Method and system for monitoring thermophysical property of deep well type grounding electrode and medium

Abstract

The invention discloses a deep well type grounding electrode thermophysical property monitoring method and system, and the method comprises the steps: configuring a corresponding scaling deep well type grounding electrode according to scaling deep well type grounding electrode parameters determined based on the actual physical parameters of a to-be-monitored deep well type grounding electrode; after a completion signal that the scaling deep well type grounding electrode is embedded into the grounding grid topology of the target substation is detected, generating a configuration strategy of a temperature measuring device matched with the scaling deep well type grounding electrode; after it is detected that the configuration strategy is executed, responding to a preset temperature measurement signal, and obtaining temperature change data output by the temperature measurement device; determining a monitoring result of the thermophysical property of the to-be-monitored deep well type grounding electrode based on a multi-modal analysis result of the temperature change data; generating a matched grounding electrode optimization strategy according to the monitoring result; according to the method, the thermophysical property of the deep well grounding electrode can be comprehensively known, and the operation safety of a transformer substation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power system grounding, and in particular to a method, system and medium for monitoring thermal properties of a deep well type grounding electrode. Background Art

[0002] Deep well grounding electrodes have outstanding advantages such as low construction cost and strong adaptability to terrain, which have gradually made them used in power systems. As an important part of the grounding system, the safe operation of deep well grounding electrodes is crucial to the stability of the entire power system.

[0003] However, at present, deep-well grounding electrodes often face the challenges of complex underground thermal properties and difficult-to-control temperature rise. In order to cope with these challenges, the existing technology installs temperature sensors on deep-well grounding electrodes for temperature monitoring. However, due to the complex environment in deep wells, the installation process of sensors is not only difficult, but may also interfere with the normal operation of the grounding electrode, resulting in large errors in the test results, and the inability to timely and accurately monitor the temperature of the grounding electrode, affecting the safety and stability of the power transmission equipment.

[0004] It can be seen that how to effectively monitor the thermal properties of deep well grounding electrodes has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The present invention provides a method, system and medium for monitoring the thermal properties of a deep well type grounding electrode, so as to overcome the technical difficulties faced in the thermal properties monitoring of the deep well type grounding electrode and improve the accuracy and reliability of monitoring.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a method for monitoring the thermal properties of a deep well type grounding electrode, comprising: According to the scaled-down deep-well type grounding electrode parameters determined based on the actual physical parameters of the deep-well type grounding electrode to be monitored, a corresponding scaled-down deep-well type grounding electrode is configured; After detecting a completion signal of the embedding of the scaled-down deep-well type grounding electrode into the grounding grid topology of the target substation, generating a configuration strategy of a temperature measuring device matching the scaled-down deep-well type grounding electrode; After detecting that the configuration strategy has been executed, in response to a predetermined temperature measurement signal, obtaining temperature change data output by the temperature measurement device; Determine the monitoring result of the thermal properties of the deep well type grounding electrode to be monitored based on the multimodal analysis result of the temperature change data; A matching grounding electrode optimization strategy is generated based on the monitoring results.

[0007] Furthermore, the configuration strategy includes: The parameters of the scaled-down deep-well type grounding electrode are intelligently analyzed to determine the distribution density of the temperature measuring points of the scaled-down deep-well type grounding electrode so as to configure the corresponding length and number of temperature measuring optical fibers.

[0008] Furthermore, the monitoring result of the thermal properties of the deep well type grounding electrode to be monitored is determined based on the multimodal analysis result of the temperature change data, including: Analyze the temperature change data based on the time scale and construct a linear fitting model of temperature rise and fall mode; The temperature rise and fall modal linear fitting model is solved by using an optimization algorithm to obtain the modal coefficients of the temperature rise process and the modal coefficients of the temperature drop process; According to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process, a monitoring result of the deep well type grounding electrode to be monitored is obtained.

[0009] Furthermore, the process of constructing the temperature rise and fall modal linear fitting model includes: At the first flow test time, a temperature rise modal linear fitting model is constructed, which is expressed by the following formula: in, For time, , , , , , is the modal coefficient of the temperature rise process, is the temperature of the point to be measured at time t; At the second flow test time, a linear fitting model of the temperature drop mode is constructed, which is expressed by the following formula: in, , , , , , is the modal coefficient of the temperature drop process.

[0010] Further, obtaining the monitoring result according to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process includes: Analyze the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process to determine the temperature rise influence index and the temperature drop influence index of the scaled-down deep well type grounding electrode; Inputting the temperature rise influence index and the temperature drop influence index into the constructed grounding electrode temperature field distribution model to obtain the temperature distribution of the temperature field of the scaled-down deep well type grounding electrode; The key parameters are extracted from the temperature distribution, and the thermal physical parameters of the deep well type grounding electrode to be monitored are calculated and analyzed to obtain the monitoring result.

