Fan blade lightning protection grounding loop resistance measuring system and method

Abstract

The invention discloses a fan blade lightning protection grounding loop resistance measurement system and method. The system comprises an unmanned aerial vehicle resistance measurement system, a conductive sucker, a test lead and a direct current resistance tester. The unmanned aerial vehicle resistance measuring system comprises an unmanned aerial vehicle hanging bracket, an unmanned aerial vehicle, an unmanned aerial vehicle camera, an air pump, a control system and a conductive suction cup hanging bracket. The unmanned aerial vehicle hanging bracket is fixed to the bottom of an unmanned aerial vehicle, the unmanned aerial vehicle camera, the air pump and the control system are fixed to the unmanned aerial vehicle hanging bracket, the upper end of the conductive suction cup hanging bracket is fixed to the unmanned aerial vehicle hanging bracket, the conductive suction cup is fixed to the conductive suction cup hanging bracket, and the air pump and the control system are connected with the conductive suction cup. According to the system and the method, the problem that the resistance of the lightning protection grounding loop of the blade of the wind turbine generator cannot be directly detected in the installation process and the operation and maintenance process can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power, and relates to a system and method for measuring the lightning protection grounding loop resistance of a wind turbine blade. Background Art

[0002] With the development and maturity of our wind power technology, my country has planned a large number of wind power bases on land and in coastal areas. Lightning is one of the most important natural disasters that cause damage to wind turbines. Relevant research data shows that wind turbine blade damage accounts for about 20%-28% of the total, and electromechanical control systems account for about 70.5%-71%.

[0003] Wind turbines are usually installed in areas with high geographical locations. Due to the lack of other tall objects around them, they are more likely to attract lightning. The size of the lightning protection grounding resistance of the wind turbine is directly related to the safe and stable operation of the wind turbine. The wind turbine blades are the most vulnerable parts of the wind turbine. Its good lightning protection design is the decisive factor in ensuring the continuous and stable operation of the wind turbine. When lightning strikes, it is received by the lightning rod, then transmitted to the main engine downconductor system through the blade downconductor system, and finally guided into the ground.

[0004] Since the wind turbine is about 100 meters above the ground and the blade tip is close to 100 meters from the nacelle, the grounding resistance of the lightning protection grounding circuit cannot be directly measured after the wind turbine is installed. At present, the grounding inspection of the grounding resistance of the lightning protection grounding circuit of the wind turbine is a segmented inspection. That is: (1) The resistance measurement between the blade lightning receptor and the blade root flange is to check whether the blade lightning protection down conductor connection is intact and whether the lightning protection down conductor section is damaged before the blade is hoisted, and to detect the DC resistance between the blade lightning receptor and the blade root flange. (2) The resistance measurement between the variable pitch bearing and the tower grounding electrode is to check the integrity of the lightning discharge device (carbon brush, slip ring, discharge gap, etc.) on the variable pitch bearing, main bearing, and yaw bearing before and after the unit is hoisted, and confirm that the tower jumper connection is reliable. Moreover, the grounding resistance of the lightning protection grounding circuit cannot be directly detected after the wind turbine is in operation. To this end, a wind turbine blade lightning protection grounding circuit resistance measurement system and method are proposed. The method directly detects the grounding resistance of the wind turbine blade lightning protection grounding circuit to ensure the safe and stable operation of the wind turbine. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a wind turbine blade lightning protection grounding loop resistance measurement system and method. The system and method can solve the problem that the lightning protection grounding loop resistance of the wind turbine blade cannot be directly detected during the installation and operation and maintenance process.

[0006] To achieve the above-mentioned purpose, a wind turbine blade lightning protection grounding loop resistance measurement system described in the present invention includes a drone resistance measurement system, a conductive suction cup, a test lead and a direct resistance tester; the drone resistance measurement system includes a drone hanger, a drone, a drone camera, an air pump and a control system and a conductive suction cup hanger;

[0007] The drone hanger is fixed to the bottom of the drone, the drone camera, air pump and control system are fixed on the drone hanger, the upper end of the conductive suction cup hanger is fixed on the drone hanger, the conductive suction cup is fixed on the conductive suction cup hanger, the air pump and control system are connected to the conductive suction cup, and the conductive suction cup is connected to the direct resistance tester via a test lead.

