Integrated coating for cable abnormal discharge monitoring and self-repair and preparation method thereof

Abstract

The present invention discloses an integrated coating for abnormal discharge monitoring and self-repairing of cables. The present invention also discloses a preparation method for the integrated coating for abnormal discharge monitoring and self-repairing of cables, which is implemented according to the following steps: Step 1, preparing microcapsules loaded with a repair agent; Step 2, adding the microcapsules loaded with a repair agent to the outer coating solution to obtain microcapsules loaded with a repair agent coated with a piezoelectric-based material; Step 3, washing the microcapsules loaded with a repair agent coated with a piezoelectric-based material in deionized water to remove the pore-forming agent, and then freeze-drying the microcapsules to obtain microcapsules loaded with a repair agent coated with a porous piezoelectric-based material; Step 4, mixing the porous piezoelectric-based material-coated microcapsules loaded with a repair agent obtained in Step 3 with a coating carrier, a dispersant, a curing agent and a catalyst according to a set ratio to obtain a coating. The integrated coating for abnormal discharge monitoring and self-repairing of cables provided by the present invention and its preparation method can realize real-time monitoring and repair of abnormal discharge conditions of cables, effectively improving the service life of cables.

Description

Technical Field

[0001] The present invention belongs to the technical field of cable monitoring and self-repairing, and specifically relates to an integrated coating for cable abnormal discharge monitoring and self-repairing, and also relates to a preparation method of the integrated coating for cable abnormal discharge monitoring and self-repairing. Background Art

[0002] With the development of modern industry and life, cables are widely used in fields such as power transmission and communications, and are ubiquitous, from urban power grids to industrial equipment and household appliance connections. However, because cables are often buried underground, laid in pipes, or installed in hidden locations such as inside buildings, once a failure occurs, the cost of repair and replacement is high and can have a serious impact on production and life. During the operation of cables, partial discharge (PD) may occur due to aging of insulation materials, manufacturing defects, overvoltage shocks, and other reasons. Although the energy is small, its long-term existence can damage the cable insulation performance and pose a serious safety hazard.

[0003] On June 2, 2020, the applicant, State Grid Corporation of China, filed an invention patent with publication number CN 111426406A, disclosing a cable detection device and method based on temperature-sensitive color change of the cable coating. This method utilizes a solvent-free composite material with corrosion-resistant, hydrophobic, insulating, and color-change indicating properties for the cable coating, which is applied to the insulation layer of cables used in main equipment in distribution networks. The new insulating material displays different colors depending on the temperature of the equipment, enabling visual monitoring of the equipment status. However, this method requires the use of large-scale equipment and cannot provide early warnings and timely repairs to effectively prevent the spread of dangerous situations. On May 31, 2024, the applicant, Wuhan Fenghuo Ruituo Technology Co., Ltd., filed an invention patent with publication number CN118440237A, disclosing a self-healing polymer, its preparation method and application, self-healing coating, cable, and communication equipment. The polymer prepared in this method is an acrylate polymer containing a diketone group, which causes the diketone group to undergo covalent bond rupture at 70-80°C, softening the self-healing polymer and filling the damaged area; after cooling, the covalent bond is restored, and the self-healing polymer hardens, thereby repairing the damaged optical fiber. However, this method requires an external heating device to increase the temperature to trigger the repair, but this not only increases the complexity and cost of the repair, but may also have adverse effects on other equipment or the environment around the cable.

[0004] In summary, although these methods can detect and repair partial discharge to a certain extent, they still cannot achieve real-time monitoring and timely repair, increasing the risk and loss of cable failure. Summary of the Invention

[0005] The first purpose of the present invention is to provide an integrated coating for cable abnormal discharge monitoring and self-repair, so as to realize real-time monitoring and repair of cable abnormal discharge conditions, and effectively improve the service life of the cable.

[0006] The second object of the present invention is to provide a method for preparing an integrated coating for cable abnormal discharge monitoring and self-repair.