[0011] Furthermore, the process of constructing the grounding electrode temperature field distribution model includes: In response to the temperature measurement signal, the distribution of the test current is monitored to obtain the current density and current field data of the scaled-down deep-well type grounding electrode; In the process of training the grounding electrode temperature field distribution model according to the current density and the current field data, a temperature correction factor is introduced to obtain the trained grounding electrode temperature field distribution model.

[0012] Further, the obtaining of the monitoring result according to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process also includes: According to the temperature distribution, the scaled-down deep-well type grounding electrode is spatially divided, and according to the division result, the target temperature rise and temperature drop areas of the deep-well type grounding electrode to be monitored are determined; When it is determined that the temperature in the target temperature rise and temperature drop area exceeds the set safety temperature threshold, an alarm is triggered.

[0013] Another embodiment of the present invention provides a monitoring system for thermal properties of a deep well grounding electrode, the system comprising: A parameter configuration module, used to configure a corresponding scaled-down deep-well type grounding electrode based on scaled-down deep-well type grounding electrode parameters determined based on actual physical parameters of the deep-well type grounding electrode to be monitored; A temperature measuring device configuration module, for generating a configuration strategy of a temperature measuring device matching the scaled-down deep-well type grounding electrode after detecting a completion signal of the scaled-down deep-well type grounding electrode being embedded in the grounding grid topology of the target substation; A temperature monitoring module, configured to obtain temperature change data output by the temperature measuring device in response to a predetermined temperature measurement signal after detecting that the configuration strategy has been executed; The modal analysis module is used to determine the monitoring results of the thermal properties of the deep well type grounding electrode to be monitored based on the multi-modal analysis results of the temperature change data.

[0014] Furthermore, the temperature measuring device configuration module is specifically used to: The parameters of the scaled-down deep-well type grounding electrode are intelligently analyzed to determine the distribution density of the temperature measuring points of the scaled-down deep-well type grounding electrode so as to configure the corresponding length and number of temperature measuring optical fibers.

[0015] Furthermore, the modal analysis module is specifically used for: Analyze the temperature change data based on the time scale and construct a linear fitting model of temperature rise and fall mode; The temperature rise and fall modal linear fitting model is solved by using an optimization algorithm to obtain the modal coefficients of the temperature rise process and the modal coefficients of the temperature drop process; According to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process, a monitoring result of the deep well type grounding electrode to be monitored is obtained.

[0016] Furthermore, the process of constructing the temperature rise and fall modal linear fitting model includes: At the first flow test time, a temperature rise modal linear fitting model is constructed, which is expressed by the following formula: in, For time, , , , , , is the modal coefficient of the temperature rise process, is the temperature of the test point at time t; At the second flow test time, a linear fitting model of the temperature drop mode is constructed, which is expressed by the following formula: in, , , , , , is the modal coefficient of the temperature drop process.

[0017] Further, obtaining the monitoring result according to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process includes: Analyze the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process to determine the temperature rise influence index and the temperature drop influence index of the scaled-down deep well type grounding electrode; Inputting the temperature rise influence index and the temperature drop influence index into the constructed grounding electrode temperature field distribution model to obtain the temperature distribution of the temperature field of the scaled-down deep well type grounding electrode; The key parameters are extracted from the temperature distribution, and the thermal physical parameters of the deep well type grounding electrode to be monitored are calculated and analyzed to obtain the monitoring result.

[0018] Furthermore, the process of constructing the grounding electrode temperature field distribution model includes: In response to the temperature measurement signal, the distribution of the test current is monitored to obtain the current density and current field data of the scaled-down deep-well type grounding electrode; In the process of training the grounding electrode temperature field distribution model according to the current density and the current field data, a temperature correction factor is introduced to obtain the trained grounding electrode temperature field distribution model.

[0019] Yet another embodiment of the present invention provides a computer-readable storage medium storing a computer program, wherein when the device where the computer-readable storage medium is located executes the computer program, the method for monitoring thermal properties of a deep well grounding electrode as described above is implemented.

