Device and method for generating and collecting charge pulses to judge down conductor damage

Abstract

The present invention discloses a device for generating and collecting charge pulses to judge the damage of a down conductor, comprising a charge pulse generating device, a charge pulse collecting device, and a data processing device connected in sequence, wherein the charge pulse generating device is installed at the tip of a wind turbine blade, and the charge pulse collecting device is installed at the lower end of a lightning-inducing grounding wire. The present invention also discloses a judgment method of the device for generating and collecting charge pulses to judge the damage of a down conductor. The present invention can detect whether the lightning-inducing grounding wire inside a wind turbine blade is well grounded and whether it is intact and undamaged.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power detection, and specifically relates to a device for generating and collecting charge pulses to judge down conductor damage. The present invention also relates to a judgment method for the device for generating and collecting charge pulses to judge down conductor damage. Background Art

[0002] The lightning-leading grounding wire for wind turbine blades is an important facility to protect wind turbine blades from damage by lightning and discharge lightning energy to the earth. The lightning-leading grounding wire is designed inside the existing wind turbine blades. When the wind turbine blades are struck by lightning, the lightning-leading grounding wire can conduct the lightning current into the earth to avoid damage, perforation or even breakage of the blades caused by excessive lightning current. In the past, in the lightning environment, wind turbine blades were often damaged after being struck by lightning, causing significant economic losses.

[0003] Conventional methods can only use on-site overhead leads to conduct impedance tests between the tip of the wind turbine blade and the grounding point of the down conductor. If the impedance test is normal, the down conductor is considered to be intact. If the impedance test is abnormal, the down conductor is considered to be damaged and needs to be repaired and replaced. This detection method requires a large amount of work, low detection efficiency, and involves dangerous operations such as high-altitude operations, which greatly affects the measurement of wind turbine blade lightning conductors.

[0004] The more advanced method currently available is the single-ended pulse measurement method, which can be used to perform pulse testing at the lower end of the lightning grounding wire. The pulse measurement accuracy basically meets the requirements, but the device can only monitor cables with a shielding layer or at least 2 cores. For wind turbine blade down conductors, which are generally single-strand copper or aluminum cables, the measurement effect is greatly reduced. Basically, it cannot meet the use requirements. Summary of the invention

[0005] The purpose of the present invention is to provide a device for generating and collecting charge pulses to determine damage to down conductors, so as to detect whether the lightning-inducing grounding wire inside a wind turbine blade is well grounded and intact.

[0006] Another object of the present invention is to provide a method for determining the damage of a down conductor by generating and collecting charge pulses.

[0007] The first technical solution adopted by the present invention is a device for generating, collecting and judging damage to the down conductor by charge pulses, comprising a charge pulse generating device, a charge pulse collecting device and a data processing device connected in sequence. The charge pulse generating device is installed at the tip of the wind turbine blade. The charge pulse generating device is also connected to the discharge gap. A charge pulse collecting device is installed at the lower end of the lightning induction grounding wire.

[0008] The first technical solution of the present invention is also characterized in that:

[0009] The specific structure of the charge pulse generating device is as follows: it includes a closed slide with semicircular ends and a straight line in the middle, the surface of the closed slide is provided with a cover plate for closing, a narrow strip coil is installed on one side of the slide, a U-shaped magnet sliding along the slide is provided inside the slide, pulleys are provided on both sides of the U-shaped magnet, the pulleys can slide along the inner wall of the closed slide, the closed slide is installed parallel to the wind turbine blades, when the wind turbine rotates, the closed slide moves with the rotation of the wind turbine blades, and the U-shaped magnet on the internal slide slides along.

[0010] The charge pulse acquisition device is a pulse voltage acquisition sensor.

[0011] The narrow strip coil is connected to the discharge gap, the discharge gap is connected to the pulse voltage acquisition sensor and the data acquisition sensor, and then connected to the data processing device. The pulse voltage acquisition sensor is connected to the lightning grounding wire. Specifically: one end of the narrow strip coil is connected to the negative end of the discharge gap through the negative wire, and the other end of the narrow strip coil is connected to the positive end of the discharge gap through the positive wire. The discharge gap is also connected in parallel with a capacitor.

