Wind turbine and its blade, resistance detection method, storage medium and electronic device

Abstract

The present disclosure provides a wind turbine and its blade, a resistance detection method, a storage medium and an electronic device. The wind turbine blade includes a lightning receptor, a down conductor, a grounding device, a measuring cable and a resistance measuring device. The lightning receptor, the down conductor, the grounding device and the measuring cable are connected in series in sequence to form a closed loop; the resistance measuring device is electrically connected to the down conductor to form a first connection point, and the resistance measuring device is electrically connected to the measuring cable to form a second connection point; the first connection point and the second connection point divide the closed loop into a first half loop and a second half loop, the resistance of the first half loop is the first resistance, the resistance of the second half loop is the second resistance, and the total resistance is the parallel connection of the first resistance and the second resistance. In addition, the down conductor and the measuring cable are enclosed in an insulating device, which can effectively avoid insulation breakdown caused by the potential difference between the cables, weaken the electric field clustering effect between the two cables, and significantly reduce the probability of the blade being struck by lightning.

Description

Background Art

[0002] With the rapid development of the wind power industry, wind farms are distributed more and more widely, and the blades are gradually becoming larger, which makes the tower height and the rotor diameter increase. In order to ensure the safe operation of the lightning protection system, the blade factory usually formulates a series of inspection measures, among which the detection of the resistance of the lightning protection system has become an important means to test whether the lightning protection system is effective. The measured resistance value is compared with the threshold of the lightning protection system. When the resistance value is within the threshold range, the lightning protection system is in normal working condition. When the resistance value is not within the threshold range, it can be inferred that the lightning protection system has failed and needs to be repaired.

[0003] In the related art, two independent down conductors are often provided inside the blade, and the two ends of the two down conductors are electrically connected to the lightning arrester and the grounding device respectively. When measuring the resistance value, one end of one of the down conductors needs to be removed from the grounding device, so that the two measuring wires of the resistance measuring device are respectively connected to the removed down conductor and the unremoved down conductor, so that the resistance measuring device measures the resistance value of the two down conductors in series.

[0004] However, the above-mentioned structure of the wind turbine blade has the problem that each time the resistance value of the lightning protection system needs to be measured, a down conductor needs to be removed from the grounding device, which is a cumbersome and unsafe operation.

[0005] In addition, when measuring the resistance value, workers are required to use a crane to hoist the hanging basket at a height of several dozen meters, which not only consumes a lot of manpower and material resources, but also brings great safety hazards.

[0006] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art.

[0007] Public Content

[0008] The purpose of the present disclosure is to provide a wind turbine and its blades, a resistance detection method, a storage medium and an electronic device to solve the problem that the resistance measurement process in the above-mentioned related technologies is cumbersome and unsafe.

[0009] In order to achieve the above-mentioned disclosure purpose, the present disclosure adopts the following technical solutions:

[0010] According to one aspect of the present disclosure, there is provided a wind turbine blade, comprising a lightning receptor, a down conductor, a grounding device and a measuring cable, wherein the lightning receptor, the down conductor, the grounding device and the measuring cable are sequentially connected in series to form a closed loop;

[0011] It also includes a resistance measuring device, which is arranged in the root area of ​​the blade, and the resistance measuring device is electrically connected to the down conductor and the measuring cable respectively, so as to measure the total resistance of the closed loop;

[0012] The electrical connection between the resistance measuring device and the down conductor forms a first connection point, and the electrical connection between the resistance measuring device and the measuring cable forms a second connection point. The first connection point and the second connection point divide the closed loop into a first half loop and a second half loop. The resistance of the first half loop is a first resistance, and the resistance of the second half loop is a second resistance. The total resistance is equal to the first resistance and the second resistance in parallel.

[0013] According to an embodiment of the present disclosure, the positions of the first connection point and the second connection point are closer to the grounding device than to the lightning receptor.

[0014] According to an embodiment of the present disclosure, the connection between the down conductor and the grounding device forms the first connection point, and the connection between the measuring cable and the grounding device forms the second connection point.

