Substation metal water pipe laying design method and device based on experimental simulation

Abstract

The invention discloses a transformer substation metal water pipe laying design method and device based on experimental simulation, and belongs to the field of metal water pipe laying. According to the method, accurate data are provided for building an experimental simulation model fitting reality by obtaining target transformer substation soil, the maximum earth current, a grounding grid and metal water pipe parameters; it is ensured that the model truly reflects actual conditions; experimental simulation models of different laying scenes are built according to a preset proportion, and a reliable platform is built for an experiment; testing current is applied to the model and potential data is obtained, so that the defect that the prior art depends on experience and lacks data verification is overcome; simulation contact voltage and step voltage are calculated, and a foundation is laid for inversion; the actual voltage parameter is reversely deduced, a final laying scheme is determined according to the actual voltage parameter, design safety and reliability are ensured on the basis of data, and the problem that an existing metal water pipe laying scheme is unreasonable due to empirical design is solved.

Description

Technical Field

[0001] This invention relates to the field of metal water pipe laying, and in particular to a design method and apparatus for laying metal water pipes in substations based on experimental simulation. Background Technology

[0002] Metal water pipes in substations (such as fire hydrants and domestic water pipes) are typically laid in metal due to their good mechanical strength and electrical conductivity. However, in the event of a fault in the substation's grounding system, these metal pipes can become pathways for potential transfer, causing high or low potentials to propagate along the pipes and generating dangerous contact and step voltages near the insulation sections. This potential transfer phenomenon can endanger the safety of maintenance personnel or nearby residents. Therefore, it is necessary to accurately assess the impact of different pipe laying methods (such as buried, overhead insulation, and overhead grounding) on ​​potential transfer to ensure that the substation design meets safety standards.

[0003] However, the existing design methods for laying metal water pipes in substations are mainly based on human experience, and lack experimental simulation to verify the reliability and effectiveness of the design results, resulting in unreasonable design schemes for laying metal water pipes in substations. Summary of the Invention

[0004] This invention provides a design method and apparatus for laying metal water pipes in substations based on experimental simulation. It can solve the problem that the existing design methods for laying metal water pipes in substations are mainly based on human experience, and lack experimental simulation to verify the reliability and effectiveness of the design results, resulting in unreasonable design schemes for laying metal water pipes in substations.

[0005] To address the aforementioned technical problems, one embodiment of the present invention provides a substation metal water pipe laying design method based on experimental simulation, comprising:

[0006] Obtain the soil, actual maximum ground current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation;

[0007] Based on the soil, actual maximum ground current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation, an experimental simulation model of the target substation under different metal water pipe laying scenarios is constructed according to a preset ratio; wherein, the experimental simulation model includes a simulated grounding grid and a simulated metal water pipe;

[0008] Test currents were applied to experimental simulation models under different metal water pipe laying scenarios, and potential data of simulated grounding grids and simulated metal water pipes under different metal water pipe laying scenarios were obtained;

[0009] Based on the potential data of the simulated grounding grid and simulated metal water pipes in each metal water pipe laying scenario, calculate the contact voltage and step voltage of the simulated metal water pipes in each metal water pipe laying scenario.

[0010] Based on the simulated contact voltage and step voltage of metal water pipes under various metal water pipe laying scenarios, inversion calculations are performed to obtain the actual contact voltage and actual step voltage of actual substation metal water pipes under different metal water pipe laying scenarios.

[0011] Based on the actual contact voltage and actual step voltage of the metal water pipes in the actual substation under different metal water pipe laying scenarios, the final substation metal pipe laying design scheme is determined.

[0012] Furthermore, the different metal water pipe laying scenarios include buried, overhead insulated, and overhead grounded;

[0013] The experimental simulation model of the target substation under different metal water pipe laying scenarios is constructed according to a preset ratio based on the soil, actual maximum grounding current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation. This includes:

[0014] Based on the actual grounding grid parameters and actual metal water pipe parameters of the target substation, a simulated grounding grid and simulated metal water pipe are constructed according to a preset ratio, and the simulated grounding grid is buried to a preset depth.

[0015] Test current is connected to the middle of the simulated grounding grid, and one end of the simulated grounding grid is connected to one end of the simulated metal water pipe. The laying method of the simulated metal water pipe is set to buried, overhead insulation and overhead grounding, so as to obtain an experimental simulation model of the metal water pipe laying scenario as buried, overhead insulation and overhead grounding.

