Method for evaluating electric arc damage degree of outer insulation surface based on thermochromic material

Abstract

The invention relates to a thermochromic material-based method for evaluating the degree of electric arc damage to an external insulation surface, which comprises the following steps of: preparing a silicon rubber composition containing thermochromic functional particles according to a preset raw material ratio to prepare a silicon rubber composition sample, and applying an electric arc to the silicon rubber composition sample, obtaining a sample arc image of the surface of the silicone rubber composition sample; carrying out image segmentation to obtain an electric arc part and a part which is not subjected to electric arc, and calculating a sample color difference value; presetting inspection indexes according to different application areas and application scenes to obtain the electric arc damage degree of the silicone rubber composition sample; fitting a relation curve between the sample color difference and the arc damage degree; and obtaining a surface arc image of the external insulation surface of the to-be-evaluated equipment, calculating a surface color difference value of the surface arc image, and obtaining the arc damage degree of the external insulation surface of the to-be-evaluated equipment according to the relation curve.

Description

Technical Field

[0001] The present application relates to the field of arc damage assessment of external insulation surfaces, and mainly to an arc damage assessment method for external insulation surfaces based on thermochromic materials. Background Art

[0002] Silicone rubber materials have excellent electrical insulation and hydrophobicity, and can effectively prevent pollution flashover accidents. As an effective means of preventing pollution flashover, silicone rubber materials have been widely used in the power industry, especially in the external insulation of electrical equipment. However, after a certain period of operation, under the influence of environmental factors such as continuous fog, rain, snow, and ultraviolet radiation, the external insulation performance of silicone rubber will deteriorate, or in various extreme environments or situations, the surface resistivity of the silicone rubber external insulation will decrease, and the leakage current will increase, resulting in uneven voltage distribution of the insulator string, partial discharge, and arcing. The appearance of arcs will further damage the coating surface and become a major hidden danger to the safe operation of the power grid.

[0003] To address this problem, at present, workers are required to manually inspect and regularly re-spray insulating paint. Such a large amount of external insulation maintenance, upkeep and updating requires a large amount of manpower, material and financial resources.

[0004] For example, a Chinese invention patent with publication number "CN103604755A" discloses a "Silicone Rubber Composite Insulator Shelter Aging Detection Method", which specifically discloses "comprising the following steps: a. capturing an image of the outer surface of the silicone rubber composite insulator shelter and an image of the inner surface after the shelter is cut; b. processing the image to obtain color vectors of the outer and inner surfaces of the shelter, and calculating the color difference between the two according to the color vectors of the outer and inner surfaces of the shelter; c. comparing the color difference calculated in step b with a preset color difference threshold, determining whether the calculated color difference is greater than the preset color difference threshold, if so, determining that the shelter is aged, otherwise determining that the shelter is not aged", but this method relies on calculating the color difference only through the color vectors of the outer and inner surfaces of the shelter to determine the degree of aging, but the aging of silicone rubber is not only reflected in color changes, but also involves changes in physical properties, such as increased hardness, reduced elasticity and surface cracks, etc., and relying solely on color changes to determine aging may result in misjudgment; in addition, this method cannot evaluate the degree of arc damage to silicone rubber after it has been subjected to specific damage such as arc damage, resulting in limitations in the evaluation method. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present application provides a method for evaluating the degree of arc damage on an outer insulation surface based on a thermochromic material.

[0006] The technical solution of this application is as follows:

[0007] On the one hand, the present invention proposes a method for evaluating the degree of arc damage on the outer insulation surface based on a thermochromic material, and the method includes:

[0008] Prepare a silicone rubber composition containing thermochromic functional particles according to a preset raw material ratio, use the silicone rubber composition to make a silicone rubber composition sample, apply a voltage to the silicone rubber composition sample, an arc is generated on the surface of the silicone rubber composition sample, and a sample arc image on the surface of the silicone rubber composition sample is obtained;

[0009] Perform image segmentation on the sample arc image to obtain the arc part and the part that has not experienced the arc in the sample arc image, and calculate the sample color difference between the arc part and the part that has not experienced the arc; preset inspection indicators according to different application regions and application scenarios to obtain the degree of arc damage of the silicone rubber composition sample; fit the relationship curve between the sample color difference and the degree of arc damage;

[0010] Spray or coat the silicone rubber composition on the outer insulation surface of the device to be evaluated, and apply a voltage, an arc is generated on the outer insulation surface of the device to be evaluated, and a surface arc image of the outer insulation surface of the device to be evaluated is obtained; calculate the surface color difference between the arc part and the part that has not experienced the arc in the surface arc image, and according to the relationship curve, obtain the degree of arc damage of the outer insulation surface of the device to be evaluated.

