Protection height setting method based on charge accumulation and lightning elimination principle of plasma lightning arrester

Abstract

The invention relates to the technical field of power system relay protection control, in particular to a protection height setting method based on a plasma lightning arrester charge accumulation and lightning elimination principle. According to the range of air field intensity distortion in the PLP working process, the PLP protection range is approximately equivalent to the hyperbola envelope range, the hyperbola asymptote slope angle is equivalent to the PLP lightning protection angle, the distance from the hyperbola focus to the original point is equivalent to the PLP protection height, and the relation between the hyperbola and the asymptote is approximately equivalent to the relation between the PLP actual protection range and the protection angle. And solving the protection height value of the PLP by using the protection angle of the PLP, the height of the protected object and the horizontal distance between the PLP and the protected object according to the hyperbolic protection range basic model corresponding to the PLP. The objective of the invention is to solve the problem of how to accurately calculate the protection height of the plasma lightning arrester.

Description

Technical Field

[0001] The present application relates to the technical field of relay protection control of power systems, and in particular to a protection height setting method based on the charge accumulation and lightning elimination principle of a plasma lightning arrester. Background Art

[0002] Plasma Lightning Protector (PLP) is a lightning protection device that has been widely used in recent years. Its protection angle is 10 to 14 times higher than the needle end height of the passive plasma lightning protection system. The principle is to ionize the air around the device to produce high-concentration ions to neutralize the thundercloud charge and its induced charge on the ground, so that the equivalent electrode plate between the thundercloud and the ground becomes a bad capacitor with leakage and cannot be fully charged. Unlike traditional lightning protection devices that lead lightning into the ground, the PLP device does not generate induced overvoltage. In the distorted electric field range formed within its protection angle range, the generated ions will diverge upward to offset the negative (positive) charge of the thundercloud electric field ionization downward, and diverge downward to offset the positive (negative) charge of the ground or the protected object ionization upward, so that the field strength in this range is weakened, effectively suppressing the formation and development of conductivity and suppressing the lightning strike caused by it.

[0003] Traditional protection range calculation methods such as the rolling ball method and the broken line method are mainly used to calculate the protection range of lightning rods or lightning conductors. The calculation is based on the lightning rod lightning induction principle and calculates the protection range through the final jump distance of the lightning leader, that is, the strike distance.

[0004] However, since PLP does not have a lightning-attracting effect, the protection range calculation of traditional lightning arresters is not completely applicable to PLP. In actual working conditions, the farther away from PLP, the lower its protection capability. The farther along the protection angle, i.e., the asymptote, the worse its protection capability is. It does not always maintain a linear relationship. When the traditional method is used to calculate the protection range, the protected objects at the edge of the protection range will still be at risk of being struck by lightning.

[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 setting the protection height based on the charge accumulation and lightning elimination principle of a plasma lightning arrester, aiming to solve the problem of how to accurately calculate the protection height of a plasma lightning arrester.

[0007] To achieve the above-mentioned purpose, the present application provides a method for setting the protection height based on the principle of plasma lightning arrester charge accumulation and lightning elimination, the method comprising:

[0008] Measuring the protection angle of the PLP, the height of the protected object, and the horizontal distance between the PLP and the protected object;

[0009] Calculating the complementary angle value of the protection angle, and calculating the tangent value of the complementary angle value;

[0010] Calculating the protection height of the PLP according to the tangent value, the height of the protected object and the horizontal spacing;

[0011] The calculation expression of the protection height is:

[0012]

[0013] Where m is the complementary angle of the PLP protection angle The tangent value of , h0 is the height of the protected object, x0 is the horizontal distance between PLP and the protected object, .

[0014] Optionally, the derivation step of the calculation expression of the protection height includes:

[0015] S1, establish the equivalent hyperbolic equation and its asymptote model with the vertex of the PLP installation:

[0016]

[0017]

[0018]

[0019] In the formula, a is the length of the real semi-axis of the hyperbola equation, b is the length of the imaginary semi-axis of the hyperbola equation, and c is the distance from the focus to the origin;

[0020] S2, the complementary angle of the protection angle is equal to the slope angle of the hyperbola asymptote, that is ,get:

[0021]

[0022] S3, assuming the installation height is ,make , that is, the focal distance is equal to the installation height of PLP, then:

[0023]

[0024] S4, let the height of the protected object be h0, the horizontal distance between PLP and the protected object be x0, and obtain the vertex coordinates of the protected object P(x0, y0), where: ;

[0025] S5, order , substitute the coordinates P(x0,y0) into In the above formula, we can get:

[0026]

[0027] S6, order , we can solve for H x The quadratic equation of :

[0028]

[0029] After finishing, we get:

[0030]

[0031] S7, set H x Need to meet , then we finally get:

[0032]

[0033] Optionally, let , , then the calculation expression of the protection height is also expressed as:

[0034]

[0035] Optionally, the protection angle of the PLP is associated with the altitude, air density, humidity, and temperature of the PLP.