[0016] Furthermore, the step of applying test current to the experimental simulation model under different metal water pipe laying scenarios and obtaining potential data of the simulated grounding grid and simulated metal water pipes under different metal water pipe laying scenarios includes:

[0017] The same test current was applied to the experimental simulation models of buried, overhead insulated, and overhead grounded metal water pipe laying scenarios, and the potential data of the simulated grounding grid and the potential data of different locations of the simulated metal water pipe under different metal water pipe laying scenarios were obtained by using a multimeter at preset distances.

[0018] Furthermore, the step of calculating the contact voltage and step voltage of the simulated metal water pipes in each metal water pipe laying scenario based on the potential data of the simulated grounding grid and simulated metal water pipes in each scenario includes:

[0019] For each metal water pipe laying scenario, based on the potential data of the simulated grounding network and the potential data of each location of the simulated metal water pipe, the potential difference between the simulated grounding network and each location of the simulated metal water pipe is calculated, the contact voltage at each location of the simulated metal water pipe is obtained, and then the contact voltage distribution result of the simulated metal water pipe is obtained.

[0020] Based on the potential data at various locations of the simulated metal water pipe, the potential difference between two adjacent locations is calculated to obtain the step voltage between two adjacent locations of the simulated metal water pipe, and then the contact voltage distribution of the simulated metal water pipe is obtained.

[0021] Furthermore, the inversion calculation based on the simulated contact voltage and step voltage of the metal water pipes under various metal water pipe laying scenarios yields the actual contact voltage and actual step voltage of the actual substation metal water pipes under different metal water pipe laying scenarios, including:

[0022] For each metal water pipe laying scenario, the impedance of the actual grounding grid is calculated based on the soil resistivity of the target substation and the grounding grid area of ​​the actual grounding grid parameters. The actual maximum grounding voltage of the actual grounding grid is calculated based on the impedance of the actual grounding grid and the actual maximum grounding current.

[0023] Based on the soil resistivity of the target substation and the area of ​​the simulated grounding grid, the impedance of the simulated grounding grid is calculated, and based on the impedance of the simulated grounding grid and the test current, the test grounding voltage of the simulated grounding grid is calculated.

[0024] Based on the actual maximum ground voltage of the actual grounding grid and the test ground voltage of the simulated grounding grid, calculate the ground voltage ratio between the actual grounding grid and the simulated grounding grid, and use the ground voltage ratio as the inversion parameter;

[0025] The contact voltage and step voltage of the simulated metal water pipe are multiplied by the inversion parameters to obtain the actual contact voltage and actual step voltage of the actual metal water pipe in the substation.

[0026] Furthermore, the impedance of the grounding grid is calculated using the following formula:

[0027]

[0028] Where R is the impedance of the grounding grid; ρ is the soil resistivity; and S is the area of ​​the grounding grid.

[0029] Furthermore, the final substation metal pipe laying design scheme is determined based on the actual contact voltage and actual step voltage of the actual substation metal water pipes under different metal pipe laying scenarios, including:

[0030] For each metal water pipe laying scenario, the actual contact voltage of the actual substation metal water pipe is compared with the contact voltage safety threshold, and the actual step voltage of the actual substation metal water pipe is compared with the step voltage safety threshold. Metal water pipe laying scenarios where the actual contact voltage is less than the contact voltage safety threshold and the actual step voltage is less than the step voltage safety threshold are selected as candidate metal water pipe laying scenarios.

[0031] For each candidate metal water pipe laying scenario, the percentage values ​​of actual contact voltage and actual step voltage relative to their respective safety thresholds are calculated. Based on the percentage values ​​of actual contact voltage and actual step voltage relative to their respective safety thresholds, combined with the preset weight values ​​of actual contact voltage and actual step voltage, the comprehensive voltage index of each candidate laying scenario is calculated.

[0032] The candidate laying scenario with the lowest comprehensive voltage index will be used as the final design scheme for laying metal pipelines in the substation.

[0033] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments;

[0034] An embodiment of the present invention provides a design device for laying metal water pipes in substations based on experimental simulation, comprising: a data acquisition module, an experimental simulation model construction module, a simulation measurement module, a simulation voltage calculation module, an inversion calculation module, and a laying scheme generation module;

[0035] The data acquisition module is used to acquire the soil, actual maximum ground current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation.

[0036] The experimental simulation model construction module is used to construct experimental simulation models of the target substation under different metal water pipe laying scenarios according to a preset ratio based on the soil, actual maximum grounding current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation; wherein, the experimental simulation model includes a simulated grounding grid and a simulated metal water pipe;

[0037] The simulation measurement module is used to apply test current to the experimental simulation model under different metal water pipe laying scenarios, and to obtain the potential data of the simulated grounding grid and simulated metal water pipe under different metal water pipe laying scenarios.

