CN112824871B - Grounding grid defect diagnosis method based on transient electromagnetic apparent resistivity imaging technology - Google Patents
Grounding grid defect diagnosis method based on transient electromagnetic apparent resistivity imaging technology Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
Abstract
The invention discloses a grounding grid defect diagnosis method based on a transient electromagnetic apparent resistivity imaging technology, which belongs to the technical field of grounding grid defect diagnosis, can realize the adoption of a transient electromagnetic method and a transient electromagnetic grounding grid corrosion detection technology, a primary pulse magnetic field is established underground by a sending coil, a secondary eddy current field is observed by using a receiving coil, the longitudinal distribution of the formation resistivity is deduced through inversion, a longitudinal resistivity profile can be formed, the resistivity obtained through calculation is compared with a simulation model which is established in advance in a simulation mode, the corrosion degree of the grounding grid is judged according to the comparison, the corrosion degree of the grounding grid of a transformer substation is evaluated, the field excavation and transformation are guided, compared with other resistivity detection methods, the transient electromagnetic method has the characteristics of strong penetrating power, high resolution, small volume effect influence, non-contact measurement and the like, and is expected to provide a new thought for solving the problems of online fault diagnosis, non-damage and non-excavation and comprehensive detection of grounding grid information.
Description
Technical Field
The invention relates to the technical field of grounding grid defect diagnosis, in particular to a grounding grid defect diagnosis method based on a transient electromagnetic apparent resistivity imaging technology.
Background
The foreign grounding grid mostly adopts a copper conductor, and the problem of corrosion and fracture is not serious, so that related research is few. While the corrosion problem of the domestic grounding grid is obvious, domestic scholars increasingly pay attention to the grounding grid fault diagnosis technology. The grounding grid belongs to underground concealed engineering, and after a backfilling process is completed in a civil engineering construction stage, visual inspection and state evaluation on the communication condition of the grounding grid and the corrosion condition of a grounding body after operation are difficult to perform. At present, the grounding resistance test is mainly adopted in the aspect of the predictability diagnosis technology of hidden defects in a transformer substation grounding grid, but because the grounding grid adopts a net-shaped structure, the communication and corrosion conditions of the grounding grid are difficult to reflect unless the grounding down device of equipment is completely disconnected with the grounding grid or the grounding grid is seriously corroded and broken in a large area, the existing detection technology has obvious defects in the aspect of diagnosis of the internal defects of the grounding grid, particularly, hidden dangers such as local breakage, series circuits, detour circuits and the like are difficult to discover, particularly in the application of actual engineering, because the measuring means of a fault point of the grounding grid is single, the actual state, the corrosion degree and the breakpoint of a conductor of the grounding grid can not be accurately judged according to the soil corrosion rate and the design topological graph of the transformer substation grounding grid only by depending on experience, and then the excavation inspection is carried out.
At present, the grounding grid defect diagnosis method mainly comprises a large current method, grounding grid node analysis, electromagnetic field analysis, an electrochemical method, a nondestructive detection method and the like. However, the current grounding grid fault diagnosis technology can only solve part of problems of grounding grid fault detection and diagnosis, and a complete solution objective should include: the non-excavation is not damaged, the efficiency is improved, and the loss is reduced; the comprehensive detection of the ground screen information comprises breakpoint, corrosion and ground screen structure detection, solves the difficult problem of no prior information, and does not need ground screen design data. The research on novel ground grid nondestructive detection means is an important subject facing the field of ground grid state detection and fault diagnosis in the future, and is also a development direction of the ground grid detection technology in the future.
The transient electromagnetic method is a geophysical method, and is characterized by that it utilizes a transmitting coil to create a primary pulse magnetic field in the ground, and during the interval of primary field, an underground eddy current field is formed and diffused downwards and outwards, so-called "smoke ring effect", and utilizes a receiving coil to observe secondary eddy current field, and utilizes inversion process to infer the longitudinal distribution of formation resistivity, so that it can form longitudinal resistivity profile. Compared with other resistivity detection methods, the transient electromagnetic method has the characteristics of strong penetration capability, high resolution, small volume effect influence, non-contact measurement and the like, and is expected to provide a new idea for solving the problems of online fault diagnosis, non-damage and non-excavation of the grounding grid and comprehensive detection of the grounding grid information.
