Insulator selective jet modification and gradient coating spraying integrated method and system

Abstract

The application discloses an insulator selective jet flow modification and gradient coating spraying integrated method and system, and relates to the field of high-voltage outer insulation material surface treatment technology. The method comprises the following steps: dividing a composite insulator into regions to obtain composite insulators in each sub-region; determining composite insulators in a modified region and composite insulators in an unmodified region from the composite insulators in each sub-region; shielding the composite insulators in the modified region, and pre-treating the surface of the composite insulators in the unmodified region by using atmospheric pressure plasma; spraying a fluorine-containing or silane-containing nano coating on the surface of the pre-treated composite insulator, and performing temperature curing to form a composite hydrophobic layer, so as to obtain modified composite insulators; and measuring performance parameters of the modified composite insulators, and determining the performance of the modified composite insulators according to the measured performance parameters. The application can improve the hydrophobic performance and pollution flashover resistance of the insulating material.

Description

Technical Field

[0001] This application relates to the field of surface treatment technology for high-voltage external insulation materials, and in particular to an integrated method and system for selective jet modification and gradient coating of insulators. Background Technology

[0002] As power system voltage levels continue to increase, the operating environment for outdoor insulation equipment is becoming increasingly complex. Insulators are prone to accumulating contaminants during operation, and flashover accidents can easily occur in humid environments, seriously threatening power grid safety.

[0003] Currently, room temperature vulcanizing (RTV) silicone rubber coatings and physical cleaning are commonly used to improve the performance of insulation materials and prevent flashover accidents in humid environments. However, the improvement effect of this existing technology is not ideal and is not long-lasting. Summary of the Invention

[0004] This application provides an integrated method and system for selective jet modification and gradient coating of insulators, which can form a stable and durable composite functional layer, thereby significantly improving the hydrophobic properties and flashover resistance of insulating materials.

[0005] According to a first aspect of this application, an integrated method for selective jet modification and gradient coating of insulators is provided, the method comprising: The composite insulator is divided into regions to obtain the composite insulators in each sub-region; From the composite insulators of each sub-region, determine the composite insulators of the modified region and the composite insulators of the unmodified region respectively; The composite insulator in the modified region is shielded, and the surface of the composite insulator in the unmodified region is pretreated with atmospheric pressure plasma to obtain a pretreated composite insulator. A fluorine- or silane-containing nano-coating is sprayed onto the surface of the pretreated composite insulator and then cured at temperature to form a composite hydrophobic layer, thereby obtaining the modified composite insulator. The performance parameters of the modified composite insulator are measured, and the performance of the modified composite insulator is determined based on the measured performance parameters.

[0006] Optionally, the process of dividing the composite insulator into regions to obtain composite insulators in each sub-region includes: The composite insulator is divided into multiple sector-shaped regions of equal area; Based on the composite insulators of each sector region, the composite insulators of each sub-region are determined.

[0007] Optionally, the gas that generates the atmospheric pressure plasma includes air and argon.

[0008] Optionally, the thickness of the fluorine-containing or silane-containing nano-coating is 1-5 μm, and the curing temperature of the fluorine-containing or silane-containing nano-coating is 80-120°C.

[0009] Optionally, the performance parameters include the potential decay process and the droplet angle. The performance parameters of the modified composite insulator are measured, and the performance of the modified composite insulator is determined based on the measured performance parameters, including: Potential decay and water droplet angle were measured on the modified composite insulator to obtain the potential decay process and water droplet angle. The performance of the modified composite insulator was verified based on the potential decay process and the water droplet angle.

[0010] According to a second aspect of this application, an integrated system for selective jet modification and gradient coating of insulators is provided, the system comprising: The plasma generating device is used to pre-treat the surface of the unmodified composite insulator using atmospheric pressure plasma to obtain a pre-treated composite insulator. The spraying device is used to spray a fluorine- or silane-containing nano-coating onto the surface of the pretreated composite insulator and perform temperature curing to form a composite hydrophobic layer, thereby obtaining the modified composite insulator. The performance testing device is used to measure the performance parameters of the modified composite insulator and determine the performance of the modified composite insulator based on the measured performance parameters.

[0011] Optionally, the system further includes: an optical emission spectrum monitoring device, which is used to detect the emission wavelength of the atmospheric pressure plasma generated by the plasma generator, and based on the emission wavelength, determine the plasma that modifies the composite insulator in the unmodified region.

