Method for maintaining lightning conductor of wind power blade

Abstract

The invention relates to the technical field of wind power blade lightning protection, in particular to a wind power blade lightning conductor maintenance method, which comprises the following specific steps of S1, measuring resistance between a blade tip lightning arrester and a blade body lightning arrester, and determining a fracture position area of a lightning conductor and a problem lightning arrester; s2, a coating on the outer surface of the blade shell is polished; s3, repairing piece installation; s4, recovering a surface coating of the blade shell; and S5, checking the resistance value to determine whether conduction is recovered or not. The conductivity of the blade lightning protection system can be recovered without entering the blade to maintain the lightning conductor, the problem of failure of the lightning protection system caused by narrow fracture space of the lightning conductor in the blade and incapability of entering the blade to maintain the lightning conductor is solved, and the lightning stroke safety of the blade can be ensured more permanently; the maintenance method is relatively easy to operate, high in operability and high in maintenance efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine blade lightning protection, and in particular to a wind turbine blade lightning arrester maintenance method. Background Art

[0002] As an important component of wind power generation, wind turbine blades are mostly installed in open and tall areas. They are located at a high position and are more likely to be struck by lightning. Wind turbine blades are all designed for lightning protection. The lightning protection design commonly used at present is in the form of internal lightning conductor + tip and blade body lightning arrester. The internal lightning conductor usually uses aluminum wire and copper wire. With the development of large-scale wind turbines, the length of wind turbine blades is also increasing, and the deformation of the blades is also increasing. The internal lightning conductor of the blade may break. If the break occurs at the tip of the blade, due to the small space, personnel cannot enter to work, and the lightning conductor cannot be repaired. If the lightning conductor is broken and cannot be repaired, it will not be able to continue to conduct lightning, resulting in the failure of the entire lightning protection system, which is a high risk; therefore, it is necessary to find a method to solve the problem of the lightning conductor of wind turbine blades being broken and unable to be repaired.

[0003] Publication number: CN114576108A A method for repairing the offset of the copper mesh for lightning protection of wind turbine blades. The method realizes lightning protection and electrical conductivity in the area by adding a corrective copper mesh at the offset position of the copper mesh for structural design without destroying the copper mesh for structural design. The method for repairing the offset of the copper mesh for lightning protection of wind turbine blades specifically includes the following 8 steps: positioning of the offset area of ​​the copper mesh and external surface treatment; prefabrication and laying of the copper mesh connection assembly and the reinforced copper mesh; laying of the corrective copper mesh; laying of the surface felt or other glass fiber fabric on the outer surface of the copper mesh; arrangement of surface auxiliary materials, the injection system and the exhaust system; vacuum injection; surface treatment of the repair area and connection of the copper mesh connection assembly with the main lightning conductor of the blade. However, this application is to solve the problem of copper mesh offset in the production process of wind turbine blades containing carbon fiber beams. The existing lightning protection system structure cannot be used. The installation and fixation of the connection assembly is relatively complicated. In addition, the small space at the tip of the blade makes it inconvenient for personnel to connect the copper mesh with the lightning conductor.

[0004] Therefore, it is necessary to find a lightning protection device and method that can be used to repair broken lightning conductors at the tip of large wind turbine blades, so as to solve the problem of lightning protection system failure caused by the small space at the tip of the blade and the inability of personnel to enter to repair the lightning conductor in the prior art. Summary of the invention

[0005] In view of this, the present invention aims to propose a wind turbine blade lightning conductor maintenance method to solve the problem of lightning protection system failure caused by the small space at the blade tip where personnel cannot enter to repair the lightning conductor.

[0006] In the past, most domestic wind turbine blades were below 90 meters, mostly 50-60 meters, and the deformation of the blade tip was small during operation, so the lightning conductor did not break. However, with the development of my country's wind power industry, the blade size has gradually expanded. At present, the production and installation of wind turbine blades made of fiberglass have been achieved with a length of more than 90 meters. When the blade length reaches more than 90 meters, the tip of the blade is more deformed during operation, which makes it easy for the lightning conductor to break. However, most of the installed fiberglass wind turbine blades now use the technical solution of internal lightning conductor + blade body lightning arrester for lightning protection.

