[go: up one dir, main page]

CN119024226B - Ultrasonic guided wave-based transmission tower grounding electrode corrosion detection method and device - Google Patents

Ultrasonic guided wave-based transmission tower grounding electrode corrosion detection method and device Download PDF

Info

Publication number
CN119024226B
CN119024226B CN202411534308.4A CN202411534308A CN119024226B CN 119024226 B CN119024226 B CN 119024226B CN 202411534308 A CN202411534308 A CN 202411534308A CN 119024226 B CN119024226 B CN 119024226B
Authority
CN
China
Prior art keywords
transmission tower
ultrasonic
corrosion
grounding electrode
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202411534308.4A
Other languages
Chinese (zh)
Other versions
CN119024226A (en
Inventor
张艳飞
谢利明
孙云飞
刘涛玮
房文轩
乔欣
吕磊
刘俊
云峰
刘孝
赵晓春
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inner Mongolia Electric Power Research Institute of Inner Mongolia Power Group Co Ltd
Original Assignee
Inner Mongolia Electric Power Research Institute of Inner Mongolia Power Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inner Mongolia Electric Power Research Institute of Inner Mongolia Power Group Co Ltd filed Critical Inner Mongolia Electric Power Research Institute of Inner Mongolia Power Group Co Ltd
Priority to CN202411534308.4A priority Critical patent/CN119024226B/en
Publication of CN119024226A publication Critical patent/CN119024226A/en
Application granted granted Critical
Publication of CN119024226B publication Critical patent/CN119024226B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/023—Solids
    • G01N2291/0234—Metals, e.g. steel

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The invention discloses a transmission tower grounding electrode corrosion detection method and device based on ultrasonic guided waves, and relates to the technical field of corrosion detection. The method comprises the steps of setting a plurality of ultrasonic guided wave receiving sensors at the ground electrode places of a transmission tower to be detected, applying ultrasonic guided waves, collecting ultrasonic signals reflected by the ground electrode of the transmission tower through the ultrasonic guided wave receiving sensors, carrying out noise filtering pretreatment on the collected ultrasonic signals, carrying out feature extraction on signal data after pretreatment to obtain feature parameters of the ultrasonic signals, obtaining environment parameters around the ground electrode of the transmission tower to be detected, compensating the extracted feature parameters based on the obtained environment parameters to obtain accurate feature parameters, combining the ground resistance of the ground electrode based on the accurate feature parameters to generate corrosion degree coefficients, comparing the calculated corrosion degree coefficients with preset corrosion degree thresholds, and judging the corrosion degree of the ground electrode of the transmission tower to be detected according to different comparison results.