Disclosure of Invention
1. Technical problem to be solved
The invention aims to provide a grounding grid defect diagnosis method based on a transient electromagnetic apparent resistivity imaging technology, which can realize the evaluation of the corrosion degree of a substation grounding grid by adopting a transient electromagnetic method and a transient electromagnetic grounding grid corrosion detection technology, guide the on-site excavation and transformation, carry out adaptive research on the grounding electrode corrosion detection and promote the expansion of the transient electromagnetic on the grounding electrode corrosion detection.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The grounding grid defect diagnosis method based on the transient electromagnetic apparent resistivity imaging technology comprises the following steps:
s1, planning a diagnosis route by combining a GPS (global positioning system) positioning system according to grounding grid layout data and coordinate data to be diagnosed, setting a measuring point according to a diagnosis range of transient electromagnetic diagnosis equipment, and importing the measuring point into a diagnosis unmanned aerial vehicle to generate a flight plan;
s2, carrying transient electromagnetic diagnostic equipment by the unmanned aerial vehicle according to a preset flight plan, flying to the position above a measuring point along a diagnostic route for a short stay, and starting the transient electromagnetic diagnostic equipment for diagnosis;
s3, the transient electromagnetic diagnostic equipment transmits a primary magnetic field to a measuring point through a transmitting coil, the wiring network generates an induced current under the excitation of the primary magnetic field, and the induced current excites a secondary magnetic field which is received by a receiving coil on the transient electromagnetic diagnostic equipment;
s4, analyzing and processing the received magnetic field signal to generate a longitudinal resistivity profile, comparing the resistivity obtained through calculation with a simulation model established in advance in a simulation mode, and judging the corrosion degree of the grounding grid according to the comparison result;
and S5, guiding the later-stage field excavation and transformation according to the defect judgment of the grounding grid, carrying out fixed-point accurate maintenance work, reducing the range and the workload, and improving the overall maintenance efficiency of the grounding grid.
Furthermore, the transient electromagnetic diagnostic equipment comprises a controller, the controller is connected with a transient excitation generating circuit, the output end of the transient excitation generating circuit is connected with the transmitting coil, the receiving coil is connected with a signal collecting circuit, and the signal collecting circuit is connected with a resistivity imaging module.
Furthermore, the transient excitation generating circuit comprises a transient excitation signal source, a power amplifying circuit and a first filter circuit which are connected in sequence, and the signal acquisition circuit comprises a broadband low noise amplifier, a second filter circuit and an analog-to-digital conversion circuit which are connected in sequence.
Furthermore, the controller is connected with a wireless transmission module, the wireless transmission module is connected with a cloud server, real-time and remote online data transmission and backup are facilitated, and data sharing and later-stage data analysis and processing are facilitated.
Furthermore, an electromagnetic shielding shell is fixedly installed at the lower end of the unmanned aerial vehicle, the transmitting coil comprises an upper sub-coil and a lower sub-coil which are distributed up and down, one ends of the upper sub-coil and the lower sub-coil, which are far away from each other, are respectively provided with a right free electric push rod and a left fixed electric push rod, the left fixed electric push rod is fixedly installed on the electromagnetic shielding shell, the right free electric push rod is fixedly connected with a movable plate, the upper end of the electromagnetic shielding shell is also fixedly provided with an upper fixed electric push rod, the upper fixed electric push rod is fixedly connected with the movable plate, one ends of the upper sub-coil and the lower sub-coil, which are close to each other, are fixedly connected with a plurality of self-shape-fixing stabilizing bags which are uniformly distributed, on the premise that the unmanned aerial vehicle is conveniently carried, the electromagnetic shielding shell has the functions of automatically adjusting the relative position, the distance and the current size between the upper sub-coil and the lower sub-coil, so that a primary magnetic field is constrained within a set range, the interference of a metal medium in the surrounding environment can be effectively avoided during detection, the depth is enlarged, the accuracy is improved, the diagnosis accuracy is improved, and the diagnosis efficiency is improved while the diagnosis accuracy is satisfied.
