Wind power plant lightning protection device and method

Abstract

The invention discloses a wind power plant lightning protection device and method, and the device comprises a suspension part which is provided with a lightning current receiving unit; the flow guide lines are installed on the outer side of the suspension part, the multiple flow guide lines are arranged along the outer side of the suspension part, and the angle difference between every two adjacent flow guide lines is 45 degrees; one end of each bonding assembly is connected with the suspension part, the other end of each bonding assembly is connected with a fixing unit through a connecting part, and the fixing units are used for being connected with ground anchor points; one end of the grounding wire is connected with the suspension part, and the other end is connected with a grounding assembly. The suspension part is arranged above the wind power plant, the lightning current receiving unit at the top of the suspension part is used for receiving current generated by lightning flashover and lightning and transmitting the current to the ground, and the damage of lightning stroke is effectively avoided; and secondly, the diversion wires are arranged at intervals along the outer side of the suspension part at an angle of 45 degrees, so that the received lightning current can be more uniformly dispersed to multiple directions, the local current density is reduced, and the service life of the lightning protection device is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind farm lightning protection, and in particular relates to a wind farm lightning protection device and method. Background Art

[0002] As more and more new energy stations are put into operation in China, the problems they face are also coming one after another. One of the most serious problems is the tripping of the collector line due to lightning strikes. Among them, the new energy stations in mountainous areas such as Southwest my country and Guangxi have unique geographical characteristics. The mountainous terrain is 2000m~2400m above sea level. The terrain is complex. Under the high altitude and mountainous environment, the collector line is located in a prominent position, the ground inclination is large, and the ground shielding effect is reduced. Therefore, due to its unique geographical factors, the entire line often causes tripping incidents caused by lightning strikes.

[0003] At present, the lightning protection of wind farm collector lines mainly depends on the lightning resistance of the lines themselves, such as installing lightning arresters, reducing grounding resistance, etc. These methods have limited action time and scope, and are all passive lightning protection measures that cannot actively lead lightning into the ground. For example, the life of the installed lightning arrester is greatly reduced after multiple lightning strikes, especially when it is struck by lightning multiple times in a short period of time, which can easily cause thermal collapse and explosion; for example, the reduced grounding resistance, the construction difficulty of modifying the grounding resistance in a high-altitude mountain environment is huge and the effectiveness of the construction cannot be guaranteed.

[0004] Therefore, in view of the shortcomings of passive lightning protection measures, active lightning-inducing lightning protection devices are needed. At present, for active lightning-inducing lightning protection devices, there are various tower-type independent lightning rods on the market, with different structures, but the same working principle, all of which introduce lightning current into the earth through the top lightning rod, but they also have two shortcomings: First, the construction is difficult. For some lines on the top of the mountain, it is difficult to transport steel materials for the construction of tower-type lightning rods near them, and the welding and assembly of the towers are difficult; second, the construction cost is high. For the construction of tower-type lightning rods, the labor cost and material cost are huge. Summary of the invention

[0005] The object of the present invention is to provide a wind farm lightning protection device and method, so as to solve the technical defects of the prior art that the lightning protection tower is difficult to install and has high construction cost.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, a wind farm lightning protection device is provided, comprising: A suspended member, on which a lightning current receiving unit is provided; A guide line is installed on the outside of the suspension, and a plurality of guide lines are arranged along the outside of the suspension, and the angle difference between two adjacent guide lines is 45 degrees; Adhesive components are provided in plurality, one end of each of the adhesive components is connected to the suspension member, and the other end is connected to a fixing unit through a connecting member, and the fixing unit is used to connect to a ground anchor point; A grounding wire has one end connected to the suspension component and the other end connected to a grounding component.

[0007] Furthermore, the lightning receiving unit comprises a receiving end and a fixed end, the receiving end and the fixed end are an integral structure, and the receiving end and the fixed end are axially perpendicular to each other; The fixed end is installed on the top of the suspension member and is used to receive lightning current.

[0008] Furthermore, the fixed end is an arc-shaped structure, and the fixed end is bonded to the top of the suspension member.

[0009] Furthermore, the lightning receiving unit is a lightning receptor.

