Substation grounding grid corrosion detection and residual life evaluation method and system

Abstract

The invention relates to a substation grounding grid corrosion detection and residual life evaluation method and system. The method comprises the following steps: acquiring a measurement point of a substation grounding grid; calibrating the electrochemical workstation by using a standard impedance source; applying a sine alternating current signal in a preset wide frequency range by using the calibrated electrochemical workstation; selecting a preset number of frequency points, collecting impedance values of each measurement point at different frequency points, and calculating an average value of all the impedance values as an impedance value measurement result of the current measurement point; establishing a Randles equivalent circuit model of the measurement point, fitting the impedance value measurement result of the current measurement point and the impedance value calculation result of the Randles equivalent circuit model by using a nonlinear least square method to obtain an optimal fitting parameter, and calculating the corrosion rate of the transformer substation grounding grid; and measuring the thickness of the current transformer substation grounding grid by using a nondestructive testing technology to obtain the residual life of the transformer substation grounding grid.

Description

Technical Field

[0001] The present application relates to the technical field of substation detection, and mainly to a method and system for substation grounding grid corrosion detection and remaining life assessment. Background Art

[0002] In the power system, the substation grounding grid is a key part to ensure the safe and stable operation of power facilities. It can not only reliably connect the metal casing and structure of electrical equipment to the earth, ensuring that in the event of a fault, the fault current can be quickly introduced into the earth, thereby protecting the safety of personnel and equipment; it can also maintain the normal operation of the power system and prevent various electrical accidents caused by poor grounding. However, since the grounding grid has been buried deep underground for a long time, the soil environment is complex and changeable, including moisture, pH, microorganisms and other factors. These factors work together to cause the grounding grid to inevitably corrode gradually.

[0003] At present, the existing detection methods have many limitations. Although the traditional excavation detection method can directly observe the corrosion of the grounding grid, this method is not only time-consuming and labor-intensive, but also costly. It will also cause serious interference to the normal operation of the substation and may even damage the grounding grid itself. As for other non-excavation detection methods, such as resistance measurement and potential measurement, the accuracy and reliability of the detection results are difficult to guarantee due to the influence of various factors such as soil characteristics and grounding grid structure. More importantly, the existing detection technologies are almost unable to accurately estimate the remaining life of the grounding grid, which makes the power operation and maintenance personnel lack scientific basis when formulating maintenance plans and equipment update strategies, greatly increasing the safety risks of power system operation.

[0004] For example, the Chinese invention patent with the publication number "CN110907343A" discloses a "grounding grid corrosion rate detection method", which specifically discloses "a grounding grid corrosion rate detection method, by providing a swept-frequency voltage signal to the grounding grid, and detecting the swept-frequency current signal flowing out of the grounding grid, and calculating the swept-frequency impedance spectrum according to the swept-frequency voltage signal and the swept-frequency current signal. By recording the soil resistivity at the location of the grounding grid, and simulating the impedance spectrum of the grounding grid according to the structure of the grounding grid and the soil resistivity, a standard impedance spectrum is obtained. According to the swept-frequency impedance spectrum and the standard impedance spectrum, the corrosion degree and corrosion position of the conductor in the grounding grid are calculated, and further according to the corrosion degree and the detection time corresponding to the corrosion degree However, this method relies on the accurate recording of soil resistivity and precise grounding grid structure information to calculate the corrosion degree and position of the conductor in the grounding grid. However, the soil around the actual grounding grid is not completely uniform. The inhomogeneity of the soil will cause the standard impedance spectrum obtained by simulation to differ from the actual situation, which will affect the accuracy of the corrosion degree and position calculation. In addition, this method does not use an equivalent circuit to analyze the grounding grid. It relies on complex calculations and models and has high performance requirements for hardware equipment. If the equipment performance is insufficient, it will lead to the inability to quickly and accurately complete the detection of the swept frequency signal and the calculation of the impedance spectrum, affecting the detection efficiency and the reliability of the results. Summary of the invention

[0005] In order to solve the above-mentioned problems existing in the prior art, the present application provides a method and system for corrosion detection and remaining life assessment of a substation grounding grid.