[0011] Preferably, the method further includes preprocessing the sample arc image on the surface of the silicone rubber composition sample, and the preprocessing includes denoising, image enhancement and image size cropping.

[0012] Preferably, when performing image segmentation on the sample arc image to obtain the arc part and the part that has not experienced the arc in the sample arc image, specifically:

[0013] Statistical the brightness values of the pixel points in the sample arc image, and use a preset brightness value threshold to segment the sample arc image, which is expressed by the formula:

[0014]

[0015] In the formula, g(x, y) represents the segmented pixel point, where 1 indicates that the current pixel point belongs to the arc part, and 0 indicates that the current pixel point belongs to the part that has not experienced the arc; Tf(x, y) represents the brightness value of the pixel point f(x, y); T represents the preset brightness value threshold;

[0016] According to the distribution of 1 and 0 on the segmented sample arc image, obtain the arc part and the part that has not experienced the arc in the sample arc image.

[0017] Preferably, a color analysis tool is used to extract the lightness, chroma, and color tone of the arc part and the non-arc part on the surface of the segmented sample arc image, and the sample color difference between the arc part and the non-arc part is calculated, which is expressed by the formula as follows:

[0018] ΔL s =L s1 -L s2 ;

[0019]

[0020] ΔC s =C s1 -C s2 ;

[0021]

[0022] ΔH s =H s1 -H s2 ;

[0023]

[0024]

[0025] In the formula, ΔE represents the sample color difference between the arc part and the non-arc part; L s1 represents the lightness of the arc part; L s2 represents the lightness of the non-arc part; ΔL s represents the lightness difference between the arc part and the non-arc part; represents the average lightness of the arc part and the non-arc part; C s1 represents the chroma of the arc part; C s2 represents the chroma of the non-arc part; ΔC s represents the chroma difference between the arc part and the non-arc part; represents the average chroma of the arc part and the non-arc part; H s1 represents the color tone of the arc part; H s2 represents the color tone of the non-arc part; ΔH s represents the color tone difference between the arc part and the non-arc part; represents the average color tone of the arc part and the non-arc part; R T represents the color tone adjustment function; θ represents the color tone angle; S L represents the lightness scaling factor; S C represents the chroma scaling factor; S H represents the color tone scaling factor; T represents the color tone parameter; k L represents the lightness weight; kC represents the chroma weight; k H represents the hue weight.

[0026] Preferably, according to different application regions and application scenarios, the inspection indexes are preset, and the degree of arc damage of the silicone rubber composition sample is obtained, which is expressed by the formula:

[0027]

[0028] In the formula, D s represents the degree of arc damage of the silicone rubber composition sample; F0 represents the degree of deterioration of the inspection indexes of the sample after experiencing the arc; F1 represents the maximum degree of deterioration of the inspection indexes of the sample under the current application scenario.

[0029] Preferably, the relationship curve between the sample color difference and the degree of arc damage is fitted, which is expressed by the formula:

[0030] y(D s ) = k1ΔE λ + k2;

[0031] In the formula, y(D s ) represents the relationship curve between the sample color difference and the degree of arc damage; k1 represents the preset weight of the degree of arc damage; k2 represents the intercept parameter of the relationship curve; λ represents the adjustment parameter of the relationship curve.

[0032] Preferably, the surface arc image of the external insulation surface of the device to be evaluated is obtained, and the surface color difference between the arc part and the part that has not experienced the arc in the surface arc image is calculated; the color difference of the external insulation surface of the device to be evaluated is input into the relationship curve, and the degree of arc damage of the external insulation surface of the device to be evaluated is output.

[0033] On the other hand, the present invention also proposes an evaluation system for the degree of arc damage of the external insulation surface based on a thermochromic material, and the system includes an image acquisition module, an image segmentation module, an evaluation module for the degree of arc damage, and a result output module, wherein:

[0034] The image acquisition module is used to prepare a silicone rubber composition containing thermochromic functional particles according to a preset raw material ratio, make a silicone rubber composition sample with the silicone rubber composition, apply a voltage to the silicone rubber composition sample, an arc is generated on the surface of the silicone rubber composition sample, and a sample arc image on the surface of the silicone rubber composition sample is obtained; the sample arc image on the surface of the silicone rubber composition sample is transmitted to the image segmentation module;

[0035] The image segmentation module is used to segment the sample arc image, obtain the arc part and the part that has not experienced the arc in the sample arc image, and calculate the sample color difference between the arc part and the part that has not experienced the arc; preset inspection indexes according to different application regions and application scenarios, and obtain the degree of arc damage of the silicone rubber composition sample; fit the relationship curve between the sample color difference and the degree of arc damage;

[0036] The arc damage degree evaluation module is used to spray or coat the silicone rubber composition on the outer insulation surface of the device to be evaluated, apply a voltage, generate an arc on the outer insulation surface of the device to be evaluated, and obtain the surface arc image of the outer insulation surface of the device to be evaluated; calculate the surface color difference between the arc part and the part that has not experienced the arc in the surface arc image, and obtain the degree of arc damage of the outer insulation surface of the device to be evaluated according to the relationship curve;

[0037] The result output module is used to display the degree of arc damage of the outer insulation surface of the device to be evaluated.

