A method for correcting the PLP protection range considering lightning strike distance

Abstract

The present application relates to the field of power system protection technology, and in particular to a method for correcting the protection range of PLP considering the lightning strike distance. The rolling ball method is improved and applied to the calculation of the protection range of PLP, which makes up for the limitation that the original calculation method of the protection range of PLP does not consider the physical concept of lightning strike distance; by equilibrating three shielding cables at the top of the support pole, the structural stability of PLP can be effectively protected to avoid direct impact of wind and other natural forces, thereby significantly preventing the risk of damage or collapse under severe weather conditions; by considering the influence of the support pole height on it when calculating the earth strike distance, and introducing a correction strike distance coefficient for correction, the calculation accuracy of the actual protection range of PLP when the support pole is higher than 40m is significantly improved, aiming to solve the problem of how to improve the calculation accuracy of the lightning protection range of PLP.

Description

Technical Field

[0001] The present application relates to the technical field of power system protection, and in particular to a method for correcting a PLP protection range taking into account a lightning strike distance. Background Art

[0002] To protect new energy stations or transmission lines from lightning strikes, installing lightning rods has become an important protective measure. However, lightning rods themselves may generate high voltage and current when struck by lightning. If they are improperly installed or poorly maintained, they may cause new safety risks, such as electric shock or fire. The main working principle of lightning rods is to guide lightning to discharge, so that lightning current flows rapidly into the earth. At the same time, the ground potential rises, which may cause damage to secondary equipment and box transformers.

[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] According to the traditional PLP installation regulations, its surface protection range is directly determined by the height difference between the PLP needle end and the ground, which is specifically expressed as a cone range with a circle drawn by the protection range radius as the base and the height difference between the PLP needle end and the ground as the height. The optimal PLP installation height can be calculated. However, the inventor discovered in the process of conceiving and implementing this application that this method does not take into account the influence of the highest height of the protected equipment, and does not take into account the lightning strike distance theory of the Electric Geometry Model (EGM), which will cause the actual lightning protection range of the PLP to not meet the theoretical calculation value. For this reason, this application proposes a method for correcting the PLP protection range taking into account the lightning strike distance to improve the calculation accuracy of the lightning protection range of the 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 correcting the PLP protection range taking into account the lightning strike distance, 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 correcting the PLP protection range considering the lightning strike distance, which is applied to a PLP system. The PLP system includes a PLP, a support rod, and three shielding cables arranged in a circular array with equal spacing around the support rod as the center. One end of the shielding cable is arranged at the top of the support rod, and the other end is fixed to the ground at an angle. The method includes the following steps:

[0008] Taking 10 times of the height difference between the needle end of the PLP and the ground as the surface protection radius of the PLP system, and obtaining the rolling ball radius of the PLP, the shielding cable striking distance of the shielding cable, the earth striking distance taking into account the corrected striking distance coefficient, and the inclination angle between the shielding cable and the ground;

[0009] Calculate the PLP protection range and the shielding cable protection range according to the height difference between the needle end and the ground, the surface protection radius, the rolling ball radius, the shielding cable strike distance, the earth strike distance and / or the inclination angle;

[0010] The actual protection range of the PLP system is determined according to the PLP protection range and the shielding cable protection range, wherein the actual protection range does not include the ground lightning induction area.

[0011] Optionally, the step of calculating the PLP protection range includes:

[0012] The intersection of the support rod and the ground is taken as the origin of the coordinate system, the support rod is taken as the y-axis, and the projection of any target shielding cable on the ground is selected as the x-axis to establish a coordinate system, wherein the direction from the origin to the intersection of the target shielding cable and the ground is the positive direction of the x-axis, and the direction from the origin to the PLP is the positive direction of the y-axis;

[0013] Based on the constructed coordinate system, the PLP protection range is calculated according to the height difference between the needle end and the ground, the surface protection radius, the rolling ball radius, the shielding cable strike distance, the earth strike distance and the inclination angle, wherein the calculation expression of the PLP protection range is as follows:

[0014]

[0015] Among them, the value of x satisfies:

[0016] ;

[0017] Where h is the height difference between the needle end and the ground, r is the surface protection radius, R is the rolling ball radius, and r s is the shield strike distance, r g Strike the earth, is the inclination angle.

