Surface arc detection method and system based on thermochromic material

Abstract

The invention relates to a surface arc detection method and system based on a thermochromic material. The surface arc detection method comprises the following steps: preparing an organic insulating material containing thermochromic functional particles; calibrating a color change relationship between the arc energy and the organic insulating material containing the thermochromic functional particles through a test; applying the organic insulating material containing the thermochromic functional particles to the surface of the electrical equipment; establishing a mapping relation library between the electric arc condition of the surface of the electrical equipment and the equipment overhaul and maintenance strategy; acquiring the color change of the organic insulating material containing the thermochromic functional particles on the surface of the electrical equipment through camera equipment, and confirming the arc condition on the surface of the electrical equipment; and confirming an equipment overhaul and maintenance strategy of the current electrical equipment according to the electric arc condition on the surface of the electrical equipment and the mapping relation library.

Description

Technical Field

[0001] The present application relates to the technical field of arc detection, and more specifically, to a surface arc detection method and system based on thermochromic materials. Background Art

[0002] In the prior art, the surface arc detection of electrical equipment mostly relies on devices such as current sensors, infrared thermal imagers, or ultraviolet detectors, and has the following limitations: the cost of sensor layout is high, and it is difficult to comprehensively cover the surface of the equipment; the detection results are easily affected by the environment, and the false alarm rate is high; the position of the arc action and the energy accumulation process cannot be intuitively displayed. In addition, the traditional method lacks a direct correlation mechanism between arc energy and equipment maintenance strategies, and the operation and maintenance decisions rely on manual experience, resulting in a lag in response. Therefore, there is an urgent need to develop a detection method that can visually detect arc energy in real time and is intelligently linked with equipment operation and maintenance strategies.

[0003] The prior art, such as the Chinese patent application with the publication number "CN112067954A", discloses an arc fault test device and a test method. The arc fault test device may include: a wire harness that transmits the electrical energy of a power supply to a load unit, the wire harness includes multiple wires and at least two of the wires have cuts in the insulating layer to expose the conductor portions; an arc fault trigger unit that is used to trigger an arc to occur on the exposed conductor portions of the wire harness when the wire harness is energized; and an arc energy measurement unit that is arranged around the exposed conductor portions of the wire harness to measure the arc energy when an arc occurs on the exposed conductor portions. A method for performing an arc fault test is also disclosed.

[0004] The problems of the above prior art are that this method is for arc simulation and energy measurement in a laboratory environment. Although it has certain advantages in test evaluation, it has obvious defects in real-time monitoring, intelligent maintenance decision-making, cost-effectiveness, and environmental adaptability, and cannot meet the on-line detection requirements of actual operating equipment. Moreover, it lacks a direct linkage with maintenance strategies, resulting in limited practicality and efficiency in engineering applications. Summary of the Invention

[0005] To solve the above technical problems, the present invention proposes a surface arc detection method and system based on thermochromic materials.

[0006] The technical solution of the present invention is as follows:

[0007] The present invention proposes a surface arc detection method based on thermochromic materials, including the following steps:

[0008] Step S1, preparing an organic insulating material containing thermochromic functional particles;

[0009] Step S2, calibrate the relationship between the arc energy and the color change of the organic insulating material containing thermochromic functional particles through experiments;

[0010] Step S3, apply the organic insulating material containing thermochromic functional particles on the surface of the electrical equipment; and establish a mapping relationship library between the arc conditions on the surface of the electrical equipment and the equipment maintenance strategy;

[0011] Step S4, collect the color change of the organic insulating material containing thermochromic functional particles on the surface of the electrical equipment through a camera device to confirm the arc conditions on the surface of the electrical equipment;

[0012] Step S5, confirm the equipment maintenance strategy of the current electrical equipment through the arc conditions on the surface of the electrical equipment and the mapping relationship library.

[0013] As a preferred embodiment, the organic insulating material containing thermochromic functional particles is composed of an organic insulating material matrix, thermochromic functional particles, heat-conducting particles, reinforcing particles, and anti-arc functional particles; among them, the thermochromic functional particles are composed of transition metal-based materials with thermochromic functions; the heat-conducting particles are composed of ceramic-based materials with heat-conducting functions.