[0038] The simulated voltage calculation module is used to calculate the contact voltage and step voltage of the simulated metal water pipe in each metal water pipe laying scenario based on the potential data of the simulated grounding grid and the simulated metal water pipe in each metal water pipe laying scenario.

[0039] The inversion calculation module is used to perform inversion calculations based on the contact voltage and step voltage of the simulated metal water pipes under various metal water pipe laying scenarios, so as to obtain the actual contact voltage and actual step voltage of the actual substation metal water pipes under different metal water pipe laying scenarios.

[0040] The laying scheme generation module is used to determine the final laying design scheme for substation metal pipes based on the actual contact voltage and actual step voltage of the actual substation metal pipes under different metal pipe laying scenarios.

[0041] Furthermore, the inversion calculation based on the simulated contact voltage and step voltage of the metal water pipes under various metal water pipe laying scenarios yields the actual contact voltage and actual step voltage of the actual substation metal water pipes under different metal water pipe laying scenarios, including:

[0042] For each metal water pipe laying scenario, the impedance of the actual grounding grid is calculated based on the soil resistivity of the target substation and the grounding grid area of ​​the actual grounding grid parameters. The actual maximum grounding voltage of the actual grounding grid is calculated based on the impedance of the actual grounding grid and the actual maximum grounding current.

[0043] Based on the soil resistivity of the target substation and the area of ​​the simulated grounding grid, the impedance of the simulated grounding grid is calculated, and based on the impedance of the simulated grounding grid and the test current, the test grounding voltage of the simulated grounding grid is calculated.

[0044] Based on the actual maximum ground voltage of the actual grounding grid and the test ground voltage of the simulated grounding grid, calculate the ground voltage ratio between the actual grounding grid and the simulated grounding grid, and use the ground voltage ratio as the inversion parameter;

[0045] The contact voltage and step voltage of the simulated metal water pipe are multiplied by the inversion parameters to obtain the actual contact voltage and actual step voltage of the actual metal water pipe in the substation.

[0046] Furthermore, the impedance of the grounding grid is calculated using the following formula:

[0047]

[0048] Where R is the impedance of the grounding grid; ρ is the soil resistivity; and S is the area of ​​the grounding grid.

[0049] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0050] This invention provides accurate foundational data for constructing a realistic experimental simulation model of the target substation by acquiring soil, actual maximum grounding current, actual grounding grid parameters, and actual metal water pipe parameters. This ensures the model accurately reflects the actual conditions of the substation and avoids deviations in subsequent simulation results due to inaccurate data. Based on these parameters, experimental simulation models of the target substation under different metal water pipe laying scenarios are constructed according to a preset ratio. This model comprehensively and meticulously presents different laying scenarios, providing a reliable platform for subsequent experimental simulations and solving the problem of insufficient experimental simulation foundation in existing technologies. Test currents are applied to the experimental simulation models under different metal water pipe laying scenarios, and potential data of the simulated grounding grid and simulated metal water pipes are acquired, providing strong support for subsequent calculations and overcoming the shortcomings of existing technologies that rely solely on human experience and lack data verification. Based on the potential data under each scenario... The contact voltage and step voltage of simulated metal water pipes are calculated, and the acquired raw data are transformed to obtain more practically meaningful safety index data, laying the foundation for subsequent inversion calculations. Based on these simulation data, the actual contact voltage and actual step voltage of metal water pipes in actual substations under different scenarios are calculated, accurately mapping the simulation results to the actual situation. Finally, the final substation metal pipe laying design scheme is determined based on the actual contact voltage and step voltage. The design is based on scientific data, avoiding the irrationality caused by human experience design, ensuring the safety and reliability of the design scheme. This solves the problem that the existing substation metal water pipe laying design method is mainly based on human experience, lacking experimental simulation to verify the reliability and effectiveness of the design results, resulting in unreasonable substation metal water pipe laying design schemes. Attached Figure Description

[0051] Figure 1 A flowchart illustrating the steps of a substation metal water pipe laying design method based on experimental simulation, provided for an embodiment of the present invention;

[0052] Figure 2 The experimental wiring topology diagram of the experimental simulation model provided in the embodiments of the present invention;

[0053] Figure 3 An experimental simulation result diagram of buried metal water pipes provided in an embodiment of the present invention;

[0054] Figure 4 An experimental simulation result diagram of the overhead metal water pipes provided in an embodiment of the present invention;

[0055] Figure 5 The diagram shows the contact voltage results of the actual grounding grid obtained by inversion calculation under different metal water pipe laying scenarios provided in the embodiments of the present invention.

