PLP installation height selection method for lightning protection of long-span power transmission line

Abstract

The invention relates to the technical field of power system protection, in particular to a PLP installation height selection method for lightning protection of a long-span power transmission line. The method comprises the following steps: obtaining the height difference between the height of a lead on a cross arm and the top of a tower, the sag height of the lead and the distance between two PLPs; calculating a conductor sag radius according to the conductor sag height and the spacing, and calculating a PLP protection radius between the two PLPs according to the spacing; and when the sag radius of the lead is greater than the protection radius of the PLP, calculating the installation height of the PLP according to the height difference, the sag height of the lead and the spacing. The objective of the invention is to solve the problem of how to improve the calculation precision of the lightning protection range of the PLP.

Description

Technical Field

[0001] The present application relates to the technical field of power system protection, and in particular to a method for selecting a PLP installation height for lightning protection of large-span transmission lines. Background Art

[0002] Large spans generally refer to ultra-high / ultra-high voltage power lines passing through large rivers, lakes or straits, with a span of more than 1000m or a tower height of more than 100m. The conductor selection or tower design requires special consideration, and in the event of a failure, the tension section seriously affects shipping or is particularly difficult to repair.

[0003] Among the relevant technical solutions, a new type of lightning protection device has been proposed - Plasma Lightning Protector (PLP), which has a good effect in lightning protection. It uses the "tip-like effect" to make its own electric field strength under the thundercloud two orders of magnitude higher than the protected object, and attracts the thundercloud charge, so that the protected target is in a safe position with a relatively low electric field. It also adopts an induction array anti-lightning rod and a dielectric barrier strong ionization composite discharger, and uses the thundercloud electric field to achieve passive strong ionization. The strong ionization discharger generates and radiates high-concentration plasma in both directions from cloud to ground, and efficiently neutralizes the thundercloud charge attracted by the anti-lightning rod, solving the fatal problem that the electric field self-shielding effect of the traditional lightning arrester array needle suppresses the increase of divergent current and is easily struck by lightning.

[0004] PLP installed on the tower can effectively resist lightning and will not cause induced lightning overvoltage. It is a new means of lightning protection. When selecting the installation height of PLP, the formula of protection radius equal to 10 times the installation height is usually applied to solve it. However, the inventor found in the process of conceiving and realizing this application that for large-span power lines with ultra-long spans, the lines will be affected by gravity and sag will occur, so that the actual lightning protection range of PLP will have a large error with the theoretically calculated lightning protection range when PLP is set according to the traditional height setting method, and it may not be able to completely cover the large-span power lines. For this reason, this application proposes a method for selecting the installation height of PLP for lightning protection of large-span transmission lines to improve the calculation accuracy of the lightning protection range of PLP.

[0005] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0006] The main purpose of this application is to provide a method for selecting the PLP installation height for lightning protection of large-span transmission lines, aiming to solve the problem of how to improve the calculation accuracy of the lightning protection range of the PLP.

[0007] To achieve the above-mentioned purpose, the present application provides a method for selecting the installation height of a PLP for lightning protection of a large-span transmission line, which is applied to a lightning protection field with a span of more than 1000m or a tower height of more than 100m, wherein the lightning protection field includes at least two PLPs of equal height, and the method includes the following steps:

[0008] Obtain the height difference between the conductor height on the cross arm and the top of the tower, the conductor sag height, and the spacing between the two PLPs;

[0009] Calculating a conductor sag radius according to the conductor sag height and the spacing, and calculating a PLP protection radius between two PLPs according to the spacing;

[0010] When the conductor sag radius is greater than the PLP protection radius, the installation height of the PLP is calculated according to the height difference, the conductor sag height and the spacing.

[0011] Optionally, the calculation expression of the installation height is:

[0012]

[0013] In the formula, is the installation height of PLP, L is the conductor sag height, D is the distance between two towers, is the height difference between the height of the conductor on the cross arm and the top of the tower, and p is the correction factor for the installation height of the PLP device.

[0014] Optionally, the value of the correction coefficient is associated with the installation height of the PLP, and the calculation expression of the correction coefficient is:

[0015] when hour, ;

[0016] when ≥ hour, .

[0017] Optionally, after the steps of calculating the conductor sag radius according to the conductor sag height and the spacing, and calculating the PLP protection radius between two PLPs according to the spacing, the method further includes:

[0018] When the conductor sag radius is smaller than the PLP protection radius, any height is used as the installation height of the PLP device.

[0019] Optionally, the calculation expression of the conductor sag radius is:

[0020]

[0021] In the formula, is the conductor sag radius, L is the conductor sag height, and D is the distance between the two towers.