[0006] The technical solution of this application is as follows:

[0007] On the one hand, the present invention provides a method for detecting corrosion and assessing the remaining life of a substation grounding grid, the method comprising:

[0008] Acquire the measurement points of the substation grounding grid and perform data cleaning; calibrate the electrochemical workstation using a standard impedance source to obtain a calibrated electrochemical workstation; use the calibrated electrochemical workstation to apply a sinusoidal AC signal to the substation grounding grid within a preset wide frequency range; select a preset number of frequency points, collect the impedance value of each measurement point at different frequency points, and calculate the average value of all impedance values ​​as the impedance value measurement result of the current measurement point;

[0009] Establishing a Randles equivalent circuit model of the measuring point, fitting the impedance value measurement result of the current measuring point and the impedance value calculation result of the Randles equivalent circuit model using the nonlinear least squares method to obtain the optimal fitting parameters; calculating the corrosion rate of the substation grounding grid according to the optimal fitting parameters;

[0010] The thickness of the current substation grounding grid is measured using non-destructive testing technology, and the remaining life of the substation grounding grid is obtained in combination with the corrosion rate.

[0011] Preferably, the method further comprises preselecting a working electrode, a reference electrode and an auxiliary electrode, connecting the working electrode and a measuring point, and arranging the reference electrode and the auxiliary electrode in the soil within a preset range of the substation grounding grid.

[0012] Preferably, a Randles equivalent circuit model of the measurement point is established, which is expressed as follows:

[0013]

[0014] Where Z represents the impedance value of the Randles equivalent circuit model; ω represents the angular frequency; R s Represents the solution resistance; R p Represents polarization resistance; C dl represents the double layer capacitance; σ represents the preset diffusion coefficient; j represents the imaginary unit.

[0015] Preferably, the impedance value measurement result of the current measurement point and the impedance value calculation result of the Randles equivalent circuit model are fitted using a nonlinear least squares method, specifically:

[0016] The Randles equivalent circuit model is divided into a real part and an imaginary part, which can be expressed as follows:

[0017]

[0018] In the formula, R represents the real part of the Randles equivalent circuit model; I represents the imaginary part of the Randles equivalent circuit model;

[0019] Construct the objective function and express it as follows:

[0020]

[0021] In the formula, S represents the objective function; Z c,i represents the impedance value calculation result of the Randles equivalent circuit model at the i-th measurement point; Z a,i Indicates the impedance value measurement result of the i-th measurement point; N indicates the number of measurement points; i indicates the index value of the i-th measurement point;

[0022] Initialize the fitting parameters θ = {R s ,R p ,C dl ,σ,ω}, construct the Jacobian matrix, which can be expressed as:

[0023]

[0024] Where, J represents the Jacobian matrix;

[0025] Update the fitting parameters to obtain the optimal fitting parameters, which can be expressed as:

[0026] θ n+1 =θ n -((J n ) T J n +λ n I) -1 (J n ) T r n ;

[0027] r n =Z c -Z a ;

[0028] |S n+1 -S n |<ε;

[0029] In the formula, θ n+1 represents the fitting parameters of the n+1th iteration; J n represents the Jacobian matrix of the nth iteration; T represents the transpose operation; λ n represents the damping factor of the nth iteration; r n represents the residual vector of the nth iteration; Z c Represents the impedance value calculation result of the Randles equivalent circuit model; Z a represents the measurement result of impedance value; I represents the unit matrix; S n+1 represents the objective function value of the n+1th iteration; ε represents the preset convergence threshold; n represents the index value of the nth iteration;

[0030] The fitting process is iterated until the maximum number of iterations is reached or the objective function value converges, then the iteration is stopped to obtain the optimal fitting parameters.

[0031] Preferably, the corrosion rate of the substation grounding grid is calculated and expressed as:

[0032]

[0033] Where V represents the corrosion rate; B represents the preset environmental constant; (R p ) * represents the optimal polarization resistance.

[0034] Preferably, the remaining life of the substation grounding grid is calculated in combination with the corrosion rate and is expressed as:

[0035]

[0036] In the formula, t represents the remaining life; h i represents the thickness of the substation grounding grid at the i-th measurement point; h 0 Indicates the initial thickness of the substation grounding grid; h m represents the thickness of the substation grounding grid at the time of the mth measurement; m represents the index value of the mth measurement; M represents the number of times the thickness of the substation grounding grid is measured; h min Indicates the minimum thickness of the substation grounding grid; t i represents the remaining life of the ith measurement point; T represents the remaining life of the substation grounding grid.