[0015] According to an embodiment of the present disclosure, it further comprises an insulating device, in which the down conductor and the measuring cable are independently enclosed, and a minimum insulation distance is defined between the down conductor and the measuring cable.

[0016] According to one embodiment of the present disclosure, the minimum insulation distance is 5 mm to 20 mm.

[0017] According to one embodiment of the present disclosure, the cross-sectional area of ​​the down conductor and / or the measuring cable is 25 mm2 to 95 mm2.

[0018] According to an embodiment of the present disclosure, the cross-sectional areas of the down conductor and the measuring cable are equal.

[0019] According to an embodiment of the present disclosure, the insulating device includes an insulating material, and the insulating material includes at least one of the following:

[0020] Thermosetting polymers, thermoplastic polymers or composite materials.

[0021] According to one embodiment of the present disclosure, the insulating device includes an insulating material, and the insulation breakdown electric field strength exhibited by the insulating material is greater than 10kV.

[0022] According to one embodiment of the present disclosure, a branch line is further included, wherein the branch line is electrically connected to the down conductor, the measuring cable is insulated from the branch line, and the branch line is enclosed in the insulating device.

[0023] According to an embodiment of the present disclosure, a blade body lightning termination base is further included, wherein the blade body lightning termination base is electrically connected to the down conductor, and the measuring cable is insulated from the blade body lightning termination base.

[0024] According to another aspect of the present disclosure, a wind turbine is provided, comprising one or more wind turbine blades as described in any one of the above.

[0025] According to another aspect of the present disclosure, a method for detecting the safety of a lightning protection system of a wind turbine blade is provided, wherein the wind turbine blade is any one of the wind turbine blades described above, and the method comprises:

[0026] obtaining a resistance value detected by the resistance measuring device;

[0027] The resistance value is compared to a resistance threshold of the closed loop.

[0028] According to one embodiment of the present disclosure, the method further includes:

[0029] If the resistance value is greater than the resistance threshold, an alarm signal is sent to the terminal.

[0030] According to one embodiment of the present disclosure, the method further includes:

[0031] The resistance measuring device is controlled to be periodically disconnected from the closed loop.

[0032] According to another aspect of the present disclosure, a storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, any of the above-mentioned methods is implemented.

[0033] According to another aspect of the present disclosure, there is provided an electronic device, including:

[0034] Processor; and

[0035] A memory, configured to store executable instructions of the processor;

[0036] The processor is configured to perform any of the above methods by executing the executable instructions.

[0037] It can be seen from the above technical solutions that the advantages and positive effects of the wind turbine and its wind turbine blades disclosed in the present invention are:

[0038] In a wind turbine blade of an embodiment of the present disclosure, a resistance measuring device is arranged in the root area of ​​the blade and is electrically connected to the down conductor and the measuring cable respectively. Through such a structural design, the resistance measuring device can measure the resistance value of the lightning protection system in the wind turbine blade at any time without frequently disassembling the down conductor to be measured. In addition, the resistance value measured by the present disclosure is the total resistance after parallel connection, rather than the total resistance after series connection. When the lightning protection system fails and causes the total resistance to increase, the increase in the total resistance after parallel connection of the present disclosure will not be huge, so as to protect the resistance measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and other features and advantages of the present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0040] Figure 1A It is a cross-sectional view of a first embodiment of the insulation device of the present disclosure.

[0041] Figure 1B It is a cross-sectional view of a second embodiment of the insulation device of the present disclosure.

[0042] Figure 1C It is a cross-sectional view of a third embodiment of the insulation device of the present disclosure.

[0043] Figure 1D It is a cross-sectional view of a fourth embodiment of the insulation device of the present disclosure.

[0044] Figure 2 FIG. 4 is a schematic diagram showing the connection between a down conductor and a branch line according to an exemplary embodiment.

[0045] Figure 3 The figure is a schematic diagram showing the connection between the down conductor and the blade body lightning termination base according to an exemplary embodiment.

[0046] Figure 4 The figure is a schematic diagram showing the connection between the down conductor and the blade tip lightning termination base according to an exemplary embodiment.