[0007] The first technical solution adopted by the present invention is a method for preparing an integrated coating for cable abnormal discharge monitoring and self-repairing, which is specifically implemented according to the following steps:

[0008] Step 1, preparing microcapsules carrying a repairing agent;

[0009] Step 2, preparing an outer coating layer solution, adding the repair agent-loaded microcapsules into the outer coating layer solution to obtain the repair agent-loaded microcapsules coated with the piezoelectric-based material;

[0010] Step 3: washing the piezoelectric-based material-coated repair agent-loaded microcapsules in deionized water at a temperature of 30 to 80° C. for 2 to 8 hours to remove the pore-forming agent, and then freeze-drying to obtain porous piezoelectric-based material-coated repair agent-loaded microcapsules;

[0011] Step 4: The repair agent-loaded microcapsules coated with the porous piezoelectric-based material obtained in step 3 are mixed with the coating carrier, dispersant, curing agent and catalyst in a set ratio to obtain a coating.

[0012] The first technical solution of the present invention is also characterized in that:

[0013] Step 1 is as follows:

[0014] The core material repair agent and the emulsifier are mixed in cyclohexane to form an oil phase, and the shell material monomer is dissolved in deionized water to form an aqueous phase. The interfacial polymerization method is used at a temperature of 40 to 70°C and a stirring speed of 500 to 2000 rpm. After stirring for 1 to 5 hours, the microcapsules loaded with the repair agent are obtained after centrifugal washing and freeze-drying.

[0015] The mass fractions of the core material repair agent, emulsifier and shell material monomer are respectively: 10-60% of the core material repair agent, 1-10% of the emulsifier and 30-89% of the shell material monomer, and the total of the above mass fractions is 100%.

[0016] The core material repair agent is any one of epoxy resin, bisphenol A epoxy resin, silicone rubber or polyurea; the shell material monomer is any one of urea-formaldehyde resin, melamine resin or gelatin-arabic gum; and the emulsifier is Span-80 or Tween-80.

[0017] Step 2 is as follows:

[0018] 1-20% by mass of piezoelectric material and 1-6% by mass of pore-forming agent are dispersed in a mixed solution of N,N-methylenebisacrylamide DMF and acetone in a volume ratio of 5-8:2-5, and heated in a water bath at a temperature of 40-70°C and stirred for 1-5 hours to obtain an outer coating layer solution. The repair-carrying microcapsules obtained in step 1 are added to the outer coating layer solution, and after immersion for 6-24 hours, piezoelectric-based material-coated repair agent-carrying microcapsules are obtained.

[0019] The piezoelectric material is any one of polyvinylidene fluoride (PVDF), polyvinylidene fluoride-trifluoroethylene (PVDF) or polyvinylidene fluoride-hexafluoropropylene (PVPF).

[0020] The pore-forming agent is any one of sodium chloride, polyethylene oxide or sucrose.

[0021] Step 4 is as follows:

[0022] The porous piezoelectric-based material-coated repair agent microcapsules obtained in step 3 are mixed with a coating carrier, a dispersant, a curing agent and a catalyst in a set ratio, and stirred at a high speed of 1000 to 5000 rpm for 10 to 120 minutes to uniformly disperse the components to obtain a coating.

[0023] The mass fraction of the repair agent-carrying microcapsules coated with the porous piezoelectric-based material is 10-50%, the mass fraction of the coating carrier material is 30-75%, the mass fraction of the dispersant is 1-5%, the mass fraction of the curing agent is 5-30% and the mass fraction of the catalyst is 0.1-2%, and the total mass fraction of the above components is 100%.

[0024] The coating carrier material is any one of epoxy resin, polyurethane or acrylic resin; the dispersant is any one of sodium lauryl sulfate, sodium polyacrylate or sodium polycarboxylate; the curing agent is any one of ethylenediamine, diethylenetriamine or phthalic anhydride; and the catalyst is any one of triethylamine, dibutyltin dilaurate or tetrabutyl titanate.

[0025] The second technical solution adopted by the present invention is an integrated coating for abnormal discharge monitoring and self-repairing of cables, which is prepared by a preparation method of an integrated coating for abnormal discharge monitoring and self-repairing of cables.

