A grounding device for a power transmission line tower and a design method and system thereof

Abstract

The embodiment of the application discloses a power transmission line tower grounding device and a design method and system thereof, which measures the soil resistivity around the power transmission line tower to determine the grounding resistance limit value of the tower, then determines the side length of the horizontal square frame electrode according to the structural parameters of the tower and the distance between the tower and the horizontal square frame electrode, and finally determines the total length of the horizontal radiation electrode and the number of vertical electrodes according to the side length of the horizontal square frame electrode, the grounding resistance limit value and the soil resistivity, so as to finally determine the structure of the grounding device. According to the design method and system, the length and depth of the horizontal square frame electrode of the power transmission line tower grounding device and the depth of the vertical electrode are not particularly large, and can be constructed by general machinery, so that the cost is effectively reduced, and the grounding resistance of the tower is effectively reduced under the condition of smaller occupied area, so that the back flashover rate of the line is reduced, and the safety performance around the tower is improved.

Description

Technical Field

[0001] This invention relates to the field of power system grounding technology, and in particular to a grounding device for transmission line towers and its design method and system. Background Technology

[0002] Grounding of transmission line towers is a crucial channel for discharging faults and lightning currents, and an important measure to ensure the safe and reliable operation of the power system. With socio-economic development, the demand for electrical energy is gradually increasing, and the scale and density of power grids are expanding. Numerous transmission lines traverse various areas, including towns, farmland, and mountainous regions. Transmission line tower grounding devices generally employ a horizontal radial electrode structure, and the size of the rays gradually increases with soil resistivity, reaching lengths of up to hundreds of meters in areas with high soil resistivity. However, in some areas, due to limitations in land resources or topography, installing large-sized horizontal radial grounding electrodes requires significant financial and material resources, resulting in high land acquisition costs and significant land excavation difficulties.

[0003] Chinese patent CN213460127U discloses a vertical grounding device within the base area of ​​a transmission line tower, in which the vertical grounding electrodes can be spliced ​​together; CN210074184U discloses a deep-well vertical grounding electrode. While these vertical grounding electrodes solve the problem of large footprint of the grounding body on transmission line towers, in areas with high soil resistivity, vertical electrodes tens or even hundreds of meters long are needed to reduce resistance. Due to limitations in machinery and other conditions, construction is difficult and costly, making implementation difficult in some situations. When grounding devices in some cases cannot be designed and modified according to conventional resistance reduction measures, and their grounding resistance fails to meet technical specifications, it can lead to excessively high tower top potential during short-circuit faults or lightning strikes, increasing the voltage across the line insulator strings and increasing the risk of backflashover on the transmission line. Excessive grounding resistance can also cause an increase in ground potential rise near the tower, increasing step voltage and contact voltage, endangering personal safety near the tower during current dissipation. Summary of the Invention

[0004] To address the technical problems in existing technologies where transmission line tower grounding devices rely solely on horizontal radial electrodes or have high installation costs for vertical electrodes, and where grounding resistance easily exceeds standards, increasing the risk of backflashover in transmission lines and even endangering personal safety, embodiments of the present invention provide a transmission line tower grounding device and its design method and system.

[0005] According to one aspect of the present invention, a grounding device for a transmission line tower is provided. The grounding device includes a horizontal square electrode, horizontal ray electrodes, and vertical electrodes. The horizontal square electrode is located at the bottom of the tower and has a side length of k. Four horizontal ray electrodes are arranged extending outward along the diagonal of the square electrode, starting from the four contacts of the horizontal square electrode. Vertical electrodes are arranged at the beginning, end, and at intervals of k of each horizontal ray electrode.

[0006] Optionally, in the above-described embodiment of the grounding device of the present invention, the horizontal square electrode is buried in the ground at a depth of 0.5 meters to 1 meter.

[0007] Optionally, in the above-described grounding device embodiment of the present invention, the length v of each vertical electrode is equal to the side length k of the horizontal square electrode.

