A non-contact substation grounding grid state detection method and system

Abstract

The application relates to the technical field of power equipment detection, in particular to a non-contact substation grounding grid state detection method and system, which comprises the following steps: acquiring a to-be-tested region, and dividing the to-be-tested region to obtain a plurality of test sub-regions. Simulated current testing is performed on the plurality of test sub-regions to obtain the theoretical current unit value corresponding to each branch of the substation grounding grid in each test sub-region. Actual test data is collected, and the corrosion state of each branch of the substation grounding grid in each test sub-region is evaluated based on the actual current data and the theoretical current unit value, so that the branch corrosion state is obtained. The application improves the corrosion state detection efficiency of the substation grounding grid and reduces the damage of the substation grounding grid in the detection.

Description

Technical Field

[0001] This application relates to the technical field of power equipment testing, and in particular to a non-contact method and system for detecting the condition of substation grounding grids. Background Technology

[0002] The power system grounding grid is a crucial infrastructure component of the power system, bearing the important responsibility of ensuring personnel safety, preventing damage to power equipment, and guaranteeing the stable operation of the power system. In recent years, with the advancement of new power system construction, the integration of renewable energy, ultra-high voltage transmission, and DC transmission, the power system architecture has become increasingly complex, and various types of power equipment are becoming more densely packed. This places increasingly higher demands on the grounding grid to ensure the safety of personnel and equipment. Any quality issues with the grounding grid can pose a serious threat to the safety of personnel and power equipment, as well as the stable operation of the power system. Therefore, it is necessary to regularly assess and maintain the health status of the grounding grid to ensure that it remains in an effective working condition.

[0003] Currently, the health status assessment of grounding grids in China mainly adopts a combination of three methods: first, using a grounding impedance tester to measure the overall grounding impedance of the grounding grid; second, using a continuity tester to assess the good conductivity between the grounding down conductors of each power device and the grounding grid; and third, periodically selecting sites for excavation to assess the degree of corrosion of the grounding grid conductors. This method has the following problems:

[0004] It cannot reflect the full health status of the grounding grid. First, many factors affect the grounding impedance of the grounding grid. The magnitude of the overall impedance value of the grounding grid cannot determine the degree of corrosion of the grounding grid conductor, let alone whether there are any breaks. It also cannot determine whether the grounding grid topology structure is strictly constructed according to the design drawings, whether the burial depth meets the requirements, or whether the grounding grid area meets the design requirements. Second, the selected excavation point can only evaluate the health status of the grounding grid at the excavation point. The unexcavated area accounts for the majority of the area, and its health status is unknown. It can only be inferred by comparing with the excavation point, which is inaccurate.

[0005] The operation is cumbersome and labor-intensive. Measuring grounding impedance requires laying wires outside the substation, with a length 4-5 times the diagonal of the substation's grounding grid. The voltage electrode needs to be moved three times during the test to check the accuracy of the impedance measurement. This cumbersome operation makes it unsuitable for use in urban areas. Assessing the corrosion of the grounding grid conductors can only be done through excavation, but the use of large machinery is limited inside substations, forcing excavation work to be done manually, resulting in high labor intensity.

[0006] Location is difficult during excavation. The health status of the grounding grid in old substations needs special attention. Due to their age, the grounding grid drawings for old substations are often paper documents, which are likely to be missing. Expansion and renovation of substations will cause changes to the grounding grid, but the drawings will not be updated accordingly. As a result, there are no drawings to refer to when excavation is needed to test and assess the health status of the grounding grid in old substations. Even if the drawings are complete and match the actual topology, it is very difficult to match the dimensions marked on the drawings to the actual location of the grounding grid on site. In most cases, the excavation work is in a state of "blind excavation".

[0007] Therefore, how to improve the efficiency of substation grounding grid corrosion detection while ensuring non-destructive methods has become an urgent technical problem to be solved. Summary of the Invention

[0008] To address at least one of the aforementioned technical problems, this application provides a non-contact substation grounding grid status detection method and system.

[0009] Firstly, this application provides a non-contact substation grounding grid status detection method, which adopts the following technical solution:

[0010] The area to be tested is obtained and divided into multiple sub-areas. The area to be tested is the area covered by the substation grounding grid to be tested for corrosion status.

[0011] Simulated current tests were performed on the multiple test sub-regions to obtain the theoretical per-unit current values ​​corresponding to each branch of the substation grounding grid in each test sub-region.

[0012] Collect actual test data, which are the actual current data corresponding to each branch of the substation grounding network in each test sub-area within a preset time period;

[0013] Based on the actual current data and the theoretical current per-unit value, the corrosion status of each branch of the substation grounding grid in each test sub-region is evaluated to obtain the corrosion status of the branch.

[0014] By adopting the above technical solution, the area to be tested is obtained and divided into multiple test sub-areas. This measure can accurately locate different detection positions of the substation grounding network, providing a clear scope for subsequent testing and making the testing more targeted and systematic. Without excavating the substation grounding wires, simulated current tests are performed on multiple test sub-areas to obtain theoretical current per-unit values. These theoretical values ​​serve as a standard reference, laying the foundation for subsequent comparison with actual data. They help clarify the expected state of current in each branch under normal conditions and are an important reference for assessing corrosion status. Actual current data of each branch of the substation grounding network in each test sub-area is collected within a preset time. Actual current data reflects the current situation of the grounding network under real operating conditions, including the influence of various factors. Combined with the theoretical current per-unit values, the actual current status of each branch of the grounding network can be comprehensively and accurately reflected, providing real and effective data support for subsequent corrosion status assessment based on the comparison of the two, ensuring that the assessment results are more consistent with the actual situation. Based on the actual current data and the theoretical current per-unit values, the corrosion status of each branch of the substation grounding network in each test sub-area is assessed to obtain the branch corrosion status. The difference between the actual current and the theoretical value can directly reflect whether there are any abnormalities in the branch, and thus infer the corrosion situation. This assessment method can accurately identify the corrosion status of each branch of the grounding grid, promptly detect potential safety hazards, and ensure the stable operation of the substation grounding grid.

[0015] In one possible implementation, the division of the region to be tested into multiple test sub-regions includes:

[0016] Obtain grounding grid drawing information, which is used to represent the line distribution information and line attribute parameters of the substation grounding wires during pre-embedding;

[0017] A three-dimensional model of the grounding grid is constructed based on the grounding grid drawing information, and the three-dimensional model of the grounding grid is combined with the area to be tested to obtain a test area model;

[0018] Based on the test area model, determine whether the grounding grid area distribution structure is a divisible structure. If so, divide the test area model into multiple sub-area models and determine multiple test sub-areas based on the multiple sub-area models.

[0019] If the grounding grid area distribution structure is not evenly divisible, then the diagonal points of the test area model are determined, auxiliary lines are drawn according to the diagonal points, and it is determined whether the intersection point of multiple auxiliary lines is unique. If it is unique, then two-dimensional coordinates are drawn with the intersection point as the origin, and the sub-region models located in different quadrants are defined as test sub-regions.

[0020] In one possible implementation, the simulated current test of the plurality of test sub-regions to obtain the theoretical per-unit current value corresponding to each branch of the substation grounding grid within each test sub-region includes:

[0021] According to the preset point selection rules, point selection is performed for each test sub-region to obtain the excitation current injection point and excitation current lead-out point corresponding to each test sub-region.

[0022] A current control command is generated based on the excitation current injection point and the excitation current lead-out point to control the excitation current to flow in from the excitation current injection point and out from the excitation current lead-out point;

[0023] Collect the ground surface magnetic induction intensity and latitude and longitude data corresponding to each test sub-region, and organize the ground magnetic induction intensity and latitude and longitude data to obtain the detection data table corresponding to each test sub-region;

[0024] Based on the distribution law of magnetic induction intensity, the location of the grounding grid branch corresponding to each test sub-region is obtained by performing a location analysis on the detection data table.

[0025] Based on the location of the grounding grid branches and the grounding grid drawing information, a grounding grid topology model is performed to obtain a grounding grid model.

[0026] The grounding grid model is simulated and analyzed to obtain a circuit simulation model;

[0027] Based on the circuit simulation model, the per-unit current value of each branch of the substation grounding grid in each test sub-region is calculated to obtain the theoretical per-unit current value.

[0028] In one possible implementation, the corrosion status assessment of each branch of the substation grounding grid within each test sub-region is performed based on the actual current data and the theoretical current per-unit value to obtain the branch corrosion status, including:

[0029] The actual current per-unit value is determined based on the actual current data, and the branch current change rate is obtained by calculating the actual current per-unit value and the theoretical current per-unit value.

[0030] The branch current change rate is input into the grounding grid corrosion status assessment standard for status assessment, and the branch corrosion status corresponding to each branch in each test sub-region is obtained.

[0031] In one possible implementation, determining whether the intersection point of the multiple auxiliary lines is unique further includes:

[0032] If the intersection points of multiple auxiliary lines are not unique, the distance lines between the intersection points and each diagonal point in the test area model, as well as the distance values ​​corresponding to the distance lines, are calculated. The distance difference between adjacent distance lines is calculated based on the distance values, and the average of the distance differences is calculated to generate a comprehensive distance value corresponding to each intersection point. The intersection point corresponding to the smallest comprehensive distance value is used as the origin for two-dimensional coordinate drawing, and the sub-region models located in different quadrants are defined as test sub-regions.

[0033] In one possible implementation, the step of performing simulation modeling analysis on the grounding grid model to obtain a circuit simulation model includes:

[0034] Based on the grounding grid drawing information, determine the cross-sectional area, resistivity, and length of the grounding electrode conductor of each branch of the substation grounding grid;

[0035] The cross-sectional area of ​​the grounding electrode conductor, the resistivity, and the length are input into a preset resistance formula for calculation to obtain the resistance value of each branch of the substation grounding network;

[0036] The resistance value is bound to the branch in the grounding grid model to form a circuit simulation model.

[0037] In one possible implementation, the step of assessing the corrosion status of each branch of the substation grounding grid within each test sub-region based on the actual current data and the theoretical current per-unit value to obtain the branch corrosion status further includes:

[0038] The grounding grid model is labeled according to the corrosion status of the branch, and the labeled grounding grid model is controlled and displayed on a preset terminal device.

[0039] Secondly, this application provides a non-contact substation grounding grid status detection system, which adopts the following technical solution:

[0040] A non-contact substation grounding grid status detection system includes:

[0041] The area division module is used to acquire the area to be tested and divide the area to be tested into multiple test sub-areas. The area to be tested is the area covered by the substation grounding grid to be tested for corrosion status.

[0042] The simulation test module is used to perform simulated current tests on the multiple test sub-regions to obtain the theoretical per-unit current value corresponding to each branch of the substation grounding grid in each test sub-region.

[0043] The data acquisition module is used to collect actual test data, which is the actual current data corresponding to each branch of the substation grounding network in each test sub-area within a preset time.

[0044] The corrosion assessment module is used to assess the corrosion status of each branch of the substation grounding grid in each test sub-region based on the actual current data and the theoretical current per-unit value, and to obtain the corrosion status of the branch.

[0045] In one possible implementation, when the region division module divides the region to be tested into multiple test sub-regions, it is specifically used for:

[0046] Obtain grounding grid drawing information, which is used to represent the line distribution information and line attribute parameters of the substation grounding wires during pre-embedding;

[0047] A three-dimensional model of the grounding grid is constructed based on the grounding grid drawing information, and the three-dimensional model of the grounding grid is combined with the area to be tested to obtain a test area model;

[0048] Based on the test area model, determine whether the grounding grid area distribution structure is a divisible structure. If so, divide the test area model into multiple sub-area models and determine multiple test sub-areas based on the multiple sub-area models.

[0049] If the grounding grid area distribution structure is not evenly divisible, then the diagonal points of the test area model are determined, auxiliary lines are drawn according to the diagonal points, and it is determined whether the intersection point of multiple auxiliary lines is unique. If it is unique, then two-dimensional coordinates are drawn with the intersection point as the origin, and the sub-region models located in different quadrants are defined as test sub-regions.

[0050] In another possible implementation, when the simulation test module performs simulated current tests on the multiple test sub-regions to obtain the theoretical per-unit current value corresponding to each branch of the substation grounding grid in each test sub-region, it is specifically used for:

[0051] According to the preset point selection rules, point selection is performed for each test sub-region to obtain the excitation current injection point and excitation current lead-out point corresponding to each test sub-region.

[0052] A current control command is generated based on the excitation current injection point and the excitation current lead-out point to control the excitation current to flow in from the excitation current injection point and out from the excitation current lead-out point;

[0053] Collect the ground surface magnetic induction intensity and latitude and longitude data corresponding to each test sub-region, and organize the ground magnetic induction intensity and latitude and longitude data to obtain the detection data table corresponding to each test sub-region;

[0054] Based on the distribution law of magnetic induction intensity, the location of the grounding grid branch corresponding to each test sub-region is obtained by performing a location analysis on the detection data table.

[0055] Based on the location of the grounding grid branches and the grounding grid drawing information, a grounding grid topology model is performed to obtain a grounding grid model.

[0056] The grounding grid model is simulated and analyzed to obtain a circuit simulation model;

[0057] Based on the circuit simulation model, the per-unit current value of each branch of the substation grounding grid in each test sub-region is calculated to obtain the theoretical per-unit current value.

[0058] In another possible implementation, when the corrosion assessment module assesses the corrosion status of each branch of the substation grounding grid in each test sub-region based on the actual current data and the theoretical current per-unit value, and obtains the branch corrosion status, it is specifically used for:

[0059] The actual current per-unit value is determined based on the actual current data, and the branch current change rate is obtained by calculating the actual current per-unit value and the theoretical current per-unit value.

[0060] The branch current change rate is input into the grounding grid corrosion status assessment standard for status assessment, and the branch corrosion status corresponding to each branch in each test sub-region is obtained.

[0061] In another possible implementation, the system further includes: a region definition module, wherein,

[0062] The region definition module is used to calculate the distance line between the intersection point and each diagonal point in the test region model, and the distance value corresponding to the distance line, when the intersection point of multiple auxiliary lines is not unique. It calculates the distance difference between adjacent distance lines based on the distance value, and calculates the average of the distance differences to generate a comprehensive distance value corresponding to each intersection point. It uses the intersection point corresponding to the smallest comprehensive distance value as the origin for two-dimensional coordinate drawing and defines the sub-region models located in different quadrants as test sub-regions.

[0063] In another possible implementation, when the simulation test module performs simulation modeling analysis on the grounding grid model to obtain a circuit simulation model, it is specifically used for:

[0064] Based on the grounding grid drawing information, determine the cross-sectional area, resistivity, and length of the grounding electrode conductor of each branch of the substation grounding grid;

[0065] The cross-sectional area of ​​the grounding electrode conductor, the resistivity, and the length are input into a preset resistance formula for calculation to obtain the resistance value of each branch of the substation grounding network;

[0066] The resistance value is bound to the branch in the grounding grid model to form a circuit simulation model.

[0067] In another possible implementation, the system further includes: a label display module, wherein,

[0068] The annotation and display module is used to annotate the grounding grid model according to the corrosion status of the branch, and control the display of the annotated grounding grid model on a preset terminal device.

[0069] Thirdly, this application provides an electronic device that adopts the following technical solution:

[0070] At least one processor;

[0071] Memory;

[0072] At least one application, wherein the at least one application is stored in memory and configured to be executed by at least one processor, the at least one application being configured to: perform a non-contact substation grounding grid status detection method as described in any of the first aspects.

[0073] Fourthly, this application provides a computer-readable storage medium, which adopts the following technical solution:

[0074] A computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to perform a non-contact substation grounding grid status detection method as described in any of the first aspects.

[0075] In summary, this application includes at least one of the following beneficial technical effects:

[0076] The process of identifying the test area and dividing it into multiple sub-test areas allows for precise location of different testing positions in the substation grounding grid, providing a clear scope for subsequent testing and making the testing more targeted and systematic. Without excavating the substation grounding wires, simulated current tests are performed in multiple sub-test areas to obtain theoretical per-unit current values. These theoretical values ​​serve as a standard reference, laying the foundation for subsequent comparison with actual data and helping to clarify the expected current state of each branch under normal conditions. This is an important reference for assessing corrosion status. Actual current data for each branch of the substation grounding grid in each test sub-test area is collected within a preset time period. This actual current data reflects the current situation of the grounding grid under real operating conditions, including the influence of various factors. Combined with the theoretical per-unit current values, this comprehensively and accurately reflects the actual current status of each branch of the grounding grid, providing real and effective data support for subsequent corrosion status assessment based on a comparison of the two, ensuring that the assessment results are more consistent with reality. Based on the actual current data and theoretical per-unit current values, the corrosion status of each branch of the substation grounding grid in each test sub-test area is assessed to obtain the branch corrosion status. The difference between the actual current and the theoretical value can intuitively reflect whether there are any abnormalities in the branch, thus inferring the corrosion situation. This assessment method can accurately identify the corrosion status of each branch of the grounding grid, promptly detect potential safety hazards, and ensure the stable operation of the substation grounding grid. Attached Figure Description

[0077] Figure 1 This is a flowchart illustrating a non-contact substation grounding grid status detection method provided in an embodiment of this application.

[0078] Figure 2 This is a schematic diagram of a non-contact substation grounding grid status detection system provided in an embodiment of this application.

[0079] Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0080] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0081] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of this application.

[0082] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0083] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0084] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0085] This application provides a method for non-contact substation grounding grid status detection, executed by an electronic device. This electronic device can be a standalone physical electronic device, a cluster of multiple physical electronic devices, a distributed system, or a cloud electronic device providing cloud computing services. This application does not impose any limitations on this method. Figure 1 As shown, the method includes:

[0086] Step S10: Obtain the area to be tested and divide it into multiple test sub-areas.

[0087] The area to be tested is the area covered by the substation grounding grid that is to be inspected for corrosion.

[0088] In this embodiment, grounding grid drawing information is obtained. The grounding grid drawing information is used to represent the line distribution information and line attribute parameters of the substation grounding wire during pre-burial. A three-dimensional model of the grounding grid is constructed based on the grounding grid drawing information, and the three-dimensional model of the grounding grid is combined with the area to be tested to obtain a test area model. The test area model is used to determine whether the distribution structure of the grounding grid area is a divisible structure. If so, the test area model is divided equally to generate multiple sub-area models, and multiple test sub-areas are determined based on the multiple sub-area models. If the distribution structure of the grounding grid area is not divisible, the diagonal points of the test area model are determined, auxiliary lines are drawn according to the diagonal points, and it is determined whether the intersection point of multiple auxiliary lines is unique. If unique, two-dimensional coordinates are drawn with the intersection point as the origin, and the sub-area models located in different quadrants are defined as test sub-areas.

[0089] In addition, when the intersection points of multiple auxiliary lines are not unique, the distance lines between the intersection points and each diagonal point in the test area model, as well as the distance values ​​corresponding to the distance lines, are calculated. The distance difference between adjacent distance lines is calculated based on the distance values, and the average of the distance differences is calculated to generate the comprehensive distance value corresponding to each intersection point. The intersection point corresponding to the minimum comprehensive distance value is used as the origin for two-dimensional coordinate drawing, and the sub-region models located in different quadrants are defined as test sub-regions.

[0090] Specifically, line distribution information refers to the spatial orientation and connection relationships of each line during the pre-burying process of substation grounding wires. Line attribute parameters are used to represent parameters affecting the electrical performance and physical characteristics of the grounding wire, such as its material, specifications (e.g., diameter), and resistivity. For example, a grounding grid drawing will clearly indicate that a certain grounding wire starts from point A in the substation, passes through points B and C, and finally reaches point D. It will also specify that this grounding wire is made of galvanized steel, has a diameter of 10 mm, and a specific resistivity. A 3D grounding grid model is a virtual model constructed using 3D modeling technology based on the obtained grounding grid drawing information. This model can intuitively display the shape and structure of the grounding grid in three-dimensional space. A test area model is a model obtained by combining the 3D grounding grid model with the area to be tested, comprehensively considering the actual situation of the grounding grid within the test area. A uniformly divisible structure means that the grounding grid area distribution structure can be evenly divided into multiple parts according to certain rules and standards. An indivisible structure means that the grounding grid area distribution structure cannot be evenly divided. Diagonal points refer to the locations of two opposite corners in the test area model. Auxiliary lines are lines formed by connecting pairwise diagonal points. Intersection points are the points where multiple auxiliary lines intersect.

[0091] In this embodiment, a high-precision scanner is used to scan the grounding grid diagram into an electronic image. Image recognition software is then used to process the image, extracting the line distribution and attribute parameters. During scanning, it is essential to ensure the diagram is flat and the scanning resolution is sufficiently high. The image recognition software automatically identifies lines and text in the image and converts them into an editable data format.

[0092] Step S11: Perform simulated current tests on multiple test sub-regions to obtain the theoretical per-unit current value corresponding to each branch of the substation grounding grid in each test sub-region.

[0093] Specifically, points are selected for each test sub-region according to preset point selection rules, resulting in the corresponding excitation current injection point and excitation current extraction point. Current control commands are generated based on these points to control the excitation current to flow in from the injection point and out from the extraction point. Ground surface magnetic induction intensity and latitude / longitude data are collected for each test sub-region, and this data is processed to obtain a detection data table for each sub-region. The location of the detection data table is analyzed based on the magnetic induction intensity distribution pattern to obtain the location of the grounding grid branch for each sub-region. Grounding grid topology modeling is performed based on the branch locations and grounding grid drawing information to obtain the grounding grid model. Simulation modeling analysis is then performed on the grounding grid model to obtain a circuit simulation model. Based on the circuit simulation model, the per-unit current values ​​for each branch of the substation grounding grid within each test sub-region are calculated to obtain the theoretical per-unit current values.

[0094] The process involves simulating and modeling the grounding grid to obtain a circuit simulation model. This includes determining the cross-sectional area, resistivity, and length of the grounding electrode conductors for each branch of the substation grounding grid based on the grounding grid drawings. The cross-sectional area, resistivity, and length of the grounding electrode conductors are then input into a preset resistance formula for calculation to obtain the resistance values ​​for each branch of the substation grounding grid. These resistance values ​​are then mapped to the corresponding branches in the grounding grid model to construct the circuit simulation model.

[0095] In this embodiment, the preset point selection rule is the diagonal point and the origin point of the coordinate system as described above. Since the coordinate system divides the test area into four test sub-regions, each sub-region corresponds to two points: a diagonal point and the origin point. When performing an excitation current test on the first test area, the current is introduced from the diagonal point within the first test area and then drawn out from the origin point. When performing an excitation current test on the second test area, the current is introduced from the origin point and then drawn out from the diagonal point within the second test area. When performing an excitation current test on the third test area, the current is introduced from the diagonal point within the third test area and then drawn out from the origin point. When performing an excitation current test on the fourth test area, the current is introduced from the origin point and then drawn out from the diagonal point within the fourth test area.

[0096] After completing the excitation current test described above, the magnetic flux density and latitude / longitude location data of the excitation current on the ground surface are acquired using a mobile detection device. Specifically, according to Biot-Savart's law, the magnetic flux density generated by the axial current in the grounding grid conductor can be expressed as: ,in, The magnetic flux density is the magnetic field strength induced at a point on the ground surface by the axial current of the horizontal grounding electrode, expressed in tons (T). Permeability in vacuum, in h / m; This represents the axial current of the horizontal grounding electrode, measured in amperes (A). denoted as a tiny line element representing the axial current of the horizontal grounding electrode, and r as the position vector between the axial element of the horizontal grounding electrode and the point on the ground surface, in meters.

[0097] According to the above formulas, the spatial magnetic induction intensity is directly proportional to the axial current of the grounding electrode and inversely proportional to the position vector, while the conductor's impedance is inversely proportional to its cross-sectional area. Therefore, the measured value of magnetic induction intensity reflects the change in the conductor's cross-sectional area caused by corrosion and other factors. The distribution of magnetic induction intensity on the surface of the substation grounding grid exhibits a clear regularity: the spatial magnetic induction intensity is higher near the conductor; it decreases rapidly further away from the conductor; due to the superposition effect of the magnetic induction intensities of each conductor, the magnetic induction intensity value near the conductor node differs slightly from that at the conductor center; the change in surface magnetic induction intensity along the conductor is relatively gradual, with no abrupt changes in a single conductor. Based on this regularity, the magnetic induction intensity data above the ground of the grounding electrode can be extracted, and the location of the horizontal grounding electrode and the burial depth of the grounding electrode in the substation grounding grid can be determined using relevant algorithms, i.e., the location of the grounding grid branch corresponding to each test sub-area.

[0098] In this embodiment, the cross-sectional area, resistivity, and length of the grounding electrode conductor are input into a preset resistance formula for calculation to obtain the resistance values ​​of each branch of the substation grounding grid. The preset resistance formula is as follows: Where R is resistance, ρ is resistivity, l is conductor length, and S is conductor cross-sectional area. After obtaining the resistance values ​​of each branch, simulations are performed on each region according to the different locations where the excitation current is introduced, and the theoretical per-unit current values ​​of each branch in the grounding grid model are obtained.

[0099] Step S12: Collect actual test data.

[0100] The actual test data consists of the actual current data corresponding to each branch of the substation grounding network within each test sub-area within a preset time period.

[0101] In this embodiment of the application, an automatic monitoring system is installed in the substation grounding grid to collect current data from each branch in real time. First, suitable automatic monitoring equipment, such as intelligent current sensors and data acquisition devices, is selected and installed on each branch of the substation grounding grid. Then, a data transmission network is established to transmit the data collected by the monitoring equipment to this system in real time, thereby achieving the acquisition of actual test data.

[0102] Step S13: Based on the actual current data and the theoretical per-unit current value, evaluate the corrosion status of each branch of the substation grounding grid in each test sub-region to obtain the corrosion status of the branch.

[0103] Specifically, the actual per-unit value of the current is determined based on the actual current data, and the actual per-unit value of the current is calculated with the theoretical per-unit value of the current to obtain the branch current change rate. The branch current change rate is then input into the grounding grid corrosion status assessment standard for status assessment to obtain the branch corrosion status corresponding to each branch in each test sub-region.

[0104] In this embodiment, the branch current change rate is calculated as follows: the actual per-unit current value and the theoretical per-unit current value are calculated to obtain the per-unit current difference. Then, the per-unit current difference is used as the numerator, and the ideal per-unit current value is used as the denominator to calculate the branch current change rate. Based on the corrosion state corresponding to different current change rate ranges in the grounding grid corrosion state assessment standard, the branch corrosion state corresponding to the branch current change rate is determined. Finally, the grounding grid model is labeled according to the branch corrosion state, and the labeled grounding grid model is displayed on a preset terminal device.

[0105] This application provides a non-contact substation grounding grid status detection method. The method acquires the test area and divides it into multiple test sub-areas. This approach accurately locates different detection positions in the substation grounding grid, providing a clear scope for subsequent testing and making the detection more targeted and systematic. Without excavating the substation grounding wires, simulated current tests are performed on multiple test sub-areas to obtain theoretical current per-unit values. These theoretical values ​​serve as a standard reference, laying the foundation for subsequent comparison with actual data. They help clarify the expected current state of each branch under normal conditions and are an important reference for assessing corrosion status. Actual current data of each branch of the substation grounding grid in each test sub-area is collected within a preset time. The actual current data reflects the current situation of the grounding grid under real operating conditions, including the influence of various factors. Combined with the theoretical current per-unit values, it comprehensively and accurately reflects the actual current status of each branch of the grounding grid, providing real and effective data support for subsequent corrosion status assessment based on the comparison of the two, ensuring that the assessment results are more consistent with reality. Based on the actual current data and the theoretical current per-unit values, the corrosion status of each branch of the substation grounding grid in each test sub-area is assessed to obtain the branch corrosion status. The difference between the actual current and the theoretical value can directly reflect whether there are any abnormalities in the branch, and thus infer the corrosion situation. This assessment method can accurately identify the corrosion status of each branch of the grounding grid, promptly detect potential safety hazards, and ensure the stable operation of the substation grounding grid.

[0106] The following describes a non-contact substation grounding grid status detection system provided in an embodiment of this application. The non-contact substation grounding grid status detection system described below can be referred to in conjunction with the non-contact substation grounding grid status detection method described above. Figure 2 , Figure 2This is a schematic diagram of the structure of a non-contact substation grounding grid status detection system 20 provided in an embodiment of this application, including:

[0107] The area division module 21 is used to obtain the area to be tested and divide the area to be tested into multiple test sub-areas. The area to be tested is the area covered by the substation grounding grid to be tested for corrosion status.

[0108] The simulation test module 22 is used to perform simulated current tests on multiple test sub-regions to obtain the theoretical per-unit current value corresponding to each branch of the substation grounding grid in each test sub-region.

[0109] Data acquisition module 23 is used to acquire actual test data, which is the actual current data of each branch of the substation grounding network in each test sub-area within a preset time.

[0110] The corrosion assessment module 24 is used to assess the corrosion status of each branch of the substation grounding grid in each test sub-region based on actual current data and theoretical current per-unit values, and obtain the corrosion status of the branch.

[0111] In one possible implementation of this application embodiment, when the region division module 21 divides the region to be tested into multiple test sub-regions, it is specifically used for:

[0112] Obtain grounding grid drawing information, which is used to represent the line distribution information and line attribute parameters of the substation grounding wires during pre-embedding.

[0113] A three-dimensional model of the grounding grid is constructed based on the grounding grid drawings, and the three-dimensional model of the grounding grid is combined with the area to be tested to obtain the test area model;

[0114] Based on the test area model, determine whether the grounding grid area distribution structure is a divisible structure. If so, divide the test area model into multiple sub-area models and determine multiple test sub-areas based on the multiple sub-area models.

[0115] If the grounding grid area distribution is not evenly divided, then determine the diagonal points of the test area model, draw auxiliary lines according to the diagonal points, and determine whether the intersection point of multiple auxiliary lines is unique. If it is unique, then draw two-dimensional coordinates with the intersection point as the origin, and define the sub-region model located in different quadrants as the test sub-region.

[0116] In another possible implementation of this application embodiment, when the simulation test module 22 performs simulated current tests on multiple test sub-regions to obtain the theoretical per-unit current value corresponding to each branch of the substation grounding grid in each test sub-region, it is specifically used for:

[0117] According to the preset point selection rules, point selection is performed for each test sub-region to obtain the excitation current injection point and excitation current lead-out point corresponding to each test sub-region.

[0118] A current control command is generated based on the excitation current injection point and the excitation current lead-out point to control the excitation current to flow in from the excitation current injection point and out from the excitation current lead-out point;

[0119] Collect the ground surface magnetic induction intensity and latitude and longitude data corresponding to each test sub-region, and organize the ground magnetic induction intensity and latitude and longitude data to obtain the detection data table corresponding to each test sub-region;

[0120] Based on the distribution law of magnetic induction intensity, the location of the grounding grid branch corresponding to each test sub-region is obtained by performing a location analysis on the test data table;

[0121] Based on the location of the grounding grid branches and the information in the grounding grid drawings, a grounding grid topology model is obtained;

[0122] The grounding grid model is simulated and analyzed to obtain the circuit simulation model;

[0123] Based on the circuit simulation model, the per-unit current value of each branch of the substation grounding grid in each test sub-region is calculated to obtain the theoretical per-unit current value.

[0124] In another possible implementation of this application embodiment, when the corrosion assessment module 24 assesses the corrosion status of each branch of the substation grounding grid in each test sub-region based on actual current data and theoretical current per-unit values, and obtains the branch corrosion status, it is specifically used for:

[0125] The actual per-unit value of the current is determined based on the actual current data, and the per-unit value of the actual current is calculated with the theoretical per-unit value to obtain the branch current change rate.

[0126] The branch current change rate is input into the grounding grid corrosion status assessment standard for status assessment, and the branch corrosion status corresponding to each branch in each test sub-region is obtained.

[0127] In another possible implementation of this application embodiment, system 20 further includes: a region definition module, wherein...

[0128] The region definition module is used to calculate the distance lines between the intersection points of multiple auxiliary lines and each diagonal point in the test region model, as well as the distance values ​​corresponding to the distance lines, when the intersection points of multiple auxiliary lines are not unique. It calculates the distance difference between adjacent distance lines based on the distance values, and calculates the average of the distance differences to generate the comprehensive distance value corresponding to each intersection point. The intersection point corresponding to the minimum comprehensive distance value is used as the origin for two-dimensional coordinate drawing, and the sub-region models located in different quadrants are defined as test sub-regions.

[0129] In another possible implementation of this application embodiment, when the simulation test module 22 performs simulation modeling analysis on the grounding grid model to obtain the circuit simulation model, it is specifically used for:

[0130] Determine the cross-sectional area, resistivity, and length of the grounding electrode conductor of each branch of the substation grounding grid based on the grounding grid drawings;

[0131] The cross-sectional area, resistivity, and length of the grounding electrode conductor are input into a preset resistance formula for calculation to obtain the resistance value of each branch of the substation grounding network.

[0132] By binding the resistance values ​​to the branches in the grounding grid model, a circuit simulation model is obtained.

[0133] In another possible implementation of this application embodiment, system 20 further includes: a label display module, wherein,

[0134] The annotation and display module is used to annotate the grounding grid model according to the corrosion status of the branches, and control the display of the annotated grounding grid model on the preset terminal device.

[0135] This application provides an electronic device, such as... Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 3 The illustrated electronic device 300 includes a processor 301 and a memory 303. The processor 301 and the memory 303 are connected, for example, via a bus 302. Optionally, the electronic device 300 may also include a transceiver 304. It should be noted that in practical applications, the transceiver 304 is not limited to one type, and the structure of this electronic device 300 does not constitute a limitation on the embodiments of this application.

[0136] Processor 301 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in connection with the embodiments of this application. Processor 301 may also be a combination that implements computing functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0137] Bus 302 may include a pathway for transmitting information between the aforementioned components. Bus 302 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 302 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 3 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0138] The memory 303 may be a ROM (Read-Only Memory) or other type of static storage device capable of storing static information and instructions, RAM (Random Access Memory) or other type of dynamic storage device capable of storing information and instructions, or it may be an EEPROM (Electrically Erasable Programmable Read-Only Memory), a CD-ROM (Compact Disc Read-Only Memory) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto.

[0139] The memory 303 is used to store application code that executes the scheme of the embodiments of this application, and its execution is controlled by the processor 301. The processor 301 is used to execute the application code stored in the memory 303 to implement the content shown in the foregoing method embodiments.

[0140] Among them, electronic devices include, but are not limited to: mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), and in-vehicle terminals (such as in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 3 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0141] The following describes a computer-readable storage medium provided by an embodiment of this application. The computer-readable storage medium described below can be referred to in correspondence with the method described above.

[0142] This application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the steps of the above-described non-contact substation grounding grid status detection method.

[0143] Since the embodiments of the computer-readable storage medium portion correspond to the embodiments of the method portion, please refer to the description of the embodiments of the method portion for the embodiments of the computer-readable storage medium portion.

[0144] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0145] The above are only some embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A non-contact substation grounding grid state detection method, characterized in that, The method comprises the following steps: acquiring a to-be-tested region, and dividing the to-be-tested region to obtain a plurality of test sub-regions, the to-be-tested region being a region covered by a grounding grid of a substation to be subjected to corrosion state detection; the step of dividing the to-be-tested region to obtain a plurality of test sub-regions comprises: acquiring grounding grid drawing information, the grounding grid drawing information being used to represent line distribution information and line attribute parameters of a grounding line of the substation during pre-burial; constructing a grounding grid three-dimensional model according to the grounding grid drawing information, and combining the grounding grid three-dimensional model with the to-be-tested region to obtain a test region model; determining whether the grounding grid region distribution structure is a divisible structure according to the test region model, if yes, dividing the test region model to generate a plurality of sub-region models, and determining a plurality of test sub-regions according to the plurality of sub-region models; if the grounding grid region distribution structure is a non-divisible structure, determining diagonal point positions of the test region model, drawing auxiliary lines according to the diagonal point positions, and determining whether intersection points of the auxiliary lines are unique, if yes, performing two-dimensional coordinate drawing with the intersection points as origins, and defining sub-region models located in different quadrants as test sub-regions; if the intersection points of the auxiliary lines are not unique, calculating distance lines between the intersection points and each diagonal point position in the test region model and distance values corresponding to the distance lines, calculating distance difference values between adjacent distance lines according to the distance values, and performing average calculation on the distance difference values to generate a comprehensive distance value corresponding to each intersection point, performing two-dimensional coordinate drawing with the intersection point corresponding to the minimum comprehensive distance value as an origin, and defining sub-region models located in different quadrants as test sub-regions; performing simulated current testing on the plurality of test sub-regions to obtain theoretical current unit values of each branch of the grounding grid of the substation in each test sub-region; collecting actual testing data, the actual testing data being actual current data of each branch of the grounding grid of the substation in each test sub-region within a preset time; performing corrosion state evaluation on each branch of the grounding grid of the substation in each test sub-region based on the actual current data and the theoretical current unit values to obtain a branch corrosion state.

2. The non-contact substation grounding grid state detection method according to claim 1, characterized in that, the step of performing simulated current testing on the plurality of test sub-regions to obtain theoretical current unit values of each branch of the grounding grid of the substation in each test sub-region comprises: selecting points in each test sub-region according to a preset point selection rule to obtain an excitation current injection point and an excitation current extraction point corresponding to each test sub-region; generating a current control instruction according to the excitation current injection point and the excitation current extraction point, and controlling excitation current to flow in from the excitation current injection point and flow out from the excitation current extraction point; collecting ground surface magnetic induction intensity and latitude and longitude data corresponding to each test sub-region, and arranging the ground surface magnetic induction intensity and the latitude and longitude data to obtain a detection data table corresponding to each test sub-region; According to the magnetic induction intensity distribution law, the detection data table is analyzed to obtain a grounding net branch position corresponding to each test sub-region; Based on the grounding net branch position and the grounding net drawing information, a grounding net topology model is established to obtain a grounding net model; The grounding net model is simulated and analyzed to obtain a circuit simulation model; According to the circuit simulation model, a current per unit value of each branch of the grounding net in each test sub-region is calculated to obtain a theoretical current per unit value.

3. The non-contact substation grounding grid state detection method according to claim 1, characterized in that, According to the actual current data and the theoretical current per unit value, the corrosion state of each branch of the grounding net in each test sub-region is evaluated to obtain a branch corrosion state, including: An actual current per unit value is determined according to the actual current data, and the actual current per unit value and the theoretical current per unit value are calculated to obtain a branch current change rate; The branch current change rate is input into a grounding net grid corrosion state evaluation standard to evaluate the state, and the branch corrosion state corresponding to each branch in each test sub-region is obtained.

4. The non-contact substation grounding grid state detection method according to claim 2, characterized in that, The grounding net model is simulated and analyzed to obtain a circuit simulation model, including: According to the grounding net drawing information, the cross-sectional area, resistivity and length of the grounding electrode conductor of each branch of the grounding net are determined; The cross-sectional area, resistivity and length of the grounding electrode conductor are input into a preset resistance formula to calculate the resistance value of each branch of the grounding net; The resistance value is correspondingly bound to the branch in the grounding net model to obtain a circuit simulation model.

5. The non-contact substation grounding grid state detection method according to claim 1, characterized in that, According to the actual current data and the theoretical current per unit value, the corrosion state of each branch of the grounding net in each test sub-region is evaluated to obtain a branch corrosion state, and then further including: According to the branch corrosion state, the grounding net model is labeled, and the labeled grounding net model is displayed on a preset terminal device.

6. A non-contact substation grounding grid state detection system characterized by, Including: A region division module is configured to obtain a to-be-tested region, divide the to-be-tested region to obtain a plurality of test sub-regions, and the to-be-tested region is a region covered by a grounding net of a substation to be tested for corrosion state; When the region division module divides the to-be-tested region to obtain a plurality of test sub-regions, it is specifically configured to: Obtain grounding net drawing information, which is used to represent the line distribution information and line attribute parameters of the grounding net of the substation during pre-burial; According to the grounding net drawing information, a grounding net three-dimensional model is constructed, and the grounding net three-dimensional model is combined with the to-be-tested region to obtain a test region model; According to the test region model, it is determined whether the grounding net region distribution structure is a divisible structure, if yes, the test region model is divided to generate a plurality of sub-region models, and a plurality of test sub-regions are determined according to the plurality of sub-region models; If the grounding grid area distribution structure is a non-uniform distribution structure, diagonal point positions of the test area model are determined, auxiliary lines are drawn according to the diagonal point positions, and it is determined whether the intersection points of the auxiliary lines are unique, if the intersection points are unique, two-dimensional coordinates are drawn with the intersection points as the origin, and sub-area models in different quadrants are defined as test sub-areas; The system further comprises an area definition module, wherein, When the intersection points of the auxiliary lines are not unique, the area definition module is configured to calculate distance lines between the intersection points and each diagonal point position in the test area model and distance values corresponding to the distance lines, calculate distance difference values between adjacent distance lines according to the distance values, and calculate a comprehensive distance value corresponding to each intersection point by performing a mean value calculation on the distance difference values, and perform two-dimensional coordinate drawing with the intersection point corresponding to the minimum comprehensive distance value as the origin, and define sub-area models in different quadrants as test sub-areas; The simulation test module is configured to perform a simulation current test on the plurality of test sub-areas to obtain a theoretical current unit value corresponding to each branch of the grounding grid of the substation in each test sub-area; The data acquisition module is configured to acquire actual test data, which is actual current data corresponding to each branch of the grounding grid of the substation in each test sub-area within a preset time; The corrosion evaluation module is configured to evaluate the corrosion state of each branch of the grounding grid of the substation in each test sub-area based on the actual current data and the theoretical current unit value to obtain a branch corrosion state.

7. An electronic device, comprising: The electronic device includes: at least one processor; a memory; at least one application program, wherein the at least one application program is stored in the memory and is configured to be executed by the at least one processor, and the at least one application program is configured to execute a non-contact substation grounding grid state detection method according to any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, including: a computer program stored in the memory and capable of being loaded and executed by the processor to perform a non-contact substation grounding grid state detection method according to any one of claims 1-5.

Images