[0038] On the other hand, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the method for evaluating the degree of arc damage of the outer insulation surface based on the thermochromic material according to any embodiment of the present invention.

[0039] On the other hand, the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the method for evaluating the degree of arc damage of the outer insulation surface based on the thermochromic material according to any embodiment of the present invention.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] 1) The present invention provides a method for evaluating the degree of arc damage of the outer insulation surface based on the thermochromic material. The silicone rubber composition containing thermochromic functional particles is prepared according to the preset raw material ratio, and the silicone rubber composition sample is made, which improves the standardization degree of the sample, reduces the experimental error caused by sample differences, and improves the reliability of the experimental results;

[0042] 2) The present invention provides a method for evaluating the degree of arc damage on the outer insulation surface based on thermochromic materials. By applying an arc to a silicone rubber composition sample, a sample arc image is obtained, and the image is segmented and color difference calculated to evaluate the degree of arc damage to the silicone rubber, enhancing the evaluation ability of the arc damage situation of silicone rubber under the action of an arc; and the sample arc image is segmented to distinguish the arc and the parts that have not experienced the arc, improving the accuracy of identifying the damaged area on the silicone rubber surface and enhancing the accuracy of subsequent color difference calculation and evaluation of the degree of arc damage;

[0043] 3) The present invention provides a method for evaluating the degree of arc damage on the outer insulation surface based on thermochromic materials, fitting the relationship curve between the sample color difference and the degree of arc damage, improving the accuracy and quantification degree of the evaluation, and enhancing the objectivity and accuracy of the evaluation results. Description of the Drawings

[0044] Figure 1 is the flowchart of the method in the embodiment of the present invention;

[0045] Figure 2 is the sample arc image of the surface of the silicone rubber composition sample in the embodiment of the present invention after different numbers of arcs;

[0046] Figure 3 is the arc part and the part that has not experienced the arc in the sample arc image of the surface of the silicone rubber composition sample in the embodiment of the present invention;

[0047] Figure 4 is the schematic diagram of the part that has experienced the arc and the part that has not experienced the arc in the embodiment of the present invention. Detailed Embodiments

[0048] The following describes the detailed embodiments of the present invention to facilitate those skilled in the art of the present technology to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the detailed embodiments. For those of ordinary skill in the art of the present technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are within the scope of protection.

[0049] The present invention provides the following technical solution: a method for evaluating the degree of arc damage on the outer insulation surface based on thermochromic materials.

[0050] Example 1

[0051] Specifically refer to Figure 1 , this embodiment provides a method for evaluating the degree of arc damage on the outer insulation surface based on thermochromic materials, and the specific steps include:

[0052] S1. Prepare a silicone rubber composition containing thermochromic functional particles according to a preset raw material ratio, and use the silicone rubber composition to make a silicone rubber composition sample;

[0053] S11. The silicone rubber composition containing thermochromic functional particles includes thermochromic material particles, polymer base rubber, reinforcing filler, electric erosion-resistant filler, inorganic filler, silicone oil, silane coupling agent, cross-linking agent and catalyst; among them, the thermochromic material particles are formed after hybridization, compounding and modification based on organic thermochromic materials and inorganic thermochromic materials, and their mass fraction is preferably 0.1%-20%, more preferably 1%-10%;

[0054] S111. The thermochromic material particles are specifically one or more of cobalt-containing compounds, nickel-containing compounds, copper-containing compounds, vanadium-containing compounds, chromium-containing compounds, cadmium-containing compounds, iron-containing compounds, manganese-containing compounds, strontium-containing compounds and molybdenum-containing compounds; preferably cobalt-containing compounds, nickel-containing compounds, copper-containing compounds, vanadium-containing compounds, cadmium-containing compounds, and iron-containing compounds; more preferably one or several of cobalt-containing compounds, nickel-containing compounds, copper-containing compounds and vanadium-containing compounds, etc.;