Description

Ultrasonic guided wave-based transmission tower grounding electrode corrosion detection method and device
Technical Field
The invention relates to the technical field of corrosion detection, in particular to a transmission tower grounding electrode corrosion detection method and device based on ultrasonic guided waves.
Background
In modern power systems, the safety and reliability of the transmission towers directly affect the stability of the power transmission. The grounding electrode of the transmission tower is an important component part and is mainly used for ensuring equipment and personal safety and preventing electrical accidents caused by lightning strokes and faults. However, over time, the ground is most likely affected by environmental factors such as geology, climate, etc., resulting in corrosion. Such corrosion can reduce the conductivity of the ground electrode, thereby affecting the safety and stability of the overall power system. Therefore, timely and accurately detecting the corrosion condition of the ground electrode of the transmission tower is a key for ensuring the safe operation of the electric power facilities.
The traditional method for detecting the corrosion of the grounding electrode mainly relies on periodic inspection and manual measurement, and is time-consuming and labor-consuming, and is easily influenced by subjective factors, so that the accuracy and reliability of a detection result are reduced. In addition, the traditional method has limited capability in the aspect of dynamic monitoring, and the state change of the grounding electrode cannot be fed back in real time, so that hysteresis between detection and actual corrosion state is caused. Along with the development of technology, ultrasonic technology is gradually applied to detection in various fields due to the advantages of high efficiency, non-contact property, real-time monitoring and the like. However, in the aspect of corrosion detection of the ground electrode of the transmission tower, a mature application scheme still lacks, so that many potential safety hazards cannot be effectively identified and treated.
Therefore, a detection scheme capable of accurately and rapidly reflecting the corrosion degree of the grounding electrode of the transmission tower is needed, and influence factors under different environmental conditions can be effectively coped with, so that reliable guarantee is provided for safe operation of a power system.
In the prior art, publication number CN116026920A discloses a grounding flat steel corrosion classification and thinning quantification method based on electromagnetic ultrasonic guided waves, which comprises the steps of collecting various grounding flat steel corrosion reference sample detection data in advance, generating a corrosion reference sample database, actually collecting the grounding flat steel detection data, selecting corresponding signal feature quantities capable of accurately reflecting and describing various corrosion thinning information according to the various grounding flat steel corrosion reference sample detection data, and classifying each corresponding signal feature quantity. The method is characterized in that the type of the ground electrode corrosion defect of the ground network is distinguished and evaluated according to the characteristic value of echo data, the thinning degree of flat steel is quantized, the state of the ground electrode is known in time, and the safety and the integrity of the ground electrode are guaranteed; meanwhile, environmental factors are not considered, and the propagation characteristics of ultrasonic signals can be influenced by the environmental factors such as different soil types, humidity and temperature, so that samples with the same corrosion degree generate different echo characteristics in different environments, and the accuracy and the effectiveness of the system are reduced in the implementation process.
The above information disclosed in the background section is only for enhancement of understanding of the background of the disclosure and therefore it may include information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a transmission tower grounding electrode corrosion detection method and device based on ultrasonic guided waves, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The transmission tower grounding electrode corrosion detection method based on ultrasonic guided waves comprises the following specific steps:
determining a ground electrode place of a transmission tower to be detected, arranging a plurality of ultrasonic guided wave receiving sensors at the ground electrode place of the transmission tower to be detected, applying ultrasonic guided waves to the ground electrode of the transmission tower to be detected, and collecting ultrasonic signals reflected by the ground electrode of the transmission tower through the ultrasonic guided wave receiving sensors;
Noise filtering pretreatment is carried out on the collected ultrasonic signals, fourier transformation is carried out on the ultrasonic signals based on the pretreated ultrasonic signals, and feature extraction is carried out on the transformed signal data to obtain feature parameters of the ultrasonic signals, wherein the feature parameters comprise peak amplitude, reflection time and average value of frequency components;
Acquiring environmental parameters around a ground electrode of a transmission tower to be detected, and compensating the extracted ultrasonic signal characteristic parameters based on the acquired environmental parameters to obtain accurate characteristic parameters, wherein the environmental parameters comprise surface temperature and average soil humidity;
based on the compensated accurate characteristic parameters and the grounding resistance of the grounding electrode of the transmission tower to be detected, generating a corrosion degree coefficient, comparing the calculated corrosion degree coefficient with a preset corrosion degree threshold value, and judging the corrosion degree of the grounding electrode of the transmission tower to be detected according to different comparison results.
Further, a plurality of ultrasonic guided wave receiving sensors are arranged at the ground electrode place of the transmission tower to be detected, wherein the method for arranging the ultrasonic guided wave receiving sensors comprises the steps of selecting sensors with working frequencies between 10kHz and 100kHz, for penetrating soil and concrete, arranging a plurality of sensors around the ground electrode with a certain radius to form a sensor matrix so as to capture reflected signals in different directions, wherein the distance between adjacent sensors is kept consistent, and the distance between the adjacent sensors is calculated according to the following formula:
;
In the formula, For the spacing between adjacent sensors,As a result of the empirical coefficient,For the minimum propagation distance of the ultrasonic guided wave,As the signal attenuation coefficient of the signal,Is the frequency of the ultrasonic guided wave,Is the propagation speed of ultrasonic guided waves in the soil.
Further, a low frequency cut-off frequency and a high frequency cut-off frequency are set based on the band-pass filter, wherein the specific expression of the transfer function of the filter is:
;
In the formula, Is the transfer function of the band-pass filter,In order to acquire the frequency of the ultrasonic signal,Indicating the cut-off frequency of the low frequency,Is a high frequency cut-off frequency, and the transfer function is passed through band-pass filterFor 1, the ultrasonic signal is reserved, and the transfer function is calculatedThe ultrasound signal of 0 is discarded.
Further, based on the preprocessed ultrasonic signals, performing Fourier transform on the ultrasonic signals, and performing feature extraction on the transformed signal data to obtain feature parameters of the ultrasonic signals, wherein the formula on which the Fourier transform is performed is as follows:
The formula according to which the ultrasonic signal data is fourier transformed is:
;
In the formula, For the time domain data of the preprocessed ultrasound signal,Is thatA frequency domain signal obtained after fourier transform is performed,In order to acquire the frequency of the ultrasonic signal,Is an imaginary unit for representing phase information;
Based on the frequency domain signal after Fourier transformation, carrying out feature extraction to obtain feature parameters of the ultrasonic signal, wherein the specific formulas according to which the feature parameters are obtained are respectively as follows:
;
;
;
In the formula, For the amplitude of the peak of the wave,In order for the time of reflection to be a function of,In order to receive the moment of time of the reflected signal,In order to transmit the moment of the ultrasonic guided wave,Is an average value of the frequency components,Is the firstThe frequency components of the frequency spectrum are used,For the number of sample points of the fourier transform process,Represent the firstThe magnitude spectrum of the individual frequency components,For the index of the frequency component,。
Further, wherein the firstFrequency componentsThe formula on which the calculation is based is:
;
In the formula, Sampling frequency for the reflected signal receiving sensor;
First, the The formula according to which the magnitude spectrum of each frequency component is calculated is:
;
Wherein, Is thatIs represented by the real part of (c),Is thatIs represented by the imaginary part of (c).
Further, acquiring environmental parameters around a ground electrode of the transmission tower to be detected, compensating the extracted ultrasonic signal characteristic parameters based on the acquired environmental parameters to obtain accurate characteristic parameters, wherein the two characteristic parameters of the peak amplitude and the average value of the frequency components are compensated through the surface temperature and the average soil humidity, and the formulas according to which the accurate characteristic parameters are obtained are respectively:
;
;
In the formula, Representing the exact amplitude of the peak of the wave,Is an accurate average value of the frequency components,For the distance that the ultrasonic guided wave propagates,In order to detect the average humidity of the soil in the area,Is the surface temperatureAnd average soil moistureThe lower decay function of the lower-level decay function,For the reference humidity value to be a reference humidity value,Is the influence coefficient of humidity on the frequency component, wherein the propagation distance of ultrasonic guided waveThe formula on which the calculation is based is:
;
Surface temperature And average soil moistureAttenuation function underThe specific expression of (2) is:
;
in the middle of In order for the attenuation coefficient to be a factor,AndThe influence coefficient of humidity and temperature on the attenuation are respectively,As a value of the reference temperature,To detect the surface temperature of the area, whereinAnd (2) andAndAre all greater than 0.
Further, based on the compensated accurate characteristic parameters and the grounding resistance of the grounding electrode of the transmission tower to be detected, generating a corrosion degree coefficient, wherein a formula on which the corrosion degree coefficient is calculated is as follows:
;
In the formula, As a coefficient of the degree of corrosion,、、AndRespectively the accurate amplitude of the wave crest, the reflection time, the accurate average value of the frequency components and the weight coefficient of the grounding resistance of the grounding electrode,A ground resistance which is a ground electrode, wherein,And is also provided with、、AndAre all greater than 0.
Further, according to the calculated corrosion degree coefficient and the preset corrosion degree threshold value, the logic for judging the corrosion degree of the ground electrode of the transmission tower is based on the fact that the preset corrosion degree threshold value is calibrated;
When (when)When the ground electrode of the transmission tower is judged to be the first-level corrosion degree, maintenance and replacement are not needed;
When (when) When the ground connection of the transmission tower is judged to be the secondary corrosion degree, the staff is reminded to maintain;
When (when) And when the ground electrode of the transmission tower is judged to be three-level corrosion degree, the work should be stopped, and the ground electrode of the transmission tower is replaced.
The invention also provides a transmission tower grounding electrode corrosion detection device based on ultrasonic guided waves, which is used for executing the transmission tower grounding electrode corrosion detection method based on the ultrasonic guided waves, and comprises the following steps:
the ultrasonic signal acquisition module is used for determining the ground electrode place of the transmission tower to be detected, arranging a plurality of ultrasonic guided wave receiving sensors at the ground electrode place of the transmission tower to be detected, applying ultrasonic guided waves to the ground electrode of the transmission tower to be detected, and acquiring ultrasonic signals reflected by the ground electrode of the transmission tower through the ultrasonic guided wave receiving sensors;
the signal characteristic extraction module is used for carrying out noise filtering pretreatment on the collected ultrasonic signals, carrying out Fourier transformation on the ultrasonic signals based on the pretreated ultrasonic signals, and carrying out characteristic extraction on the transformed signal data to obtain characteristic parameters of the ultrasonic signals, wherein the characteristic parameters comprise peak amplitude, reflection time and average value of frequency components;
The signal characteristic correction module is used for acquiring environmental parameters around the grounding electrode of the transmission tower to be detected, compensating the extracted ultrasonic signal characteristic parameters based on the acquired environmental parameters to obtain accurate characteristic parameters, wherein the environmental parameters comprise surface temperature and average soil humidity;
the corrosion degree judging module is used for generating a corrosion degree coefficient based on the compensated accurate characteristic parameters and combining the grounding resistance of the grounding electrode of the transmission tower to be detected, comparing the calculated corrosion degree coefficient with a preset corrosion degree threshold value, and judging the corrosion degree of the grounding electrode of the transmission tower to be detected according to different comparison results.
Compared with the prior art, the invention has the beneficial effects that:
First, by accurately determining the detection site and disposing a plurality of ultrasonic guided wave receiving sensors in the area, comprehensive collection of signals and high quality of data are ensured. The multi-angle data acquisition mode can effectively improve the signal to noise ratio, so that the reliability of signals is enhanced, and the subsequent analysis is more accurate. And secondly, noise filtering pretreatment and Fourier transformation are carried out on the collected ultrasonic signals, so that the signal characteristics can be effectively clear, and key parameters such as peak amplitude, reflection time and frequency components are extracted. The characteristic parameters are combined with the temperature and the humidity of the environment to be detected to compensate, so that the influence of the external environment on the signals is eliminated, and the accuracy of the detection result is ensured. Finally, based on the compensated characteristic parameters and the corrosion degree coefficient generated by the grounding resistor, scientific basis is provided for judging the corrosion degree of the grounding electrode, thereby providing reliable data support for maintenance decision and ensuring the safety and stability of the power system.