[0036] Optionally, the protection angle ranges from 84° to 86°.

[0037] This application has at least the following technical effects:

[0038] 1. By establishing an equivalent hyperbolic model for the charge removal principle and range in thunderclouds and ground electric fields during the actual working process of PLP, the calculated protection range of plasma lightning arrester is closer to reality;

[0039] 2. By calculating the minimum installation height of PLP required when the height of the protected object is determined, the problem that the set value of traditional installation height calculation is inconsistent with the protection capability of PLP is effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of a first embodiment of a method for setting the protection height based on the charge accumulation and lightning elimination principle of a plasma lightning arrester according to the present application;

[0041] Figure 2 This is a schematic diagram of the PLP protection range involved in the embodiment of the present application;

[0042] Figure 3 This is a schematic diagram of the protection range after the PLP height is adjusted according to the 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] First embodiment

[0046] Reference Figure 1 In the first embodiment, the protection range calculation method based on the plasma lightning arrester charge accumulation and lightning elimination principle includes the following steps:

[0047] Step S10, measuring the protection angle of the PLP, the height of the protected object, and the horizontal distance between the PLP and the protected object;

[0048] In this embodiment, the protection angle, the height of the protected object, and the horizontal distance between the PLP and the protected object are measured.

[0049] Step S20, calculating the complementary angle value of the protection angle, and calculating the tangent value of the complementary angle value;

[0050] After the protection angle is measured, let the protection angle be , then the remaining angle values , the tangent value is .

[0051] Optionally, in this embodiment, the protection angle The value range is This data can take different values ​​according to altitude, air density, humidity, temperature, etc. For example, at higher altitudes, the air density is low, PLP is easier to ionize and generate charge, and the divergence range is wider.

[0052] Step S30, calculating the protection height of the PLP according to the tangent value, the height of the protected object and the horizontal spacing;

[0053] After calculating the tangent value of the complementary angle of the protection angle, Afterwards, the protection height of the PLP is calculated based on the tangent value, the height of the protected object and the horizontal spacing.

[0054] The calculation expression of the protection height is:

[0055]

[0056] Where m is the complementary angle of the PLP protection angle The tangent value of , h0 is the height of the protected object, x0 is the horizontal distance between PLP and the protected object, .

[0057] Specifically, refer to Figure 2 The schematic diagram of the PLP protection range is shown. The PLP distorts the electric field shape through the "needle tip array" on its surface, which increases the surrounding electric field strength to form strong ionization. The generated ions will diverge upward to offset the negative (positive) charge ionized by the thundercloud electric field, and diverge downward to offset the positive (negative) charge generated by the ionization of the ground or the protected object. The distorted shape of the electric field and the charge dissipation range can be approximately equivalent to the curve envelope range of the hyperbola equation, which is a structure that is approximately symmetrical up and down on the horizontal plane where the PLP vertex is located.

[0058] Optionally, for the derivation of the calculation expression of the protection height of PLP, refer to Figure 3 The protection range diagram after the PLP height is set is shown in FIG. The derivation steps of the calculation expression are as follows:

[0059] S1, establish the equivalent hyperbolic equation and its asymptote model with the vertex of the PLP installation:

[0060]

[0061]

[0062]

[0063] In the formula, a is the length of the real semi-axis of the hyperbola equation, b is the length of the imaginary semi-axis of the hyperbola equation, and c is the distance from the focus to the origin;

[0064] S2, the complementary angle of the protection angle is equal to the slope angle of the hyperbola asymptote, that is ,get:

[0065]

[0066] S3, assuming the installation height is ,make , that is, the focal distance is equal to the installation height of PLP, then:

[0067]