Furthermore, the self-shaping stable bag is made of a high-elasticity sealing material to form a bag body, magnetorheological fluid is filled in the self-shaping stable bag, belongs to controllable fluid and is an actively researched suspension in intelligent materials, and the magnetorheological fluid is a suspension formed by mixing high-permeability and low-magnetic-hysteresis tiny soft magnetic particles and non-magnetic-conductivity liquid, and the suspension has the characteristic of low-viscosity Newtonian fluid under the condition of zero magnetic field; under the action of a strong magnetic field, the Bingham body has the characteristics of high viscosity and low fluidity, so that the magnetic field which is strengthened and concentrated by the transmitting coil can be directly used as a driving force, the magnetorheological fluid has the solid characteristic, and the upper sub-coil and the lower sub-coil are positioned and supported after adjustment.
Furthermore, in the step S5, the simulation model established by simulation may be adjusted in real time after the field excavation verification, so as to perform real-time correction for subsequent corrosion degree diagnosis, improve the reference value of the simulation model, and further facilitate accurate diagnosis of the corrosion degree of the grounding grid.
Furthermore, the cloud server is connected with a mobile terminal, the mobile terminal comprises a mobile phone, a tablet and a PC (personal computer) terminal, so that the diagnostic data and data can be conveniently checked in real time through the mobile terminal, and the excavation and the transformation can be conveniently guided on site.
Further, the step S4 includes sending a GPS positioning signal according to the determined corrosion site of the grounding grid to obtain position information, and generating a grounding grid full line corrosion point diagram by combining with the longitudinal resistivity profile diagram, so that the corrosion diagnosis and the position information of the grounding grid are displayed in a full diagram, thereby facilitating allocation of maintenance resources and formulation of maintenance routes.
Furthermore, the corrosion degree of the corrosion points of the grounding grid is not greatly distinguished according to the shade of the same color or different colors on the full-line corrosion point bitmap of the grounding grid, so that technicians can visually and clearly know the corrosion degree of the corrosion points of the grounding grid, corresponding maintenance tasks can be conveniently formulated, and the maintenance efficiency is globally accelerated.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) According to the scheme, the corrosion degree of the transformer substation grounding grid can be evaluated by adopting a transient electromagnetic method and a transient electromagnetic grounding grid corrosion detection technology, field excavation and transformation are guided, adaptability research is carried out on grounding electrode corrosion detection, and the expansion of transient electromagnetism in grounding electrode corrosion detection is promoted.
(2) The controller is connected with a wireless transmission module, the wireless transmission module is connected with a cloud server, real-time and remote online data transmission and backup are facilitated, and data sharing and later-stage data analysis and processing are facilitated.
(3) The invention has the advantages that on the premise of carrying the unmanned aerial vehicle, the invention has the function of automatically adjusting the relative position, distance and current magnitude between the upper sub-coil and the lower sub-coil, so that the primary magnetic field is restricted in a set range, the interference of metal media in the surrounding environment can be effectively avoided during detection, the detection depth is enlarged, the accuracy of corrosion diagnosis is improved, the adjustment is convenient according to the actual field condition of the grounding grid, the diagnosis accuracy is met, and the diagnosis efficiency is improved.
(4) The self-shaping stable bag is made of a high-elasticity sealing material to form a bag body, magnetorheological fluid is filled in the self-shaping stable bag, belongs to controllable fluid and is an active research item in intelligent materials, and is a suspension formed by mixing high-permeability and low-magnetic-hysteresis tiny soft magnetic particles and non-magnetic-conductivity liquid, and the suspension has the characteristic of low-viscosity Newtonian fluid under the condition of zero magnetic field; under the action of a strong magnetic field, the Bingham body has the characteristics of high viscosity and low fluidity, so that the magnetic field which is strengthened and concentrated by the transmitting coil can be directly used as a driving force, the magnetorheological fluid has the solid characteristic, and the upper sub-coil and the lower sub-coil are positioned and supported after adjustment.
(5) The simulation model established by simulation can be adjusted in real time after the field excavation verification, the real-time correction is carried out for the subsequent corrosion degree diagnosis, the reference value of the simulation model is improved, and the accurate diagnosis of the corrosion degree of the grounding grid is further facilitated.