[0047] Figure 5 FIG. 4 is a schematic diagram showing the connection between a down conductor and a grounding device according to an exemplary embodiment.

[0048] Figure 6 is a schematic diagram of a wind turbine blade shown according to an exemplary embodiment.

[0049] Figure 7 is a schematic diagram of a closed loop according to an exemplary embodiment.

[0050] Figure 8 is a schematic diagram of a storage medium according to an exemplary embodiment of the present disclosure.

[0051] Fig. 9 is a block diagram of an electronic device according to an exemplary embodiment of the present disclosure.

[0052] Fig.10 is a flow chart showing a detection method according to an exemplary embodiment of the present disclosure.

[0053] The reference numerals are described as follows:

[0054] 10a. Down conductor

[0055] 10b. Measurement cable

[0056] 101. First connection point

[0057] 102. Second connection point

[0058] 11. Lightning Terminal

[0059] 12. Resistance measuring device

[0060] 13. Closed Loop

[0061] 131. The first half of the circuit

[0062] 132. Second Half Circuit

[0063] 20. Insulation device

[0064] 21. Insulation layer

[0065] 30. Branch line

[0066] 31. Parallel clamp

[0067] 40. Blade body lightning arrester base

[0068] 50. Blade tip lightning arrester base

[0069] 51. Line nose

[0070] 52. Bolts

[0071] 60. Grounding device

[0072] R1, the first resistor

[0073] R2, the second resistor

[0074] d. Minimum insulation distance DETAILED DESCRIPTION

[0075] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0076] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the direction of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". The terms "one", "an", "the" and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to indicate open-ended inclusion and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc.; the terms "first", "second", "third" and "fourth" are used only as labels and are not quantitative limitations on their objects.

[0077] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0078] In conjunction with the accompanying drawings, the structures, connection methods and functional relationships of the main components of the specific implementation methods of the wind turbine and its wind turbine blades, detection methods, storage media and electronic equipment proposed in the present disclosure are described in detail below. In the absence of conflict, the features in the following embodiments may be combined with each other.

[0079] Wind turbine blade implementation

[0080] The present invention provides a wind turbine blade, comprising a lightning receptor, a down conductor, a grounding device and a measuring cable. The lightning receptor, the down conductor, the grounding device and the measuring cable are connected in series in sequence to form a closed loop.

[0081] It also includes a resistance measuring device, which is arranged in the root area of ​​the blade. The resistance measuring device is electrically connected to the down conductor and the measuring cable respectively to measure the total resistance of the closed loop.

[0082] Among them, the electrical connection between the resistance measuring device and the down conductor forms a first connection point, and the electrical connection between the resistance measuring device and the measuring cable forms a second connection point. The first connection point and the second connection point divide the closed loop into a first half loop and a second half loop. The resistance of the first half loop is the first resistance, and the resistance of the second half loop is the second resistance. The total resistance is equal to the parallel connection of the first resistance and the second resistance.

[0083] In a wind turbine blade of an embodiment of the present disclosure, a resistance measuring device is arranged in the root area of ​​the blade and is electrically connected to the down conductor and the measuring cable respectively. Through such a structural design, the resistance measuring device can measure the resistance value of the lightning protection system in the wind turbine blade at any time without frequently disassembling the down conductor to be measured. In addition, the resistance value measured by the present disclosure is the total resistance after parallel connection, rather than the total resistance after series connection. When the lightning protection system fails and causes the total resistance to increase, the increase in the total resistance after parallel connection of the present disclosure will not be huge, so as to protect the resistance measuring device.

[0084] The following is a description of a specific implementation method.

[0085] like Figure 6 As shown, the present disclosure provides a wind turbine blade, comprising a lightning receptor 11, a down conductor 10a, a grounding device and a measuring cable 10b, wherein the lightning receptor 11, the down conductor 10a, the grounding device and the measuring cable 10b are sequentially connected in series to form a closed loop 13. The lightning receptor 11 may be a blade tip lightning receptor 11 or a blade body lightning receptor 11.