[0026] The beneficial effects of the present invention are:

[0027] The present invention provides an integrated coating for cable abnormal discharge monitoring and self-repair and its preparation method. The piezoelectric material is driven by the tiny vibrations generated by the abnormal discharge of the cable to form a piezoelectric effect, and the abnormal discharge of the cable is monitored in real time and repaired in time. During the operation of the cable, once a partial discharge phenomenon occurs, the material can detect the problem in a timely and sensitive manner at an early stage, and buy valuable time for relevant personnel to take effective maintenance measures, thereby effectively avoiding the situation where the cable insulation damage caused by further development of the discharge continues to worsen, and greatly reducing the risk of safety accidents caused by cable failures. In addition, when the cable is unfortunately damaged by partial discharge, the piezoelectric-based microcapsules loaded with repair materials can respond to external stimuli at an extremely fast speed to release the repair material, and repair the cable in a timely and effective manner. In this way, the insulation performance of the cable can be quickly restored, effectively preventing a series of extremely dangerous safety accidents such as electric shock and fire that may be caused by insulation damage, greatly improving the safety of the cable during use, and providing a solid guarantee for the stable operation of the cable and the safety of people's lives and property. Therefore, by regulating the material composition and molecular level, the goal of integrating real-time monitoring and timely repair of abnormal cable discharge phenomena is achieved. In addition, the production cost is low and there are no special requirements for production equipment. It has good application prospects in the field of power cable repair materials. DETAILED DESCRIPTION

[0028] The present invention is described in detail below through specific embodiments.

[0029] The present invention provides a preparation method for an integrated coating for abnormal discharge monitoring and self-repair of cables, which is specifically implemented according to the following steps:

[0030] Step 1, preparing microcapsules carrying a repairing agent;

[0031] Step 1 is as follows:

[0032] The core material repair agent and the emulsifier are mixed in cyclohexane to form an oil phase, and the shell material monomer is dissolved in deionized water to form an aqueous phase. The interfacial polymerization method is used at a temperature of 40 to 70°C and a stirring speed of 500 to 2000 rpm. After stirring for 1 to 5 hours, the microcapsules loaded with the repair agent are obtained after centrifugal washing and freeze-drying.

[0033] Among them, the mass fractions of the core material repair agent, emulsifier and shell material monomer are respectively: core material repair agent 10-60%, emulsifier 1-10% and shell material monomer 30-89%, and the total of the above mass fractions is 100%.

[0034] The core material repair agent is any one of epoxy resin, bisphenol A epoxy resin, silicone rubber or polyurea; the shell material monomer is any one of urea-formaldehyde resin, melamine resin or gelatin-arabic gum; and the emulsifier is Span-80 or Tween-80.

[0035] Step 2, preparing an outer coating layer solution, adding the repair agent-loaded microcapsules into the outer coating layer solution to obtain piezoelectric-based material-coated repair agent-loaded microcapsules;

[0036] Step 2 is as follows:

[0037] 1-20% by mass of piezoelectric material and 1-6% by mass of pore-forming agent are dispersed in a mixed solution of N,N-methylenebisacrylamide DMF and acetone in a volume ratio of 5-8:2-5, and heated in a water bath at a temperature of 40-70°C and stirred for 1-5 hours to obtain an outer coating layer solution. The repair-carrying microcapsules obtained in step 1 are added to the outer coating layer solution, and after immersion for 6-24 hours, piezoelectric-based material-coated repair agent-carrying microcapsules are obtained.

[0038] The piezoelectric material is any one of polyvinylidene fluoride (PVDF), polyvinylidene fluoride-trifluoroethylene or polyvinylidene fluoride-hexafluoropropylene; and the pore-forming agent is any one of sodium chloride, polyethylene oxide or sucrose.

[0039] Step 3, washing the piezoelectric-based material-coated repair agent-loaded microcapsules in deionized water at a temperature of 30 to 80° C. for 2 to 8 hours to remove the pore-forming agent, and then freeze-drying to obtain porous piezoelectric-based material-coated repair agent-loaded microcapsules;

[0040] Step 4: The repair agent-loaded microcapsules coated with the porous piezoelectric-based material obtained in step 3 are mixed with the coating carrier, dispersant, curing agent and catalyst in a set ratio to obtain a coating.

[0041] Step 4 is as follows:

[0042] The porous piezoelectric-based material-coated repair agent microcapsules obtained in step 3 are mixed with a coating carrier, a dispersant, a curing agent and a catalyst in a set ratio, and stirred at a high speed of 1000 to 5000 rpm for 10 to 120 minutes to uniformly disperse the components to obtain a coating.

[0043] The mass fraction of the repair agent-carrying microcapsules coated with the porous piezoelectric-based material is 10-50%, the mass fraction of the coating carrier material is 30-75%, the mass fraction of the dispersant is 1-5%, the mass fraction of the curing agent is 5-30% and the mass fraction of the catalyst is 0.1-2%, and the total mass fraction of the above components is 100%.