[0055] S112. The polymer base rubber is specifically polysiloxane, including at least one of hydroxyl-terminated polydimethylsiloxane, vinyl-terminated polydimethylsiloxane and methyl vinyl polysiloxane; the viscosity of the hydroxyl-terminated polydimethylsiloxane is 500-40000 mPa·s, preferably 1000-30000 mPa·s, more preferably 3000-20000 mPa·s; the viscosity of the vinyl-terminated polydimethylsiloxane is 300-100000 mPa·s, preferably 800-20000 mPa·s, more preferably 1000-15000 mPa·s; the molecular weight of the methyl vinyl polysiloxane is 400,000-800,000, preferably the molecular weight is 500,000-700,000, and the vinyl content is 0.1%-0.5%, preferably 0.12%-0.3%;

[0056] S113. The reinforcing filler is specifically at least one of precipitated silica, fumed silica and ultrafine calcium carbonate;

[0057] S114. The electric erosion-resistant filler is specifically at least one of aluminum hydroxide, magnesium hydroxide, double metal hydroxide, silicon oxide, aluminum oxide, boron nitride, layered silicate, ammonium polyphosphate and melamine cyanurate, preferably aluminum hydroxide, double metal hydroxide, ammonium polyphosphate and melamine cyanurate, more preferably aluminum hydroxide and double metal hydroxide;

[0058] S115. The inorganic filler is specifically one or more of pigments, titanium oxide, magnesium oxide, antimony oxide, iron oxide, copper oxide, zinc oxide, silicon carbide, silicon nitride, calcium carbonate, mica, talcum powder, kaolin, glass powder, montmorillonite, wollastonite, barium sulfate, and calcium sulfate; preferably pigments, titanium oxide, antimony oxide, iron oxide, calcium carbonate, mica, kaolin, montmorillonite, and wollastonite; more preferably pigments, titanium oxide, iron oxide, calcium carbonate, mica, and montmorillonite;

[0059] S116. The silicone oil is specifically one or more of methyl silicone oil, ethyl silicone oil, phenyl silicone oil, cyanide-containing silicone oil, methyl hydrogen-containing silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil, methyl ethoxysilicone oil, methyl trifluoropropyl silicone oil, methyl vinyl silicone oil, methyl hydroxy silicone oil, ethyl hydrogen-containing silicone oil, hydroxy hydrogen-containing silicone oil, amino-modified silicone oil, epoxy-modified silicone oil, polyether-modified silicone oil, and carboxyl-modified silicone oil; preferably methyl silicone oil, phenyl silicone oil, methyl hydrogen-containing silicone oil, methyl phenyl silicone oil, methyl vinyl silicone oil, methyl hydroxy silicone oil, ethyl hydrogen-containing silicone oil, hydroxy hydrogen-containing silicone oil, and amino-modified silicone oil; more preferably methyl silicone oil, phenyl silicone oil, methyl phenyl silicone oil, methyl hydroxy silicone oil, and hydroxy hydrogen-containing silicone oil;

[0060] S117. The silane coupling agent is specifically one or more of γ-aminopropyltriethoxysilane, γ-glycidyletheroxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, and hexamethyldisilazane; preferably γ-aminopropyltriethoxysilane, γ-glycidyletheroxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and hexamethyldisilazane; more preferably γ-aminopropyltriethoxysilane, γ-glycidyletheroxypropyltrimethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and hexamethyldisilazane;

[0061] S118. The crosslinking agent is specifically at least one of methyl tributanone oxime silane, vinyl tributanone oxime silane, phenyl tributanone oxime silane, tetrabutanone oxime silane, methyl triacetone oxime silane, and vulcanizing agent bis(2,5-dimethyl-2,5-di(t-butylperoxy)hexane);

[0062] S119. The catalyst is specifically dibutyltin diacetate, delayed platinum complex, stannous octoate, and / or Kast catalyst;

[0063] S12. In the process of preparing the silicone rubber coating, solvent gasoline, trichloropropane, trichloroethane, and composite solvents can be used as the dissolving medium;

[0064] In the process of preparing the silicone rubber coating, other functional fillers can also be added, including stabilizers and flame retardants; the stabilizers include 1-ethynylcyclohexanol, 3,7,11-trimethyldodec-3-yne-3-ol, and tetramethyltetravinylcyclotetrasiloxane, and the flame retardants include hydrotalcite, antimony trioxide, decabromodiphenylethane, platinum-containing flame retardants, and rhodium-containing flame retardants;