[0008] The wind turbine blade lightning protection grounding loop resistance measurement system of the present invention is further improved in that:

[0009] Furthermore, the conductive suction cup includes a suction cup body, a lead-out terminal and an air duct, the suction cup body includes a suction cup bottom plate and a suction cup skirt arranged on the outside of the suction cup bottom plate, the outer end surface of the suction cup bottom plate is connected to the suction cup skirt, a conductive ring is arranged on the front of the suction cup bottom plate, the lead-out terminal passes through the suction cup bottom plate and is connected to the conductive ring, one end of the air duct passes through the suction cup bottom plate, the air duct is connected to the conductive suction cup hanger, the other end of the air duct is connected to the air pump and the control system, and the lead-out terminal is connected to the test lead.

[0010] Furthermore, a lighting hole and a camera hole are provided on the suction cup bottom plate, a lighting lamp is installed in the lighting hole, and a camera is installed in the camera hole.

[0011] Furthermore, the conductive ring is sleeved on the air guide tube.

[0012] Furthermore, the lighting holes and the camera holes are on the same circumference, and the lighting holes and the camera holes are staggered in sequence, and the lighting holes and the camera holes are evenly distributed along the circumference.

[0013] Furthermore, the end surface of the conductive ring is higher than the suction cup support bar and the air guide tube.

[0014] Furthermore, the suction cup body is made of soft rubber integrally cast.

[0015] Furthermore, a valve is provided on the air guide tube, and a control end of the valve is connected to the air pump and the control system.

[0016] Furthermore, the conductive ring and the lead-out terminal are made of copper conductive material;

[0017] Furthermore, the air duct is made of insulating material.

[0018] The method for measuring the lightning protection grounding loop resistance of a wind turbine blade according to the present invention comprises the following steps:

[0019] Control the drone to stop it on the upper side of the blade under test, check the position of the blade lightning receptor through the drone camera, and control the drone to make the blade lightning receptor face the conductive ring. Then control the drone to make the conductive suction cup stick to the blade lightning receptor, start the air pump and control system, and suck air through the air duct to make the conductive suction cup tightly connected to the blade lightning receptor. Then measure the lightning protection grounding loop resistance of the blade through the direct resistance tester, test leads, the conductive ring and lead-out terminal on the conductive suction cup, the lead between the blade lightning receptor and the blade root flange, and the grounding down lead between the pitch bearing and the tower grounding electrode.

[0020] The present invention has the following beneficial effects:

[0021] During specific operation, the wind turbine blade lightning protection grounding loop resistance measurement system and method described in the present invention controls the drone so that the lightning receptor of the blade to be measured is directly opposite to the conductive ring, then controls the drone so that the conductive suction cup is attached to the lightning receptor of the blade to be measured, and starts the air pump and the control system to draw air through the air duct so that the conductive suction cup is tightly connected to the blade lightning receptor, and then the lightning protection grounding loop resistance of the blade is measured through a direct resistance tester, a test lead, a conductive ring and a lead-out terminal on the conductive suction cup, a lead between the blade lightning receptor and the blade root flange, and a grounding down conductor between the pitch bearing and the tower grounding electrode, so as to solve the problem that the lightning protection grounding loop resistance of the wind turbine blade cannot be directly detected during the installation process and the operation and maintenance process.

[0022] Furthermore, the lighting lamps and cameras are evenly distributed on the same circumference, which is conducive to the alignment of the blade lightning receptors and the conductive rings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 It is a structural diagram of the present invention.

[0025] Figure 2 This is a schematic diagram of the lightning protection grounding circuit of the blades of wind turbine 1;

[0026] Figure 3 It is a schematic diagram of the UAV resistance measurement system 2;

[0027] Figure 4 is a schematic diagram of a conductive suction cup 3;

[0028] Figure 5 It is a schematic cross-sectional view of the conductive suction cup 3.

[0029] Among them, 1 is a wind turbine set, 101 is a wind turbine tower, 102 is a blade, 103 is a hub, 104 is a grounding down conductor from a pitch bearing to a tower grounding electrode, 105 is a lead from a blade lightning receptor to a blade root flange, 106 is a blade lightning receptor, 2 is a UAV resistance measurement system, 201 is a UAV, 202 is a UAV hanger, 203 is a UAV camera, 204 is an air pump and control system, 205 is a conductive suction cup hanger, 206 is a valve, 207 is an air guide tube, 3 is a conductive suction cup, 301 is a suction cup bottom plate, 302 is a suction cup skirt, 303 is a suction cup support bar, 304 is a lighting lamp, 305 is a camera, 306 is a conductive ring, 307 is a lead-out terminal, 4 is a test lead, and 5 is a direct resistance tester. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. 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.