[0056] Figure 6This is a module diagram of a substation metal water pipe laying design device based on experimental simulation, provided as an embodiment of the present invention. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] In the description of this invention, it should be understood that the term "first" is used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0059] Example 1:

[0060] Reference Figure 1 This invention provides a flowchart of a substation metal water pipe laying design method based on experimental simulation. To address the problem that existing substation metal water pipe laying design methods primarily rely on human experience, lacking experimental simulation to verify the reliability and effectiveness of the design results, leading to unreasonable substation metal water pipe laying designs, this method includes at least the following steps:

[0061] Step S1: Obtain the soil, actual maximum grounding current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation;

[0062] In this embodiment, soil resistivity testing can be conducted in the substation area using the Wenner four-electrode method. Five typical measuring points are selected, and the average soil resistivity is measured. This average soil resistivity is then used as the soil resistivity of the target substation. The actual maximum grounding current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation can be extracted from the substation's design documents. The grounding grid parameters include the area, grid spacing, material, and material diameter of the grounding grid. The metal water pipe parameters include the length, material, and material diameter.

[0063] Step S2: Based on the soil, actual maximum grounding current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation, construct experimental simulation models of the target substation under different metal water pipe laying scenarios according to a preset ratio; wherein, the experimental simulation model includes a simulated grounding grid and a simulated metal water pipe;

[0064] In this embodiment, the different metal water pipe laying scenarios include buried, overhead insulated, and overhead grounded; the experimental simulation model of the target substation under different metal water pipe laying scenarios is constructed according to a preset ratio based on the soil, actual maximum grounding current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation, including:

[0065] Based on the actual grounding grid parameters and actual metal water pipe parameters of the target substation, a simulated grounding grid and simulated metal water pipe are constructed according to a preset ratio, and the simulated grounding grid is buried to a preset depth.

[0066] Test current is connected to the middle of the simulated grounding grid, and one end of the simulated grounding grid is connected to one end of the simulated metal water pipe. The laying method of the simulated metal water pipe is set to buried, overhead insulation and overhead grounding, so as to obtain an experimental simulation model of the metal water pipe laying scenario as buried, overhead insulation and overhead grounding.

[0067] For example, the area of ​​the simulated grounding grid is set to 60×60cm. 2 The grid spacing is set to 6.6cm, the material is set to 3mm diameter round steel, the size of the simulated metal water pipe is set to 2m in length, and the material is set to 2.5mm diameter iron wire conductor; the simulated grounding grid is buried to a soil depth of 10cm; a current injection lead is connected in the middle of the simulated grounding grid to connect the test current, and the test current with a frequency of 128Hz and an amplitude of 1A is output by adjusting the frequency converter power supply.

[0068] ① The simulated metal water pipe is laid underground: the simulated metal water pipe conductor is buried along the center line of the simulated grounding grid at the edge of the simulated grounding grid, with a burial depth of 7cm;

[0069] ② The simulated metal water pipe is laid in an overhead insulation manner: the simulated metal water pipe conductor is suspended 10cm above the ground along the center line of the simulated grounding grid at the edge of the simulated grounding grid, and an insulating board is arranged every 20cm as an overhead support.

[0070] ③ The simulated metal water pipe is laid in an overhead grounding manner: the simulated metal water pipe conductor is suspended 10cm above the ground along the center line of the simulated grounding grid at the edge of the simulated grounding grid, and a metal plate is arranged every 20cm as an overhead support.

[0071] Step S3: Apply test current to the experimental simulation model under different metal water pipe laying scenarios, and obtain the potential data of the simulated grounding grid and simulated metal water pipe under different metal water pipe laying scenarios;

[0072] In this embodiment, applying test current to the experimental simulation model under different metal water pipe laying scenarios and obtaining potential data of the simulated grounding grid and simulated metal water pipes under different metal water pipe laying scenarios includes:

[0073] The same test current was applied to the experimental simulation models of buried, overhead insulated, and overhead grounded metal water pipe laying scenarios, and the potential data of the simulated grounding grid and the potential data of different locations of the simulated metal water pipe under different metal water pipe laying scenarios were obtained by using a multimeter at preset distances.