[0012] Optionally, the plasma generating device includes: a gas cylinder, a flow meter, a plasma generator, and a microwave source connected in sequence. The plasma generator is used to excite the gas in the gas cylinder to generate plasma based on the microwaves generated by the microwave source. The particles in the generated plasma modify the surface material by impacting the surface of the composite insulator in the unmodified area. The spraying device includes: an electrostatic spray gun.

[0013] Optionally, the frequency of the microwave source is set to 2.45 GHz, and the power of the microwave source is set to 110 W.

[0014] Optionally, the flow meter controls the gas to enter the plasma generator at a volumetric flow rate of 10 L / min.

[0015] This application provides an integrated method and system for selective jet modification and gradient coating of insulators. Compared with existing technologies, this method, through plasma pretreatment and functionalized coating composite modification, can form a structured rough surface, i.e., a stable and durable composite functional layer, which can effectively improve the flashover resistance and hydrophobic properties of composite insulators. This application is applicable to improving the flashover resistance and hydrophobic properties of composite insulators in heavily polluted outdoor areas. Its experimental methods and operations are simple to implement and have strong practicality.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A schematic flowchart of an integrated method for selective jet modification and gradient coating of insulators provided in an embodiment of this application is shown. Figure 2 A physical diagram of the composite insulator provided in the embodiments of this application is shown; Figure 3 A schematic diagram of the sector-shaped region of the composite insulator provided in the embodiments of this application is shown; Figure 4 This paper presents a schematic diagram comparing the composite insulator before and after modification according to an embodiment of this application. Figure 5 This paper shows a schematic diagram of the structure of an integrated system for selective jet modification and gradient coating of insulators provided in an embodiment of this application. Figure 6 A schematic diagram of the structure of the plasma generating device provided in the embodiments of this application is shown. Detailed Implementation

[0018] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0019] Existing technologies are not ideal for modifying composite insulators, and the effects are not lasting.

[0020] To address the aforementioned problems, this invention provides an integrated method for selective jet modification and gradient coating of insulators, such as... Figure 1 As shown, the method includes: Step 10: Divide the composite insulator into regions to obtain composite insulators for each sub-region.

[0021] A physical image of a composite insulator is shown below. Figure 2 As shown, in order to modify the composite insulator and improve its hydrophobicity and flashover resistance, the composite insulator is first wiped with 75% anhydrous alcohol and allowed to air dry for 15 minutes. Then, the composite insulator is divided into regions, as follows: Figure 3 As shown, the composite insulator is divided into multiple sector-shaped regions of equal area, and the composite insulator of each sub-region is determined based on the composite insulator of each sector-shaped region.

[0022] The specific formula for calculating the area of ​​the sector is as follows.

[0023] in, represent Figure 2 The area of ​​any sector within the central sector region ah; An angle representing any sector area; r Represents the radius of the composite insulator.

[0024] Step 20: Determine the composite insulators of the modified region and the composite insulators of the unmodified region from the composite insulators of each sub-region.

[0025] Among them, the composite insulators treated with plasma jet are composite insulators with modified regions, while the composite insulators not treated with plasma jet are composite insulators with unmodified regions.

[0026] In this embodiment of the invention, after dividing the composite insulator into regions, performance tests are performed on the composite insulators in each sector to identify the composite insulators in the modified and unmodified regions. This embodiment of the invention mainly focuses on processing the composite insulators in the unmodified regions.

[0027] Step 30: The composite insulator in the modified region is shielded, and the surface of the composite insulator in the unmodified region is pretreated with atmospheric pressure plasma to obtain the pretreated composite insulator.

[0028] In this embodiment of the invention, when modifying the composite insulator in the unmodified region, the modified region needs to be covered first, and then the surface of the composite insulator in the unmodified region is pretreated with atmospheric pressure plasma to obtain the pretreated composite insulator. The gas used to generate the atmospheric pressure plasma includes air, argon, etc.

[0029] Step 40: Spray a fluorine- or silane-containing nano-coating onto the surface of the pretreated composite insulator and cure it at a temperature to form a composite hydrophobic layer, thereby obtaining the modified composite insulator.

[0030] In an embodiment of the present invention, after plasma pretreatment of the unmodified composite insulator, a fluorine- or silane-containing nano-coating is sprayed onto the surface of the pretreated composite insulator. The thickness of the fluorine- or silane-containing nano-coating is 1-5 μm, and the curing temperature of the fluorine- or silane-containing nano-coating is 80-120°C.

