CN110792564B - A method and device for detecting and locating faults of down conductors of fan blades - Google Patents

Abstract

The embodiment of the invention discloses a method and a device for detecting and positioning faults of a down lead of a fan blade, wherein the method comprises the following steps: acquiring the transmission waveforms of nanosecond incident pulses in a fault-free fan blade down lead and a fan blade down lead to be detected; carrying out correlation processing on the two propagation waveforms to obtain waveforms after correlation processing; dividing the waveform after relevant processing into fault judgment sections according to the position of the branch point of the down lead of the fan blade; determining fault reflection waves which can meet preset conditions in a fault judging section; and determining the position of the branch point of the blade down conductor with the fault in the fault judging section according to the fault reflected wave and the nanosecond incident pulse. Carrying out relevant processing on the propagation waveforms, and reversely pushing the fault condition of the branch point of the down lead of the fan blade according to the waveform difference; determining the position of a branch point of a down lead of a fan blade with a fault in a fault judging section according to the fault reflected wave and the nanosecond incident pulse; the fault detection and positioning of the down lead of the fan blade are realized.

Description

A method and device for detecting and locating faults of down conductors of fan blades

technical field

The invention relates to the technical field of computers, in particular to a method and device for detecting and locating faults of down-conductors of fan blades.

Background technique

With the continuous development of wind power generation, the capacity of a single machine has been continuously increased, and the size of the whole machine has been continuously increased. During the operation process, the blades are always in a high position, so the situation of being struck by lightning is more and more obvious.

At present, the method of measuring lightning protection channel resistance is mostly used for fault detection of blade down-conductors in wind farms. In addition, some foreign scholars proposed to use the half-wave dipole antenna theory and the electrostatic capacitance method to detect the fracture position of the downconductor of the blade, but they ignored the downconductor branch and could not detect the branch fracture problem, and this method is still in practical application. There are great difficulties; another scholar proposed a method of using an X-ray instrument to determine the disconnection position of the blade down-conductor, but this method is expensive and is not conducive to widespread implementation.

Therefore, how to detect and locate the down-conductor fault of the fan blade has become an urgent problem to be solved.

SUMMARY OF THE INVENTION

Due to the above-mentioned problems in the existing methods, the embodiments of the present invention provide a method and device for detecting and locating a fault of a down-conductor of a fan blade.

In a first aspect, an embodiment of the present invention proposes a method for detecting and locating a fault in a fan blade down-conductor, including: respectively acquiring the propagation of nanosecond incident pulses in the down-conductor of a non-faulty fan blade and in the down-conductor of a fan blade to be detected. waveform; wherein, the acquired propagation waveform of the nanosecond incident pulse in the downconductor of the fault-free fan blade is the first propagation waveform; the acquired nanosecond incident pulse is in the downconductor of the fan blade to be detected. The propagation waveform in is the second propagation waveform;

Correlation processing is performed on the first propagation waveform and the second propagation waveform to obtain a waveform after correlation processing;

According to the position of the branch point of the down-conducting wire of the fan blade, the fault judgment section is divided for the waveform after the relevant processing;

Determining the fault reflection wave that can meet the preset condition in the fault judgment section;

According to the fault reflected wave and the nanosecond incident pulse, the position of the branch point of the down-conductor of the fan blade in the fault judgment section is determined.

Optionally, performing correlation processing on the first propagation waveform and the second propagation waveform to obtain a correlated processed waveform, including:

performing wavelet denoising processing on the first propagation waveform and the second propagation waveform;

performing difference processing on the first propagation waveform after wavelet denoising processing and the second propagation waveform after wavelet denoising processing to obtain a difference processing waveform;

Smooth fitting is performed on the differentially processed waveform to obtain the correlated processed waveform.

Optionally, according to the position of the branch point of the down-conductor of the fan blade, the fault judgment section is divided for the waveform after the relevant processing, including:

According to the position of each branch point of the down conductor of the fan blade, the waveform after the correlation processing is divided to obtain the fault judgment section corresponding to the position of each branch point of the down conductor of the fan blade.

Optionally, the preset condition includes: a rising edge duration of the correlated processed waveform in the fault determination section is greater than a first preset time and a falling edge duration is greater than a second preset time.