[0074] In this embodiment, refer to Figure 2 The diagram below shows the experimental wiring topology of the experimental simulation model provided in this embodiment of the invention. The voltage electrode P2 is placed 30m away from the simulated grounding grid (much larger than the size of the simulated grounding grid, and is regarded as the zero potential point). The current return electrode C2 is placed 5D away from the grounding grid (D is the maximum diagonal length of the simulated grounding grid). The current electrode C1 is connected to the injection point, and the voltage electrode P1 is connected to the test point of the simulated metal water pipe. The position of P1 is changed along the center line of the grounding grid, and the potential data of the simulated grounding grid and the potential data of the test points at different positions of the simulated metal water pipe are obtained by using a multimeter.

[0075] Step S4: Based on the potential data of the simulated grounding grid and simulated metal water pipes in each metal water pipe laying scenario, calculate the contact voltage and step voltage of the simulated metal water pipes in each metal water pipe laying scenario.

[0076] In this embodiment, refer to Figure 3 and Figure 4 The figures provided are experimental simulation results of buried metal water pipes and overhead metal water pipes, respectively, provided in the embodiments of the present invention. The step of calculating the contact voltage and step voltage of the simulated metal water pipes in each metal water pipe laying scenario based on the potential data of the simulated grounding grid and the simulated metal water pipes in each scenario includes:

[0077] For each metal water pipe laying scenario, based on the potential data of the simulated grounding network and the potential data of each location of the simulated metal water pipe, the potential difference between the simulated grounding network and each location of the simulated metal water pipe is calculated, the contact voltage at each location of the simulated metal water pipe is obtained, and then the contact voltage distribution result of the simulated metal water pipe is obtained.

[0078] Based on the potential data at various locations of the simulated metal water pipe, the potential difference between two adjacent locations is calculated to obtain the step voltage between two adjacent locations of the simulated metal water pipe, and then the contact voltage distribution of the simulated metal water pipe is obtained.

[0079] Step S5: Based on the simulated contact voltage and step voltage of the metal water pipes under various metal water pipe laying scenarios, perform inversion calculations to obtain the actual contact voltage and actual step voltage of the actual substation metal water pipes under different metal water pipe laying scenarios.

[0080] In this embodiment, refer to Figure 5The diagram shows the contact voltage results of the actual grounding grid obtained by inversion calculation under different metal water pipe laying scenarios provided in the embodiments of the present invention. Figure 5 The ground insulation in the above refers to the overhead insulation laying scenario; the inversion calculation based on the simulated contact voltage and step voltage of the metal water pipe under various metal water pipe laying scenarios yields the actual contact voltage and actual step voltage of the actual substation metal water pipe under different metal water pipe laying scenarios, including:

[0081] For each metal water pipe laying scenario, the impedance of the actual grounding grid is calculated based on the soil resistivity of the target substation and the grounding grid area of ​​the actual grounding grid parameters. The actual maximum grounding voltage of the actual grounding grid is calculated based on the impedance of the actual grounding grid and the actual maximum grounding current.

[0082] Based on the soil resistivity of the target substation and the area of ​​the simulated grounding grid, the impedance of the simulated grounding grid is calculated, and based on the impedance of the simulated grounding grid and the test current, the test grounding voltage of the simulated grounding grid is calculated.

[0083] Based on the actual maximum ground voltage of the actual grounding grid and the test ground voltage of the simulated grounding grid, calculate the ground voltage ratio between the actual grounding grid and the simulated grounding grid, and use the ground voltage ratio as the inversion parameter;

[0084] The contact voltage and step voltage of the simulated metal water pipe are multiplied by the inversion parameters to obtain the actual contact voltage and actual step voltage of the actual metal water pipe in the substation.

[0085] In this embodiment, the impedance of the grounding grid is calculated using the following formula:

[0086]

[0087] Where R is the impedance of the grounding grid; ρ is the soil resistivity; and S is the area of ​​the grounding grid.

[0088] Step S6: Based on the actual contact voltage and actual step voltage of the metal water pipes in the actual substation under different metal water pipe laying scenarios, determine the final substation metal pipe laying design scheme.

[0089] In this embodiment, determining the final substation metal pipe laying design scheme based on the actual contact voltage and actual step voltage of the actual substation metal water pipes under different metal pipe laying scenarios includes:

[0090] For each metal water pipe laying scenario, the actual contact voltage of the actual substation metal water pipe is compared with the contact voltage safety threshold, and the actual step voltage of the actual substation metal water pipe is compared with the step voltage safety threshold. Metal water pipe laying scenarios where the actual contact voltage is less than the contact voltage safety threshold and the actual step voltage is less than the step voltage safety threshold are selected as candidate metal water pipe laying scenarios.