Drawings
FIG. 1 is a schematic flow chart of the overall method of the present invention;
FIG. 2 is a schematic diagram of the overall system architecture of the present invention.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
It is to be noted that unless otherwise defined, technical or scientific terms used herein should be taken in a general sense as understood by one of ordinary skill in the art to which the present invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "up", "down", "left", "right" and the like are used only to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.
Examples:
Referring to fig. 1, the present invention provides a technical solution:
The transmission tower grounding electrode corrosion detection method based on ultrasonic guided waves comprises the following specific steps:
The method comprises the steps that step 1, a ground electrode place of a transmission tower to be detected is determined, a plurality of ultrasonic guided wave receiving sensors are arranged at the ground electrode place of the transmission tower to be detected, ultrasonic guided waves are applied to the ground electrode of the transmission tower to be detected, and ultrasonic signals reflected by the ground electrode of the transmission tower are collected through the ultrasonic guided wave receiving sensors;
The method for setting the ultrasonic guided wave receiving sensors comprises the steps of selecting sensors with working frequencies between 10kHz and 100kHz, penetrating soil and concrete, arranging a plurality of sensors around a grounding electrode with a certain radius to form a sensor matrix so as to capture reflected signals in different directions, wherein the distance between adjacent sensors is kept consistent, and the distance between the adjacent sensors is calculated according to the following formula:
;
In the formula, For the spacing between adjacent sensors,As a result of the empirical coefficient,For the minimum propagation distance of the ultrasonic guided wave,As the signal attenuation coefficient of the signal,Is the frequency of the ultrasonic guided wave,Is the propagation speed of ultrasonic guided waves in the soil.
The sensor is fixed on the ground by using a special bracket, so that the bottom of the sensor is ensured to be in good contact with the ground, meanwhile, the transmission efficiency of sound waves can be improved by using a coupling agent (such as coupling glue) at the bottom of the sensor, and the sensor is connected with a data acquisition system by using a shielding cable so as to reduce electromagnetic interference.
Step 2, carrying out noise filtering pretreatment on the collected ultrasonic signals, carrying out Fourier transformation on the ultrasonic signals based on the pretreated ultrasonic signals, and carrying out feature extraction on the transformed signal data to obtain feature parameters of the ultrasonic signals, wherein the feature parameters comprise peak amplitude, reflection time and average value of frequency components;
The logic on which the noise filtering pretreatment is carried out on the collected ultrasonic signals is based on a band-pass filter, wherein the low-frequency cutoff frequency and the high-frequency cutoff frequency are set, and the specific expression of the transfer function of the filter is as follows:
;
In the formula, Is the transfer function of the band-pass filter,In order to acquire the frequency of the ultrasonic signal,Indicating the cut-off frequency of the low frequency,Is a high frequency cut-off frequency, and the transfer function is passed through band-pass filterFor 1, the ultrasonic signal is reserved, and the transfer function is calculatedThe ultrasound signal of 0 is discarded.
Based on the preprocessed ultrasonic signals, carrying out Fourier transform on the ultrasonic signals, and carrying out feature extraction on the transformed signal data to obtain feature parameters of the ultrasonic signals, wherein the formula on which the Fourier transform is carried out is as follows:
The formula according to which the ultrasonic signal data is fourier transformed is:
;
In the formula, For the time domain data of the preprocessed ultrasound signal,Is thatA frequency domain signal obtained after fourier transform is performed,In order to acquire the frequency of the ultrasonic signal,Is an imaginary unit for representing phase information;
Based on the frequency domain signal after Fourier transformation, carrying out feature extraction to obtain feature parameters of the ultrasonic signal, wherein the specific formulas according to which the feature parameters are obtained are respectively as follows:
;
;
;
In the formula, For the amplitude of the peak of the wave,In order for the time of reflection to be a function of,In order to receive the moment of time of the reflected signal,In order to transmit the moment of the ultrasonic guided wave,Is an average value of the frequency components,Is the firstThe frequency components of the frequency spectrum are used,For the number of sample points of the fourier transform process,Represent the firstThe magnitude spectrum of the individual frequency components,For the index of the frequency component,。
Corrosion causes a change in the acoustic properties of the material, especially when a crack or defect occurs in the surface of the material, the ultrasonic waves are scattered and attenuated during propagation, so that the amplitude of the reflected signal is reduced.
Corrosion may cause changes in the internal structure of the material, slowing down the propagation velocity of the ultrasonic waves as they pass through the corroded area, and thus causing an extended arrival time of the reflected waves. In addition, corrosion-induced deformations and imperfections may also increase the path of wave propagation, resulting in an extended reflection time.
As the degree of corrosion increases, the material may suffer from non-uniformity and various defects, which may lead to dispersion of the ultrasonic signal spectrum, manifesting as a reduction in frequency components and a broadening of the spectrum. As the structure of the material becomes more complex, the propagation characteristics of the ultrasonic wave also become more complex, affecting the distribution of its frequency components.
Wherein the firstFrequency componentsThe formula on which the calculation is based is:
;
In the formula, Sampling frequency for the reflected signal receiving sensor;
First, the The formula according to which the magnitude spectrum of each frequency component is calculated is:
;
Wherein, Is thatIs represented by the real part of (c),Is thatIs represented by the imaginary part of (c).
Step 3, acquiring environmental parameters around a ground electrode of a transmission tower to be detected, and compensating the extracted ultrasonic signal characteristic parameters based on the acquired environmental parameters to obtain accurate characteristic parameters, wherein the environmental parameters comprise surface temperature and average soil humidity;
The method comprises the steps of obtaining environmental parameters around a ground electrode of a transmission tower to be detected, compensating the extracted ultrasonic signal characteristic parameters based on the obtained environmental parameters to obtain accurate characteristic parameters, wherein the two characteristic parameters of peak amplitude and average value of frequency components are compensated through surface temperature and average soil humidity, and formulas according to which the accurate characteristic parameters are obtained are respectively as follows:
;
;