[0031] The embodiments of the present invention, through plasma pretreatment and functionalized coating composite modification, can form a stable and durable composite functional layer, which can effectively improve the flashover resistance and hydrophobic properties of composite insulators. Step 50: Measure the performance parameters of the modified composite insulator and determine the performance of the modified composite insulator based on the measured performance parameters.

[0032] In this embodiment of the invention, after modifying the composite insulator atoms, it is necessary to verify the performance of the modified composite insulator. For this process, step 50 specifically includes: performing potential decay measurement and water droplet angle measurement on the modified composite insulator to obtain the potential decay process and water droplet angle; and verifying the performance of the modified composite insulator based on the potential decay process and the water droplet angle.

[0033] Specifically, the hydrophobicity of the modified composite insulator can be verified by measuring the water droplet angle. Figure 4 As shown, the left image is before modification, and the right image is after modification. The larger the water droplet angle, the easier it is for the surface of the modified composite insulator to be wetted by water, and the poorer its hydrophobicity. Conversely, the smaller the water droplet angle, the less likely the surface of the modified composite insulator is to be wetted by water.

[0034] Furthermore, this embodiment of the invention can also measure the potential decay process of the modified composite insulator. Specifically, a -3kV high-voltage power supply is used to charge the modified composite insulator with a tungsten discharge electrode for 180 seconds. The distance between the electrode and the surface of the modified composite insulator is 5mm. After charging, the modified composite insulator is moved horizontally to a position below the Kelvin probe via a slide rail to test the potential decay process. The distance between the probe and the upper surface of the modified composite insulator is 3mm. The test is stopped after 4 hours. The entire test process is conducted in a sealed glass cavity, maintaining a relative humidity of approximately 35%. If the potential decay process is slow, it indicates that the modified composite insulator has good insulation performance; conversely, if the potential decay process is rapid, it indicates that the modified composite insulator has poor insulation performance.

[0035] This invention provides an integrated method for selective jet modification and gradient coating of insulators. Through plasma pretreatment and functionalized coating composite modification, a structured roughness surface can be formed, resulting in a stable and durable composite functional layer. This effectively improves the flashover resistance and hydrophobic properties of composite insulators. This invention is applicable to improving the flashover resistance and hydrophobic properties of composite insulators in heavily polluted outdoor areas. Its experimental methods and operations are simple to implement and highly practical.

[0036] Furthermore, embodiments of the present invention also provide an integrated system for selective jet modification and gradient coating of insulators, such as... Figure 5 As shown, the device includes: a plasma generating device, a spraying device, and a performance testing device. The plasma generating device is used to pretreat the surface of the unmodified composite insulator using atmospheric pressure plasma to obtain a pretreated composite insulator. The spraying device is used to spray a fluorine- or silane-containing nano-coating onto the surface of the pretreated composite insulator and perform temperature curing to form a composite hydrophobic layer, thereby obtaining a modified composite insulator. The performance testing device is used to measure the performance parameters of the modified composite insulator and determine the performance of the modified composite insulator based on the measured performance parameters.

[0037] In some embodiments, the system further includes: an optical emission spectrum monitoring device, which is used to detect the emission wavelength of the atmospheric pressure plasma generated by the plasma generator, and to determine, based on the emission wavelength, the plasma that modifies the composite insulator in the unmodified region.

[0038] In some embodiments, such as Figure 6As shown, the plasma generating device includes: a gas cylinder, a flow meter, a plasma generator, and a microwave source connected in sequence. The plasma generator is used to excite the gas in the gas cylinder to generate plasma based on the microwaves generated by the microwave source. The particles in the generated plasma modify the surface material by impacting the surface of the composite insulator in the unmodified area.

[0039] The microwave source has a frequency of 2.45 GHz and a power of 110 W.

[0040] Specifically, the gas in the left gas path is the medium for plasma, which can be air or argon. The flow meter controls the gas to enter the plasma generator at a volumetric flow rate of 10 L / min. The microwaves from the microwave source will excite the gas to generate plasma. The plasma will then act on the surface of the composite insulator, that is, allow the particles in the plasma to collide with the surface of the composite insulator, thereby modifying the surface material.

[0041] In some embodiments, the spraying apparatus specifically includes an electrostatic spray gun, which is used to spray a fluorine- or silane-containing nano-coating onto the pretreated surface of the composite insulator.

