A monitoring method, system and medium for the thermal properties of a deep well type grounding electrode

Abstract

The present invention discloses a method and system for monitoring the thermal properties of a deep-well grounding electrode. The method includes determining the scaled-down deep-well grounding electrode parameters based on the actual physical parameters of the deep-well grounding electrode to be monitored, and configuring the corresponding scaled-down deep-well grounding electrode; after detecting the completion signal of the scaled-down deep-well grounding electrode being embedded in the grounding grid topology of the target substation, generating a configuration strategy for a temperature measurement device matching the scaled-down deep-well grounding electrode; after detecting that the configuration strategy has been executed, in response to a predetermined temperature measurement signal, acquiring the temperature change data output by the temperature measurement device; based on the multimodal analysis result of the temperature change data, determining the monitoring result of the thermal properties of the deep-well grounding electrode to be monitored; generating a matching grounding electrode optimization strategy with the monitoring result; the present invention can comprehensively understand the thermal properties of the deep-well grounding electrode and improve the operation safety of the substation.

Description

Technical Field

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

[0002] The deep well type grounding electrode has outstanding advantages such as low construction cost and strong terrain adaptability, making it gradually applied in the power system. As an important part of the grounding system, the safe operation of the deep well grounding electrode is crucial for the stability of the entire power system.

[0003] However, at present, the deep well type grounding electrode often faces challenges such as complex underground thermal physical properties and difficulty in controlling temperature rise. To address these challenges, the prior art monitors the temperature by installing temperature sensors on the deep well type grounding electrode. However, due to the complex environment in the deep well, the installation process of the sensor 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 inability to accurately monitor the temperature of the grounding electrode in a timely manner, affecting the safety and stability of power transmission equipment.

[0004] Therefore, it can be seen that how to effectively monitor the thermal physical properties of the deep well type grounding electrode has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

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

[0006] To solve the above technical problems, an embodiment of the present invention provides a monitoring method for the thermal physical properties of a deep well type grounding electrode, including:

[0007] Configuring a 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;

[0008] After detecting the completion signal of the scaled-down deep well type grounding electrode being embedded in the grounding grid topology of the target substation, generating a configuration strategy for a temperature measuring device matching the scaled-down deep well type grounding electrode;

[0009] After detecting that the configuration strategy is executed, in response to a predetermined temperature measuring signal, acquiring temperature change data output by the temperature measuring device;

[0010] Based on the multimodal analysis result of the temperature change data, determining the monitoring result of the thermal physical properties of the deep well type grounding electrode to be monitored;

[0011] Generating a grounding electrode optimization strategy matching the monitoring result.

[0012] Further, the configuration strategy includes:

[0013] Intelligently analyze the parameters of the scaled-down deep-well grounding electrode to determine the distribution density of the temperature measurement points of the scaled-down deep-well grounding electrode, so as to configure the corresponding length and number of temperature measurement optical fibers.

[0014] Further, based on the multimodal analysis results of the temperature change data, determining the monitoring results of the thermal physical properties of the deep-well grounding electrode to be monitored includes:

[0015] Analyze the temperature change data based on the time scale to construct a linear fitting model of the temperature rise and fall mode;

[0016] Use an optimization algorithm to solve the linear fitting model of the temperature rise and fall mode to obtain the modal coefficients of the temperature rise process and the modal coefficients of the temperature fall process;

[0017] According to the modal coefficients of the temperature rise process and the modal coefficients of the temperature fall process, obtain the monitoring results of the deep-well grounding electrode to be monitored.

[0018] Further, the construction process of the linear fitting model of the temperature rise and fall mode includes:

[0019] At the first current-carrying test time, construct a linear fitting model of the temperature rise mode, which is represented by the following formula:

[0020]

[0021] Wherein, is time, , , , , , are the modal coefficients of the temperature rise process, is the temperature of the temperature measurement point at time t;

[0022] At the second current-carrying test time, construct a linear fitting model of the temperature fall mode, which is represented by the following formula:

[0023]

[0024] Wherein, , , , , , are the modal coefficients of the temperature fall process.