In the formula, Representing the exact amplitude of the peak of the wave,Is an accurate average value of the frequency components,For the distance that the ultrasonic guided wave propagates,In order to detect the average humidity of the soil in the area,Is the surface temperatureAnd average soil moistureThe lower decay function of the lower-level decay function,For the reference humidity value to be a reference humidity value,The influence coefficient of humidity on frequency component can be set by published data combined with expert experience, in which the distance of ultrasonic guided wave propagationThe formula on which the calculation is based is:
;
Surface temperature And average soil moistureAttenuation function underThe specific expression of (2) is:
;
in the middle of In order for the attenuation coefficient to be a factor,AndThe influence coefficient of humidity and temperature on the attenuation are respectively,As a value of the reference temperature,To detect the surface temperature of the area, whereinAnd since the influence of humidity on the detection signal is greater than that of temperature, the device is providedAnd (2) andAndAll greater than 0, a suitable reference humidity value is selected, typically, the reference humidity can be selected as a common or ideal environmental condition, such as indoor standard humidity (e.g., 40% or 50% relative humidity), temperature, and the like, typically the reference temperature value isAttenuation coefficientThe measurement can be performed by experiments of the system, the specific steps comprising performing a series of ultrasound propagation experiments at a selected reference humidity, arranging the ultrasound transmitter and receiver and ensuring that they record the ultrasound signal intensities at different distances under the same environmental conditions, and calculating the attenuation of the signal intensities based on the ultrasound signal intensities at different distances.
In high temperature, high humidity environments, the presence of water may affect the propagation of the ultrasound wave guide, in particular by scattering and absorption to increase the attenuation of the wave guide, thus compensating for the two characteristic parameters of peak amplitude and average value of the frequency components, while the reflection time is generally not directly affected by scattering and absorption caused by water molecules
And 4, generating a corrosion degree coefficient based on the compensated accurate characteristic parameters and combining the grounding resistance of the grounding electrode of the transmission tower to be detected, comparing the calculated corrosion degree coefficient with a preset corrosion degree threshold value, and judging the corrosion degree of the grounding electrode of the transmission tower to be detected according to different comparison results.
Based on the compensated accurate characteristic parameters and the grounding resistance of the grounding electrode of the transmission tower to be detected, generating a corrosion degree coefficient, wherein the formula for calculating the corrosion degree coefficient is as follows:
;
In the formula, As a coefficient of the degree of corrosion,、、AndRespectively the accurate amplitude of the wave crest, the reflection time, the accurate average value of the frequency components and the weight coefficient of the grounding resistance of the grounding electrode,In order to obtain the grounding resistance of the grounding electrode, the accurate average value of frequency components and reflection time have relatively small influence degree relative to the grounding resistance of the grounding electrode because the accurate amplitude of wave peaks has the most obvious representation of corrosion degree in parameters reflecting corrosion degree,And is also provided with、、AndAre all greater than 0.
Grounding resistance of grounding electrodeThe specific calculation formula can be calculated according to the contact area of the grounding electrode and the soil and the conductivity characteristic of the soil, and is as follows:
;
In the formula, For the contact area of the grounding electrode and the soil,Is the conductivity characteristic of the soil, wherein the conductivity characteristic of the soilCan be approximated as:
;
In the formula, For a particular coefficient of soil material (related to soil type and condition),The reflection coefficient can be expressed by the square of the ratio of the reflection amplitude to the incidence amplitude.
Comparing the calculated corrosion degree coefficient with a preset corrosion degree threshold value, wherein the logic for judging the corrosion degree of the ground electrode of the transmission tower is based on the fact that the preset corrosion degree threshold value is calibrated;
When (when)When the ground electrode of the transmission tower is judged to be the first-level corrosion degree, maintenance and replacement are not needed;
When (when) When the ground connection of the transmission tower is judged to be the secondary corrosion degree, the staff is reminded to maintain;
When (when) And when the ground electrode of the transmission tower is judged to be three-level corrosion degree, the work should be stopped, and the ground electrode of the transmission tower is replaced.
Referring to fig. 2, the invention further provides a transmission tower grounding electrode corrosion detection device based on ultrasonic guided waves, where the transmission tower grounding electrode corrosion detection device based on ultrasonic guided waves is used to execute the transmission tower grounding electrode corrosion detection method based on ultrasonic guided waves, and the method includes:
the ultrasonic signal acquisition module is used for determining the ground electrode place of the transmission tower to be detected, arranging a plurality of ultrasonic guided wave receiving sensors at the ground electrode place of the transmission tower to be detected, applying ultrasonic guided waves to the ground electrode of the transmission tower to be detected, and acquiring ultrasonic signals reflected by the ground electrode of the transmission tower through the ultrasonic guided wave receiving sensors;
the signal characteristic extraction module is used for carrying out noise filtering pretreatment on the collected ultrasonic signals, carrying out Fourier transformation on the ultrasonic signals based on the pretreated ultrasonic signals, and carrying out characteristic extraction on the transformed signal data to obtain characteristic parameters of the ultrasonic signals, wherein the characteristic parameters comprise peak amplitude, reflection time and average value of frequency components;
The signal characteristic correction module is used for acquiring environmental parameters around the grounding electrode of the transmission tower to be detected, compensating the extracted ultrasonic signal characteristic parameters based on the acquired environmental parameters to obtain accurate characteristic parameters, wherein the environmental parameters comprise surface temperature and average soil humidity;
the corrosion degree judging module is used for generating a corrosion degree coefficient based on the compensated accurate characteristic parameters and combining the grounding resistance of the grounding electrode of the transmission tower to be detected, comparing the calculated corrosion degree coefficient with a preset corrosion degree threshold value, and judging the corrosion degree of the grounding electrode of the transmission tower to be detected according to different comparison results.
The above formulas are all formulas with dimensions removed and numerical values calculated, the formulas are formulas with a large amount of data collected for software simulation to obtain the latest real situation, and preset parameters in the formulas are set by those skilled in the art according to the actual situation.
The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. Those of skill in the art will appreciate that the elements and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application.