[0091] For each candidate metal water pipe laying scenario, the percentage values ​​of actual contact voltage and actual step voltage relative to their respective safety thresholds are calculated. Based on the percentage values ​​of actual contact voltage and actual step voltage relative to their respective safety thresholds, combined with the preset weight values ​​of actual contact voltage and actual step voltage, the comprehensive voltage index of each candidate laying scenario is calculated.

[0092] The candidate laying scenario with the lowest comprehensive voltage index will be used as the final design scheme for laying metal pipelines in the substation.

[0093] Example 2:

[0094] Reference Figure 6 This is a block diagram of a substation metal water pipe laying design device based on experimental simulation, provided by an embodiment of the present invention. To address the problem that existing substation metal water pipe laying design methods mainly rely on human experience, lacking experimental simulation to verify the reliability and effectiveness of the design results, leading to unreasonable substation metal water pipe laying design schemes, this device includes at least the following modules: a data acquisition module, an experimental simulation model construction module, a simulation measurement module, a simulation voltage calculation module, an inversion calculation module, and a laying scheme generation module.

[0095] The data acquisition module is used to acquire the soil, actual maximum ground current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation.

[0096] The experimental simulation model construction module is used to construct experimental simulation models of the target substation under different metal water pipe laying scenarios according to a preset ratio based on the soil, actual maximum grounding current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation; wherein, the experimental simulation model includes a simulated grounding grid and a simulated metal water pipe;

[0097] The simulation measurement module is used to apply test current to the experimental simulation model under different metal water pipe laying scenarios, and to obtain the potential data of the simulated grounding grid and simulated metal water pipe under different metal water pipe laying scenarios.

[0098] The simulated voltage calculation module is used to calculate the contact voltage and step voltage of the simulated metal water pipe in each metal water pipe laying scenario based on the potential data of the simulated grounding grid and the simulated metal water pipe in each metal water pipe laying scenario.

[0099] The inversion calculation module is used to perform inversion calculations based on the contact voltage and step voltage of the simulated metal water pipes under various metal water pipe laying scenarios, so as to obtain the actual contact voltage and actual step voltage of the actual substation metal water pipes under different metal water pipe laying scenarios.

[0100] The laying scheme generation module is used to determine the final laying design scheme for substation metal pipes based on the actual contact voltage and actual step voltage of the actual substation metal pipes under different metal pipe laying scenarios.

[0101] In this embodiment, the step of performing inversion calculations based on the simulated contact voltage and step voltage of metal water pipes under various metal water pipe laying scenarios to obtain the actual contact voltage and actual step voltage of actual substation metal water pipes under different metal water pipe laying scenarios includes:

[0102] For each metal water pipe laying scenario, the impedance of the actual grounding grid is calculated based on the soil resistivity of the target substation and the grounding grid area of ​​the actual grounding grid parameters. The actual maximum grounding voltage of the actual grounding grid is calculated based on the impedance of the actual grounding grid and the actual maximum grounding current.

[0103] Based on the soil resistivity of the target substation and the area of ​​the simulated grounding grid, the impedance of the simulated grounding grid is calculated, and based on the impedance of the simulated grounding grid and the test current, the test grounding voltage of the simulated grounding grid is calculated.

[0104] Based on the actual maximum ground voltage of the actual grounding grid and the test ground voltage of the simulated grounding grid, calculate the ground voltage ratio between the actual grounding grid and the simulated grounding grid, and use the ground voltage ratio as the inversion parameter;

[0105] The contact voltage and step voltage of the simulated metal water pipe are multiplied by the inversion parameters to obtain the actual contact voltage and actual step voltage of the actual metal water pipe in the substation.

[0106] In this embodiment, the impedance of the grounding grid is calculated using the following formula:

[0107]

[0108] Where R is the impedance of the grounding grid; ρ is the soil resistivity; and S is the area of ​​the grounding grid.

[0109] It should be noted that the aforementioned terminal devices may include, but are not limited to, processors and memory. Those skilled in the art will understand that the aforementioned terminal devices are merely examples and do not constitute a limitation on the terminal devices. They may include more or fewer components, or combine certain components, or different components.