[0037] Preferably, the method further comprises monitoring the corrosion rate and remaining life of the substation grounding grid in real time, setting a corrosion rate threshold and a remaining life threshold; if the current corrosion rate is greater than the corrosion rate threshold or the current remaining life is greater than the remaining life threshold, an early warning signal is generated;

[0038] Obtain the corrosion rate and remaining life in the current cycle, fit the corrosion rate change curve and the remaining life change curve, and predict the corrosion rate and remaining life in the next cycle.

[0039] On the other hand, the present invention also proposes a substation grounding grid corrosion detection and remaining life assessment system, the system includes a data acquisition module, a fitting module, a remaining life calculation module and a result output module, wherein:

[0040] The data acquisition module is used to acquire the measurement points of the substation grounding grid and perform data cleaning; calibrate the electrochemical workstation using a standard impedance source to obtain a calibrated electrochemical workstation; use the calibrated electrochemical workstation to apply a sinusoidal AC signal to the substation grounding grid within a preset wide frequency range; select a preset number of frequency points, collect the impedance value of each measurement point at different frequency points, and calculate the average value of all impedance values ​​as the impedance value measurement result of the current measurement point; and transmit the measurement result to the fitting module;

[0041] The fitting module is used to establish a Randles equivalent circuit model of the measurement point, and use a nonlinear least squares method to fit the impedance value measurement result of the current measurement point and the impedance value calculation result of the Randles equivalent circuit model to obtain the optimal fitting parameters;

[0042] The remaining life calculation module is used to calculate the corrosion rate of the substation grounding grid according to the optimal fitting parameters; the thickness of the current substation grounding grid is measured by non-destructive testing technology, and the remaining life of the substation grounding grid is obtained in combination with the corrosion rate;

[0043] The result output module is used to display the remaining life of the substation grounding grid.

[0044] On the other hand, the present invention also proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a method for detecting corrosion and assessing the remaining life of a substation grounding grid is implemented as described in any embodiment of the present invention.

[0045] On the other hand, the present invention further proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for detecting corrosion and assessing the remaining life of a substation grounding grid as described in any embodiment of the present invention.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] 1) The present invention provides a method and system for detecting corrosion and assessing the remaining life of a substation grounding grid, which uses a standard impedance source to calibrate an electrochemical workstation, thereby improving the accuracy of impedance values ​​collected subsequently and reducing the impact of instrument errors on the detection results;

[0048] 2) The present invention provides a method and system for detecting corrosion and assessing the remaining life of a substation grounding grid. By establishing a Randles equivalent circuit model of the measuring point and fitting it using the nonlinear least squares method, the accuracy of corrosion rate calculation is improved, and the credibility and reliability of the detection results are improved;

[0049] 3) The present invention provides a method and system for detecting corrosion and assessing the remaining life of a substation grounding grid. The non-destructive testing technology is used to measure the thickness of the grounding grid, thereby avoiding additional damage to the grid body caused by the detection process. The accurate corrosion rate is combined with the actual thickness of the grounding grid to improve the scientific nature of the remaining life calculation, providing a reliable scientific basis for the maintenance plan formulation and equipment update decision-making of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a method flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0052] The present invention provides the following technical solution: a method and system for detecting corrosion and assessing the remaining life of a substation grounding grid.

[0053] Example 1

[0054] See Figure 1 This embodiment provides a method for detecting corrosion and assessing the remaining life of a substation grounding grid, and the specific steps include:

[0055] S1. Obtain the measurement points of the substation grounding grid and perform data cleaning;

[0056] In this embodiment, the number of measurement points for obtaining the substation grounding grid is 20;

[0057] S2. The method further comprises preselecting a working electrode, a reference electrode and an auxiliary electrode, connecting the working electrode and a measuring point, and arranging the reference electrode and the auxiliary electrode in the soil within a preset range of the substation grounding grid;

[0058] In this embodiment, a platinum electrode is selected as the working electrode, a saturated calomel electrode is selected as the reference electrode, and a platinum wire electrode is selected as the auxiliary electrode; the working electrode is tightly connected to the measuring point of the grounding grid through a special connection fixture, and the reference electrode and the auxiliary electrode are respectively inserted into the soil 0.5 meters and 1 meter away from the measuring point of the grounding grid;