[0065] In this embodiment, the preparation process of the silicone rubber composition containing thermochromic functional particles is specifically as follows: 100 kg of hydroxyl-terminated polydimethylsiloxane with a viscosity of 5000 mPa·s, 0.5 kg of hydroxyl silicone oil, and 10 kg of hydrophobically modified nano-silica are placed in a vacuum kneader and kneaded at a temperature below 60 °C and a pressure of -0.1 MPa; after stirring and kneading evenly, 2 kg of iron compound Fe4[Fe(CN)6]2, 90 kg of aluminum hydroxide, and 20 kg of silica are added, fully kneaded evenly, and processed 3 times with a three-roll mill to further disperse evenly until it becomes a colloidal solution in the form of a particle-free viscous liquid;

[0066] The particle-free viscous liquid colloidal solution is added to a planetary disperser, and 200 kg of solvent gasoline, 2 kg of vinyltrimethoxysilane, 2 kg of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 5 kg of methyltributanoneoxime silane, and 0.3 kg of dibutyltin diacetate are added, and dispersed evenly at a stirring speed of 2000 rmp in a cooling environment. After vacuum degassing, the silicone rubber composition containing thermochromic functional particles is obtained;

[0067] The size of the silicone rubber composition sample is 50 mm × 120 mm, and the thickness is 6 mm;

[0068] S2. Apply a voltage to the silicone rubber composition sample, an arc is generated on the surface of the silicone rubber composition sample, and a sample arc image on the surface of the silicone rubber composition sample is obtained;

[0069] The method further includes preprocessing the sample arc image on the surface of the silicone rubber composition sample, and the preprocessing includes denoising, image enhancement, and image size cropping;

[0070] In this embodiment, an arc is formed by using the method of sample preparation and pollution liquid preparation in GB / T 6553. Specifically, the residue of the silicone rubber composition sample is removed by using isopropyl alcohol solvent, and the silicone rubber composition sample after removing the residue is washed with distilled water; the distilled water is composed of analytical pure ammonium chloride NH4Cl with a mass fraction of 1% ± 0.002% and a non-ionic wetting agent of isooctylphenoxypolyethoxyethanol with a mass fraction of 0.02% ± 0.002%;

[0071] The contaminated liquid is stored between an eight-layer filter paper with a thickness of (0.2±0.02) mm and the upper electrode and the silicone rubber composition sample, with the silicone rubber composition sample at an angle of 45°±2° to the horizontal plane, and the distance between the upper and lower electrodes being (50±0.5) mm;

[0072] Inject the contaminated liquid into the filter paper liner, adjust the flow rate of the contaminated liquid to 0.3 mL / min; observe the flow for 10 min. When the contaminated liquid flows down evenly at the specified flow rate, set the voltage to 3.5 kV, observe the surface of the specimen, and record the number of arcs that occur;

[0073] Please refer to Figure 2 , in this embodiment, silicone rubber composition samples that have experienced 5 arcs, 10 arcs, and 15 arcs are recorded;

[0074] S3. Please refer to Figure 3 , perform image segmentation on the sample arc image to obtain the arc part and the part that has not experienced an arc in the sample arc image, count the brightness values of the pixel points in the sample arc image, and use a preset brightness value threshold to segment the sample arc image. Expressed by the formula:

[0075]

[0076] In the formula, g(x,y) represents the segmented pixel point, where 1 indicates that the current pixel point belongs to the arc part, and 0 indicates that the current pixel point belongs to the part that has not experienced an arc; Tf(x,y) represents the brightness value of the pixel point f(x,y); T represents the preset brightness value threshold;

[0077] According to the distribution of 1 and 0 on the segmented sample arc image, obtain the arc part and the part that has not experienced an arc in the sample arc image;

[0078] S4. Please refer to Figure 4 , use a color analysis tool to extract the lightness, chroma, and color tone of the arc part and the part that has not experienced an arc on the surface of the segmented sample arc image, and calculate the sample color difference between the arc part and the part that has not experienced an arc. Expressed by the formula:

[0079] ΔL s =L s1 -L s2 ;

[0080]

[0081] ΔC s =C s1 -C s2 ;

[0082]

[0083] ΔH s = H s1 - H s2 ;

[0084]

[0085] Wherein, ΔE represents the sample color difference between the arc part and the part that has not experienced the arc; L s1 represents the lightness of the arc part; L s2 represents the lightness of the part that has not experienced the arc; ΔL s represents the lightness difference between the arc part and the part that has not experienced the arc; L s represents the average lightness of the arc part and the part that has not experienced the arc; C s1 represents the chroma of the arc part; C s2 represents the chroma of the part that has not experienced the arc; ΔC s represents the chroma difference between the arc part and the part that has not experienced the arc; represents the average chroma of the arc part and the part that has not experienced the arc; H s1 represents the hue degree of the arc part; H s2 represents the hue degree of the part that has not experienced the arc; ΔH s represents the hue degree difference between the arc part and the part that has not experienced the arc; represents the average hue degree of the arc part and the part that has not experienced the arc; R T represents the hue adjustment function; θ represents the hue angle; S L represents the lightness scaling factor; S C represents the chroma scaling factor; S H represents the hue degree scaling factor; T represents the hue degree parameter; k L represents the lightness weight; k C represents the chroma weight; k H represents the hue weight;