[0031] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0033] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0034] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0035] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0036] 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, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0038] Since the wind turbine 1 is about 100 meters above the ground, and the blade tip is also close to 100 meters from the nacelle, the grounding resistance of the lightning protection grounding circuit cannot be directly measured after the wind turbine 1 is installed. At present, the grounding inspection of the grounding resistance of the lightning protection grounding circuit of the wind turbine 1 is a segmented inspection. That is, the resistance measurement between the blade lightning receptor 106 and the blade root flange is before the blade 102 is hoisted, to check whether the lightning protection down conductor connection of the blade 102 is intact, whether the lightning protection down conductor cross section is damaged, and to detect the DC resistance between the blade lightning receptor 106 and the blade root flange. The resistance measurement between the variable pitch bearing and the tower grounding electrode is to check the integrity of the lightning discharge device (carbon brush, slip ring, discharge gap, etc.) on the variable pitch bearing, main bearing, and yaw bearing before and after the unit is hoisted, and confirm that the tower jumper connection is reliable. Moreover, the grounding resistance of the lightning protection grounding circuit of the wind turbine 1 cannot be directly detected after the operation of the wind turbine 1. To this end, a wind turbine blade lightning protection grounding loop resistance measurement system and method are proposed, by which the grounding resistance of the wind turbine blade lightning protection grounding loop is directly detected to ensure the safe and stable operation of the wind turbine 1.

[0039] Embodiment 1

[0040] refer to Figures 1 to 5 The wind turbine blade lightning protection grounding loop resistance measurement system of the present invention includes a wind turbine set 1, an unmanned aerial vehicle resistance measurement system 2, a conductive suction cup 3, a test lead 4 and a direct resistance tester 5.

[0041] The wind turbine 1 comprises a wind turbine blade lightning protection grounding loop resistor, a wind turbine tower 101, blades 102 and a hub 103, wherein the blades 102 are mounted on the top of the wind turbine tower 101 through the hub 103 and the pitch bearing.

[0042] The wind turbine blade lightning protection grounding loop resistor comprises a grounding down conductor 104 between the pitch bearing and the tower grounding electrode, a conductor 105 between the blade lightning receptor and the blade root flange, and a plurality of blade lightning receptors 106, wherein each blade lightning receptor 106 is installed on the blade.

[0043] The UAV resistance measurement system 2 includes a UAV 201, a UAV hanger 202, a UAV camera 203, an air pump and control system 204, a conductive suction cup hanger 205 and a conductive suction cup 3. The UAV hanger 202 is fixed to the bottom of the UAV 201, the UAV camera 203 and the air pump and control system 204 are fixed to the UAV hanger 202, the upper end of the conductive suction cup hanger 205 is fixed to the UAV hanger 202, the conductive suction cup 3 is fixed to the conductive suction cup hanger 205, and the air pump and control system 204 is connected to the conductive suction cup 3.

[0044] refer to Figure 4 and Figure 5The conductive suction cup 3 includes a suction cup body, which includes a suction cup bottom plate 301 and a suction cup skirt 302 arranged outside the suction cup bottom plate 301. The outer end surface of the suction cup bottom plate 301 is connected to the suction cup skirt 302. A conductive ring 306 is arranged on the front of the suction cup bottom plate 301. The lead-out terminal 307 passes through the suction cup bottom plate 301 and is connected to the conductive ring 306. One end of the air guide tube 207 passes through the suction cup bottom plate 301. The air guide tube 207 is connected to the conductive suction cup hanger 205. The other end of the air guide tube 207 is connected to the air pump and control system 204. The suction cup bottom plate 301 is provided with a lighting hole and a camera hole. A lighting lamp 304 is installed in the lighting hole, and a camera 305 is installed in the camera hole. The direct resistance tester 5 is connected to the lead-out terminal 307 through the test lead 4.

[0045] As an implementation mode of the present invention, the conductive ring 306 is sleeved on the air guide tube 207 .

[0046] As an implementation manner of the present invention, the lighting holes and the camera holes are on the same circumference, and the lighting holes and the camera holes are staggered in sequence, and the lighting holes and the camera holes are evenly distributed along the circumference.

[0047] As an implementation mode of the present invention, the end surface of the conductive ring 306 is higher than the suction cup support bar 303 and the air guide tube 207 .

[0048] As an implementation manner of the present invention, the suction cup body is made of soft rubber in an integrated casting manner.