[0025] Further, the obtaining of the monitoring results according to the modal coefficients of the temperature rise process and the modal coefficients of the temperature fall process includes:

[0026] Analyze the modal coefficients of the temperature rise process and the modal coefficients 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;

[0027] Input 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;

[0028] Extract key parameters from the temperature distribution, calculate and analyze the thermal physical parameters of the deep well type grounding electrode to be monitored to obtain the monitoring results.

[0029] Further, the construction process of the grounding electrode temperature field distribution model includes:

[0030] In response to the temperature measurement signal, monitor the distribution of the test current, and obtain the current density and current field data of the scaled-down deep well type grounding electrode;

[0031] During the process of training the grounding electrode temperature field distribution model according to the current density and the current field data, introduce a temperature correction factor to obtain the trained grounding electrode temperature field distribution model.

[0032] Further, obtaining the monitoring results according to the modal coefficients of the temperature rise process and the modal coefficients of the temperature drop process further includes:

[0033] Perform spatial partitioning on the scaled-down deep well type grounding electrode according to the temperature distribution, and determine the target temperature rise and temperature drop regions of the deep well type grounding electrode to be monitored according to the partitioning results;

[0034] When it is determined that the temperature in the monitored target temperature rise and temperature drop regions exceeds the set safety temperature threshold, trigger an alarm.

[0035] Another embodiment of the present invention provides a monitoring system for the thermal physical properties of a deep well type grounding electrode, and the system includes:

[0036] A parameter configuration module for configuring a corresponding scaled-down deep well type grounding electrode with 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;

[0037] A temperature measurement device configuration module for generating a configuration strategy for a temperature measurement device matching the scaled-down deep well type grounding electrode after detecting the completion signal of the scaled-down deep well type grounding electrode being embedded in the grounding grid topology of the target substation;

[0038] A temperature monitoring module for obtaining the temperature change data output by the temperature measurement device in response to a predetermined temperature measurement signal after detecting that the configuration strategy has been executed;

[0039] A modal analysis module, configured to determine the monitoring result of the thermal properties of the deep well grounding electrode to be monitored based on the multi-modal analysis result of the temperature change data.

[0040] Further, the temperature measuring device configuration module is specifically configured to:

[0041] Intelligently analyze the parameters of the scaled-down deep well grounding electrode, determine the distribution density of the temperature measuring points of the scaled-down deep well grounding electrode, and configure the temperature measuring optical fibers with corresponding lengths and quantities.

[0042] Further, the modal analysis module is specifically configured to:

[0043] Analyze the temperature change data based on a time scale, and construct a linear fitting model for the temperature rise and fall modes;

[0044] Use an optimization algorithm to solve the linear fitting model for the temperature rise and fall modes, and obtain the modal coefficients for the temperature rise process and the modal coefficients for the temperature drop process;

[0045] Obtain the monitoring result of the deep well grounding electrode to be monitored according to the modal coefficients for the temperature rise process and the modal coefficients for the temperature drop process.

[0046] Further, the construction process of the linear fitting model for the temperature rise and fall modes includes:

[0047] At the first current-carrying test time, construct a linear fitting model for the temperature rise mode, which is represented by the following formula:

[0048]

[0049] Wherein, is time, , , , , , are the modal coefficients for the temperature rise process, is the temperature of the point to be measured at time t;

[0050] At the second current-carrying test time, construct a linear fitting model for the temperature drop mode, which is represented by the following formula:

[0051]

[0052] Wherein, , , , , , are the modal coefficients for the temperature drop process.

[0053] Further, obtaining the monitoring result according to the temperature rise process modal coefficient and the temperature drop process modal coefficient includes:

[0054] Analyze the temperature rise process modal coefficient and the temperature drop process modal coefficient to determine the temperature rise influence index and the temperature drop influence index of the reduced-scale deep well type grounding electrode;

[0055] Input 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 reduced-scale deep well type grounding electrode;

[0056] Extract key parameters from the temperature distribution, calculate and analyze the thermal physical properties parameters of the deep well type grounding electrode to be monitored to obtain the monitoring result.