[0010] Furthermore, the guide wire is a flat copper wire made of soft material.

[0011] Furthermore, the bonding assembly includes a first bonding member and a second bonding member, the first bonding member is bonded to the surface of the suspension member, and the second bonding member is bonded to the first bonding member and connected to the connecting member.

[0012] Furthermore, the first adhesive member is a sheet-like structure.

[0013] Furthermore, the second adhesive member is an annular structure.

[0014] Furthermore, the suspension element is a helium balloon.

[0015] In a second aspect, a wind farm lightning protection method is provided, the method being performed using the lightning protection device as described above, comprising: Installing a lightning current receiving unit, a guide wire, a bonding assembly and a grounding wire on the suspension member; Connecting the suspension member to the grounding assembly via the grounding wire; Anchor points are installed in the lightning protection area, and the suspension parts are fixed to the anchor points by connecting parts.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By arranging suspension parts above the wind farm, the lightning current receiving unit on the top of the suspension parts receives the current generated by lightning flashes and lightning, and transmits the current to the ground, effectively avoiding the harm of lightning strikes; secondly, the guide wires are arranged at intervals of forty-five degrees along the outside of the suspension parts, which helps to disperse the received lightning current more evenly in multiple directions, reduce local current density, reduce the potential damage to the device structure caused by thermal effects and mechanical stress, and improve the service life of the lightning protection device; finally, the suspension parts are connected to the fixed units connected to the ground anchor points through multiple adhesive components and connectors, which enhances the overall stability of the lightning protection device and helps prevent the device from shifting or falling off under strong winds or lightning strikes, thereby ensuring the lightning protection effect.

[0017] 2. The receiving end and the fixed end are integrated into one structure, which improves the overall structural strength of the lightning receiving unit. Under the impact of lightning, it can better withstand and disperse the mechanical stress generated by lightning, reducing the risk of lightning protection failure caused by structural damage. The axial vertical design between the receiving end and the fixed end allows the receiving end to face the direction of the lightning strike more directly, which helps to maximize the exposure area of ​​the receiving end, thereby improving the efficiency of receiving lightning current. At the same time, the vertical structure also helps to reduce the refraction and reflection of lightning during the receiving process, further ensuring the receiving effect.

[0018] 3. The arc-shaped structure can better adapt to the shape of the top of the suspension, ensure the flatness and tightness of the bonding surface, improve the bonding strength, and make the connection between the fixed end and the suspension more firm and reliable.

[0019] 4. As a special lightning protection device, the lightning arrester can efficiently capture lightning discharges in wind farms and guide them to the subsequent lightning protection system, thereby effectively reducing the direct impact of lightning on wind power equipment.

[0020] 5. As a high-quality conductive material, flat copper wire has excellent conductive properties. In the lightning protection device, the soft flat copper wire can effectively conduct the lightning current from the receiving end to the grounding system, ensuring the stability and efficiency of current transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 An overall schematic diagram of the wind farm lightning protection device provided by the present invention; Figure 2A schematic diagram of a bonding assembly in a wind farm lightning protection device provided by the present invention; Figure 3 A flow chart of the wind farm lightning protection method provided by the present invention; Among them: 1. grounding component; 2. grounding wire; 3. fixing unit; 4. connecting part; 5. first adhesive part; 6. guide wire; 7. suspension part; 8. lightning current receiving unit. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] As more and more new energy stations are put into operation in China, the problems they face are also coming one after another. One of the most serious problems is the tripping of the collector line due to lightning strikes. Among them, the new energy stations in mountainous areas such as Southwest my country and Guangxi have unique geographical characteristics. The mountainous terrain is 2000m~2400m above sea level. The terrain is complex. Under the high altitude and mountainous environment, the collector line is located in a prominent position, the ground inclination is large, and the ground shielding effect is reduced. Therefore, due to its unique geographical factors, the entire line often causes tripping incidents caused by lightning strikes.