Optionally, determining the location of the branch point of the downconductor of the fan blade that has failed in the fault judgment section according to the fault reflected wave and the nanosecond incident pulse includes: according to the formula

Determine the position of the branch point of the down-conductor of the fan blade that has failed in the fault judgment section;

Among them, v is the propagation speed of the nanosecond incident pulse in the down-conductor of the fan blade; Δt is the propagation time difference between the fault reflected wave peak and the nanosecond incident pulse peak; L is the down-conductor branch of the faulty fan blade The distance between the point and the measurement point.

In a second aspect, an embodiment of the present invention further provides a device for detecting and locating a blade down-conductor fault, including: an acquisition module, a related processing module, a division module, a first determination module, and a second determination module;

The acquisition module is used to acquire the propagation waveforms of the nanosecond incident pulse in the down-lead of the fan blade without fault and in the down-conduct of the fan blade to be detected, respectively; wherein, the acquired nanosecond incident pulse is The propagation waveform in the down wire of the fan blade is the first propagation waveform; the acquired propagation waveform of the nanosecond incident pulse in the down wire of the fan blade to be detected is the second propagation waveform;

the correlation processing module, configured to perform correlation processing on the first propagation waveform and the second propagation waveform to obtain a correlated processed waveform;

The dividing module is configured to divide the waveforms after relevant processing into fault judgment sections according to the positions of the branch points of the down-conductors of the fan blades;

The first determination module is used to determine the fault reflection wave that can meet the preset condition in the fault judgment section;

The second determining module is configured to determine the position of the branch point of the down-conductor of the blade in the fault judgment section according to the fault reflected wave and the nanosecond incident pulse.

Optionally, the relevant processing module is specifically used for:

performing wavelet denoising processing on the first propagation waveform and the second propagation waveform;

performing difference processing on the first propagation waveform after wavelet denoising processing and the second propagation waveform after wavelet denoising processing to obtain a difference processing waveform;

Smooth fitting is performed on the differentially processed waveform to obtain the correlated processed waveform.

Optionally, the division module is specifically configured to: divide the waveform after the correlation processing according to the position of each branch point of the down-conductor of the fan blade, and obtain each branch of the down-conductor of the fan blade. The fault judgment section corresponding to the position of the point.

Optionally, the preset condition includes: a rising edge duration of the correlated processed waveform in the fault determination section is greater than a first preset time and a falling edge duration is greater than a second preset time.

Optionally, the second determining module is specifically configured to: according to the formula

Determine the position of the branch point of the down-conductor of the fan blade that has failed in the fault judgment section;

Among them, v is the propagation speed of the nanosecond incident pulse in the down-conductor of the fan blade; Δt is the propagation time difference between the fault reflected wave peak and the nanosecond incident pulse peak; L is the down-conductor branch of the faulty fan blade The distance between the point and the measurement point.

In a third aspect, an embodiment of the present invention further provides an electronic device, including:

at least one processor; and

at least one memory communicatively coupled to the processor, wherein:

The memory stores program instructions executable by the processor, the processor invoking the program instructions capable of performing the above-described method.

In a fourth aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, where the non-transitory computer-readable storage medium stores a computer program, and the computer program causes the computer to execute the above method.

It can be seen from the above technical solutions that in the embodiment of the present invention, the first propagation waveform and the second propagation waveform are first correlated and processed, and then the fault situation of the down-conductor branch point of the fan blade is reversed according to the waveform difference; The pulse is used to determine the position of the branch point of the down-conductor of the fan blade that has failed in the fault judgment section; the fault detection and location of the down-conductor of the fan blade is realized.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts.

1 is a schematic flowchart of a method for detecting and locating a fan blade down-conductor fault according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of acquiring a propagation waveform according to an embodiment of the present invention;

3 is a schematic diagram of facing the windward side of the fan blade and the windward side of the fan blade facing upward according to an embodiment of the present invention;

4 is a schematic structural diagram of a device for detecting and locating a fan blade down-conductor fault according to an embodiment of the present invention;

FIG. 5 is a logical block diagram of an electronic device according to an embodiment of the present invention.