[0057] Further, the construction process of the grounding electrode temperature field distribution model includes:

[0058] In response to the temperature measurement signal, monitor the distribution of the test current, and obtain the current density and current field data of the reduced-scale deep well type grounding electrode;

[0059] During the process of training the grounding electrode temperature field distribution model according to the current density and the current field data, introduce a temperature correction factor to obtain the trained grounding electrode temperature field distribution model.

[0060] 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 monitoring method for the thermal physical properties of the deep well type grounding electrode as described above is implemented.

[0061] Compared with the prior art, the beneficial effects of the embodiments of the present invention are at least one of the following:

[0062] By establishing a reduced-scale deep well type grounding electrode and configuring an optical fiber temperature measurement system, the embodiments of the present invention can simulate the operating environment of the actual deep well grounding electrode, adjust the reduction ratio and test current according to actual needs, so as to more accurately test its thermal physical properties; by deeply analyzing the main mode, secondary mode and linear mode in the temperature data, a comprehensive multi-mode study of the thermal physical properties of the deep well type grounding electrode can be carried out, which helps to discover potential thermal problems of the deep well type grounding electrode, provides strong support for the safe operation of the deep well grounding electrode, and improves the stability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 is a schematic flow chart of the monitoring method for the thermal physical properties of the deep well type grounding electrode in one embodiment of the present invention;

[0064] Figure 2Schematic diagram of the temperature measurement optical fiber structure of the scaled-down deep well type grounding electrode in one embodiment of the present invention;

[0065] Figure 3 Schematic diagram of different modal decompositions in one embodiment of the present invention;

[0066] Figure 4 Schematic diagram of the solution effect of the measured temperature rise formula at the temperature measurement point in one embodiment of the present invention;

[0067] Figure 5 Modal waveform diagram of the temperature rise at the temperature measurement point in one embodiment of the present invention;

[0068] Figure 6 Schematic diagram of the solution effect of the measured temperature drop formula at the temperature measurement point in one embodiment of the present invention;

[0069] Figure 7 Modal waveform diagram of the temperature drop at the temperature measurement point in one embodiment of the present invention;

[0070] Figure 8 Schematic diagram of the structure of the monitoring system for the thermal properties of the deep well type grounding electrode in one embodiment of the present invention;

[0071] Figure 9 Schematic diagram of the structure of the device for monitoring the thermal properties of the deep well type grounding electrode in one embodiment of the present invention. Detailed implementation manners

[0072] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all 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 those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0073] In the description of the present application, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0074] In the description of the present application, it should be noted that, unless otherwise clearly defined 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are only for the purpose of illustration, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0075] In the description of the present 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 technical field to which the present invention belongs. 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 the present application can be understood according to specific circumstances.

[0076] It can be understood that as an important part of the grounding system, the safe operation of the deep well grounding electrode is crucial for the stability of the entire power system. Thermal physical parameters (such as thermal conductivity, specific heat capacity, etc.) are the key factors affecting the heat dissipation performance and temperature distribution of the grounding electrode. By conducting thermal physical tests on the deep well type grounding electrode, its heat dissipation performance and temperature change conditions can be understood, so as to ensure 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 physical properties of a deep well type grounding electrode. Specifically, please refer to Figure 1 , Figure 1 which is shown in one embodiment of the present invention and includes the following steps:

[0077] S1. Configure a 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.

[0078] It can be understood that the scaled-down deep well type grounding electrode can simulate the behavior of the real grounding electrode, thus greatly reducing the test cost. Based on this, in order to construct an accurate and reliable scaled-down deep well type grounding electrode in the embodiment of the present invention, the actual physical parameters of the deep well type grounding electrode to be monitored will be determined according to the actual deep well type grounding electrode project in the target area, including: size, depth, material, resistivity, current, etc.

