A magnetic coupling coil optimization method, device, computer equipment and storage medium

Abstract

The present application proposes a method for optimizing a magnetic coupling coil, the method comprising: calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil; calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil; calculating the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability; optimizing the magnetic coupling coil according to the number of secondary end turns. The present application calculates the average magnetic path length and the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil, and calculates the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability; the parameters of the magnetic coupling coil can be reasonably configured, and energy can be effectively obtained from the power grid to provide a stable power supply for detection or communication equipment in the power grid, and the magnetic coupling coil can be made more reliable while meeting the power requirements.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a magnetic coupling coil optimization method, device, computer equipment and storage medium. Background Art

[0002] As the core content of the future development of the power industry, smart grid can provide guarantee for the large-scale and efficient development of green energy in my country, give full play to the role of power grid in optimizing resource allocation and serving the development of national economy, and have very important practical significance for the comprehensive, coordinated and sustainable development of my country's economy and society. However, the energy-taking devices in the existing smart grid are difficult to obtain energy and power supply, large in size, high in cost, and have large distorted signals. They cannot effectively obtain energy from the grid to provide stable power supply for detection or communication equipment in the grid, which greatly restricts the development of smart grid. Summary of the invention

[0003] The present application proposes a magnetic coupling coil optimization method, device, computer equipment and storage medium to solve the technical problem in the prior art that it is impossible to effectively obtain energy from the power grid to provide a stable power supply for detection or communication equipment in the power grid.

[0004] In a first aspect, the present application proposes a magnetic coupling coil optimization method, the method comprising:

[0005] Calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil;

[0006] Calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil;

[0007] Calculating the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability;

[0008] The magnetic coupling coil is optimized according to the number of turns of the secondary end.

[0009] In combination with the first aspect, in one achievable manner, the magnetic coupling coil is an open-type winding.

[0010] In combination with the first aspect, in an achievable manner, calculating the equivalent magnetic permeability of the magnetic coupling coil based on the air gap length of the magnetic coupling coil includes: calculating the inner diameter and outer diameter of the magnetic coupling coil based on the saturation excitation current of the magnetic coupling coil; calculating the average magnetic path length of the magnetic coupling coil based on the inner diameter and outer diameter of the magnetic coupling coil; and calculating the equivalent magnetic permeability of the magnetic coupling coil based on the air gap length of the magnetic coupling coil and the average magnetic path length.

[0011] In combination with the first aspect, in an achievable manner, calculating the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil includes: calculating the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil and the following saturation excitation current calculation formula:

[0012]

[0013] Among them, I umax is the saturation excitation current of the magnetic coupling coil, B s is the saturation magnetic induction intensity of the magnetic coupling coil, u0 is the vacuum magnetic permeability of the magnetic coupling coil, u r is the relative magnetic permeability of the magnetic core when it is not cut, D is the outer diameter of the magnetic coupling coil, and d is the inner diameter of the magnetic coupling coil.

[0014] In combination with the first aspect, in an achievable manner, calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil includes: calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability, the power of the magnetic coupling coil and the following power formula:

[0015]

[0016] Among them, U2 represents the output voltage of the magnetic coupling coil, R represents the load resistance, f represents the frequency of the primary current, I1 represents the primary current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, l represents the average magnetic path length of the magnetic coupling coil, and μ represents the equivalent magnetic permeability of the magnetic coupling coil.

[0017] In combination with the first aspect, in an achievable manner, the method further includes: designing an anti-shock module according to the power of the magnetic coupling coil, the anti-shock module being connected to the output end of the magnetic coupling coil, and the anti-shock module being used to protect the circuit connected to the magnetic coupling coil.

[0018] In combination with the first aspect, in an achievable manner, the method further includes: designing an overvoltage protection module according to the output voltage of the magnetic coupling coil, the overvoltage protection module being connected to the output end of the magnetic coupling coil, and the overvoltage protection module being used to protect the circuit connected to the magnetic coupling coil.