[0044] The coating carrier material is any one of epoxy resin, polyurethane or acrylic resin; the dispersant is any one of sodium lauryl sulfate, sodium polyacrylate or sodium polycarboxylate; the curing agent is any one of ethylenediamine, diethylenetriamine or phthalic anhydride; and the catalyst is any one of triethylamine, dibutyltin dilaurate or tetrabutyl titanate.

[0045] The present invention also provides a cable partial abnormal discharge repair coating, which is prepared by adopting the above preparation method.

[0046] Example 1

[0047] This embodiment provides a cable partial abnormal discharge repair coating and a preparation method thereof, and the specific steps are as follows:

[0048] Step 1: 10% by mass of epoxy resin and 1% by mass of Span-80 are mixed in cyclohexane to form an oil phase, 30% by mass of melamine resin is dissolved in deionized water to form an aqueous phase, and the mixture is stirred at 40°C and 500 rpm for 1 hour, followed by centrifugal washing and freeze-drying to obtain repair agent-loaded microcapsules;

[0049] Step 2, preparing an outer coating layer solution, adding the repair agent-loaded microcapsules into the outer coating layer solution to obtain the repair agent-loaded microcapsules coated with the piezoelectric-based material;

[0050] 1% polyvinylidene fluoride and 1% sodium chloride were dispersed in a mixed solution of N,N-methylenebisacrylamide (DMF) and acetone in a volume ratio of 7:3, and the mixture was heated in a water bath at 40°C and stirred for 31 hours to obtain an outer coating solution. The repair-carrying microcapsules obtained in step 1 were added to the outer coating solution and immersed for 6 hours to obtain piezoelectric-based material-coated repair agent-carrying microcapsules;

[0051] Step 3: Wash the piezoelectric-based material-coated repair agent-loaded microcapsules obtained in step 2 in 50° C. deionized water for 2 hours to remove the pore-forming agent, and then freeze-dry to obtain porous piezoelectric-based material-coated repair agent-loaded microcapsules.

[0052] Step 4: The repair agent-loaded microcapsules coated with 10% porous piezoelectric-based material, 30% polyurethane, 1% sodium lauryl sulfate, 5% ethylenediamine and 0.1% dibutyltin dilaurate obtained in step 3 are stirred at a high speed of 1000 rpm and a stirring time of 10 minutes to uniformly disperse the components to obtain an integrated coating for cable abnormal discharge monitoring and self-repair.

[0053] Example 2

[0054] This embodiment provides a cable partial abnormal discharge repair coating and a preparation method thereof, and the specific steps are as follows:

[0055] Step 1: 30% by mass of bisphenol A epoxy resin and 5% by mass of Tween-80 are mixed in cyclohexane to form an oil phase, 60% of gelatin-gum arabic is dissolved in deionized water to form an aqueous phase, and the mixture is stirred at 55° C. and 1000 rpm for 3 hours, followed by centrifugal washing and freeze-drying to obtain repair agent-loaded microcapsules;

[0056] Step 2, preparing an outer coating layer solution, adding the repair agent-loaded microcapsules into the outer coating layer solution to obtain the repair agent-loaded microcapsules coated with the piezoelectric-based material;

[0057] 10% polyvinylidene fluoride-trifluoroethylene and 3% polyethylene oxide were dispersed in a mixed solution of N,N-methylenebisacrylamide and acetone in a volume ratio of 7:4, and the mixture was heated in a water bath at 50°C and stirred for 3 hours to obtain an outer coating solution. The repair-carrying microcapsules obtained in step 1 were added to the outer coating solution and immersed for 12 hours to obtain piezoelectric-based material-coated repair agent microcapsules;

[0058] Step 3: Wash the piezoelectric-based material-coated repair agent-loaded microcapsules obtained in step 2 in 50° C. deionized water for 3 hours to remove the pore-forming agent, and then freeze-dry to obtain porous piezoelectric-based material-coated repair agent-loaded microcapsules.

[0059] Step 4: The repair agent-loaded microcapsules coated with 30% porous piezoelectric-based material obtained in step 3, 55% acrylic resin, 3% sodium polyacrylate, 18% diethylenetriamine and 1% triethylamine are stirred at a high speed of 2500 rpm and a stirring time of 60 minutes to uniformly disperse the components to obtain an integrated coating for cable abnormal discharge monitoring and self-repair.