[0079] Based on these actual parameters, according to the determined scaling ratio, calculate the parameters of the scaled-down deep-well type grounding electrode. In some embodiments of the present invention, it is optional to be under laboratory conditions, and it is clear that the test requirement is to verify the thermal physical properties of the grounding electrode. During this process, the historical data of previous similar tests can be referred to, to understand the influence of the scaling ratio on the test results, and to determine the scaling ratio according to the geometric similarity and electrical similarity between the actual deep-well grounding electrode and the scaled-down deep-well type grounding electrode.

[0080] Exemplarily, in some embodiments of the present invention, the parameters of the scaled-down deep-well type grounding electrode will be determined with reference to the deep-well depth, deep-well radius, and injected current parameters of the actual deep-well type grounding electrode. Specifically, please refer to Table 1 as follows:

[0081] Table 1 Test parameters obtained by referring to the parameters of the actual deep-well type grounding electrode

[0082]

[0083] It can be seen that the determined test parameters of the scaled-down deep-well type grounding electrode reflect the geometric characteristics and electrical characteristics of the actual deep-well grounding electrode. Based on this, configure the scaled-down deep-well type grounding electrode to ensure that the scaled-down grounding electrode can accurately simulate and reflect the performance of the actual grounding electrode to be monitored.

[0084] S2. After detecting the completion signal of the scaled-down deep-well type grounding electrode being embedded in the grounding grid topology of the target substation, generate a configuration strategy for the temperature measurement device that matches the scaled-down deep-well type grounding electrode.

[0085] After the construction of the scaled-down deep-well type grounding electrode is completed, in order to simulate the grounding system under actual working conditions, in the embodiments of the present invention, the scaled-down deep-well type grounding electrode is safely connected to the grounding grid of the substation through appropriate cables and test power supply equipment. This embodiment can complete the test wiring for 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 reliable electrical connection. It can be understood that during the test of the thermal physical properties of the grounding electrode, a certain current needs to be passed through the grounding electrode to observe its temperature change, and then analyze its thermal physical 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.

[0086] Select a high-precision temperature measurement device suitable for high-temperature environments, and through intelligent analysis of the parameters of the scaled-down deep-well type grounding electrode, determine the distribution density of the temperature measurement points of the scaled-down deep-well type grounding electrode, and arrange the corresponding length and number of temperature measurement optical fibers at the key positions of the scaled-down deep-well type grounding electrode.

[0087] Exemplarily, 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. Specifically, please refer to Figure 2 , Figure 2 which shows a schematic diagram of the temperature-measuring optical fiber structure of the scaled-down deep-well type grounding electrode in one embodiment of the present invention.

[0088] S3. After detecting that the configuration strategy has been executed, in response to a predetermined temperature-measuring signal, obtain the temperature change data output by the temperature-measuring device.

[0089] After configuring the temperature-measuring device, in response to a predetermined temperature-measuring signal, under the support of the test current value determined from the parameters of the scaled-down deep-well type grounding electrode, inject a corresponding test current into the scaled-down deep-well type grounding electrode, and perform a temperature rise and temperature drop test on the scaled-down deep-well type grounding electrode for a specific time.

[0090] Exemplarily, in some embodiments of the present invention, a temperature rise / drop test of not less than 12 h is performed with the test current. For example, during the temperature rise process, if the temperature of any temperature-measuring point of the temperature-measuring optical fiber exceeds 90 °C (363.15 K) during the test period, the current flow is stopped, and the temperature-measuring optical fiber will record the temperature change curves of all temperature-measuring points throughout the process. Through the above operations in this step, the thermal behavior of the real grounding electrode under the action of current can be simulated, so as to obtain the key temperature change data for subsequent modal analysis.

[0091] S4. Based on the multi-modal analysis results of the temperature change data, determine the monitoring results of the thermal physical properties of the deep-well type grounding electrode to be monitored.

[0092] The embodiments of the present invention will analyze the temperature change data based on the time scale, and apply fitting formulas such as linear regression and exponential decay to describe the temperature rise and temperature drop processes. That is, a multi-modal analysis of the thermal physical properties of the deep-well type grounding electrode is realized by constructing a mathematical model of linear fitting of the temperature rise and fall modes.