[0068] S4, let the height of the protected object be h0, and the horizontal distance between the PLP and the protected object be x0, and obtain the vertex coordinates P(x0, y0) of the protected object, where x0 is the horizontal distance from the protected object to the PLP installation point, which is a known quantity, and y0 is the vertical coordinate of the vertex of the protected object, which is equal to the PLP installation height H in the established model. x The negative value of the height difference with the protected object h0, y0 is the value including H x The unknown quantity is ;

[0069] S5, order , substitute the coordinates P(x0,y0) into In the above formula, we can get:

[0070]

[0071] S6, order , we can solve for H x The quadratic equation of :

[0072]

[0073] After finishing, we get:

[0074]

[0075] S7, set H x Need to meet , then we finally get:

[0076]

[0077] It should be noted that, in the equivalent hyperbola model simulating the PLP protection range constructed in this embodiment, the protection angle of the PLP itself is equivalent to the complementary angle of the slope angle of the hyperbola asymptote, that is, the upper boundary line of the protection range of the protection angle coincides with the asymptote, thereby establishing the relationship between the protection angle and the slope of the asymptote.

[0078] In the technical solution provided in this embodiment, according to the range of air field strength distortion during the operation of PLP, the PLP protection range is approximately equivalent to the hyperbolic envelope range, the slope angle of the hyperbolic asymptote is equivalent to the PLP lightning protection angle, and the distance c from the hyperbola focus to the origin is equivalent to the PLP installation height H. x The relationship between the hyperbola and the asymptote is used to approximate the relationship between the actual protection range and the protection angle of the equivalent PLP. Based on the hyperbola protection range basic model corresponding to the PLP, the protection angle of the PLP, the height of the protected object, and the horizontal distance between the PLP and the protected object are used to solve the protection height value H of the PLP. x .

[0079] Second embodiment

[0080] Based on the first embodiment, in some specific implementations, the PLP protection angle is set to , , the height of the protected object is h0=10m, and the horizontal distance between the protected object and the PLP installation point is x0=100m.

[0081] but , .

[0082] There are , , ;

[0083] Substitute:

[0084]

[0085] get: .

[0086] Third embodiment

[0087] As an implementation scheme, 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 plasma lightning arrester system to implement the process steps of the embodiment of the above method.

[0088] Therefore, the present application also provides a computer-readable storage medium, which stores a protection range calculation program based on the principle of charge concentration and lightning elimination of a plasma lightning arrester. When the protection range calculation program based on the principle of charge concentration and lightning elimination of a plasma lightning arrester is executed by a processor, it implements the various steps of the protection range calculation method based on the principle of charge concentration and lightning elimination of a plasma lightning arrester as described in the above embodiment.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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 setting the protection height based on the principle of plasma lightning arrester charge accumulation and lightning elimination, characterized in that: The method comprises the following steps: Measuring the protection angle of the PLP, the height of the protected object, and the horizontal distance between the PLP and the protected object; Calculating the complementary angle value of the protection angle, and calculating the tangent value of the complementary angle value; Calculating the protection height of the PLP according to the tangent value, the height of the protected object and the horizontal spacing; The calculation expression of the protection height is: ； Where m is the complementary angle of the PLP protection angle The tangent value of , h0 is the height of the protected object, x0 is the horizontal distance between PLP and the protected object, .

2. The method according to claim 1, characterized in that The derivation steps of the calculation expression of the protection height include: S1, establish the equivalent hyperbolic equation and its asymptote model with the vertex of the PLP installation: ； ； ； In the formula, a is the length of the real semi-axis of the hyperbola equation, b is the length of the imaginary semi-axis of the hyperbola equation, and c is the distance from the focus to the origin; S2, the complementary angle of the protection angle is equal to the slope angle of the hyperbola asymptote, that is ,get: ； S3, assuming the installation height is ,make , that is, the focal distance is equal to the installation height of PLP, then: ； S4, let the height of the protected object be h0, the horizontal distance between PLP and the protected object be x0, and obtain the vertex coordinates of the protected object P(x0, y0), where: ; S5, order , substitute the coordinates P(x0,y0) into In the above formula, we can get: ； S6, order , we can solve for H x The quadratic equation of : ； After finishing, we get: ； S7, set H x Need to meet , then we finally get: 。 3. The method according to claim 1 or 2, characterized in that make , , then the calculation expression of the protection height is also expressed as: 。 4. The method according to claim 1, characterized in that The protection angle of the PLP is associated with the altitude, air density, humidity, and temperature at which the PLP is located.

5. The method according to claim 4, characterized in that The protection angle ranges from 84° to 86°.

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