(6) The cloud server is connected with a mobile terminal, the mobile terminal comprises a mobile phone, a tablet and a PC (personal computer) terminal, so that diagnostic data and data can be conveniently checked in real time through the mobile terminal, and excavation and transformation can be conveniently guided on site.
(7) The invention can send out GPS positioning signals according to the judged corrosion site of the grounding grid to obtain position information, and combines with the longitudinal resistivity profile to generate the grounding grid full-line corrosion point bitmap, so that the corrosion diagnosis and the position information of the grounding grid are displayed in a full-line manner, and the allocation of maintenance resources and the formulation of maintenance routes are facilitated.
(8) The corrosion degree of the corrosion points of the grounding grid is not greatly distinguished according to the shade of the same color or different colors on the full-line corrosion point bitmap of the grounding grid, so that technicians can visually and clearly know the corrosion degree of the corrosion points of the grounding grid, corresponding maintenance tasks are conveniently formulated, and the maintenance efficiency is globally accelerated.
Drawings
FIG. 1 is a diagnostic schematic of the present invention;
FIG. 2 is a schematic diagram of a transmitter coil portion according to the present invention;
fig. 3 is a top view of a transmit coil of the present invention.
The reference numbers in the figures illustrate:
1 electromagnetic shielding shell, 2 upper sub-coil, 3 lower sub-coil, 4 left fixed electric push rod, 5 right free electric push rod, 6 moving plate, 7 upper fixed electric push rod, 8 self-shaping stabilizing capsule.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "fitted/connected", "connected", and the like, are to be interpreted broadly, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1, the method for diagnosing the defects of the grounding grid based on the transient electromagnetic apparent resistivity imaging technology comprises the following steps:
s1, planning a diagnosis route by combining a GPS (global positioning system) positioning system according to grounding grid layout data and coordinate data to be diagnosed, setting a measuring point according to a diagnosis range of transient electromagnetic diagnosis equipment, and importing the measuring point into a diagnosis unmanned aerial vehicle to generate a flight plan;
s2, carrying transient electromagnetic diagnosis equipment by the unmanned aerial vehicle according to a preset flight plan, flying to the position above a measuring point along a diagnosis route for a short time, and starting the transient electromagnetic diagnosis equipment for diagnosis;
s3, the transient electromagnetic diagnostic equipment transmits a primary magnetic field to a measuring point through a transmitting coil, the wiring network generates an induced current under the excitation of the primary magnetic field, and the induced current excites a secondary magnetic field which is received by a receiving coil on the transient electromagnetic diagnostic equipment;
s4, analyzing and processing the received magnetic field signal to generate a longitudinal resistivity sectional diagram, comparing the resistivity obtained through calculation with a simulation model established in advance in a simulation mode, and judging the corrosion degree of the grounding grid according to the comparison result;
s5, guiding later-stage on-site excavation and transformation according to the defect judgment of the grounding grid, carrying out fixed-point accurate maintenance work, reducing the range and the workload, and improving the overall maintenance efficiency of the grounding grid.
Transient electromagnetism diagnostic equipment includes the controller, and the controller is connected with transient excitation and produces the circuit, and the output and the transmitting coil of transient excitation production circuit are connected, and receiving coil is connected with signal acquisition circuit, and signal acquisition circuit is connected with resistivity imaging module, and transient excitation production circuit is including the transient excitation signal source, power amplification circuit and the first filter circuit that connect gradually, and signal acquisition circuit is including the broadband low noise amplifier, second filter circuit and the analog-to-digital conversion circuit that connect gradually.
The controller is connected with wireless transmission module, and wireless transmission module is connected with the cloud ware, and the real-time long-range online data transmission and the backup of being convenient for are carried out, the data sharing of being convenient for and the data analysis processing in later stage, and the cloud ware is connected with mobile terminal, and mobile terminal includes but not only is limited to cell-phone, flat board and PC end, conveniently looks over diagnostic data and data through mobile terminal in real time, conveniently guides excavation and transformation at the scene.