[0093] It can be understood that the current flow test time refers to the time length under specific test conditions, applying a specified current value to a device or component and lasting for a period of time to observe its performance changes. Based on this, in the embodiments of the present invention, a temperature rise mode linear fitting model is constructed under the set first current flow test time.

[0094] In this embodiment, one of the temperature-measuring points is selected and named , as the number ( = 1, 2, …, n, where n is the number of all temperature measurement points). Take the time of the through-flow test as the zero moment (t = 0), then the modal fitting formula for the temperature rise process is expressed as follows:

[0095]

[0096] Wherein, is the time, 、 、 、 、 、 are the modal coefficients of the temperature rise process, is the temperature of the monitored temperature measurement point at time t.

[0097] For the description of the modal coefficients of the temperature rise process, please specifically refer to Table 2 shown below:

[0098] Table 2 Description of A x 、B x 、C x 、D x 、E x 、F x

[0099]

[0100] It can be seen that the embodiment of the present invention takes into account the change of the temperature of the predicted temperature measurement point over time, and selects to simulate the main / secondary modes through functions, that is 、 These two respectively reflect different decaying modal exponential function terms. In addition to the decaying mode, there may be other types of temperature changes, such as linear growth or decline. Therefore, a linear term is added to the formula to represent this possible linear change.

[0101] For the above multi-modal decomposition process, please refer to Figure 3 shown in Figure 3 which shows a schematic diagram of different modal decompositions in one embodiment of the present invention. It can be seen from Figure 3 that different modal analyses of the collected temperature data will exhibit different linear change characteristics.

[0102] Then, similarly, the embodiment of the present invention constructs a linear fitting model for the temperature drop mode at the set second through-flow test time. Let the moment when the power supply through-flow test stops be the zero moment (t = 0), then the modal fitting formula for the temperature drop process is expressed as follows:

[0103]

[0104] Wherein,​ , , , , , are the modal coefficients for the temperature drop process.

[0105] Furthermore, in order to determine the values of the temperature rise modal coefficients and the modal coefficients for the temperature drop process, so as to obtain the thermal properties of the grounding electrode reflected by the thermal property test results, the embodiments of the present invention use an optimization algorithm to solve the linear fitting model of the temperature rise and fall modes.

[0106] As an example, in some embodiments of the present invention, two sets of modal linear fitting models are solved by the least squares method to obtain the modal coefficients for the temperature rise process and the modal coefficients for the temperature drop process.

[0107] Specifically, taking the actual test data of a certain temperature rise process as an example, the result obtained by using the optimization algorithm to solve the modal fitting formula of the temperature rise process is expressed as follows:

[0108]

[0109] For the specific solution situation, please refer to Figure 4 , Figure 4 which shows the schematic diagram of the solution effect of the measured temperature rise formula at the temperature measurement point in one of the embodiments of the present invention. And the specific temperature rise modal waveform is shown in Figure 5 as shown.

[0110] Similarly, taking the actual test data of a certain temperature drop process as an example, the result obtained by using the optimization algorithm to solve the modal fitting formula of the temperature drop process is expressed as follows:

[0111]

[0112] For the specific solution situation, please refer to Figure 6 , Figure 6 which shows the schematic diagram of the solution effect of the measured temperature rise formula at the temperature measurement point in one of the embodiments of the present invention. And the specific temperature rise modal waveform is shown in Figure 7 as shown.

[0113] According to the obtained modal coefficients and the modal decomposition schematic diagram, the embodiments of the present invention obtain the evaluation and analysis test results of the thermal properties of the deep well type grounding electrode by combining the results obtained by solving the above fitting formula. Specifically, please refer to Table 3 shown below:

[0114] Table 3 Analysis of the Thermal Properties of the Deep Well Type Grounding Electrode

[0115]

[0116] It can be seen that these modal coefficients fully reflect the thermal properties generated by the grounding electrode during the temperature rise and fall processes, such as key parameters like the thermal diffusivity of the soil and the soil temperature time. The embodiments of the present invention compare and analyze 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.