[0018] Optionally, the step of calculating the protection range of the shielding cable includes:

[0019] The intersection of the support rod and the ground is taken as the origin of the coordinate system, the support rod is taken as the y-axis, and the projection of any target shielding cable on the ground is selected as the x-axis to establish a coordinate system, wherein the direction from the origin to the intersection of the target shielding cable and the ground is the positive direction of the x-axis, and the direction from the origin to the PLP is the positive direction of the y-axis;

[0020] Based on the constructed coordinate system, the shielding cable protection range is calculated according to the height difference between the needle end and the ground, the surface protection radius, the rolling ball radius, the shielding cable strike distance, the earth strike distance and the inclination angle, wherein the calculation expression of the shielding cable protection range is as follows:

[0021] (1)

[0022] (1) In the formula, the value of x satisfies: ;

[0023] (2)

[0024] (2) In the formula, the value of x satisfies:

[0025]

[0026] Where h is the height difference between the needle end and the ground, r is the surface protection radius, R is the rolling ball radius, and r s To shield the strike distance, is the inclination angle.

[0027] Optionally, the longitudinal height of the ground mine-attracting area is equal to the ground strike distance, and the lateral height is associated with the surface protection radius, the rolling ball radius and the ground strike distance. The calculation expression of the ground mine-attracting area is:

[0028]

[0029]

[0030] In the formula, r is the surface protection radius, R is the rolling ball radius, r g Strike the earth, is the inclination angle.

[0031] Optionally, the calculation expression of the rolling ball radius of the PLP is:

[0032]

[0033] Where R is the rolling radius of the PLP, and h is the height difference between the needle end of the PLP and the ground.

[0034] Optionally, the calculation expression of the shielding wire strike distance is:

[0035]

[0036] Among them, r s is the shielding cable striking distance, and I is the lightning current amplitude.

[0037] Optionally, the calculation expression of the earth strike distance is:

[0038]

[0039] Among them, r g is the ground strike distance, I is the lightning current amplitude, m Indicates the length unit meter.

[0040] This application has at least the following beneficial effects:

[0041] 1. The rolling ball method is improved and applied to the calculation of the protection range of PLP, which makes up for the limitation that the original calculation method of the protection range of PLP does not consider the physical concept of lightning strike distance;

[0042] 2. By evenly arranging three shielding cables at the top of the support pole, the structural stability of the PLP can be effectively protected from direct impact by wind and other natural forces, thus significantly reducing the risk of damage or collapse under severe weather conditions;

[0043] 3. By considering the influence of the support pole height when calculating the earth strike distance and introducing a modified strike distance coefficient for correction, the calculation accuracy of the actual protection range of PLP when the support pole is higher than 40m is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the architecture of the hardware operating environment of the PLP protection range correction system involved in the embodiment of the present application;

[0045] Figure 2 This is a schematic diagram of the structure of a plasma lightning arrester according to an embodiment of the present application;

[0046] Figure 3 A schematic diagram of the arrangement of a PLP system involved in an embodiment of the present application;

[0047] Figure 4 A schematic flow chart of a first embodiment of a method for correcting a PLP protection range taking into account a lightning strike distance of the present application;

[0048] Figure 5 This is a schematic diagram of the actual protection scope of the PLP system involved in the second embodiment of the present application;

[0049] Figure 6This is a schematic diagram of the actual protection scope of the PLP system involved in the third embodiment of the present application.

[0050] 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

[0051] 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.

[0052] As an implementation plan, Figure 1 This is a schematic diagram of the architecture of the hardware operating environment of the PLP protection range correction system involved in the embodiment of the present application.

[0053] like Figure 1 As shown, the PLP protection range correction 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.

[0054] Those skilled in the art will understand that Figure 1 The PLP protection range modification system architecture shown in the figure does not constitute a limitation of the PLP protection range modification 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.