[0086] S5. Preset inspection indexes according to different application regions and application scenarios to obtain the degree of arc damage of the silicone rubber composition sample, which is expressed by the formula as:

[0087]

[0088] Wherein, D s represents the degree of arc damage of the silicone rubber composition sample; F0 represents the degree of deterioration of the sample inspection index after experiencing the arc; F1 represents the maximum degree of deterioration of the sample inspection index in the current application scenario;

[0089] Wherein, the inspection index is specifically one or more of the medium static contact angle, organic matter content, scanning electron microscope and energy spectrum;

[0090] S6. Fit the relationship curve between the sample color difference and the degree of arc damage, which is expressed by the formula:

[0091] y(D s ) = k1ΔE λ + k2;

[0092] In the formula, y(D s ) represents the relationship curve between the sample color difference and the degree of arc damage; k1 represents the preset weight of the degree of arc damage; k2 represents the intercept parameter of the relationship curve; λ represents the adjustment parameter of the relationship curve;

[0093] S7. Spray or coat the silicone rubber composition on the outer insulation surface of the device to be evaluated, apply voltage, generate an arc on the outer insulation surface of the device to be evaluated, and obtain the surface arc image of the outer insulation surface of the device to be evaluated; calculate the surface color difference between the arc part and the non-arc part in the surface arc image, and obtain the degree of arc damage of the outer insulation surface of the device to be evaluated according to the relationship curve.

[0094] Example 2

[0095] The silicone rubber composition containing thermochromic functional particles provided in this example is the same as that in Example 1, with a use voltage of 1.5 kV. Observe the surface of the specimen and record the number of arcs that appear; similarly, silicone rubber composition samples that have experienced 5 arcs, 10 arcs, and 15 arcs are recorded;

[0096] In the subsequent steps, they are the same as those in Example 1 and will not be elaborated here.

[0097] Example 3

[0098] The preparation process of the silicone rubber composition containing thermochromic functional particles provided in this example is specifically as follows: Put 50 kg of hydroxyl-terminated polydimethylsiloxane with a viscosity of 1000 mPa·s, 50 kg of vinyl-terminated polydimethylsiloxane with a viscosity of 5000 mPa·s, 2 kg of hexamethyldisilazane, 0.6 kg of γ-glycidyletheroxypropyltrimethoxysilane, 100 kg of aluminum hydroxide, and 10 kg of hydrophobically modified nano-silica into a vacuum kneader and knead at a temperature below 60°C and -0.1 MPa; after stirring and kneading evenly, add 5 kg of Co3(PO4)2﹒8H2O and 20 kg of silica, knead evenly, and process with a three-roll mill 3 times to further disperse evenly until it becomes a colloidal substance in the form of a particle-free viscous liquid;

[0099] Add the particle-free viscous liquid rubber compound into a planetary disperser, add 200 kg of solvent gasoline, 2 kg of hydrogen-containing silicone oil, 0.1 kg of 1-ethynylcyclohexanol and 0.3 kg of Kast catalyst, disperse evenly at a stirring speed of 2000 rmp in a cooling environment, and after vacuum degassing, discharge and fill into cans to obtain a silicone rubber composition containing thermochromic functional particles;

[0100] The subsequent steps are the same as those in Example 1 and will not be elaborated here.

[0101] Example 4

[0102] The preparation process of the silicone rubber composition containing thermochromic functional particles provided in this example is specifically as follows: Add 100 kg of methyl vinyl silicone rubber, 6 kg of hydroxy silicone oil and 0.2 kg of γ-glycidoxypropyltrimethoxysilane, add 20 kg of hydrophobically modified fumed silica and 100 kg of aluminum hydroxide into a vacuum kneader, and knead at below 60 °C and -0.1 MPa; after stirring and kneading evenly, add 7 kg of NH4﹒VO3, knead evenly, and process with a three-roll mill for 3 times to further disperse evenly until it becomes a particle-free viscous liquid colloid;

[0103] Add the particle-free viscous liquid rubber compound into a planetary disperser, add 200 kg of solvent gasoline and 0.1 kg of vulcanizing agent bis(2,5-dimethyl-2,5-di(t-butylperoxy)hexane) in a cooling environment, disperse evenly at a stirring speed of 2000 rmp, and after vacuum degassing, discharge and fill into cans to obtain a silicone rubber composition containing thermochromic functional particles;

[0104] The subsequent steps are the same as those in Example 1 and will not be elaborated here.