[0117] In some embodiments of the present invention, an example of the temperature rise analysis of a deep well type grounding electrode within 48 hours is given. Specifically, in combination with the modal fitting formula of the temperature rise process, when the actual injection current of the deep well type grounding electrode is then the temperature rise modal fitting formula within 48 hours is expressed as follows:

[0118]

[0119]

[0120] Wherein, represents a constant related to the thermal properties of the soil.

[0121] It can be understood that due to the long test time, the linear growth part of the temperature rise will become more significant because the heat accumulation effect inside the device 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 the current and the thermal properties of the soil, indicating that when the ratio of the injection current to the thermal diffusivity increases, the temperature rise will increase at a faster rate.

[0122] By constructing the above two formulas, the correlation between the modal coefficients and thermal property parameters such as the soil thermal diffusivity and the soil temperature time constant is deeply studied, and further the temperature rise influence index and temperature drop influence index of the scaled-down deep well type grounding electrode are determined. Exemplarily, 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.

[0123] Input 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. In some embodiments of the present invention, the temperature distribution includes the direction information of the temperature field and the spatial distribution information of the heat dissipation.

[0124] Specifically, regarding the construction of the grounding electrode temperature field distribution model, in some embodiments of the present invention, exemplarily, numerical methods such as finite element analysis, finite difference method, or thermal network method are selected to construct the grounding electrode temperature field distribution model.

[0125] Under the condition of responding to the temperature measurement signal, it is first necessary to monitor the distribution of the test current in combination with a high-precision current measurement device, obtain the current density and current field data of the deep well grounding electrode, and perform preprocessing operations such as data cleaning and outlier rejection.

[0126] 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.

[0127] It can be understood that in the embodiment of the present invention, a temperature correction factor is designed to correct the temperature prediction value in the model to more accurately reflect the actual temperature distribution. In this process, a quantitative analysis of the set correction factor is required, and the quantified correction factor is integrated into the grounding electrode temperature field distribution model. During the model training process, the correction factor is used as one of the input variables and is used to train the model together with the current density and current field data.

[0128] In the model prediction process, according to the actual current distribution and soil parameters, etc., by adjusting the value of the correction factor, a more accurate temperature prediction result can be obtained.

[0129] Extract key parameters from the temperature distribution output by the above-mentioned grounding electrode temperature field distribution model, calculate and analyze the thermal physical parameters of the deep well grounding electrode to be monitored, so as to realize the thermal physical property monitoring of the deep well grounding electrode and obtain the monitoring result.

[0130] Specifically, in the embodiment of the present invention, key temperature parameters are extracted from the temperature distribution. The key parameters include the highest temperature, the lowest 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 positions. Using the extracted temperature parameters and other known conditions, such as current, resistance, time, and combining with thermal principles such as heat conduction, heat convection and heat 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.

[0131] 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 grounding electrode is spatially divided according to the temperature distribution to determine the target temperature rise and temperature drop regions of the deep well grounding electrode to be monitored, that is, the maximum temperature rise and maximum temperature drop regions. After determining the maximum temperature rise and temperature drop regions, it is judged whether the temperature in this monitored region exceeds the set safety temperature threshold, and then an alarm is triggered.

[0132] It can be understood that in some embodiments of the present invention, after obtaining the monitoring result, a grounding electrode optimization strategy matching the monitoring result will be generated.

[0133] After analyzing, evaluating, and calculating the thermal properties of the grounding electrode and completing the test, the embodiments of the present invention formulate a targeted grounding electrode optimization strategy based on the data generated during the test process. The grounding electrode optimization strategy at least includes a soil optimization strategy, a resistance optimization strategy, and a grounding electrode material optimization strategy, and involves aspects such as grounding electrode material and structure design, soil treatment, and installation and maintenance. Exemplarily, materials with higher thermal conductivity and lower thermal resistance are selected as the manufacturing materials of the grounding electrode, or the shape and size of the grounding electrode are optimized to improve its heat dissipation performance. For the problem of poor soil conductivity or too high resistivity, methods such as adding conductive substances or improving the soil structure can be adopted to enhance the conductive performance of the soil.

