A method for selecting the PLP installation height for lightning protection of large-span transmission lines in plateau and mountainous areas

Abstract

The present application relates to the field of power system protection technology, and in particular to a method for selecting the installation height of PLP for lightning protection of large-span transmission lines in plateaus and mountains. The method includes: measuring the tower height difference between the two towers, the height difference between the height of the conductor on the crossarm and the top of the tower, the conductor sag height, and the horizontal tower spacing between the two towers; calculating the arc segment protection radius of the PLP device according to the tower height difference and the horizontal tower spacing; calculating the curvature at the lowest point of the sag in the geometric equation of the overhead conductor, wherein the geometric equation takes the lowest point of the sag as the coordinate origin, the direction from the lower tower to the higher tower as the positive direction of the X-axis, and the vertically upward direction as the positive direction of the Y-axis; when the curvature is less than the inverse of the arc segment protection radius, the installation height of the PLP on the tower is calculated according to the horizontal tower spacing, the height difference, and the conductor sag height. It aims to solve the problem of how to calculate the selection of non-equal-height PLP installation heights in large-span transmission lines in plateaus and mountains.

Description

Technical Field

[0001] The present application relates to the technical field of power system protection, and in particular to a method for selecting the PLP installation height for lightning protection of large-span transmission lines in plateau mountainous areas. 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 long-span power lines in plateaus and mountains 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 the PLP is set according to the traditional height setting method, and it may not be able to completely cover the long-span power lines. For this reason, this application proposes a non-uniform PLP installation height selection method for lightning protection of long-span transmission lines in plateaus and mountains 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 in plateaus and mountains, aiming to solve the problem of how to calculate the selection of non-uniform PLP installation heights in large-span transmission lines in plateaus and mountains.

[0007] To achieve the above-mentioned purpose, the present application provides a method for selecting the PLP installation height for lightning protection of large-span transmission lines in plateau and mountainous areas, which is applied 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 pole towers of non-equal heights, and the tops of the pole towers are both provided with PLP devices. The method includes the following steps:

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

[0009] Calculate the arc segment protection radius of the PLP device according to the tower height difference and the horizontal tower spacing;

[0010] Calculate the curvature at the lowest point of the sag in the geometric equation of the overhead conductor, wherein the geometric equation takes the lowest point of the sag as the coordinate origin, the direction from the lower tower to the higher tower as the positive direction of the X axis, and the vertically upward direction as the positive direction of the Y axis;

[0011] When the curvature is less than the inverse of the arc segment protection radius, the installation height of the PLP on the tower is calculated according to the horizontal tower spacing, the height difference and the conductor sag height.

[0012] Optionally, the calculation expression of the arc segment protection radius is:

[0013]

[0014] In the formula, is the arc protection radius, D is the conductor sag height and the horizontal tower spacing between the two towers, is the height difference between the two towers.

[0015] Optionally, the geometric equation is expressed as:

[0016]

[0017]

[0018] in, is the specific load when the conductor has the maximum sag, is the stress at maximum sag, and X is the horizontal distance between the lowest point of the sag and the higher tower.

[0019] Optionally, the step of calculating the curvature at the lowest point of the sag in the overhead conductor geometric equation comprises:

[0020] Determine the curvature expression in the overhead conductor geometry equation:

[0021]

[0022] When it is at the lowest point of the sag, x=0, and the curvature at the lowest point of the sag in the geometric equation of the overhead conductor is solved:

[0023] .

[0024] Optionally, the calculation expression for the installation height of the PLP on the tower is:

[0025]

[0026] In the formula, is the installation height of PLP on the tower, D is the conductor sag height and the horizontal tower spacing between the two towers, is the height difference between the height of the conductor on the crossarm and the top of the tower, L is the conductor sag height, and p is the correction factor.

[0027] 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:

[0028] when hour, ;

[0029] when ≥ hour, .

[0030] Optionally, after the step of calculating the curvature at the lowest point of the sag in the overhead conductor geometric equation, the method further comprises:

[0031] When the curvature is greater than or equal to the inverse of the arc segment protection radius, any height is used as the installation height of the PLP device.

[0032] In addition, to achieve the above-mentioned purpose, the present application also provides a PLP device, which includes: a base, a needle holder and an array lightning rod; wherein the installation height of the PLP device is an installation height obtained by the PLP installation height selection method for lightning protection of large-span transmission lines in plateaus and mountains as described in any of the above items.

[0033] This application has at least the following beneficial effects:

[0034] 1. Taking into account the influence of plateau mountain terrain, the minimum height of PLP installed on the tower is calculated, which can protect the entire length of the line while reducing investment;

[0035] 2. It is suitable for towers with different terrains and height differences, and is universal in the protection of power lines in plateaus and mountains. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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;

[0037] Figure 2 This is a schematic diagram of the position of the PLP device set on non-uniform height towers in the long-span transmission line lightning protection scenario involved in the first embodiment of the present application;

[0038] Figure 3 This is a flow chart of a first embodiment of a method for selecting the PLP installation height for lightning protection of a large-span transmission line in a plateau mountainous area according to the present application;

[0039] Figure 4 A schematic diagram of the measurement position of the height difference between the height of the conductor on the cross arm and the top of the tower and the conductor sag height involved in the first embodiment of the present application;

[0040] Figure 5 The calculated installation height involved in the first embodiment of the present application is and the schematic diagram of the location of the overhead conductor geometry equation y;

[0041] Figure 6 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 in plateaus and mountains in this application;

[0042] Figure 7 This is a schematic diagram of the position of a PLP device set on a non-uniform height tower in a lightning protection scenario for a large-span transmission line involved in the third embodiment of the present application.

[0043] 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

[0044] 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.

[0045] 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.

[0046] like Figure 1As 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.

[0047] 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.

[0048] 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 in plateaus and mountains. 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 in plateaus and mountains, and other software or programs.

[0049] exist Figure 1 In 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 in plateau mountains stored in the memory 1005.

[0050] 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 in plateaus and mountains, which is stored in the memory and can be run on the processor, wherein:

[0051] When the processor 1001 calls the PLP installation height selection program for lightning protection of large-span transmission lines in plateau and mountainous areas stored in the memory 1005, the following operations are performed:

[0052] Measure the height difference between the two towers, the height difference between the conductor height on the cross arm and the top of the tower, the conductor sag height and the horizontal tower spacing between the two towers;

[0053] Calculate the arc segment protection radius of the PLP device according to the tower height difference and the horizontal tower spacing;

[0054] Calculate the curvature at the lowest point of the sag in the geometric equation of the overhead conductor, wherein the geometric equation takes the lowest point of the sag as the coordinate origin, the direction from the lower tower to the higher tower as the positive direction of the X axis, and the vertically upward direction as the positive direction of the Y axis;

[0055] When the curvature is less than the inverse of the arc segment protection radius, the installation height of the PLP on the tower is calculated according to the horizontal tower spacing, the height difference and the conductor sag height.

[0056] When the processor 1001 calls the PLP installation height selection program for lightning protection of large-span transmission lines in plateau and mountainous areas stored in the memory 1005, the following operations are performed:

[0057] Determine the curvature expression in the overhead conductor geometry equation:

[0058]

[0059] When it is at the lowest point of the sag, x=0, and the curvature at the lowest point of the sag in the geometric equation of the overhead conductor is solved:

[0060]

[0061] When the processor 1001 calls the PLP installation height selection program for lightning protection of large-span transmission lines in plateau and mountainous areas stored in the memory 1005, the following operations are performed:

[0062] When the curvature is greater than or equal to the inverse of the arc segment protection radius, any height is used as the installation height of the PLP device.

[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 PLP installation height selection method for lightning protection of large-span transmission lines in plateau and mountainous areas of the present application is proposed.

[0064] First embodiment

[0065] Reference Figure 2 The schematic diagram of the location of the PLP device set on non-uniform towers in the lightning protection scenario of a large-span transmission line is shown in FIG. The horizontal tower spacing between the two towers is D, and the height difference between the two towers is The protection range between two PLPs is divided into a circular segment (D' in the figure) and a straight line segment (10 in the figure). part), the protection angle is , arc protection radius of the PLP device .

[0066] Reference Figure 3 In the first embodiment, the method for selecting the PLP installation height for lightning protection of large-span transmission lines in plateau and mountainous areas comprises the following steps:

[0067] Step S10, measuring the tower height difference between the two towers, 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 horizontal tower spacing between the two towers;

[0068] In this embodiment, the height difference between the two towers is first measured. , the height difference J between the height of the conductor on the crossarm and the top of the tower, the conductor sag height L and the horizontal tower spacing D between the two towers.

[0069] For example, the height difference between the height of the conductor on the cross arm and the top of the tower and the measurement position of the conductor sag height are referred to as Figure 4 A schematic diagram showing the height difference between the conductor on the cross arm and the top of the tower and the measurement position of the conductor sag height.

[0070] Step S20, calculating the arc segment protection radius of the PLP device according to the tower height difference and the horizontal tower spacing;

[0071] In this embodiment, after the measurement is completed, the tower height difference in the measured parameters is selected. and the horizontal tower spacing D, calculate the arc protection radius of the PLP device.

[0072] Optionally, the calculation expression of the arc segment protection radius is:

[0073]

[0074] In the formula, is the arc protection radius, D is the conductor sag height and the horizontal tower spacing between the two towers, is the height difference between the two towers.

[0075] Step S30, calculating the curvature at the lowest point of the sag in the geometric equation of the overhead conductor, wherein the geometric equation takes the lowest point of the sag as the coordinate origin, the direction from the lower tower to the higher tower as the positive direction of the X-axis, and the vertically upward direction as the positive direction of the Y-axis;

[0076] In this embodiment, after the arc segment protection radius is calculated, the curvature at the lowest point of the sag in the overhead conductor geometric equation is calculated.

[0077] Among them, the geometric equation of the overhead wire is to consider the sag, the coordinate origin is selected at the lowest point of the sag, the horizontal direction between the two towers is the X-axis, and the vertical direction is the Y-axis. Optionally, the geometric equation of the overhead wire is expressed as follows:

[0078]

[0079]

[0080] in, is the specific load when the conductor has the maximum sag, is the stress at maximum sag, and X is the horizontal distance between the lowest point of the sag and the higher tower.

[0081] It should be noted that the above expression is a derived expression, and the above derivation process is exemplified below:

[0082] First, the original expression of the overhead conductor geometry equation is a hyperbolic cosine function, which is expressed as follows:

[0083]

[0084] Where ch is the hyperbolic cosine function.

[0085] Then expand the above formula into a hyperbolic cosine series and simplify the first three terms to get the following expression:

[0086]

[0087] make , and finally get:

[0088]

[0089] After obtaining the above formula, calculate the curvature k (x=0) at the lowest point of the sag (x=0) in the overhead conductor geometric equation y.

[0090] Specifically, the curvature expression k of the overhead conductor geometric equation y is as follows:

[0091]

[0092] When it is at the lowest point of the sag, x=0, and the curvature at the lowest point of the sag in the geometric equation of the overhead conductor is solved:

[0093]

[0094] Step S40: When the curvature is less than the inverse of the arc segment protection radius, the installation height of the PLP on the tower is calculated according to the horizontal tower spacing, the height difference and the conductor sag height.

[0095] In this embodiment, the calculated curvature at the lowest point of the sag is , the inverse of the arc protection radius (i.e. the curvature of the arc segment of the PLP device) for comparison.

[0096] when When the curvature at the lowest point of the sag is less than the inverse of the protection radius of the arc segment, the line can be protected to the maximum extent when the lowest point of the arc segment in the PLP protection range coincides with the lowest point of the conductor sag. The installation height of the PLP on the pole tower is calculated based on the horizontal tower spacing, height difference and conductor sag height.

[0097] Optionally, the calculation expression for the installation height is as follows:

[0098]

[0099] In the formula, is the installation height of PLP on the tower, D is the conductor sag height and the horizontal tower spacing between the two towers, is the height difference between the height of the conductor on the crossarm and the top of the tower, L is the conductor sag height, and p is the correction factor.

[0100] Further and 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:

[0101] when hour, ;

[0102] when ≥ hour, .

[0103] 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, .

[0104] For example, the calculated installation height and the setting position of the overhead conductor geometry equation y Figure 5 .

[0105] In the technical solution provided in this embodiment, the influence of plateau mountain terrain is taken into account, and the minimum installation height of the PLP installed on two pole towers at different heights is calculated, which fully protects the entire length of the circuit on the high tower while reducing the investment.

[0106] Second embodiment

[0107] Based on the first embodiment, when the curvature at the lowest point of the sag in the geometric equation of the overhead conductor is greater than or equal to the inverse of the arc segment protection radius, that is, the arc segment of the PLP protection range is relatively flat, and the installation position of the PLP is higher than the conductor, the PLP installed on the top of the tower can also protect the entire length of the line. Therefore, referring to Figure 6 , after step S30, further comprising:

[0108] Step S50: When the curvature is greater than or equal to the inverse of the arc segment protection radius, an arbitrary height is used as the installation height of the PLP device.

[0109] Third embodiment

[0110] Reference Figure 7 Based on the first embodiment, in this embodiment, the height difference between the two towers is , the height difference between the conductor on the cross arm and the top of the tower , conductor sag height Horizontal distance between two towers , specific load when the conductor has maximum sag , stress at maximum sag .

[0111] First, substitute into formula (1) to calculate the arc protection radius of the PLP device: ,get:

[0112]

[0113] At the same time, .

[0114] Substituting into equation (2) and equation (3), we get the geometric equation y of the overhead conductor:

[0115]

[0116]

[0117] Furthermore, the curvature at the lowest point of the sag in the overhead conductor geometric equation is calculated according to formula (4): .

[0118] Compare k and ,have to:

[0119]

[0120] Therefore, the installation height is calculated according to formula (5): :

[0121]

[0122] Finally, it is concluded that when the PLP device is installed at a height of 2m on the tower, it can meet the requirements of protecting the entire line.

[0123] 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.

[0124] 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 in plateaus and mountains. When the PLP installation height selection program for lightning protection of large-span transmission lines in plateaus and mountains 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 in plateaus and mountains as described in the above embodiment.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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 installation height of a plasma lightning arrester for lightning protection of a large-span transmission line in a plateau mountainous area, characterized in that: The method 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 comprises at least two pole towers of unequal heights, and a plasma lightning arrester device is arranged on the top of each pole tower. The method comprises the following steps: Measure the height difference between the two towers, the height difference between the conductor height on the cross arm and the top of the tower, the conductor sag height and the horizontal tower spacing between the two towers; Calculate the arc segment protection radius of the plasma lightning arrester device according to the tower height difference and the horizontal tower spacing; Calculate the curvature at the lowest point of the sag in the geometric equation of the overhead conductor, wherein the geometric equation takes the lowest point of the sag as the coordinate origin, the direction from the lower tower to the higher tower as the positive direction of the X axis, and the vertically upward direction as the positive direction of the Y axis; When the curvature is less than the inverse of the arc segment protection radius, the installation height of the plasma lightning arrester on the tower is calculated according to the horizontal tower spacing, the height difference and the conductor sag height.

2. The method according to claim 1, characterized in that The calculation expression of the arc segment protection radius is: ； In the formula, is the arc protection radius, D is the conductor sag height and the horizontal tower spacing between the two towers, is the height difference between the two towers.

3. The method according to claim 1, characterized in that The geometric equation is expressed as: ； ； in, is the specific load when the conductor has the maximum sag, is the stress at maximum sag, and X is the horizontal distance between the lowest point of the sag and the higher tower.

4. The method according to claim 3, characterized in that The step of calculating the curvature at the lowest point of the sag in the overhead conductor geometric equation comprises: Determine the curvature expression in the overhead conductor geometry equation: ； When it is at the lowest point of the sag, x=0, and the curvature at the lowest point of the sag in the geometric equation of the overhead conductor is solved: 。 5. The method according to claim 1, characterized in that The calculation expression of the installation height of the plasma lightning arrester on the tower is: ； In the formula, is the installation height of the plasma lightning arrester on the tower, D is the conductor sag height and the horizontal tower distance between the two towers, is the height difference between the height of the conductor on the crossarm and the top of the tower, L is the conductor sag height, and p is the correction factor.

6. The method according to claim 5, characterized in that The value of the correction coefficient is associated with the installation height of the plasma lightning arrester, and the calculation expression of the correction coefficient is: when hour, ; when ≥ hour, .

7. The method according to claim 1, characterized in that After the step of calculating the curvature at the lowest point of the sag in the overhead conductor geometric equation, the method further includes: When the curvature is greater than or equal to the inverse of the arc segment protection radius, any height is used as the installation height of the plasma lightning arrester device.

8. A plasma lightning arrester device, characterized in that: The plasma lightning arrester device comprises: a base, a needle seat and an array lightning rod; wherein the installation height of the plasma lightning arrester device is the installation height obtained by the method for selecting the installation height of the plasma lightning arrester for lightning protection of large-span power transmission lines in plateau and mountainous areas as described in any one of claims 1 to 7.

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