[0008] Optionally, in the above-described grounding device embodiment of the present invention, the four horizontal ray electrodes are of equal length, and the total length of a single horizontal ray electrode is l = (n-1)*k, where n is the number of vertical electrodes connected to a single horizontal ray electrode.

[0009] According to another aspect of the present invention, a design method for a grounding device for a transmission line tower is provided, the method comprising:

[0010] Measure the soil resistivity ρ around the transmission line tower where the grounding device is to be installed;

[0011] The grounding resistance limit R0 of the transmission line tower is determined according to the pre-set soil resistivity-grounding resistance correspondence table and the soil resistivity ρ.

[0012] The side length k of the horizontal square electrode is determined based on the distance D1 between the horizontal square electrode and the outer edge of the transmission line tower foundation, the root opening D2 of the transmission line tower foundation, and the maximum horizontal dimension D3 of the tower foundation.

[0013] The number of vertical electrodes n connected to each horizontal ray electrode is determined based on the soil resistivity ρ, the side length of the box k, and the grounding resistance limit R0.

[0014] The total length l of the horizontal ray electrode and the length v of the vertical electrode are determined based on the side length k of the box and the number of vertical electrodes n.

[0015] Optionally, in the above-described method embodiments of the present invention, the side length k of the horizontal square electrode is determined based on the distance D1 between the horizontal square electrode and the outer edge of the transmission line tower foundation, the foundation root opening D2 of the transmission line tower, and the maximum horizontal dimension D3 of the tower foundation. The calculation formula is as follows:

[0016] k = (D1 + D2 / 2 + D3 / 2) * 2

[0017] In the formula, D1∈[D min D max ], D min and D max These are the lower and upper limits of the distance between the pre-set horizontal square electrode and the outer edge of the transmission line tower foundation, respectively.

[0018] Optionally, in the above-described method embodiments of the present invention, determining the number of vertical electrodes n connected to each horizontal ray electrode based on the soil resistivity ρ, the side length k of the box, and the grounding resistance limit R0 includes:

[0019] Let the grounding resistance of the transmission line tower be R, and its calculation formula is as follows:

[0020] R = 0.2626335 * k -0.9109 *N 0.7736 *ρ

[0021] Based on the soil resistivity ρ and the side length k of the box, calculate the minimum N value of the grounding resistance R that satisfies R≤R0, where N is a natural number.

[0022] The minimum N value is taken as the number n of vertical electrodes connected to each horizontal ray electrode.

[0023] Optionally, in the above-described method embodiments of the present invention, the total length l of the horizontal ray electrode and the length v of the vertical electrode are determined based on the side length k of the box and the number of vertical electrodes n, and the calculation formula is as follows:

[0024] v = k

[0025] l = (n-1)*k.

[0026] According to another aspect of the present invention, a design system for a grounding device for a transmission line tower is provided, the system comprising:

[0027] The data measurement module is used to measure the soil resistivity ρ around the transmission line tower where the grounding device is to be installed;

[0028] The first calculation module is used to determine the grounding resistance limit R0 of the transmission line tower according to the pre-set soil resistivity-grounding resistance correspondence table and the soil resistivity ρ.

[0029] The second calculation module is used to determine the square side length k of the horizontal square electrode based on the distance D1 between the horizontal square electrode and the outer edge of the transmission line tower foundation, the foundation root opening D2 of the transmission line tower, and the maximum horizontal dimension D3 of the tower foundation.

[0030] The third calculation module is used to determine the number of vertical electrodes n connected to each horizontal ray electrode based on the soil resistivity ρ, the side length of the box k and the grounding resistance limit R0.

[0031] The fourth calculation module is used to determine the total length l of the horizontal ray electrode and the length v of the vertical electrode based on the side length k of the box and the number of vertical electrodes n.

[0032] Optionally, in the above-described system embodiments of the present invention, the second calculation module determines the side length k of the horizontal square electrode based on the distance D1 between the horizontal square electrode and the outer edge of the transmission line tower foundation, the foundation root opening D2 of the transmission line tower, and the maximum horizontal dimension D3 of the tower foundation. The calculation formula is as follows:

[0033] k = (D1 + D2 / 2 + D3 / 2) * 2

[0034] In the formula, D1∈[D min D max ], D min and D max These are the lower and upper limits of the distance between the pre-set horizontal square electrode and the outer edge of the transmission line tower foundation, respectively.