[0105] Example 5

[0106] This example provides an evaluation system for the degree of arc damage on the outer insulation surface based on thermochromic materials. The system includes an image acquisition module, an image segmentation module, an arc damage degree evaluation module and a result output module, where:

[0107] The image acquisition module is used to prepare a silicone rubber composition containing thermochromic functional particles according to a preset raw material ratio, make a silicone rubber composition sample using the silicone rubber composition, apply a voltage to the silicone rubber composition sample, generate an arc on the surface of the silicone rubber composition sample, and obtain a sample arc image on the surface of the silicone rubber composition sample; transmit the sample arc image on the surface of the silicone rubber composition sample to the image segmentation module;

[0108] The image segmentation module is used to segment the sample arc image to obtain the arc part and the part that has not experienced the arc in the sample arc image, and calculate the sample color difference between the arc part and the part that has not experienced the arc; preset inspection indexes according to different application regions and application scenarios to obtain the degree of arc damage of the silicone rubber composition sample; fit the relationship curve between the sample color difference and the degree of arc damage;

[0109] The arc damage degree evaluation module is used to spray or coat the silicone rubber composition on the outer insulation surface of the device to be evaluated, apply a voltage, generate an arc on the outer insulation surface of the device to be evaluated, and obtain the surface arc image of the outer insulation surface of the device to be evaluated; calculate the surface color difference between the arc part and the part that has not experienced the arc in the surface arc image, and obtain the degree of arc damage of the outer insulation surface of the device to be evaluated according to the relationship curve;

[0110] The result output module is used to display the degree of arc damage of the outer insulation surface of the device to be evaluated.

[0111] Embodiment 6

[0112] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the method for evaluating the degree of arc damage of the outer insulation surface based on the thermochromic material as described in any embodiment of the present invention.

[0113] Embodiment 7

[0114] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the method for evaluating the degree of arc damage of the outer insulation surface based on the thermochromic material as described in any embodiment of the present invention.

[0115] It should be noted that the system, electronic device, and computer-readable storage medium described in the present invention are all based on the same principle as the method described in Embodiment 1, and will not be elaborated here.

[0116] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An evaluation method for the degree of damage to the outer insulation surface caused by arc based on thermochromic materials, characterized in that, The method includes: Preparing a silicone rubber composition containing thermochromic functional particles according to a preset raw material ratio, fabricating a silicone rubber composition sample using the silicone rubber composition, applying a voltage to the silicone rubber composition sample, generating an arc on the surface of the silicone rubber composition sample, and obtaining a sample arc image of the surface of the silicone rubber composition sample; Performing image segmentation on the sample arc image to obtain the arc part and the non-arced part in the sample arc image, calculating the sample color difference between the arc part and the non-arced part; presetting inspection indexes according to different application regions and application scenarios to obtain the degree of arc damage of the silicone rubber composition sample; fitting a relationship curve between the sample color difference and the degree of arc damage; Spraying or coating the silicone rubber composition on the outer insulation surface of the device to be evaluated, applying a voltage, generating an arc on the outer insulation surface of the device to be evaluated, and obtaining a surface arc image of the outer insulation surface of the device to be evaluated; calculating the surface color difference between the arc part and the non-arced part in the surface arc image, and obtaining the degree of arc damage of the outer insulation surface of the device to be evaluated according to the relationship curve.

2. The method for evaluating the degree of damage to the outer insulation surface caused by arc based on the thermochromic material according to claim 1, characterized in that The method further includes preprocessing the sample arc image on the surface of the silicone rubber composition sample, and the preprocessing includes denoising, image enhancement, and image size cropping.

3. The method for evaluating the degree of arc damage to the outer insulation surface based on the thermochromic material according to claim 1, wherein Performing image segmentation on the sample arc image to obtain the arc part and the non-arced part in the sample arc image, specifically: Statistical brightness values of pixel points in the sample arc image, and segmenting the sample arc image using a preset brightness value threshold, which is expressed by the formula: In the formula, g(x,y) represents the segmented pixel point, where 1 indicates that the current pixel point belongs to the arc part, and 0 indicates that the current pixel point belongs to the non-arced part; Tf(x,y) represents the brightness value of the pixel point f(x,y); T represents the preset brightness value threshold; According to the distribution of 1 and 0 on the segmented sample arc image, the arc part and the non-arced part in the sample arc image are obtained.