[0086] It also includes a resistance measuring device 12 , which is arranged in the root area of ​​the blade. The resistance measuring device 12 is electrically connected to the down conductor 10 a and the measuring cable 10 b respectively, so as to measure the total resistance of the closed loop 13 .

[0087] Among them, the electrical connection between the resistance measuring device 12 and the down conductor 10a forms a first connection point 101, and the electrical connection between the resistance measuring device 12 and the measuring cable 10b forms a second connection point 102. The first connection point 101 and the second connection point 102 divide the closed loop 13 into a first half loop 131 and a second half loop 132. The resistance of the first half loop 131 is the first resistance, and the resistance of the second half loop 132 is the second resistance. The total resistance is equal to the parallel connection of the first resistance R1 and the second resistance R2.

[0088] In some embodiments, the first connection point 101 and the second connection point 102 are located closer to the grounding device than the lightning receptor 11 .

[0089] In this embodiment, by arranging the first connection point 101 and the second connection point 102 closer to the grounding device, it is possible to ensure that the measuring line extending from the resistance measuring device 12 is as short as possible, thereby reducing the probability of the resistance measuring device 12 being struck by lightning.

[0090] Of course, in order to further avoid the possibility of the resistance measuring device 12 being damaged by lightning, the resistance measuring device 12 may include a surge protector.

[0091] Furthermore, in some embodiments, the connection between the down conductor 10a and the grounding device forms a first connection point 101 , and the connection between the measuring cable 10b and the grounding device forms a second connection point 102 .

[0092] In this embodiment, if Figure 5 As shown, two measuring lines of the resistance measuring device 12 can be connected to the bolt positions of the grounding device respectively.

[0093] In addition, the inventors of the present disclosure have found in their research that the electric field clustering effect between the down conductor 10a and the measuring cable 10b will increase the electric field between the two cables, thereby greatly increasing the probability of being struck by lightning. In addition, the two cables will also cause insulation breakdown between the cables due to the passage of lightning current.

[0094] Therefore, the wind turbine blade of the present disclosure further comprises an insulating device, in which the down conductor 10a and the measuring cable 10b are independently enclosed, and a minimum insulation distance is defined between the down conductor 10a and the measuring cable 10b.

[0095] like Figures 1A to 1D As shown, schematic diagrams of four different implementations of the insulating device are respectively shown. Each cable is enclosed in the insulating device 20, and a minimum insulation distance d is defined between two adjacent cables. Since the insulating device 20 is provided between the two cables and the two cables are separated by a minimum insulation distance d, when the lightning current flows in the two cables, the insulating device 20 has defined the minimum insulation distance d between the two cables, so that the insulating device 20 can effectively avoid insulation breakdown caused by the potential difference between the two cables, and at the same time, it also weakens the electric field clustering effect between the two cables, thereby significantly reducing the probability of the blade being struck by lightning.

[0096] The two cables may be made of copper, aluminum alloy or other metal conductors.

[0097] Please continue reading Figure 1A In one embodiment, the cross-sectional view of the two cables enclosed in the insulating device 20 is a semicircle. When the down conductor is arranged inside the blade, the bottom surface of the semicircle can be connected to the web of the blade, for example by bonding, to improve the firmness of the down conductor connection.

[0098] like Figure 1B As shown, in some embodiments, the cross-sectional view of the two cables enclosed in the insulating device 20 is an ellipse.

[0099] like Figure 1C As shown, in some embodiments, the cross-sectional view of the two cables enclosed in the insulation device 20 is generally gourd-shaped.

[0100] like Figure 1D As shown, in some embodiments, the cross-sectional view of the two cables enclosed in the insulating device 20 is circular.

[0101] like Figures 1A to 1D As shown, in one embodiment, the minimum insulation distance d between two adjacent cables is 5 mm to 20 mm, for example, 6 mm, 7 mm, 8 mm, 10 mm, 11 mm, 15 mm, 17 mm, 19 mm, etc.