[0049] As an implementation mode of the present invention, the conductive ring 306 and the lead terminal 307 are made of copper conductive material.

[0050] As an embodiment of the present invention, the air duct 207 is made of a solid insulating material.

[0051] As an implementation mode of the present invention, a valve 206 is provided on the air guide tube 207 , and a control end of the valve 206 is connected to the air pump and control system 204 .

[0052] As an embodiment of the present invention, the air duct 207 is a telescopic structure, which is conducive to keeping the blades 102 away from the drone 201 and ensuring the safety of the wind turbine equipment and the drone 201.

[0053] Embodiment 2

[0054] refer to Figures 1 to 5The present embodiment discloses a method for measuring the lightning protection grounding loop resistance of a wind turbine blade. The method is implemented based on a wind turbine blade lightning protection grounding loop resistance measurement system. The wind turbine blade lightning protection grounding loop resistance measurement system includes a drone resistance measurement system 2, a conductive suction cup 3, a test lead 4 and a direct resistance tester 5; the drone resistance measurement system 2 includes a drone hanger 202, a drone 201, a drone camera 203, an air pump and control system 204 and a conductive suction cup hanger 205; the drone hanger 202 is fixed to the bottom of the drone 201, the drone camera 203 and the air pump and control system 204 are fixed to the drone hanger 202, the upper end of the conductive suction cup hanger 205 is fixed to the drone hanger 202, the conductive suction cup 3 is fixed to the conductive suction cup hanger 205, the air pump and control system 204 are connected to the conductive suction cup 3, and the conductive suction cup 3 is connected to the direct resistance tester 5 via the test lead 4; the conductive suction cup 3 includes a suction cup body, a lead-out terminal 307 and an air duct 207, the suction cup body includes a suction cup base plate 301 and a suction cup skirt 302 arranged on the outside of the suction cup base plate 301, the outer end surface of the suction cup base plate 301 is connected to the suction cup skirt 302, a conductive ring 306 is arranged on the front of the suction cup base plate 301, the lead-out terminal 307 passes through the suction cup base plate 301 and is connected to the conductive ring 306, one end of the air duct 207 passes through the suction cup base plate 301, the air duct 207 is connected to the conductive suction cup hanger 205, the other end of the air duct 207 is connected to the air pump and control system 204, and the lead-out terminal 307 is connected to the test lead 4.

[0055] Specifically, the wind turbine blade lightning protection grounding loop resistance measurement method comprises the following steps:

[0056] Before the test, the test personnel stopped the wind turbine and stopped the blade 102 under test in a horizontal position, turned on the lighting 304, controlled the drone 201, stopped the drone 201 on the upper side of the blade 102 under test, checked the position of the blade lightning receptor 106 through the drone camera 203 and the camera 305, and controlled the drone 201 to make the blade lightning receptor 106 under test face the conductive ring 306, then controlled the drone 201 to make the conductive suction cup 3 attached to the blade lightning receptor 106 under test, opened the valve 206 through the air pump and the control system 204, and sucked air through the air duct 207, so that the conductive suction cup 3 was tightly connected to the blade lightning receptor 106, and then the lightning protection grounding loop resistance of the blade 102 can be measured through the direct resistance tester 5, the test lead 4, the conductive ring 306 and the lead-out terminal 307 on the conductive suction cup 3, the lead 105 between the blade lightning receptor and the blade root flange, and the grounding down conductor 104 between the pitch bearing and the tower grounding electrode.

[0057] The present invention has the following characteristics:

[0058] In the present invention, the conductive suction cup 3, the valve 206 and the air guide tube 207 are arranged symmetrically on both sides, which can effectively control the center of gravity of the device to remain vertical to the drone 201, thereby ensuring the stability of the drone 201 during hovering.

[0059] In the present invention, the air guide 207 is retractable, which is conducive to keeping the blades 102 and the drone 201 at a distance, thereby ensuring the safety of the wind turbine equipment and the drone 201.

[0060] In the present invention, the lighting lamp 304 and the camera 305 are evenly distributed on the same circumference, which is conducive to the alignment of the blade lightning receptor 106 and the conductive ring 306.

[0061] The present invention can realize direct detection of the grounding resistance of the blade lightning protection grounding loop, thereby ensuring the safe and stable operation of the wind turbine set 1.

[0062] The present invention can be used not only in the construction period but also in the operation and maintenance period, and can effectively detect the grounding resistance anomaly of the blade lightning protection grounding loop.