[0020] Compared with the prior art, the embodiments of the present invention have the following advantages: The embodiment of the present invention can simulate the operating environment of an actual deep well grounding electrode by establishing a scaled-down deep well grounding electrode and configuring an optical fiber temperature measurement system, and adjust the scale ratio and test current according to actual needs, so as to more accurately test its thermal properties; through in-depth analysis of the main mode, secondary mode and linear mode in the temperature data, a comprehensive multi-modal study of the thermal properties of the deep well grounding electrode can be carried out, which helps to discover potential thermal problems of the deep well grounding electrode, provide strong support for the safe operation of the deep well grounding electrode, and improve the stability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic flow chart of a method for monitoring thermal properties of a deep well type grounding electrode in one embodiment of the present invention; Figure 2 It is a schematic diagram of the temperature measuring optical fiber structure of a scaled-down deep-well type grounding electrode in one embodiment of the present invention; Figure 3 is a schematic diagram of different mode decompositions in one embodiment of the present invention; Figure 4 It is a schematic diagram of the solution effect of the actual measurement formula of the temperature rise at the temperature measuring point in one embodiment of the present invention; Figure 5 It is a waveform diagram of the temperature rise mode of the temperature measuring point in one embodiment of the present invention; Figure 6 It is a schematic diagram of the solution effect of the actual measurement formula of the temperature drop at the temperature measuring point in one embodiment of the present invention; Figure 7 It is a waveform diagram of the temperature drop mode of the temperature measuring point in one embodiment of the present invention; Figure 8 It is a schematic diagram of the structure of a monitoring system for thermal properties of a deep well type grounding electrode in one embodiment of the present invention; Fig. 9 It is a schematic structural diagram of a deep well type grounding electrode thermal property monitoring device in one embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of this application, the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0024] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are only for illustrative purposes, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0026] It is understandable that the safe operation of the deep well grounding electrode, as an important part of the grounding system, is crucial to the stability of the entire power system. Thermophysical parameters (such as thermal conductivity, specific heat capacity, etc.) are key factors affecting the heat dissipation performance and temperature distribution of the grounding electrode. By testing the thermal properties of the deep well grounding electrode, its heat dissipation performance and temperature changes can be understood, thereby ensuring that the grounding electrode operates within a safe temperature range. Based on this, an embodiment of the present invention provides a method for monitoring the thermal properties of a deep well grounding electrode. For details, please refer to Figure 1 , Figure 1 In one embodiment of the present invention, the following steps are included: S1. Configure the corresponding scaled-down deep-well type grounding electrode according to the scaled-down deep-well type grounding electrode parameters determined based on the actual physical parameters of the deep-well type grounding electrode to be monitored.

[0027] It can be understood that the scaled-down deep-well grounding electrode can simulate the behavior of the real grounding electrode, thereby greatly reducing the cost of testing. Based on this, in order to construct an accurate and reliable scaled-down deep-well grounding electrode, the embodiment of the present invention will determine the actual physical parameters of the deep-well grounding electrode to be monitored according to the actual deep-well grounding electrode project in the target area, including: size, depth, material, resistivity, current, etc.

[0028] On the basis of these actual parameters, the parameters of the scaled-down deep well type grounding electrode are calculated according to the determined scaled-down ratio. In some embodiments of the present invention, laboratory conditions can be selected, and the test requirements for verifying the thermal properties of the grounding electrode can be clearly determined. In this process, historical data of similar tests in the past can be referred to understand the impact of the scaled-down ratio on the test results, and the scaled-down ratio can be determined based on the geometric similarity and electrical similarity between the actual deep well grounding electrode and the scaled-down deep well type grounding electrode.

[0029] As an example, in some embodiments of the present invention, the parameters of the scaled-down deep well type grounding electrode are determined with reference to the deep well depth, deep well radius and injection current parameters of the actual deep well type grounding electrode. Please refer to Table 1 for details: Table 1 Test parameters obtained by referring to actual deep well grounding electrode parameters It can be seen that the determined test parameters of the scaled-down deep-well grounding electrode reflect the geometric and electrical characteristics of the actual deep-well grounding electrode. Based on this, the scaled-down deep-well grounding electrode is configured to ensure that the scaled-down grounding electrode can accurately simulate and reflect the performance of the actual grounding electrode to be monitored.

[0030] S2. After detecting a completion signal of embedding the scaled-down deep-well type grounding electrode into the grounding grid topology of the target substation, a configuration strategy of a temperature measuring device matching the scaled-down deep-well type grounding electrode is generated.

[0031] After completing the construction of the scaled-down deep-well type grounding electrode, in order to simulate the grounding system under actual working conditions, the embodiment of the present invention safely connects the scaled-down deep-well type grounding electrode to the grounding grid of the substation through suitable cables and test power supply equipment. This embodiment can complete the test wiring of the temperature rise and temperature drop of the scaled-down deep-well type grounding electrode according to the substation grounding grid project near the actual grounding electrode to ensure that the electrical connection is reliable. It can be understood that during the thermal property test of the grounding electrode, a certain current needs to be passed through the grounding electrode to observe its temperature changes and then analyze its thermal properties. The configured test power supply can provide a stable and controllable current output for the scaled-down deep-well type grounding electrode to meet the test requirements.

[0032] Select a high-precision temperature measuring device suitable for high-temperature environments, determine the distribution density of the temperature measuring points of the scaled-down deep-well grounding electrode by intelligently analyzing the parameters of the scaled-down deep-well grounding electrode, and arrange the corresponding length and number of temperature measuring optical fibers at the key positions of the scaled-down deep-well grounding electrode.