[0110] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A design method for laying metal water pipes in substations based on experimental simulation, characterized in that, include: Obtain the soil, actual maximum ground current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation; Based on the soil, actual maximum ground current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation, an experimental simulation model of the target substation under different metal water pipe laying scenarios is constructed according to a preset ratio; wherein, the experimental simulation model includes a simulated grounding grid and a simulated metal water pipe; Test currents were applied to experimental simulation models under different metal water pipe laying scenarios, and potential data of simulated grounding grids and simulated metal water pipes under different metal water pipe laying scenarios were obtained; Based on the potential data of the simulated grounding grid and simulated metal water pipes in each metal water pipe laying scenario, calculate the contact voltage and step voltage of the simulated metal water pipes in each metal water pipe laying scenario. Based on the simulated contact voltage and step voltage of metal water pipes under various metal water pipe laying scenarios, inversion calculations are performed to obtain the actual contact voltage and actual step voltage of actual substation metal water pipes under different metal water pipe laying scenarios. Based on the actual contact voltage and actual step voltage of the metal water pipes in the actual substation under different metal water pipe laying scenarios, the final substation metal pipe laying design scheme is determined.

2. The substation metal water pipe laying design method based on experimental simulation according to claim 1, characterized in that, The different metal water pipe laying scenarios include buried, overhead insulated, and overhead grounded. The experimental simulation model of the target substation under different metal water pipe laying scenarios is constructed according to a preset ratio based on the soil, actual maximum grounding current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation. This includes: Based on the actual grounding grid parameters and actual metal water pipe parameters of the target substation, a simulated grounding grid and simulated metal water pipe are constructed according to a preset ratio, and the simulated grounding grid is buried to a preset depth. Test current is connected to the middle of the simulated grounding grid, and one end of the simulated grounding grid is connected to one end of the simulated metal water pipe. The laying method of the simulated metal water pipe is set to buried, overhead insulation and overhead grounding, so as to obtain an experimental simulation model of the metal water pipe laying scenario as buried, overhead insulation and overhead grounding.

3. The substation metal water pipe laying design method based on experimental simulation according to claim 2, characterized in that, The process of applying test current to the experimental simulation model under different metal water pipe laying scenarios and obtaining potential data of the simulated grounding grid and simulated metal water pipes under different metal water pipe laying scenarios includes: The same test current was applied to the experimental simulation models of buried, overhead insulated, and overhead grounded metal water pipe laying scenarios, and the potential data of the simulated grounding grid and the potential data of different locations of the simulated metal water pipe under different metal water pipe laying scenarios were obtained by using a multimeter at preset distances.

4. The substation metal water pipe laying design method based on experimental simulation according to claim 3, characterized in that, The step of calculating the contact voltage and step voltage of the simulated metal water pipes in each metal water pipe laying scenario, based on the potential data of the simulated grounding grid and simulated metal water pipes, includes: For each metal water pipe laying scenario, based on the potential data of the simulated grounding network and the potential data of each location of the simulated metal water pipe, the potential difference between the simulated grounding network and each location of the simulated metal water pipe is calculated, the contact voltage at each location of the simulated metal water pipe is obtained, and then the contact voltage distribution result of the simulated metal water pipe is obtained. Based on the potential data at various locations of the simulated metal water pipe, the potential difference between two adjacent locations is calculated to obtain the step voltage between two adjacent locations of the simulated metal water pipe, and then the contact voltage distribution of the simulated metal water pipe is obtained.

5. The substation metal water pipe laying design method based on experimental simulation according to claim 4, characterized in that, The method involves inverting calculations based on the simulated contact voltage and step voltage of metal water pipes under various metal water pipe laying scenarios to obtain the actual contact voltage and actual step voltage of actual substation metal water pipes under different metal water pipe laying scenarios, including: For each metal water pipe laying scenario, the impedance of the actual grounding grid is calculated based on the soil resistivity of the target substation and the grounding grid area of ​​the actual grounding grid parameters. The actual maximum grounding voltage of the actual grounding grid is calculated based on the impedance of the actual grounding grid and the actual maximum grounding current. Based on the soil resistivity of the target substation and the area of ​​the simulated grounding grid, the impedance of the simulated grounding grid is calculated, and based on the impedance of the simulated grounding grid and the test current, the test grounding voltage of the simulated grounding grid is calculated. Based on the actual maximum ground voltage of the actual grounding grid and the test ground voltage of the simulated grounding grid, calculate the ground voltage ratio between the actual grounding grid and the simulated grounding grid, and use the ground voltage ratio as the inversion parameter; The contact voltage and step voltage of the simulated metal water pipe are multiplied by the inversion parameters to obtain the actual contact voltage and actual step voltage of the actual metal water pipe in the substation.

