Method and system for measuring grounding resistance of carbon fiber composite grounding body

Abstract

The application discloses a carbon fiber composite grounding body grounding resistance measurement method and system, and relates to the technical field of grounding resistance measurement, wherein the method comprises the following steps: acquiring electrical signal data of each test point prearranged on a carbon fiber composite grounding body, pre-processing the electrical signal data to generate an initial resistance measurement data set; performing multi-dimensional decoupling processing on the initial resistance measurement data set to generate an electrode core body resistance component, a conductive solidification layer body resistance component and a grounding body-soil contact resistance component; constructing a carbon fiber composite grounding body grounding resistance correlation model according to the electrode core body resistance component, the conductive solidification layer body resistance component and the grounding body-soil contact resistance component; and performing checking processing on the design parameters of the carbon fiber composite grounding body based on the carbon fiber composite grounding body grounding resistance correlation model to obtain grounding resistance checking data. The application can overcome the defects that the prior art cannot measure resistance in layers and is difficult to judge the rationality of parameters.

Description

Technical Field

[0001] This invention relates to the field of grounding resistance measurement technology, specifically to a method and system for measuring the grounding resistance of carbon fiber composite grounding bodies. Background Technology

[0002] The grounding system of transmission line towers is a critical infrastructure for ensuring the safe and stable operation of the power grid. Its core function is to rapidly discharge lightning current and fault current to the ground, preventing line tripping and equipment damage. Traditional grounding systems generally use metal grounding materials such as flat steel, stainless steel, and copper-clad steel. However, these materials have inherent defects: First, they do not have a tight contact with the soil, resulting in high contact resistance. In areas with high soil resistivity, the laying length and the amount of resistance-reducing material need to be significantly increased. Second, they are susceptible to soil corrosion. Even with anti-corrosion coatings, pitting corrosion can occur due to construction wear and welding defects, leading to a gradual increase in grounding resistance over the years. Their service life is usually only 10-15 years, which is difficult to match the design life of transmission lines of more than 50 years.

[0003] To address the aforementioned issues, carbon fiber composite grounding electrodes have emerged. In particular, recycled carbon fiber composite pointed metal mesh grounding electrodes, using a multi-pointed metal mesh as the conductive core, employ recycled carbon fiber, recycled aggregate, and geopolymer cementitious materials to form the outer conductive structure. They possess advantages such as high conductivity, strong corrosion resistance, and low carbon footprint, exhibiting good adhesion to soil, effectively reducing contact resistance, and boasting a service life exceeding 50 years. This has become an important development direction for next-generation grounding materials. However, with the large-scale application of these composite grounding electrodes, the development of supporting grounding resistance measurement technology has lagged behind, becoming a bottleneck restricting product quality control and design optimization.

[0004] Chinese patent document CN113655285A relates to the field of grounding resistance measurement technology, disclosing a method for measuring the grounding resistance of transmission line towers. It obtains measurement impedance data through the loop impedance method and uses a BP neural network model to predict measurement errors at different frequencies for calibration. Although this method can effectively suppress power frequency interference and improve the measurement accuracy of the traditional clamp meter method, it is designed for the overall grounding resistance measurement of traditional metal grounding bodies. It does not consider the multi-layer composite structure characteristics of carbon fiber composite grounding bodies, and cannot separately measure the resistance of the multi-pointed metal mesh core, the resistance of the conductive curing layer, and the grounding body-soil contact resistance. Furthermore, it cannot accurately test critical connection points such as connection holes.

[0005] Chinese patent document CN121164725A relates to the field of grounding resistance measurement technology, disclosing a method and system for measuring the grounding resistance of transmission line towers. This method involves simultaneously injecting the same electrical signal into two lightning protection wires to suppress circulating current between them and extracting the ground current component to calculate the grounding resistance. Although this method eliminates the need for auxiliary grounding electrodes, is easy to operate, and allows for live online measurement, it only obtains the total resistance value of the entire tower grounding system. It cannot distinguish the resistance contribution of each layer within a single carbon fiber composite grounding body, nor is it suitable for performance testing and parameter verification of individual products during the production stage.

[0006] Chinese patent document CN121703509A relates to the field of grounding resistance measurement technology, disclosing a method for measuring the grounding resistance of transmission towers based on distributed sensing of the ground potential field. This method reconstructs the ground potential field distribution by deploying a ground potential sensing network and uses a graph neural network model to identify grounding resistance and diagnose local faults. Although this method can achieve non-contact distributed measurement and detect defects such as local fractures and corrosion in the grounding electrode, it is designed for the overall design of the existing grounding grid, requiring the deployment of a large number of sensing nodes on-site. This results in long measurement cycles and high costs, failing to meet the needs of rapid batch testing on production lines. Furthermore, it cannot accurately obtain the resistance parameters of each layer within a single composite grounding electrode to guide design optimization.

[0007] In summary, existing grounding resistance measurement technologies are all designed for traditional metal grounding electrodes or existing grounding grids, without considering the multi-layered composite structure of recycled carbon fiber composite pointed metal mesh grounding electrodes. This leads to the following technical problems in the design and production stages: Firstly, the lack of dedicated standardized test point designs makes it impossible to accurately separate and measure the resistance of the multi-pointed metal mesh core, the resistance of the conductive curing layer, and the grounding electrode-soil contact resistance. Secondly, it is impossible to quantitatively evaluate the rationality of design parameters such as the conductivity, diameter, connecting hole diameter, and the ratio of recycled carbon fiber to the geopolymer curing layer using measured data. This results in difficulty in effectively controlling the consistency of product batch performance and a lack of scientific data support for design optimization. Summary of the Invention

[0008] The purpose of this invention is to provide a method for measuring the grounding resistance of carbon fiber composite grounding bodies, so as to overcome the shortcomings of existing technologies that cannot measure resistance in layers and are difficult to evaluate the rationality of parameters.

[0009] The objective of this invention is achieved through the following technical solution: This invention provides a method for measuring the grounding resistance of a carbon fiber composite grounding electrode, comprising: Acquire electrical signal data at each test point on the carbon fiber composite grounding electrode, and preprocess the electrical signal data to generate an initial resistance measurement dataset. The test points include connection hole test points, multi-point metal mesh electrode core test points, and conductive curing layer test points. The initial resistance measurement dataset is subjected to multi-dimensional decoupling processing to generate the core body resistance component, the conductive solidification layer body resistance component, and the grounding body-soil contact resistance component. Based on the resistance components of the core body, the resistance components of the conductive curing layer body, and the resistance components of the grounding electrode-soil contact, a grounding resistance correlation model for carbon fiber composite grounding electrode is constructed. Based on the grounding resistance correlation model of the carbon fiber composite grounding electrode, the design parameters of the carbon fiber composite grounding electrode are checked to obtain grounding resistance verification data.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention enables independent acquisition of electrical signals from different layers of the carbon fiber composite grounding electrode through three dedicated test points: a pre-set connection hole test point, a multi-point metal mesh electrode core test point, and a conductive curing layer test point, providing a foundation for layered resistance measurement. Through multi-dimensional decoupling processing, the total grounding resistance is decomposed into three independent components: the electrode core resistance component, the conductive curing layer resistance component, and the grounding electrode-soil contact resistance component, solving the problem of existing technologies being unable to perform layered resistance measurement. By constructing a grounding resistance correlation model for the carbon fiber composite grounding electrode, a quantitative relationship between design parameters and the resistance components of each layer can be established, allowing for quantitative verification of the rationality of design parameters using measured data. Analysis of grounding resistance verification data can assess the performance consistency of products in the same batch and provide targeted design optimization guidance for problems existing in each layer, solving the problems of difficulty in controlling product batch performance consistency and lack of data support for design optimization. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0012] Figure 1 This is a flowchart of a method for measuring the grounding resistance of a carbon fiber composite grounding electrode according to an embodiment of the present invention; Figure 2 This is a top sectional view of a carbon fiber composite grounding body according to an embodiment of the present invention; Figure 3 This is a front sectional view of a carbon fiber composite grounding body according to an embodiment of the present invention; Figure 4This is a schematic diagram of the preparation process of the carbon fiber composite grounding body according to an embodiment of the present invention; In the picture: 1. Connecting hole; 2. Multi-point metal mesh core; 3. Conductive curing layer. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments. The following embodiments are provided to better understand the present invention and are not intended to limit the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0014] Example 1 like Figures 1-4 As shown, this invention provides a method for measuring the grounding resistance of a carbon fiber composite grounding electrode, comprising the following steps: Step 1: Acquire electrical signal data at each test point on the carbon fiber composite grounding electrode. Preprocess the electrical signal data to generate an initial resistance measurement dataset. The test points include connection hole test points, multi-point metal mesh core test points, and conductive curing layer test points. In specific implementation, test points can be preset at three key locations on the carbon fiber composite grounding electrode: connection hole test points, multi-point metal mesh core test points, and conductive curing layer test points. The connection hole test point is located on the inner wall of connection hole 1, the multi-point metal mesh core test point is located on multi-point metal mesh core 2, and the conductive curing layer test point is located on the outer surface of conductive curing layer 3. Connect the test cables to the detection modules at the three test points respectively, inject excitation current with preset amplitude and frequency into each test point, and synchronously collect the potential signals at each test point to obtain the raw electrical signal data. The raw electrical signal data is preprocessed by filtering, denoising, and outlier removal to remove the effects of power frequency interference and contact noise. The processed electrical signal data is then converted into resistance values ​​to generate an initial resistance measurement dataset.

[0015] Step 2: Perform multi-dimensional decoupling processing on the initial resistance measurement dataset to generate the core resistance component, the conductive solidified layer resistance component, and the grounding electrode-soil contact resistance component. Specifically, based on the initial resistance measurement dataset, a three-layered impedance matrix can be constructed, where rows represent different test points, columns represent different excitation points, and matrix elements represent the impedance value of the corresponding test point when current is injected at the corresponding excitation point. By extracting submatrices and calculating eigenvalues ​​from the three-layered impedance matrix, the core resistance component and the conductive solidified layer resistance component are separated. Then, by subtracting the core resistance component and the conductive solidified layer resistance component from the total impedance, the original grounding electrode-soil interface impedance data is obtained. This original interface impedance data is then corrected using parameters such as the surface resistivity of the conductive solidified layer and the soil resistivity to generate the grounding electrode-soil contact resistance component.

[0016] Step 3: Construct a grounding resistance correlation model for the carbon fiber composite grounding electrode based on the resistance components of the electrode core, the conductive curing layer, and the grounding electrode-soil contact resistance. Specifically, mapping relationships can be established between the electrode core design parameters and their resistance components, the conductive curing layer design parameters and their resistance components, and the grounding electrode-soil interface design parameters and their grounding electrode-soil contact resistance components. Based on these mapping relationships, the electrode core resistance sub-model, the conductive curing layer resistance sub-model, and the grounding electrode-soil contact resistance sub-model are trained respectively. Considering the influence of interlayer conduction coupling and interface conduction coupling, interlayer conduction coupling coefficients and interface conduction coupling coefficients are introduced to weighted couple the three sub-models, generating an initial grounding resistance correlation model. The initial grounding resistance correlation model is verified and optimized using measured data from different batches and specifications of carbon fiber composite grounding electrodes to improve the model's generalization ability, ultimately generating the carbon fiber composite grounding electrode grounding resistance correlation model.

[0017] Step 4: Based on the grounding resistance correlation model of the carbon fiber composite grounding electrode, the design parameters of the carbon fiber composite grounding electrode are checked to obtain grounding resistance verification data. Specifically, the design parameters of the carbon fiber composite grounding electrode to be checked can be obtained, including the material, diameter, and mesh size of the multi-pointed metal mesh core, the composition and thickness of the conductive curing layer, and the surface area of ​​the grounding electrode. These design parameters are input into the carbon fiber composite grounding electrode grounding resistance correlation model to predict the theoretical core resistance component, the theoretical conductive curing layer resistance component, and the theoretical grounding electrode-soil contact resistance component. The theoretical resistance components are compared with the corresponding measured resistance components to calculate the deviation values ​​of each layer's parameters. Based on the influence of each layer's parameter deviation on the total grounding resistance, different weighting coefficients are set, and the parameter deviations of each layer are weighted and combined to obtain a comprehensive parameter deviation value. The comprehensive parameter deviation value is compared with a preset parameter deviation threshold to determine whether the design parameters meet the requirements, and grounding resistance verification data is generated.

[0018] Preferably, the method for measuring the grounding resistance of a carbon fiber composite grounding electrode provided by the present invention further includes: Step 5: Based on the grounding resistance verification data, generate batch performance consistency assessment results and design optimization guidance information for carbon fiber composite grounding electrodes. In specific implementation, the grounding resistance verification data of all carbon fiber composite grounding electrodes within the same batch can be layered and decomposed to extract the core parameter deviation set, conductive curing layer parameter deviation set, and grounding electrode-soil interface parameter deviation set respectively. Calculate the dispersion data of each layer's parameter deviation set, including standard deviation and coefficient of variation. Based on the magnitude of the dispersion data, classify the batch consistency of each layer into different levels, generating core batch consistency data, conductive curing layer batch consistency data, and grounding electrode-soil interface batch consistency data. Combining the batch consistency data of each layer, match the corresponding design parameter optimization direction to generate core design optimization data, conductive curing layer design optimization data, and grounding electrode-soil interface design optimization data. Integrate the above batch consistency data and design optimization data to generate batch performance consistency assessment results and design optimization guidance information for carbon fiber composite grounding electrodes.

[0019] Based on the above design, this invention can achieve independent measurement of the resistance components of each layer of the carbon fiber composite grounding electrode, accurately analyze the impact of each layer on the grounding performance, quantify the rationality of the design parameters through measured data, provide a scientific basis for product design, evaluate the performance consistency of products in the same batch, improve the level of product quality control, and provide targeted design optimization guidance information to accelerate product iteration.

[0020] Optionally, the step of acquiring electrical signal data at each test point preset on the carbon fiber composite grounding electrode, and preprocessing the electrical signal data to generate an initial resistance measurement dataset, includes: Step 11: Perform data acquisition configuration processing on each test point to generate test point data acquisition configuration information; Step 12: Based on the configuration information of the test points, inject layered differential excitation into each test point, synchronously collect potential differences and eliminate interference to form electrical signal data of each test point preset on the carbon fiber composite grounding body. Step 13: Perform hierarchical feature mapping and cross-layer consistency verification on the electrical signal data of each test point to form a consistency verification passed dataset; Step 14: Normalize the dimensions of the consistency verification dataset to form an initial resistance measurement dataset. Specifically, a minimum-maximum normalization method can be used to map each resistance characteristic value to the [0,1] interval, eliminating dimensional differences between resistance characteristic values ​​at different levels. The normalized resistance characteristic values ​​are then organized according to the test point level and acquisition sequence to generate the initial resistance measurement dataset.