[0134] In summary, the embodiments of the present invention construct a scaled-down deep well type grounding electrode through the geometric and electrical characteristics of the actual deep well grounding electrode, which not only reduces the test cost but also improves the flexibility and accuracy of the test; based on the designed scaled-down deep well type grounding electrode, a temperature rise / fall test with multi-modal analysis is carried out through the configured temperature measurement system, accurately monitoring the temperature change of the scaled-down deep well type grounding electrode during the test process, and being able to more comprehensively understand the thermal property characteristics of the deep well grounding electrode, so as to realize the targeted optimization and maintenance of the grounding electrode and improve the operation safety of the substation.

[0135] Another embodiment of the present invention provides a monitoring system for the thermal properties of a deep well type grounding electrode. Specifically, please refer to Figure 8 , Figure 8 which shows a schematic structural diagram of the monitoring system for the thermal properties of a deep well type grounding electrode in one of the embodiments of the present invention. The system includes:

[0136] A parameter configuration module M1, configured to configure a corresponding scaled-down deep well type grounding electrode according to the scaled-down deep well type grounding electrode parameters determined by the actual physical parameters of the deep well type grounding electrode to be monitored.

[0137] A temperature measurement device configuration module M2, configured to generate a configuration strategy for a temperature measurement device matching the scaled-down deep well type grounding electrode after detecting the completion signal of the scaled-down deep well type grounding electrode being embedded in the grounding grid topology of the target substation.

[0138] A temperature monitoring module M3, configured to obtain the temperature change data output by the temperature measurement device in response to a predetermined temperature measurement signal after detecting that the configuration strategy has been executed.

[0139] A modal analysis module M4, configured 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.

[0140] Exemplarily, in this embodiment, through the temperature measurement device configuration module, intelligent analysis is performed on the parameters of the scaled-down deep well type grounding electrode to determine the distribution density of the temperature measurement points of the scaled-down deep well type grounding electrode, so as to configure the temperature measurement optical fibers with corresponding lengths and quantities.

[0141] Exemplarily, in this embodiment, through the modal analysis module, multi-modal analysis is performed on the temperature change data. Specifically:

[0142] Analyze the temperature change data based on the time scale, and construct a linear fitting model for the temperature rise and fall mode;

[0143] Use an optimization algorithm to solve the linear fitting model of the temperature rise and fall mode to obtain the modal coefficients of the temperature rise process and the modal coefficients of the temperature drop process;

[0144] According to the modal coefficients of the temperature rise process and the modal coefficients of the temperature drop process, obtain the monitoring results of the deep well type grounding electrode to be monitored.

[0145] Specifically, the construction process of the linear fitting model of the temperature rise and fall mode includes:

[0146] At the first current-carrying test time, construct a linear fitting model for the temperature rise mode, which is represented by the following formula:

[0147]

[0148] Wherein, is time, 、 、 、 、 、 are the modal coefficients of the temperature rise process, is the temperature of the point to be measured at time t;

[0149] At the second current-carrying test time, construct a linear fitting model for the temperature drop mode, which is represented by the following formula:

[0150]

[0151] Wherein, 、 、 、 、 、 are the modal coefficients of the temperature drop process.

[0152] In the embodiment of the present invention, the process of obtaining the monitoring results according to the modal coefficients of the temperature rise process and the modal coefficients of the temperature drop process specifically includes:

[0153] Analyze the modal coefficients of the temperature rise process and the modal coefficients 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;

[0154] Input 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;

[0155] Extract key parameters from the temperature distribution, calculate and analyze the thermal physical properties parameters of the deep well type grounding electrode to be monitored to obtain the monitoring results.

[0156] Exemplarily, the construction process of the grounding electrode temperature field distribution model specifically includes:

[0157] In response to the temperature measurement signal, monitor the distribution of the test current, and obtain the current density and current field data of the scaled-down deep well type grounding electrode;

[0158] In the process of training the grounding electrode temperature field distribution model according to the current density and the current field data, introduce a temperature correction factor to obtain the trained grounding electrode temperature field distribution model.