Detailed ways

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

FIG. 1 shows a schematic flowchart of a method for detecting and locating a fan blade down-conductor fault provided in this embodiment, including:

S11. Acquire the propagation waveforms of the nanosecond incident pulse in the down-lead of the non-faulty fan blade and in the down-conduct of the fan blade to be detected, respectively; wherein, the acquired nanosecond incident pulse is in the down-lead of the non-faulty blade The propagation waveform obtained is the first propagation waveform; the obtained propagation waveform of the nanosecond incident pulse in the downconduct of the fan blade to be detected is the second propagation waveform.

Wherein, the nanosecond incident pulse is a pulse injected by a nanosecond incident pulse generator at the root of the fan blade to the down-conductor of the fan blade, as shown in FIG. 2 . The root of the fan blade is the leftmost end of the fan blade as shown in Figure 3(a). The fault-free fan blade down-conduct is the down-conduct of the fan blade that has not failed. The down-lead of the fan blade to be detected is shown in Figure 2 . The propagation waveform is a waveform obtained by a waveform acquisition device at the root of the fan blade. The first propagation waveform is the obtained propagation waveform of the nanosecond incident pulse in the downconductor of a fault-free fan blade. The second propagation waveform is the obtained propagation waveform of the nanosecond incident pulse in the downconductor of the fan blade to be detected.

It should be noted that, the operation of acquiring the propagation waveform of the nanosecond incident pulse in the down conductor of the faultless fan blade only needs to be performed once when the present invention is applied for the first time. Store the acquired propagation waveform of the nanosecond incident pulse in the down-conductor of the non-faulty blade, and directly use the stored down-conductor fault detection and location method for the second and subsequent implementations of the method The propagation waveform of the nanosecond incident pulse in the downconductor of the faultless blade is sufficient.

It should also be noted here that "first" and "second" in the first propagation waveform and the second propagation waveform are used to distinguish two different propagation waveforms, and do not represent a sequence relationship.

S12. Perform correlation processing on the first propagation waveform and the second propagation waveform to obtain a correlated-processed waveform.

Wherein, the relevant processing includes but is not limited to error processing. The difference processing is to subtract the second propagation waveform from the first propagation waveform.

S13. According to the position of the branch point of the down-conducting wire of the fan blade, the waveform after the relevant processing is divided into a fault judgment section.

Wherein, the branch point of the down-conductor of the fan blade is shown in Figure 3(b). The fault judgment section is obtained by dividing the waveform after the correlation processing according to the position of the branch point of the fan blade.

S14. Determine the fault reflected waves in the fault judgment section that can satisfy the preset condition.

Wherein, the fault reflected wave is a waveform extracted from the relevant processed waveforms in the fault judgment section. The preset condition is that the duration of the rising edge of the correlated processed waveform in the fault judgment section is greater than the first preset time and the duration of the falling edge is greater than the second preset time.

S15: Determine the position of the branch point of the down-conductor of the fan blade that has failed in the fault judgment section according to the fault reflected wave and the nanosecond incident pulse.

Wherein, the branch point of the down-conductor of the fan blade in which the fault has occurred is the branch point of the down-conductor of the fan blade corresponding to the fault reflected wave that can satisfy the preset condition in the fault judgment section.

In the embodiment of the present invention, the first propagating waveform and the second propagating waveform are first correlated and processed, and then the fault condition of the down-conductor branch point of the fan blade is reversed according to the waveform difference; the fault judgment section is determined according to the fault reflected wave and the nanosecond incident pulse. The position of the branch point of the down-conducting wire of the fan blade that has a fault in the interior is realized; the invention realizes the fault detection and positioning of the down-conducting wire of the fan blade.

Further, on the basis of the foregoing method embodiments, the performing correlation processing on the first propagation waveform and the second propagation waveform to obtain a waveform after correlation processing includes: comparing the first propagation waveform with the second propagation waveform. performing wavelet denoising processing on the second propagation waveform; performing difference processing on the first propagation waveform after wavelet denoising processing and the second propagation waveform after wavelet denoising processing to obtain a differentially processed waveform; Smooth fitting is performed on the differentially processed waveform to obtain the correlated processed waveform.