Claims (4)

1.一种基于超声导波的输电杆塔接地极腐蚀检测方法，其特征在于，具体步骤包括：1. A method for detecting corrosion of grounding electrodes of transmission towers based on ultrasonic guided waves, characterized in that the specific steps include: 确定待检测输电杆塔接地极地点，在待检测输电杆塔接地极地点设置若干超声导波接收传感器，对待检测输电杆塔接地极施加超声导波，通过超声导波接收传感器采集输电杆塔接地极反射的超声信号；Determine the location of the grounding electrode of the transmission tower to be detected, set up a number of ultrasonic guided wave receiving sensors at the location of the grounding electrode of the transmission tower to be detected, apply ultrasonic guided waves to the grounding electrode of the transmission tower to be detected, and collect ultrasonic signals reflected by the grounding electrode of the transmission tower through the ultrasonic guided wave receiving sensors; 在待检测输电杆塔接地极地点设置若干超声导波接收传感器，其中设置超声导波接收传感器的方法为：选择工作频率在10kHz到100kHz之间的传感器，用于穿透土壤和混凝土，在接地极周围以一定半径布置多个传感器，形成一个传感器矩阵，以捕捉不同方向的反射信号，其中相邻传感器之间的间距保持一致，其中相邻传感器之间的间距计算所依据的公式为：A number of ultrasonic guided wave receiving sensors are set at the grounding electrode of the transmission tower to be detected. The method of setting the ultrasonic guided wave receiving sensors is: select a sensor with an operating frequency between 10kHz and 100kHz to penetrate soil and concrete, and arrange multiple sensors around the grounding electrode with a certain radius to form a sensor matrix to capture reflected signals in different directions, wherein the spacing between adjacent sensors remains consistent, and the formula for calculating the spacing between adjacent sensors is: 式中，d为邻传感器之间的间距，k为经验系数，R为超声导波最小传播距离，τ为信号衰减系数，f为超声导波频率，v为超声导波在土壤中的传播速度；Where d is the distance between adjacent sensors, k is the empirical coefficient, R is the minimum propagation distance of ultrasonic guided waves, τ is the signal attenuation coefficient, f is the frequency of ultrasonic guided waves, and v is the propagation speed of ultrasonic guided waves in the soil; 对采集的超声信号进行噪声过滤预处理，基于预处理后的超声信号，对超声信号进行傅里叶变换，对变换后的信号数据进行特征提取，得到超声信号的特征参数，所述特征参数包括波峰幅度、反射时间和频率成分的平均值；Performing noise filtering preprocessing on the collected ultrasonic signal, performing Fourier transform on the ultrasonic signal based on the preprocessed ultrasonic signal, performing feature extraction on the transformed signal data, and obtaining characteristic parameters of the ultrasonic signal, wherein the characteristic parameters include peak amplitude, reflection time, and average value of frequency components; 其中进行傅里叶变换所依据的公式为：The formula for Fourier transform is: 对超声信号数据进行傅里叶变换所依据的公式为：The formula for Fourier transform of ultrasonic signal data is: 式中，α(t)为预处理后的超声信号时域数据，α(fs)为α(t)进行傅里叶变换后获得的频域信号，fs为采集到的超声信号频率，j为虚数单位，用于表示相位信息；Wherein, α(t) is the time domain data of the preprocessed ultrasonic signal, α( fs ) is the frequency domain signal obtained after Fourier transform of α(t), fs is the collected ultrasonic signal frequency, and j is an imaginary unit used to represent phase information; 基于傅里叶变换后的频域信号，进行特征提取，得到超声信号的特征参数，其中获取特征参数所依据的具体公式分别为：Based on the frequency domain signal after Fourier transformation, feature extraction is performed to obtain the characteristic parameters of the ultrasonic signal. The specific formulas for obtaining the characteristic parameters are: A＝max(|α(fs)|)A＝max(|α(f s )|) Tr＝tref-temi T r = t ref - t emi 式中，A为波峰幅度，Tr为反射时间，tref为接收到反射信号的时刻，temi为发射超声导波的时刻，为频率成分的平均值，fk为第k个频率分量，N为傅里叶变换处理的样本点的数量，|α(fk)|表示第k个频率分量的幅度谱，k为频率分量的索引，k＝0,1,…,N-1；Where A is the peak amplitude, Tr is the reflection time, tref is the time when the reflected signal is received, and temi is the time when the ultrasonic guided wave is emitted. is the average value of the frequency component, f k is the kth frequency component, N is the number of sample points processed by Fourier transform, |α(f k )| represents the amplitude spectrum of the kth frequency component, k is the index of the frequency component, k = 0, 1, ..., N-1; 获取待检测输电杆塔接地极周围的环境参数，基于获取的环境参数对提取的超声信号特征参数进行补偿，得到精确特征参数，其中所述环境参数包括地表温度和土壤平均湿度；Acquire environmental parameters around the grounding electrode of the transmission tower to be detected, and compensate the extracted characteristic parameters of the ultrasonic signal based on the acquired environmental parameters to obtain accurate characteristic parameters, wherein the environmental parameters include surface temperature and average soil humidity; 其中得到精确特征参数所依据的公式分别为：The formulas for obtaining accurate characteristic parameters are: A′＝A*e-α(H,T)*L A′＝A*e -α(H,T)*L 式中，A′表示波峰精确幅度，为频率成分的精确平均值，L为超声导波传播的距离，H为检测区域土壤平均湿度，α(H,T)为地表温度T和土壤平均湿度H下的衰减函数，Href为参考湿度值，βf为湿度对频率成分的影响系数；其中超声导波传播的距离L计算所依据的公式为：Where A′ represents the exact amplitude of the peak, is the precise average value of the frequency component, L is the distance of ultrasonic guided wave propagation, H is the average soil humidity in the detection area, α(H,T) is the attenuation function under the surface temperature T and the average soil humidity H, H ref is the reference humidity value, β f is the influence coefficient of humidity on the frequency component; the formula for calculating the distance L of ultrasonic guided wave propagation is: L＝v*Tr L＝v*T r 地表温度T和土壤平均湿度H下的衰减函数α(H,T)的具体表达式为：The specific expression of the attenuation function α(H,T) under the surface temperature T and the average soil moisture H is: α(H,T)＝α0+βH*(|H-Href|)+βT*(|T-Tref|)α(H,T)＝α 0 +β H *(|HH ref |)+β T *(|TT ref |) 式中α0为衰减系数，βH和βT分别为湿度对衰减的影响系数和温度对衰减的影响系数，Tref为参考温度值，T为检测区域地表温度，其中βH>βT，且βH和βT均大于0；Where α0 is the attenuation coefficient, βH and βT are the influence coefficients of humidity and temperature on attenuation respectively, Tref is the reference temperature value, T is the surface temperature of the detection area, where βH > βT , and βH and βT are both greater than 0; 基于补偿后的精确特征参数结合待检测输电杆塔接地极的接地电阻，生成腐蚀程度系数，根据计算得到的腐蚀程度系数与预先设置的腐蚀程度阈值进行比较，根据不同对比结果判断待检测输电杆塔接地极的腐蚀程度；Based on the compensated accurate characteristic parameters and the grounding resistance of the grounding electrode of the transmission tower to be detected, a corrosion degree coefficient is generated, and the calculated corrosion degree coefficient is compared with a preset corrosion degree threshold, and the corrosion degree of the grounding electrode of the transmission tower to be detected is determined according to different comparison results; 其中计算腐蚀程度系数所依据的公式为：The formula for calculating the corrosion degree coefficient is: 式中，FS为腐蚀程度系数，ω1、ω2、ω3和ω4分别为波峰精确幅度、反射时间、频率成分的精确平均值和接地极的接地电阻的权重系数，R为接地极的接地电阻，其中，ω1>ω4>ω3>ω2且ω1、ω2、ω3和ω4均大于0；Wherein, FS is the corrosion degree