[0022] Optionally, the calculation expression of the PLP protection radius is:

[0023]

[0024] In the formula, is the conductor sag radius, and D is the distance between the two towers.

[0025] This application has at least the following beneficial effects:

[0026] 1. Taking into account the influence of conductor sag, the minimum height of the entire line that PLP can protect is given, making lightning protection of large-span power lines more economical and reliable;

[0027] 2. It is suitable for towers with different spans and can meet the lightning protection requirements of power lines in most cases. It makes up for the defect of insufficient radius accuracy of the traditional method of directly applying the formula. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the architecture of the hardware operating environment of the PLP installation height selection system involved in the embodiment of the present application;

[0029] Figure 2 This is a flow chart of the first embodiment of the method for selecting the PLP installation height for lightning protection of large-span transmission lines of the present application;

[0030] Figure 3 This is a schematic diagram of the position relationship in the lightning protection of a long-span transmission line when the conductor sag radius is greater than the PLP protection radius involved in the first embodiment of the present application;

[0031] Figure 4 This is a schematic diagram of the position relationship in the lightning protection of a long-span transmission line when the conductor sag radius is greater than the PLP protection radius involved in the second embodiment of the present application;

[0032] Figure 5 This is a flow chart of a second embodiment of the method for selecting the PLP installation height for lightning protection of large-span transmission lines of the present application;

[0033] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] In order to better understand the above technical solution, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] As an implementation plan, Figure 1 This is a schematic diagram of the architecture of the hardware operating environment of the PLP installation height selection system involved in the embodiment of the present application.

[0036] like Figure 1 As shown, the PLP installation height selection system may include: a processor 1001, such as a CPU, a memory 1005, a user interface 1003, a network interface 1004, and a communication bus 1002. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0037] Those skilled in the art will understand that Figure 1 The PLP installation height selection system architecture shown in the figure does not constitute a limitation on the PLP installation height selection system, and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0038] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a PLP installation height selection program for lightning protection of large-span transmission lines. Among them, the operating system is a program for managing and controlling the hardware and software resources of the PLP installation height selection system, the operation of the PLP installation height selection program for lightning protection of large-span transmission lines, and other software or programs.

[0039] exist Figure 1In the PLP installation height selection system shown, the user interface 1003 is mainly used to connect to the terminal and communicate data with the terminal; the network interface 1004 is mainly used for the background server and communicates data with the background server; the processor 1001 can be used to call the PLP installation height selection program for lightning protection of large-span transmission lines stored in the memory 1005.

[0040] In this embodiment, the PLP installation height selection system includes: a memory 1005, a processor 1001, and a PLP installation height selection program for lightning protection of large-span transmission lines stored in the memory and executable on the processor, wherein:

[0041] When the processor 1001 calls the PLP installation height selection program for lightning protection of large-span transmission lines stored in the memory 1005, the following operations are performed:

[0042] When the processor 1001 calls the PLP installation height selection program for lightning protection of large-span transmission lines stored in the memory 1005, the following operations are performed:

[0043] Obtain the height difference between the conductor height on the cross arm and the top of the tower, the conductor sag height, and the spacing between the two PLPs;

[0044] Calculating a conductor sag radius according to the conductor sag height and the spacing, and calculating a PLP protection radius between two PLPs according to the spacing;

[0045] When the conductor sag radius is greater than the PLP protection radius, the installation height of the PLP is calculated according to the height difference, the conductor sag height and the spacing.

[0046] When the processor 1001 calls the PLP installation height selection program for lightning protection of large-span transmission lines stored in the memory 1005, the following operations are performed:

[0047] The calculation expression of the installation height is:

[0048]

[0049] In the formula, is the installation height of PLP, L is the conductor sag height, D is the distance between two towers, is the height difference between the height of the conductor on the cross arm and the top of the tower, and p is the correction factor for the installation height of the PLP device.

[0050] When the processor 1001 calls the PLP installation height selection program for lightning protection of large-span transmission lines stored in the memory 1005, the following operations are performed:

[0051] when hour, ;

[0052] when ≥ hour, .

[0053] When the processor 1001 calls the PLP installation height selection program for lightning protection of large-span transmission lines stored in the memory 1005, the following operations are performed:

[0054] When the conductor sag radius is smaller than the PLP protection radius, any height is used as the installation height of the PLP device.

[0055] When the processor 1001 calls the PLP installation height selection program for lightning protection of large-span transmission lines stored in the memory 1005, the following operations are performed:

[0056] The calculation expression of the conductor sag radius is:

[0057]

[0058] In the formula, is the conductor sag radius, L is the conductor sag height, and D is the distance between the two towers.

[0059] When the processor 1001 calls the PLP installation height selection program for lightning protection of large-span transmission lines stored in the memory 1005, the following operations are performed:

[0060] The calculation expression of the PLP protection radius is:

[0061]

[0062] In the formula, is the conductor sag radius, and D is the distance between the two towers.

[0063] Based on the hardware architecture of the PLP installation height selection system of the above-mentioned power system protection technology, an embodiment of the present application is proposed of a PLP installation height selection method for lightning protection of large-span transmission lines.

[0064] First embodiment

[0065] Reference Figure 2 In the first embodiment, the method for selecting the PLP installation height for lightning protection of a large-span transmission line comprises the following steps:

[0066] Step S10, obtaining the height difference between the height of the conductor on the cross arm and the top of the tower, the conductor sag height, and the distance between the two PLPs;

[0067] In this step, the height difference between the height of the conductor on the crossarm and the top of the tower, the conductor sag height and the distance between the two PLPs are first obtained, and substituted into the subsequent formula for calculation, where the height between the two PLPs is the same.

[0068] It should be noted that the above-mentioned height difference, conductor sag height and the distance between the two PLPs are all measured values.

[0069] When measuring the height difference between the conductor height on the crossarm and the top of the tower, the size of the hardware, such as the height of the insulator, needs to be taken into account.

[0070] It should be noted that the conductor sag height refers to the height between the lowest point of the conductor and the horizontal plane of the tower crossarm.

[0071] Step S20, calculating the conductor sag radius according to the conductor sag height and the spacing, and calculating the PLP protection radius between two PLPs according to the spacing;

[0072] In this step, after obtaining the above parameters, the conductor sag radius is calculated according to the obtained conductor sag height and the spacing.

[0073] When calculating the sag radius of the conductor, the conductor sag is regarded as a segment of an arc, and the conductor sag radius is calculated by a geometric method. Specifically and optionally, the calculation expression of the conductor sag radius is:

[0074]

[0075] In the formula, is the conductor sag radius, L is the conductor sag height, and D is the distance between the two towers.

[0076] And, according to the collected spacing between the two PLPs, a PLP protection radius between the two PLPs is calculated. Specifically and optionally, the calculation expression of the PLP protection radius is:

[0077]

[0078] In the formula, is the conductor sag radius, and D is the distance between the two towers.

[0079] Step S30, when the conductor sag radius is greater than the PLP protection radius, calculating the installation height of the PLP according to the height difference, the conductor sag height and the spacing.

[0080] In this step, after the conductor sag radius and the PLP protection radius are obtained, the size relationship between the two is determined.

[0081] Reference Figure 3The figure shows the positional relationship in the lightning protection of large-span transmission lines when the conductor sag radius is larger than the PLP protection radius. When the conductor sag radius is larger than the PLP protection radius, it means that the installation height of the PLP device is lower than the conductor. In order to protect the entire length of the conductor, it is necessary to raise the installation position of the PLP on the tower to expand its protection range. Therefore, the installation height of the PLP is calculated based on the height difference, conductor sag height and spacing.

[0082] Specifically and optionally, the calculation expression of the installation height is:

[0083]

[0084] In the formula, is the installation height of PLP, L is the conductor sag height, D is the distance between two towers, is the height difference between the height of the conductor on the cross arm and the top of the tower, and p is the correction factor for the installation height of the PLP device.

[0085] Furthermore, the value of the correction coefficient is associated with the installation height of the PLP, and the calculation expression of the correction coefficient is:

[0086] when hour, ;

[0087] when ≥ hour, .

[0088] It should be noted that when calculating the PLP protection radius, the installation height of the PLP is The value should not be greater than 30m, that is, in most cases, .

[0089] In the technical solution provided in this embodiment, by obtaining the height difference between the height of the conductor on the cross arm and the top of the tower, the conductor sag height and the spacing between the two PLPs, the PLP protection radius and the conductor sag radius between the two PLPs are calculated based on these three parameters. When it is judged that the conductor sag radius is greater than the PLP protection radius, the appropriate installation height of the PLP is calculated based on these three parameters. Taking into account the influence of the conductor sag, the minimum height that the PLP can protect the entire length of the line is given, making the lightning protection of large-span power lines more economical and accurate.

[0090] Second embodiment

[0091] Based on the first embodiment, when the conductor sag radius is smaller than the PLP protection radius, refer to Figure 4The diagram shows the position relationship in the lightning protection of long-span transmission lines when the conductor sag radius is larger than the PLP protection radius. It can be seen that when the conductor sag radius is smaller than the PLP protection radius, even if the PLP is installed at the tower top at a height of 0m, it can still provide full coverage protection for the conductors between the tower tops. Figure 5 , after step S20, further comprising:

[0092] Step S40: when the conductor sag radius is smaller than the PLP protection radius, an arbitrary height is used as the installation height of the PLP device.

[0093] Third embodiment

[0094] Based on the first embodiment, as an optional implementation, in this embodiment, it is assumed that the height difference between the obtained height of the conductor on the cross arm and the height of the top of the tower is , conductor sag height , the distance between the two towers .

[0095] Substituting into formula (1), the sag radius of the conductor is calculated as:

[0096]

[0097] Substituting into formula (2), the PLP protection radius is calculated as:

[0098]

[0099] judge , then calculate the installation height of PLP according to formula (4):

[0100]

[0101] That is, the installation height of the PLP device on the tower must at least meet When the power is on, it can meet the requirements of protecting the entire line.

[0102] Fourth embodiment

[0103] Based on the first embodiment, as an optional implementation, in this embodiment, it is assumed that the height difference between the obtained height of the conductor on the cross arm and the height of the top of the tower is , conductor sag height , the distance between the two towers .

[0104] Substituting into formula (1), the sag radius of the conductor is calculated as:

[0105]

[0106] Substituting into formula (2), the PLP protection radius is calculated as:

[0107]

[0108] judge , then calculate the installation height of PLP according to formula (4):

[0109]

[0110] That is, the installation height of the PLP device on the tower must at least meet When the power is on, it can meet the requirements of protecting the entire line.

[0111] In addition, it can be understood by those skilled in the art that all or part of the processes in the method for implementing the above embodiment can be completed by instructing the relevant hardware through a computer program. The computer program includes program instructions, and the computer program can be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the PLP installation height selection system to implement the process steps of the embodiment of the above method.

[0112] Therefore, the present application also provides a computer-readable storage medium, which stores a PLP installation height selection program for lightning protection of large-span transmission lines. When the PLP installation height selection program for lightning protection of large-span transmission lines is executed by a processor, it implements the various steps of the PLP installation height selection method for lightning protection of large-span transmission lines described in the above embodiment.

[0113] The computer-readable storage medium may be a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disk, etc., which are computer-readable storage media that can store program codes.

[0114] It should be noted that since the storage medium provided in the embodiment of the present application is the storage medium used to implement the method of the embodiment of the present application, based on the method introduced in the embodiment of the present application, the person skilled in the art can understand the specific structure and deformation of the storage medium, so it is not repeated here. All storage media used in the method of the embodiment of the present application belong to the scope of protection of this application.

[0115] 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 a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, 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 disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0116] 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 box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes 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.

[0117] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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 A function specified in one or more boxes.

[0118] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0119] It should be noted that in the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claim. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The present application may be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0120] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0121] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for selecting the PLP installation height for lightning protection of large-span transmission lines, characterized in that: Applicable to a lightning protection field with a span of more than 1000m or a tower height of more than 100m, the lightning protection field includes at least two PLPs of equal height, and the method includes the following steps: Obtain the height difference between the conductor height on the cross arm and the top of the tower, the conductor sag height, and the spacing between the two PLPs; Calculating a conductor sag radius according to the conductor sag height and the spacing, and calculating a PLP protection radius between two PLPs according to the spacing; When the conductor sag radius is greater than the PLP protection radius, the installation height of the PLP is calculated according to the height difference, the conductor sag height and the spacing.

2. The method according to claim 1, characterized in that The calculation expression of the installation height is: ； In the formula, is the installation height of PLP, L is the conductor sag height, D is the distance between two towers, is the height difference between the height of the conductor on the crossarm and the top of the tower, and p is the correction factor for the installation height of the PLP device.

3. The method according to claim 2, characterized in that The value of the correction coefficient is associated with the installation height of the PLP, and the calculation expression of the correction coefficient is: when hour, ; when ≥ hour, .

4. The method according to claim 1, characterized in that After the steps of calculating the conductor sag radius according to the conductor sag height and the spacing, and calculating the PLP protection radius between two PLPs according to the spacing, the method further includes: When the conductor sag radius is less than or equal to the PLP protection radius, any height is used as the installation height of the PLP device.

5. The method according to claim 1, characterized in that The calculation expression of the conductor sag radius is: ； In the formula, is the conductor sag radius, L is the conductor sag height, and D is the distance between the two towers.

6. The method according to claim 1, characterized in that The calculation expression of the PLP protection radius is: ； In the formula, is the conductor sag radius, and D is the distance between the two towers.

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