Wherein, since the actually collected propagation waveform contains a lot of noise interference, before making a difference between the first propagation waveform and the second propagation waveform, first use the wavelet analysis method to analyze the first propagation waveform and the second propagation waveform. The second propagation waveform is subjected to wavelet denoising processing to filter out noise interference. Then, the difference processing is performed on the first propagation waveform after wavelet denoising processing and the second propagation waveform after wavelet denoising processing, that is, the first propagation waveform after wavelet denoising processing is used to reduce the noise. The second propagation waveform after wavelet denoising processing is removed to obtain a waveform after difference processing. In order to facilitate finding the fault reflected wave and calculating the transmission time difference between the fault reflected wave and the nanosecond incident pulse, in the embodiment of the present invention, smooth fitting is performed on the differentially processed waveform to obtain the correlated processed waveform, The peak of the fault reflected wave in step S14 is made more obvious.

In the embodiment of the present invention, a large amount of noise is filtered out by performing wavelet denoising processing on the first propagation waveform and the second propagation waveform. Smooth fitting of the differentially processed waveform facilitates finding the fault reflected wave and calculating the transit time difference between the fault reflected wave and the nanosecond incident pulse, and can make the peak of the fault reflected wave in step S14 more obvious.

Further, on the basis of the above-mentioned method embodiments, the step of dividing the waveform after relevant processing into fault judgment sections according to the position of the branch point of the fan blade down-conductor includes: according to each branch of the fan blade down-conductor. According to the position of the point, the waveform after the correlation processing is divided, and the fault judgment section corresponding to the position of each branch point of the down-conductor of the fan blade is obtained.

Among them, each branch point of the fan blade down-conduct has its own position. The waveforms after relevant processing are divided for each branch point of the down-conductor of the fan blade, and the fault judgment section corresponding to the position of each branch point of the down-conductor of the fan blade is obtained, that is, each branch point of the down-conductor of the fan blade is obtained. Included in the corresponding fault judgment section. It should be noted that the number of fault judgment sections obtained by dividing the waveforms after relevant processing according to the above method is the same as the number of branch points of the fan blade down-conducting line, and there is only one fan blade down-conducting section in each fault judgment section. Line branch point. It is only necessary to judge whether there is a fault reflection wave in the fault judgment section, and perform zero-setting processing on the waveforms outside the fault judgment section, and it is not necessary to judge the waveforms outside the fault judgment section.

The embodiment of the present invention reduces the adverse effect of useless wave crests outside the fault judgment section on finding fault reflection wave crests by dividing the fault judgment section, and improves the accuracy of fault detection and location.

Further, on the basis of the above method embodiments, the preset conditions include: the duration of the rising edge of the waveform after the correlation processing in the fault judgment section is greater than the first preset time and the duration of the falling edge. greater than the second preset time.

Wherein, the duration of the rising edge is the time interval corresponding to the wave band in which the waveform after the correlation processing is in a rising trend. The falling edge duration is a time interval corresponding to the wave band in which the waveform after the correlation processing is in a falling trend. Both the first preset time and the second preset time are manually set time intervals.

In the embodiment of the present invention, by setting preset conditions, the fault reflected waves in the fault judgment section that satisfy the preset conditions are determined.

Further, on the basis of the above method embodiments, determining the location of the branch point of the down-conductor of the fan blade that has failed in the fault judgment section according to the fault reflected wave and the nanosecond incident pulse, including: : According to the formula

Determine the position of the branch point of the down-conductor of the fan blade that has failed in the fault judgment section;

Among them, v is the propagation speed of the nanosecond incident pulse in the down-conductor of the fan blade; Δt is the propagation time difference between the fault reflected wave peak and the nanosecond incident pulse peak; L is the down-conductor branch of the faulty fan blade The distance between the point and the measurement point.

Among them, in the embodiment of the present invention, the maximum value discrimination method is used to find the fault reflected wave. Only the maximum value point of the rising edge whose duration is longer than the first preset time and the falling edge whose duration is longer than the second preset time is identified as a fault reflection wave peak. For different types of fans, due to the influence of the length and structure of the down conductor, the time requirements for the rising edge and falling edge of the fault reflected wave may be slightly different. If the fault reflection wave crest that meets the preset conditions is found, the position of the branch point of the down conductor of the faulty fan blade can be determined according to the propagation speed of the nanosecond incident pulse in the down conductor of the fan blade and the difference between the fault reflection wave crest and the down conductor of the fan blade. The propagation time difference between the incident pulse peaks in nanoseconds is determined. The position L of the branch point of the down-conductor of the faulty fan blade is the distance between the branch point of the down-conductor of the faulty fan blade and the measurement point. specifically,

Among them, v is the propagation speed of the nanosecond incident pulse in the downconductor of the fan blade; Δt is the propagation time difference between the peak of the fault reflected wave and the peak of the nanosecond incident pulse.