[0019] In a second aspect, the present application proposes a magnetic coupling coil optimization device, the device comprising:

[0020] A first calculation module, used for calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil;

[0021] A second calculation module, used for calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil;

[0022] A third calculation module, used for calculating the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability;

[0023] An optimization module is used to optimize the magnetic coupling coil according to the number of secondary end turns.

[0024] In combination with the second aspect, in one achievable manner, the magnetic coupling coil is an open-type winding.

[0025] In combination with the second aspect, in an achievable manner, the first calculation module is specifically used to: calculate the inner diameter and outer diameter of the magnetic coupling coil based on the saturation excitation current of the magnetic coupling coil; calculate the average magnetic path length of the magnetic coupling coil based on the inner diameter and outer diameter of the magnetic coupling coil; calculate the equivalent magnetic permeability of the magnetic coupling coil based on the air gap length of the magnetic coupling coil and the average magnetic path length.

[0026] In conjunction with the second aspect, in an achievable manner, the first calculation module is further specifically used to: calculate the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil and the following saturation excitation current calculation formula:

[0027]

[0028] Among them, I umax is the saturation excitation current of the magnetic coupling coil, B s is the saturation magnetic induction intensity of the magnetic coupling coil, u0 is the vacuum magnetic permeability of the magnetic coupling coil, u r is the relative magnetic permeability of the magnetic core when it is not cut, D is the outer diameter of the magnetic coupling coil, and d is the inner diameter of the magnetic coupling coil.

[0029] In conjunction with the second aspect, in an achievable manner, the second calculation module is specifically used to calculate the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability, the power of the magnetic coupling coil and the following power formula:

[0030]

[0031] Among them, U2 represents the output voltage of the magnetic coupling coil, R represents the load resistance, f represents the frequency of the primary current, I1 represents the primary current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, l represents the average magnetic path length of the magnetic coupling coil, and μ represents the equivalent magnetic permeability of the magnetic coupling coil.

[0032] In combination with the second aspect, in an achievable manner, the device also includes a first design module, which is used to: design an anti-shock module according to the power of the magnetic coupling coil, the anti-shock module is connected to the output end of the magnetic coupling coil, and the anti-shock module is used to protect the circuit connected to the magnetic coupling coil.

[0033] In combination with the second aspect, in an achievable manner, the device also includes a second design module, which is used to: design an overvoltage protection module according to the output voltage of the magnetic coupling coil, the overvoltage protection module is connected to the output end of the magnetic coupling coil, and the overvoltage protection module is used to protect the circuit connected to the magnetic coupling coil.

[0034] In a third aspect, the present application proposes a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the following steps:

[0035] Calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil;

[0036] Calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil;

[0037] Calculating the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability;

[0038] The magnetic coupling coil is optimized according to the number of turns of the secondary end.

[0039] In combination with the third aspect, in one achievable manner, the magnetic coupling coil is an open-type winding.

[0040] In combination with the third aspect, in an achievable manner, the calculating the equivalent magnetic permeability of the magnetic coupling coil based on the air gap length of the magnetic coupling coil includes: calculating the inner diameter and the outer diameter of the magnetic coupling coil based on the saturation excitation current of the magnetic coupling coil; calculating the average magnetic path length of the magnetic coupling coil based on the inner diameter and the outer diameter of the magnetic coupling coil; and calculating the equivalent magnetic permeability of the magnetic coupling coil based on the air gap length of the magnetic coupling coil and the average magnetic path length.

[0041] In combination with the third aspect, in an achievable manner, calculating the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil includes: calculating the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil and the following saturation excitation current calculation formula:

[0042]

[0043] Among them, I umaxis the saturation excitation current of the magnetic coupling coil, B s is the saturation magnetic induction intensity of the magnetic coupling coil, u0 is the vacuum magnetic permeability of the magnetic coupling coil, u r is the relative magnetic permeability of the magnetic core when it is not cut, D is the outer diameter of the magnetic coupling coil, and d is the inner diameter of the magnetic coupling coil.