[0012] The second technical solution adopted by the present invention is a judgment method of a device for generating and collecting charge pulses to judge the damage of a down conductor. The device for generating and collecting charge pulses to judge the damage of a down conductor is specifically implemented according to the following steps:

[0013] a) When the blade tip turns toward the ground, the U-shaped magnet is at the bottom of the slide;

[0014] b) As the blade rotates, when the blade tip is at the highest point vertically above the ground, the U-shaped magnet slider quickly passes through the narrow strip coil. The U-shaped magnet slides in the closed slideway and passes through the narrow strip coil. The narrow strip coil cuts the magnetic lines of force, thereby generating an induced electromotive force.

[0015] c) After the induced electromotive force is generated, the positive and negative poles of the narrow strip coil are connected to capacitors, and the charge generated by the induced electromotive force will be stored in the capacitor;

[0016] d) As the blades rotate continuously, the charge pulse generating device continuously generates charge, and the voltage across the capacitor gradually increases. The capacitor is a high-voltage film capacitor. When the voltage is higher than the capacitor withstand voltage of 30kV, the capacitor will discharge through the tip facing the lightning grounding wire, so that the charge pulse is conducted to the earth along the lightning grounding wire;

[0017] e) When there is no lightning strike, the charge generating device at the blade tip continuously generates charges, and the capacitor will regularly discharge to the lightning grounding wire. During the downward conduction of the charges, a pulse voltage acquisition sensor at the root of the blade collects the electrical pulse signal of the lightning grounding wire;

[0018] f) The collected pulse signal is transmitted to the data acquisition sensor, and then the pulse signal is recognized by the data processing device: when the pulse signal is received and recognized at regular time intervals, it is considered that the lightning grounding wire is not damaged, otherwise it is considered that the lightning grounding wire is abnormal and needs to be repaired;

[0019] g) After the above process, a charge pulse is generated, and the pulse is collected by the pulse voltage acquisition sensor for data reception and identification, and finally the damage of the lightning grounding wire is judged.

[0020] The beneficial effect of the present invention is that the device for generating, collecting and judging the damage of the down conductor by charge pulse comprises a charge pulse generating device, a charge pulse collecting device and a data processing device. The device is provided with a charge pulse generating device at the tip of the wind turbine blade, and a collecting device is provided at the lower end of the lightning-inducing grounding wire. During the rotation of the blade, the charge pulse generating device is driven to generate charge by the rotation of the blade, and pulses are collected at the lower end of the lightning-inducing grounding wire, so that pulse signals are continuously obtained, and data processing and alarm are performed after the data is collected by the sensor, so as to realize the judgment of the damage of the lightning-inducing grounding wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the device for generating, collecting and judging down conductor damage by charge pulse in the device and judgment method for generating, collecting and judging down conductor damage by charge pulse in the present invention;

[0022] Figure 2 It is a schematic diagram of a charge generating device in a device and a method for determining down conductor damage by generating and collecting charge pulses according to the present invention;

[0023] Figure 3 It is a schematic diagram of coil installation in the device and method for determining down conductor damage by generating and collecting charge pulses of the present invention;

[0024] Figure 4 It is a voltage pulse acquisition sensor in the device and method for generating and collecting charge pulses to judge down conductor damage of the present invention;

[0025] Figure 5 It is a connection relationship diagram of the device for generating, collecting and judging down conductor damage of the charge pulse of the present invention.

[0026] In the figure, 1. charge pulse generating device, 2. discharge gap, 3. data processing device, 4. charge pulse collecting device, 5. cable, 6. lightning grounding wire, 7. capacitor, 8. closed slide, 9. U-shaped magnet, 10. narrow strip coil, 11. positive wire, 12. negative wire, 13. data collecting sensor, 14. cover plate. DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Explanation of terms in this invention:

[0029] Down conductor = lightning grounding wire

[0030] The device and method for judging the damage of down conductor by generating and collecting charge pulses of the present invention are mainly used to detect whether the lightning-inducing grounding wire inside the wind turbine blade is well grounded and intact. It is equipped with a charge pulse generating device 1, a charge pulse collecting device 4, and a data processing device 3. The pulses emitted by one end of the lightning-inducing grounding wire of the wind turbine blade are collected and calculated to judge the integrity of the lightning-inducing grounding wire 6.