[0014] As a preferred embodiment, the calibration of the relationship between the arc energy and the color change of the organic insulating material containing thermochromic functional particles through experiments specifically includes the following steps:

[0015] Use the prepared organic insulating material containing thermochromic functional particles to make test samples;

[0016] According to the usage scenario corresponding to the electrical equipment, confirm the voltage applied to the test samples, record the arc current and the arc passing time, and calculate to confirm the arc energy on the surface of the test samples;

[0017] Obtain the surface image of the test samples experiencing arcs, and confirm the color difference between the arc-experienced part and the non-arc-experienced part of the test samples through CIELAB color space analysis;

[0018] Establish a relationship curve between the color difference and the arc energy by calculating the arc energy on the surface of the test samples and the color difference between the arc-experienced part and the non-arc-experienced part of the test samples;

[0019] When the color difference reaches the maximum value of the organic insulating material containing thermochromic functional particles, confirm the arc energy by replacing the thermochromic functional particles, adjusting the composition of the organic insulating material containing thermochromic functional particles, and the color-changing area of the organic insulating material containing thermochromic functional particles.

[0020] As a preferred embodiment, for the calculation to confirm the arc energy on the surface of the test samples, the arc energy calculation formula is as follows:

[0021] Q = V·I·t;

[0022] Where: Q is the arc energy; V is the applied voltage; I is the arc current; t is the time the arc passes through.

[0023] As a preferred embodiment, the color difference between the arc-experienced part and the non-arc-experienced part of the test sample is confirmed through CIELAB color space analysis, and the color difference calculation formula is as follows:

[0024]

[0025] Where: ΔE is the color difference between the arc-experienced part and the non-arc-experienced part of the test sample; ΔL, ΔC, and ΔH are the lightness difference, chroma difference, and hue difference respectively; S L , S C , S H are the lightness adjustment coefficient, chroma adjustment coefficient, and hue adjustment coefficient respectively; k L , k C and k H are the lightness weighting factor, chroma weighting factor, and hue weighting factor respectively; R T is the hue rotation adjustment factor.

[0026] As a preferred embodiment, when the color difference reaches the maximum value of the organic insulating material containing thermochromic functional particles, the arc energy is confirmed through the area of the color change region of the organic insulating material containing thermochromic functional particles; specifically, it includes the following steps:

[0027] Connect the surface images of the test sample of the arc to confirm the path of the surface arc when the color difference reaches the maximum value ΔE max ; where, ΔE max is obtained through the color difference-arc quantity relationship curve;

[0028] Determine the area of the color change region of the surface arc on the test sample through a preset color difference threshold;

[0029] Establish a corresponding relationship curve according to the area of the color change region on the surface of the test sample and the arc energy of the surface arc of the test sample.

[0030] As a preferred embodiment, the mapping relationship library includes: maintenance strategies for key components of electrical equipment and maintenance strategies for non-key components; among which, the maintenance strategy for non-key components includes: when the detected surface arc energy is between 0-60% of the maximum arc energy that non-key components of the electrical equipment can withstand, and the electrical equipment can operate normally, the corresponding primary maintenance strategy is to shorten the inspection cycle of the electrical equipment; when the detected surface arc energy is between 61-80% of the maximum arc energy that non-key components of the electrical equipment can withstand, and it affects the normal operation of the electrical equipment, the corresponding secondary maintenance strategy is to repair the electrical equipment or replace the damaged non-key components; when the detected surface arc energy is between 81-100% of the maximum arc energy that non-key components of the electrical equipment can withstand, and the electrical equipment cannot operate, the corresponding tertiary maintenance strategy is to replace the damaged non-key components; for key components, if surface arc is detected, electrical equipment overhaul or key component replacement is required.

[0031] On the other hand, the present invention also provides a surface arc detection system based on thermochromic materials, including:

[0032] A thermochromic material preparation module for preparing an organic insulating material containing thermochromic functional particles;

[0033] A calibration module for calibrating the relationship between arc energy and the color change of the organic insulating material containing thermochromic functional particles through experiments;

[0034] A material application and strategy mapping library establishment module for applying the organic insulating material containing thermochromic functional particles on the surface of the electrical equipment; and establishing a mapping relationship library between the arc conditions on the surface of the electrical equipment and the equipment overhaul and maintenance strategies;

[0035] An arc detection module for collecting the color change of the organic insulating material containing thermochromic functional particles on the surface of the electrical equipment through a camera device to confirm the arc conditions on the surface of the electrical equipment;

[0036] A maintenance decision-making module for confirming the current equipment overhaul and maintenance strategy of the electrical equipment based on the arc conditions on the surface of the electrical equipment and the mapping relationship library.