[0007] The reason why FRP composite material wind turbine blades cannot use external lightning conductors is that when the lightning conductor is in the form of an external lightning conductor, the diameter of the lightning conductor is relatively thick, generally more than 50 square millimeters. When attached to the outside of the blade, it is easy to cause the blade to follow the shape poorly. At the same time, the linear speed of the blade tip can reach several hundred meters per second during operation, and the shape-following problem will cause more serious consequences. If a metal mesh is used, the exposed metal is easy to cause lightning strikes, damage the lightning conductor, and require repeated repairs.

[0008] At the same time, when the lightning conductor breaks, it needs to be repaired. However, the diameter space at the tip of the blade is about 200-300mm, and people cannot enter.

[0009] In order to solve the problem of repairing the broken lightning conductor of the existing fiberglass wind turbine blade, the present application restores conduction by setting a patch on the outer surface of the blade in the broken area. The main method includes confirming the location of the broken area of ​​the lightning conductor, pasting the patch on the outer side of the blade shell in the corresponding area, and detecting whether the conduction is restored. This method solves the problem of lightning protection system failure caused by the small space inside the blade where the lightning conductor is broken and personnel cannot enter for maintenance. It can ensure the lightning safety of the blade for a longer period of time, has strong operability and high maintenance efficiency.

[0010] In this application, the thickness of the patch is less than 1mm. For a blade with a length of 100 meters, the influence on the shape is small. In order to ensure the conductivity of the patch, the inventor limits the cross-sectional area of ​​the patch to be no less than the conductive cross-sectional area of ​​the blade lightning conductor. The width is generally 100-300mm, which ensures the conductivity of the patch. In addition, for large blades, the blade body lightning receptor generally exceeds the surface of the blade shell by 30-50mm, and the diameter of the lightning receptor is 6-12mm.

[0011] The technical solution of the present invention is implemented as follows: a wind turbine blade lightning arrester maintenance method, comprising the following specific steps:

[0012] S1: Determine the broken area of ​​the lightning conductor and the problematic lightning receptor by measuring the resistance between the blade tip lightning receptor and the blade body lightning receptor;

[0013] S2: After the fracture location area is determined, the outer surface coating of the blade shell in this area is polished;

[0014] S3: After grinding and cleaning, a patch is installed, one end of the patch in the length direction is connected to the blade tip lightning receptor, and one end of the patch away from the blade tip lightning receptor is connected to the problematic lightning receptor;

[0015] S4: After the repair is completed, the surface coating of the blade shell is restored;

[0016] S5: Measure the resistance from the blade tip lightning arrester to the blade root lightning conductor, and check the resistance value to determine whether conduction is restored.

[0017] Furthermore, in step S1, by measuring the resistance between the blade tip lightning rod and the blade body lightning rod respectively, when the resistance value measured from the blade body lightning rod to the blade tip lightning rod is infinite, the area is the broken position area of ​​the lightning conductor, and the blade body lightning rod is the problematic lightning rod.

[0018] Furthermore, in step S3, two ends of the repair piece are folded into a first connection portion and a second connection portion, respectively, the first connection portion is used to connect with the blade tip lightning receptor, and the second connection portion is used to connect with the problematic lightning receptor.

[0019] Furthermore, in step S3, the patch and the blade tip lightning receptor, and the patch and the problematic lightning receptor are connected by rivet riveting or screw fastening.

[0020] Furthermore, the connection surface area between the first connection portion and the blade tip lightning receptor and the connection surface area between the second connection portion and the problematic lightning receptor are not less than the longitudinal cross-sectional area of ​​the repair piece.

[0021] Furthermore, in step S3, the patch and the blade tip lightning receptor, and the patch and the problematic lightning receptor are connected via connectors.

[0022] Furthermore, the connecting member includes a connecting seat, a boss and a through hole, the connecting seat is a cylinder, the boss is arranged with one end of the connecting seat, the center lines of the connecting seat and the boss are coaxial, the connecting seat is used to connect the problematic lightning rod or the blade tip lightning rod, the boss is used to crimp the repair plate, and the through hole is arranged in the axial direction of the connecting seat and the boss.

[0023] Furthermore, in step S3, after the repair sheet is made into a preform, the repair sheet preform is bonded to the blade shell by an adhesive, or the repair sheet is directly bonded to the blade shell by the adhesive.

[0024] Furthermore, the steps for making the patch preform are as follows: firstly, the patch is placed on a mold, fiberglass cloth is laid on top of the patch, pad cloth is laid on both sides to ensure a smooth surface, a vacuum environment is established, resin is poured, and the patch preform is demoulded after heating and curing to obtain the patch preform.