[0031] In the present invention, the closed slide 8 serves as a track for the U-shaped magnet 9 to slide; the narrow strip coil 10 is fixed above the closed slide 8, and its center is parallel to the track design of the closed slide 8; the positive line 11 and the negative line 12 of the narrow strip coil 10 are respectively connected to the two ends of the capacitor 7; the function of the capacitor 7 is: the U-shaped magnet 9 rotates with the blade and slides along the closed slide 8, and the generated charge is acquired and stored by the capacitor 7; the discharge gap: the discharge gap is connected in parallel with the capacitor 7, and one end of the discharge gap is connected to the lightning-inducing grounding wire 6; the capacitor 7 is continuously charged, and after being fully charged, the discharge gap breakdown voltage is reached, thereby discharging the lightning-inducing grounding wire 6; the pulse voltage acquisition sensor: that is, a voltage transformer, which is designed with a copper coil and a ferrite core and can measure voltage values; the pulse voltage acquisition sensor is installed through the lightning-inducing grounding wire 6, and is a mutual inductance sensor, and does not need to contact the lightning-inducing grounding wire 6; the data acquisition sensor 13 is connected to the pulse voltage acquisition sensor to transmit data to the data acquisition sensor 13.

[0032] The device for generating, collecting and judging down conductor damage by charge pulse of the present invention has a structure as follows Figure 1 , Figure 5 As shown, it includes a charge pulse generating device 1, a charge pulse collecting device 4, and a data processing device 5 which are connected in sequence. The charge pulse generating device 1 is installed at the tip of the wind turbine blade. The charge pulse generating device 1 is also connected to the discharge gap 2. The charge pulse collecting device 4 is installed at the lower end of the lightning grounding wire 6. During the rotation of the blades, the charge pulse generating device 1 is driven to generate charges through the rotation of the blades. Pulses are collected at the lower end of the lightning grounding wire 6, so that pulse signals are continuously obtained. After the data is collected by the sensor, data processing and alarm are performed, thereby realizing the damage judgment of the lightning grounding wire 6.

[0033] like Figure 2As shown, the specific structure of the charge pulse generating device 1 is: it includes a closed slide 8 with semicircular ends and a straight line in the middle, the surface of the closed slide 8 is provided with a cover plate 14 for sealing, a narrow strip coil 10 is installed on one side of the closed slide 8, a U-shaped magnet 9 sliding along the closed slide 8 is provided in the closed slide 8, pulleys are provided on both sides of the U-shaped magnet 9, the pulleys can slide along the inner wall of the closed slide 8, the closed slide 8 is installed parallel to the wind turbine blades, when the wind turbine rotates, the closed slide 8 moves with the rotation of the wind turbine blades, and the U-shaped magnet 9 on the internal slide slides with it.

[0034] The charge pulse acquisition device 4 is a pulse voltage acquisition sensor, and the data processing device 3 and the charge pulse acquisition device 4 are connected via a cable 5 .

[0035] Combination Figure 3 , Figure 4 The narrow strip coil 10 is connected to the discharge gap 2, the discharge gap 2 is connected to the pulse voltage acquisition sensor and the data acquisition sensor 13 and then connected to the data processing device 3, the pulse voltage acquisition sensor is connected to the lightning grounding wire 6, specifically: one end of the narrow strip coil 10 is connected to the negative end of the discharge gap 2 through the negative line 12, and the other end of the narrow strip coil 10 is connected to the positive end of the discharge gap 2 through the positive line 11, and the discharge gap 2 is also connected in parallel with a capacitor 7.

[0036] The judgment method of the device for judging down conductor damage based on charge pulse generation and collection of the present invention is characterized in that the method is specifically implemented according to the following steps:

[0037] a) When the blade tip is turned toward the ground, the U-shaped magnet 9 is at the bottom of the closed slide 8;

[0038] b) As the blade rotates, when the blade tip is at the highest point vertically above the ground, the U-shaped magnet 9 quickly passes through the narrow strip coil 10. According to the principle of the generator, the U-shaped magnet 9 slides in the closed slide 8 and passes through the narrow strip coil 10. The narrow strip coil 10 cuts the magnetic lines of force to generate an induced electromotive force;