[0037] On yet another aspect, the present invention also provides an electronic device with a computer program stored thereon, and when the computer program is executed by a processor, it implements a surface arc detection method based on thermochromic materials as described in any embodiment of the present invention.

[0038] On yet another aspect, the present invention also provides a computer-readable medium for storing one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement a surface arc detection method based on thermochromic materials as described in any embodiment of the present invention.

[0039] The present invention has the following beneficial effects:

[0040] 1. The thermochromic material can display the position of the arc action and the degree of energy accumulation in real time through color change, and can realize real-time online detection without a complex sensor network, reducing the detection cost;

[0041] 2. A quantitative model is established through CIELAB color difference analysis and arc energy calculation, and the detection range is expanded by combining the discoloration area to realize the whole process monitoring from a trace arc to a critical fault;

[0042] 3. An arc energy - maintenance strategy mapping library is constructed to realize the refined control of zero tolerance for key components and hierarchical maintenance of non-key components, improving the reliability of the equipment;

[0043] 4. Composite heat-conducting particles enhance the heat conduction efficiency, anti-arc particles improve the durability of the material, and reinforcing particles ensure the mechanical strength, making the detection material have both high sensitivity and long life;

[0044] 5. By adjusting the types and ratios of thermochromic particles, the detection requirements of different temperature thresholds can be adapted, and the solution is applicable to multiple scenarios such as substations, power transmission and distribution equipment, etc. Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 It is a schematic flow chart of the method of the present invention;

[0047] Figure 2 It is a surface photo of some samples in Embodiment II and Embodiment III of the present invention after experiencing an arc;

[0048] Figure 3 It is the relationship between the color difference of the test sample in Embodiment II and the number of times of experiencing an arc;

[0049] Figure 4 It is an example of determining the discolored area on the surface of the test sample with a preset color difference threshold after some samples in Embodiment III of the present invention experience an arc;

[0050] Figure 5 It is the relationship between the color difference of the test sample in Embodiment III and the number of times of experiencing an arc;

[0051] Figure 6For the relationship between the discolored area of the test sample and the number of arcs experienced in Example 3, the color difference threshold is set to 30;

[0052] Figure 7 For the relationship between the discolored area of the test sample and the number of arcs experienced in Example 3, the color difference threshold is set to 10;

[0053] Figure 8 For the relationship between the color difference of the test sample and the number of arcs experienced in Example 4. Detailed implementation manners

[0054] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0055] It should be understood that the step numbers used in the text are only for convenient description and do not limit the execution order of the steps.

[0056] It should be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless otherwise clearly specified in the context, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0057] The terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0058] The term " / and / " refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0059] Example 1:

[0060] To make the purpose, technical solutions and advantages of the present invention clearer, the following will combine specific embodiments of the present application and refer to the attached Figure 1 , and clearly and completely describe the technical solutions of the present invention.

[0061] To solve the problems of the prior art, the present invention provides a surface arc detection method based on a thermochromic material, including the following steps:

[0062] Step S1, prepare an organic insulating material containing thermochromic functional particles;

[0063] The organic insulating material containing thermochromic functional particles is composed of an organic insulating material matrix, thermochromic functional particles, heat-conducting particles, reinforcing particles, and anti-arc functional particles; among them, the thermochromic functional particles are composed of a transition metal-based material with thermochromic function; the heat-conducting particles are composed of a ceramic-based material with heat-conducting function.

[0064] The thermochromic functional particles are composed of a transition metal-based material with thermochromic function, and can be selected from 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, molybdenum-containing compounds; and strontium-containing compounds with chemical properties similar to the above transition metal-based elements, preferably cobalt-containing compounds, nickel-containing compounds, copper-containing compounds, vanadium-containing compounds, cadmium-containing compounds, iron-containing compounds, more preferably one or several of cobalt-containing compounds, nickel-containing compounds, copper-containing compounds, vanadium-containing compounds, etc. The size of the thermochromic material particles is 50nm - 10μm, preferably 100nm - 5μm, more preferably 200nm - 3μm. The mass fraction range of the thermochromic material particles can be determined according to the organic insulating material, for example, it is 0.1% - 50%, preferably 1% - 40%, more preferably 5% - 30%.