[0063] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0064] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0065] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A wind turbine blade lightning protection grounding loop resistance measurement system, characterized in that: It comprises an unmanned aerial vehicle resistance measurement system (2), a conductive suction cup (3), a test lead (4) and a direct resistance tester (5); the unmanned aerial vehicle resistance measurement system (2) comprises an unmanned aerial vehicle hanger (202), an unmanned aerial vehicle (201), an unmanned aerial vehicle camera (203), an air pump and control system (204) and a conductive suction cup hanger (205); The drone hanger (202) is fixed to the bottom of the drone (201); the drone camera (203) and the air pump and control system (204) are fixed to the drone hanger (202); the upper end of the conductive suction cup hanger (205) is fixed to the drone hanger (202); the conductive suction cup (3) is fixed to the conductive suction cup hanger (205); the air pump and control system (204) are connected to the conductive suction cup (3); and the conductive suction cup (3) is connected to a direct resistance tester (5) via a test lead (4).

2. The wind turbine blade lightning protection grounding loop resistance measurement system according to claim 1 is characterized in that: The conductive suction cup (3) comprises a suction cup body, a lead terminal (307) and an air guide tube (207); the suction cup body comprises a suction cup bottom plate (301) and a suction cup skirt (302) arranged outside the suction cup bottom plate (301); the outer end surface of the suction cup bottom plate (301) is connected to the suction cup skirt (302); a conductive ring (306) is arranged on the front of the suction cup bottom plate (301); the lead terminal (307) passes through the suction cup bottom plate (301) and is connected to the conductive ring (306); one end of the air guide tube (207) passes through the suction cup bottom plate (301); the air guide tube (207) is connected to the conductive suction cup hanger (205); the other end of the air guide tube (207) is connected to an air pump and a control system (204); and the lead terminal (307) is connected to a test lead (4).

3. The wind turbine blade lightning protection grounding loop resistance measurement system according to claim 2 is characterized in that: The suction cup bottom plate (301) is provided with a lighting hole and a camera hole, a lighting lamp (304) is installed in the lighting hole, and a camera (305) is installed in the camera hole.

4. The wind turbine blade lightning protection grounding loop resistance measurement system according to claim 2 is characterized in that: The conductive ring (306) is sleeved on the air guide tube (207).

5. The wind turbine blade lightning protection grounding loop resistance measurement system according to claim 3 is characterized in that: The lighting holes and the camera holes are on the same circumference, and the lighting holes and the camera holes are staggered in sequence, and the lighting holes and the camera holes are evenly distributed along the circumference.

6. The wind turbine blade lightning protection grounding loop resistance measurement system according to claim 2, characterized in that: The end surface of the conductive ring (306) is higher than the suction cup support bar (303) and the air guide tube (207).

7. The wind turbine blade lightning protection grounding loop resistance measurement system according to claim 2 is characterized in that: The suction cup body is made of soft rubber integrally cast.

8. The wind turbine blade lightning protection grounding loop resistance measurement system according to claim 2 is characterized in that: The air guide tube (207) is provided with a valve (206), and the control end of the valve (206) is connected to the air pump and the control system (204).

9. The wind turbine blade lightning protection grounding loop resistance measurement system according to claim 2, characterized in that: The conductive ring (306) and the lead terminal (307) are made of copper conductive material; The air guide tube (207) is made of insulating material.

10. A method for measuring the resistance of a wind turbine blade lightning protection grounding loop, characterized in that: The wind turbine blade lightning protection grounding loop resistance measurement system according to claim 2 comprises the following steps: The drone (201) is controlled to stop at the upper side of the blade (102) to be tested, the position of the blade lightning receptor (106) is checked through the drone camera (203), and the drone (201) is controlled to make the blade lightning receptor (106) to be tested face the conductive ring (306), and then the drone (201) is controlled to make the conductive suction cup (3) stick to the blade lightning receptor (106) to be tested, and the air pump and control system (204) are started to suck air through the air guide pipe (207) so that the conductive suction cup (3) and the blade lightning receptor (106) are tightly connected, and then the lightning protection grounding loop resistance of the blade (102) is measured through a direct resistance tester (5), a test lead (4), a conductive ring (306) and a lead-out terminal (307) on the conductive suction cup (3), a lead (105) between the blade lightning receptor and the blade root flange, and a grounding down conductor (104) between the pitch bearing and the tower grounding electrode.

Images