[0059] S3. Apply a sinusoidal AC signal to the substation grounding grid within a preset wide frequency range using a calibrated electrochemical workstation; select a preset number of frequency points, collect the impedance value of each measurement point at different frequency points, and calculate the average value of all impedance values ​​as the impedance value measurement result of the current measurement point;

[0060] In this embodiment, the preset wide frequency range is 0.01 Hz-100 kHz; 50 frequency points are selected; the amplitude of the applied sinusoidal AC signal is 100 mV;

[0061] S4. Establish the Randles equivalent circuit model of the measurement point, expressed as follows:

[0062]

[0063] Where Z represents the impedance value of the Randles equivalent circuit model; ω represents the angular frequency; R s Represents the solution resistance; R p Represents polarization resistance; C dl represents the double layer capacitance; σ represents the preset diffusion coefficient; j represents the imaginary unit;

[0064] S5. Fit the impedance value measurement result of the current measurement point and the impedance value calculation result of the Randles equivalent circuit model using the nonlinear least squares method, specifically:

[0065] The Randles equivalent circuit model is divided into a real part and an imaginary part, which can be expressed as follows:

[0066]

[0067] In the formula, R represents the real part of the Randles equivalent circuit model; I represents the imaginary part of the Randles equivalent circuit model;

[0068] Construct the objective function and express it as follows:

[0069]

[0070] In the formula, S represents the objective function; Z c,i represents the impedance value calculation result of the Randles equivalent circuit model at the i-th measurement point; Z a,i Indicates the impedance value measurement result of the i-th measurement point; N indicates the number of measurement points; i indicates the index value of the i-th measurement point;

[0071] Initialize the fitting parameters θ = {R s ,R p ,C dl ,σ,ω}, construct the Jacobian matrix, which can be expressed as:

[0072]

[0073] Where, J represents the Jacobian matrix;

[0074] Update the fitting parameters to obtain the optimal fitting parameters, which can be expressed as:

[0075] θ n+1 =θ n -((J n ) T J n +λ n I) -1 (J n ) T r n ;

[0076] r n =Z c -Z a ;

[0077] |S n+1 -S n |<ε;

[0078] In the formula, θ n+1 represents the fitting parameters of the n+1th iteration; J n represents the Jacobian matrix of the nth iteration; T represents the transpose operation; λ nrepresents the damping factor of the nth iteration; r n represents the residual vector of the nth iteration; Z c Represents the impedance value calculation result of the Randles equivalent circuit model; Z a represents the measurement result of impedance value; I represents the unit matrix; S n+1 represents the objective function value of the n+1th iteration; ε represents the preset convergence threshold; n represents the index value of the nth iteration;

[0079] S6, iterating the fitting process until the maximum number of iterations is reached or the objective function value converges, then stopping the iteration to obtain the optimal fitting parameters;

[0080] S7. According to the optimal fitting parameters, the corrosion rate of the substation grounding grid is calculated, which is expressed as:

[0081]

[0082] Where V represents the corrosion rate; B represents the preset environmental constant; (R p ) * represents the optimal polarization resistance;

[0083] In this embodiment, the preset environmental constant is taken as 0.01;

[0084] S8. Use nondestructive testing technology to measure the thickness of the current substation grounding grid, and combine the corrosion rate to obtain the remaining life of the substation grounding grid, which is expressed as:

[0085]

[0086] In the formula, t represents the remaining life; h i represents the thickness of the substation grounding grid at the i-th measurement point; h 0 Indicates the initial thickness of the substation grounding grid; h m represents the thickness of the substation grounding grid at the time of the mth measurement; m represents the index value of the mth measurement; M represents the number of times the thickness of the substation grounding grid is measured; h min Indicates the minimum thickness of the substation grounding grid; t i represents the remaining life of the ith measurement point; T represents the remaining life of the substation grounding grid;

[0087] In this embodiment, the initial thickness of the substation grounding grid is 8 mm; the minimum thickness of the substation grounding grid is 3 mm;

[0088] S6. The method further includes monitoring the corrosion rate and remaining life of the substation grounding grid in real time, setting a corrosion rate threshold and a remaining life threshold; if the current corrosion rate is greater than the corrosion rate threshold or the current remaining life is greater than the remaining life threshold, an early warning signal is generated;

[0089] Obtain the corrosion rate and remaining life in the current cycle, fit the corrosion rate change curve and the remaining life change curve, and predict the corrosion rate and remaining life in the next cycle.

