 5°C and let it stand for 20 minutes. After standing, a coating process is performed to obtain a coating arc extinguishing chamber. The outside of the coating arc extinguishing chamber is coated with a layer of silicone rubber 30 .

The distance between the annular shielding net 20 in the embodiment of the present application and the surface of the silicone rubber 30 of the rubber-coated arc extinguishing chamber is greater than or equal to 5 mm. Referring to Figure 2, in some preferred embodiments, the distance between the annular shielding net 20 and the silicone rubber surface 30 of the rubber-coated arc extinguishing chamber is equal to 5 mm.

S3. Activate the silicone rubber 30 on the surface of the rubber-coated arc extinguishing chamber to obtain an activated rubber-coated arc extinguishing chamber.

The existing technology for silicone rubber treatment on the arc extinguishing chamber surface is generally limited to coating a coupling agent on its surface. The production method of coating the coupling agent cannot meet the production and manufacturing of 35kV solid insulating parts. Solid insulating parts coated with the coupling agent are used. The surface creepage of the arc extinguishing chamber is very serious, and the insulation effect is usually not achieved. In the embodiment of the present application, the silicone rubber is activated, and then the epoxy resin is poured into production after the activation treatment.

In the embodiment of the present application, after completing the encapsulation process, activation treatment is performed. The steps of activation treatment include:

S301. Leave the rubber-coated arc extinguishing chamber in an oven at 70°C to 80°C for 1 to 5 hours.

S302. Polish the silicone rubber 30 on the surface of the rubber-coated arc extinguishing chamber. Optional, use sand blasting or shot blasting, for example, use 20 mesh steel sand for 15 minutes.

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 the oven at 120°C for 2 hours.

S304. Place the rubber-coated arc extinguishing chamber processed in the above steps on the rotating workbench 40 to rotate in the axial direction, and then use the plasma emitter 50 to perform plasma treatment to obtain an activated rubber-coated arc extinguishing chamber.

Optionally, the rotation speed of the rotary table 40 is 50 rpm.

Optionally, the distance between the plasma nozzle of the plasma emitter 50 and the surface of the silicone rubber 30 of 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. The plasma emitter 50 moves along the axial direction of the arc extinguishing chamber. The spraying is completed in 2 reciprocating motions.

Optionally, the air flow speed at the nozzle of the plasma launcher 50 is 10m/s.

S4. Inject epoxy resin into the activated rubber-coated arc extinguishing chamber, then solidify, and then cool naturally.

After plasma spraying is performed on the arc extinguishing chamber, the epoxy resin injection process is performed. In the embodiment of the present application, the injection of epoxy resin is completed within 4 hours after the silicone rubber 30 of the arc extinguishing chamber is activated, wherein, the epoxy resin The resin is bisphenol A epoxy resin. After the casting is completed, it is cured in an oven at a temperature of 120°C for 24 hours, and then cooled naturally.

In the embodiment of the present application, the electric field intensity on the silicone rubber surface inside the annular shielding net is introduced into the middle of the epoxy resin material through the annular shielding net, thereby increasing the insulation strength of the arc extinguishing chamber through shielding. The silicone rubber on the surface of the arc extinguishing chamber is treated with plasma activation and then epoxy casted to improve the product qualification rate and further solve the problem of extended surface discharge in the 35kV solid insulated arc extinguishing chamber. It can be widely used in high-voltage switch cabinet insulation equipment. production and manufacturing areas.

The second aspect of the embodiment of the present application provides an arc extinguishing device, which is prepared by using the arc extinguishing chamber surface treatment method provided by the first aspect of the embodiment of the present application. In the embodiment of this application, 5 pieces of arc extinguishing device products are processed and produced. The electrical properties of this batch of products are qualified and meet the design requirements.

It can be seen from the above solution that in the embodiment of the present application, an annular shielding net is set outside the arc extinguishing chamber. The annular shielding net is connected to the shielding cover built in the arc extinguishing chamber at equal potentials. After cleaning and heating, the annular shielding net is coated with silicone rubber on the surface. 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. Inject epoxy resin into the activated rubber-coated arc extinguishing chamber, It is then solidified and allowed to cool naturally. In the embodiment of the present application, on the one hand, the electric field intensity on the silicone rubber surface inside the annular shielding net is introduced into the middle of the epoxy resin material through the annular shielding net, thereby increasing the insulation strength of the arc extinguishing chamber through 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 performs epoxy casting to further solve the problem of surface discharge of the 35kV solid insulated arc extinguishing chamber.

Claims

An arc extinguishing chamber surface treatment method, characterized by including:

An annular shielding net is set outside the arc extinguishing chamber, and the annular shielding net is connected to the shielding cover built in the arc extinguishing chamber at equal potential;

After cleaning and heating the arc extinguishing chamber introduced into the annular shielding net, the surface is coated with silicone rubber to obtain a rubber-coated arc extinguishing chamber;

Perform 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;

The activated rubber-coated arc extinguishing chamber is injected with epoxy resin, then solidified, and then naturally cooled.
A method for surface treatment of an arc extinguishing chamber according to claim 1, characterized in that: activating the silicone rubber on the surface of the rubber-coated arc extinguishing chamber to obtain an activated rubber-coated arc extinguishing chamber includes:

Let the rubber-coated arc extinguishing chamber stand in an oven at 70°C to 80°C for 1 to 5 hours;

Polish 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, place the rubber-coated arc-extinguishing chamber 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 worktable and rotated in the axial direction, and then a plasma emitter is used for plasma treatment to obtain an activated rubber-coated arc extinguishing chamber.
The arc extinguishing chamber surface treatment method according to claim 2, characterized in that the rotation speed of the rotating worktable is 50 rpm.
An arc extinguishing chamber surface treatment method according to claim 2, characterized in that the moving speed of the plasma nozzle of the plasma emitter along the arc extinguishing chamber axial direction is 100 mm/min, and the plasma emitter moves along the arc extinguishing chamber. The axial reciprocating motion of the chamber is completed in two spraying operations.
The arc extinguishing chamber surface treatment method according to claim 4, characterized in that the air flow speed at the nozzle of the plasma emitter is 10 m/s.
An arc extinguishing chamber surface treatment method according to claim 1, characterized in that the annular shielding net is made of conductive or semi-conductive material, and the annular shielding net is connected to the arc extinguishing chamber through one or more metal pillars. The built-in shielding cover is fixedly connected, and the central axis of the annular shielding net is in the same direction as the central axis of the arc extinguishing chamber.
The arc extinguishing chamber surface treatment method according to claim 1, characterized in that the distance between the annular shielding net and the silicone rubber surface of the rubber-coated arc extinguishing chamber is greater than or equal to 5 mm.
The arc extinguishing chamber surface treatment method according to claim 1, wherein the curing temperature is 120°C and the curing time is 24 hours.
The arc extinguishing chamber surface treatment method according to claim 1, wherein the epoxy resin is bisphenol A epoxy resin.
An arc extinguishing device prepared using the arc extinguishing chamber surface treatment method according to any one of claims 1 to 9.