4. The method for evaluating the degree of arc damage to the outer insulation surface based on the thermochromic material according to claim 3, characterized in that Using a color analysis tool to extract the lightness, chroma, and color tone of the arc part and the non-arced part on the surface of the segmented sample arc image, and calculating the sample color difference between the arc part and the non-arced part, which is expressed by the formula: ΔL s = L s1 - L s2 ; ΔC s = C s1 - C s2 ; ΔH s = H s1 - H s2 ; Where, ΔE represents the sample color difference between the arc area and the area that has not experienced the arc; L s1 represents the lightness of the arc area; L s2 represents the lightness of the area that has not experienced the arc; ΔL s represents the difference in lightness between the arc area and the area that has not experienced the arc; represents the average value of the lightness between the arc area and the area that has not experienced the arc; C s1 represents the chroma of the arc area; C s2 represents the chroma of the area that has not experienced the arc; ΔC s represents the difference in chroma between the arc area and the area that has not experienced the arc; represents the average value of the chroma between the arc area and the area that has not experienced the arc; H s1 represents the hue degree of the arc area; H s2 represents the hue degree of the area that has not experienced the arc; ΔH s represents the difference in hue degree between the arc area and the area that has not experienced the arc; represents the average value of the hue degree between the arc area and the area that has not experienced the arc; R T represents the hue adjustment function; θ represents the hue angle; S L represents the lightness scaling factor; S C represents the chroma scaling factor; S H represents the hue degree scaling factor; T represents the hue degree parameter; k L represents the lightness weight; k C represents the chroma weight; k H represents the hue weight.

5. The method for evaluating the degree of damage to the outer insulation surface caused by arc based on the thermochromic material according to claim 1, characterized in that, Presetting inspection indexes according to different application regions and application scenarios to obtain the degree of arc damage of the silicone rubber composition sample, which is expressed by the formula: where D s represents the degree of arc damage to the silicone rubber composition sample; F0 represents the degree of deterioration of the sample inspection index after experiencing an arc; F1 represents the maximum degree of deterioration of the sample inspection index in the current application scenario.

6. The method for evaluating the degree of arc damage on the outer insulation surface based on thermochromic materials according to claim 1, wherein Fitting a relationship curve between the sample color difference and the degree of arc damage, which is expressed by the formula: y(D s ) = k1ΔE λ + k2; where y(D s ) represents the relationship curve between the sample color difference and the degree of arc damage; k1 represents the preset weight of the degree of arc damage; k2 represents the intercept parameter of the relationship curve; and λ represents the adjustment parameter of the relationship curve.

7. The method for evaluating the degree of arc damage to the outer insulation surface based on a thermochromic material according to claim 6, wherein Obtaining a surface arc image of the outer insulation surface of the device to be evaluated, calculating the surface color difference between the arc part and the non-arced part in the surface arc image; inputting the color difference of the outer insulation surface of the device to be evaluated into the relationship curve, and outputting the degree of arc damage of the outer insulation surface of the device to be evaluated.

8. An evaluation system for the degree of arc damage on the outer insulation surface based on thermochromic materials, characterized in that The system includes an image acquisition module, an image segmentation module, an arc damage degree evaluation module, and a result output module, where: The image acquisition module is used to prepare a silicone rubber composition containing thermochromic functional particles according to a preset raw material ratio, make a silicone rubber composition sample using the silicone rubber composition, apply a voltage to the silicone rubber composition sample, generate an arc on the surface of the silicone rubber composition sample, and obtain a sample arc image on the surface of the silicone rubber composition sample; transmit the sample arc image on the surface of the silicone rubber composition sample to the image segmentation module; The image segmentation module is used to perform image segmentation on the sample arc image, obtain the arc part and the part that has not experienced the arc in the sample arc image, and calculate the sample color difference between the arc part and the part that has not experienced the arc; preset inspection indexes according to different application regions and application scenarios to obtain the degree of arc damage to the silicone rubber composition sample; fit the relationship curve between the sample color difference and the degree of arc damage; The arc damage degree evaluation module is used to spray or coat the silicone rubber composition on the outer insulation surface of the device to be evaluated, apply a voltage, generate an arc on the outer insulation surface of the device to be evaluated, and obtain a surface arc image of the outer insulation surface of the device to be evaluated; calculate the surface color difference between the arc part and the part that has not experienced the arc in the surface arc image, and obtain the degree of arc damage to the outer insulation surface of the device to be evaluated according to the relationship curve; The result output module is used to display the degree of arc damage to the outer insulation surface of the device to be evaluated.

9. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for evaluating the degree of arc damage to the outer insulation surface based on thermochromic materials as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method for evaluating the degree of arc damage to the outer insulation surface based on thermochromic materials as described in any one of claims 1 to 7.

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