[0025] Furthermore, in step S3, after the repair sheet is directly bonded to the blade shell, a sealant is applied to the outer surface and edge of the repair sheet to protect the transition.

[0026] Compared with the prior art, the wind turbine blade lightning arrester repair method of the present invention has the following advantages:

[0027] 1. The present invention can restore the conductivity of the blade lightning protection system without entering the blade to repair the lightning protection wire, which solves the problem of lightning protection system failure caused by the small space inside the blade where the lightning protection wire is broken and personnel cannot enter for repair, and can more durably ensure the lightning safety of the blade; this maintenance method is relatively easy to operate, has strong operability, and high maintenance efficiency.

[0028] 2. The present invention effectively increases the contact area between the patch and the blade tip lightning receptor, and between the patch and the problematic lightning receptor by providing the first connecting portion and the second connecting portion, thereby ensuring the conductivity of the connection between the patch and the original lightning protection system.

[0029] 3. The present invention effectively increases the contact area between the patch and the blade tip lightning receptor, and between the patch and the problematic lightning receptor by providing a connecting piece, thereby shortening the maintenance time, ensuring the conductivity of the connection between the patch and the original lightning protection system, and improving the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 A schematic diagram of repairing a lightning conductor break in a lightning protection form for wind turbine blades;

[0032] Figure 2 It is a form of bonding the repair piece to the blade shell;

[0033] Figure 3 It is another form of bonding the repair piece to the blade shell;

[0034] Figure 4 is a schematic diagram of the patch structure;

[0035] Figure 5 A schematic diagram of the connector structure.

[0036] Description of reference numerals:

[0037] 1. Blade shell; 2. Lightning conductor; 3. Blade body lightning rod; 4. Blade tip lightning rod; 5. Problem lightning rod; 6. Repair piece; 7. Fiberglass cloth; 8. Pad; 9. Adhesive; 10. Sealant; 11. First connecting part; 12. Second connecting part; 13. Connector; 1301. Connecting seat; 1302. Boss; 1303. Through hole. DETAILED DESCRIPTION

[0038] In order to make the technical means, objectives and effects of the present invention easy to understand, the embodiments of the present invention are described in detail below with reference to specific drawings.

[0039] It should be noted that all the terms used in the present invention to indicate directionality and position, such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "top", "lower", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection status between the components in a certain state, and are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0042] The present invention discloses a wind turbine blade lightning arrester maintenance method, comprising the following specific steps:

[0043] S1: Determine the fracture location area of ​​the lightning conductor 2 and the problem lightning receptor 5 by measuring the resistance between the blade tip lightning receptor 4 and the blade body lightning receptor 3;

[0044] S2: After the fracture location area is determined, the outer surface coating of the blade shell 1 in this area is polished;

[0045] S3: After grinding and cleaning, the patch 6 is installed, one end of the patch 6 in the length direction is connected to the blade tip lightning receptor 4, and the end of the patch 6 away from the blade tip lightning receptor 4 is connected to the problematic lightning receptor 5;

[0046] S4: After the repair is completed, the surface coating of the blade shell 1 is restored;

[0047] S5: Measure the resistance from the blade tip lightning arrester 4 to the blade root lightning arrester 2, and check the resistance value to determine whether the conduction is restored.

[0048] Use a multimeter to measure the resistance between the blade tip lightning rod 4 and the blade body lightning rod 3, determine the approximate area where the lightning rod 2 is broken and the problematic lightning rod 5, determine the area to be repaired based on the measurement results, and mark it, grind the outer surface of the blade shell 1 in the marked area, remove the surface coating, ensure that the surface is clean and flat, and bond the prefabricated patch 6 to the specified position of the blade shell 1 with the adhesive 9, ensuring that one end of the patch 6 is connected to the blade tip lightning rod 4 and the other end is connected to the problematic lightning rod 5. Rivets or screws can be used to fix the patch 6 to the blade tip lightning rod 4 and the blade body lightning rod 3, apply sealant 10 on the outer surface and edge of the patch 6 for protection, ensure that the surface is flat and waterproof, and finally, measure the resistance from the blade tip lightning rod 4 to the blade root lightning rod 2 to confirm whether the conduction is restored.