[0159] In another embodiment of the present invention, a monitoring device for the thermal physical properties of a deep well type grounding electrode is further provided. Specifically, please refer to Figure 9 shown.

[0160] It can be understood that the device is connected to the monitoring system for the thermal physical properties of the deep well type grounding electrode, and includes a scaled-down deep well type grounding electrode, a temperature measurement system, a grounding grid, and a test power supply.

[0161] As Figure 9 shown, the scaled-down deep well type grounding electrode is connected to the test power supply and the substation grounding grid through a cable, and the test power supply is used to provide current support for the scaled-down deep well type grounding electrode. An example provided by the present invention is: simulating the monitoring process of the thermal physical properties of a grounding electrode with a deep well structure of 35m. As can be seen from Figure 8 it, the constructed scaled-down deep well type grounding electrode is supported by a steel pipe and filled with coke.

[0162] The temperature measurement system is arranged on the scaled-down deep well type grounding electrode, and is used to monitor and collect temperature data in real time and send 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 for relevant personnel to monitor in real time.

[0163] It can be understood that the temperature measurement system in this embodiment further includes a distributed temperature measurement optical fiber, a temperature calibration device, and a data acquisition device; combined with Figure 2 it can be seen that the distributed temperature measurement optical fiber is arranged on one side of the steel pipe.

[0164] Among them, the distributed temperature-measuring optical fiber collects in real time the temperature data generated by the scaled-down deep-well type grounding electrode during the temperature rise and fall processes, and sends the temperature data to the temperature calibration device for correction. The data acquisition device converts the received corrected data into an electrical signal and sends it to the monitoring system for analysis.

[0165] In some other embodiments of the present invention, the device further includes an early warning module. When the detected temperature data exceeds a preset safe temperature threshold, the monitoring system sends an early warning signal to the early warning module to trigger an alarm.

[0166] Correspondingly, an embodiment of the present invention provides a computer-readable storage medium. The computer-readable storage medium includes a stored computer program. Among them, when the computer program runs, it controls the device where the computer-readable storage medium is located to execute the steps in the monitoring method of the thermal physical properties of the deep-well type grounding electrode in the above embodiments, such as Figure 1 the steps S1 to S4 described above. The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended 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 results of the temperature change data, the monitoring results of the thermal properties of the deep well type grounding electrode to be monitored are determined, specifically including: analyzing the temperature change data based on the time scale to construct a temperature rise and fall modal linear fitting model; solving the temperature rise and fall modal linear fitting model using an optimization algorithm to obtain the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process; according to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process, obtaining the monitoring results of the deep well type grounding electrode to be monitored; The process of constructing the temperature rise and fall modal linear fitting model specifically includes: constructing a temperature rise modal linear fitting model at the first flow test time, 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.

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 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.

4. The method for monitoring thermal properties of a deep well grounding electrode according to claim 3, 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.

5. The method for monitoring thermal properties of a deep well grounding electrode according to claim 3, 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 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.

6. A monitoring system for thermal properties of deep well grounding electrodes, 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; A 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 multimodal analysis results of the temperature change data, specifically including: analyzing the temperature change data based on the time scale to construct a temperature rise and fall modal linear fitting model; solving the temperature rise and fall modal linear fitting model using an optimization algorithm to obtain the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process; according to the modal coefficient of the temperature rise process and the modal coefficient of the temperature drop process, obtaining the monitoring results of the deep well type grounding electrode to be monitored; The process of constructing the temperature rise and fall modal linear fitting model specifically includes: constructing a temperature rise modal linear fitting model at the first flow test time, 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.

7. The deep well type grounding electrode thermal property monitoring system according to claim 6, 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.

8. The deep well type grounding electrode thermal property monitoring system according to claim 6, 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.

9. The deep well type grounding electrode thermal property monitoring system as claimed in claim 8, 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.

10. 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 5 is implemented.

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