[0021] Based on the above design, this invention adopts a hierarchical differential excitation injection and potential difference synchronous acquisition method, which can reduce the impact of power frequency interference and inter-layer coupling; hierarchical feature mapping and cross-layer consistency verification are performed on the acquired electrical signal data, which can improve the reliability of the data; and dimensional normalization processing of the data can eliminate the dimensional differences between data at different levels.

[0022] Preferably, the step of performing data acquisition configuration processing on each test point to generate test point data acquisition configuration information includes: Step 111: Based on the conductive layer level corresponding to each test point, perform layer marking processing on each test point to generate test point layer marking information. In specific implementation, the three-layer conductive structure of the carbon fiber composite grounding body can be designed from the inside out as a multi-pointed metal mesh core layer, a conductive curing layer, and a soil layer. Connecting hole 1 is welded to the middle of the multi-pointed metal mesh core 2 and belongs to the same conductive layer as the multi-pointed metal mesh core 2; the conductive curing layer 3 covers the outer surface of the multi-pointed metal mesh core 2 and belongs to the middle conductive layer; the soil layer belongs to the outer conductive layer. Based on the above conductive layer level division, the test point with the connecting hole is marked as layer 1, the test point with the multi-pointed metal mesh core is marked as layer 2, and the test point with the conductive curing layer is marked as layer 3, generating test point layer marking information.

[0023] Step 112: Based on the test point level marking information, pair test points in adjacent levels to form adjacent level test point pairing information. Specifically, based on the test point level marking information, select test point combinations belonging to different levels with a level difference of 1. Pair the connection hole test point of level 1 with the multi-tip metal mesh core test point of level 2 to measure the contact resistance between the connection hole and the multi-tip metal mesh core. Pair the multi-tip metal mesh core test point of level 2 with the conductive curing layer test point of level 3 to measure the interlayer resistance between the multi-tip metal mesh core and the conductive curing layer, as well as the bulk resistance of the conductive curing layer. Organize the above pairing results to generate adjacent level test point pairing information.

[0024] Step 113: Generate test point acquisition configuration information based on the adjacent level test point pairing information. In specific implementation, the injection end and acquisition end of the excitation current can be determined for each pair of adjacent level test point pairing information. For the pairing of the connection hole test point and the multi-tipped metal mesh core test point, the excitation current injection end is set at the connection hole test point, and the potential difference acquisition end is set at the multi-tipped metal mesh core test point; for the pairing of the multi-tipped metal mesh core test point and the conductive curing layer test point, the excitation current injection end is set at the multi-tipped metal mesh core test point, and the potential difference acquisition end is set at the conductive curing layer test point. For example, the amplitude of the excitation current is set to 10mA-100mA, and the frequency is set to 1kHz-10kHz to reduce the influence of power frequency interference. The sampling frequency of the potential difference acquisition is set to more than 10 times the frequency of the excitation current to ensure the integrity of the acquired signal. The above excitation current parameters, acquisition parameters, and pairing information are integrated to generate the test point acquisition configuration information.

[0025] Based on the above design, this invention marks the test points according to the conductive layer level, which can clearly identify the level to which each test point belongs; it pairs test points of adjacent levels to achieve layered excitation and layered acquisition; and it generates targeted acquisition configuration information based on the pairing information to improve the rationality of the configuration.

[0026] Preferably, the step of performing layered differential excitation injection, potential difference synchronous acquisition, and interference rejection processing on each test point based on the test point configuration information to generate electrical signal data preset on each test point on the carbon fiber composite grounding electrode includes: Step 121: Based on the test point acquisition configuration information, inject layered differential excitation into the paired test points of adjacent layers to form a layered differential excitation response field. Specifically, differential excitation current can be injected into the paired test points of adjacent layers according to the excitation current injection terminal determined in the test point acquisition configuration information. The differential excitation current uses two currents with equal amplitude and opposite phase, injected into the two paired test points respectively. The electric fields generated by the differential excitation current inside the carbon fiber composite grounding body are superimposed to form a layered differential excitation response field. This response field can be concentrated between two adjacent conductive layers, reducing interference from other layers on the measurement results and improving the accuracy of layered resistance measurement.

[0027] Step 122: Based on the layered differential excitation response field, synchronously acquire the potential differences of paired test points at adjacent levels to form an original potential difference set between test points. Specifically, based on the layered differential excitation response field, synchronous acquisition processing can be performed on the potential differences between paired test points at adjacent levels to generate the original potential difference set between test points. Preferably, the specific implementation process of this step is as follows: While injecting the differential excitation current, the potential difference signal between two paired test points at adjacent levels is synchronously acquired through a potential difference acquisition device. The trigger signal of the acquisition device is synchronized with the injection signal of the excitation current to ensure that the acquired potential difference signal corresponds to the excitation current at all times. For each group of paired test points at adjacent levels, multiple acquisitions are performed to obtain multiple potential difference signals. All acquired potential difference signals are classified and organized according to the test point pairing information to generate an original potential difference set between test points.

[0028] Step 123: Align the timing of the original potential difference set between the test points according to the preset excitation timing sequence to form a timing-aligned potential difference set. Specifically, the preset excitation timing sequence can be a sequence of injection times of the excitation current, with each injection time corresponding to an excitation current pulse. Extract the timestamp of each potential difference signal from the original potential difference set between the test points and match the timestamp with the injection times in the preset excitation timing sequence. For each excitation current pulse, select the potential difference signal with the closest timestamp as the response signal corresponding to that pulse. Arrange all matched potential difference signals according to the excitation timing sequence to generate a timing-aligned potential difference set.

[0029] Step 124: Filter out power frequency interference and contact noise from the time-aligned potential difference set to form electrical signal data preset at each test point on the carbon fiber composite grounding electrode. Specifically, a digital notch filter can be used to process the potential difference signal in the time-aligned potential difference set to filter out power frequency interference of 50Hz and its harmonics. A moving average filtering algorithm is used to process the potential difference signal after filtering out power frequency interference to remove random fluctuations caused by contact noise. Outlier detection is performed on the processed potential difference signal to remove abnormal signals exceeding a preset threshold range. The remaining valid potential difference signal is used as the electrical signal data preset at each test point on the carbon fiber composite grounding electrode.

[0030] Based on the above design, this invention adopts a layered differential excitation injection method to generate a layered differential excitation response field, which can reduce common-mode interference; synchronous acquisition and timing alignment of the potential difference signal can ensure that the signal corresponds to the excitation current in time; and targeted interference elimination methods can effectively remove power frequency interference and contact noise.

[0031] Preferably, the step of performing hierarchical feature mapping and cross-layer consistency verification on the electrical signal data of each test point to form a consistency verification passed dataset includes: Step 131: Split the electrical signal data of each test point to form a subset of electrical signals for the connection hole test points, a subset of electrical signals for the multi-tip metal mesh core test points, and a subset of electrical signals for the conductive curing layer test points. In specific implementation, the test point identification information can be extracted from the electrical signal data of each test point preset on the carbon fiber composite grounding electrode. Based on the test point identification information, the electrical signal data is divided into three subsets: a subset of electrical signals for the connection hole test points containing all electrical signals, a subset of electrical signals for the multi-tip metal mesh core test points containing all electrical signals, and a subset of electrical signals for the conductive curing layer test points containing all electrical signals.

[0032] Step 132: Perform layered resistance feature mapping on the electrical signal subsets of the connection hole test points, the multi-tipped metal mesh core test points, and the conductive curing layer test points, respectively, to form resistance feature mapping data for the connection hole test points, the multi-tipped metal mesh core test points, and the conductive curing layer test points. Specifically, for the connection hole test point electrical signal subset, according to Ohm's law, divide each potential difference signal by the corresponding excitation current amplitude to obtain the contact resistance value between the connection hole and the multi-tipped metal mesh core, thus generating the connection hole test point resistance feature mapping data. For the multi-tipped metal mesh core test point electrical signal subset, divide each potential difference signal by the corresponding excitation current amplitude to obtain the resistance value between different positions of the multi-tipped metal mesh core, thus generating the multi-tipped metal mesh core test point resistance feature mapping data. For a subset of electrical signals at the test points of the conductive curing layer, each potential difference signal is divided by the corresponding excitation current amplitude to obtain the resistance values ​​between different locations of the conductive curing layer, thus generating resistance feature mapping data for the test points of the conductive curing layer.

[0033] Step 133: Based on the resistance feature mapping data of the connection hole test points, the resistance feature mapping data of the multi-point metal mesh core test points, and the resistance feature mapping data of the conductive curing layer test points, perform cross-layer data consistency verification processing to form a consistency verification passed dataset. Specifically, based on the conductivity characteristics of the carbon fiber composite grounding electrode, a cross-layer resistance relationship model can be established. This model indicates that the total resistance of the multi-point metal mesh core should be less than the total resistance of the conductive curing layer, and the contact resistance between the connection hole and the multi-point metal mesh core should be much less than the body resistance of the multi-point metal mesh core. Substitute the resistance feature mapping data of the connection hole test points, the multi-point metal mesh core test points, and the conductive curing layer test points into the cross-layer resistance relationship model to determine if they meet the model requirements. If they do, retain the corresponding resistance feature mapping data; if they do not, it indicates that there is an error in the collected electrical signal data, and discard the corresponding resistance feature mapping data. Integrate all retained resistance feature mapping data to generate a consistency verification passed dataset.

[0034] Based on the above design, this invention splits electrical signal data into layers, enabling the processing of signal data from each layer separately; it performs resistance feature mapping on the signal data from each layer, converting electrical signals into resistance feature values; and it performs cross-layer data consistency verification, eliminating abnormal data that does not conform to conductivity logic.

[0035] Optionally, the step of performing multi-dimensional decoupling processing on the initial resistance measurement dataset to generate the electrode core body resistance component, the conductive solidification layer body resistance component, and the grounding electrode-soil contact resistance component includes: Step 21: Based on the initial resistance measurement dataset, construct a layered impedance matrix to form a three-layer structured layered impedance matrix; Step 22: Decouple the body impedance components of the three-layer structure layered impedance matrix to form the core body resistance component and the conductive curing layer body resistance component. Step 23: Combining the three-layer structure layered impedance matrix, the core body resistance component, and the conductive curing layer body resistance component, separate and decouple the grounding body-soil interface impedance to form the grounding body-soil contact resistance component; Step 24: Verify the consistency of the decoupling results of the core body resistance component, the conductive curing layer body resistance component, and the grounding body-soil contact resistance component to form a set of verified resistance components.

[0036] Based on the above design, this invention constructs a three-layer structured layered impedance matrix, enabling the report to comprehensively reflect the impedance coupling relationship between each test point; through the decoupling processing of the body impedance components, the core body resistance component and the conductive solidification layer body resistance component can be separated; through the grounding body-soil interface impedance separation and decoupling processing, the grounding body-soil contact resistance component can be obtained; and by performing consistency verification on the decoupling results, the accuracy of the decoupling results can be ensured.

[0037] Preferably, the step of constructing a layered impedance matrix based on the initial resistance measurement dataset to form a three-layer structured layered impedance matrix includes: Step 211: Obtain the hierarchical impedance mapping relationship corresponding to the connection hole test points, multi-point metal mesh core test points, and conductive curing layer test points. In specific implementation, the mapping relationship between test points and hierarchical impedance can be established based on the three-layer conductive structure of the carbon fiber composite grounding electrode. The connection hole test points and multi-point metal mesh core test points correspond to the core layer impedance, and the conductive curing layer test points correspond to the conductive curing layer impedance. Simultaneously, clarify the impedance coupling relationship between different test points: the impedance between the connection hole test point and the multi-point metal mesh core test point is the internal impedance of the core; the impedance between the multi-point metal mesh core test point and the conductive curing layer test point is the interlayer impedance; and the impedance between the connection hole test point and the conductive curing layer test point is the total impedance of the core layer and the conductive curing layer. Organize the above mapping and coupling relationships to generate the hierarchical impedance mapping relationship.

[0038] Step 212: Based on the hierarchical impedance mapping relationship, perform matrix dimension mapping on the initial resistance measurement dataset to form an initial hierarchical impedance matrix. Specifically, according to the hierarchical impedance mapping relationship, the dimension of the initial hierarchical impedance matrix can be determined to be 3×3, corresponding to three test points. Map the resistance characteristic values ​​in the initial resistance measurement dataset to the corresponding positions in the initial hierarchical impedance matrix according to the correspondence between the test points and excitation points. For example, fill the resistance value of the connection hole test point when current is injected at the connection hole test point into the first row and first column of the matrix; fill the resistance value of the multi-tip metal mesh core test point when current is injected at the connection hole test point into the second row and first column of the matrix, and so on. After filling, the initial hierarchical impedance matrix is ​​generated.

[0039] Step 213: Normalize the diagonal elements of the initial layered impedance matrix to form a three-layer structured impedance matrix. Specifically, all diagonal elements of the initial layered impedance matrix can be extracted, and their average value calculated. Each element of the initial layered impedance matrix is ​​then divided by the average value of its diagonal elements to normalize them. After normalization, the average value of the diagonal elements is 1, and the off-diagonal elements reflect the relative impedance coupling degree between different test points. The normalized matrix is ​​then used as the three-layer structured impedance matrix.

[0040] Based on the above design, this invention can obtain the hierarchical impedance mapping relationship corresponding to each test point, clarify the physical meaning of matrix elements, perform matrix dimension mapping on the initial resistance measurement dataset to generate an initial hierarchical impedance matrix, and perform diagonal element normalization on the initial hierarchical impedance matrix to improve the stability and comparability of the matrix.

[0041] Preferably, the step of decoupling the body impedance components of the three-layer structure's layered impedance matrix to form the core body resistance component and the conductive curing layer body resistance component includes: Step 221: Extract the core body impedance sub-matrix from the three-layer structure layered impedance matrix. Specifically, the core body consists of a connecting hole 1 and a multi-tipped metal mesh core 2. The corresponding test points are the connecting hole test points and the multi-tipped metal mesh core test points, corresponding to the first row and first column, and the second row and second column, of the three-layer structure layered impedance matrix, respectively. Elements from the first row, second row, first column, and second column can be extracted from the three-layer structure layered impedance matrix to form a 2×2 sub-matrix. This sub-matrix contains only impedance information related to the core body, thus generating the core body impedance sub-matrix.

[0042] Step 222: Extract the eigenvalues ​​of the impedance sub-matrix of the electrode core body to form the electrode core body resistance component. In specific implementation, the impedance sub-matrix of the electrode core body can be decomposed into two eigenvalues. Since the conductivity characteristics of the electrode core body are mainly determined by its main conduction path, the larger of the two eigenvalues ​​is taken as the electrode core body resistance component. This eigenvalue reflects the overall resistance of the electrode core body to current, including the body resistance of the multi-pointed metal mesh electrode core and the contact resistance between the connecting hole and the multi-pointed metal mesh electrode core.

[0043] Step 223: Extract the conductive curing layer body impedance sub-matrix from the three-layer structure layered impedance matrix; In specific implementation, the conductive curing layer 3 covers the outer surface of the multi-tipped metal mesh core 2, and its impedance characteristics are coupled with the impedance characteristics of the multi-tipped metal mesh core. The elements of the second row, third row, second column, and third column can be extracted from the three-layer structure layered impedance matrix to form a 2×2 sub-matrix. This sub-matrix contains the impedance information of the multi-tipped metal mesh core and the conductive curing layer, generating the conductive curing layer body impedance sub-matrix.

[0044] Step 224: Extract the eigenvalues ​​of the impedance sub-matrix of the conductive cured layer to form the resistivity component of the conductive cured layer. In practice, the impedance sub-matrix of the conductive cured layer can be decomposed into two eigenvalues. The larger of the two eigenvalues ​​is taken as the total resistance component of the multi-tip metal mesh core and the conductive cured layer. The core resistance component obtained earlier is subtracted from this total resistance component to obtain the resistivity component of the conductive cured layer. This component reflects the impedance of the conductive cured layer to current and is closely related to parameters such as the composition, thickness, and density of the conductive cured layer.

[0045] Based on the above design, this invention can process the impedance information of each layer separately by extracting the impedance sub-matrix of the core body and the impedance sub-matrix of the conductive curing layer body; by using the eigenvalue extraction method, the body resistance components of each layer can be obtained from the sub-matrix.

[0046] Preferably, the step of combining the three-layer structure layered impedance matrix, the core body resistance component, and the conductive solidified layer body resistance component to separate and decouple the grounding electrode-soil interface impedance, forming the grounding electrode-soil contact resistance component, includes: Step 231: Extract the total impedance characteristics of the three-layer structure impedance matrix to form the total impedance characteristic data of the carbon fiber composite grounding electrode. In practice, the three-layer structure impedance matrix can be decomposed into three eigenvalues. The largest eigenvalue reflects the overall resistance of the carbon fiber composite grounding electrode to current, including the core resistance, the conductive curing layer resistance, and the grounding electrode-soil contact resistance. This largest eigenvalue is used as the total impedance characteristic data of the carbon fiber composite grounding electrode.

[0047] Step 232: Based on the total impedance characteristic data of the carbon fiber composite grounding electrode, the resistance component of the electrode core, and the resistance component of the conductive curing layer, calculate the interface impedance difference to form the original data of the grounding electrode-soil interface impedance. In specific implementation, the total impedance of the carbon fiber composite grounding electrode consists of three parts connected in series: the resistance of the electrode core, the resistance of the conductive curing layer, and the contact resistance between the grounding electrode and the soil. Therefore, the difference between the total impedance characteristic data of the carbon fiber composite grounding electrode and the resistance component of the electrode core, and then the resistance component of the conductive curing layer, is the original data of the grounding electrode-soil interface impedance. This original data initially reflects the contact impedance between the grounding electrode and the soil, but does not consider the influence of interface conduction characteristics.

[0048] Step 233: Correct the interface conduction characteristics of the original grounding electrode-soil interface impedance data to form the grounding electrode-soil contact resistance component. In practice, the contact resistance between the grounding electrode and the soil is related not only to their resistivity but also to factors such as the effective surface area of ​​the grounding electrode and the current diffusion characteristics at the interface. Therefore, an interface conduction characteristic correction coefficient can be introduced to correct the original grounding electrode-soil interface impedance data. The interface conduction characteristic correction coefficient is calculated by obtaining parameters such as the surface resistivity of the conductive solidified layer, the soil resistivity, the effective surface area of ​​the carbon fiber composite grounding electrode, and the current diffusion coefficient. The corrected grounding electrode-soil contact resistance component is obtained by multiplying the original grounding electrode-soil interface impedance data by the interface conduction characteristic correction coefficient.

[0049] Based on the above design, this invention can obtain the original data of the grounding body-soil interface impedance by subtracting the resistance components of the electrode core and the conductive curing layer from the total impedance; by introducing an interface conduction characteristic correction coefficient, the original data of the interface impedance can be corrected to obtain the accurate grounding body-soil contact resistance component.

[0050] Further, the modification of the interface conduction characteristics of the original grounding electrode-soil interface impedance data to form the grounding electrode-soil contact resistance component includes: Step 2331: Obtain the surface resistivity of the conductive curing layer, soil resistivity, effective surface area of ​​the carbon fiber composite grounding electrode, and current diffusion coefficient. Specifically, the surface resistivity of the conductive curing layer 3 can be measured using the four-probe method. Multiple evenly distributed test points are selected on the surface of the conductive curing layer, and the average value of the measurement results is taken as the surface resistivity of the conductive curing layer. The resistivity of the soil surrounding the grounding electrode is measured using the four-electrode method, with the measurement depth consistent with the burial depth of the grounding electrode. The average value of multiple measurement points is taken as the soil resistivity. Based on the geometric dimensions of the carbon fiber composite grounding electrode, calculate its effective surface area in contact with the soil. For a cylindrical grounding electrode, the effective surface area is π multiplied by the diameter multiplied by the length. Determine the current diffusion coefficient based on the soil type and moisture content. For cohesive soil, the current diffusion coefficient can be taken as 0.8-0.9; for sandy soil, the current diffusion coefficient can be taken as 0.6-0.8.

[0051] Step 2332: Calculate the interface conduction characteristic correction coefficient based on the surface resistivity of the conductive cured layer, the soil resistivity, the effective surface area of ​​the carbon fiber composite grounding electrode, and the current diffusion coefficient. Specifically, the interface conduction characteristic correction coefficient reflects the resistivity matching degree between the conductive cured layer and the soil, as well as the current diffusion capability at the interface. When the surface resistivity of the conductive cured layer is closer to the soil resistivity, the current reflection at the interface is smaller, and the correction coefficient is closer to 1. When the effective surface area of ​​the carbon fiber composite grounding electrode is larger, the current diffusion is more sufficient, and the correction coefficient is larger. When the current diffusion coefficient is larger, the current diffusion capability in the soil is stronger, and the correction coefficient is larger. Considering the above factors comprehensively, the interface conduction characteristic correction coefficient can be calculated by substituting the surface resistivity of the conductive cured layer, the soil resistivity, the effective surface area of ​​the carbon fiber composite grounding electrode, and the current diffusion coefficient into a preset calculation model.

[0052] Step 2333: Correct the original grounding electrode-soil interface impedance data based on the interface conduction characteristic correction coefficient to form the grounding electrode-soil contact resistance component. In practice, the original grounding electrode-soil interface impedance data can be multiplied by the interface conduction characteristic correction coefficient to obtain the corrected grounding electrode-soil contact resistance component. The corrected contact resistance component can more accurately reflect the actual contact between the grounding electrode and the soil, and can eliminate the influence of interface conduction characteristics on the measurement results.

[0053] Based on the above design, this invention comprehensively considers multiple parameters such as the surface resistivity of the conductive curing layer, soil resistivity, effective surface area of ​​the carbon fiber composite grounding electrode, and current diffusion coefficient; by calculating the interface conduction characteristic correction coefficient, the original data of the grounding electrode-soil interface impedance can be corrected.

[0054] Furthermore, the interface conduction characteristic correction coefficient is calculated based on the following formula:

[0055] The grounding electrode-soil contact resistance component is calculated based on the following formula:

[0056] In the formula, This represents the interface conduction characteristic correction coefficient, a dimensionless parameter with a value range of 0.5-1.5. It is used to correct the original data of the grounding electrode-soil interface impedance to make it closer to the actual contact resistance. Represents the surface resistivity of the conductive cured layer, in Ω. m can be obtained by measuring the surface of the conductive curing layer using the four-probe method, reflecting the conductivity of the conductive curing layer surface; the conductive curing layer can be formed by composite curing of 1% to 10% recycled carbon fiber, 15% to 45% recycled aggregate, 3% to 5% silica fume, 10% to 20% geopolymer cementitious material, and 1% to 5% water-soluble conductive liquid. Its surface resistivity is closely related to the content of recycled carbon fiber and water-soluble conductive liquid. The higher the content, the lower the surface resistivity. Represents soil resistivity, with units of Ω. m can be obtained by measuring the soil around the grounding electrode using the four-electrode method. It reflects the soil's conductivity and is related to factors such as soil type, humidity, and temperature. This represents the preset resistivity coupling index, a dimensionless parameter with values ​​ranging from 0.3 to 0.5. It is used to characterize the degree of coupling between the surface resistivity of the conductive solidified layer and the soil resistivity, and can be obtained by fitting experimental data. This represents the preset current diffusion coefficient, a dimensionless parameter that can take values ​​from 0.6 to 0.9. It is used to characterize the diffusion ability of current in soil and can be determined according to soil type. This represents the effective surface area of ​​the carbon fiber composite grounding electrode, in m². 2 It can be calculated based on the geometric dimensions of the grounding electrode, reflecting the contact area between the grounding electrode and the soil; This represents the effective surface area of ​​the grounding electrode reference, in meters. 2 , can be set 1m 2 ,pass / It can eliminate the dimensions of the exponential term; The original data of the grounding electrode-soil interface impedance is expressed in Ω, which can be obtained by subtracting the resistance component of the electrode core and the resistance component of the conductive solidification layer from the total impedance. This represents the corrected grounding electrode-soil contact resistance component, expressed in Ω, which is the corrected contact resistance value between the grounding electrode and the soil.

[0057] Based on the above design, this invention establishes a formula for calculating the interface conduction characteristic correction coefficient, which includes the surface resistivity of the conductive curing layer, soil resistivity, preset resistivity coupling index, preset current diffusion coefficient, and effective surface area of ​​the carbon fiber composite grounding body. Based on the interface conduction characteristic correction coefficient, the original data of the grounding body-soil interface impedance are corrected to obtain the final grounding body-soil contact resistance component.

[0058] Optionally, the step of constructing a grounding resistance correlation model for the carbon fiber composite grounding electrode based on the resistance components of the electrode core, the conductive curing layer, and the grounding electrode-soil contact resistance components includes: Step 31: Construct a layered parameter-resistance component correspondence for the resistive components of the electrode core, the resistive components of the conductive curing layer, and the resistive components of the grounding electrode-soil contact, forming a set of layered parameter-resistance component mapping relationships; Step 32: Based on the mapping relationship set, build a single-component resistor model to form a core body resistor model, a conductive solidified layer body resistor model, and a grounding body-soil contact resistor model. Step 33: Perform multi-sub-model coupling and integration on the electrode core body resistance sub-model, the conductive solidified layer body resistance sub-model, and the grounding body-soil contact resistance sub-model to form an initial grounding resistance correlation model; Step 34: Verify the generalization ability of the initial grounding resistance correlation model to form a carbon fiber composite grounding electrode grounding resistance correlation model. In practice, measured data of carbon fiber composite grounding electrodes from different regions and under different soil conditions that were not involved in model training can be collected and input into the initial grounding resistance correlation model to obtain the predicted total grounding resistance. The predicted total grounding resistance is compared with the actual measured total grounding resistance to calculate the model's generalization error. If the generalization error is less than a preset threshold (e.g., 10%), it indicates that the model has good generalization ability, and the initial grounding resistance correlation model is used as the final carbon fiber composite grounding electrode grounding resistance correlation model. If the generalization error is greater than or equal to the preset threshold, more training data is added, and the model is retrained and coupled together again.

[0059] Based on the above design, this invention adopts a hierarchical modeling approach, which can construct the mapping relationship between the parameters of each layer and the corresponding resistance components. First, a single-component resistance sub-model is trained, and then the overall model is obtained through coupling and integration. Finally, the model generalization verification can be performed.

[0060] Preferably, the step of constructing a layered parameter-resistance component correspondence for the resistive components of the electrode core, the conductive curing layer, and the grounding electrode-soil contact resistive components, forming a layered parameter-resistance component mapping relationship set, includes: Step 311: Obtain the design parameter set for the electrode core, the conductive curing layer, and the grounding electrode-soil interface. Specifically, the electrode core design parameter set includes parameters such as the material (e.g., galvanized steel, stainless steel), diameter (e.g., 6mm-12mm), mesh size (e.g., 50mm×50mm-100mm×100mm), and connection hole diameter (e.g., 16mm-24mm) of the multi-point metal mesh electrode core. The conductive curing layer design parameter set includes parameters such as the mass fraction of recycled carbon fiber (1%–10%), the mass fraction of recycled aggregate (15%–45%), the mass fraction of silica fume (3%–5%), the mass fraction of geopolymer cementitious material (10%–20%), the mass fraction of water-soluble conductive liquid (1%–5%), and the curing layer thickness (e.g., 20mm-50mm). The grounding electrode-soil interface design parameter set includes parameters such as the effective surface area and surface roughness (e.g., Ra6.3-Ra25) of the carbon fiber composite grounding electrode. All of the above parameters can be obtained by consulting product design documents and actual measurements, and a corresponding parameter set can be generated.

[0061] Step 312: Based on the set of design parameters for the core body and the resistance components of the core body, construct a core parameter-resistance mapping relationship. Specifically, each parameter in the core body design parameter set can be used as an independent variable, and the corresponding core body resistance component as a dependent variable. A correlation analysis method is used to calculate the correlation coefficient between each independent variable and the dependent variable, and parameters with high correlation to the core body resistance components are selected, such as the diameter of the multi-tip metal mesh core and the aperture of the connecting holes. Based on the selected parameters, a functional relationship is established between the core body resistance components and these parameters, generating the core parameter-resistance mapping relationship.

[0062] Step 313: Based on the set of design parameters for the conductive curing layer and the resistivity components of the conductive curing layer, construct a parameter-resistance mapping relationship for the conductive curing layer. Specifically, each parameter in the set of design parameters can be used as an independent variable, and the corresponding resistivity component of the conductive curing layer can be used as the dependent variable. Correlation analysis is used to calculate the correlation coefficient between each independent variable and the dependent variable, and parameters with high correlation to the resistivity components of the conductive curing layer are selected, such as the content of recycled carbon fiber, the content of water-soluble conductive liquid, and the thickness of the cured layer. Based on the selected parameters, a functional relationship is established between the resistivity components of the conductive curing layer and these parameters, generating the parameter-resistance mapping relationship for the conductive curing layer.

[0063] Step 314: Based on the set of design parameters for the grounding electrode-soil interface and the components of the grounding electrode-soil contact resistance, construct a parameter-resistance mapping relationship for the grounding electrode-soil interface. In specific implementation, each parameter in the set of design parameters for the grounding electrode-soil interface can be used as an independent variable, and the corresponding component of the grounding electrode-soil contact resistance can be used as a dependent variable. Correlation analysis is used to calculate the correlation coefficient between each independent variable and the dependent variable, and parameters with high correlation to the components of the grounding electrode-soil contact resistance, such as the effective surface area and surface roughness of the carbon fiber composite grounding electrode, are selected. Based on the selected parameters, a functional relationship is established between the components of the grounding electrode-soil contact resistance and these parameters, generating the parameter-resistance mapping relationship for the grounding electrode-soil interface.

[0064] Step 315: Based on the core parameter-resistance mapping relationship, the conductive curing layer parameter-resistance mapping relationship, and the grounding electrode-soil interface parameter-resistance mapping relationship, construct a set of layered parameter-resistance component mapping relationships. In specific implementation, the core parameter-resistance mapping relationship, the conductive curing layer parameter-resistance mapping relationship, and the grounding electrode-soil interface parameter-resistance mapping relationship can be integrated, categorized and organized according to hierarchy, to construct a set of layered parameter-resistance component mapping relationships. This set contains the quantitative relationship between the design parameters of each layer of the carbon fiber composite grounding electrode and the corresponding resistance components, providing a data foundation for the subsequent construction of single-component resistance sub-models.

[0065] Based on the above design, this invention divides the design parameters into three independent sets: the core body, the conductive solidified layer body, and the grounding body-soil interface. This allows for the construction of parameter-resistance mapping relationships at three different levels, forming a set of layered parameter-resistance component mapping relationships. This clarifies the influence of each layer's design parameters on the corresponding resistance components, providing a clear direction for parameter optimization and facilitating the individual adjustment of design parameters at a specific level to achieve precise control of grounding performance.

[0066] Preferably, the step of building a single-component resistivity model based on the mapping relationship set to form a core resistivity model, a conductive solidification layer resistivity model, and a grounding electrode-soil contact resistivity model includes: Step 321: Based on the core parameter-resistance mapping relationship in the hierarchical parameter-resistance component mapping relationship set, train the core body resistivity sub-model to form the core body resistivity sub-model. Specifically, core parameter-resistance mapping relationship data can be extracted from the hierarchical parameter-resistance component mapping relationship set and divided into training and validation sets. A multiple linear regression algorithm is used, with the core body design parameters in the training set as input and the corresponding core body resistivity components as output, to train the model. During training, the coefficients of the model are optimized using the least squares method to minimize the sum of squared errors between the model's predicted and measured values. The trained model is validated using validation set data, and the model's hyperparameters, such as the regularization coefficient, are adjusted to prevent overfitting. Finally, a core body resistivity sub-model capable of predicting the core body resistivity components based on the core body design parameters is obtained.

[0067] Step 322: Based on the conductive curing layer parameter-resistance mapping relationship in the set of layered parameter-resistance component mapping relationships, train the conductive curing layer body resistance sub-model to form a conductive curing layer body resistance sub-model. Specifically, the conductive curing layer parameter-resistance mapping relationship data can be extracted from the set of layered parameter-resistance component mapping relationships and divided into a training set and a validation set. A multiple linear regression algorithm is used, with the conductive curing layer body design parameters in the training set as input and the corresponding conductive curing layer body resistance components as output, to train the model. During training, the coefficients of the model are optimized using the least squares method to minimize the sum of squared errors between the model's predicted and measured values. The trained model is validated using validation set data, and the model's hyperparameters, such as the regularization coefficient, are adjusted to prevent overfitting. Finally, a conductive curing layer body resistance sub-model that can predict the conductive curing layer body resistance components based on the conductive curing layer body design parameters is obtained.

[0068] Step 323: Based on the grounding electrode-soil interface parameter-resistance mapping relationship in the hierarchical parameter-resistance component mapping relationship set, train the grounding electrode-soil contact resistance sub-model to form a grounding electrode-soil contact resistance sub-model. Specifically, grounding electrode-soil interface parameter-resistance mapping relationship data can be extracted from the hierarchical parameter-resistance component mapping relationship set and divided into training and validation sets. A multiple linear regression algorithm is used, with the grounding electrode-soil interface design parameters in the training set as input and the corresponding grounding electrode-soil contact resistance components as output, to train the model. During training, the coefficients of the model are optimized using the least squares method to minimize the sum of squared errors between the model's predicted and measured values. The trained model is validated using validation set data, and the model's hyperparameters, such as the regularization coefficient, are adjusted to prevent overfitting. Finally, a grounding electrode-soil contact resistance sub-model capable of predicting the grounding electrode-soil contact resistance components based on the grounding electrode-soil interface design parameters is obtained.

[0069] Based on the above design, this invention trains the core body resistance sub-model, the conductive solidified layer body resistance sub-model, and the grounding body-soil contact resistance sub-model respectively based on the hierarchical parameter-resistance component mapping relationship set. Each sub-model corresponds to the resistance prediction of only one level, and the input parameters are only the design parameters of that level. Thus, each sub-model has fewer input parameters, faster training speed, and higher prediction accuracy. The sub-models can be adjusted and optimized independently. When the design parameters of a certain level change, it is only necessary to retrain the corresponding sub-model.

[0070] Preferably, the step of coupling and integrating the multi-sub-models of the electrode core body resistance sub-model, the conductive solidified layer body resistance model, and the grounding electrode-soil contact resistance sub-model to form an initial grounding resistance correlation model includes: Step 331: Obtain the interlayer conduction coupling coefficient between the electrode core resistive sub-model and the conductive curing layer resistive sub-model. In practice, multiple sets of carbon fiber composite grounding electrode samples with different design parameters for the electrode core and multiple sets of carbon fiber composite grounding electrode samples with different design parameters for the conductive curing layer can be prepared. The resistive components of the electrode core, the conductive curing layer, and the total resistance of each sample are measured. According to the calculation principle of series resistance, if there is no interlayer conduction coupling, the total resistance should be equal to the sum of the resistive components of the electrode core and the conductive curing layer. However, due to the contact resistance and current diffusion effect between the electrode core and the conductive curing layer, the actual total resistance differs from the theoretically calculated value. Through fitting a large amount of experimental data, the interlayer conduction coupling coefficient between the electrode core resistive sub-model and the conductive curing layer resistive sub-model can be obtained. This coefficient reflects the degree of influence of interlayer conduction coupling on the total resistance.

[0071] Step 332: Obtain the interfacial conduction coupling coefficient between the conductive curing layer body resistance sub-model and the grounding electrode-soil contact resistance sub-model. In practice, multiple sets of carbon fiber composite grounding electrode samples with different design parameters for the conductive curing layer body and multiple sets of carbon fiber composite grounding electrode samples with different design parameters for the grounding electrode-soil interface can be prepared. The conductive curing layer body resistance component, the grounding electrode-soil contact resistance component, and the total resistance of each sample are measured. According to the calculation principle of series resistance, if there is no interfacial conduction coupling, the total resistance should be equal to the sum of the conductive curing layer body resistance component and the grounding electrode-soil contact resistance component. However, due to the interfacial capacitance and current refraction effect between the conductive curing layer and the soil, the actual total resistance differs from the theoretically calculated value. Through fitting a large amount of experimental data, the interfacial conduction coupling coefficient between the conductive curing layer body resistance sub-model and the grounding electrode-soil contact resistance sub-model can be obtained. This coefficient reflects the degree of influence of interfacial conduction coupling on the total resistance.

[0072] Step 333: Based on the interlayer conduction coupling coefficient and the interface conduction coupling coefficient, the core body resistance sub-model, the conductive solidified layer body resistance sub-model, and the grounding electrode-soil contact resistance sub-model are weighted and coupled to form an initial grounding resistance correlation model. Specifically, the output value of the core body resistance sub-model can be multiplied by the interlayer conduction coupling coefficient to obtain the coupling correction value of the core body resistance; the output value of the conductive solidified layer body resistance sub-model can be multiplied by the interface conduction coupling coefficient to obtain the coupling correction value of the conductive solidified layer body resistance; the output value of the grounding electrode-soil contact resistance sub-model remains unchanged. The three corrected resistance values ​​are then added together to obtain the total grounding resistance output of the initial grounding resistance correlation model. This weighted coupling process considers the influence of interlayer and interface conduction coupling effects on the total grounding resistance, improving the model's prediction accuracy.

[0073] Based on the above design, this invention introduces the interlayer conduction coupling coefficient between the core body and the conductive solidification layer, and the interface conduction coupling coefficient between the conductive solidification layer and the soil. Based on the coupling coefficient, the outputs of the three single-component resistance sub-models are weighted and coupled to generate an initial grounding resistance correlation model. This takes into account the influence of interlayer and interface conduction coupling on the total grounding resistance, which makes the model prediction results more consistent with the actual conduction process. The coupling coefficient can be calibrated experimentally, which can improve the model's adaptability to different process conditions.

[0074] Further, the weighted coupling of the electrode core resistivity model, the conductive solidified layer resistivity model, and the grounding electrode-soil contact resistivity model based on the interlayer conduction coupling coefficient and the interface conduction coupling coefficient to form an initial grounding resistance correlation model includes: Step 3331: Obtain the interlayer contact resistance between the electrode core and the conductive curing layer, the interface capacitance between the conductive curing layer and the soil, and the preset test current frequency. Specifically, the four-terminal method can be used to measure the interlayer contact resistance between the electrode core and the conductive curing layer. During measurement, connect the two current terminals to the multi-point metal mesh electrode core and the conductive curing layer respectively, and connect the two voltage terminals to the positions of the electrode core and the conductive curing layer near the contact interface respectively. The measured resistance value is the interlayer contact resistance. Use an impedance analyzer to measure the interface capacitance between the conductive curing layer and the soil. The measurement frequency should be consistent with the preset test current frequency. The preset test current frequency is determined based on the power frequency interference in the measurement environment, typically selected between 1kHz and 10kHz to avoid 50Hz power frequency interference.

[0075] Step 3332: Based on the interlayer conductive coupling coefficient, the interface conductive coupling coefficient, the interlayer contact resistance, the interface capacitance, and the preset test current frequency, weighted coupling is performed to generate a preset cross-coupling correction coefficient. In specific implementation, the interlayer contact resistance causes additional obstruction to current conduction between the electrode core and the conductive solidified layer, and the interface capacitance causes capacitive reactance of the AC current at the interface. The combined effect of these two factors produces a cross-coupling effect, affecting the measurement result of the total grounding resistance. By establishing a mathematical model of the cross-coupling effect, the interlayer conductive coupling coefficient, the interface conductive coupling coefficient, the interlayer contact resistance, the interface capacitance, and the preset test current frequency can be substituted into the model to calculate the preset cross-coupling correction coefficient. This coefficient is used to correct the mutual influence between interlayer and interface conductive coupling, which can further improve the prediction accuracy of the model.

[0076] Step 3333: Based on the interlayer conduction coupling coefficient, the interface conduction coupling coefficient, and the preset cross-coupling correction coefficient, the core resistivity sub-model, the conductive solidified layer resistivity sub-model, and the grounding electrode-soil contact resistivity sub-model are weighted and coupled to form an initial grounding resistance correlation model. Specifically, the output value of the core resistivity sub-model can be superimposed with the interlayer contact resistance and then multiplied by the interlayer conduction coupling coefficient to obtain the total corrected resistance of the core layer; the conductive solidified layer resistivity can be superimposed with the interface capacitance and reactance and then multiplied by the interface conduction coupling coefficient to obtain the total corrected resistance of the solidified layer interface; the grounding electrode-soil contact resistance can be directly superimposed; then a cross-coupling correction term is introduced for difference correction; all the above parts are combined and summed to obtain the total grounding resistance of the initial grounding resistance correlation model. By introducing the cross-coupling correction term, the influence of various coupling effects on the total grounding resistance can be considered more comprehensively, making the model's prediction results closer to the actual values.

[0077] Based on the above design, this invention introduces the interlayer contact resistance between the core and the conductive solidification layer, the interface capacitance between the conductive solidification layer and the soil, and a preset test current frequency. By calculating a preset cross-coupling correction coefficient, the weighted coupling result is corrected twice. This can eliminate the influence of interface capacitance and cross-coupling effect on the total resistance calculation under AC test conditions, making the model applicable to a wide frequency range of 1kHz-10kHz. It can improve the prediction accuracy of the model at different test frequencies and expand the applicable scenarios of the model.

[0078] Furthermore, the total grounding resistance output of the initial grounding resistance correlation model is calculated based on the following formula:

[0079] In the formula, This represents the total grounding resistance of the carbon fiber composite grounding electrode, expressed in Ω. It is the output value of the initial grounding resistance correlation model and reflects the overall grounding performance of the carbon fiber composite grounding electrode. The interlayer conduction coupling coefficient represents the resistance sub-model of the electrode core and the resistance sub-model of the conductive solidified layer. It is a dimensionless parameter that can take values ​​of 0.9-1.1. It is obtained by fitting experimental data and can reflect the degree of conduction coupling between the electrode core and the conductive solidified layer. This represents the output value of the core resistive sub-model, in units of Ω, which is predicted by the core resistive sub-model based on the core design parameters. It represents the interlayer contact resistance between the electrode core and the conductive curing layer, with the unit being Ω. It can be measured by the four-terminal method and reflects the contact condition between the electrode core and the conductive curing layer. The conductive coupling coefficient represents the interfacial conduction coupling between the conductive solidified layer body resistance model and the grounding body-soil contact resistance model. It is a dimensionless parameter with a value of 0.8-1.2, obtained by fitting experimental data, and reflects the degree of conduction coupling between the conductive solidified layer and the soil. This represents the output value of the conductive curing layer body resistance sub-model, in Ω, which can be predicted by the conductive curing layer body resistance sub-model based on the conductive curing layer body design parameters. This indicates the preset test current frequency, in Hz, which can be determined according to the measurement environment, and is usually 1kHz-10kHz. This represents the interfacial capacitance between the conductive solidification layer and the soil, measured in F. It can be measured using an impedance analyzer and reflects the capacitive characteristics between the conductive solidification layer and the soil. The output value of the grounding electrode-soil contact resistance sub-model is expressed in Ω and can be predicted by the grounding electrode-soil contact resistance model based on the grounding electrode-soil interface design parameters. This represents the preset cross-coupling correction coefficient, a dimensionless parameter with a possible value range of 0.95-1.05. It is calculated through a mathematical model and can be used to correct the influence of cross-coupling effects.

[0080] Based on the above design, the total grounding resistance calculation formula of this invention includes the interlayer conduction coupling coefficient, the interface conduction coupling coefficient, and the preset cross-coupling correction coefficient. It also considers the influence of interlayer contact resistance and the interface capacitance between the conductive solidification layer and the soil on the total resistance, which facilitates the analysis of the degree of influence of different factors on the total grounding resistance.

[0081] Optionally, the step of verifying the design parameters of the carbon fiber composite grounding electrode based on the grounding resistance correlation model to obtain grounding resistance verification data includes: Step 41: Based on the grounding resistance correlation model of the carbon fiber composite grounding body, perform theoretical resistance component prediction on the design parameters of the carbon fiber composite grounding body to generate theoretical core body resistance component, theoretical conductive curing layer body resistance component, and theoretical grounding body-soil contact resistance component. Step 42: Perform layered parameter deviation calculations on the theoretical electrode core body resistance component, the theoretical conductive solidified layer body resistance component, and the theoretical grounding electrode-soil contact resistance component to generate electrode core parameter deviation data, conductive solidified layer parameter deviation data, and grounding electrode-soil interface parameter deviation data. Step 43: Based on the electrode core parameter deviation data, the conductive curing layer parameter deviation data, and the grounding body-soil interface parameter deviation data, perform a multi-dimensional parameter deviation comprehensive verification to generate parameter deviation comprehensive verification data; Step 44: Perform verification result classification processing on the comprehensive parameter deviation verification data to generate grounding resistance verification data. In practice, the grounding resistance verification data can be classified according to the deviation level in the comprehensive parameter deviation verification data. If the comprehensive parameter deviation level is excellent, it indicates that the design parameters are reasonable and the product performance meets the requirements; if the comprehensive parameter deviation level is qualified, it indicates that the design parameters are basically reasonable, but some parameters need adjustment; if the comprehensive parameter deviation level is unqualified, it indicates that there are significant problems with the design parameters and the product performance does not meet the requirements. The classification results are then integrated with the parameter deviation data from each layer to generate complete grounding resistance verification data.

[0082] Based on the above design, this invention predicts the theoretical resistance components of each layer based on the grounding resistance correlation model and compares them with the measured components. This allows for a quantitative assessment of the rationality of the design parameters, timely identification of problems in the design, and avoidance of the limitations of single-indicator judgment through multi-dimensional comprehensive verification, making product quality assessment more comprehensive and objective.

[0083] Preferably, the step of performing theoretical resistance component prediction on the design parameters of the carbon fiber composite grounding electrode based on the grounding resistance correlation model of the carbon fiber composite grounding electrode to generate theoretical electrode core body resistance component, theoretical conductive solidified layer body resistance component, and theoretical grounding electrode-soil contact resistance component includes: Step 411: Obtain the design parameter set of the carbon fiber composite grounding electrode to be verified. Specifically, this involves extracting the core design parameters from the design document of the carbon fiber composite grounding electrode, including the material, diameter, mesh size, and connection hole diameter of the multi-pointed metal mesh core; extracting the conductive curing layer design parameters, including the mass fraction of recycled carbon fiber, recycled aggregate, silica fume, geopolymer cementitious material, water-soluble conductive liquid, and curing layer thickness; and extracting the grounding electrode-soil interface design parameters, including the length, diameter, and effective surface area of ​​the carbon fiber composite grounding electrode. All these parameters are then compiled to generate the design parameter set of the carbon fiber composite grounding electrode to be verified.

[0084] Step 412: Based on the core resistance sub-model in the grounding resistance correlation model of the carbon fiber composite grounding electrode, predict the theoretical core resistance of the design parameter set to generate theoretical core resistance components. Specifically, core design parameters can be extracted from the design parameter set and input into the core resistance sub-model. The core resistance sub-model calculates the theoretical core resistance components based on a pre-trained parameter-resistance mapping relationship. This component reflects the expected resistance value of the core under the current core design parameters.

[0085] Step 413: Based on the conductive curing layer body resistance sub-model in the grounding resistance correlation model of the carbon fiber composite grounding electrode, predict the theoretical resistance of the curing layer from the set of design parameters to generate the theoretical conductive curing layer body resistance component. Specifically, the conductive curing layer body design parameters can be extracted from the set of design parameters and input into the conductive curing layer body resistance sub-model. The conductive curing layer body resistance sub-model calculates the theoretical conductive curing layer body resistance component based on the pre-trained parameter-resistance mapping relationship. This component reflects the expected resistance value of the conductive curing layer portion under the current conductive curing layer body design parameters.

[0086] Step 414: Based on the grounding electrode-soil contact resistance sub-model in the grounding resistance correlation model of the carbon fiber composite grounding electrode, predict the theoretical interface resistance of the design parameter set to generate the theoretical grounding electrode-soil contact resistance component. In specific implementation, grounding electrode-soil interface design parameters can be extracted from the design parameter set and input into the grounding electrode-soil contact resistance sub-model. The grounding electrode-soil contact resistance sub-model calculates the theoretical grounding electrode-soil contact resistance component based on the pre-trained parameter-resistance mapping relationship. This component reflects the expected contact resistance value between the grounding electrode and the soil under the current grounding electrode-soil interface design parameters.

[0087] Based on the above design, this invention can use three independent sub-models in the grounding resistance correlation model to predict the theoretical core body resistance component, the theoretical conductive solidified layer body resistance component, and the theoretical grounding body-soil contact resistance component, respectively. Each sub-model only requires input of the design parameters of the corresponding layer, thereby providing an accurate theoretical benchmark for calculating the parameter deviation of each layer, ensuring the accuracy of parameter verification, predicting the resistance performance of each layer before product production, optimizing design parameters in advance, and reducing production costs.

[0088] Preferably, the step of performing layered parameter deviation calculations on the theoretical electrode core resistance component, the theoretical conductive solidified layer resistance component, and the theoretical grounding electrode-soil contact resistance component to generate electrode core parameter deviation data, conductive solidified layer parameter deviation data, and grounding electrode-soil interface parameter deviation data includes: Step 421: Obtain the measured components of the electrode core resistance, the measured components of the conductive curing layer resistance, and the measured components of the grounding electrode-soil contact resistance. In practice, the grounding resistance of the carbon fiber composite grounding electrode to be calibrated can be measured. Through multi-dimensional decoupling processing, the measured components of the electrode core resistance, the measured components of the conductive curing layer resistance, and the measured components of the grounding electrode-soil contact resistance are obtained. Ensure that the measurement process strictly follows the configuration information collected at the test points to guarantee the reliability of the measured data.

[0089] Step 422: Based on the theoretical and measured resistance components of the core body, calculate the core parameter deviation to generate core parameter deviation data. Specifically, the absolute deviation between the theoretical and measured core resistance components can be calculated; the absolute deviation equals the theoretical value minus the measured value. The relative deviation of the core parameters is also calculated; the relative deviation equals the absolute deviation divided by the measured core resistance component multiplied by 100%. This relative deviation is used as the core parameter deviation data, reflecting the degree of deviation between the actual resistance of the core body and the theoretical design value.

[0090] Step 423: Based on the theoretical and measured resistivity components of the conductive cured layer, calculate the parameter deviation of the cured layer to generate conductive cured layer parameter deviation data. Specifically, the absolute deviation between the theoretical and measured resistivity components of the conductive cured layer can be calculated; the absolute deviation equals the theoretical value minus the measured value. The relative deviation of the conductive cured layer parameters is also calculated; the relative deviation equals the absolute deviation divided by the measured resistivity component of the conductive cured layer multiplied by 100%. This relative deviation is used as the conductive cured layer parameter deviation data, reflecting the degree of deviation between the actual resistance of the conductive cured layer and the theoretical design value.

[0091] Step 424: Based on the theoretical grounding electrode-soil contact resistance component and the measured grounding electrode-soil contact resistance component, calculate the interface parameter deviation to generate grounding electrode-soil interface parameter deviation data. Specifically, the absolute deviation between the theoretical and measured grounding electrode-soil contact resistance components can be calculated; the absolute deviation equals the theoretical value minus the measured value. The relative deviation of the grounding electrode-soil interface parameters is calculated; the relative deviation equals the absolute deviation divided by the measured grounding electrode-soil contact resistance component multiplied by 100%. This relative deviation of the grounding electrode-soil interface parameters is used as the grounding electrode-soil interface parameter deviation data, which reflects the degree of deviation between the actual grounding electrode-soil contact resistance and the theoretical design value.

[0092] Based on the above design, this invention calculates the parameter deviation data of three levels: the electrode core body, the conductive solidified layer body, and the grounding body-soil interface. The deviation data of each level is the relative deviation between the theoretical resistance component and the measured resistance component of that level. This can accurately locate the specific level that causes the total resistance to be unqualified, providing a clear direction for subsequent design optimization and process improvement. It also facilitates the analysis of the contribution of parameter deviations at each level to the total resistance, and prioritizes solving problems with a greater impact.

[0093] Preferably, the step of performing a multi-dimensional parameter deviation comprehensive verification based on the electrode core parameter deviation data, the conductive curing layer parameter deviation data, and the grounding electrode-soil interface parameter deviation data to generate comprehensive parameter deviation verification data includes: Step 431: Obtain the weighting coefficients for the electrode core parameter deviation, the conductive curing layer parameter deviation, and the grounding electrode-soil interface parameter deviation. In practice, the influence of each layer's resistance component on the total grounding resistance can be determined based on extensive engineering data and simulation analysis results. Generally, the grounding electrode-soil contact resistance has the greatest impact on the total grounding resistance, followed by the conductive curing layer's resistance, and then the electrode core's resistance. Therefore, the weighting coefficients for the grounding electrode-soil interface parameter deviation can be set to 0.4-0.6, the conductive curing layer parameter deviation to 0.3-0.4, and the electrode core parameter deviation to 0.1-0.2. The sum of the three weighting coefficients is 1 to ensure the rationality of the comprehensive verification results.

[0094] Step 432: Based on the core parameter deviation weighting coefficient, the conductive curing layer parameter deviation weighting coefficient, and the grounding electrode-soil interface parameter deviation weighting coefficient, a weighted sum of the core parameter deviation data, conductive curing layer parameter deviation data, and grounding electrode-soil interface parameter deviation data is generated to produce a comprehensive parameter deviation value. Specifically, the core parameter deviation data can be multiplied by the core parameter deviation weighting coefficient to obtain a weighted core parameter deviation value; the conductive curing layer parameter deviation data can be multiplied by the conductive curing layer parameter deviation weighting coefficient to obtain a weighted conductive curing layer parameter deviation value; and the grounding electrode-soil interface parameter deviation data can be multiplied by the grounding electrode-soil interface parameter deviation weighting coefficient to obtain a weighted grounding electrode-soil interface parameter deviation value. These three weighted values ​​are then added together to obtain the comprehensive parameter deviation value. This comprehensive value can fully reflect the overall deviation of the carbon fiber composite grounding electrode design parameters.

[0095] Step 433: Based on the comprehensive parameter deviation value and the preset parameter deviation threshold, perform a comprehensive parameter deviation judgment to generate comprehensive parameter deviation verification data. Specifically, three parameter deviation thresholds can be preset: an excellent threshold (e.g., 5%), a qualified threshold (e.g., 10%), and a non-qualified threshold (e.g., 15%). Compare the comprehensive parameter deviation value with the above thresholds: if the comprehensive parameter deviation value is less than or equal to the excellent threshold, the comprehensive parameter deviation level is determined to be excellent; if the comprehensive parameter deviation value is greater than the excellent threshold but less than or equal to the qualified threshold, the comprehensive parameter deviation level is determined to be qualified; if the comprehensive parameter deviation value is greater than the qualified threshold but less than or equal to the non-qualified threshold, the comprehensive parameter deviation level is determined to be basically qualified; if the comprehensive parameter deviation value is greater than the non-qualified threshold, the comprehensive parameter deviation level is determined to be unqualified. Integrate the judgment result with the comprehensive parameter deviation value to generate comprehensive parameter deviation verification data.

[0096] Based on the above design, this invention sets different parameter deviation weighting coefficients according to the degree of influence of each layer's resistance component on the total grounding resistance, performs weighted summation of the parameter deviation data of each layer, obtains a comprehensive parameter deviation value, and makes a grade judgment based on a preset threshold. This comprehensive evaluation result is more in line with actual engineering needs and avoids misjudging products as unqualified due to excessive deviation of minor parameters. The weighting coefficients can be adjusted according to the requirements of different application scenarios, thereby improving the flexibility of the evaluation method.

[0097] Optionally, the step of generating batch performance consistency evaluation results and design optimization guidance information for carbon fiber composite grounding electrodes based on the grounding resistance verification data includes: Step 51: Decompose the grounding resistance verification data into layered parameter deviations to generate a set of electrode core parameter deviations, a set of conductive solidification layer parameter deviations, and a set of grounding body-soil interface parameter deviations. Step 52: Based on the set of electrode core parameter deviations, the set of conductive curing layer parameter deviations, and the set of grounding electrode-soil interface parameter deviations, perform a layered batch consistency assessment to generate electrode core batch consistency data, conductive curing layer batch consistency data, and grounding electrode-soil interface batch consistency data. Step 53: Based on the batch consistency data of the electrode core, the batch consistency data of the conductive curing layer, and the batch consistency data of the grounding electrode-soil interface, perform layered directional design optimization to generate electrode core design optimization data, conductive curing layer design optimization data, and grounding electrode-soil interface design optimization data. Step 54: Based on the batch consistency data of the electrode core, the conductive curing layer, the grounding electrode-soil interface, the electrode core design optimization data, the conductive curing layer design optimization data, and the grounding electrode-soil interface design optimization data, generate batch performance consistency evaluation results and design optimization guidance information for the carbon fiber composite grounding electrode. In specific implementation, the batch consistency data of the electrode core, the conductive curing layer, and the grounding electrode-soil interface can be comprehensively analyzed to evaluate the overall performance consistency of the entire batch of carbon fiber composite grounding electrodes, generating batch performance consistency evaluation results. The electrode core design optimization data, the conductive curing layer design optimization data, and the grounding electrode-soil interface design optimization data are then organized, and specific improvement measures and suggestions are provided for the problems existing in each layer, generating design optimization guidance information.

[0098] Based on the above design, this invention decomposes the grounding resistance verification data into layers, calculates the dispersion of parameter deviations in each layer, evaluates the batch consistency of each layer, and matches the corresponding design optimization direction according to the batch consistency data of each layer, generating targeted design optimization guidance information. This can promptly identify stability problems in the production process, improve the batch consistency of products, and the targeted design optimization guidance information can be directly used to improve product design and production processes, accelerating product iteration.

[0099] Preferably, the step of performing layered parameter deviation decomposition on the grounding resistance verification data to generate a core parameter deviation set, a conductive solidification layer parameter deviation set, and a grounding body-soil interface parameter deviation set includes: Step 511: Obtain the grounding resistance verification data set for all carbon fiber composite grounding electrodes within the batch. In practice, the design parameters of all carbon fiber composite grounding electrodes produced in the same batch can be checked to obtain the grounding resistance verification data for each grounding electrode. All grounding resistance verification data are then summarized to generate the grounding resistance verification data set for all carbon fiber composite grounding electrodes within the batch.

[0100] Step 512: Extract the core parameter deviation from the grounding resistance verification data set to generate a core parameter deviation set. Specifically, this can be done by iterating through each grounding resistance verification data set and extracting the core parameter deviation data. All extracted core parameter deviation data are then sorted according to the production number of the grounding electrode to generate a core parameter deviation set. This set contains the deviation information of the core parameters of all grounding electrodes within the same batch.

[0101] Step 513: Extract the conductive curing layer parameter deviation from the grounding resistance verification data set to generate a conductive curing layer parameter deviation set. Specifically, this can be done by iterating through each grounding resistance verification data set and extracting the conductive curing layer parameter deviation data. All extracted conductive curing layer parameter deviation data are then sorted according to the production number of the grounding electrode to generate a conductive curing layer parameter deviation set. This set contains the deviation information of the conductive curing layer parameters for all grounding electrodes within the same batch.

[0102] Step 514: Extract the grounding electrode-soil interface parameter deviation from the grounding resistance verification data set to generate a grounding electrode-soil interface parameter deviation set. Specifically, each grounding resistance verification data point in the data set can be iterated through to extract the grounding electrode-soil interface parameter deviation data. All extracted grounding electrode-soil interface parameter deviation data are then sorted according to the production number of the grounding electrode to generate a grounding electrode-soil interface parameter deviation set. This set contains the deviation information of the grounding electrode and soil interface parameters within the same batch.

[0103] Based on the above design, this invention extracts parameter deviation sets for the electrode core, conductive curing layer, and grounding body-soil interface from the grounding resistance verification data of all products in a batch. Each deviation set contains only parameter deviation data of the corresponding level, thereby enabling hierarchical management of batch data. This facilitates the analysis of batch fluctuation patterns of parameters at each level, provides data support for locating weak links in the production process, and facilitates targeted process improvement.

[0104] Preferably, the step of performing a layered batch consistency assessment based on the electrode core parameter deviation set, the conductive curing layer parameter deviation set, and the grounding electrode-soil interface parameter deviation set to generate electrode core batch consistency data, conductive curing layer batch consistency data, and grounding electrode-soil interface batch consistency data includes: Step 521: Calculate the core parameter dispersion of the core parameter deviation set to generate core parameter dispersion data. Specifically, the average value of all data in the core parameter deviation set can be calculated to reflect the average deviation level of the core parameters in that batch. The standard deviation of the core parameter deviation set is calculated to reflect the dispersion of the core parameters in that batch. The coefficient of variation of the core parameter deviation set is calculated; the coefficient of variation equals the standard deviation divided by the average value, eliminating the influence of the average value on the dispersion. The average value, standard deviation, and coefficient of variation are then integrated to generate core parameter dispersion data.

[0105] Step 522: Calculate the dispersion of the conductive curing layer parameters based on the set of deviations, generating conductive curing layer parameter dispersion data. Specifically, the average value of all data in the set of conductive curing layer parameter deviations can be calculated, reflecting the average deviation level of the conductive curing layer parameters in that batch. The standard deviation of the set of conductive curing layer parameter deviations is calculated, reflecting the dispersion of the conductive curing layer parameters in that batch. The coefficient of variation of the set of conductive curing layer parameter deviations is calculated; the coefficient of variation equals the standard deviation divided by the average value, eliminating the influence of the average value on the dispersion. The average value, standard deviation, and coefficient of variation are then integrated to generate conductive curing layer parameter dispersion data.

[0106] Step 523: Calculate the dispersion of the grounding electrode-soil interface parameter deviation set to generate grounding electrode-soil interface parameter dispersion data. Specifically, the average value of all data in the grounding electrode-soil interface parameter deviation set can be calculated to reflect the average deviation level of the grounding electrode-soil interface parameters in that batch. The standard deviation of the grounding electrode-soil interface parameter deviation set is calculated to reflect the dispersion of the grounding electrode-soil interface parameters in that batch. The coefficient of variation of the grounding electrode-soil interface parameter deviation set is calculated; the coefficient of variation equals the standard deviation divided by the average value, eliminating the influence of the average value on the dispersion. The average value, standard deviation, and coefficient of variation are integrated to generate grounding electrode-soil interface parameter dispersion data.

[0107] Step 524: Based on the dispersion data of the electrode core parameters, the dispersion data of the conductive curing layer parameters, and the dispersion data of the grounding electrode-soil interface parameters, perform a layered consistency level determination to generate batch consistency data for the electrode core, the conductive curing layer, and the grounding electrode-soil interface. In specific implementation, a coefficient of variation threshold can be preset to divide batch consistency into four levels: Level 1 (coefficient of variation ≤ 5%), indicating very good batch consistency; Level 2 (5% < coefficient of variation ≤ 10%), indicating relatively good batch consistency; Level 3 (10% < coefficient of variation ≤ 15%), indicating average batch consistency; and Level 4 (coefficient of variation > 15%), indicating poor batch consistency. The coefficients of variation in the electrode core parameter dispersion data, the conductive curing layer parameter dispersion data, and the grounding electrode-soil interface parameter dispersion data are compared with the above thresholds to determine the batch consistency level of each layer. The dispersion data and consistency levels of each layer are integrated to generate batch consistency data for the electrode core, the conductive curing layer, and the grounding electrode-soil interface.

[0108] Based on the above design, this invention calculates the dispersion data of the parameter deviation set of each layer, including the mean, standard deviation and coefficient of variation. According to the magnitude of the coefficient of variation, the batch consistency of each layer is judged. This can identify potential quality problems where the total resistance is qualified but the process of a certain layer fluctuates greatly, improve the comprehensiveness of batch quality inspection, and the consistency level judgment results make it easy for production managers to intuitively understand the process stability of each layer.

[0109] Preferably, the step of performing layered directional design optimization based on the batch consistency data of the electrode core, the batch consistency data of the conductive curing layer, and the batch consistency data of the grounding electrode-soil interface to generate electrode core design optimization data, conductive curing layer design optimization data, and grounding electrode-soil interface design optimization data includes: Step 531: Based on the core batch consistency data, perform core design parameter optimization direction matching to generate core design optimization data. Specifically, if the core batch consistency level is Level 1 or 2, it indicates that the core manufacturing process is stable and no optimization is needed. If the core batch consistency level is Level 3, it indicates that the core manufacturing process has some fluctuations and welding parameters need to be optimized, such as welding current and welding time, to improve the welding quality between the connecting holes and the multi-point metal mesh core. If the core batch consistency level is Level 4, it indicates that there are significant problems with the core manufacturing process, requiring replacement of the metal mesh material and optimization of the metal mesh weaving process to ensure the stability of the core's conductivity and mechanical properties. The above optimization measures are then compiled to generate core design optimization data.

[0110] Step 532: Based on the batch consistency data of the conductive curing layer, perform direction matching for conductive curing layer design parameter optimization to generate conductive curing layer design optimization data. Specifically, if the batch consistency level of the conductive curing layer is Level 1 or 2, it indicates that the conductive curing layer production process is stable and no optimization is needed. If the batch consistency level is Level 3, it indicates that there are certain fluctuations in the conductive curing layer's material mixing process, requiring optimization of stirring time and speed to ensure uniform mixing of all components. If the batch consistency level is Level 4, it indicates significant problems in the conductive curing layer's production process, requiring adjustment of the addition ratio of key components such as recycled carbon fiber and water-soluble conductive liquid, improvement of curing temperature and curing time, and enhancement of the density and conductivity stability of the conductive curing layer. The above optimization measures are then compiled to generate conductive curing layer design optimization data.

[0111] Step 533: Based on the batch consistency data of the grounding electrode-soil interface, perform optimization direction matching for the grounding electrode-soil interface design parameters to generate grounding electrode-soil interface design optimization data. Specifically, if the batch consistency level of the grounding electrode-soil interface is Level 1 or 2, it indicates that the grounding electrode surface treatment process is stable and requires no optimization; if the batch consistency level is Level 3, it indicates that the grounding electrode surface treatment process has some fluctuations and requires optimization of the mold surface finish to ensure consistent surface roughness of the grounding electrode; if the batch consistency level is Level 4, it indicates that there are significant problems with the grounding electrode surface treatment process and requires adding a surface grinding process to control the surface roughness of the grounding electrode within a preset range and improve the contact stability between the grounding electrode and the soil. The above optimization measures are then compiled to generate grounding electrode-soil interface design optimization data.

[0112] Based on the above design, this invention matches the corresponding design parameter optimization direction according to the batch consistency level of each layer, and provides specific process improvement measures for different consistency problems. The design optimization suggestions are clearly targeted and operable, which can quickly solve the problems existing in the production process, reduce the reliance on human experience, and improve the efficiency and effectiveness of design optimization.

[0113] Example 2 Based on the same inventive concept, the present invention also provides a system for measuring the grounding resistance of carbon fiber composite grounding electrodes, comprising: The data acquisition and preprocessing module is used to acquire electrical signal data at each test point preset on the carbon fiber composite grounding body, and preprocess the electrical signal data to generate an initial resistance measurement dataset. The test points include connection hole test points, multi-point metal mesh electrode core test points, and conductive curing layer test points. A multi-dimensional decoupling module is used to perform multi-dimensional decoupling processing on the initial resistance measurement dataset to generate the core body resistance component, the conductive solidification layer body resistance component, and the grounding body-soil contact resistance component. The correlation model construction module is used to construct a correlation model of the grounding resistance of the carbon fiber composite grounding electrode based on the resistance components of the electrode core, the resistance components of the conductive curing layer, and the resistance components of the grounding electrode-soil contact. The parameter verification module is used to verify the design parameters of the carbon fiber composite grounding body based on the grounding resistance correlation model of the carbon fiber composite grounding body, and obtain grounding resistance verification data. The result generation module is used to generate batch performance consistency evaluation results and design optimization guidance information for carbon fiber composite grounding bodies based on the grounding resistance verification data.

[0114] Based on the above design, this invention integrates the entire measurement and analysis process into one system, which can realize the automation and intelligence of the grounding resistance measurement of carbon fiber composite grounding body, reduce manual intervention, improve measurement efficiency, and the system can directly output grounding resistance verification data, batch consistency evaluation results and design optimization guidance information, which are convenient for users to use directly.

[0115] Optionally, the data acquisition and preprocessing module includes: The test cable access unit is used to connect test cables to detection modules at preset test points (connection hole, multi-point metal mesh core, and conductive curing layer) via test cable channels pre-reserved inside the carbon fiber composite grounding electrode. Specifically, test cable channels can be pre-reserved inside the carbon fiber composite grounding electrode, leading to the connection hole, multi-point metal mesh core, and conductive curing layer test points respectively. The test cable access unit connects the shielded test cables to the detection modules at the three test points via these channels. The detection modules use copper electrodes that maintain close contact with the test points to ensure reliable electrical signal transmission.

[0116] The layered differential excitation injection unit is used to inject layered differential excitation current into paired test points at adjacent layers according to the conductivity layer level of each test point, and simultaneously acquire potential difference signals at the corresponding points. In specific implementation, the pairing relationship of test points at adjacent layers can be determined based on the conductivity layer level of each test point. Differential excitation currents of equal amplitude and opposite phase are injected into the two paired test points. The amplitude of the excitation current is 10mA-100mA, and the frequency is 1kHz-10kHz. Simultaneously with the injection of the excitation current, the potential difference signal between the paired test points is acquired to ensure that the potential difference signal corresponds to the excitation current at all times.

[0117] The interference removal unit is used to perform power frequency interference and contact noise removal processing on the acquired potential difference signal to generate the electrical signal data. Specifically, a digital notch filter can be used to process the acquired potential difference signal, filtering out power frequency interference of 50Hz and its harmonics. A moving average filtering algorithm is then used to process the signal after power frequency interference removal to remove random fluctuations caused by contact noise. Outlier detection is performed on the processed signal to remove abnormal signals exceeding a preset threshold range, generating clean electrical signal data.

[0118] The normalization processing unit performs dimensional normalization processing on the interference-removed electrical signal data to generate the initial resistance measurement dataset. Specifically, all resistance feature values ​​can be extracted from the electrical signal data output by the interference removal unit. A minimum-maximum normalization method is used to map each resistance feature value to the [0,1] interval, eliminating dimensional differences between resistance feature values ​​at different levels. The normalized resistance feature values ​​are then organized according to the test point level and acquisition sequence to generate the initial resistance measurement dataset.

[0119] Based on the above design, this invention improves the anti-interference capability of the signal by adopting a hierarchical differential excitation injection and synchronous acquisition method, effectively suppresses power frequency interference and common mode interference, and normalization processing unifies the dimensions of data in each layer, which facilitates subsequent decoupling processing and model calculation.

[0120] Preferably, the detection module corresponding to the test point of the connection hole is disposed on the inner wall of the connection hole of the carbon fiber composite grounding body; in specific implementation, the connection hole 1 can be designed as a cylindrical through hole, welded to the middle position of the multi-pointed metal mesh electrode core 2, for connecting the grounding main material. The detection module of the test point of the connection hole adopts a ring copper electrode, which is tightly attached to the inner wall of the connection hole 1 to ensure good contact with the connection hole 1. The detection module is connected to the test cable access unit through the test cable channel to collect the electrical signal at the connection hole 1.

[0121] The detection module corresponding to the test point of the multi-pointed metal mesh pole is set on the multi-pointed metal mesh pole 2 of the carbon fiber composite grounding body. The connection hole 1 is welded to the middle of the multi-pointed metal mesh pole 2. In specific implementation, the multi-pointed metal mesh pole 2 can be made of galvanized steel or stainless steel braid, with multiple pointed structures, which can improve the current discharge speed. The detection module of the test point of the multi-pointed metal mesh pole 2 uses needle-shaped copper electrodes, which are inserted into the mesh of the multi-pointed metal mesh pole 2 and in close contact with the metal wire. The detection module is connected to the test cable access unit through the test cable channel to collect the electrical signal at the multi-pointed metal mesh pole 2.

[0122] The detection module corresponding to the test point of the conductive curing layer is set on the conductive curing layer 3 of the carbon fiber composite grounding body. The conductive curing layer 3 is formed by composite curing of recycled carbon fiber, recycled aggregate, geopolymer cementitious material, silica fume and water-soluble conductive liquid, and covers the outer surface of the multi-point metal mesh electrode core 2. In specific implementation, the conductive curing layer 3 uniformly covers the outer surface of the multi-point metal mesh electrode core 2. The detection module of the conductive curing layer test point uses a sheet copper electrode, which is pasted on the outer surface of the conductive curing layer 3 to ensure good contact with the conductive curing layer 3. The detection module is connected to the test cable access unit through the test cable channel to collect the electrical signal at the conductive curing layer 3. The recycled carbon fiber and water-soluble conductive liquid in the conductive curing layer 3 provide conductive channels, the recycled aggregate provides mechanical strength, the silica fume increases density, and the geopolymer cementitious material provides adhesion and corrosion resistance.

[0123] Based on the above design, this invention can ensure the accuracy and representativeness of electrical signal acquisition at each layer, providing reliable raw data for layered resistance decoupling. The standardized test point design facilitates the standardization and repeatability of measurements.

[0124] Furthermore, the conductive cured layer comprises the following components by mass fraction: The composition consists of 1%–10% recycled carbon fiber, 15%–45% recycled aggregate, 3%–5% silica fume, 10%–20% geopolymer cementitious material, 1%–5% water-soluble conductive liquid, and the remainder is water.

[0125] In specific implementation, the preparation process of the carbon fiber composite grounding electrode of the present invention is as follows: Figure 4 As shown, for example: (1) Raw materials for recycled carbon fiber composite tip metal mesh grounding electrode: 1% to 10% recycled carbon fiber, 15% to 45% recycled aggregate, 3% to 5% silica fume, and 10% to 20% geopolymer cementitious material. Mix the above materials together and stir for 20 minutes.

[0126] (2) Transfer the mixed raw materials into a mixer for secondary mixing. During mixing, add 1% to 5% water-soluble conductive liquid and tap water that meets drinking water standards. Mix for 30 minutes to form a wet slurry.

[0127] (3) In accordance with the requirements of the national standard "Code for Grounding Design of AC Electrical Installations" (GB / T 50065-2011), a multi-point metal mesh is processed and manufactured, and the main material connection points are welded together to form the pole core.

[0128] (4) Molding methods: The first method involves pressing the multi-pointed metal mesh, the main material connection point core, and the mixed wet slurry into a press for molding; the second method involves molding the product on a high-frequency vibrating table equipped with vacuum. After pressing and vibration, the product undergoes high-temperature wet rapid curing. By simply changing the molds of different sizes and models, various sizes and thicknesses of recycled carbon fiber composite pointed metal mesh grounding products can be produced.

[0129] Recycled carbon fibers in the conductive cured layer possess high conductivity and corrosion resistance, forming a continuous conductive network within the layer and reducing its bulk resistance. If the mass fraction of recycled carbon fibers is too low, an effective conductive network cannot be formed, resulting in high resistance; if the mass fraction is too high, it affects the mechanical strength and molding performance of the layer. Therefore, the mass fraction of recycled carbon fibers is controlled between 1% and 10%. Recycled aggregates, processed from crushed waste concrete and bricks, improve the mechanical strength and volume stability of the conductive cured layer while reducing production costs. If the mass fraction of recycled aggregates is too low, the mechanical strength of the conductive cured layer is insufficient; if the mass fraction is too high, it affects its conductivity. Therefore, the mass fraction of recycled aggregates is controlled between 15% and 45%. Silica fume, an ultrafine powder material, fills the pores within the conductive cured layer, improving density and impermeability. It also promotes the hydration reaction of the geopolymer cementitious material, enhancing the early strength of the conductive cured layer. If the mass fraction of silica fume is too low, the filling effect is insignificant; if the mass fraction is too high, it increases the brittleness of the conductive cured layer. Therefore, the mass fraction of silica fume is controlled between 3% and 5%. Geopolymer cementitious materials have high polymerization degree and corrosion resistance, enabling them to bond recycled carbon fibers, recycled aggregates, and silica fume together to form a strong whole. If the mass fraction of geopolymer cementitious materials is too low, the bonding strength is insufficient, and the conductive cured layer is prone to cracking; if the mass fraction is too high, it increases production costs and affects conductivity. Therefore, the mass fraction of geopolymer cementitious materials is controlled between 10% and 20%. Water-soluble conductive liquid can improve the ionic conductivity of the conductive cured layer, further reducing its bulk resistance. If the mass fraction of water-soluble conductive liquid is too low, the conductivity effect is not obvious; if the mass fraction is too high, it affects the curing performance and long-term stability of the conductive cured layer. Therefore, the mass fraction of water-soluble conductive liquid is controlled between 1% and 5%.

[0130] Based on the above design, the use of recycled materials in this invention can reduce product costs, reduce solid waste pollution to the environment, meet the requirements of low-carbon and environmentally friendly development, and the optimized component ratio makes the conductive curing layer have low resistivity, high compressive strength, good corrosion resistance and soil adhesion.

[0131] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention.

Claims

1. A method for measuring the grounding resistance of a carbon fiber composite grounding electrode, characterized in that, Includes the following steps: Acquire electrical signal data at each test point on the carbon fiber composite grounding electrode, and preprocess the electrical signal data to generate an initial resistance measurement dataset. The initial resistance measurement dataset is subjected to multi-dimensional decoupling processing to generate the core body resistance component, the conductive solidification layer body resistance component, and the grounding body-soil contact resistance component. Based on the resistance components of the core body, the resistance components of the conductive curing layer body, and the resistance components of the grounding electrode-soil contact, a grounding resistance correlation model for carbon fiber composite grounding electrode is constructed. Based on the grounding resistance correlation model of the carbon fiber composite grounding electrode, the design parameters of the carbon fiber composite grounding electrode are checked to obtain grounding resistance verification data.

2. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 1, characterized in that, The process of acquiring electrical signal data at each test point preset on the carbon fiber composite grounding electrode, and preprocessing the electrical signal data to generate an initial resistance measurement dataset, includes: Perform data acquisition configuration processing on each test point to generate test point data acquisition configuration information; Based on the configuration information of the test points, layered differential excitation is injected into each test point, potential difference is collected synchronously and interference is eliminated to form electrical signal data of each test point preset on the carbon fiber composite grounding body. Perform hierarchical feature mapping and cross-layer consistency verification on the electrical signal data of each test point to form a consistency verification passed dataset; The consistency verification is performed by normalizing the dimensions of the dataset to form an initial resistance measurement dataset; The test points include connection hole test points, multi-point metal mesh electrode core test points, and conductive curing layer test points.

3. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 2, characterized in that, The step of performing data acquisition configuration processing on each test point to generate test point data acquisition configuration information includes: Mark the conductive layer level corresponding to each test point to form test point level marking information; Based on the test point level marking information, test points at adjacent levels are paired to form adjacent level test point pairing information; Based on the pairing information of adjacent test points, test point acquisition configuration information is generated.

4. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 2, characterized in that, Based on the configuration information of the test points, layered differential excitation injection, synchronous potential difference acquisition, and interference rejection processing are performed on each test point to generate electrical signal data preset on each test point on the carbon fiber composite grounding body, including: Based on the configuration information collected at the test points, hierarchical differential excitation is injected into the test points paired with adjacent levels to form a hierarchical differential excitation response field; Based on the layered differential excitation response field, the potential difference between adjacent layered paired test points is synchronously collected to form an original potential difference set between test points; According to the preset excitation timing sequence, the timing sequence of the original potential difference set between the test points is aligned to form a timing-aligned potential difference set; Power frequency interference and contact noise in the time-aligned potential difference set are filtered out to form electrical signal data at each test point on the carbon fiber composite grounding body.

5. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 2, characterized in that, The process of performing hierarchical feature mapping and cross-layer consistency verification on the electrical signal data at each test point forms a consistency verification passed dataset, including: The electrical signal data of each test point is split into subsets of electrical signals for the connection hole test point, subsets of electrical signals for the multi-point metal mesh core test point, and subsets of electrical signals for the conductive curing layer test point. Layered resistance feature mapping is performed on the electrical signal subsets of the connection hole test points, the multi-tip metal mesh core test points, and the conductive curing layer test points, respectively, to form resistance feature mapping data for connection hole test points, resistance feature mapping data for multi-tip metal mesh core test points, and resistance feature mapping data for conductive curing layer test points. Based on the resistance feature mapping data of the connection hole test point, the resistance feature mapping data of the multi-tip metal mesh core test point, and the resistance feature mapping data of the conductive curing layer test point, cross-layer data consistency verification is performed to form a consistency verification passed dataset.

6. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 1, characterized in that, The process of performing multi-dimensional decoupling on the initial resistance measurement dataset to generate the electrode core resistance component, the conductive solidification layer resistance component, and the grounding electrode-soil contact resistance component includes: Based on the initial resistance measurement dataset, a layered impedance matrix is ​​constructed, forming a three-layer structured layered impedance matrix; The body impedance component of the three-layer structure is decoupled from the layered impedance matrix to form the core body resistance component and the conductive curing layer body resistance component. By combining the three-layer structure layered impedance matrix, the core body resistance component and the conductive solidified layer body resistance component, the grounding body-soil interface impedance is separated and decoupled to form the grounding body-soil contact resistance component. The consistency of the decoupling results of the electrode core body resistance component, the conductive curing layer body resistance component, and the grounding body-soil contact resistance component is verified to form a set of verified resistance components.

7. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 6, characterized in that, The construction of a layered impedance matrix based on the initial resistance measurement dataset, forming a three-layer structured layered impedance matrix, includes: Obtain the hierarchical impedance mapping relationship corresponding to the test points of the connection holes, the test points of the multi-tipped metal mesh core, and the test points of the conductive curing layer. Based on the hierarchical impedance mapping relationship, a matrix dimension mapping is performed on the initial resistance measurement dataset to form an initial hierarchical impedance matrix; The diagonal elements of the initial layered impedance matrix are normalized to form a three-layered impedance matrix.

8. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 6, characterized in that, The process of decoupling the body impedance components of the three-layer structure's layered impedance matrix to form the core body resistance component and the conductive curing layer body resistance component includes: Extract the core body impedance sub-matrix from the layered impedance matrix of the three-layer structure; Extract the eigenvalues ​​of the impedance sub-matrix of the core body to form the core body resistance component; Extract the conductive curing layer bulk impedance sub-matrix from the layered impedance matrix of the three-layer structure; The eigenvalues ​​of the impedance sub-matrix of the conductive curing layer are extracted to form the resistivity component of the conductive curing layer.

9. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 6, characterized in that, The method of combining the three-layer structure impedance matrix, the core body resistance component, and the conductive solidified layer body resistance component to separate and decouple the grounding electrode-soil interface impedance, forming the grounding electrode-soil contact resistance component, includes: Extract the total impedance characteristics of the three-layer structure layered impedance matrix to form the total impedance characteristic data of the carbon fiber composite grounding body; Based on the total impedance characteristic data of the carbon fiber composite grounding electrode, the resistance component of the electrode core, and the resistance component of the conductive curing layer, the interface impedance difference is calculated to form the original data of the grounding electrode-soil interface impedance. The interface conduction characteristics of the original data of the grounding electrode-soil interface impedance are corrected to form the grounding electrode-soil contact resistance component.

10. The method for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 9, characterized in that, The process of correcting the interface conduction characteristics of the original grounding electrode-soil interface impedance data to form the grounding electrode-soil contact resistance component includes: The surface resistivity of the conductive curing layer, soil resistivity, effective surface area of ​​the carbon fiber composite grounding electrode, and current diffusion coefficient were obtained. The interface conduction characteristic correction coefficient is calculated based on the surface resistivity of the conductive curing layer, the soil resistivity, the effective surface area of ​​the carbon fiber composite grounding electrode, and the current diffusion coefficient. Based on the interface conduction characteristic correction coefficient, the original data of the grounding electrode-soil interface impedance are corrected to form the grounding electrode-soil contact resistance component.

11. The method for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 10, characterized in that: The interface conduction characteristic correction coefficient is calculated based on the following formula: The grounding electrode-soil contact resistance component is calculated based on the following formula: In the formula, Indicates the correction coefficient for interface conduction characteristics; This represents the surface resistivity of the conductive cured layer; Indicates soil resistivity; Indicates the preset resistivity coupling index; Indicates the preset current diffusion coefficient; This indicates the effective surface area of ​​the carbon fiber composite grounding electrode; Indicates the effective surface area of ​​the grounding electrode reference; This represents the raw data of the grounding electrode-soil interface impedance; This represents the corrected grounding electrode-soil contact resistance component.

12. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 1, characterized in that, The step of constructing a grounding resistance correlation model for carbon fiber composite grounding electrodes based on the resistance components of the electrode core, the conductive curing layer, and the grounding electrode-soil contact resistance components includes: A layered parameter-resistance component correspondence is established for the resistive components of the electrode core, the resistive components of the conductive curing layer, and the resistive components of the grounding body-soil contact, forming a set of layered parameter-resistance component mapping relationships; Based on the aforementioned mapping relationship set, a single-component resistor model is constructed, forming a core body resistor model, a conductive solidified layer body resistor model, and a grounding body-soil contact resistor model. The resistivity sub-models of the electrode core, the resistivity sub-model of the conductive solidified layer, and the resistivity sub-model of the grounding body-soil contact are coupled and integrated to form an initial grounding resistance correlation model; The generalization of the initial grounding resistance correlation model is verified to form a grounding resistance correlation model for carbon fiber composite grounding bodies.

13. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 12, characterized in that, The process of constructing a layered parameter-resistance component correspondence for the resistive components of the electrode core, the conductive solidified layer, and the grounding electrode-soil contact resistance component, forming a set of layered parameter-resistance component mapping relationships, includes: Obtain the design parameter set of the electrode core, the design parameter set of the conductive curing layer, and the design parameter set of the grounding electrode-soil interface; Based on the set of design parameters of the core body and the resistance components of the core body, a core parameter-resistance mapping relationship is constructed; Based on the set of design parameters of the conductive curing layer and the resistance components of the conductive curing layer, a parameter-resistance mapping relationship of the conductive curing layer is constructed. Based on the set of design parameters for the grounding electrode-soil interface and the components of the grounding electrode-soil contact resistance, a mapping relationship between grounding electrode-soil interface parameters and resistance is constructed. Based on the electrode core parameter-resistance mapping relationship, the conductive curing layer parameter-resistance mapping relationship, and the grounding body-soil interface parameter-resistance mapping relationship, a set of layer parameter-resistance component mapping relationships is constructed.

14. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 12, characterized in that, The single-component resistance model is constructed based on the mapping relationship set, forming a core body resistance model, a conductive solidification layer body resistance model, and a grounding electrode-soil contact resistance model, including: Based on the core parameter-resistance mapping relationship in the set of hierarchical parameter-resistance component mapping relationships, the core body resistance sub-model is trained to form the core body resistance sub-model. Based on the conductive curing layer parameter-resistance mapping relationship in the set of layered parameter-resistance component mapping relationships, the conductive curing layer body resistance sub-model is trained to form the conductive curing layer body resistance sub-model. Based on the grounding electrode-soil interface parameter-resistance mapping relationship in the set of hierarchical parameter-resistance component mapping relationships, the grounding electrode-soil contact resistance sub-model is trained to form the grounding electrode-soil contact resistance sub-model.

15. The method for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 12, characterized in that, The process of coupling and integrating multiple sub-models—the electrode core resistivity sub-model, the conductive solidification layer resistivity sub-model, and the grounding electrode-soil contact resistivity sub-model—to form an initial grounding resistance correlation model includes: Obtain the interlayer conduction coupling coefficient between the core body resistivity model and the conductive curing layer resistivity model; Obtain the interface conduction coupling coefficient between the conductive curing layer bulk resistance model and the grounding electrode-soil contact resistance model; Based on the interlayer conduction coupling coefficient and the interface conduction coupling coefficient, the core body resistance sub-model, the conductive solidified layer body resistance model, and the grounding body-soil contact resistance sub-model are weighted and coupled to form an initial grounding resistance correlation model.

16. The method for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 15, characterized in that, The method involves weighted coupling of the electrode core resistivity model, the conductive solidified layer resistivity model, and the grounding electrode-soil contact resistivity model based on the interlayer conduction coupling coefficient and the interface conduction coupling coefficient to form an initial grounding resistance correlation model, including: The interlayer contact resistance between the core and the conductive curing layer, the interface capacitance between the conductive curing layer and the soil, and the preset test current frequency are obtained. Based on the interlayer conduction coupling coefficient, the interface conduction coupling coefficient, the interlayer contact resistance, the interface capacitance, and the preset test current frequency, weighted coupling is performed to generate a preset cross-coupling correction coefficient. Based on the interlayer conduction coupling coefficient, the interface conduction coupling coefficient, and the preset cross-coupling correction coefficient, the electrode core body resistance sub-model, the conductive solidified layer body resistance sub-model, and the grounding body-soil contact resistance sub-model are weighted and coupled to form an initial grounding resistance correlation model.

17. The method for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 16, characterized in that: The total grounding resistance output of the initial grounding resistance correlation model is calculated based on the following formula: In the formula, This indicates the total grounding resistance of the carbon fiber composite grounding electrode; This represents the interlayer conduction coupling coefficient between the core body resistivity model and the conductive solidified layer body resistivity model; This represents the output value of the core body resistive sub-model; This indicates the interlayer contact resistance between the electrode core and the conductive cured layer; This represents the interface conduction coupling coefficient between the conductive solidified layer bulk resistance model and the grounding electrode-soil contact resistance model. This represents the output value of the conductive curing layer bulk resistivity model; Indicates the preset test current frequency; This represents the interfacial capacitance between the conductive solidified layer and the soil. This represents the output value of the grounding electrode-soil contact resistance sub-model; This indicates the preset cross-coupling correction coefficient.

18. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 1, characterized in that, The design parameters of the carbon fiber composite grounding electrode are verified based on the grounding resistance correlation model to obtain grounding resistance verification data, including: Based on the grounding resistance correlation model of the carbon fiber composite grounding body, the theoretical resistance component prediction is performed on the design parameters of the carbon fiber composite grounding body to generate the theoretical core body resistance component, the theoretical conductive solidified layer body resistance component, and the theoretical grounding body-soil contact resistance component. Layered parameter deviation calculations are performed on the theoretical electrode core body resistance component, the theoretical conductive solidified layer body resistance component, and the theoretical grounding electrode-soil contact resistance component to generate electrode core parameter deviation data, conductive solidified layer parameter deviation data, and grounding electrode-soil interface parameter deviation data. Based on the electrode core parameter deviation data, the conductive curing layer parameter deviation data, and the grounding body-soil interface parameter deviation data, a multi-dimensional parameter deviation comprehensive verification is performed to generate parameter deviation comprehensive verification data. The parameter deviation comprehensive verification data is processed by classifying the verification results to obtain grounding resistance verification data; The design parameters include the material, diameter, and mesh size of the multi-point metal mesh core, the composition and thickness of the conductive curing layer, and the surface area of ​​the grounding electrode.

19. The method for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 18, characterized in that, The grounding resistance correlation model based on the carbon fiber composite grounding electrode is used to predict the theoretical resistance components of the design parameters of the carbon fiber composite grounding electrode, generating theoretical electrode core resistance components, theoretical conductive solidified layer resistance components, and theoretical grounding electrode-soil contact resistance components, including: Obtain the set of design parameters for the carbon fiber composite grounding electrode to be checked; Based on the core resistance sub-model in the grounding resistance correlation model of the carbon fiber composite grounding body, the theoretical core resistance is predicted by the design parameter set, and the theoretical core resistance component is generated. Based on the conductive curing layer body resistance sub-model in the grounding resistance correlation model of the carbon fiber composite grounding body, the theoretical resistance of the curing layer is predicted for the set of design parameters, and the theoretical conductive curing layer body resistance component is generated. Based on the grounding electrode-soil contact resistance sub-model in the grounding resistance correlation model of the carbon fiber composite grounding electrode, the interface theoretical resistance is predicted for the design parameter set to generate the theoretical grounding electrode-soil contact resistance component.

20. The method for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 18, characterized in that, The step of performing layered parameter deviation calculations on the theoretical electrode core body resistance component, the theoretical conductive solidified layer body resistance component, and the theoretical grounding electrode-soil contact resistance component to generate electrode core parameter deviation data, conductive solidified layer parameter deviation data, and grounding electrode-soil interface parameter deviation data includes: Obtain the measured components of the electrode core resistance, the measured components of the conductive solidified layer resistance, and the measured components of the grounding electrode-soil contact resistance. Based on the theoretical core resistance component and the measured core resistance component, the core parameter deviation is calculated to generate core parameter deviation data. Based on the theoretical conductive curing layer bulk resistance component and the measured conductive curing layer bulk resistance component, the curing layer parameter deviation is calculated to generate conductive curing layer parameter deviation data. Based on the theoretical grounding electrode-soil contact resistance component and the measured grounding electrode-soil contact resistance component, the interface parameter deviation is calculated to generate grounding electrode-soil interface parameter deviation data.

21. The method for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 18, characterized in that, The process involves a multi-dimensional comprehensive verification of parameter deviations based on the electrode core parameter deviation data, the conductive curing layer parameter deviation data, and the grounding electrode-soil interface parameter deviation data, generating comprehensive parameter deviation verification data, including: Obtain the weighting coefficients for the deviation of the electrode core parameters, the weighting coefficients for the deviation of the conductive curing layer parameters, and the weighting coefficients for the deviation of the grounding electrode-soil interface parameters. Based on the electrode core parameter deviation weighting coefficient, the conductive curing layer parameter deviation weighting coefficient, and the grounding body-soil interface parameter deviation weighting coefficient, the electrode core parameter deviation data, the conductive curing layer parameter deviation data, and the grounding body-soil interface parameter deviation data are weighted and synthesized to generate a comprehensive parameter deviation value. Based on the comprehensive value of the parameter deviation and the preset parameter deviation threshold, a comprehensive parameter deviation determination is performed to generate comprehensive parameter deviation verification data.

22. The method for measuring the grounding resistance of the carbon fiber composite grounding electrode according to claim 1, characterized in that: The process involves verifying the design parameters of the carbon fiber composite grounding electrode based on the grounding resistance correlation model to obtain grounding resistance verification data. This process further includes: The grounding resistance verification data is decomposed into layered parameter deviations to generate a set of electrode core parameter deviations, a set of conductive solidification layer parameter deviations, and a set of grounding body-soil interface parameter deviations. Based on the set of deviations of the electrode core parameters, the set of deviations of the conductive curing layer parameters, and the set of deviations of the grounding electrode-soil interface parameters, a layered batch consistency assessment is performed to generate batch consistency data of the electrode core, batch consistency data of the conductive curing layer, and batch consistency data of the grounding electrode-soil interface. Based on the batch consistency data of the electrode core, the batch consistency data of the conductive curing layer, and the batch consistency data of the grounding electrode-soil interface, layered directional design optimization is performed to generate electrode core design optimization data, conductive curing layer design optimization data, and grounding electrode-soil interface design optimization data. Based on the batch consistency data of the electrode core, the batch consistency data of the conductive curing layer, the batch consistency data of the grounding electrode-soil interface, the design optimization data of the electrode core, the design optimization data of the conductive curing layer, and the design optimization data of the grounding electrode-soil interface, batch performance consistency evaluation results and design optimization guidance information of carbon fiber composite grounding electrodes are generated.

23. The method for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 22, characterized in that, The step of decomposing the grounding resistance verification data into layered parameter deviation sets to generate a core parameter deviation set, a conductive solidification layer parameter deviation set, and a grounding body-soil interface parameter deviation set includes: Obtain the set of grounding resistance verification data for all carbon fiber composite grounding bodies within the batch; The core parameter deviation is extracted from the grounding resistance verification data set to generate a core parameter deviation set; The conductive curing layer parameter deviation is extracted from the grounding resistance verification data set to generate a conductive curing layer parameter deviation set. The grounding resistance verification data set is used to extract the deviation of grounding body-soil interface parameters to generate a grounding body-soil interface parameter deviation set.

24. The method for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 22, characterized in that, The process of performing a layered batch consistency assessment based on the set of electrode core parameter deviations, the set of conductive curing layer parameter deviations, and the set of grounding electrode-soil interface parameter deviations, generating electrode core batch consistency data, conductive curing layer batch consistency data, and grounding electrode-soil interface batch consistency data, includes: The core parameter dispersion is calculated on the core parameter deviation set to generate core parameter dispersion data; The set of deviations of the conductive curing layer parameters is used to calculate the dispersion of the curing layer parameters, and the dispersion data of the conductive curing layer parameters is generated. The interface parameter dispersion is calculated for the set of deviations of the grounding electrode-soil interface parameters to generate grounding electrode-soil interface parameter dispersion data; Based on the dispersion data of the electrode core parameters, the dispersion data of the conductive curing layer parameters, and the dispersion data of the grounding electrode-soil interface parameters, a layered consistency level is determined, generating batch consistency data of the electrode core, the conductive curing layer, and the grounding electrode-soil interface.

25. The method for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 22, characterized in that, The step of performing layered directional design optimization based on the batch consistency data of the electrode core, the batch consistency data of the conductive curing layer, and the batch consistency data of the grounding electrode-soil interface generates electrode core design optimization data, conductive curing layer design optimization data, and grounding electrode-soil interface design optimization data, including: Based on the batch consistency data of the core, the optimization direction of the core design parameters is matched to generate core design optimization data; Based on the batch consistency data of the conductive curing layer, the design parameters of the conductive curing layer are optimized by matching the direction of optimization, and the design optimization data of the conductive curing layer is generated. Based on the batch consistency data of the grounding electrode-soil interface, the optimization direction of the grounding electrode-soil interface design parameters is matched to generate grounding electrode-soil interface design optimization data.

26. A system for measuring the grounding resistance of a carbon fiber composite grounding electrode, characterized in that, include: The data acquisition and preprocessing module is used to acquire electrical signal data at each test point preset on the carbon fiber composite grounding body, and preprocess the electrical signal data to generate an initial resistance measurement dataset. The test points include connection hole test points, multi-point metal mesh electrode core test points, and conductive curing layer test points. A multi-dimensional decoupling module is used to perform multi-dimensional decoupling processing on the initial resistance measurement dataset to generate the core body resistance component, the conductive solidification layer body resistance component, and the grounding body-soil contact resistance component. The correlation model construction module is used to construct a correlation model of the grounding resistance of the carbon fiber composite grounding electrode based on the resistance components of the electrode core, the resistance components of the conductive curing layer, and the resistance components of the grounding electrode-soil contact. The parameter verification module is used to verify the design parameters of the carbon fiber composite grounding body based on the grounding resistance correlation model of the carbon fiber composite grounding body, and obtain grounding resistance verification data.

27. The system for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 26, characterized in that, The system for measuring the grounding resistance of the carbon fiber composite grounding electrode also includes: The result generation module is used to generate batch performance consistency evaluation results and design optimization guidance information for carbon fiber composite grounding bodies based on the grounding resistance verification data.

28. The system for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 26, characterized in that, The data acquisition and preprocessing module includes: The test cable access unit is used to connect the test cable to the detection module at the test point of the connection hole, the test point of the multi-point metal mesh core, and the test point of the conductive curing layer through the test cable channel reserved inside the carbon fiber composite grounding body. The layered differential excitation injection unit is used to inject layered differential excitation current into the paired test points in adjacent layers according to the conductive layer level where each test point is located, and to synchronously collect the potential difference signal at the corresponding point. An interference rejection unit is used to perform power frequency interference and contact noise rejection processing on the acquired potential difference signal to generate the electrical signal data; The normalization processing unit is used to perform dimensional normalization processing on the electrical signal data after interference removal to generate the initial resistance measurement dataset.

29. The system for measuring the grounding resistance of a carbon fiber composite grounding electrode according to claim 28, characterized in that: The detection module corresponding to the test point of the connection hole is set on the inner wall of the connection hole of the carbon fiber composite grounding body. The detection module corresponding to the test point of the multi-point metal mesh electrode core is set on the multi-point metal mesh electrode core of the carbon fiber composite grounding body, and the connection hole is welded in the middle of the multi-point metal mesh electrode core. The detection module corresponding to the test point of the conductive curing layer is set on the conductive curing layer of the carbon fiber composite grounding body. The conductive curing layer is formed by composite curing of recycled carbon fiber, recycled aggregate, geopolymer cementitious material, silica fume and water-soluble conductive liquid, and covers the outer surface of the multi-point metal mesh electrode core.

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