[0090] Example 2

[0091] This embodiment provides a system for detecting corrosion and assessing the remaining life of a substation grounding grid. The system includes a data acquisition module, a fitting module, a remaining life calculation module, and a result output module, wherein:

[0092] The data acquisition module is used to acquire the measurement points of the substation grounding grid and perform data cleaning; calibrate the electrochemical workstation using a standard impedance source to obtain a calibrated electrochemical workstation; use the calibrated electrochemical workstation to apply a sinusoidal AC signal to the substation grounding grid within a preset wide frequency range; select a preset number of frequency points, collect the impedance value of each measurement point at different frequency points, and calculate the average value of all impedance values ​​as the impedance value measurement result of the current measurement point; and transmit the measurement result to the fitting module;

[0093] The fitting module is used to establish a Randles equivalent circuit model of the measurement point, and use a nonlinear least squares method to fit the impedance value measurement result of the current measurement point and the impedance value calculation result of the Randles equivalent circuit model to obtain the optimal fitting parameters;

[0094] The remaining life calculation module is used to calculate the corrosion rate of the substation grounding grid according to the optimal fitting parameters; the thickness of the current substation grounding grid is measured by non-destructive testing technology, and the remaining life of the substation grounding grid is obtained in combination with the corrosion rate;

[0095] The result output module is used to display the remaining life of the substation grounding grid.

[0096] Example 3

[0097] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, a method for detecting corrosion and assessing the remaining life of a substation grounding grid is implemented as described in any embodiment of the present invention.

[0098] Example 4

[0099] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, a method for detecting corrosion and assessing the remaining life of a substation grounding grid as described in any embodiment of the present invention is implemented.

[0100] It is worth noting that the system, electronic device and computer-readable storage medium described in the present invention are based on the same principles as the method described in Example 1, and will not be described in detail here.

[0101] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for detecting corrosion and assessing the remaining life of a substation grounding grid, characterized in that: The method comprises: Acquire the measurement points of the substation grounding grid and perform data cleaning; calibrate the electrochemical workstation using a standard impedance source to obtain a calibrated electrochemical workstation; use the calibrated electrochemical workstation to apply a sinusoidal AC signal to the substation grounding grid within a preset wide frequency range; select a preset number of frequency points, collect the impedance value of each measurement point at different frequency points, and calculate the average value of all impedance values ​​as the impedance value measurement result of the current measurement point; Establishing a Randles equivalent circuit model of the measuring point, fitting the impedance value measurement result of the current measuring point and the impedance value calculation result of the Randles equivalent circuit model using the nonlinear least squares method to obtain the optimal fitting parameters; calculating the corrosion rate of the substation grounding grid according to the optimal fitting parameters; The thickness of the current substation grounding grid is measured using non-destructive testing technology, and the remaining life of the substation grounding grid is obtained in combination with the corrosion rate.

2. A method for detecting corrosion and assessing the remaining life of a substation grounding grid according to claim 1, characterized in that: The method further comprises preselecting a working electrode, a reference electrode and an auxiliary electrode, connecting the working electrode and a measuring point, and arranging the reference electrode and the auxiliary electrode in soil within a preset range of the substation grounding grid.

3. A method for detecting corrosion and assessing the remaining life of a substation grounding grid according to claim 1, characterized in that: The Randles equivalent circuit model of the measurement point is established and expressed as follows: Where Z represents the impedance value of the Randles equivalent circuit model; ω represents the angular frequency; R s Represents the solution resistance; R p Represents polarization resistance; C dl represents the double layer capacitance; σ represents the preset diffusion coefficient; j represents the imaginary unit.