[0042] This invention provides an integrated system for selective jet modification and gradient coating of insulators. Through plasma pretreatment and functionalized coating composite modification, a structured roughness surface can be formed, resulting in a stable and durable composite functional layer. This effectively improves the flashover resistance and hydrophobic properties of composite insulators. This invention is applicable to improving the flashover resistance and hydrophobic properties of composite insulators in heavily polluted outdoor areas. Its experimental methods and operations are simple and highly practical.

[0043] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application. Those skilled in the art will understand that the modules in the apparatus of the embodiment can be distributed within the apparatus of the embodiment as described, or can be modified to be located in one or more apparatuses different from this embodiment. The modules of the above-described embodiment can be combined into one module, or further divided into multiple sub-modules.

[0044] The serial numbers in this application are for descriptive purposes only and do not represent the superiority or inferiority of any particular implementation scenario. The above disclosures are merely a few specific implementation scenarios of this application; however, this application is not limited thereto, and any variations conceived by those skilled in the art should fall within the protection scope of this application.

Claims

1. A method for integrating selective jet modification and gradient coating spraying of insulators, characterized in that, include: The composite insulator is divided into regions to obtain the composite insulators in each sub-region; From the composite insulators of each sub-region, determine the composite insulators of the modified region and the composite insulators of the unmodified region respectively; The composite insulator in the modified region is shielded, and the surface of the composite insulator in the unmodified region is pretreated with atmospheric pressure plasma to obtain a pretreated composite insulator. A fluorine- or silane-containing nano-coating is sprayed onto the surface of the pretreated composite insulator and then cured at temperature to form a composite hydrophobic layer, thereby obtaining the modified composite insulator. The performance parameters of the modified composite insulator are measured, and the performance of the modified composite insulator is determined based on the measured performance parameters.

2. The method according to claim 1, characterized in that, The process of dividing the composite insulator into regions to obtain composite insulators in each sub-region includes: The composite insulator is divided into multiple sector-shaped regions of equal area; Based on the composite insulators of each sector region, the composite insulators of each sub-region are determined.

3. The method according to claim 1, characterized in that, The gases that generate the atmospheric pressure plasma include air and argon.

4. The method according to claim 1, characterized in that, The thickness of the fluorine- or silane-containing nano-coating is 1-5 μm, and the curing temperature of the fluorine- or silane-containing nano-coating is 80-120°C.

5. The method according to claim 1, characterized in that, The performance parameters include the potential decay process and the droplet angle. The performance parameters of the modified composite insulator are measured, and the performance of the modified composite insulator is determined based on the measured performance parameters, including: Potential decay and water droplet angle were measured on the modified composite insulator to obtain the potential decay process and water droplet angle. The performance of the modified composite insulator was verified based on the potential decay process and the water droplet angle.

6. An integrated system for selective jet modification and gradient coating of insulators, applicable to the method described in any one of claims 1-5, characterized in that, include: Plasma generator, spraying device, and performance testing device. The plasma generating device is used to pre-treat the surface of the unmodified composite insulator using atmospheric pressure plasma to obtain a pre-treated composite insulator. The spraying device is used to spray a fluorine- or silane-containing nano-coating onto the surface of the pretreated composite insulator and perform temperature curing to form a composite hydrophobic layer, thereby obtaining the modified composite insulator. The performance testing device is used to measure the performance parameters of the modified composite insulator and determine the performance of the modified composite insulator based on the measured performance parameters.

7. The system according to claim 6, characterized in that, The system also includes: an optical emission spectrum monitoring device. The optical emission spectrum monitoring device is used to detect the emission wavelength of the atmospheric pressure plasma generated by the plasma generator, and based on the emission wavelength, to determine the plasma that modifies the composite insulator in the unmodified region.

8. The system according to claim 6, characterized in that, The plasma generating device includes: a gas cylinder, a flow meter, a plasma generator, and a microwave source connected in sequence. The plasma generator is used to excite the gas in the gas cylinder to generate plasma based on the microwaves generated by the microwave source. The particles in the generated plasma modify the surface material by impacting the surface of the composite insulator in the unmodified area. The spraying device includes: an electrostatic spray gun.

9. The system according to claim 8, characterized in that, The frequency of the microwave source is set to 2.45 GHz, and the power of the microwave source is set to 110 W.

10. The system according to claim 8, characterized in that, The flow meter controls the gas to enter the plasma generator at a volumetric flow rate of 10 L / min.

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