coefficient, ω 1 , ω 2 , ω 3 and ω 4 are the weight coefficients of the precise amplitude of the wave peak, the reflection time, the precise average value of the frequency component and the grounding resistance of the grounding electrode respectively, and R is the grounding resistance of the grounding electrode, wherein, ω 1 >ω 4 >ω 3 >ω 2 and ω 1 , ω 2 , ω 3 and ω 4 are all greater than 0; 根据计算得到的腐蚀程度系数与预先设置的腐蚀程度阈值进行比较，判断输电杆塔接地极的腐蚀程度所依据的逻辑为：标定预先设置的腐蚀程度阈值为yz；The logic for judging the corrosion degree of the grounding electrode of the transmission tower by comparing the calculated corrosion degree coefficient with the preset corrosion degree threshold is as follows: calibrate the preset corrosion degree threshold as yz; 当0≤FS<yz*0.3时，判断为输电杆塔接地极为一级腐蚀程度，无需进行维护和更换；When 0≤FS<yz*0.3, it is judged that the grounding pole of the transmission tower is at the first level of corrosion and no maintenance or replacement is required; 当yz*0.3≤FS<yz*0.6时，判断为输电杆塔接地极为二级腐蚀程度，提醒工作人员进行维护；When yz*0.3≤FS<yz*0.6, it is judged that the grounding pole of the transmission tower is at the second level of corrosion, and the staff is reminded to perform maintenance; 当yz*0.6≤FS<yz*1.0时，判断为输电杆塔接地极为三级腐蚀程度，应停止工作，对输电杆塔接地极进行更换。When yz*0.6≤FS<yz*1.0, it is judged that the grounding electrode of the transmission tower is at the third level of corrosion. Work should be stopped and the grounding electrode of the transmission tower should be replaced. 2.根据权利要求1所述的一种基于超声导波的输电杆塔接地极腐蚀检测方法，其特征在于：对采集的超声信号进行噪声过滤预处理所依据的逻辑为：基于带通滤波器，设置低频截止频率和高频截止频率，其中滤波器的传递函数的具体表达式为：2. According to the method for detecting the ground electrode corrosion of a transmission tower based on ultrasonic guided waves in claim 1, it is characterized in that: the logic for noise filtering preprocessing of the collected ultrasonic signal is based on: setting a low-frequency cutoff frequency and a high-frequency cutoff frequency based on a bandpass filter, wherein the specific expression of the transfer function of the filter is: 式中，H(fs)为带通滤波器的传递函数，fs为采集到的超声信号频率，flow表示低频截止频率，fhig为高频截止频率；通过带通滤波器将传递函数H(fs)为1的超声信号进行保留，将传递函数H(fs)为0的超声信号进行舍弃。In the formula, H( fs ) is the transfer function of the bandpass filter, fs is the collected ultrasonic signal frequency, flow represents the low-frequency cutoff frequency, and fhig is the high-frequency cutoff frequency; the ultrasonic signal with the transfer function H( fs ) of 1 is retained by the bandpass filter, and the ultrasonic signal with the transfer function H( fs ) of 0 is discarded. 3.根据权利要求1所述的一种基于超声导波的输电杆塔接地极腐蚀检测方法，其特征在于：其中第k个频率分量fk计算所依据的公式为：3. According to the method for detecting the corrosion of the ground electrode of a transmission tower based on ultrasonic guided waves in claim 1, it is characterized in that: the formula for calculating the kth frequency component fk is: 式中，fz为反射信号接收传感器的采样频率；Where fz is the sampling frequency of the reflected signal receiving sensor; 第k个频率分量的幅度谱计算所依据的公式为：The formula for calculating the magnitude spectrum of the kth frequency component is: 其中，Re{α(fk)}是α(fk)的实部表示，Im{α(fk)}是α(fk)的虚部表示。Here, Re{α(f k )} is the real part of α(f k ), and Im{α(f k )} is the imaginary part of α(f k ). 4.一种基于超声导波的输电杆塔接地极腐蚀检测装置，其特征在于：所述基于超声导波的输电杆塔接地极腐蚀检测装置用于执行权利要求1-3任一项所述的基于超声导波的输电杆塔接地极腐蚀检测方法，包括：4. A transmission tower ground electrode corrosion detection device based on ultrasonic guided waves, characterized in that: the transmission tower ground electrode corrosion detection device based on ultrasonic guided waves is used to perform the transmission tower ground electrode corrosion detection method based on ultrasonic guided waves according to any one of claims 1 to 3, comprising: 超声信号采集模块，用于确定待检测输电杆塔接地极地点，在待检测输电杆塔接地极地点设置若干超声导波接收传感器，对待检测输电杆塔接地极施加超声导波，通过超声导波接收传感器采集输电杆塔接地极反射的超声信号；The ultrasonic signal acquisition module is used to determine the location of the grounding electrode of the transmission tower to be detected, set a number of ultrasonic guided wave receiving sensors at the location of the grounding electrode of the transmission tower to be detected, apply ultrasonic guided waves to the grounding electrode of the transmission tower to be detected, and collect the ultrasonic signal reflected by the grounding electrode of the transmission tower through the ultrasonic guided wave receiving sensors; 信号特征提取模块，用于对采集的超声信号进行噪声过滤预处理，基于预处理后的超声信号，对超声信号进行傅里叶变换，对变换后的信号数据进行特征提取，得到超声信号的特征参数，所述特征参数包括波峰幅度、反射时间和频率成分的平均值；A signal feature extraction module is used to perform noise filtering preprocessing on the collected ultrasonic signal, perform Fourier transform on the ultrasonic signal based on the preprocessed ultrasonic signal, perform feature extraction on the transformed signal data, and obtain feature parameters of the ultrasonic signal, wherein the feature parameters include peak amplitude, reflection time and average value of frequency components; 信号特征修正模块，用于获取待检测输电杆塔接地极周围的环境参数，基于获取的环境参数对提取的超声信号特征参数进行补偿，得到精确特征参数，其中所述环境参数包括地表温度和土壤平均湿度；A signal characteristic correction module is used to obtain environmental parameters around the grounding electrode of the transmission tower to be detected, and to compensate the extracted ultrasonic signal characteristic parameters based on the obtained environmental parameters to obtain accurate characteristic parameters, wherein the environmental parameters include surface temperature and average soil humidity; 腐蚀程度判断模块，用于基于补偿后的精确特征参数结合待检测输电杆塔接地极的接地电阻，生成腐蚀程度系数，根据计算得到的腐蚀程度系数与预先设置的腐蚀程度阈值进行比较，根据不同对比结果判断待检测输电杆塔接地极的腐蚀程度。The corrosion degree judgment module is used to generate a corrosion degree coefficient based on the compensated precise characteristic parameters combined with the grounding resistance of the grounding electrode of the transmission tower to be detected, compare the calculated corrosion degree coefficient with a preset corrosion degree threshold, and judge the corrosion degree of the grounding electrode of the transmission tower to be detected according to different comparison results.
CN202411534308.4A 2024-10-31 2024-10-31 Ultrasonic guided wave-based transmission tower grounding electrode corrosion detection method and device Active CN119024226B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202411534308.4A CN119024226B (en) 2024-10-31 2024-10-31 Ultrasonic guided wave-based transmission tower grounding electrode corrosion detection method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202411534308.4A CN119024226B (en) 2024-10-31 2024-10-31 Ultrasonic guided wave-based transmission tower grounding electrode corrosion detection method and device