[0035] Optionally, in the above-described system embodiments of the present invention, the third calculation module determines the number n of vertical electrodes connected to each horizontal ray electrode based on the soil resistivity ρ, the side length k of the box, and the grounding resistance limit R0, including:

[0036] Let the grounding resistance of the transmission line tower be R, and its calculation formula is as follows:

[0037] R = 0.2626335 * k -0.9109 *N 0.7736 *ρ

[0038] Based on the soil resistivity ρ and the side length k of the box, calculate the minimum N value of the grounding resistance R that satisfies R≤R0, where N is a natural number.

[0039] The minimum N value is taken as the number n of vertical electrodes connected to each horizontal ray electrode.

[0040] Optionally, in the above system embodiments of the present invention, the fourth calculation module determines the total length l of the horizontal ray electrode and the length v of the vertical electrode based on the side length k of the box and the number of vertical electrodes n, and the calculation formula is as follows:

[0041] v = k

[0042] l = (n-1)*k.

[0043] The transmission line tower grounding device and its design method and system provided in the above embodiments of the present invention determine the grounding resistance limit of the tower by measuring the soil resistivity around the tower. Then, based on the tower's structural parameters and its distance from the horizontal square electrode, the side length of the horizontal square electrode is determined. Finally, based on the side length of the horizontal square electrode, the grounding resistance limit, and the soil resistivity, the total length of the horizontal radial electrodes and the number of vertical electrodes are determined, thus ultimately determining the structure of the grounding device. The length of the horizontal square electrode and the depth of both the horizontal square electrode and the vertical electrode determined by the design method and system described in this embodiment are not particularly large, and can generally be implemented using conventional machinery, effectively reducing costs. Furthermore, the structure of the grounding device, which incorporates horizontal square electrodes, horizontal radial electrodes, and vertical electrodes, effectively reduces the tower's grounding resistance with a smaller footprint, thereby reducing the backflashover rate of the line and improving the safety performance around the tower.

[0044] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0045] The above and other objects, features, and advantages of the present invention will become more apparent from the more detailed description of the embodiments of the invention in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same parts or steps.

[0046] Figure 1 This is a schematic diagram of the structure of a transmission line tower grounding device provided in an exemplary embodiment of the present invention;

[0047] Figure 2 This is a flowchart illustrating a design method for a grounding device for transmission line towers provided in an exemplary embodiment of the present invention.

[0048] Figure 3 This is a side view of the structure of a transmission line tower and grounding device provided in an exemplary embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of a grounding device determined according to the design method of a grounding device for a transmission line tower, provided in an exemplary embodiment of the present invention;

[0050] Figure 5 This is a schematic diagram of the design system of the grounding device for transmission line towers provided in an exemplary embodiment of the present invention. Detailed Implementation

[0051] Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments of the present invention. It should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0052] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0053] Those skilled in the art will understand that the terms "first," "second," etc., in the embodiments of the present invention are only used to distinguish different steps, devices, or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0054] It should also be understood that in the embodiments of the present invention, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0055] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more unless explicitly defined or given contrary instructions in the context.

[0056] Furthermore, the term "and / or" in this invention is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this invention generally indicates that the preceding and following related objects have an "or" relationship.

[0057] It should also be understood that the description of the various embodiments in this invention emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0058] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0059] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0060] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0061] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0062] The embodiments of this invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate together with a wide range of other general-purpose or special-purpose computing system environments or configurations. Well-known examples of terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments including any of the above systems, etc.

[0063] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments, where tasks are executed by remote processing devices linked through communication networks. In distributed cloud computing environments, program modules can reside on local or remote computing system storage media, including storage devices.

[0064] Exemplary device

[0065] Figure 1 This is a schematic diagram of the structure of a transmission line tower grounding device provided in an exemplary embodiment of the present invention. Figure 1 As shown, the grounding device of this preferred embodiment includes a horizontal square electrode 101, a horizontal ray electrode 102, and a vertical electrode 103. The horizontal square electrode is located at the bottom of the tower and has a side length of k. Starting from the four contacts of the horizontal square electrode, four horizontal ray electrodes are arranged outward along the diagonal of the square. Vertical electrodes are arranged at the beginning, end, and at intervals of k of each horizontal ray electrode.

[0066] Preferably, the horizontal square electrode is buried in the ground at a depth of 0.5 meters to 1 meter.

[0067] Preferably, the length v of each vertical electrode is equal to the side length k of the horizontal square electrode. Setting the ratio of the spacing to the length of the vertical electrodes to 1:1 ensures that the depth of the vertical electrodes is not excessively large, allowing for installation with general machinery, while also maintaining sufficient spacing to avoid excessive shielding effects that could affect the effective utilization rate of the electrodes, thus improving economic efficiency.

[0068] Preferably, the four horizontal ray electrodes are of equal length, and the total length of a single horizontal ray electrode is l = (n-1)*k, where n is the number of vertical electrodes connected to a single horizontal ray electrode.

[0069] Exemplary methods

[0070] Figure 2 This is a schematic flowchart illustrating a design method for a grounding device for transmission line towers according to an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as... Figure 2 As shown, it includes the following steps:

[0071] Step 201: Measure the soil resistivity ρ around the transmission line tower where the grounding device is to be installed.

[0072] In one embodiment, the soil resistivity ρ around tower A, which has a lightning protection wire, on a 220kV transmission line where a grounding device is to be installed, is measured using the four-pole method. The foundation of tower A is a cavitation-type foundation, and the measured soil resistivity ρ near tower A is approximately 1500 Ω·m.

[0073] Step 202: Determine the grounding resistance limit R0 of the transmission line tower according to the pre-set soil resistivity-grounding resistance correspondence table and the soil resistivity ρ.

[0074] In one embodiment, the soil resistivity-grounding resistance correspondence table is set according to the requirements of current technical standards. The current standard is the "Code for Grounding Design of AC Electrical Installations" (GB50065-2011), which states that the power frequency grounding impedance of line towers with lightning protection wires should not exceed the values ​​listed in Table 1 during the dry season. Therefore, Table 1 is an embodiment of the soil resistivity-grounding resistance correspondence table described herein.

[0075] Table 1 Power Frequency Grounding Impedance of Line Towers with Lightning Protection Wires

[0076]

[0077] As shown in Table 1, when the soil resistivity ρ near tower a is about 1500 Ω·m, the grounding resistance limit R0 should not be greater than 25 Ω.

[0078] Step 203: Determine the side length k of the horizontal square electrode based on the distance D1 between the horizontal square electrode and the outer edge of the transmission line tower foundation, the root opening D2 of the transmission line tower foundation, and the maximum horizontal dimension D3 of the tower foundation.

[0079] Preferably, the side length k of the horizontal square electrode is determined based on the distance D1 between the horizontal square electrode and the outer edge of the transmission line tower foundation, the foundation root opening D2 of the transmission line tower, and the maximum horizontal dimension D3 of the tower foundation. The calculation formula is as follows:

[0080] k = (D1 + D2 / 2 + D3 / 2) * 2

[0081] In the formula, D1∈[D min D max ], D min and D max These are the lower and upper limits of the distance between the pre-set horizontal square electrode and the outer edge of the transmission line tower foundation, respectively.

[0082] Figure 3 This is a side view of the structure of a transmission line tower and grounding device provided in an exemplary embodiment of the present invention. Figure 3 As shown, the grounding device includes a horizontal square electrode 101, horizontal ray electrodes 102, and vertical electrodes 103. The side length of the horizontal square electrode 101 is k. Four horizontal ray electrodes 102 are arranged extending outwards along the diagonal of the square electrode 101, starting from its four contacts. Vertical electrodes 103 are arranged at the beginning, end, and at intervals of k along the beginning and end of each horizontal ray electrode 102. The distance between the horizontal square electrode 101 and the outer edge of the transmission line tower foundation is D1. The foundation root width of the transmission line tower is D2, and the maximum horizontal dimension of the tower foundation is D3.

[0083] In one embodiment, measurements show that the main column diameter of tower A is 1.2m, the base plate diameter is 2.4m, and the foundation root width is 8m. When the horizontal square electrode is arranged with its frame side length 1m from the outer edge of the foundation, the formula for calculating the frame side length of the horizontal square electrode yields a value of (8 / 2 + 2.4 / 2 + 1) * 2 = 12.4m. The lower and upper limits of the distance between the horizontal square and the outer edge of the foundation of tower A are 0.5m and 3m, respectively.

[0084] Step 204: Determine the number of vertical electrodes n connected to each horizontal ray electrode based on the soil resistivity ρ, the side length k of the box, and the grounding resistance limit R0.

[0085] Preferably, the number of vertical electrodes n connected to each horizontal ray electrode is determined based on the soil resistivity ρ, the side length k of the frame, and the grounding resistance limit R0, including:

[0086] Let the grounding resistance of the transmission line tower be R, and its calculation formula is as follows:

[0087] R = 0.2626335 * k-0.9109 *N 0.7736 *ρ

[0088] Based on the soil resistivity ρ and the side length k of the box, calculate the minimum N value of the grounding resistance R that satisfies R≤R0, where N is a natural number.

[0089] The minimum N value is taken as the number n of vertical electrodes connected to each horizontal ray electrode.

[0090] In one embodiment, when the side length k of the frame is known to be 12.4 m, the soil resistivity ρ to be 1500 Ω·m, and R0 to be 25 ohms, the grounding resistance is calculated using the formula R = 0.2626335 * k. -0.9109 *N 0.7736 *ρ shows that when N equals 1, R = 39.8Ω > R0 = 25Ω, while when N equals 2, R = 23.2Ω < R0 = 25Ω. According to the above calculation, the minimum value of N is 2. Therefore, the number of vertical electrodes n connected to each horizontal ray electrode is equal to 2.

[0091] Step 205: Determine the total length l of the horizontal ray electrode and the length v of the vertical electrode based on the side length k of the box and the number of vertical electrodes n.

[0092] Preferably, the total length l of the horizontal ray electrodes and the length v of the vertical electrodes are determined based on the side length k of the frame and the number of vertical electrodes n, and the calculation formula is as follows:

[0093] v = k

[0094] l = (n-1)*k.

[0095] In one embodiment, given that k equals 12.4m and n equals 2, according to the formula for determining the total length of each horizontal ray electrode and the length of the vertical electrode, the total length l of the horizontal ray electrode is equal to 12.4m and the length v of the vertical electrode is also equal to 12.4m.

[0096] Figure 4 This is a schematic diagram of the structure of a grounding device determined according to the design method of a grounding device for transmission line towers, provided by an exemplary embodiment of the present invention. Figure 4 According to the calculation results of the above embodiment, the total length of each horizontal ray electrode, the side length of the horizontal square electrode and the length of the vertical electrode are both 12.4m. Each horizontal ray electrode has a vertical electrode installed at both the beginning and the end, and the total number of vertical electrodes is 2*4=8.

[0097] The design method for the grounding device of transmission line towers provided in this embodiment offers a grounding device solution for areas with limited space, while taking into account the reliability and technical and economic feasibility of the grounding device, thus fully realizing the safe and stable operation of transmission lines under the premise of low cost.

[0098] Exemplary System

[0099] Figure 5 This is a schematic diagram of the design system of a grounding device for transmission line towers provided in an exemplary embodiment of the present invention. Figure 5 As shown, the design system for the transmission line tower grounding device in this embodiment includes:

[0100] Data measurement module 501 is used to measure the soil resistivity ρ around the transmission line tower where the grounding device is to be installed;

[0101] The first calculation module 502 is used to determine the grounding resistance limit R0 of the transmission line tower according to the pre-set soil resistivity-grounding resistance correspondence table and the soil resistivity ρ.

[0102] The second calculation module 503 is used to determine the square side length k of the horizontal square electrode based on the distance D1 between the horizontal square electrode and the outer edge of the transmission line tower foundation, the foundation root opening D2 of the transmission line tower, and the maximum dimension D3 of the tower foundation in the horizontal direction.

[0103] The third calculation module 505 is used to determine the number of vertical electrodes n connected to each horizontal ray electrode based on the soil resistivity ρ, the side length of the box k and the grounding resistance limit R0.

[0104] The fourth calculation module 505 is used to determine the total length l of the horizontal ray electrode and the length v of the vertical electrode based on the side length k of the box and the number of vertical electrodes n.

[0105] Preferably, the second calculation module 503 determines the side length k of the horizontal square electrode based on the distance D1 between the horizontal square electrode and the outer edge of the transmission line tower foundation, the foundation root opening D2 of the transmission line tower, and the maximum horizontal dimension D3 of the tower foundation. The calculation formula is as follows:

[0106] k = (D1 + D2 / 2 + D3 / 2) * 2

[0107] In the formula, D1∈[D min D max ], D min and D max These are the lower and upper limits of the distance between the pre-set horizontal square electrode and the outer edge of the transmission line tower foundation, respectively.

[0108] Preferably, the third calculation module 505 determines the number of vertical electrodes n connected to each horizontal ray electrode based on the soil resistivity ρ, the side length k of the box, and the grounding resistance limit R0, including:

[0109] Let the grounding resistance of the transmission line tower be R, and its calculation formula is as follows:

[0110] R = 0.2626335 * k -0.9109 *N 0.7736 *ρ

[0111] Based on the soil resistivity ρ and the side length k of the box, calculate the minimum N value of the grounding resistance R that satisfies R≤R0, where N is a natural number.

[0112] The minimum N value is taken as the number n of vertical electrodes connected to each horizontal ray electrode.

[0113] Preferably, the fourth calculation module 505 determines the total length l of the horizontal ray electrodes and the length v of the vertical electrodes based on the side length k of the box and the number of vertical electrodes n, and the calculation formula is as follows:

[0114] v = k

[0115] l = (n-1)*k.

[0116] The design system for the grounding device of transmission line towers provided in this embodiment measures the soil resistivity around the transmission line tower to determine the limit value of the grounding resistance, and then determines the structural parameters of the grounding device based on the tower structure, soil resistivity, and the limit value of the grounding resistance. The steps are the same as those of the design method for the grounding device of transmission line towers provided in this embodiment, and the technical effects achieved are also the same, so they will not be repeated here.

[0117] In addition to the methods and systems described above, embodiments of this disclosure may also be computer program products comprising computer program instructions that, when executed by a processor, cause the processor to perform the steps in the electrochemical energy storage power station modeling method for dynamic simulation of large power grids according to various embodiments of this disclosure as described in the "Exemplary Methods" section above.

[0118] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this disclosure. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on a user's computing device, partially on a user's computing device, as a standalone software package, partially on a user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0119] Furthermore, embodiments of this disclosure may also be computer-readable storage media storing computer program instructions that, when executed by a processor, cause the processor to perform the steps in the electrochemical energy storage power station modeling method for dynamic simulation of large power grids according to various embodiments of this disclosure as described in the "Exemplary Methods" section above.

[0120] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may, for example, include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0121] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0122] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0123] The block diagrams of devices, apparatuses, devices, and systems disclosed herein are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0124] The methods and apparatus of this disclosure may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of this disclosure are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, this disclosure may also be implemented as a program recorded on a recording medium, the program including machine-readable instructions for implementing the methods according to this disclosure. Thus, this disclosure also covers recording media storing programs for performing the methods according to this disclosure.