[0049] The lightning conductor repair method sets a repair piece 6 on the outer surface of the blade shell 1, and there is no need to enter the interior of the blade shell 1 for repair, which reduces the difficulty and risk of operation. The operation is relatively simple, does not require complex equipment, has high maintenance efficiency, and can complete the repair with simple tools and materials. The cost is low and the processing is convenient. It can effectively ensure the conductivity of the lightning conductor 2, more durably protect the lightning safety of the blade shell 1, and ensure that the lightning conductor 2 resumes normal function.

[0050] Specifically, in step S1, by measuring the resistance between the blade tip lightning rod 4 and multiple blade body lightning rods 3 respectively, when the resistance value from a blade body lightning rod 3 to the blade tip lightning rod 4 is infinite, the area is the broken position area of ​​the lightning conductor 2, and the blade body lightning rod 3 is the problematic lightning rod 5.

[0051] Use a resistance measuring instrument to measure the resistance value between the blade tip lightning rod 4 and each blade body lightning rod 3. When the measured value is infinite or much higher than the normal value, it means that the section of lightning rod 2 is broken or has a poor contact problem. It can be preliminarily determined that the lightning rod 2 at the location of the blade body lightning rod 3 is broken. Combined with the actual blade structure and the layout of the lightning rod 2, the specific area of ​​the break can be further narrowed down. The blade body lightning rod 3 is the problematic lightning rod 5.

[0052] This setting can quickly determine the approximate position of the lightning conductor 2 through simple resistance measurement, thereby providing a clear direction for subsequent inspection and repair work. The specific size of the resistance value can help to accurately judge the specific situation of the lightning conductor 2 without causing any damage to the blade shell 1 structure. The operation is relatively simple and fast, and the measurement cost is low.

[0053] Preferably, the resistance value is measured using a digital multimeter.

[0054] This setting uses a digital multimeter to measure the resistance value. The operation is simple and quick, and the operating skills are low. The data can be obtained quickly, and the resistance value is accurate and reliable, which helps to judge the health of the lightning conductor 2.

[0055] Specifically, in step S3, the patch sheet 6 may be a metal mesh or a metal foil, the thickness of the patch sheet 6 does not exceed 1 mm, and the width ranges from 100 to 300 mm.

[0056] Setting the patch sheet 6 as a metal mesh or metal foil can ensure that the patch sheet 6 has good conductivity and mechanical strength; the thickness of the patch sheet 6 does not exceed 1 mm, which can ensure that the patch sheet 6 has sufficient conductivity and better fits the surface of the blade shell 1 after bonding, without forming obvious protrusions or depressions, maintaining the original curved shape of the blade shell 1, and not significantly changing the aerodynamic characteristics of the blade shell 1; the width range of the patch sheet 6 is 100-300 mm, so that the patch sheet 6 has a sufficient cross-sectional area, which helps to ensure the conductivity of the patch sheet 6.

[0057] This arrangement can ensure that the repair piece 6 has excellent electrical conductivity and high mechanical strength, maintains long-term stability in harsh environments, ensures the safe operation of the wind turbine blade lightning protection system, and further improves the reliability and service life of the wind turbine blades.

[0058] Preferably, the thickness of the patch 6 is 0.3 mm.

[0059] The thickness of 0.3 mm enables the patch 6 to better fit the blade surface without forming obvious protrusions or depressions, maintaining the original curved shape of the blade, and not significantly changing the aerodynamic characteristics of the blade shell 1, thereby reducing wind resistance and maintaining the efficiency of the blade.

[0060] This arrangement can keep the surface of the blade shell 1 smooth, reduce wind resistance, improve the aerodynamic performance of the blade shell 1, reduce wind noise, and make the installation of the repair piece 6 easier, especially for blade surfaces with larger curvatures, ensuring that the repair piece 6 fits tightly to the blade surface to maintain its appearance.

[0061] Specifically, in step S3, the connection between the patch 6 and the blade tip lightning receptor 4 and between the patch 6 and the defective lightning receptor 5 can be made by rivet riveting or screw fastening.

[0062] Whether rivet riveting or screw fastening is used, reliable conductive connection between the patch 6 and the blade tip lightning receptor 4, and between the patch 6 and the problematic lightning receptor 5 can be ensured, ensuring smooth conduction of lightning current. Rivet riveting has good sealing and reliability, while screw fastening has detachability and adjustability. By reasonably selecting the connection method, the safe operation of the wind turbine blade lightning protection system can be ensured, and the reliability of the system can be further improved through regular inspection and maintenance, which can minimize the impact on blade performance and improve the reliability and service life of wind turbine blades.