[0065] The heat-conducting particles are composed of a ceramic-based material with heat-conducting function, and can be one or more of alumina, magnesia, zinc oxide, nickel oxide, silicon oxide, aluminum nitride, silicon nitride, boron nitride, silicon carbide, preferably alumina, silicon oxide, aluminum nitride, silicon nitride, boron nitride, silicon carbide, more preferably alumina, silicon oxide, boron nitride, silicon carbide.

[0066] The organic insulating material matrix can be polysiloxane, including at least one of hydroxyl-terminated polydimethylsiloxane, vinyl-terminated polydimethylsiloxane, and methylvinylpolysiloxane. The viscosity of hydroxyl-terminated polydimethylsiloxane is 500 - 40000 mPa·s, preferably 1000 - 30000 mPa·s, more preferably 3000 - 20000 mPa·s. The viscosity of vinyl-terminated polydimethylsiloxane is 300 - 100000 mPa·s, preferably 800 - 20000 mPa·s, further preferably 1000 - 15000 mPa·s. The molecular weight of methylvinylpolysiloxane is 400000 - 800000, preferably the molecular weight is 500000 - 700000, and the vinyl content is 0.1% - 0.5%, preferably 0.12% - 0.3%.

[0067] The reinforcing particles can be at least one of surface-modified and unmodified precipitated silica, fumed silica, and ultrafine calcium carbonate.

[0068] The arc-resistant functional particles can be at least one of aluminum hydroxide, magnesium hydroxide, double metal hydroxide, silicon oxide, aluminum oxide, boron nitride, layered silicate, ammonium polyphosphate, melamine cyanurate, preferably aluminum hydroxide, double metal hydroxide, ammonium polyphosphate, melamine cyanurate, and more preferably aluminum hydroxide and double metal hydroxide.

[0069] Step S2, calibrate the relationship between the arc energy and the color change of the organic insulating material containing thermochromic functional particles through experiments;

[0070] Step S21, use the prepared organic insulating material containing thermochromic functional particles to make test samples;

[0071] Step S22, according to the usage scenario corresponding to the electrical equipment, confirm the voltage applied to the test samples, record the arc current and the arc passing time, and confirm the arc energy on the surface of the test samples by calculation;

[0072] The arc energy calculation formula is as follows:

[0073] Q = V·I·t;

[0074] In the formula: Q is the arc energy; V is the applied voltage; I is the arc current; t is the arc passing time.

[0075] Step S23, obtain the surface image of the test samples that have experienced the arc, and confirm the color difference between the arc-experienced part and the non-arc-experienced part of the test samples through CIELAB color space analysis;

[0076] The color difference calculation formula is as follows:

[0077]

[0078] Where:

[0079]

[0080] In the formula: ΔE is the color difference between the arc-experienced part and the non-arc-experienced part of the test samples; ΔL, ΔC, and ΔH are the lightness difference, chroma difference, and hue difference respectively; S L 、S C 、S H are the lightness adjustment coefficient, chroma adjustment coefficient, and hue adjustment coefficient respectively; k L 、k C and k H are the lightness weighting factor, hue weighting factor, and hue weighting factor respectively; R T is the hue rotation adjustment factor; is the average lightness value; is the average chroma value; L 1 、L 2are the lightness of the arc-experienced part and the non-arc-experienced part of the test sample; C 1 and C 2 are the chroma of the arc-experienced part and the non-arc-experienced part of the test sample respectively.

[0081] Step S24: Establish a relationship curve between color difference and arc quantity by calculating the arc energy on the surface of the test sample and the color difference between the arc-experienced part and the non-arc-experienced part of the test sample;

[0082] Step S25: After the color difference reaches the maximum value of the organic insulating material containing thermochromic functional particles, confirm the arc energy by replacing the material containing thermochromic functional particles, adjusting the composition of the organic insulating material or through the surface discoloration area; specifically including the following steps:

[0083] Step S251: Connect the points in the surface image of the test sample with the arc where the color difference reaches the maximum value ΔE max to confirm the path of the surface arc; where, ΔE max is obtained through the relationship curve between color difference and arc quantity;

[0084] Step S252: Determine the discoloration area of the surface arc on the surface of the test sample through a preset color difference threshold;

[0085] Step S253: Establish a corresponding relationship curve based on the discoloration area on the surface of the test sample and the arc energy of the surface arc passing through the test sample.