Referring to fig. 2, an electromagnetic shielding shell 1 is fixedly installed at the lower end of the unmanned aerial vehicle, a transmitting coil comprises an upper sub-coil 2 and a lower sub-coil 3 which are distributed up and down, and can realize convergence and reinforcement of a magnetic field to a designated area after adjustment, a right free electric push rod 5 and a left fixed electric push rod 4 are respectively installed at one end of the upper sub-coil 2 and one end of the lower sub-coil 3 which are far away from each other, the left fixed electric push rod 4 is fixedly installed on the electromagnetic shielding shell 1, a moving plate 6 is fixedly connected to the right free electric push rod 5, an upper fixed electric push rod 7 is also fixedly installed at the upper end of the electromagnetic shielding shell 1, the upper fixed electric push rod 7 is fixedly connected with the moving plate 6, the upper sub-coil 2 and the lower sub-coil 3 are close to each other, and a plurality of self-shaped stabilizing capsules 8 which are uniformly distributed are fixedly connected to one end of each other, so that the unmanned aerial vehicle can be conveniently carried, the functions of automatically adjusting the relative position, the distance and the current magnitude between the upper sub-coil 2 and the lower sub-coil 3 are further, so that a primary magnetic field is restrained in a set range, and interference of metal media in the surrounding environment can be effectively avoided during detection, the depth is enlarged, the accuracy of corrosion diagnosis is improved, and the accuracy of the diagnosis can be improved.
The self-shaping stabilizing bag 8 is made of a high-elasticity sealing material to form a bag body, magnetorheological fluid is filled in the self-shaping stabilizing bag 8, belongs to controllable fluid and is an actively researched suspension in intelligent materials, the magnetorheological fluid is a suspension formed by mixing small soft magnetic particles with high magnetic conductivity and low magnetic hysteresis and non-magnetic conductive liquid, and the suspension has the characteristic of low-viscosity Newtonian fluid under the condition of zero magnetic field; under the action of a strong magnetic field, the Bingham body has the characteristics of high viscosity and low fluidity, so that the magnetic field which is strengthened and concentrated by the transmitting coil can be directly used as a driving force, the magnetorheological liquid has the solid characteristic, and the upper sub-coil 2 and the lower sub-coil 3 are positioned and supported after adjustment.
In the step S5, the simulation model established by simulation can be adjusted in real time after the field excavation verification, and the real-time correction is carried out for the subsequent corrosion degree diagnosis, so that the reference value of the simulation model is improved, and the accurate diagnosis of the corrosion degree of the grounding grid is facilitated.
And step S4, sending a GPS positioning signal according to the judged corrosion site of the grounding grid to acquire position information, and combining the position information with the longitudinal resistivity profile to generate a grounding grid full-line corrosion point bitmap, so that the corrosion diagnosis and the position information of the grounding grid are displayed in a full-line manner, the allocation of maintenance resources and the establishment of maintenance routes are facilitated, the grounding grid full-line corrosion point bitmap is distinguished according to the corrosion degree of the grounding grid corrosion points according to different shades or different colors, technicians can visually and clearly know the corrosion degree of the grounding grid corrosion points, corresponding maintenance tasks are facilitated, and the maintenance efficiency is accelerated globally.