Publications (2)

Publication Number Publication Date
CN119024226A CN119024226A (en) 2024-11-26
CN119024226B true CN119024226B (en) 2025-03-04

Family

ID=93534085

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202411534308.4A Active CN119024226B (en) 2024-10-31 2024-10-31 Ultrasonic guided wave-based transmission tower grounding electrode corrosion detection method and device

Country Status (1)

Country Link
CN (1) CN119024226B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119595754A (en) * 2025-01-24 2025-03-11 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 Quick-dismantling guided wave detection method for damage of grounding material of transmission tower
CN119556191B (en) * 2025-01-26 2025-08-01 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 Non-excavation detection device for transmission tower grounding grid

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202230061U (en) * 2011-09-01 2012-05-23 浙江省电力试验研究院 Special SH0 electromagnetic ultrasonic transducer for ultrasonic guided wave corrosion detection of flat steel of grounding grid
CN116773961A (en) * 2023-06-16 2023-09-19 广西电网有限责任公司电力科学研究院 Corrosion detection method for transmission lines based on high-frequency characteristics analysis of vibration signals
CN118533732A (en) * 2024-06-14 2024-08-23 宁波明峰检验检测研究院股份有限公司 Electromagnetic ultrasonic pipeline corrosion detection method, device, equipment and storage medium

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7558622B2 (en) * 2006-05-24 2009-07-07 Bao Tran Mesh network stroke monitoring appliance
CN102288533B (en) * 2011-04-27 2013-04-24 北京工业大学 Method for detecting corrosion of conductor of grounding grid of power system based on SH0 (horizontal shear) wave
CN102841143B (en) * 2012-08-29 2015-01-14 广东电网公司电力科学研究院 Method for detecting corrosion of grounded grid circular steel bar based on lateral loading of piezoelectric sensors
CN209894909U (en) * 2019-04-10 2020-01-03 武汉武高国电机电设备有限公司 Low-pressure condensation shielding room test device with partial discharge test
CN113884432A (en) * 2021-10-27 2022-01-04 国网河南省电力公司电力科学研究院 Metal down lead corrosion state detection method based on electromagnetic ultrasonic guided waves
CN113984896A (en) * 2021-11-01 2022-01-28 国网北京市电力公司 A method and device for determining the size of the ground electrode defect of a transmission tower
CN116026920A (en) * 2022-09-14 2023-04-28 国网湖北省电力有限公司超高压公司 Corrosion classification and thinning quantification method of grounded flat steel based on electromagnetic ultrasonic guided wave
CN118330045A (en) * 2024-02-27 2024-07-12 广西电网有限责任公司电力科学研究院 A multi-modal data collaborative transmission tower corrosion degree detection method and system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202230061U (en) * 2011-09-01 2012-05-23 浙江省电力试验研究院 Special SH0 electromagnetic ultrasonic transducer for ultrasonic guided wave corrosion detection of flat steel of grounding grid
CN116773961A (en) * 2023-06-16 2023-09-19 广西电网有限责任公司电力科学研究院 Corrosion detection method for transmission lines based on high-frequency characteristics analysis of vibration signals
CN118533732A (en) * 2024-06-14 2024-08-23 宁波明峰检验检测研究院股份有限公司 Electromagnetic ultrasonic pipeline corrosion detection method, device, equipment and storage medium

Also Published As

Publication number Publication date
CN119024226A (en) 2024-11-26

Similar Documents

Publication Publication Date Title
CN119024226B (en) Ultrasonic guided wave-based transmission tower grounding electrode corrosion detection method and device
Shrifan et al. Prospect of using artificial intelligence for microwave nondestructive testing technique: A review
CN103267932B (en) A kind of GIS partial discharge detection system and method
CN109649432B (en) Cloud platform rail integrity monitoring system and method based on guided wave technology
CN102183226B (en) Based on the anchor rod nondestructive testing method of Multi-source Information Fusion
CN110672875B (en) Surface water velocity detection method based on Chirp-Z transform
CN114445346A (en) A kind of power cable defect identification method and device
Chen et al. Arrival picking of acoustic emission signals using a hybrid algorithm based on AIC and histogram distance
CN107192930A (en) A kind of transformer partial discharge positioning method
CN114739669B (en) Rolling bearing state monitoring method and device based on terahertz radar
CN118897171B (en) Detection method, device, medium and system for partial discharge capability of switchgear
Tang et al. A method based on SVD for detecting the defect using the magnetostrictive guided wave technique
CN114384511A (en) A method for evaluating the contact state between layers of asphalt pavement based on three-dimensional ground penetrating radar
CN114236327A (en) Detection device and detection method for composite insulator core rod rotting defect
CN119001364A (en) Cable joint partial discharge detection method and system based on optical fiber voiceprint perception technology
Yao et al. Transmission line insulator fault detection based on ultrasonic technology
CN120044343A (en) Traveling wave cable measurement sensing method and system based on time-frequency domain combined reflection principle
CN119510576A (en) A method for defect identification of insulating components based on synthetic aperture ultrasonic imaging technology
CN106918604A (en) Cable defect detecting system and its detection method based on electromagnetic transmission lineation opinion
CN114722856A (en) Pipeline damage monitoring method and device
CN119619234A (en) A non-sensing quality tracing method for the glass fiber industry
CN206818638U (en) Cable Defect Detection System Based on Electromagnetic Wave Transmission Line Theory
CN118548832A (en) Steel thickness measurement method based on ultrasonic guided waves
Sun et al. A novel internal crack detection method for photovoltaic (PV) panels based on the air-coupled ultrasonic
CN117110438A (en) A quantitative detection method for corrosion and aging of steel structures in offshore wind farm booster stations

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant