Differentiated lightning protection grounding evaluation method, system and equipment for transformer substation and storage medium

Abstract

The invention discloses a transformer substation differentiated lightning protection grounding evaluation method, system and device and a storage medium. The method comprises the following steps: performing grid division on a region with a lightning protection insulation demand of a transformer substation; obtaining thunder and lightning meteorological data of the transformer substation and the soil resistivity of each grid; acquiring an equipment grounding mode of each grid; and setting weight factors according to the importance of the grid area, the soil resistivity and the equipment grounding mode, calculating to obtain the score of each grid, and judging the lightning protection grounding level of each grid according to the score. Lightning stroke risk points can be identified more accurately, and effective protection measures are taken, so that the lightning protection effect is improved.

Description

Technical Field

[0001] The present invention belongs to the field of lightning protection technology and relates to a method, system, equipment and storage medium for evaluating differentiated lightning protection grounding in a substation. Background Art

[0002] With the rapid development of power systems and the expansion of grids, the threat posed by lightning strikes to power transmission and distribution equipment is becoming increasingly severe. Traditional lightning protection and grounding measures, such as standardized grounding resistance standards, lightning rods, and lightning conductors, while able to mitigate damage to equipment to a certain extent, face numerous shortcomings. These traditional measures often fail to provide targeted protection based on factors such as regional lightning activity, equipment type, and criticality, resulting in poor lightning protection effectiveness and even a waste of resources.

[0003] Previous research on lightning protection and grounding has the following major issues. 1) Lack of Targetedness and Flexibility: Traditional lightning protection and grounding technologies often employ uniform standards and measures, failing to tailor protection to factors such as regional lightning activity, equipment type, and criticality. This "one-size-fits-all" approach results in poor lightning protection effectiveness and may even waste resources. 2) Inadequate Technical Evaluation and Monitoring Methods: Existing technologies are relatively inadequate for evaluating and monitoring lightning protection effectiveness, making it impossible to promptly identify and resolve issues with lightning protection and grounding measures. This can lead to inability to guarantee the effectiveness of lightning protection measures, impacting the safe and stable operation of the entire power system. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a substation differentiated lightning protection grounding assessment method, system, equipment and storage medium, which can accurately assess the lightning protection weak points in the power system.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A differentiated lightning protection and grounding assessment method for a substation includes the following steps: S1, grid division of the substation area with lightning protection and insulation requirements; S2, obtains lightning meteorological data of the substation and soil resistivity of each grid; S3, obtain the grounding mode of the equipment in each grid; S4 sets weight factors for the grid area, soil resistivity, and equipment grounding method according to their importance, calculates the score of each grid, and determines the lightning protection grounding level of each grid based on the score.

[0006] Preferably, in S2, resistivity measurement is performed by sampling according to a five-point method, and the average value is taken as the soil resistivity within the grid.

[0007] Preferably, in S2, the soil resistivity in each grid is measured at fixed points multiple times in one year to form a historical database.

[0008] Preferably, in S3, the equipment grounding method includes a grounding electrode, a grounding wire, a grounding grid, a lightning rod and a lightning conductor.

[0009] Preferably, in S4, the grounding level is divided into four levels: normal state, caution state, abnormal state and severe state.

[0010] Preferably, for normal conditions, check the grounding measures and do not perform additional lightning protection grounding modifications; for caution conditions, perform aging checks on existing grounding measures, replace old grounding devices or perform rust removal and refurbishment on existing devices, and do not perform additional lightning protection grounding modifications; for abnormal conditions, first check whether the existing grounding devices are installed correctly, and then perform lightning protection grounding modifications; for serious conditions, first determine whether there are effective grounding measures in the grid, then check the correctness of the installation method of the existing grounding devices, and finally determine whether new reliable lightning protection grounding measures are needed.

[0011] Preferably, the grid transformation method including towers includes: using resistance reducing agents, deeply burying grounding bodies, replacing grounding body materials, increasing the number and distribution of grounding bodies, adding grounding wires, and adding vertical grounding modules; Methods for grid modification involving transformers include: installing lightning rods and arresters, adopting multi-point grounding, and using a common grounding device; The modification methods for lightning rods and lightning arresters include: adding lightning arresters to grids that do not already contain lightning arresters, using dual redundant design protection for important equipment, modifying existing lightning arresters by changing their positions, and replacing them with arresters with better parameters.