It should be noted that the propagation velocity v of the nanosecond incident pulse in the downconduct of the blade can be obtained by taking the average value of multiple actual measurements. The measurement point is the leftmost side of the schematic diagram facing the windward surface of the fan blade shown in FIG. 3( a ), that is, the root of the fan blade.

FIG. 4 shows a schematic structural diagram of a device for detecting and locating a blade downconductor fault provided in this embodiment, the device includes: an acquisition module 41 , a related processing module 42 , a division module 43 , a first determination module 44 and a first determination module 44 . 2. Determine the module 45;

The acquisition module 41 is used to acquire the propagation waveforms of the nanosecond incident pulse in the down-lead of the fan blade without fault and in the down-conduct of the fan blade to be detected, respectively; The propagation waveform in the down wire of the faulty fan blade is the first propagation waveform; the acquired propagation waveform of the nanosecond incident pulse in the down wire of the fan blade to be detected is the second propagation waveform;

The correlation processing module 42 is configured to perform correlation processing on the first propagation waveform and the second propagation waveform to obtain a correlated processed waveform;

The dividing module 43 is configured to divide the waveforms after the relevant processing into fault judgment sections according to the positions of the branch points of the down-conductors of the fan blades;

The first determination module 44 is configured to determine the fault reflection wave that can meet the preset condition in the fault judgment section;

The second determination module 45 is configured to determine the position of the branch point of the down-conductor of the fan blade that has failed in the fault judgment section according to the fault reflected wave and the nanosecond incident pulse.

Further, on the basis of the above device embodiments, the relevant processing module 42 is specifically used for:

performing wavelet denoising processing on the first propagation waveform and the second propagation waveform;

performing difference processing on the first propagation waveform after wavelet denoising processing and the second propagation waveform after wavelet denoising processing to obtain a difference processing waveform;

Smooth fitting is performed on the differentially processed waveform to obtain the correlated processed waveform.

Further, on the basis of the above-mentioned device embodiment, the dividing module 43 is specifically used for: dividing the waveform after the correlation processing according to the position of each branch point of the down-conducting line of the fan blade to obtain the corresponding waveforms respectively. The fault judgment section corresponding to the position of each branch point of the fan blade down-conductor.

Further, on the basis of the above device embodiment, the preset conditions include: the duration of the rising edge of the waveform after the correlation processing in the fault judgment section is greater than the first preset time and the duration of the falling edge. greater than the second preset time.

Further, on the basis of the above device embodiments, the second determining module 45 is specifically configured to: according to the formula

Determine the position of the branch point of the down-conductor of the fan blade that has failed in the fault judgment section;

Among them, v is the propagation speed of the nanosecond incident pulse in the down-conductor of the fan blade; Δt is the propagation time difference between the fault reflected wave peak and the nanosecond incident pulse peak; L is the down-conductor branch of the faulty fan blade The distance between the point and the measurement point.

5 is a logical block diagram of an electronic device provided by an embodiment of the present invention; the electronic device includes: a processor (processor) 51, a memory (memory) 52, and a bus 53;

The processor 51 and the memory 52 communicate with each other through the bus 53; the processor 51 is configured to call program instructions in the memory 52 to execute the method provided by the above method embodiments.

An embodiment of the present invention further provides a non-transitory computer-readable storage medium, where the non-transitory computer-readable storage medium stores a computer program, and the computer program causes the computer to execute the above method.

The device embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

From the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on this understanding, the above-mentioned technical solutions can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic A disc, an optical disc, etc., includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments or some parts of the embodiments.