[0086] Step S3: Apply the organic insulating material containing thermochromic functional particles on the surface of the electrical equipment; and establish a mapping relationship library between the arc conditions on the surface of the electrical equipment and the equipment maintenance strategy;

[0087] The mapping relationship library includes: maintenance strategies for key components and non-key components of electrical equipment; among which, the maintenance strategy for non-key components includes: when the detected surface arc energy is between 0-60% of the maximum arc energy that the non-key components of the electrical equipment can withstand, and the electrical equipment can operate normally, the corresponding primary maintenance strategy is to shorten the inspection cycle of the electrical equipment; when the detected surface arc energy is between 61-80% of the maximum arc energy that the non-key components of the electrical equipment can withstand, and it affects the normal operation of the electrical equipment, the corresponding secondary maintenance strategy is to repair the electrical equipment or replace the damaged non-key components; when the detected surface arc energy is between 81-100% of the maximum arc energy that the non-key components of the electrical equipment can withstand, and the electrical equipment cannot operate, the corresponding tertiary maintenance strategy is to replace the damaged non-key components; for key components, if a surface arc is detected, the electrical equipment needs to be overhauled or the key components need to be replaced.

[0088] Step S4: Collect the color change of the organic insulating material containing thermochromic functional particles on the surface of the electrical equipment through a camera device to confirm the arc situation on the surface of the electrical equipment;

[0089] The camera device includes an on-line camera device, a camera device equipped on a regular inspection robot, a camera device equipped on an inspection UAV, etc.

[0090] Step S5: Confirm the equipment maintenance strategy of the current electrical equipment based on the arc situation on the surface of the electrical equipment and the mapping relationship library.

[0091] Embodiment 2:

[0092] This embodiment provides an organic insulating material containing an iron compound Fe 4 [Fe(CN) 6 2 as the thermochromic functional particles, wherein the average particle size of the thermochromic functional particles is 200 nm and the mass fraction is 5%; the organic insulating material matrix is hydroxyl-terminated polydimethylsiloxane with a viscosity of 5000 mPa·s; the reinforcing particles are hydrophobically modified nano-silica; the anti-arc functional particles are aluminum hydroxide. A calibration test is carried out.

[0093] Use the prepared organic insulating material containing thermochromic functional particles to make a sample, and the sample size is 50 mm × 120 mm with a thickness of 6 mm.

[0094] The method for forming the surface arc refers to the methods of sample preparation, preparation of the pollution liquid, and formation of the arc in GB / T 6553, and refers to CN 108919073 A and Chapter 4 of "Preparation and Performance Research of Superhydrophobic Coatings for Anti-Haze Insulators" (Master's Degree Thesis of Southwest Jiaotong University, 2021) to measure the voltage and current of the arc.

[0095] Clean the sample with a suitable solvent (for example, isopropyl alcohol) to remove the residues after treatment. Then wash the sample with distilled water.

[0096] The cleaned specimen should be carefully installed to avoid being contaminated.

[0097] Analytical pure ammonium chloride (NH 4 Cl) with a mass fraction of 1% ± 0.002% and a non-ionic wetting agent of isooctylphenoxy polyethoxy ethanol with a mass fraction of 0.02% ± 0.002% are mixed with distilled water or deionized water.

[0098] Eight layers of filter paper with a thickness of (0.2 ± 0.02) mm are clamped between the upper electrode and the specimen to store the pollution liquid.

[0099] The pollution liquid is added to the filter paper pad so that a uniform liquid flow is formed between the upper and lower electrodes before applying the voltage. ​

[0100] The sample is set at an angle of 45° ± 2° to the horizontal plane. The distance between the two electrodes is (50 ± 0.5) mm.

[0101] If the sample is not self-supporting, an insulating bracket can be used.