[0012] A differentiated lightning protection and grounding assessment system for a substation, comprising: Grid division module, used to divide the substation into grids with lightning protection and insulation requirements; Soil resistivity acquisition module, used to obtain lightning meteorological data of the substation and the soil resistivity of each grid; Equipment grounding mode acquisition module, used to obtain the equipment grounding mode of each grid; The score calculation module is used to set weight factors based on the importance of grid area, soil resistivity and equipment grounding method, calculate the score of each grid, and judge the lightning protection grounding level of each grid based on the score.

[0013] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for evaluating differentiated lightning protection and grounding of a substation are implemented.

[0014] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the substation differentiated lightning protection and grounding assessment method.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention contributes to the work related to lightning protection transformation, improves the lightning resistance level of substations, and reduces the damage of lightning intrusion waves to electrical equipment in the station. The method mainly relies on dividing the outdoor part of the substation into grids according to the area, evaluating the lightning meteorological data of the substation, the soil conditions within the grid, and the electrical grounding effect, and giving corresponding grounding transformation suggestions based on the evaluation results. It can more accurately identify lightning risk points and take effective protective measures to improve the lightning protection effect. And through differentiated lightning protection grounding technology, resources can be reasonably allocated according to actual needs. For areas with frequent lightning activities and high equipment importance, more stringent lightning protection measures can be taken; for areas with less lightning activities and less important equipment, relatively simple lightning protection measures can be taken. This helps to enhance the stability and reliability of the power system and ensure the safety and stability of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a flow chart of the differentiated lightning protection and grounding assessment method for substations of the present invention; Figure 2 Schematic diagram of the five-point soil sampling method of the present invention. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms "installed", "connected", and "connected" should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected, electrically connected, or able to communicate with each other; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internally connected between two elements or an interactive relationship between two elements. The term "and / or" used herein includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The terms used herein 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.

[0020] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0021] like Figure 1 The figure shows the differentiated lightning protection and grounding assessment method for substations according to the present invention, which includes the following steps: Step 1: Meshing Determine the outdoor area of ​​the substation where important electrical equipment and other areas requiring lightning protection and insulation are located. This outdoor area is divided into 1m*1m grids. The grid area can be appropriately reduced if higher lightning protection requirements are required. Also, collect lightning meteorological data for the substation area, including lightning-related parameters such as lightning days, thunderstorm hours, and ground lightning density.

[0022] Step 2: Soil resistivity measurement like Figure 2 As shown, bare soil resistivity is measured using a five-point sampling method, and the average value is used to represent the soil resistivity within that grid. Soil resistivity measurements are taken at fixed points throughout the year to create a historical database. This allows for seasonal and humidity-related variations in soil resistivity, supporting lightning protection and grounding assessments for power systems.

[0023] Step 3: Statistics of grounding methods within the grid Collect statistics on the grounding methods of all devices in the grid, including: 1) Grounding electrode: A metal conductor buried in the ground and in direct contact with the earth, with a grounding function.

[0024] 2) Grounding (down) wire: A metal conductor between the part where the electrical equipment should be grounded and the underground grounding electrode.

[0025] 3) Grounding grid: A horizontal mesh grounding device consisting of vertical and horizontal grounding electrodes.

[0026] 4) Lightning rod: A lightning rod is installed on the top of the protected object and connected to the underground leakage ground network with a standard wire.

[0027] 5) Lightning conductor: A wire installed to guide lightning into the ground to avoid lightning strikes.

[0028] Step 4: Risk Assessment The overall substation grounding level evaluation is divided into four levels: normal state, caution state, abnormal state, and serious state.

[0029]

[0030] The grid area, lightning meteorological data, resistivity and equipment grounding method are weighted according to their importance. The parameters are set to X1, X2, ...Xn respectively. The final grade result of each grid can be expressed by the insulation level evaluation expression y as follows:

[0031] Furthermore, the overall score determines the substation's lightning protection and grounding level, categorizing it into four levels: normal, caution, abnormal, and severe. A severe score indicates a significant lightning strike insulation risk within the grid, necessitating proactive action to improve insulation levels within the grid. Insulation retrofits should be performed using the following methods.

[0032] Step 5: Insulation modification Lightning protection and grounding modification measures: Based on the assessment results and the differences in insulation risk levels, different corrective measures are formulated. For normal conditions, the grounding measures are checked and no additional lightning protection and grounding modification is required; for caution conditions, the original grounding measures can be checked for aging, and old grounding devices can be replaced or the original devices can be refurbished, and generally no additional lightning protection and grounding modification is required; for abnormal conditions, first check whether the original grounding device is installed correctly, and then consider lightning protection and grounding modification; for serious conditions, first check whether there are effective grounding measures in the grid, then check the correctness of the installation method of the original grounding device, and finally consider adding reliable lightning protection and grounding measures.

[0033] Among them, the following methods can be used to improve the grid including towers: using resistance-reducing agents, deeply burying grounding electrodes, changing grounding electrode materials, increasing the number and distribution of grounding electrodes, adding grounding wires, and adding vertical grounding modules.

[0034] Among them, the following transformation methods exist for the grids containing transformers: installing lightning rods and arresters, adopting multi-point grounding, and using common grounding devices.

[0035] Among them, the modification methods for lightning rods and lightning arresters include: adding lightning arresters to grids that do not already have them, using dual-redundancy design to protect important equipment, and modifying existing lightning arresters by changing their locations. Furthermore, lightning arresters with better parameters can be replaced to achieve the desired lightning protection effect.

[0036] Step 6: Regular Evaluation For power systems that have undergone lightning protection and grounding assessments and retrofits, regular assessments should be conducted after a period of lightning activity, based on the performance of the retrofitted grounding system. This will test the effectiveness of the lightning protection and grounding system and further enhance the lightning resistance of the lines. This will promptly identify any significant shortcomings in the system and further improve system stability.

[0037] Through the above steps, differentiated lightning protection and grounding are implemented in substations, allowing targeted lightning protection measures to be developed based on factors such as location, equipment type, and criticality. This technology can more accurately identify lightning strike risk points and implement effective protective measures, thereby improving lightning protection effectiveness. Furthermore, differentiated lightning protection and grounding technology can be used to rationally allocate resources based on actual needs. More stringent lightning protection measures can be implemented in areas with frequent lightning activity and high-criticality equipment, while relatively simpler lightning protection measures can be implemented in areas with less lightning activity and less critical equipment. This helps enhance the stability and reliability of the power system and ensure a secure and stable power supply.

[0038] The following are device embodiments of the present invention, which can be used to perform the method embodiments of the present invention. For details not disclosed in the device embodiments, please refer to the method embodiments of the present invention.

[0039] In another embodiment of the present invention, a differentiated lightning protection and grounding assessment system for a substation is provided. The differentiated lightning protection and grounding assessment system for a substation can be used to implement the above-mentioned differentiated lightning protection and grounding assessment method for a substation. Specifically, the differentiated lightning protection and grounding assessment system for a substation includes a grid division module, a soil resistivity acquisition module, an equipment grounding method acquisition module, and a score calculation module.

[0040] Among them, the grid division module is used to divide the substation into grids with lightning protection and insulation requirements.

[0041] The soil resistivity acquisition module is used to obtain the lightning meteorological data of the substation and the soil resistivity of each grid.

[0042] The equipment grounding mode acquisition module is used to obtain the equipment grounding mode of each grid.

[0043] The score calculation module is used to set weight factors based on the importance of grid area, soil resistivity and equipment grounding method, calculate the score of each grid, and judge the lightning protection grounding level of each grid based on the score.

[0044] In yet another embodiment of the present invention, a terminal device is provided. The terminal device includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions to implement corresponding method processes or corresponding functions. The processor described in the embodiment of the present invention can be used for the operation of a differentiated lightning protection and grounding assessment method for a substation, including: S1, gridding the substation area with lightning protection insulation requirements; S2, obtaining lightning meteorological data of the substation and the soil resistivity of each grid; S3, obtaining the equipment grounding method of each grid; S4, setting weight factors for the grid area, soil resistivity, and equipment grounding method according to their importance, calculating a score for each grid, and judging the lightning protection and grounding level of each grid based on the score.

[0045] In another embodiment, the present invention further provides a computer-readable storage medium (Memory), which is a memory device in a terminal device for storing programs and data. It is understood that the computer-readable storage medium herein may include both built-in storage media in the terminal device and, of course, extended storage media supported by the terminal device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, the storage space also stores one or more instructions suitable for being loaded and executed by a processor. These instructions may be one or more computer programs (including program code). It should be noted that the computer-readable storage medium herein may be a high-speed RAM memory or a non-volatile memory, such as at least one disk storage device.