[0063] This arrangement ensures that the connection strength between the patch 6 and the blade tip lightning receptor 4 and between the patch 6 and the problematic lightning receptor 5 is relatively high, so that they can withstand relatively high external loads, are convenient for rapid installation on site, and have high reliability.

[0064] Specifically, two ends of the patch 6 are folded into a first connection portion 11 and a second connection portion 12 , respectively. The first connection portion 11 is used to connect to the blade tip lightning receptor 4 , and the second connection portion 12 is used to connect to the problematic lightning receptor 5 .

[0065] The two ends of the patch 6 are folded into a first connecting portion 11 and a second connecting portion 12 respectively, thereby avoiding excessive resistance caused by insufficient connection area between the patch 6 and the blade tip lightning rod 4 and between the patch 6 and the problematic lightning rod 5, which affects the reliable conductive connection between the patch 6 and the blade tip lightning rod 4 and between the patch 6 and the problematic lightning rod 5, thereby ensuring that the lightning current can be smoothly conducted.

[0066] This setting helps to ensure the conductivity between the repair piece 6 and the blade tip lightning rod 4, and between the repair piece 6 and the problematic lightning rod 5, ensuring that the current can be effectively conducted. It has high connection strength, high reliability, and is convenient for on-site installation. Through reasonable design and connection methods, it can minimize the impact on blade performance and improve the reliability and service life of the wind turbine blade lightning protection system.

[0067] Preferably, the first connecting portion 11 and the second connecting portion 12 are triangular or semicircular.

[0068] Preferably, the first connecting portion 11 and the second connecting portion 12 may be preset holes or other forms of connecting components.

[0069] Specifically, the connection surface area between the first connection portion 11 and the blade tip lightning receptor 4 and the connection surface area between the second connection portion 12 and the problematic lightning receptor 5 are not less than the longitudinal cross-sectional area of ​​the repair piece 6 .

[0070] The larger connection surface area can ensure good conductivity between the first connection part 11 and the blade tip lightning rod 4, and between the second connection part 12 and the problem lightning rod 5, so that the lightning current can be effectively conducted. At the same time, the stability of the connection is ensured, stress can be dispersed, and material fatigue and damage caused by stress concentration can be reduced.

[0071] This arrangement can avoid the influence of large resistance caused by insufficient connection area on the conductive performance of the connection structure, and helps to ensure reliable connection between the patch 6 and the lightning arrester and smooth conduction of lightning current, while reducing failures caused by loose connections.

[0072] Specifically, the patch 6 and the blade tip lightning receptor 4 , as well as the patch 6 and the problematic lightning receptor 5 are connected via the connector 13 .

[0073] The connector 13 ensures reliable electrical connection between the patch 6 and the blade tip lightning rod 4, and between the patch 6 and the problematic lightning rod 5, ensuring that the lightning current can be smoothly transmitted from the blade tip lightning rod 4 to the problematic lightning rod 5, and then transmitted to the ground through the lightning conductor 2, thereby preventing damage to the blades caused by lightning strikes.

[0074] This arrangement can quickly and conveniently connect the repair piece 6 with the blade tip lightning receptor 4 and the problematic lightning receptor 5 through the connecting piece 13, thereby reducing maintenance time, improving maintenance efficiency, and reducing maintenance costs.

[0075] Specifically, the connecting member 13 includes a connecting seat 1301, a boss 1302 and a through hole 1303. The connecting seat 1301 is a cylinder. The boss 1302 is arranged at one end of the connecting seat 1301. The center lines of the connecting seat 1301 and the boss 1302 are coaxial. The connecting seat 1301 is used to connect the problematic lightning rod 5 or the blade tip lightning rod 4. The boss 1302 is used to crimp the repair piece 6. The through hole 1303 is arranged in the axial direction of the connecting seat 1301 and the boss 1302.

[0076] The through hole 1303 is arranged in the axial direction of the connecting seat 1301 and the boss 1302, so that the connecting seat 1301 is a hollow cylindrical structure, which can be put on the problematic lightning rod 5 or the blade tip lightning rod 4 to ensure close contact and good electrical connection. The boss 1302 is used to crimp the repair piece 6, which expands the contact area between the connecting piece 13 and the repair piece 6, ensuring a reliable connection between the repair piece 6 and the problematic lightning rod 5 or the blade tip lightning rod 4, and has a good conductive effect.