[0039] c) After the induced electromotive force is generated, the positive and negative electrodes of the narrow strip coil 10 are connected to the capacitor 7, and the charge generated by the induced electromotive force will be stored in the capacitor 7;

[0040] d) As the blades rotate continuously, the charge pulse generating device 1 continuously generates charge, and the voltage across the capacitor 7 gradually increases. The capacitor 7 is a high-voltage film capacitor. When the voltage is higher than the withstand voltage of the capacitor 7 of 30 kV, the capacitor 7 will discharge through the tip of the lightning-inducing grounding wire 6, so that the charge pulse is conducted to the ground along the lightning-inducing grounding wire 6;

[0041] e) When there is no lightning strike, the charge pulse generating device 1 at the blade tip continuously generates charges, and the capacitor 7 regularly discharges to the lightning grounding wire 6. During the downward conduction of the charges, a pulse voltage acquisition sensor is provided at the root of the blade to collect the electrical pulse signal of the lightning grounding wire 6;

[0042] f) The collected pulse signal is transmitted to the data acquisition sensor 13, and then the pulse signal is recognized by the data processing device 3: when the pulse signal is received and recognized at a regular time interval (the interval time is one time of charging and discharging the capacitor), it is considered that the lightning grounding wire 6 is not damaged, otherwise it is considered that the lightning grounding wire 6 is abnormal and needs to be repaired;

[0043] g) After the above process, a charge pulse is generated, and the pulse is collected by the pulse voltage collection sensor for data reception and identification, and finally the damage of the lightning grounding wire 6 is judged.

[0044] In the present invention, when the blades rotate continuously, the narrow strip coil 10 in the charge pulse generating device 1 continuously generates an induced electromotive force as the U-shaped magnet 9 continuously passes by, thereby storing a certain amount of charge on the capacitor 7; in the process of continuous lightning strikes, the capacitor 7 is discharged through the discharge gap 2 after being fully charged, thereby generating a discharge voltage pulse on the lightning grounding wire 6; the voltage pulse is transmitted downward through the lightning grounding wire 6, and when the pulse passes through the pulse voltage acquisition sensor at the other end of the lightning grounding wire 6, the pulse voltage acquisition sensor collects the voltage pulse signal and transmits it to the back-end data processing device 3; through the design of the above-mentioned device and acquisition method, a pulse voltage signal will be generated at a certain interval between the upper end of the lightning grounding wire 6 and the grounding end, and by monitoring the regularity of the voltage pulse signal, the goodness of the lightning grounding wire 6 can be monitored online for a long time, thereby realizing the function of judging whether the down conductor is damaged.

[0045] Example 1

[0046] The device for generating, collecting and judging down conductor damage by charge pulse of the present invention has a structure as follows Figure 1 , Figure 5 As shown, it includes a charge pulse generating device 1, a charge pulse collecting device 4, and a data processing device 5 which are connected in sequence. The charge pulse generating device 1 is installed at the tip of the wind turbine blade. The charge pulse generating device 1 is also connected to the discharge gap 2. The charge pulse collecting device 4 is installed at the lower end of the lightning grounding wire 6. During the rotation of the blades, the charge pulse generating device 1 is driven to generate charges through the rotation of the blades. Pulses are collected at the lower end of the lightning grounding wire 6, so that pulse signals are continuously obtained. After the data is collected by the sensor, data processing and alarm are performed, thereby realizing the damage judgment of the lightning grounding wire 6.

[0047] like Figure 2As shown, the specific structure of the charge pulse generating device 1 is: it includes a closed slide 8 with semicircular ends and a straight line in the middle, the surface of the closed slide 8 is provided with a cover plate 14 for sealing, a narrow strip coil 10 is installed on one side of the closed slide 8, a U-shaped magnet 9 sliding along the closed slide 8 is provided in the closed slide 8, pulleys are provided on both sides of the U-shaped magnet 9, the pulleys can slide along the inner wall of the closed slide 8, the closed slide 8 is installed parallel to the wind turbine blades, when the wind turbine rotates, the closed slide 8 moves with the rotation of the wind turbine blades, and the U-shaped magnet 9 on the internal slide slides with it.

[0048] The charge pulse acquisition device 4 is a pulse voltage acquisition sensor, and the data processing device 3 and the charge pulse acquisition device 4 are connected via a cable 5 .