[0055] 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 protection range correction program considering the lightning strike distance. The operating system is a program for managing and controlling the hardware and software resources of the PLP protection range correction system.

[0056] exist Figure 1In the PLP protection range correction 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 protection range correction program considering the lightning strike distance stored in the memory 1005.

[0057] In this embodiment, the PLP protection range correction system includes: a memory 1005, a processor 1001, and a PLP protection range correction program considering the lightning strike distance stored in the memory and executable on the processor, wherein:

[0058] When the processor 1001 calls the PLP protection range correction program considering the lightning strike distance stored in the memory 1005, the following operations are performed:

[0059] Taking 10 times of the height difference between the needle end of the PLP and the ground as the surface protection radius of the PLP system, and obtaining the rolling ball radius of the PLP, the shielding cable striking distance of the shielding cable, the earth striking distance taking into account the corrected striking distance coefficient, and the inclination angle between the shielding cable and the ground;

[0060] Calculate the PLP protection range and the shielding cable protection range according to the height difference between the needle end and the ground, the surface protection radius, the rolling ball radius, the shielding cable strike distance, the earth strike distance and / or the inclination angle;

[0061] The actual protection range of the PLP system is determined according to the PLP protection range and the shielding cable protection range, wherein the actual protection range does not include the ground lightning induction area.

[0062] When the processor 1001 calls the PLP protection range correction program considering the lightning strike distance stored in the memory 1005, the following operations are performed:

[0063] The intersection of the support rod and the ground is taken as the origin of the coordinate system, the support rod is taken as the y-axis, and the projection of any target shielding cable on the ground is selected as the x-axis to establish a coordinate system, wherein the direction from the origin to the intersection of the target shielding cable and the ground is the positive direction of the x-axis, and the direction from the origin to the PLP is the positive direction of the y-axis;

[0064] Based on the constructed coordinate system, the PLP protection range is calculated according to the height difference between the needle end and the ground, the surface protection radius, the rolling ball radius, the shielding cable strike distance, the earth strike distance and the inclination angle, wherein the calculation expression of the PLP protection range is as follows:

[0065]

[0066] Among them, the value of x satisfies:

[0067] ;

[0068] Where h is the height difference between the needle end and the ground, r is the surface protection radius, R is the rolling ball radius, and r s is the shield strike distance, r g Strike the earth, is the inclination angle.

[0069] When the processor 1001 calls the PLP protection range correction program considering the lightning strike distance stored in the memory 1005, the following operations are performed:

[0070] The intersection of the support rod and the ground is taken as the origin of the coordinate system, the support rod is taken as the y-axis, and the projection of any target shielding cable on the ground is selected as the x-axis to establish a coordinate system, wherein the direction from the origin to the intersection of the target shielding cable and the ground is the positive direction of the x-axis, and the direction from the origin to the PLP is the positive direction of the y-axis;

[0071] Based on the constructed coordinate system, the shielding cable protection range is calculated according to the height difference between the needle end and the ground, the surface protection radius, the rolling ball radius, the shielding cable strike distance, the earth strike distance and the inclination angle, wherein the calculation expression of the shielding cable protection range is as follows:

[0072] (1)

[0073] (1) In the formula, the value of x satisfies: ;

[0074] (2)

[0075] (2) In the formula, the value of x satisfies:

[0076]

[0077] Where h is the height difference between the needle end and the ground, r is the surface protection radius, R is the rolling ball radius, and r s To shield the strike distance, is the inclination angle.

[0078] When the processor 1001 calls the PLP protection range correction program considering the lightning strike distance stored in the memory 1005, the following operations are performed:

[0079] The longitudinal height of the ground mine-attracting area is equal to the ground strike distance, and the lateral height is associated with the surface protection radius, the rolling ball radius and the ground strike distance. The calculation expression of the ground mine-attracting area is:

[0080]

[0081]

[0082] In the formula, r is the surface protection radius, R is the rolling ball radius, r g Strike the earth, When the processor 1001 calls the PLP protection range correction program considering the lightning strike distance stored in the memory 1005, the following operations are performed:

[0083] When the processor 1001 calls the PLP protection range correction program considering the lightning strike distance stored in the memory 1005, the following operations are performed:

[0084] The calculation expression of the rolling ball radius of the PLP is:

[0085]

[0086] Where R is the rolling ball radius of PLP, and h is the height difference between the needle end of PLP and the ground.

[0087] When the processor 1001 calls the PLP protection range correction program considering the lightning strike distance stored in the memory 1005, the following operations are performed:

[0088] The calculation expression of the shielding cable striking distance is:

[0089]

[0090] Among them, r s is the shielding cable striking distance, and I is the lightning current amplitude.

[0091] When the processor 1001 calls the PLP protection range correction program considering the lightning strike distance stored in the memory 1005, the following operations are performed:

[0092] The calculation expression of the earth strike distance is:

[0093]

[0094] Among them, r g is the earth strike distance, and I is the lightning current amplitude.

[0095] Based on the hardware architecture of the PLP protection range correction system of the above-mentioned power system protection technology, an embodiment of a method for correcting the PLP protection range taking into account the lightning strike distance of the present application is proposed.

[0096] First embodiment

[0097] Reference Figure 2The schematic diagram of the structure of the Plasma Lightning Protector (PLP) shown in the figure shows that the device emits an ionization dissipation current greater than 10mA to 30mA under passive conditions, neutralizing the charge of the thundercloud and the charge induced on the ground, making the thundercloud and the ground a bad capacitor with leakage and unable to be charged to the level of forming a lightning leader, that is, the field strength level of lightning striking the ground target cannot be reached, thus realizing lightning protection in a wide range of 84° to 86°.

[0098] Further, see Figure 3 The schematic diagram of the layout of the PLP system shown in the figure includes a PLP, a support rod and three shielding cables arranged in a circular array with equal spacing around the support rod as the center (i.e., 120° as shown in the figure), one end of the shielding cable is arranged at the top of the support rod, and the other end is fixed to the ground at an angle, and the inclination angle between the support rod and the ground is θ.

[0099] In this embodiment, refer to Figure 4 The method for correcting the PLP protection range considering the lightning strike distance comprises the following steps:

[0100] Step S10, taking 10 times of the height difference between the needle end of the PLP and the ground as the surface protection radius of the PLP system, and obtaining the rolling ball radius of the PLP, the shielding cable striking distance of the shielding cable, the earth striking distance taking into account the corrected striking distance coefficient, and the inclination angle between the shielding cable and the ground;

[0101] In this step, the surface protection radius r of a single PLP is proposed and determined according to the procedural method, and the original PLP protection height is clarified as:

[0102] (1)

[0103] That is, 10 times the height difference between the needle end of the PLP and the ground is used as the surface protection radius of the PLP system.

[0104] Also, the rolling ball radius of the PLP, as well as the shielding cable strike distance of the shielding cable, the earth strike distance taking into account the corrected strike distance coefficient, and the inclination angle between the shielding cable and the ground are obtained.

[0105] It should be noted that the rolling ball radius of the PLP uses the rolling ball method to calculate the protection range of the lightning rod. It is based on a sphere with a set radius rolling in the part that needs to be protected from lightning. When the sphere only touches the lightning rod or only touches the lightning rod and the ground, but does not touch the part that needs to be protected, then the part is protected by the lightning rod. It is expressed by the formula:

[0106] (2)

[0107] Where R is the rolling ball radius of PLP, and h is the height difference between the needle end of PLP and the ground.

[0108] It should be noted that the shielding cable striking distance of the shielding cable includes but is not limited to being determined by an electrical geometry model, and its calculation expression is:

[0109] (3)

[0110] Among them, r s is the shielding cable striking distance, and I is the lightning current amplitude.

[0111] It should be noted that the "corrected strike distance coefficient" is the ratio of the earth strike distance to the transmission line strike distance, and its calculation expression is:

[0112]

[0113] Where k is the coefficient for corrected striking distance, and h is the height difference between the needle tip and the ground between the PLP and the ground.

[0114] Furthermore, in actual line operation, for higher towers, the transmission line and the earth have different abilities to attract lightning leaders, so this application will use the strike distance coefficient formula proposed by the IEEE working group to correct the earth strike distance, and its calculation expression is:

[0115] (4)

[0116] Among them, r g is the earth strike distance, and I is the lightning current amplitude.

[0117] It should be noted that the earth strike distance and the inclination angle between the shielding cable and the ground can be directly obtained by measurement.

[0118] For the PLP protection range correction system, the rolling ball radius, the shielding cable striking distance of the shielding cable, the earth striking distance of the correction striking distance coefficient, and the inclination angle between the shielding cable and the ground are all preset values ​​and can be directly obtained when the PLP protection range needs to be corrected.

[0119] Step S20, calculating the PLP protection range and the shielding cable protection range according to the height difference between the needle end and the ground, the surface protection radius, the rolling ball radius, the shielding cable strike distance, the earth strike distance and / or the inclination angle;

[0120] In this step, the PLP protection range and the shielding cable protection range are calculated based on the parameters obtained in the previous step. The actual lightning protection range of the PLP is jointly determined based on the PLP protection range and the shielding cable protection range to achieve effective lightning protection for the protected equipment and the ground surface.

[0121] Specifically and optionally, both the PLP protection range and the shielding cable protection range need to first construct a two-dimensional plane rectangular coordinate system. As an optional implementation method, the intersection of the support rod and the ground is taken as the origin of the coordinate system, the support rod is taken as the y-axis, and the projection of any target shielding cable on the ground is selected as the x-axis to establish a coordinate system, wherein the direction from the origin to the intersection of the target shielding cable and the ground is the positive direction of the x-axis, and the direction from the origin to the PLP is the positive direction of the y-axis.

[0122] After the coordinate system is established, the calculation of the PLP protection range is mainly obtained by the rolling ball method, and the calculation expression is:

[0123] (5)

[0124] Among them, the value of x satisfies:

[0125] ;

[0126] Where h is the height difference between the needle end and the ground, r is the surface protection radius, R is the rolling ball radius, and r s is the shield strike distance, r g Strike the earth, is the inclination angle.

[0127] After the coordinate system is established, the calculation expression of the shielding cable protection range is as follows:

[0128] (6)

[0129] (6) In the formula, the value of x satisfies: ;

[0130] (7)

[0131] (7) In the formula, the value of x satisfies:

[0132]

[0133] Where h is the height difference between the needle end and the ground, r is the surface protection radius, R is the rolling ball radius, and r s To shield the strike distance, is the inclination angle.

[0134] Step S30, determining the actual protection range of the PLP system according to the PLP protection range and the shielding cable protection range, wherein the actual protection range does not include the ground lightning induction area.

[0135] In this step, after obtaining the PLP protection range and the shielding cable protection range, the actual protection range of the PLP system can be obtained by subtracting the ground lightning induction area from the geometric space formed by the PLP protection range and the shielding cable protection range.

[0136] It should be noted that the earth's lightning attraction area means that if lightning strikes directly to this area, the lightning will be directly attracted by the earth to form ground lightning, which is equivalent to an induced lightning strike for the protected equipment, so it does not fall within the actual protection range of PLP.

[0137] Specifically and optionally, the longitudinal height of the ground mine attracting area is equal to the ground strike distance, and the lateral height is associated with the surface protection radius, the rolling ball radius and the ground strike distance. The calculation expression of the ground mine attracting area is:

[0138]

[0139] (8)

[0140] In the formula, r is the surface protection radius, R is the rolling ball radius, r g Strike the earth, is the inclination angle.

[0141] In the technical solution provided in this embodiment, three shielding cables are first evenly arranged at the top of the support pole, which can effectively protect the structural stability of the PLP and prevent it from being directly impacted by wind and other natural forces, thereby significantly preventing the risk of damage or collapse under severe weather conditions; at the same time, the rolling ball method is improved and applied to the calculation of the protection range of the PLP, which makes up for the limitation that the original calculation method of the protection range of the PLP does not consider the physical concept of lightning strike distance, and at the same time considers the strike distance of the earth, clarifies the actual protection range of the PLP, and can more reasonably optimize the lightning protection layout strategy of typical equipment in the site according to its actual protection range; in addition, the influence of the support pole height on it is considered when calculating the strike distance to the earth, and a corrected strike distance coefficient is introduced for correction, thereby significantly improving the calculation accuracy of the actual protection range of the PLP when the support pole is higher than 40m.

[0142] Second embodiment

[0143] As an optional implementation, based on the first embodiment, it is assumed that the height difference h between the PLP needle end and the ground is 50 m, and the inclination angle between the support rod and the ground is 45°.

[0144] First, substitute into formula (1) to calculate the surface protection radius of a single PLP r = 500 m;

[0145] Furthermore, the rolling ball radius of PLP is calculated according to formula (2): R = 2525 m;

[0146] Furthermore, the striking distance of the shielding cable is calculated according to formula (3): Earth Strike Distance , where the lightning current amplitude is 5KA, and the strike distance of the shielding cable is calculated =28.47m, Earth strike distance =15.66m;

[0147] Furthermore, the intersection of the support rod and the ground is taken as the origin of the coordinate system, the support rod is taken as the y-axis, and the projection of any target shielding cable on the ground is selected as the x-axis to establish a coordinate system, wherein the direction from the origin to the intersection of the target shielding cable and the ground is the positive direction of the x-axis, and the direction from the origin to the PLP is the positive direction of the y-axis. After the coordinate system is established, it can be known that the coordinates of the center point O of the rolling ball method are (r, R), and the radius is R. Substituting them into formula (5) for calculation, the rolling ball equation is:

[0148]

[0149] That is, the scope of PLP protection is:

[0150]

[0151] Similarly, substituting into equations (6) and (7), we can obtain the protection range of the shielding cable:

[0152]

[0153] Substitute into formula (8) to calculate the ground lightning induction area:

[0154]

[0155] Finally, based on the above protection scope, we get Figure 5 The actual protection scope of the PLP system is shown in the figure.

[0156] Third embodiment

[0157] As an optional implementation, based on the first embodiment, it is assumed that the height difference h between the PLP needle end and the ground is 100 m, and the inclination angle between the support rod and the ground is 45°.

[0158] First, substitute into formula (1) to calculate the surface protection radius of a single PLP r = 1000 m;

[0159] Furthermore, the rolling ball radius of PLP is calculated according to formula (2): R = 5050 m;

[0160] Furthermore, the striking distance of the shielding cable is calculated according to formula (3): Earth Strike Distance , where the lightning current amplitude is 5KA, and the strike distance of the shielding cable is calculated =28.47m, Earth strike distance =15.66m;

[0161] Furthermore, the intersection of the support rod and the ground is taken as the origin of the coordinate system, the support rod is taken as the y-axis, and the projection of any target shielding cable on the ground is selected as the x-axis to establish a coordinate system, wherein the direction from the origin to the intersection of the target shielding cable and the ground is the positive direction of the x-axis, and the direction from the origin to the PLP is the positive direction of the y-axis. After the coordinate system is established, it can be known that the coordinates of the center point O of the rolling ball method are (r, R), and the radius is R. Substituting them into formula (5) for calculation, the rolling ball equation is:

[0162]

[0163] That is, the scope of PLP protection is:

[0164]

[0165] Similarly, substituting into equations (6) and (7), we can obtain the protection range of the shielding cable:

[0166]

[0167] Substitute into formula (8) to calculate the ground lightning induction area:

[0168]

[0169] Finally, based on the above protection scope, we get Figure 6 The actual protection scope of the PLP system is shown in the figure.

[0170] In addition, it can be understood by a person 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 protection range correction system to implement the process steps of the embodiment of the above method.

[0171] Therefore, the present application also provides a computer-readable storage medium, which stores a PLP protection range correction program considering lightning strike distance. When the PLP protection range correction program considering lightning strike distance is executed by a processor, the various steps of the PLP protection range correction method considering lightning strike distance described in the above embodiment are implemented.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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 correcting the PLP protection range considering the lightning strike distance, characterized in that: Applied to a PLP system, the PLP system comprises a PLP, a support rod and three shielding cables arranged in a circular array with equal spacing around the support rod as the center, one end of the shielding cable is arranged at the top of the support rod, and the other end is fixed to the ground at an angle, the method comprises the following steps: Taking 10 times of the height difference between the needle end of the PLP and the ground as the surface protection radius of the PLP system, and obtaining the rolling ball radius of the PLP, the shielding cable striking distance of the shielding cable, the earth striking distance taking into account the corrected striking distance coefficient, and the inclination angle between the shielding cable and the ground; Calculate the PLP protection range and the shielding cable protection range according to the height difference between the needle end and the ground, the surface protection radius, the rolling ball radius, the shielding cable strike distance, the earth strike distance and / or the inclination angle; Determine the actual protection range of the PLP system according to the PLP protection range and the shielding cable protection range, wherein the actual protection range does not include the ground lightning induction area; The calculation steps of the shielding cable protection range include: The intersection of the support rod and the ground is taken as the origin of the coordinate system, the support rod is taken as the y-axis, and the projection of any target shielding cable on the ground is selected as the x-axis to establish a coordinate system, wherein the direction from the origin to the intersection of the target shielding cable and the ground is the positive direction of the x-axis, and the direction from the origin to the PLP is the positive direction of the y-axis; Based on the constructed coordinate system, the shielding cable protection range is calculated according to the height difference between the needle end and the ground, the surface protection radius, the rolling ball radius, the shielding cable strike distance, the earth strike distance and the inclination angle, wherein the calculation expression of the shielding cable protection range is as follows: （1）； (1) In the formula, the value of x satisfies: ; （2）； (2) In the formula, the value of x satisfies: ； Where h is the height difference between the needle end and the ground, r is the surface protection radius, R is the rolling ball radius, and r s To shield the strike distance, is the inclination angle.

2. The method according to claim 1, characterized in that The calculation steps of the PLP protection range include: The intersection of the support rod and the ground is taken as the origin of the coordinate system, the support rod is taken as the y-axis, and the projection of any target shielding cable on the ground is selected as the x-axis to establish a coordinate system, wherein the direction from the origin to the intersection of the target shielding cable and the ground is the positive direction of the x-axis, and the direction from the origin to the PLP is the positive direction of the y-axis; Based on the constructed coordinate system, the PLP protection range is calculated according to the height difference between the needle end and the ground, the surface protection radius, the rolling ball radius, the shielding cable strike distance, the earth strike distance and the inclination angle, wherein the calculation expression of the PLP protection range is as follows: ； Among them, the value of x satisfies: ； Where h is the height difference between the needle end and the ground, r is the surface protection radius, R is the rolling ball radius, and r s is the shield strike distance, r g Strike the earth, is the inclination angle.

3. The method according to claim 1, characterized in that The longitudinal height of the ground mine-attracting area is equal to the ground strike distance, and the lateral height is associated with the surface protection radius, the rolling ball radius and the ground strike distance. The calculation expression of the ground mine-attracting area is: ； ； In the formula, r is the surface protection radius, R is the rolling ball radius, r g Strike the earth, is the inclination angle.

4. The method according to claim 1, characterized in that The calculation expression of the rolling ball radius of the PLP is: ； Where R is the rolling ball radius of PLP, and h is the height difference between the needle end of PLP and the ground.

5. The method according to claim 1, characterized in that The calculation expression of the shielding cable striking distance is: ； Among them, r s is the shielding cable striking distance, and I is the lightning current amplitude.

6. The method according to claim 1, characterized in that The calculation expression of the earth strike distance is: ； Among them, r g is the ground strike distance, I is the lightning current amplitude, m Indicates the length unit meter.

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