[0033] As an example, in some embodiments of the present invention, the temperature measuring optical fiber is laid along the length direction of the scaled-down deep well type grounding electrode to ensure good contact between the optical fiber and the grounding electrode. At every 5 cm position, a special fixing piece is used to fix the optical fiber on the grounding electrode to form a temperature measuring point. For details, please refer to Figure 2 , Figure 2 Shown is a schematic diagram of the temperature measuring optical fiber structure of a scaled-down deep-well type grounding electrode in one embodiment of the present invention.

[0034] S3. After detecting that the configuration strategy has been executed, in response to a predetermined temperature measurement signal, obtaining temperature change data output by the temperature measurement device.

[0035] After the temperature measuring device is configured, in response to a predetermined temperature measurement signal, supported by the test current value determined by the scaled-down deep-well type grounding electrode parameters, a corresponding test current is injected into the scaled-down deep-well type grounding electrode to perform temperature rise and drop tests on the scaled-down deep-well type grounding electrode for a specific period of time.

[0036] As an example, in some embodiments of the present invention, a temperature rise / fall test is performed with a test current for no less than 12 hours. For example, during the temperature rise process, if the temperature of any temperature measuring point of the temperature measuring optical fiber exceeds 90°C (363.15K) during the test, the current is stopped, and the temperature measuring optical fiber will record the temperature change curves of all temperature measuring points in the whole process. This step can simulate the thermal behavior of a real grounding electrode under the action of current through the above operation, thereby obtaining key temperature change data for subsequent modal analysis.

[0037] S4. Determine the monitoring result of the thermal properties of the deep well type grounding electrode to be monitored based on the multimodal analysis result of the temperature change data.

[0038] The embodiment of the present invention analyzes the temperature change data based on the time scale and applies fitting formulas such as linear regression and exponential decay to describe the temperature rise and fall process. That is, by constructing a mathematical model for linear fitting of temperature rise and fall modes, a multi-modal analysis of the thermal properties of deep well grounding electrodes is achieved.

[0039] It can be understood that the current-through test time refers to the length of time during which a specified current value is applied to a device or component under specific test conditions and the duration of the current is used to observe changes in its performance. Based on this, the embodiment of the present invention constructs a temperature rise modal linear fitting model under the set first current-through test time.

[0040] In this embodiment, one of the temperature measurement points is selected and named , For the number ( = 1, 2, ..., n, where n is the number of all temperature measurement points). Taking the flow test time as zero moment (t = 0), the modal fitting formula of the temperature rise process is expressed as follows: in, For time, , , , , , is the modal coefficient of the temperature rise process, is the temperature of the monitored temperature measuring point at time t.

[0041] For the description of the modal coefficients during the temperature rise process, please refer to the following Table 2: Table 2 About A x , B x , C x , D x 、E x 、F x Description It can be seen that the embodiment of the present invention takes into account the change of the temperature of the temperature measurement point over time and chooses to simulate the primary / secondary mode through a function, that is, , These two reflect different exponential function terms of attenuation modes. In addition to attenuation modes, there may be other types of temperature changes, such as linear growth or decline. Therefore, the linear term is added to the formula To represent this possible linear change.

[0042] For the above multi-modal decomposition process, please refer to Figure 3 As shown, Figure 3FIG. 1 is a schematic diagram of different mode decompositions in one embodiment of the present invention. Figure 3 It can be seen that different modal analyses of the collected temperature data will present different linear change characteristics.

[0043] Then, similarly, the embodiment of the present invention constructs a linear fitting model of the temperature drop mode under the set second current flow test time. Let the time when the power supply current flow test is stopped be the zero time (t = 0), then the modal fitting formula of the temperature drop process is expressed as follows: in, , , , , , is the modal coefficient of the temperature drop process.

[0044] Furthermore, in order to determine the values ​​of the temperature rise modal coefficient and the temperature drop modal coefficient, thereby obtaining the thermal properties of the grounding electrode reflected by the thermal property test results, the embodiment of the present invention uses an optimization algorithm to solve the temperature rise and fall modal linear fitting model.

[0045] As an example, in some embodiments of the present invention, two groups of modal linear fitting models are solved by the least square method to obtain the modal coefficients of the temperature rise process and the modal coefficients of the temperature drop process.

[0046] Specifically, taking the actual test data of a temperature rise process as an example, the results obtained by using the optimization algorithm to solve the modal fitting formula of the temperature rise process are expressed as follows: For specific solutions, please refer to Figure 4 , Figure 4 FIG. 1 is a schematic diagram showing the effect of solving the temperature rise measurement formula of the temperature measuring point in one embodiment of the present invention. For the specific temperature rise modal waveform, please refer to FIG. Figure 5 shown.