[0049] Example 2

[0050] The device for generating, collecting and judging down conductor damage by charge pulse of the present invention has a structure as follows Figure 1 , Figure 5 As shown, it includes a charge pulse generating device 1, a charge pulse collecting device 4, and a data processing device 5 which are connected in sequence. The charge pulse generating device 1 is installed at the tip of the wind turbine blade. The charge pulse generating device 1 is also connected to the discharge gap 2. The charge pulse collecting device 4 is installed at the lower end of the lightning grounding wire 6. During the rotation of the blades, the charge pulse generating device 1 is driven to generate charges through the rotation of the blades. Pulses are collected at the lower end of the lightning grounding wire 6, so that pulse signals are continuously obtained. After the data is collected by the sensor, data processing and alarm are performed, thereby realizing the damage judgment of the lightning grounding wire 6.

[0051] like Figure 2 As shown, the specific structure of the charge pulse generating device 1 is: it includes a closed slide 8 with semicircular ends and a straight line in the middle, the surface of the closed slide 8 is provided with a cover plate 14 for sealing, a narrow strip coil 10 is installed on one side of the closed slide 8, a U-shaped magnet 9 sliding along the closed slide 8 is provided in the closed slide 8, pulleys are provided on both sides of the U-shaped magnet 9, the pulleys can slide along the inner wall of the closed slide 8, the closed slide 8 is installed parallel to the wind turbine blades, when the wind turbine rotates, the closed slide 8 moves with the rotation of the wind turbine blades, and the U-shaped magnet 9 on the internal slide slides with it.

[0052] The charge pulse acquisition device 4 is a pulse voltage acquisition sensor, and the data processing device 3 and the charge pulse acquisition device 4 are connected via a cable 5 .

[0053] Combination Figure 3 , Figure 4The narrow strip coil 10 is connected to the discharge gap 2, the discharge gap 2 is connected to the pulse voltage acquisition sensor and the data acquisition sensor 13 and then connected to the data processing device 3, the pulse voltage acquisition sensor is connected to the lightning grounding wire 6, specifically: one end of the narrow strip coil 10 is connected to the negative end of the discharge gap 2 through the negative line 12, and the other end of the narrow strip coil 10 is connected to the positive end of the discharge gap 2 through the positive line 11, and the discharge gap 2 is also connected in parallel with a capacitor 7.

[0054] Example 3

[0055] The judgment method of the device for judging down conductor damage based on charge pulse generation and collection of the present invention is characterized in that the method is specifically implemented according to the following steps:

[0056] a) When the blade tip is turned toward the ground, the U-shaped magnet 9 is at the bottom of the closed slide 8;

[0057] b) As the blade rotates, when the blade tip is at the highest point vertically above the ground, the U-shaped magnet 9 quickly passes through the narrow strip coil 10. According to the principle of the generator, the U-shaped magnet 9 slides in the closed slide 8 and passes through the narrow strip coil 10. The narrow strip coil 10 cuts the magnetic lines of force to generate an induced electromotive force;

[0058] c) After the induced electromotive force is generated, the positive and negative electrodes of the narrow strip coil 10 are connected to the capacitor 7, and the charge generated by the induced electromotive force will be stored in the capacitor 7;

[0059] d) As the blades rotate continuously, the charge pulse generating device 1 continuously generates charge, and the voltage across the capacitor 7 gradually increases. The capacitor 7 is a high-voltage film capacitor. When the voltage is higher than the withstand voltage of the capacitor 7 of 30 kV, the capacitor 7 will discharge through the tip of the lightning-inducing grounding wire 6, so that the charge pulse is conducted to the ground along the lightning-inducing grounding wire 6;

[0060] e) When there is no lightning strike, the charge pulse generating device 1 at the blade tip continuously generates charges, and the capacitor 7 regularly discharges to the lightning grounding wire 6. During the downward conduction of the charges, a pulse voltage acquisition sensor is provided at the root of the blade to collect the electrical pulse signal of the lightning grounding wire 6;

[0061] f) The collected pulse signal is transmitted to the data acquisition sensor 13, and then the pulse signal is recognized by the data processing device 3: when the pulse signal is received and recognized at a regular time interval (the interval time is one time of charging and discharging the capacitor), it is considered that the lightning grounding wire 6 is not damaged, otherwise it is considered that the lightning grounding wire 6 is abnormal and needs to be repaired;

[0062] g) After the above process, a charge pulse is generated, and the pulse is collected by the pulse voltage collection sensor for data reception and identification, and finally the damage of the lightning grounding wire 6 is judged.