[0125] It should also be noted that in the apparatus, devices, and methods of this disclosure, the components or steps are decomposable and / or recombinable. Such decomposition and / or recombination should be considered equivalent to the present disclosure. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0126] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A method of designing a ground device for a power transmission line tower, the method comprising: determining a ground device design based on a ground device design parameter; and determining a ground device design parameter based on a ground device design parameter value. The method includes: Measuring soil resistivity around a power transmission line tower to be installed with grounding devices The grounding device comprises horizontal square frame electrodes, horizontal ray electrodes and vertical electrodes. The horizontal square frame electrodes are located at the bottom of the tower with a side length of ; four horizontal ray electrodes are arranged outward along the diagonal direction of the square frame from the four contact points of the horizontal square frame electrodes; vertical electrodes are arranged at the first end, the last end and the positions with an interval length of ​ According to a preset soil resistivity-grounding resistance corresponding relation table and the soil resistivity Determining the grounding resistance limit value of the power transmission line tower ; Based on the distance between the horizontal square electrode and the outer edge of the transmission line tower foundation. The foundation root of the transmission line tower The maximum horizontal dimension of the tower foundation Determine the side length of the horizontal square electrode. The calculation formula is as follows: In the formula, [ , ], and These are the lower and upper limits of the distance between the pre-set horizontal square electrode and the outer edge of the transmission line tower foundation, respectively; Based on the soil resistivity , side length of the box and the grounding resistance limit Determine the number of vertical electrodes connected to each horizontal ray electrode. ,include: Let the grounding resistance of the transmission line tower be The calculation formula is as follows: Based on the soil resistivity and the side length of the box Calculate the grounding resistance satisfy The smallest Value, of which, It is a natural number; Based on the side length of the rectangle and the number of vertical electrodes Determine the total length of each horizontal ray electrode and vertical electrode length .

2. The method according to claim 1, characterized in that, Based on the side length of the rectangle and the number of vertical electrodes Determine the total length of each horizontal ray electrode and vertical electrode length The calculation formula is as follows: 。 3. The method according to claim 1, characterized in that, The method also includes setting the depth of the horizontal square electrode buried in the ground to be 0.5 meters to 1 meter.

4. A design system for a grounding device for transmission line towers, characterized in that, The system includes: The data measurement module is used to measure the soil resistivity around the transmission line tower where the grounding device is to be installed. The grounding device includes a horizontal square electrode, a horizontal ray electrode, and a vertical electrode. The horizontal square electrode is located at the bottom of the tower and has a side length of . Starting from the four contacts of the horizontal square electrode, four horizontal ray electrodes are arranged outward along the diagonal of the square. Vertical electrodes are arranged at the beginning, end, and at intervals of in each horizontal ray electrode. The first calculation module is used to calculate the soil resistivity-grounding resistance correspondence table and the soil resistivity based on the pre-set soil resistivity-grounding resistance correspondence table. Determine the grounding resistance limit of the transmission line tower. ; The second calculation module is used to calculate the distance between the horizontal square electrode and the outer edge of the transmission line tower foundation. The foundation root of the transmission line tower The maximum horizontal dimension of the tower foundation Determine the side length of the horizontal square electrode. The calculation formula is as follows: In the formula, [ , ], and These are the lower and upper limits of the distance between the pre-set horizontal square electrode and the outer edge of the transmission line tower foundation, respectively; The third calculation module is used to calculate based on the soil resistivity. , side length of the box and the grounding resistance limit Determine the number of vertical electrodes connected to each horizontal ray electrode. ,include: Let the grounding resistance of the transmission line tower be The calculation formula is as follows: Based on the soil resistivity and the side length of the box Calculate the grounding resistance satisfy The smallest Value, of which, It is a natural number; The fourth calculation module is used to calculate based on the side length of the rectangle. and the number of vertical electrodes Determine the total length of each horizontal ray electrode and vertical electrode length .

5. The system according to claim 4, characterized in that, The fourth calculation module is based on the side length of the box. and the number of vertical electrodes Determine the total length of each horizontal ray electrode and vertical electrode length The calculation formula is as follows: 。 6. The system according to claim 4, characterized in that, The system is also used to set the depth of the horizontal square electrode buried in the ground to be 0.5 meters to 1 meter.

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