[0102] Inject the contaminating liquid into the filter paper liner to fully moisten the filter paper. Adjust the flow rate of the contaminating liquid to 0.3 mL / min. Observe the flow for at least 10 min to ensure that the contaminating liquid flows steadily on the surface of the specimen between the two electrodes.

[0103] When the contaminating liquid is flowing uniformly at the specified flow rate, close the switch, set the voltage to 1.5 kV, observe the surface of the specimen, record the number of arcs, voltage, current, and the time the arc lasts, and calculate the arc energy Q.

[0104] In this embodiment, samples that have experienced 5 arcs, 10 arcs, 15 arcs, and 20 arcs are collected respectively, with 5 samples for each case.

[0105] (3) Take pictures of the surface of the sample.

[0106] (4) Conduct image analysis. Confirm the color difference (average value) between the arc-experienced part and the non-arc-experienced part of the test sample through CIELAB color space analysis. In this embodiment, the average value of the color differences of 5 samples is used as the color difference calculation result. The specific test results are shown in Table 1, Figure 2 and Figure 3 as shown:

[0107] Table 1 Color Difference and Arc Energy Calibration Test Table 1.5 kV

[0108] Number of times of experiencing arc 5 times 10 times 15 times 20 times Color difference between the arc-experienced part and the non-arc-experienced part 8.1 12.1 21.9 29.4 Arc energy 21.8J 43.1J 61.9J 79.2J

[0109] (5) According to the test results, fit the line graph to obtain the curve of the relationship between the arc energy and the color difference as the calibration result.

[0110] Example 3:

[0111] This example provides an organic insulating material containing iron compound Fe 4 [Fe(CN) 6 2 as thermochromic functional particles, where the average particle size of the thermochromic functional particles is 200 nm and the mass fraction is 5%. The applied voltage is 3.5 kV. Other test conditions are similar to those in Example 2. This example is applicable to determining the specific arc energy through the area of the color-changing region after the color difference reaches the maximum value of the organic insulating material containing thermochromic functional particles.

[0112] The test results of the maximum color difference confirmation are shown in Table 2, Figure 2 ,​Figure 4 and Figure 5 as shown in

[0113] Table 2 Color Difference and Arc Energy Calibration Test Table 3.5 kV

[0114] Number of times of experiencing arc 5 times 10 times 15 times 20 times Color difference between the arc-experienced part and the non-arc-experienced part 13.3 33.1 33.2 34.1 Arc energy 45.6J 89.8J 127.1J 167.3J

[0115] After the color difference reaches the maximum value of the organic insulating material containing thermochromic functional particles, by varying the area of the color-changing region of the organic insulating material containing thermochromic functional particles on the surface of the electrical equipment, with the color difference threshold set at 30, a relationship curve is established between the area of the color-changing region on the surface of the test sample and the arc energy of the arc passing through the surface of the test sample. The test results are shown in Table 3 and Figure 6 as shown in

[0116] Table 3 Color Difference Area and Arc Energy Calibration Test Table 3.5 kV

[0117] Number of times of experiencing arc 5 times 10 times 15 times 20 times <![CDATA[Area of the part experiencing the electric arc (mm 2 )]]> 0 32.4 40.1 50.3 Arc energy 45.6J 89.8J 127.1J 167.3J

[0118] Alternatively, the color difference threshold can be set at 10 to establish a relationship curve between the area of the color-changing region on the surface of the test sample and the arc energy of the arc passing through the surface of the test sample. The test results are shown in Table 4 and Figure 7 as shown

[0119] Table 4 Color Difference Area and Arc Energy Calibration Test Table 3.5 kV

[0120]

[0121]

[0122] Example 4:

[0123] This example provides cobalt compound Co 3 (PO 4 ) 2 8H 2 O as thermochromic functional particles and alumina as heat-conducting particles to prepare an organic insulating material containing thermochromic functional particles. Among them, the average particle size of the thermochromic functional particles is 100 nm, and the mass fraction is 10%. The operating voltage is 3.5 kV. Other test conditions are similar to those in Example 2. This example is applicable to determining the specific arc energy by changing the composition of the organic insulating material containing thermochromic functional particles after the color difference reaches the maximum value of the organic insulating material containing thermochromic functional particles. The specific test results are shown in Table 5 and Figure 8 as shown