[0060] Example 3

[0061] This embodiment provides a cable partial abnormal discharge repair coating and a preparation method thereof, and the specific steps are as follows:

[0062] Step 1: 60% silicone rubber and 10% Tween-80 are mixed in cyclohexane to form an oil phase, and 89% urea-formaldehyde resin is dissolved in deionized water to form an aqueous phase. The mixture is stirred at 70°C and 2000 rpm for 5 hours, followed by centrifugal washing and freeze-drying to obtain repair agent-loaded microcapsules.

[0063] Step 2, preparing an outer coating layer solution, adding the repair agent-loaded microcapsules into the outer coating layer solution to obtain the repair agent-loaded microcapsules coated with the piezoelectric-based material;

[0064] Disperse 20% polyvinylidene fluoride-hexafluoropropylene by mass and 6% sucrose in a mixed solution of N,N-methylenebisacrylamide and acetone in a volume ratio of 8:5, and heat and stir in a water bath at 70°C for 5 hours to obtain an outer coating solution. Add the repair-carrying microcapsules obtained in step 1 to the outer coating solution, and immerse for 24 hours to obtain piezoelectric-based material-coated repair agent-carrying microcapsules.

[0065] Step 3: Wash the piezoelectric-based material-coated repair agent-loaded microcapsules obtained in step 2 in 50° C. deionized water for 2 hours to remove the pore-forming agent, and then freeze-dry to obtain porous piezoelectric-based material-coated repair agent-loaded microcapsules.

[0066] Step 4: The repair agent-loaded microcapsules coated with 50% porous piezoelectric-based materials, 75% polyurethane, 5% sodium polycarboxylate, 30% phthalic anhydride and 2% triethylamine obtained in step 3 are stirred at a high speed of 5000 rpm and a stirring time of 120 min to uniformly disperse the components to obtain an integrated coating for cable abnormal discharge monitoring and self-repair.

[0067] Example 4

[0068] This embodiment provides a cable partial abnormal discharge repair coating and a preparation method thereof, and the specific steps are as follows:

[0069] Step 1: 50% by mass of bisphenol A epoxy resin and 5% by mass of Span-80 are mixed in cyclohexane to form an oil phase, 45% of gelatin-gum arabic is dissolved in deionized water to form an aqueous phase, and the mixture is stirred at 60°C and 1500 rpm for 4 hours, followed by centrifugal washing and freeze-drying to obtain repair agent-loaded microcapsules;

[0070] Step 2: 10% polyvinylidene fluoride-trifluoroethylene and 3% polyethylene oxide (dispersed in a mixed solution of N,N-methylenebisacrylamide and acetone with a volume ratio of 6:4, heated in a water bath at 60°C and stirred for 3 hours to obtain an outer coating solution, and the repair microcapsules obtained in step 1 were added to the outer coating solution. After immersion for 12 hours, piezoelectric-based material-coated repair agent microcapsules were obtained;

[0071] Step 3: Wash the piezoelectric-based material-coated repair agent-loaded microcapsules obtained in step 2 in deionized water at 60° C. for 6 hours to remove the pore-forming agent, and then freeze-dry to obtain porous piezoelectric-based material-coated repair agent-loaded microcapsules.

[0072] Step 4: The repair agent-loaded microcapsules coated with 25% porous piezoelectric-based material, 58% polyurethane, 1% sodium lauryl sulfate, 15% diethylenetriamine and 1% dibutyltin dilaurate obtained in step 3 are stirred at a high speed of 4000 rpm and a stirring time of 120 min to uniformly disperse the components to obtain an integrated coating for cable local abnormal discharge monitoring and self-repair.

Claims

1. A method for preparing an integrated coating for cable abnormal discharge monitoring and self-repairing, characterized in that: Please follow the steps below to implement it: Step 1, preparing microcapsules carrying a repairing agent; Step 2, preparing an outer coating layer solution, adding the repair agent-loaded microcapsules into the outer coating layer solution to obtain piezoelectric-based material-coated repair agent-loaded microcapsules; Step 3, washing the piezoelectric-based material-coated repair agent-loaded microcapsules in deionized water at a temperature of 30 to 80° C. for 2 to 8 hours to remove the pore-forming agent, and then freeze-drying to obtain porous piezoelectric-based material-coated repair agent-loaded microcapsules; Step 4: The repair agent-loaded microcapsules coated with the porous piezoelectric-based material obtained in step 3 are mixed with the coating carrier, dispersant, curing agent and catalyst according to a set ratio to obtain a coating.