[0102] Of course, the higher the insulation grade of the insulating material used in the insulating device 20, the shorter the minimum insulation distance d that effectively prevents insulation breakdown between cables. The shorter minimum insulation distance d can make the down conductor 10a and the measuring cable 10b more compact and save the amount of insulating material.

[0103] In one embodiment, the cross-sectional area of ​​the cable may be 25 mm 2 Up to 95mm 2 , as a preferred embodiment, the cross-sectional area is 50mm 2 . Furthermore, in one embodiment, the cross-sectional area of ​​each cable is equal. When the lightning current flows in the cable, since the cross-sectional areas of the cables are equal, the current flowing through the two cables is basically the same, and there is basically no potential difference between the two cables. Therefore, through the above design, the probability of insulation breakdown between the cables is significantly reduced. In addition, the insulating device 20 between the two cables and the limited minimum insulation distance d significantly weaken the electric field clustering effect between the cables.

[0104] In one embodiment, the insulating device 20 is made of an insulating material, and the insulating material includes at least one of the following: a thermosetting polymer, a thermoplastic polymer, or a synthetic material, such as BMC, cross-linked polyethylene, polyurethane, epoxy resin, and the like.

[0105] According to alternative embodiments, the insulating device 20 includes other insulating materials or compounds. These other insulating materials include ceramic materials, porcelain, glass, plastics, polymer plastics, rubber or a combination thereof. In some embodiments, the benefit is that different insulating materials are combined to form a composite material. However, in other embodiments, the insulating device 20 can be formed by several insulating parts, and the insulating parts are formed by different insulating materials. In the illustrated embodiment, the insulating device 20 can, for example, include several parts formed by glass or porcelain and connected by plastic or rubber materials.

[0106] In one embodiment, the insulating device 20 includes an insulating material, and the insulating material exhibits a dielectric breakdown electric field strength of at least 10 kV, such as 12 kV, 15 kV, 20 kV, etc.

[0107] The insulating device 20 includes an insulating material with a relatively strong insulation breakdown electric field strength, which can make the above-mentioned minimum insulation distance d relatively small, thereby correspondingly reducing the amount of insulating material used.

[0108] like Figure 2 As shown, in one embodiment, the wind turbine blade further includes a branch line 30, and the branch line 30 is used to connect the blade body lightning receptor and the blade body lightning receptor base 40. The branch line 30 is electrically connected to the down conductor 10a, and the measuring cable 10b is insulated from the branch line 30, and the branch line 30 is enclosed in the insulating device 20. Specifically, the branch line 30 and the down conductor 10a are electrically connected through a parallel clamp 31, such as a C-type clamp, an HC-type clamp, etc., and the outer periphery of the branch line 30, the down conductor 10a and the parallel clamp 31 is coated with an insulating layer 21. The insulating layer 21 can be coated on the outer periphery by processes such as die casting, injection molding, perfusion, and coating. The material of the insulating layer 21 can be BMC, cross-linked polyethylene, polyurethane, epoxy resin, etc.

[0109] like Figure 3 As shown, in one embodiment, the wind turbine blade further comprises a blade body lightning termination base 40, and the blade body lightning termination base 40 is used to connect the blade body lightning termination. The down conductor 10a passes through the blade body lightning termination base 40 and is electrically connected to the blade body lightning termination base 40, the measuring cable 10b is insulated from the blade body lightning termination base 40, and the embedded part of the blade body lightning termination base 40 is enclosed in the insulating device 20.

[0110] like Figure 4 As shown, in one embodiment, the down conductor 10a and the measuring cable 10b are connected to the blade tip lightning termination base 50 via two line noses 51 respectively, and the line noses 51 are fixed to the blade tip lightning termination base 50 via bolts 52.

[0111] In addition, the embedded part of the blade tip lightning termination base 50 and the connection area between the down conductor 10a and the measuring cable 10b are wrapped with an insulating layer 21 to prevent the electric field clustering effect caused between the cables.

[0112] Of course, in other embodiments, the down conductor 10a and the measuring cable 10b may also be connected to the blade tip lightning arrester base 50 by means of crimping or wiring terminals, which will not be described in detail here.

[0113] like Figure 5 As shown, in one embodiment, two cables are detachably connected to the grounding device 60 by means of bolts 52 and wire noses 51 to perform resistance measurement.

[0114] Of course, in other embodiments, other detachable methods may be used to connect to the grounding device 60, such as crimping, wiring terminals, etc.

[0115] Wind turbine implementation

[0116] An embodiment of the present disclosure provides a wind turbine, comprising one or more wind turbine blades as described above.

[0117] During the use of the wind turbine disclosed in the present invention, the resistance measuring device can measure the resistance value of the lightning protection system in the wind turbine blade at any time without frequently disassembling the down conductor to be measured. In addition, the resistance value measured by the present invention is the total resistance after parallel connection, rather than the total resistance after series connection. When the lightning protection system fails and causes the total resistance to increase, the increase in the total resistance after parallel connection of the present invention will not be huge, so as to protect the resistance measuring device.

[0118] In addition, without reducing the reliability of the lightning protection system, the wind turbine operates stably. Compared with the wind turbine in the prior art, the wind turbine disclosed in the present invention can effectively reduce the probability of being struck by lightning and significantly improve the service life.

[0119] Detection method implementation method

[0120] An embodiment of the present disclosure provides a method for detecting the safety of a lightning protection system of a wind turbine blade, wherein the wind turbine blade comprises a lightning receptor 11, a down conductor 10a, a grounding device and a measuring cable 10b, wherein the lightning receptor 11, the down conductor 10a, the grounding device and the measuring cable 10b are sequentially connected in series to form a closed loop 13. The lightning receptor 11 may be a blade tip lightning receptor 11 or a blade body lightning receptor 11.

[0121] It also includes a resistance measuring device 12 , which is arranged in the root area of ​​the blade. The resistance measuring device 12 is electrically connected to the down conductor 10 a and the measuring cable 10 b respectively, so as to measure the total resistance of the closed loop 13 .

[0122] Among them, the electrical connection between the resistance measuring device 12 and the down conductor 10a forms a first connection point 101, and the electrical connection between the resistance measuring device 12 and the measuring cable 10b forms a second connection point 102. The first connection point 101 and the second connection point 102 divide the closed loop 13 into a first half loop 131 and a second half loop 132. The resistance of the first half loop 131 is the first resistance, and the resistance of the second half loop 132 is the second resistance. The total resistance is equal to the parallel connection of the first resistance R1 and the second resistance R2.

[0123] The method for detecting the safety of a wind turbine blade lightning protection system comprises:

[0124] Step S910: obtaining the resistance value detected by the resistance measuring device;

[0125] Step S920: Compare the resistance value with the resistance threshold of the closed loop.

[0126] In the disclosed embodiment, a system database may be pre-established, in which the resistance threshold of the closed loop is stored. After obtaining the resistance value detected by the resistance measuring device, the resistance value is compared with the resistance threshold to determine whether the wind turbine blade lightning protection system is in a safe and effective state.

[0127] In one embodiment, the method further includes: if the resistance value is greater than the resistance threshold, sending an alarm signal to a terminal.

[0128] In the embodiment of the present disclosure, the resistance value detected by the resistance measuring device 12 is the resistance value of the first half loop 131 and the second half loop 132, that is, the parallel connection of the first resistor R1 and the second resistor R2. When the resistance value is greater than the resistance threshold, it means that there is a problem in the closed loop in the wind turbine blade lightning protection system, and an alarm signal is sent to the terminal.

[0129] In another embodiment, the terminal can be a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, a laptop computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), etc. The embodiment of the present application does not impose any restrictions on the specific type of the terminal.

[0130] In an exemplary embodiment, the method further includes: controlling the resistance measuring device to be periodically disconnected from the closed loop.

[0131] In the disclosed embodiment, the detection cycle of the resistance measuring device is set to control the connection or disconnection of the resistance measuring device and the closed loop. In actual operation, it is not necessary to always obtain the resistance value of the resistance measuring device. The resistance measuring device can be configured to be in a silent state or a working state. In the working state, the resistance measuring device measures the resistance of the closed loop, and in the silent state, the resistance measuring device is disconnected from the closed loop. In this way, the resistance measuring device is protected from lightning damage and electric energy is saved.

[0132] Storage medium implementation

[0133] In an exemplary embodiment of the present disclosure, a computer-readable storage medium is also provided, on which a program product capable of implementing the above method of the present specification is stored. In some possible implementations, various aspects of the present disclosure may also be implemented in the form of a program product, which includes a program code, and when the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps according to various exemplary implementations of the present disclosure described in the above "Exemplary Method" section of the present specification.

[0134] refer to Figure 8 As shown, a program product 1000 for implementing the above method according to an embodiment of the present disclosure is described, which can adopt a portable compact disk read-only memory (CD-ROM) and include program code, and can be run on a terminal device, such as a personal computer. However, the program product of the present disclosure is not limited thereto. In this document, a readable storage medium can be any tangible medium containing or storing a program, which can be used by or in combination with an instruction execution system, an apparatus or a device.

[0135] The program product may use any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0136] Computer readable signal media may include data signals propagated in baseband or as part of a carrier wave, in which readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Readable signal media may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0137] The program code embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the foregoing.

[0138] Program code for performing the operations of the present disclosure may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., through the Internet using an Internet service provider).

[0139] Electronic device implementation

[0140] Those skilled in the art will appreciate that various aspects of the present disclosure may be implemented as systems, methods or program products. Therefore, various aspects of the present disclosure may be specifically implemented in the following forms, namely: complete hardware implementation, complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software, which may be collectively referred to herein as "circuits", "modules" or "systems".

[0141] Refer to the following Fig. 9 1100 according to this embodiment of the present disclosure is described. Fig. 9 The electronic device 1100 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0142] like Fig. 9As shown, the electronic device 1100 is in the form of a general computing device. The components of the electronic device 1100 may include, but are not limited to: the at least one processing unit 1110, the at least one storage unit 1120, a bus 1130 connecting different system components (including the storage unit 1120 and the processing unit 1110), and a display unit 1140.

[0143] The storage unit stores a program code, which can be executed by the processing unit 1110, so that the processing unit 1110 performs the steps described in the "Exemplary Method" section of the present specification according to various exemplary embodiments of the present disclosure. For example, the processing unit 1110 can perform the following steps: Fig.10 Step S910 shown in the figure: obtaining the resistance value detected by the resistance measuring device; Step S920: comparing the resistance value with the resistance threshold of the closed loop.

[0144] The storage unit 1120 may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 11201 and / or a cache storage unit 11202 , and may further include a read-only storage unit (ROM) 11203 .

[0145] The storage unit 1120 may also include a program / utility 11204 having a set (at least one) of program modules 11205, such program modules 11205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0146] Bus 1130 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0147] The electronic device 1100 may also communicate with one or more external devices 1200 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 1100, and / or communicate with any device that enables the electronic device 1100 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 1150. Furthermore, the electronic device 1100 may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter 1160. As shown, the network adapter 1160 communicates with other modules of the electronic device 1100 via a bus 1130. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 1100, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0148] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the implementation of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the implementation of the present disclosure.

[0149] It should be noted here that the wind turbine and its wind turbine blade shown in the drawings and described in this specification are only one example of the principle of the present disclosure. It should be clearly understood by those skilled in the art that the principle of the present disclosure is not limited to any details or any components of the device shown in the drawings or described in the specification.

[0150] In summary, the advantages and beneficial effects of the wind turbine and the wind turbine blades disclosed herein are:

[0151] In a wind turbine blade of an embodiment of the present disclosure, a resistance measuring device is arranged in the root area of ​​the blade and is electrically connected to the down conductor and the measuring cable respectively. Through such a structural design, the resistance measuring device can measure the resistance value of the lightning protection system in the wind turbine blade at any time without frequently disassembling the down conductor to be measured. In addition, the resistance value measured by the present disclosure is the total resistance after parallel connection, rather than the total resistance after series connection. When the lightning protection system fails and causes the total resistance to increase, the increase in the total resistance after parallel connection of the present disclosure will not be huge, so as to protect the resistance measuring device.

[0152] It should be understood that the present disclosure does not limit its application to the detailed structure and arrangement of the components proposed in this specification. The present disclosure can have other embodiments and can be implemented and executed in a variety of ways. The aforementioned variations and modifications fall within the scope of the present disclosure. It should be understood that the present disclosure disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned or evident in the text and / or the drawings. All these different combinations constitute multiple alternative aspects of the present disclosure. The embodiments described in this specification illustrate the best mode known for implementing the present disclosure and will enable those skilled in the art to utilize the present disclosure.

Claims

1. A wind turbine blade, characterized in that: It comprises a lightning rod, a down conductor, a grounding device and a measuring cable, wherein the lightning rod, the down conductor, the grounding device and the measuring cable are connected in series in sequence to form a closed loop; It also includes a resistance measuring device, which is arranged in the root area of ​​the blade, and the resistance measuring device is electrically connected to the down conductor and the measuring cable respectively, so as to measure the total resistance of the closed loop; Wherein, the electrical connection between the resistance measuring device and the down conductor forms a first connection point, and the electrical connection between the resistance measuring device and the measuring cable forms a second connection point, the first connection point and the second connection point divide the closed loop into a first half loop and a second half loop, the resistance of the first half loop is a first resistance, the resistance of the second half loop is a second resistance, and the total resistance is equal to the parallel connection of the first resistance and the second resistance; The first connection point and the second connection point are located closer to the grounding device than the lightning receptor; The connection between the down conductor and the grounding device forms the first connection point, and the connection between the measuring cable and the grounding device forms the second connection point; an insulating device, in which the down conductor and the measuring cable are independently enclosed, defining a minimum insulation distance between the down conductor and the measuring cable; The minimum insulation distance is 5 mm to 20 mm; and the cross-sectional area of ​​the down conductor and / or the measuring cable is 25 mm 2 Up to 95mm 2 .

2. The wind turbine blade according to claim 1, characterized in that The cross-sectional areas of the down conductor and the measuring cable are equal.

3. The wind turbine blade according to claim 1, characterized in that The insulating device includes an insulating material, and the insulating material includes at least one of the following: a thermosetting polymer, a thermoplastic polymer, or a composite material.

4. The wind turbine blade according to claim 1, characterized in that The insulating device comprises an insulating material, and the insulating material exhibits an insulation breakdown electric field strength greater than 10 kV.

5. The wind turbine blade according to claim 1, characterized in that It also includes a branch line, which is electrically connected to the down conductor, the measuring cable is insulated from the branch line, and the branch line is enclosed in the insulating device.

6. The wind turbine blade according to claim 1, characterized in that It also includes a blade body lightning termination base, the blade body lightning termination base is electrically connected to the down conductor, and the measuring cable is insulated from the blade body lightning termination base.

7. A wind turbine, characterized in that: Comprising one or more wind turbine blades according to any one of claims 1 to 6.

8. A method for detecting the safety of a lightning protection system for a wind turbine blade, characterized in that: The wind turbine blade is a wind turbine blade according to any one of claims 1 to 6, and the method comprises: obtaining a resistance value detected by the resistance measuring device; The resistance value is compared to a resistance threshold of the closed loop.

9. The method for detecting the safety of a wind turbine blade lightning protection system according to claim 8, characterized in that: The method further comprises: If the resistance value is greater than the resistance threshold, an alarm signal is sent to the terminal.

10. The method for detecting the safety of a wind turbine blade lightning protection system according to claim 8, characterized in that: The method further comprises: The resistance measuring device is controlled to be periodically disconnected from the closed loop.

11. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 8 to 10 is implemented.

12. An electronic device, characterized in that: include: processor; as well as A memory, configured to store executable instructions of the processor; The processor is configured to perform the method of any one of claims 8 to 10 by executing the executable instructions.

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