[0047] Similarly, taking the actual test data of a temperature drop process as an example, the results obtained by using the optimization algorithm to solve the modal fitting formula of the temperature drop process are expressed as follows: For specific solutions, please refer to Figure 6 , Figure 6 FIG. 1 is a schematic diagram showing the effect of solving the temperature rise measurement formula of the temperature measuring point in one embodiment of the present invention. For the specific temperature rise modal waveform, please refer to FIG. Figure 7 shown.

[0048] According to the modal coefficients and modal decomposition diagram obtained by solving, the embodiment of the present invention obtains the evaluation and analysis test results of the thermal properties of the deep well grounding electrode by combining the results obtained by solving the above fitting formula. Specifically, please refer to the following Table 3: Table 3 Analysis of thermal properties of deep well grounding electrodes

[0049] It can be seen that these modal coefficients fully reflect the thermal properties of the grounding electrode during the temperature rise and temperature drop process, such as key parameters such as the thermal diffusivity of the soil, the soil temperature time, etc. The embodiment of the present invention compares and analyzes the modal coefficients of the temperature rise process with the main mode, secondary mode and linear mode of the temperature drop process, which helps to more comprehensively understand the thermal response behavior of the soil under current injection.

[0050] In some embodiments of the present invention, an example of temperature rise analysis of a deep well type grounding electrode within 48 hours is given. Specifically, the present invention combines the modal fitting formula of the temperature rise process, when the actual injection current of the deep well type grounding electrode is When , the temperature rise modal fitting formula within 48h is expressed as follows: in, Represents a constant related to the thermal properties of soil.

[0051] Understandably, due to the longer test time, the linear growth part of the temperature rise will become more significant, because the heat accumulation effect inside the equipment will be more obvious under long-term operation. At the same time, other factors may also be considered in the formula, such as , which represents the relationship between electric current and soil thermophysical properties, indicates that the temperature rise increases at a faster rate as the ratio of injected current to thermal diffusivity increases.

[0052] By constructing the above two formulas, the relationship between the modal coefficient and thermal physical parameters such as soil thermal diffusivity and soil temperature time constant is deeply studied, and the temperature rise influence index and temperature drop influence index of the scaled-down deep well type grounding electrode are further determined. As an example, the temperature rise influence index includes but is not limited to the temperature rise peak value, temperature rise rate and temperature rise distribution uniformity, while the temperature drop influence index includes but is not limited to the temperature drop amplitude, temperature drop rate, temperature recovery time and temperature drop stability.

[0053] The temperature rise influence index and the temperature drop influence index are input into the constructed grounding electrode temperature field distribution model to obtain the temperature distribution of the temperature field of the scaled-down deep well grounding electrode. In some embodiments of the present invention, the temperature distribution includes the direction information of the temperature field and the spatial distribution information of heat dissipation.

[0054] Specifically, regarding the construction of the grounding electrode temperature field distribution model, in some embodiments of the present invention, exemplarily, a numerical method such as finite element analysis, finite difference method or thermal network method is selected to construct the grounding electrode temperature field distribution model.

[0055] In response to the temperature measurement signal, it is first necessary to use high-precision current measurement equipment to monitor the distribution of the test current, obtain the current density and current field data of the deep well grounding electrode, and perform preprocessing operations such as data cleaning and outlier removal.

[0056] In the process of training the grounding electrode temperature field distribution model according to the current density and the current field data, a temperature correction factor is introduced to obtain the trained grounding electrode temperature field distribution model.

[0057] It can be understood that the embodiment of the present invention designs a temperature correction factor to correct the temperature prediction value in the model to more accurately reflect the actual temperature distribution. In this process, the set correction factor needs to be quantified and analyzed, and the quantified correction factor is integrated into the grounding electrode temperature field distribution model. In the model training process, the correction factor is used as one of the input variables and used together with the current density and current field data to train the model.

[0058] In the model prediction process, according to the actual current distribution and soil parameters, the value of the correction factor is adjusted to obtain a more accurate temperature prediction result.

[0059] Key parameters are extracted from the temperature distribution output by the grounding electrode temperature field distribution model, and the thermal physical property parameters of the deep well grounding electrode to be monitored are calculated and analyzed to achieve thermal physical property monitoring of the deep well grounding electrode and obtain monitoring results.

[0060] Specifically, the embodiment of the present invention extracts key temperature parameters from the temperature distribution, and the key parameters include the maximum temperature, the minimum temperature, the average temperature, the temperature gradient, etc. These parameters can reflect the thermal state of the deep well grounding electrode at different times and different locations. Using the extracted temperature parameters and other known conditions, such as current, resistance, time, combined with thermal principles such as heat conduction, heat convection and thermal radiation, the values ​​of the thermal physical parameters of the deep well grounding electrode are calculated. It can be understood that the thermal physical parameters include thermal conductivity, thermal diffusivity, heat capacity, etc.