[0077] The arrangement has a simple structure, is easy to process, can improve maintenance efficiency and reliability, and has wide applicability.

[0078] Preferably, the connection seat 1301 and the boss 1302 are connected with each other in a smooth transition.

[0079] The smooth transition connection can ensure that the conductive path between the connection base 1301 and the boss 1302 is smoother and reduce resistance.

[0080] This setting can reduce energy loss during current transmission, improve conductivity, and ensure that lightning current can be quickly transmitted to the ground.

[0081] Preferably, the thickness of the boss 1302 does not exceed 2 mm.

[0082] The thickness of the boss 1302 does not exceed 2 mm, which can reduce the protruding portion on the blade surface, making installation and disassembly more convenient; the thinner boss 1302 can reduce the overall weight of the connector 13.

[0083] In the maintenance process, the smaller thickness of the boss 1302 can reduce interference with the blade surface, improve the efficiency of installation and disassembly, and reduce the weight to reduce the burden on the blade structure, thereby improving the operating efficiency and safety of the blade.

[0084] Specifically, the connecting piece 13 is connected to the problematic lightning arrester 5 by welding, riveting, screwing or threading.

[0085] Specifically, the through hole 1303 is connected to the problematic lightning arrester 5 by interference fit.

[0086] Specifically, in step S3 , the repair piece 6 can be first made into a preform, and then the preform is bonded to the blade shell 1 by the adhesive 9 , or the repair piece 6 can be directly bonded to the blade shell 1 by the adhesive 9 .

[0087] Whether using prefabricated parts or direct bonding, reliable conductive connection between the patch 6 and the blade tip lightning receptor 4, and between the patch 6 and the problematic lightning receptor 5 can be ensured, ensuring that the lightning current can be smoothly conducted. The use of prefabricated parts for repair can make up for the surface defects of the blade shell 1. By processing the surface defects of the blade shell 1 into a standard shape, the installation of prefabricated parts is convenient, the repair efficiency is improved, and the influence of the surface defects of the blade shell 1 on the bonding effect of the patch 6 is reduced; and the direct bonding method can achieve rapid repair, especially when there are no defects on the surface of the blade shell 1, the effect is obvious. Through bonding with adhesive 9, the connection strength between the patch 6 and the blade shell 1 is improved, and it can withstand external loads such as wind. The prefabricated parts or direct bonding methods make the installation of the patch 6 easier, reduce the complexity of on-site operations, make the connection between the patch 6 and the blade shell 1 more stable, and reduce failures caused by loose connections.

[0088] This arrangement can ensure good conductivity between the repair piece 6 and the blade tip lightning rod 4, and between the repair piece 6 and the problematic lightning rod 5, can solve various surface conditions of the blade shell 1 during the actual repair process, improve mechanical strength, simplify the installation process, enhance durability, and facilitate inspection and maintenance. Through reasonable design and connection methods, the impact on blade performance can be minimized, and the reliability and service life of the wind turbine blade lightning protection system can be improved.

[0089] Specifically, the steps for making the repair piece 6 preform are as follows: first place the repair piece 6 on the mold, lay glass fiber cloth 7 on it, lay pad cloth 8 on both sides to ensure the surface is flat, establish a vacuum environment, perform resin infusion, heat and cure, and then demould to obtain the repair piece 6 preform.

[0090] The mechanical strength of the patch 6 is enhanced by the glass fiber cloth 7 to ensure the stability of the patch 6 under various weather conditions. The pad cloth 8 ensures the flatness of the surface, improves the surface quality of the patch 6, and reduces wind resistance. Through resin curing, the connection between the patch 6 and the glass fiber cloth 7 is more stable, reducing failures caused by loose connections. The production of prefabricated parts makes the installation of the patch 6 easier and reduces the complexity of on-site operations.

[0091] The production of the prefabricated parts can ensure that the patch 6 has good mechanical strength, conductivity and surface quality, making the connection between the patch 6 and the blade shell 1 more reliable. The design of the prefabricated parts not only simplifies the installation process, improves durability and adaptability, but also has high cost-effectiveness and is easy to inspect and maintain.

[0092] Specifically, in step S3 , the width of the glass fiber cloth 7 is greater than the width of the repair piece 6 .