[0029] At present, the lightning protection of wind farm collector lines mainly depends on the lightning resistance of the lines themselves, such as installing lightning arresters, reducing grounding resistance, etc. These methods have limited action time and scope, and are all passive lightning protection measures that cannot actively lead lightning into the ground. For example, the life of the installed lightning arrester is greatly reduced after multiple lightning strikes, especially when it is struck by lightning multiple times in a short period of time, which can easily cause thermal collapse and explosion; for example, the reduced grounding resistance, the construction difficulty of modifying the grounding resistance in a high-altitude mountain environment is huge and the effectiveness of the construction cannot be guaranteed.

[0030] Therefore, in view of the shortcomings of passive lightning protection measures, active lightning-inducing lightning protection devices are needed. At present, for active lightning-inducing lightning protection devices, there are various tower-type independent lightning rods on the market, with different structures, but the same working principle, all of which introduce lightning current into the earth through the top lightning rod, but they also have two shortcomings: First, the construction is difficult. For some lines on the top of the mountain, it is difficult to transport steel materials for the construction of tower-type lightning rods near them, and the welding and assembly of the towers are difficult; second, the construction cost is high. For the construction of tower-type lightning rods, the labor cost and material cost are huge.

[0031] In order to solve the above technical defects, the inventor provides a wind farm lightning protection device and method.

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings: like Figure 1-Figure 2As shown, in the first aspect of an embodiment of the present invention, a wind farm lightning protection device is provided, including a suspension member 7, on which a lightning current receiving unit 8 is provided; a guide wire 6, which is installed on the outside of the suspension member 7, and a plurality of guide wires 6 are arranged along the outside of the suspension member 7, and the angle difference between two adjacent guide wires 6 is forty-five degrees; a plurality of adhesive components are provided, one end of the plurality of adhesive components is connected to the suspension member 7, and the other end is connected to a fixing unit 3 through a connecting member 4, and the fixing unit 3 is used to connect to a ground anchor point; a grounding wire 2, one end of which is connected to the suspension member 7, and the other end is connected to a grounding component 1. By arranging the suspension member 7 above the wind farm site, the lightning current receiving unit 8 on the top of the suspension member 7 is used to receive the current generated by lightning flashes and lightning, and transmit the current to the ground, thereby effectively avoiding the harm of lightning strikes; secondly, the guide wires 6 are arranged at intervals of forty-five degrees along the outer side of the suspension member 7, which helps to disperse the received lightning current more evenly in multiple directions, reduce local current density, reduce potential damage to the device structure caused by thermal effects and mechanical stress, and improve the service life of the lightning protection device; finally, the suspension member 7 is connected to the fixing unit 3 connected to the ground anchor point through multiple adhesive components and connectors 4, which enhances the overall stability of the lightning protection device, helps to prevent the device from shifting or falling off under strong winds or lightning strikes, thereby ensuring the lightning protection effect.

[0033] like Figure 1 As shown, the lightning current receiving unit 8 includes a receiving end and a fixed end. The receiving end and the fixed end are an integrated structure, which improves the overall structural strength of the lightning current receiving unit 8. Under the impact of lightning, it can better withstand and disperse the mechanical stress generated by lightning, and reduce the risk of lightning protection failure caused by structural damage; the receiving end and the fixed end are axially perpendicular, so that the receiving end can face the direction of the lightning strike more directly, which helps to maximize the exposure area of ​​the receiving end, thereby improving the efficiency of receiving lightning current, and also helps to reduce the refraction and reflection of lightning during the receiving process, further ensuring the receiving effect. Finally, the fixed end is installed on the top of the suspension 7 for receiving lightning current. Specifically, the fixed end is an arc-shaped structure, and the fixed end is bonded to the top of the suspension 7. The arc-shaped structure can better adapt to the shape of the top of the suspension 7, ensure the flatness and tightness of the bonding surface, and improve the bonding strength, so that the connection between the fixed end and the suspension 7 is more firm and reliable. Secondly, the design of the arc structure makes the bonding surface smoother, reducing stress concentration caused by shape differences. The smooth bonding surface helps to evenly distribute the adhesive, improve the bonding quality, and better fill the tiny depressions or uneven areas on the top of the suspension 7, ensuring close contact between the bonding surfaces, and helping to prevent the adhesive from generating bubbles or gaps during the curing process, thereby improving the reliability and durability of the bonding. In addition, the firm connection and optimized bonding effect improve the overall structural strength between the fixed end and the suspension 7, helping to resist external stress and vibration, and extending the service life of the equipment.