The method can realize the evaluation of the corrosion degree of the transformer substation grounding grid by adopting a transient electromagnetic method and a transient electromagnetic grounding grid corrosion detection technology, guide the field excavation and transformation, carry out adaptive research on the grounding electrode corrosion detection and promote the development of the transient electromagnetic on the grounding electrode corrosion detection.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (9)
1. The grounding grid defect diagnosis method based on the transient electromagnetic apparent resistivity imaging technology is characterized by comprising the following steps of: the method comprises the following steps:
s1, planning a diagnosis route by combining a GPS positioning system according to grounding grid layout data and coordinate data to be diagnosed, setting a measuring point according to a diagnosis range of transient electromagnetic diagnosis equipment, and importing the measuring point into a diagnosis unmanned aerial vehicle to generate a flight plan;
s2, carrying transient electromagnetic diagnosis equipment by the diagnosis unmanned aerial vehicle according to a preset flight plan, flying to the position above a measuring point along a diagnosis route for a short time, and starting the transient electromagnetic diagnosis equipment for diagnosis;
s3, the transient electromagnetic diagnostic equipment transmits a primary magnetic field to the measuring point through a transmitting coil, the wiring network generates an induced current under the excitation of the primary magnetic field, and the induced current excites a secondary magnetic field to be received by a receiving coil on the transient electromagnetic diagnostic equipment;
s4, analyzing and processing the received magnetic field signal to generate a longitudinal resistivity sectional diagram, comparing the resistivity obtained through calculation with a simulation model established in advance in a simulation mode, and judging the corrosion degree of the grounding grid according to the comparison result;
s5, guiding later-stage on-site excavation and transformation according to the defect judgment of the grounding network, and carrying out fixed-point accurate maintenance work, so that the range is reduced, the workload is reduced, and the overall maintenance efficiency of the grounding network is improved;
the diagnosis unmanned aerial vehicle lower extreme fixed mounting has electromagnetic shield shell (1), transmitting coil includes last sub-coil (2) and lower sub-coil (3) that distribute from top to bottom, the one end of going up sub-coil (2) and lower sub-coil (3) keeping away from each other installs right free electric putter (5) and left fixed electric putter (4) respectively, and left fixed electric putter (4) fixed mounting on electromagnetic shield shell (1), right free electric putter (5) fixedly connected with movable plate (6), electromagnetic shield shell (1) upper end still fixed mounting has last fixed electric putter (7), and goes up fixed electric putter (7) and movable plate (6) between fixed connection, go up sub-coil (2) and lower sub-coil (3) and be close to one end fixedly connected with a plurality of evenly distributed's from the stable bag of stereotyping (8) each other.
2. The grounding grid defect diagnosis method based on the transient electromagnetic apparent resistivity imaging technology is characterized in that: the transient electromagnetic diagnosis equipment comprises a controller, wherein the controller is connected with a transient excitation generating circuit, the output end of the transient excitation generating circuit is connected with a transmitting coil, a receiving coil is connected with a signal acquisition circuit, and the signal acquisition circuit is connected with a resistivity imaging module.
3. The grounding grid defect diagnosis method based on the transient electromagnetic apparent resistivity imaging technology as claimed in claim 2, wherein: the transient excitation generating circuit comprises a transient excitation signal source, a power amplifying circuit and a first filter circuit which are sequentially connected, and the signal collecting circuit comprises a broadband low-noise amplifier, a second filter circuit and an analog-to-digital conversion circuit which are sequentially connected.
4. The grounding grid defect diagnosis method based on the transient electromagnetic apparent resistivity imaging technology is characterized in that: the controller is connected with a wireless transmission module, and the wireless transmission module is connected with a cloud server.
5. The grounding grid defect diagnosis method based on the transient electromagnetic apparent resistivity imaging technology is characterized in that: the self-shaping stabilizing bag (8) is made of a high-elasticity sealing material to form a bag body, and magnetorheological liquid is filled in the self-shaping stabilizing bag (8).
6. The grounding grid defect diagnosis method based on the transient electromagnetic apparent resistivity imaging technology as claimed in claim 1, wherein: in the step S5, the simulation model established by simulation may be adjusted in real time after the field excavation verification, so as to perform real-time correction for subsequent corrosion degree diagnosis.
7. The grounding grid defect diagnosis method based on the transient electromagnetic apparent resistivity imaging technology is characterized in that: the cloud server is connected with a mobile terminal, and the mobile terminal comprises a mobile phone, a tablet and a PC (personal computer) terminal.
8. The grounding grid defect diagnosis method based on the transient electromagnetic apparent resistivity imaging technology is characterized in that: and the step S4 also comprises the steps of sending a GPS positioning signal according to the judged corrosion site of the grounding grid to obtain position information, and generating a full-line corrosion site bitmap of the grounding grid by combining the position information with the longitudinal resistivity profile.
9. The grounding grid defect diagnosis method based on the transient electromagnetic apparent resistivity imaging technology, as claimed in claim 8, wherein: and distinguishing according to the corrosion degree of the corrosion points of the grounding grid on the grounding grid full-line corrosion point bitmap and according to the shade of the same color or different colors.
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