2. The method for preparing the integrated coating for cable abnormal discharge monitoring and self-repairing according to claim 1, characterized in that: The step 1 is specifically as follows: The core material repair agent and the emulsifier are mixed in cyclohexane to form an oil phase, and the shell material monomer is dissolved in deionized water to form an aqueous phase. The interfacial polymerization method is used at a temperature of 40 to 70°C and a stirring speed of 500 to 2000 rpm. After stirring for 1 to 5 hours, the microcapsules loaded with the repair agent are obtained after centrifugal washing and freeze-drying.

3. The method for preparing the integrated coating for cable abnormal discharge monitoring and self-repairing according to claim 2, characterized in that: The mass fractions of the core material repair agent, emulsifier and shell material monomer are respectively: 10-60% of the core material repair agent, 1-10% of the emulsifier and 30-89% of the shell material monomer, and the total of the above mass fractions is 100%.

4. The method for preparing the integrated coating for cable abnormal discharge monitoring and self-repairing according to claim 3, characterized in that: The core material repair agent is any one of epoxy resin, bisphenol A epoxy resin, silicone rubber or polyurea; the shell material monomer is any one of urea-formaldehyde resin, melamine resin or gelatin-arabic gum; and the emulsifier is Span-80 or Tween-80.

5. The method for preparing the integrated coating for cable abnormal discharge monitoring and self-repairing according to claim 1, characterized in that: The step 2 is specifically as follows: 1-20% by mass of piezoelectric material and 1-6% by mass of pore-forming agent are dispersed in a mixed solution of N,N-methylenebisacrylamide DMF and acetone in a volume ratio of 5-8:2-5, and heated in a water bath at a temperature of 40-70°C and stirred for 1-5 hours to obtain an outer coating layer solution. The repair-carrying microcapsules obtained in step 1 are added to the outer coating layer solution, and after immersion for 6-24 hours, piezoelectric-based material-coated repair agent-carrying microcapsules are obtained.

6. The method for preparing the integrated coating for cable abnormal discharge monitoring and self-repairing according to claim 5, characterized in that: The piezoelectric material is any one of polyvinylidene fluoride, polyvinylidene fluoride-trifluoroethylene or polyvinylidene fluoride-hexafluoropropylene; The pore-forming agent is any one of sodium chloride, polyethylene oxide or sucrose.

7. The method for preparing the integrated coating for cable abnormal discharge monitoring and self-repairing according to claim 1, characterized in that: The step 4 is specifically as follows: The porous piezoelectric-based material-coated repair agent microcapsules obtained in step 3 are mixed with a coating carrier, a dispersant, a curing agent and a catalyst in a set ratio, and stirred at a high speed of 1000 to 5000 rpm for 10 to 120 minutes to uniformly disperse the components to obtain a coating.

8. The method for preparing the integrated coating for cable abnormal discharge monitoring and self-repairing according to claim 7, characterized in that: The mass fraction of the repair agent-carrying microcapsules coated with the porous piezoelectric-based material is 10-50%, the mass fraction of the coating carrier material is 30-75%, the mass fraction of the dispersant is 1-5%, the mass fraction of the curing agent is 5-30% and the mass fraction of the catalyst is 0.1-2%, and the total mass fraction of the above components is 100%.

9. The method for preparing the integrated coating for cable abnormal discharge monitoring and self-repairing according to claim 8, characterized in that: The coating carrier material is any one of epoxy resin, polyurethane or acrylic resin; the dispersant is any one of sodium lauryl sulfate, sodium polyacrylate or sodium polycarboxylate; the curing agent is any one of ethylenediamine, diethylenetriamine or phthalic anhydride; and the catalyst is any one of triethylamine, dibutyltin dilaurate or tetrabutyl titanate.

10. Used for cable abnormal discharge monitoring and self-repair integrated coating, characterized in that: The coating is prepared by the preparation method for cable abnormal discharge monitoring and self-repairing integrated coating according to any one of claims 1 to 9.