[0061] In some embodiments of the present invention, a temperature warning operation is also provided based on the temperature distribution. Specifically, the scaled-down deep-well type grounding electrode is spatially divided according to the temperature distribution to determine the target temperature rise and temperature drop area of ​​the deep-well type grounding electrode to be monitored, that is, the maximum temperature rise and maximum temperature drop area. After determining the maximum temperature rise and temperature drop area, it is determined whether the monitored temperature in this area exceeds the set safety temperature threshold, and an alarm is triggered accordingly.

[0062] It can be understood that in some embodiments of the present invention, after the monitoring results are obtained, a matching grounding electrode optimization strategy will be generated based on the monitoring results.

[0063] By analyzing, evaluating and calculating the thermal properties of the grounding electrode, after completing the test, the embodiment of the present invention formulates a targeted grounding electrode optimization strategy based on the data generated during the test process. The grounding electrode optimization strategy includes at least a soil optimization strategy, a resistance optimization strategy and a grounding electrode material optimization strategy, which involve aspects such as grounding electrode material and structure design, soil treatment, installation and maintenance. Exemplarily, a material with higher thermal conductivity and lower thermal resistance is selected as the manufacturing material of the grounding electrode, or the shape and size of the grounding electrode are optimized to improve its heat dissipation performance. In order to solve the problem of poor soil conductivity or excessive resistivity, the method of adding conductive materials or improving the soil structure can be adopted to enhance the conductivity of the soil.

[0064] In summary, the embodiment of the present invention constructs a scaled-down deep-well grounding electrode through the geometric and electrical characteristics of the actual deep-well grounding electrode, which not only reduces the testing cost but also improves the flexibility and accuracy of the test; based on the designed scaled-down deep-well grounding electrode, a temperature rise / drop test of multi-modal analysis is performed through the configured temperature measurement system, and the temperature changes of the scaled-down deep-well grounding electrode during the test are accurately monitored, which can more comprehensively understand the thermal physical properties of the deep-well grounding electrode, thereby realizing targeted optimization and maintenance of the grounding electrode and improving the operating safety of the substation.

[0065] Another embodiment of the present invention provides a monitoring system for the thermal properties of a deep well type grounding electrode. For details, see Figure 8 , Figure 8 The figure shows a schematic diagram of the structure of a monitoring system for thermal properties of a deep well type grounding electrode in one embodiment of the present invention, the system comprising: The parameter configuration module M1 is used to configure the corresponding scaled-down deep-well type grounding electrode according to the scaled-down deep-well type grounding electrode parameters determined based on the actual physical parameters of the deep-well type grounding electrode to be monitored; The temperature measuring device configuration module M2 is used to generate a configuration strategy of the temperature measuring device matching the scaled-down deep-well type grounding electrode after detecting a completion signal of the scaled-down deep-well type grounding electrode being embedded in the grounding grid topology of the target substation; The temperature monitoring module M3 is used to obtain the temperature change data output by the temperature measuring device in response to a predetermined temperature measurement signal after detecting that the configuration strategy has been executed; The modal analysis module M4 is used to determine the monitoring result of the thermal properties of the deep well type grounding electrode to be monitored based on the multi-modal analysis result of the temperature change data.

[0066] As an example, this embodiment uses the temperature measuring device configuration module to perform intelligent analysis on the scaled-down deep-well type grounding electrode parameters, determine the temperature measuring point distribution density of the scaled-down deep-well type grounding electrode, and configure temperature measuring optical fibers of corresponding length and quantity.

[0067] As an example, this embodiment performs multimodal analysis on the temperature change data through the modal analysis module, specifically: Analyze the temperature change data based on the time scale and construct a linear fitting model of temperature rise and fall mode; The temperature rise and fall modal linear fitting model is solved by using an optimization algorithm to obtain the modal coefficients of the temperature rise process and the modal coefficients of the temperature drop process; According to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process, a monitoring result of the deep well type grounding electrode to be monitored is obtained.

[0068] Specifically, the process of constructing the temperature rise and fall modal linear fitting model includes: At the first flow test time, a temperature rise modal linear fitting model is constructed, which is expressed by the following formula: in, For time, , , , , , is the modal coefficient of the temperature rise process, is the temperature of the test point at time t; At the second flow test time, a linear fitting model of the temperature drop mode is constructed, which is expressed by the following formula: in, , , , , , is the modal coefficient of the temperature drop process.

[0069] In the embodiment of the present invention, the process of obtaining the monitoring result according to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process specifically includes: Analyze the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process to determine the temperature rise influence index and the temperature drop influence index of the scaled-down deep well type grounding electrode; Inputting the temperature rise influence index and the temperature drop influence index into the constructed grounding electrode temperature field distribution model to obtain the temperature distribution of the temperature field of the scaled-down deep well type grounding electrode; The key parameters are extracted from the temperature distribution, and the thermal physical parameters of the deep well type grounding electrode to be monitored are calculated and analyzed to obtain the monitoring result.