4. A method for detecting corrosion and assessing the remaining life of a substation grounding grid according to claim 1, characterized in that: The impedance value measurement result of the current measurement point and the impedance value calculation result of the Randles equivalent circuit model are fitted using the nonlinear least squares method, specifically: The Randles equivalent circuit model is divided into a real part and an imaginary part, which can be expressed as follows: In the formula, R represents the real part of the Randles equivalent circuit model; I represents the imaginary part of the Randles equivalent circuit model; Construct the objective function and express it as follows: In the formula, S represents the objective function; Z c,i represents the impedance value calculation result of the Randles equivalent circuit model at the i-th measurement point; Z a,i Indicates the impedance value measurement result of the i-th measurement point; N indicates the number of measurement points; i indicates the index value of the i-th measurement point; Initialize the fitting parameters θ = {R s ,R p ,C dl ,σ,ω}, construct the Jacobian matrix, which can be expressed as: Where, J represents the Jacobian matrix; Update the fitting parameters to obtain the optimal fitting parameters, which can be expressed as: i n+1 =θ n -((J n ) T J n +λ n I) -1 (J n ) T r n ; r n =Z c -Z a ; |S n+1 -S n |<ε; In the formula, θ n+1 represents the fitting parameters of the n+1th iteration; J n represents the Jacobian matrix of the nth iteration; T represents the transpose operation; λ n represents the damping factor of the nth iteration; r n represents the residual vector of the nth iteration; Z c Represents the impedance value calculation result of the Randles equivalent circuit model; Z a represents the measurement result of impedance value; I represents the unit matrix; S n+1 represents the objective function value of the n+1th iteration; ε represents the preset convergence threshold; n represents the index value of the nth iteration; The fitting process is iterated until the maximum number of iterations is reached or the objective function value converges, then the iteration is stopped to obtain the optimal fitting parameters.

5. A method for detecting corrosion and assessing the remaining life of a substation grounding grid according to claim 1, characterized in that: The corrosion rate of the substation grounding grid is calculated using the formula: Where V represents the corrosion rate; B represents the preset environmental constant; (R p ) * represents the optimal polarization resistance.

6. A method for detecting corrosion and assessing the remaining life of a substation grounding grid according to claim 1, characterized in that: Combined with the corrosion rate, the remaining life of the substation grounding grid is calculated and expressed as: In the formula, t represents the remaining life; h i represents the thickness of the substation grounding grid at the i-th measurement point; h 0 Indicates the initial thickness of the substation grounding grid; h m represents the thickness of the substation grounding grid at the time of the mth measurement; m represents the index value of the mth measurement; M represents the number of times the thickness of the substation grounding grid is measured; h min Indicates the minimum thickness of the substation grounding grid; t i represents the remaining life of the i-th measurement point; T represents the remaining life of the substation grounding grid.

7. A method for detecting corrosion and assessing the remaining life of a substation grounding grid according to claim 1, characterized in that: The method further includes real-time monitoring of the corrosion rate and remaining life of the substation grounding grid, setting a corrosion rate threshold and a remaining life threshold; if the current corrosion rate is greater than the corrosion rate threshold or the current remaining life is greater than the remaining life threshold, an early warning signal is generated; Obtain the corrosion rate and remaining life in the current cycle, fit the corrosion rate change curve and the remaining life change curve, and predict the corrosion rate and remaining life in the next cycle.

8. A substation grounding grid corrosion detection and remaining life assessment system, characterized in that: The system includes a data acquisition module, a fitting module, a remaining life calculation module and a result output module, wherein: The data acquisition module is used to acquire the measurement points of the substation grounding grid and perform data cleaning; calibrate the electrochemical workstation using a standard impedance source to obtain a calibrated electrochemical workstation; use the calibrated electrochemical workstation to apply a sinusoidal AC signal to the substation grounding grid within a preset wide frequency range; select a preset number of frequency points, collect the impedance value of each measurement point at different frequency points, and calculate the average value of all impedance values ​​as the impedance value measurement result of the current measurement point; and transmit the measurement result to the fitting module; The fitting module is used to establish a Randles equivalent circuit model of the measurement point, and use a nonlinear least squares method to fit the impedance value measurement result of the current measurement point and the impedance value calculation result of the Randles equivalent circuit model to obtain the optimal fitting parameters; The remaining life calculation module is used to calculate the corrosion rate of the substation grounding grid according to the optimal fitting parameters; the thickness of the current substation grounding grid is measured by non-destructive testing technology, and the remaining life of the substation grounding grid is obtained in combination with the corrosion rate; The result output module is used to display the remaining life of the substation grounding grid.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, a method for detecting corrosion and assessing the remaining life of a substation grounding grid is implemented as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, a method for detecting corrosion and assessing the remaining life of a substation grounding grid is implemented as described in any one of claims 1 to 7.

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