[0046] One or more instructions stored in a computer-readable storage medium can be loaded and executed by a processor to implement the corresponding steps of the differentiated lightning protection and grounding assessment method for substations in the above-mentioned embodiment; one or more instructions in the computer-readable storage medium are loaded by the processor and execute the following steps: S1, gridding the substation area with lightning protection insulation requirements; S2, obtaining the lightning meteorological data of the substation and the soil resistivity of each grid; S3, obtaining the equipment grounding method of each grid; S4, setting weight factors for the grid area, soil resistivity and equipment grounding method according to their importance, calculating the score of each grid, and judging the lightning protection and grounding level of each grid based on the score.

[0047] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0048] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0049] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0050] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0051] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0052] In the above embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0053] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0054] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0055] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

[0056] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of completeness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the preceding claims is not a disclaimer of such subject matter, nor should it be considered that the applicants did not consider such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A method for evaluating differentiated lightning protection and grounding of a substation, characterized in that: The process includes: S1, grid division of the substation area with lightning protection and insulation requirements; S2, obtains lightning meteorological data of the substation and soil resistivity of each grid; S3, obtaining the grounding mode of the equipment in each grid; S4, weight factors are set according to the importance of the grid area, soil resistivity and equipment grounding method, and the score of each grid is calculated. The lightning protection grounding level of each grid is determined based on the score.

2. The method for evaluating differentiated lightning protection and grounding of a substation according to claim 1, characterized in that: In S2, samples are taken according to the five-point method for resistivity measurement, and the average value is taken as the soil resistivity in the grid.

3. The method for evaluating differentiated lightning protection and grounding of a substation according to claim 1, characterized in that: In S2, the soil resistivity in each grid is measured at fixed points several times throughout the year to form a historical database.

4. The method for evaluating differentiated lightning protection and grounding of a substation according to claim 1, characterized in that: In S3, equipment grounding methods include grounding electrodes, grounding wires, grounding grids, lightning rods, and lightning conductors.

5. The method for evaluating differentiated lightning protection and grounding of a substation according to claim 1, characterized in that: In S4, the grounding level is divided into four levels: normal state, caution state, abnormal state and severe state.

6. The method for evaluating differentiated lightning protection and grounding of a substation according to claim 1, characterized in that: For normal conditions, check the grounding measures and do not perform additional lightning protection grounding modifications; for caution conditions, check the aging of the original grounding measures, replace the old grounding devices or remove rust and refurbish the original devices, and do not perform additional lightning protection grounding modifications; for abnormal conditions, first check whether the original grounding devices are installed correctly, and then perform lightning protection grounding modifications; for serious conditions, first determine whether there are effective grounding measures in the grid, then check the correctness of the installation method of the original grounding devices, and finally determine whether new reliable lightning protection grounding measures are needed.

7. The method for evaluating differentiated lightning protection and grounding of a substation according to claim 1, characterized in that: The grid transformation methods including towers include: using resistance reducing agents, deeply burying grounding electrodes, replacing grounding electrode materials, increasing the number and distribution of grounding electrodes, adding grounding wires, and adding vertical grounding modules; Methods for grid transformation including transformers include: installing lightning rods and arresters, adopting multi-point grounding, and using common grounding devices; The modification methods for lightning rods and lightning arresters include: adding lightning arresters to grids that do not contain lightning arresters themselves, using dual redundant design protection for important equipment, modifying the original lightning arresters by changing their positions, and replacing them with lightning arresters with better parameters.

8. A differentiated lightning protection and grounding assessment system for a substation, characterized in that: include: A grid division module is used to divide the grid into areas with lightning protection and insulation requirements in the substation; Soil resistivity acquisition module, used to obtain lightning meteorological data of the substation and soil resistivity of each grid; Equipment grounding mode acquisition module, used to obtain the equipment grounding mode of each grid; The score calculation module is used to set weight factors according to the importance of the grid area, soil resistivity and equipment grounding method, calculate the score of each grid, and judge the lightning protection grounding level of each grid according to the score.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the differentiated lightning protection and grounding assessment method for a substation are implemented as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the differentiated lightning protection and grounding assessment method for a substation as claimed in any one of claims 1 to 7 are implemented.

Images