[0070] As an example, the process of constructing the grounding electrode temperature field distribution model specifically includes: In response to the temperature measurement signal, the distribution of the test current is monitored to obtain the current density and current field data of the scaled-down deep-well type grounding electrode; In the process of training the grounding electrode temperature field distribution model according to the current density and the current field data, a temperature correction factor is introduced to obtain the trained grounding electrode temperature field distribution model.

[0071] In another embodiment of the present invention, a deep well type grounding electrode thermal property monitoring device is also provided. For details, see Fig. 9 shown.

[0072] It can be understood that the device is connected to the monitoring system of the thermal properties of the deep-well type grounding electrode, including a scaled-down deep-well type grounding electrode, a temperature measurement system, a grounding grid and a test power supply.

[0073] like Fig. 9 As shown, the scaled-down deep-well type grounding electrode is connected to the test power supply and the substation grounding grid via a cable, and the test power supply is used to provide current support to the scaled-down deep-well type grounding electrode. An example provided by the present invention is: a thermal property monitoring process of a grounding electrode simulating a 35m deep-well structure. Figure 8 It can be seen that the scaled-down deep-well grounding electrode constructed is supported by a steel pipe and filled with coke.

[0074] The temperature measurement system is arranged on the scaled-down deep well type grounding electrode, and is used for real-time monitoring and collecting temperature data and sending it to the monitoring system. The system processes the received temperature data and feeds back the generated processing results to the monitoring system in real time so that relevant personnel can conduct real-time monitoring.

[0075] It can be understood that the temperature measurement system in this embodiment also includes a distributed temperature measurement optical fiber, a temperature calibration device and a data acquisition device; Figure 2 It can be seen that the distributed temperature measurement optical fiber is set on one side of the steel pipe.

[0076] Among them, the distributed temperature measurement optical fiber collects the temperature data generated by the scaled-down deep well type grounding electrode during the temperature rise and drop process in real time, and sends it to the temperature calibration equipment for correction, and the data acquisition equipment converts the received correction data into electrical signals and sends it to the monitoring system for analysis.

[0077] In some other embodiments of the present invention, the device further includes an early warning module. When the detected temperature data exceeds a preset safety temperature threshold, the monitoring system will send an early warning signal to the early warning module to trigger an alarm.

[0078] Accordingly, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the steps in the method for monitoring the thermal properties of a deep well type grounding electrode in the above embodiment, for example Figure 1 The above-described embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for monitoring the thermal properties of a deep well grounding electrode, characterized in that: include: According to the scaled-down deep-well type grounding electrode parameters determined based on the actual physical parameters of the deep-well type grounding electrode to be monitored, a corresponding scaled-down deep-well type grounding electrode is configured; After detecting a completion signal of the embedding of the scaled-down deep-well type grounding electrode into the grounding grid topology of the target substation, generating a configuration strategy of a temperature measuring device matching the scaled-down deep-well type grounding electrode; After detecting that the configuration strategy has been executed, in response to a predetermined temperature measurement signal, obtaining temperature change data output by the temperature measurement device; Based on the multimodal analysis result of the temperature change data, the monitoring result of the thermal properties of the deep well type grounding electrode to be monitored is determined.

2. The method for monitoring thermal properties of a deep well grounding electrode according to claim 1, characterized in that: The configuration strategy includes: The parameters of the scaled-down deep-well type grounding electrode are intelligently analyzed to determine the distribution density of the temperature measuring points of the scaled-down deep-well type grounding electrode so as to configure the corresponding length and number of temperature measuring optical fibers.

3. The method for monitoring thermal properties of a deep well grounding electrode according to claim 1, characterized in that: The monitoring result of the thermal properties of the deep well type grounding electrode to be monitored is determined based on the multimodal analysis result of the temperature change data, including: Analyze the temperature change data based on the time scale and construct a linear fitting model of temperature rise and fall mode; The temperature rise and fall modal linear fitting model is solved by using an optimization algorithm to obtain the modal coefficients of the temperature rise process and the modal coefficients of the temperature drop process; According to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process, a monitoring result of the deep well type grounding electrode to be monitored is obtained.

4. The method for monitoring thermal properties of a deep well grounding electrode according to claim 3, characterized in that: The process of constructing the temperature rise and fall modal linear fitting model includes: At the first flow test time, a temperature rise modal linear fitting model is constructed, which is expressed by the following formula: in, For time, , , , , , is the modal coefficient of the temperature rise process, is the temperature of the test point at time t; At the second flow test time, a temperature drop modal linear fitting model is constructed, which is expressed by the following formula: in, , , , , , is the modal coefficient of the temperature drop process.