It should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be used for The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. A method for detecting and positioning faults of a down lead of a fan blade is characterized by comprising the following steps:

acquiring the propagation waveforms of nanosecond incident pulses in a fault-free fan blade down lead and a fan blade down lead to be detected respectively; the acquired propagation waveform of the nanosecond incident pulse in the fault-free fan blade down lead is a first propagation waveform; the acquired transmission waveform of the nanosecond incident pulse in the to-be-detected fan blade down lead is a second transmission waveform;

performing correlation processing on the first propagation waveform and the second propagation waveform to obtain a waveform after correlation processing;

dividing the waveform after the relevant processing into fault judging sections according to the position of the branch point of the down lead of the fan blade;

determining fault reflection waves which can meet preset conditions in the fault judging section;

determining the position of a branch point of a fan blade down lead with a fault in the fault judging section according to the fault reflected wave and the nanosecond incident pulse;

the correlating the first propagated waveform with the second propagated waveform to obtain a correlated waveform includes:

performing wavelet denoising processing on the first propagation waveform and the second propagation waveform;

performing difference processing on the first propagation waveform subjected to wavelet denoising processing and the second propagation waveform subjected to wavelet denoising processing to obtain a waveform subjected to difference processing;

smoothly fitting the waveform subjected to the difference processing to obtain the waveform subjected to the relevant processing;

the dividing the waveform after the relevant processing into fault judging sections according to the position of the branch point of the down lead of the fan blade comprises the following steps:

dividing the waveforms after the relevant processing according to the position of each branch point of the fan blade down conductor to obtain the fault judging sections corresponding to the positions of each branch point of the fan blade down conductor respectively;

the number of the fault judging sections is the same as that of the fan blade down conductor branch points, and each fault judging section is provided with only one fan blade down conductor branch point;

the preset conditions include: the duration of the rising edge of the waveform after the relevant processing in the fault judgment section is greater than a first preset time and the duration of the falling edge is greater than a second preset time.

2. The method for detecting and locating the fault of the fan blade down conductor according to claim 1, wherein the determining the position of the branch point of the fan blade down conductor with the fault in the fault judgment section according to the fault reflected wave and the nanosecond incident pulse includes: according to the formula

Determining the position of a branch point of a fan blade down conductor with a fault in the fault judging section;

wherein v is the propagation speed of the nanosecond incident pulse in the down conductor of the fan blade; delta t is the propagation time difference between the fault reflected wave peak and the nanosecond incident pulse peak; and L is the distance between the branch point of the down lead of the failed fan blade and the measuring point.

3. The utility model provides a fan blade downlead fault detection and positioner, its characterized in that includes: the device comprises an acquisition module, a related processing module, a dividing module, a first determining module and a second determining module;

the acquisition module is used for respectively acquiring the propagation waveforms of nanosecond incident pulses in a fault-free fan blade down lead and a fan blade down lead to be detected; the acquired propagation waveform of the nanosecond incident pulse in the fault-free fan blade down lead is a first propagation waveform; the acquired transmission waveform of the nanosecond incident pulse in the to-be-detected fan blade down lead is a second transmission waveform;

the correlation processing module is configured to perform correlation processing on the first propagation waveform and the second propagation waveform to obtain a waveform after the correlation processing;

the dividing module is used for dividing the waveform after the relevant processing into fault judging sections according to the position of the branch point of the fan blade down lead;

the first determining module is configured to determine a fault reflected wave that can meet a preset condition in the fault determination section;

the second determining module is configured to determine, according to the fault reflected wave and the nanosecond incident pulse, a position of a branch point of a fan blade down lead in the fault determination section, where a fault occurs;

the relevant processing module is specifically configured to:

performing wavelet denoising processing on the first propagation waveform and the second propagation waveform;

performing difference processing on the first propagation waveform subjected to wavelet denoising processing and the second propagation waveform subjected to wavelet denoising processing to obtain a waveform subjected to difference processing;

smoothly fitting the waveform subjected to the difference processing to obtain the waveform subjected to the relevant processing;

the dividing module is specifically configured to: dividing the waveforms after the relevant processing according to the position of each branch point of the fan blade down conductor to obtain the fault judging sections corresponding to the positions of each branch point of the fan blade down conductor respectively; the number of the fault judging sections is the same as that of the fan blade down conductor branch points, and each fault judging section is provided with only one fan blade down conductor branch point;

the preset conditions include: the duration of the rising edge of the waveform after the relevant processing in the fault judgment section is greater than a first preset time and the duration of the falling edge is greater than a second preset time.

4. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the program, implements the method of detecting and locating a fault in a down conductor of a wind turbine blade according to any of claims 1 to 2.

5. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the method of fan blade down conductor fault detection and location of any of claims 1-2.

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