Claims

1. A device for generating and collecting charge pulses to judge down conductor damage, characterized in that: The invention comprises a charge pulse generating device (1), a charge pulse collecting device (4), and a data processing device (3) connected in sequence, wherein the charge pulse generating device (1) is installed at the tip of a wind turbine blade, the charge pulse generating device (1) is also connected to a discharge gap (2), and a charge pulse collecting device (4) is installed at the lower end of a lightning induction grounding wire (6). The specific structure of the charge pulse generating device (1) is as follows: it comprises a closed slideway (8) with semicircular ends and a straight middle, a cover plate (14) is provided on the surface of the closed slideway (8) for sealing, a narrow strip coil (10) is installed on one side of the closed slideway (8), a U-shaped magnet (9) is provided inside the closed slideway (8) and slides along the slideway, pulleys are provided on both sides of the U-shaped magnet (9), and the pulleys can slide along the inner wall of the closed slideway (8), and the closed slideway (8) is installed parallel to the wind turbine blade. When the wind turbine rotates, the closed slideway (8) moves with the rotation of the wind turbine blades, and the U-shaped magnet (9) on the internal slideway slides along with it. The charge pulse acquisition device (4) is a pulse voltage acquisition sensor. The data processing device (3) and the charge pulse acquisition device (4) are connected through a cable (5). The narrow strip coil (10) is connected to the discharge gap (2). The discharge gap (2) is connected to the pulse voltage acquisition sensor and the data acquisition sensor (13) and then connected to the data processing device (3). The pulse voltage acquisition sensor is connected to the lightning grounding wire (6). Specifically, one end of the narrow strip coil (10) is connected to the negative end of the discharge gap (2) through a negative line (12), and the other end of the narrow strip coil (10) is connected to the positive end of the discharge gap (2) through a positive line (11). The discharge gap (2) is also connected in parallel with a capacitor (7).

2. A judgment method of a device for generating and collecting charge pulses to judge down conductor damage, based on the device for generating and collecting charge pulses to judge down conductor damage according to claim 1, characterized in that: Follow the steps below to implement it: a) When the blade tip is turned toward the ground, the U-shaped magnet (9) is at the bottom of the closed slideway (8); b) As the blade rotates, when the tip of the blade is at the highest point vertically above the ground, the U-shaped magnet (9) quickly passes through the narrow strip coil (10). When the U-shaped magnet (9) slides in the closed slideway (8) and passes through the narrow strip coil (10), the narrow strip coil (10) cuts the magnetic lines of force, thereby generating an induced electromotive force; c) After the induced electromotive force is generated, the positive and negative electrodes of the narrow strip coil (10) are connected to the capacitor (7), and the charge generated by the induced electromotive force is stored in the capacitor (7); d) As the blades rotate continuously, the charge pulse generating device (1) continuously generates charge, and the voltage across the capacitor (7) gradually increases. The capacitor (7) is a high-voltage film capacitor. When the voltage is higher than the withstand voltage of the capacitor (7) of 30 kV, the capacitor (7) will discharge through the tip facing the lightning grounding wire (6), so that the charge pulse is conducted to the ground along the lightning grounding wire (6); e) When there is no lightning strike, the charge pulse generating device (1) at the blade tip continuously generates charges, and the capacitor (7) regularly discharges to the lightning grounding wire (6). During the downward conduction of the charges, a pulse voltage acquisition sensor is provided at the root of the blade to collect the electric pulse signal of the lightning grounding wire (6); f) the collected pulse signal is transmitted to a data acquisition sensor (13), and then the pulse signal is recognized by a data processing device (3): when the pulse signal is received and recognized at regular time intervals, it is considered that the lightning-inducing grounding wire (6) is not damaged; otherwise, it is considered that the lightning-inducing grounding wire (6) is abnormal and needs to be repaired; g) After the above process, a charge pulse is generated, and the pulse is collected by a pulse voltage collection sensor for data reception and identification, thereby finally determining the damage of the lightning grounding wire (6).

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