[0093] The width of the glass fiber cloth 7 is greater than that of the patch 6, which can ensure that the patch 6 has sufficient support at the edge and improve the mechanical strength. The portion where the glass fiber cloth 7 exceeds the width of the patch 6 can provide additional tensile strength to prevent the patch 6 from tearing or breaking during use, and ensure that the surface of the patch 6 is smoother and reduces gaps and bubbles during the resin curing process.

[0094] This arrangement can significantly improve the mechanical strength and surface quality of the patch 6 by ensuring that the width of the glass fiber cloth 7 is greater than the width of the patch 6, thereby making the connection between the patch 6 and the blade shell 1 more reliable.

[0095] Specifically, in step S3, after the repair sheet 6 is directly bonded to the blade shell 1, a sealant 10 is applied to the outer surface and edge of the repair sheet 6 to protect the transition.

[0096] The sealant 10 can prevent moisture from invading the gap between the repair piece 6 and the blade shell 1, avoid corrosion and oxidation, make the surface smoother, protect the repair piece 6 from environmental factors, extend the service life of the repair piece 6, enhance the impact resistance of the edge of the repair piece 6, and prevent edge damage.

[0097] The configuration can significantly improve the protective performance of the patch 6 and ensure its durability and stability in harsh environments by applying sealant 10 on the outer surface and edge of the patch 6. The application of sealant 10 can not only be waterproof and moisture-proof, but also improve the surface quality and simplify maintenance work.

[0098] Specifically, in step S5, the resistance value between the blade tip lightning receptor 4 and the blade root lightning conductor 2 is not greater than 50 mΩ.

[0099] A resistance value of no more than 50 mΩ ensures the continuity of the conductive path from the blade tip lightning rod 4 to the blade root lightning conductor 2. The lightning current can be smoothly conducted from the blade tip to the ground, ensuring the effectiveness of the system. The low resistance value can reduce energy loss during current transmission and prevent heating and failure caused by excessive resistance.

[0100] This arrangement can significantly improve the conductive performance, reliability and safety of the wind turbine blade lightning protection system by ensuring that the resistance value between the blade tip lightning receptor 4 and the blade root lightning conductor 2 is no more than 50 mΩ.

[0101] Example 1

[0102] like Figure 1 , 2 As shown in FIG. 3 , the present invention proposes a method for repairing a lightning conductor 2 of a wind turbine blade, comprising a blade shell 1 , a lightning conductor 2 , a blade body lightning arrester 3 , a blade tip lightning arrester 4 , a repair sheet 6 , a glass fiber cloth 7 , a pad cloth 8 , an adhesive 9 , and a sealant 10 .

[0103] The conduction is mainly restored by arranging a repair piece 6 on the outer surface of the blade shell 1 in the fractured area.

[0104] The repair method of the lightning conductor 2 includes: 1. By measuring the resistance of the blade tip lightning rod 4 and the blade body lightning rod 3 respectively, measuring which blade body lightning rod 3 to the blade root lightning conductor 2 has an infinite resistance value, the broken position area of ​​the lightning conductor 2 is determined. 2. After the area is determined, the outer surface coating of the blade shell 1 in this area is polished, and after polishing and cleaning, the repair piece 6 is bonded. One end of the repair piece 6 in the length direction is directly connected to the blade tip lightning rod 4, and the other end is directly connected to the problem lightning rod 5. The connection form can be riveted or screwed. 3. After the repair is completed, restore the surface coating of this area of ​​the blade shell 1. 4. Measure the resistance of the blade tip lightning rod 4 to the blade root lightning conductor 2, and check the resistance value to determine whether the lightning protection system has resumed conduction.

[0105] The patch 6 may be a metal mesh or a metal foil.

[0106] One form of bonding the patch 6 to the blade shell 1 is as follows: 1. The patch 6 and the glass fiber cloth 7 are prefabricated into one piece in advance on the blade manufacturing mold by resin infusion; the specific prefabrication steps are: place the patch 6 on the mold, and then lay the glass fiber cloth 7 on the patch 6. The width of the glass fiber cloth 7 should be greater than the width of the patch 6. At the same time, in order to ensure the flatness of the surface during prefabrication, some pads 8 are laid on both sides of the glass fiber cloth 7 to ensure the surface flatness, and then a vacuum is established for resin infusion. After heating, curing and demolding, the patch 6 prefabricated part can be obtained. 2. The patch 6 prefabricated part is bonded to the outside of the blade shell 1 by adhesive 9.