[0034] like Figure 1 As shown, the lightning current receiving unit 8 is preferably a lightning arrester. During the use of this solution, it can efficiently capture lightning discharges and guide them to the subsequent lightning protection system, thereby effectively reducing the direct impact of lightning on wind power equipment. The guide wire 6 is preferably a flat copper wire with a soft material. On the one hand, it can effectively conduct lightning current from the receiving end to the grounding system to ensure the stability and efficiency of current transmission. On the other hand, the flat copper wire is soft and has good softness and toughness, so that the guide wire 6 can flexibly adapt to various shapes and angles during installation and layout, which is convenient for construction personnel to arrange and adjust according to the actual situation of the wind farm. At the same time, this softness also helps to reduce stress concentration caused by bending and extrusion, and extend the service life of the guide wire 6.

[0035] like Figure 2 As shown, the bonding assembly includes a first bonding member 5 and a second bonding member. The first bonding member 5 is bonded to the surface of the suspension member 7 , and the second bonding member is bonded to the first bonding member 5 and connected to the connecting member 4 .

[0036] During the bonding process, the first adhesive member 5 is preferably a sheet structure, and the second adhesive member is preferably an annular structure. The purpose is that the first adhesive member 5 with a sheet structure can better adapt to the surface of the suspension member 7 to ensure the firmness of the bonding; and the second adhesive member with an annular structure can not only be connected to the first adhesive member 5, but also be connected and fixed to the connecting member 4, effectively connecting the suspension member 7 to the ground.

[0037] like Figure 1 As shown, the suspension 7 is preferably a helium balloon. When used, the buoyancy of the helium balloon is used to float up to a certain spatial height, and the lightning current is received by the lightning current receiving unit 8, and the lightning current is converged to the grounding wire 2 at the bottom of the suspension 7 through the guide wire 6 arranged on the surface of the suspension 7, and then connected to the ground through the grounding wire 2. At the same time, three connecting pieces 4 are evenly arranged at 120 degrees at the lower part of the suspension 7. The three connecting pieces 4 can control the height of the suspension 7 and prevent position deviation. The lightning current receiving unit 8 is a lightning receiving device with a pointed top, which can form a distorted field strength within a certain spatial range, and has the highest position. It can receive lightning first when lightning occurs and introduce lightning current into the lightning current receiving unit 8. For the fixation with the suspension 7, it is necessary to select an adhesive suitable for metal and balloon materials, such as a strong double-sided adhesive or a professional balloon adhesive.

[0038] Since the suspension 7 provides overall buoyancy, the balloon membrane material can be nylon, PMMA (polymethyl methacrylate) and multi-layer membrane blended materials, etc. The main determining factor is that the buoyancy generated by the balloon should be greater than the sum of the gravity of the lightning current receiving unit 8, the guide wire 6, the grounding wire 2, the connector 4 and the suspension 7 membrane. That is:

[0039] In a second aspect, this embodiment provides a wind farm lightning protection method, the method is performed using the lightning protection device as described above, and comprises: S101. Install a lightning current receiving unit, a guide wire, an adhesive assembly and a grounding wire on the suspension member; illustratively, by arranging the suspension member 7 above the wind farm site, the lightning current receiving unit 8 on the top of the suspension member 7 is used to receive the current generated by lightning flashes and lightning, and transmit its current to the ground, thereby effectively avoiding the harm of lightning strikes; secondly, the guide wires 6 are arranged at intervals of forty-five degrees along the outer side of the suspension member 7, which helps to disperse the received lightning current more evenly in multiple directions, reduce local current density, reduce potential damage to the device structure caused by thermal effects and mechanical stress, and improve the service life of the lightning protection device; finally, the suspension member 7 is connected to the fixed unit connected to the ground anchor point through multiple adhesive assemblies and connectors 4, thereby enhancing the overall stability of the lightning protection device, helping to prevent the device from shifting or falling off under strong winds or lightning strikes, thereby ensuring the lightning protection effect.