5. The method for monitoring thermal properties of a deep well grounding electrode according to claim 3, characterized in that: The obtaining the monitoring result according to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process includes: Analyze the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process to determine the temperature rise influence index and the temperature drop influence index of the scaled-down deep well type grounding electrode; Inputting the temperature rise influence index and the temperature drop influence index into the constructed grounding electrode temperature field distribution model to obtain the temperature distribution of the temperature field of the scaled-down deep well type grounding electrode; The key parameters are extracted from the temperature distribution, and the thermal physical parameters of the deep well type grounding electrode to be monitored are calculated and analyzed to obtain the monitoring result.

6. The method for monitoring thermal properties of a deep well grounding electrode according to claim 5, characterized in that: The construction process of the grounding electrode temperature field distribution model includes: In response to the temperature measurement signal, the distribution of the test current is monitored to obtain the current density and current field data of the scaled-down deep-well type grounding electrode; In the process of training the grounding electrode temperature field distribution model according to the current density and the current field data, a temperature correction factor is introduced to obtain the trained grounding electrode temperature field distribution model.

7. The method for monitoring thermal properties of a deep well grounding electrode according to claim 5, characterized in that: The step of obtaining the monitoring result according to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process further includes: According to the temperature distribution, the scaled-down deep-well type grounding electrode is spatially divided, and according to the division result, the target temperature rise and temperature drop area of ​​the deep-well type grounding electrode to be monitored is determined; When it is determined that the temperature in the target temperature rise and temperature drop area exceeds the set safety temperature threshold, an alarm is triggered.

8. A deep well type grounding electrode thermal property monitoring system, characterized in that: The system comprises: A parameter configuration module, used to configure a corresponding scaled-down deep-well type grounding electrode based on scaled-down deep-well type grounding electrode parameters determined based on actual physical parameters of the deep-well type grounding electrode to be monitored; A temperature measuring device configuration module, for generating a configuration strategy of a temperature measuring device matching the scaled-down deep-well type grounding electrode after detecting a completion signal of the scaled-down deep-well type grounding electrode being embedded in the grounding grid topology of the target substation; A temperature monitoring module, configured to obtain temperature change data output by the temperature measuring device in response to a predetermined temperature measurement signal after detecting that the configuration strategy has been executed; The modal analysis module is used to determine the monitoring results of the thermal properties of the deep well type grounding electrode to be monitored based on the multi-modal analysis results of the temperature change data.

9. The deep well type grounding electrode thermal property monitoring system as claimed in claim 8, characterized in that: The temperature measuring device configuration module is specifically used for: The parameters of the scaled-down deep-well type grounding electrode are intelligently analyzed to determine the distribution density of the temperature measuring points of the scaled-down deep-well type grounding electrode so as to configure the corresponding length and number of temperature measuring optical fibers.

10. The deep well type grounding electrode thermal property monitoring system according to claim 8, characterized in that: The modal analysis module is specifically used for: Analyze the temperature change data based on the time scale and construct a linear fitting model of temperature rise and fall mode; The temperature rise and fall modal linear fitting model is solved by using an optimization algorithm to obtain the modal coefficients of the temperature rise process and the modal coefficients of the temperature drop process; According to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process, a monitoring result of the deep well type grounding electrode to be monitored is obtained.

11. The deep well type grounding electrode thermal property monitoring system according to claim 10, characterized in that: The process of constructing the temperature rise and fall modal linear fitting model includes: At the first flow test time, a temperature rise modal linear fitting model is constructed, which is expressed by the following formula: in, For time, , , , , , is the modal coefficient of the temperature rise process, is the temperature of the test point at time t; At the second flow test time, a linear fitting model of the temperature drop mode is constructed, which is expressed by the following formula: in, , , , , , is the modal coefficient of the temperature drop process.

12. The deep well type grounding electrode thermal property monitoring system according to claim 10, characterized in that: The obtaining the monitoring result according to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process includes: Analyze the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process to determine the temperature rise influence index and the temperature drop influence index of the scaled-down deep well type grounding electrode; Inputting the temperature rise influence index and the temperature drop influence index into the constructed grounding electrode temperature field distribution model to obtain the temperature distribution of the temperature field of the scaled-down deep well type grounding electrode; The key parameters are extracted from the temperature distribution, and the thermal physical parameters of the deep well type grounding electrode to be monitored are calculated and analyzed to obtain the monitoring result.

13. The deep well type grounding electrode thermal property monitoring system according to claim 12, characterized in that: The construction process of the grounding electrode temperature field distribution model includes: In response to the temperature measurement signal, the distribution of the test current is monitored to obtain the current density and current field data of the scaled-down deep-well type grounding electrode; In the process of training the grounding electrode temperature field distribution model according to the current density and the current field data, a temperature correction factor is introduced to obtain the trained grounding electrode temperature field distribution model.

14. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein when the device where the computer-readable storage medium is located executes the computer program, the method for monitoring thermal properties of a deep well grounding electrode as described in any one of claims 1 to 7 is implemented.

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