[0124] Table 5 Color Difference and Arc Energy Calibration Test after Replacing Thermochromic Functional Particles Table 3.5 kV

[0125] Number of times of experiencing arc 5 times 10 times 15 times 20 times Color difference between the arc-experienced part and the non-arc-experienced part 26.8 31.4 37.2 42.9 Arc energy 47.7J 93.4J 136.6J 171.8J

[0126] Example 5:

[0127] This embodiment provides a surface arc detection system based on a thermochromic material, including:

[0128] A thermochromic material preparation module for preparing an organic insulating material containing thermochromic functional particles;

[0129] A calibration module for calibrating the relationship between arc energy and the color change of the organic insulating material containing thermochromic functional particles through experiments;

[0130] A material application and strategy mapping library establishment module for applying the organic insulating material containing thermochromic functional particles on the surface of an electrical device; and establishing a mapping relationship library between the arc conditions on the surface of the electrical device and the equipment maintenance strategy;

[0131] An arc detection module for collecting the color change of the organic insulating material containing thermochromic functional particles on the surface of the electrical device through a camera device to confirm the arc conditions on the surface of the electrical device;

[0132] A maintenance decision module for confirming the equipment maintenance strategy of the current electrical device through the arc conditions on the surface of the electrical device and the mapping relationship library.

[0133] Example 6:

[0134] This embodiment provides an electronic device with a computer program stored thereon, and when the computer program is executed by a processor, it implements a surface arc detection method based on a thermochromic material as described in any embodiment of the present invention.

[0135] Example 7:

[0136] This embodiment provides a computer-readable medium for storing one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement a surface arc detection method based on a thermochromic material as described in any embodiment of the present invention.

[0137] In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the relationship between associated objects and indicates that there can be three relationships. For example, A and / or B can represent the cases where A exists alone, A and B exist simultaneously, and B exists alone. Here, A and B can be singular or plural. The character " / " generally indicates an "or" relationship between the associated objects before and after. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a, b, and c, where a, b, and c can be single or multiple.

[0138] Those of ordinary skill in the art can realize that the units and algorithm steps described in the embodiments disclosed herein can be implemented by a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present application.

[0139] Those skilled in the art can clearly understand that for the sake of convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0140] In several embodiments provided by the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (hereinafter referred to as ROM), random access memories (hereinafter referred to as RAM), magnetic disks, or optical discs that can store program codes.

[0141] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using 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. A surface arc detection method based on thermochromic materials, characterized in that: The following steps are involved: Step S1, preparing an organic insulating material containing thermochromic functional particles; Step S2, calibrating the relationship between arc energy and color change of the organic insulating material containing thermochromic functional particles through experiments; Step S3, applying the organic insulating material containing thermochromic functional particles to the surface of the electrical equipment; and establishing a mapping relationship library between the arc conditions on the surface of the electrical equipment and the equipment inspection and maintenance strategy; Step S4, collecting the color change of the organic insulating material containing thermochromic functional particles on the surface of the electrical equipment by a camera device to confirm the arc condition on the surface of the electrical equipment; Step S5, confirming the equipment inspection and maintenance strategy of the current electrical equipment through the arc condition on the surface of the electrical equipment and the mapping relationship library.

2. A surface arc detection method based on thermochromic materials according to claim 1, characterized in that: The organic insulating material containing thermochromic functional particles is composed of an organic insulating material matrix, thermochromic functional particles, thermal conductive particles, reinforcing particles and arc-resistant functional particles; wherein the thermochromic functional particles are composed of transition metal-based materials with thermochromic function; and the thermal conductive particles are composed of ceramic-based materials with thermal conductive function.

3. The surface arc detection method based on thermochromic materials according to claim 1, characterized in that: The experimental calibration of the relationship between arc energy and color change of the organic insulating material containing thermochromic functional particles specifically comprises the following steps: Using the prepared organic insulating material containing thermochromic functional particles to prepare a test sample; According to the corresponding usage scenario of the electrical equipment, confirm the voltage applied to the test sample, record the arc current and arc elapsed time, and confirm the arc energy on the surface of the test sample by calculation; Obtain the surface image of the test sample that has been subjected to the arc, and confirm the color difference between the part of the test sample that has been subjected to the arc and the part that has not been subjected to the arc through CIELAB color space analysis; The relationship curve between the color difference and the arc energy is established by calculating the arc energy on the surface of the test sample and the color difference between the part of the test sample that has experienced the arc and the part that has not experienced the arc; When the color difference reaches the maximum value of the organic insulating material containing thermochromic functional particles, the arc energy is confirmed by replacing the thermochromic functional particles, adjusting the composition of the organic insulating material containing thermochromic functional particles, and by the area of ​​the color change region of the organic insulating material containing thermochromic functional particles.