6. The substation metal water pipe laying design method based on experimental simulation according to claim 5, characterized in that, The impedance of the grounding grid is calculated using the following formula: Where R is the impedance of the grounding grid; ρ is the soil resistivity; and S is the area of ​​the grounding grid.

7. The substation metal water pipe laying design method based on experimental simulation according to claim 6, characterized in that, The final substation metal pipe laying design scheme is determined based on the actual contact voltage and actual step voltage of the actual substation metal water pipes under different metal pipe laying scenarios, including: For each metal water pipe laying scenario, the actual contact voltage of the actual substation metal water pipe is compared with the contact voltage safety threshold, and the actual step voltage of the actual substation metal water pipe is compared with the step voltage safety threshold. Metal water pipe laying scenarios where the actual contact voltage is less than the contact voltage safety threshold and the actual step voltage is less than the step voltage safety threshold are selected as candidate metal water pipe laying scenarios. For each candidate metal water pipe laying scenario, the percentage values ​​of actual contact voltage and actual step voltage relative to their respective safety thresholds are calculated. Based on the percentage values ​​of actual contact voltage and actual step voltage relative to their respective safety thresholds, combined with the preset weight values ​​of actual contact voltage and actual step voltage, the comprehensive voltage index of each candidate laying scenario is calculated. The candidate laying scenario with the lowest comprehensive voltage index will be used as the final design scheme for laying metal pipelines in the substation.

8. A design device for laying metal water pipes in substations based on experimental simulation, characterized in that, include: The system includes a data acquisition module, an experimental simulation model construction module, a simulation measurement module, a simulation voltage calculation module, an inversion calculation module, and a laying scheme generation module. The data acquisition module is used to acquire the soil, actual maximum ground current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation. The experimental simulation model construction module is used to construct experimental simulation models of the target substation under different metal water pipe laying scenarios according to a preset ratio based on the soil, actual maximum grounding current, actual grounding grid parameters, and actual metal water pipe parameters of the target substation; wherein, the experimental simulation model includes a simulated grounding grid and a simulated metal water pipe; The simulation measurement module is used to apply test current to the experimental simulation model under different metal water pipe laying scenarios, and to obtain the potential data of the simulated grounding grid and simulated metal water pipe under different metal water pipe laying scenarios. The simulated voltage calculation module is used to calculate the contact voltage and step voltage of the simulated metal water pipe in each metal water pipe laying scenario based on the potential data of the simulated grounding grid and the simulated metal water pipe in each metal water pipe laying scenario. The inversion calculation module is used to perform inversion calculations based on the contact voltage and step voltage of the simulated metal water pipes under various metal water pipe laying scenarios, so as to obtain the actual contact voltage and actual step voltage of the actual substation metal water pipes under different metal water pipe laying scenarios. The laying scheme generation module is used to determine the final laying design scheme for substation metal pipes based on the actual contact voltage and actual step voltage of the actual substation metal pipes under different metal pipe laying scenarios.

9. The substation metal water pipe laying design device based on experimental simulation according to claim 8, characterized in that, The method involves inverting calculations based on the simulated contact voltage and step voltage of metal water pipes under various metal water pipe laying scenarios to obtain the actual contact voltage and actual step voltage of actual substation metal water pipes under different metal water pipe laying scenarios, including: For each metal water pipe laying scenario, the impedance of the actual grounding grid is calculated based on the soil resistivity of the target substation and the grounding grid area of ​​the actual grounding grid parameters. The actual maximum grounding voltage of the actual grounding grid is calculated based on the impedance of the actual grounding grid and the actual maximum grounding current. Based on the soil resistivity of the target substation and the area of ​​the simulated grounding grid, the impedance of the simulated grounding grid is calculated, and based on the impedance of the simulated grounding grid and the test current, the test grounding voltage of the simulated grounding grid is calculated. Based on the actual maximum ground voltage of the actual grounding grid and the test ground voltage of the simulated grounding grid, calculate the ground voltage ratio between the actual grounding grid and the simulated grounding grid, and use the ground voltage ratio as the inversion parameter; The contact voltage and step voltage of the simulated metal water pipe are multiplied by the inversion parameters to obtain the actual contact voltage and actual step voltage of the actual metal water pipe in the substation.

10. The substation metal water pipe laying design device based on experimental simulation according to claim 9, characterized in that, The impedance of the grounding grid is calculated using the following formula: Where R is the impedance of the grounding grid; ρ is the soil resistivity; and S is the area of ​​the grounding grid.

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