[0040] S102, connect the suspension part to the grounding component through the grounding wire; illustratively, the suspension part 7 is connected to the grounding component 1 by the grounding wire, and the received lightning current can be smoothly passed into the underground to avoid the wind farm from being struck by lightning. At the same time, since the suspension part 7 is electrically isolated from the earth, static electricity is easily accumulated. When static electricity accumulates to a certain extent, static electricity discharge will occur, which may cause damage to the internal components of the equipment, and even produce arcing, endangering the safety of the operator. By connecting the suspension part 7 to the grounding component 1 through the grounding wire 2, the accumulated static electricity can be effectively introduced into the earth, thereby avoiding the harm caused by static electricity discharge. During the operation of the equipment, if the insulation between the suspension part 7 and the live parts is damaged, it may cause electric shock to the operator. Connecting the suspension part 7 and the grounding component 1 through the grounding wire 2 can provide a safe discharge path for the current, reducing the risk of electric shock to the operator.

[0041] S103. Install anchor points in the lightning protection area, and use connectors to fix the suspension to the anchor points; illustratively, by installing anchor points around the lightning protection area, the overall stability of the lightning protection device is enhanced, which helps prevent the device from shifting or falling off under strong winds or lightning strikes, thereby ensuring the lightning protection effect. In addition, it can ensure that lightning can be safely introduced into the earth along a predetermined path, on the one hand ensuring the integrity of the lightning protection system, and on the other hand avoiding damage to buildings or equipment. Secondly, when the grounding wire 2 needs to be inspected or replaced, it can be operated directly through the anchor points and connectors 4 without large-scale disassembly and reorganization of the entire system.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. A lightning protection device for a wind farm, characterized in that: include: A suspension member (7) on which a lightning current receiving unit (8) is provided; A guide line (6) is installed on the outside of the suspension member (7), and a plurality of guide lines (6) are arranged along the outside of the suspension member (7), and the angle difference between two adjacent guide lines (6) is forty-five degrees; A plurality of bonding assemblies are provided, one end of each of the bonding assemblies is connected to a suspension member (7), and the other end of each of the bonding assemblies is connected to a fixing unit (3) via a connecting member (4), wherein the fixing unit (3) is used to connect to a ground anchor point; A grounding wire (2) has one end connected to the suspension component (7) and the other end connected to the grounding component (1).

2. The lightning protection device according to claim 1, characterized in that: The lightning current receiving unit (8) comprises a receiving end and a fixed end, the receiving end and the fixed end are an integral structure, and the receiving end and the fixed end are axially perpendicular to each other; The fixed end is mounted on the top of the suspension member (7) and is used to receive lightning current.

3. The lightning protection device according to claim 2, characterized in that: The fixed end is an arc-shaped structure, and the fixed end is bonded to the top of the suspension member (7).

4. The lightning protection device according to claim 1 or 2, characterized in that: The lightning current receiving unit (8) is a lightning receptor.

5. The lightning protection device according to claim 1, characterized in that: The guide wire (6) is a flat copper wire made of soft material.

6. The lightning protection device according to claim 1, characterized in that: The bonding assembly comprises a first bonding member (5) and a second bonding member, wherein the first bonding member (5) is bonded to the surface of the suspension member (7), and the second bonding member is bonded to the first bonding member (5) and connected to the connecting member (4).

7. The lightning protection device according to claim 6, characterized in that: The first adhesive component (5) is a sheet-like structure.

8. The lightning protection device according to claim 6, characterized in that: The second adhesive member is an annular structure.

9. The lightning protection device according to claim 1, characterized in that: The suspension element (7) is a helium balloon.

10. A lightning protection method for a wind farm, characterized in that: The method is carried out using the lightning protection device according to any one of claims 1 to 9, comprising: Installing a lightning current receiving unit, a guide wire, a bonding assembly and a grounding wire on the suspension member; Connecting the suspension member to the grounding assembly via the grounding wire; Anchor points are installed in the lightning protection area, and the suspension parts are fixed to the anchor points by connecting parts.

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