4. The surface arc detection method based on thermochromic material according to claim 3, characterized in that: The arc energy on the surface of the test sample is confirmed by calculation, and the arc energy calculation formula is as follows: Q = V·I·t; Where: Q is the arc energy; V is the applied voltage; I is the arc current; t is the time the arc lasts.

5. The surface arc detection method based on thermochromic material according to claim 3, characterized in that: The color difference between the arc-exposed part and the arc-unexposed part of the test sample is confirmed by CIELAB color space analysis, and the color difference calculation formula is as follows: Where: ΔE is the color difference between the part of the test sample that has experienced the arc and the part that has not experienced the arc; ΔL, ΔC and ΔH are the lightness difference, chroma difference and hue difference respectively; S L , S C , S H are the brightness adjustment coefficient, chroma adjustment coefficient and hue adjustment coefficient respectively; k L , k C and k H are the lightness weighting factor, hue weighting factor and tone weighting factor respectively; R T Hue rotation adjustment factor.

6. The surface arc detection method based on thermochromic material according to claim 3, characterized in that: The method of determining the arc energy by the color change area of ​​the organic insulating material containing the thermochromic functional particles after the color difference reaches the maximum value of the organic insulating material containing the thermochromic functional particles comprises the following steps: The maximum color difference ΔE in the surface image of the arc test sample is max Connect the lines to confirm the path of the surface arc; where ΔE max Obtained through the relationship curve between color difference and arc quantity; The color change area of ​​the surface arc on the surface of the test sample is determined by a preset color difference threshold; A corresponding relationship curve is established based on the area of ​​the discolored region on the surface of the test sample and the arc energy of the arc passing through the surface of the test sample.

7. The surface arc detection method based on thermochromic materials according to claim 1, characterized in that: The mapping relationship library includes: maintenance strategies for key components of electrical equipment and maintenance strategies for non-key components; wherein the maintenance strategies for non-key components include: when the detected surface arc energy is between 0-60% of the maximum arc energy that the non-key components of the electrical equipment can withstand, and the electrical equipment can operate normally, the corresponding first-level maintenance strategy is to shorten the inspection cycle of the electrical equipment; when the detected surface arc energy is between 61-80% of the maximum arc energy that the non-key components of the electrical equipment can withstand, and it affects the normal operation of the electrical equipment, the corresponding second-level maintenance strategy is to repair the electrical equipment or replace the damaged non-key components; when the detected surface arc energy is between 81-100% of the maximum arc energy that the non-key components of the electrical equipment can withstand, and the electrical equipment cannot operate, the corresponding third-level maintenance strategy is to replace the damaged non-key components; for key components, if a surface arc is detected, the electrical equipment needs to be inspected or the key components need to be replaced.

8. A surface arc detection system based on thermochromic materials, characterized in that: include: Thermochromic material preparation module, for preparing organic insulating materials containing thermochromic functional particles; A calibration module, which calibrates the relationship between arc energy and color change of organic insulating materials containing thermochromic functional particles through experiments; The material application and strategy mapping library establishment module applies organic insulating materials containing thermochromic functional particles to the surface of electrical equipment; and establishes a mapping relationship library between the arc conditions on the surface of electrical equipment and the equipment inspection and maintenance strategy; The arc detection module uses a camera to collect the color changes of the organic insulating material containing thermochromic functional particles on the surface of the electrical equipment to confirm the arc situation on the surface of the electrical equipment; The maintenance decision module confirms the equipment inspection and maintenance strategy of the current electrical equipment through the arc conditions on the surface of the electrical equipment and the mapping relationship library.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the surface arc detection method based on thermochromic material as described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, a surface arc detection method based on thermochromic materials as described in any one of claims 1 to 7 is implemented.

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