[0107] Another way of bonding the patch 6 to the blade shell 1 is as follows: 1. directly bonding the patch 6 to the blade shell 1 through the adhesive 9. 2. then applying a sealant 10 to the outer surface and edge of the patch 6 to protect the transition.

[0108] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wind turbine blade lightning arrester maintenance method, characterized in that: The specific steps include: S1: Determine the fracture location area of ​​the lightning conductor (2) and the problematic lightning conductor (5) by measuring the resistance between the blade tip lightning conductor (4) and the blade body lightning conductor (3); S2: After the fracture location area is determined, the outer surface coating of the blade shell (1) in this area is polished; S3: After grinding and cleaning, a repair piece (6) is installed, one end of the repair piece (6) in the length direction is connected to the blade tip lightning receptor (4), and the end of the repair piece (6) away from the blade tip lightning receptor (4) is connected to the problematic lightning receptor (5); S4: after the repair is completed, the surface coating of the blade shell (1) is restored; S5: Measure the resistance from the blade tip lightning receptor (4) to the blade root lightning conductor (2), and check the resistance value to determine whether conduction is restored.

2. The wind turbine blade lightning arrester maintenance method according to claim 1, characterized in that: In step S1, the resistance between the blade tip lightning receptor (4) and the blade body lightning receptor (3) is measured respectively. When the resistance value from the blade body lightning receptor (3) to the blade tip lightning receptor (4) is infinite, the region is the fracture position region of the lightning conductor (2), and the blade body lightning receptor (3) is the problematic lightning receptor (5).

3. The wind turbine blade lightning arrester maintenance method according to claim 1, characterized in that: In step S3, the two ends of the repair piece (6) are folded into a first connecting portion (11) and a second connecting portion (12), respectively, wherein the first connecting portion (11) is used to connect to the blade tip lightning receptor (4), and the second connecting portion (12) is used to connect to the problematic lightning receptor (5).

4. The wind turbine blade lightning arrester maintenance method according to claim 3, characterized in that: In step S3, the patch (6) and the blade tip lightning receptor (4), and the patch and the problematic lightning receptor (5) are connected by rivet riveting or screw fastening.

5. The wind turbine blade lightning arrester maintenance method according to claim 4, characterized in that: The connection surface area between the first connection part (11) and the blade tip lightning receptor (4), and the connection surface area between the second connection part (12) and the problematic lightning receptor (5) are not less than the longitudinal cross-sectional area of ​​the repair piece (6).

6. The wind turbine blade lightning arrester maintenance method according to claim 5, characterized in that: In step S3, the patch (6) and the blade tip lightning receptor (4), and the patch (6) and the problematic lightning receptor (5) are connected via a connector (13).

7. The wind turbine blade lightning arrester maintenance method according to claim 6, characterized in that: The connecting member (13) comprises a connecting seat (1301), a boss (1302) and a through hole (1303); the connecting seat (1301) is a cylinder; the boss (1302) is arranged at one end of the connecting seat (1301); the center lines of the connecting seat (1301) and the boss (1302) are coaxial; the connecting seat (1301) is used to connect the problematic lightning receptor (5) or the blade tip lightning receptor (4); the boss (1302) is used to press the repair piece (6); and the through hole (1303) is arranged in the axial direction of the connecting seat (1301) and the boss (1302).

8. The wind turbine blade lightning arrester repair method according to claim 7, characterized in that: In step S3, after the repair sheet (6) is made into a preform, the repair sheet (6) preform is bonded to the blade shell (1) via an adhesive (9), or the repair sheet (6) is directly bonded to the blade shell (1) via the adhesive (9).

9. The wind turbine blade lightning arrester maintenance method according to claim 8, characterized in that: The steps for making the patch (6) preform are as follows: firstly, the patch (6) is placed on a mold, a glass fiber cloth (7) is laid on the top, pad cloth (8) is laid on both sides to ensure a smooth surface, a vacuum environment is established, resin is poured, and after heating and curing, the patch (6) preform is demoulded to obtain the mold.

10. The wind turbine blade lightning arrester maintenance method according to claim 8, characterized in that: In step S3, after the repair sheet (6) is directly bonded to the blade shell (1), a sealant (10) is applied to the outer surface and edge of the repair sheet (6) to protect the transition.

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