[0044] In combination with the third aspect, in an achievable manner, calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil includes: calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability, the power of the magnetic coupling coil and the following power formula:

[0045]

[0046] Among them, U2 represents the output voltage of the magnetic coupling coil, R represents the load resistance, f represents the frequency of the primary current, I1 represents the primary current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, l represents the average magnetic path length of the magnetic coupling coil, and μ represents the equivalent magnetic permeability of the magnetic coupling coil.

[0047] In combination with the third aspect, in an achievable manner, the method further includes: designing an anti-shock module according to the power of the magnetic coupling coil, the anti-shock module being connected to the output end of the magnetic coupling coil, and the anti-shock module being used to protect the circuit connected to the magnetic coupling coil.

[0048] In combination with the third aspect, in an achievable manner, the method further includes: designing an overvoltage protection module according to the output voltage of the magnetic coupling coil, the overvoltage protection module being connected to the output end of the magnetic coupling coil, and the overvoltage protection module being used to protect the circuit connected to the magnetic coupling coil.

[0049] In a fourth aspect, the present application proposes a computer-readable storage medium, characterized in that a computer program is stored therein, and when the computer program is executed by a processor, the processor executes the following steps:

[0050] Calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil;

[0051] Calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil;

[0052] Calculating the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability;

[0053] The magnetic coupling coil is optimized according to the number of turns of the secondary end.

[0054] In combination with the fourth aspect, in one achievable manner, the magnetic coupling coil is an open-type winding.

[0055] In combination with the fourth aspect, in an achievable manner, the calculating the equivalent magnetic permeability of the magnetic coupling coil based on the air gap length of the magnetic coupling coil includes: calculating the inner diameter and the outer diameter of the magnetic coupling coil based on the saturation excitation current of the magnetic coupling coil; calculating the average magnetic path length of the magnetic coupling coil based on the inner diameter and the outer diameter of the magnetic coupling coil; and calculating the equivalent magnetic permeability of the magnetic coupling coil based on the air gap length of the magnetic coupling coil and the average magnetic path length.

[0056] In conjunction with the fourth aspect, in an achievable manner, calculating the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil includes: calculating the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil and the following saturation excitation current calculation formula:

[0057]

[0058] Among them, I umax is the saturation excitation current of the magnetic coupling coil, B s is the saturation magnetic induction intensity of the magnetic coupling coil, u0 is the vacuum magnetic permeability of the magnetic coupling coil, u r is the relative magnetic permeability of the magnetic core when it is not cut, D is the outer diameter of the magnetic coupling coil, and d is the inner diameter of the magnetic coupling coil.

[0059] In combination with the fourth aspect, in an achievable manner, calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil includes: calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability, the power of the magnetic coupling coil and the following power formula:

[0060]

[0061] Among them, U2 represents the output voltage of the magnetic coupling coil, R represents the load resistance, f represents the frequency of the primary current, I1 represents the primary current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, l represents the average magnetic path length of the magnetic coupling coil, and μ represents the equivalent magnetic permeability of the magnetic coupling coil.

[0062] In combination with the fourth aspect, in an achievable manner, the method further includes: designing an anti-shock module according to the power of the magnetic coupling coil, the anti-shock module being connected to the output end of the magnetic coupling coil, and the anti-shock module being used to protect the circuit connected to the magnetic coupling coil.

[0063] In combination with the fourth aspect, in an achievable manner, the method further includes: designing an overvoltage protection module according to the output voltage of the magnetic coupling coil, the overvoltage protection module being connected to the output end of the magnetic coupling coil, and the overvoltage protection module being used to protect the circuit connected to the magnetic coupling coil.

[0064] The present application can achieve the following beneficial effects: The present application proposes a magnetic coupling coil optimization method, the method comprising: calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil; calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil; calculating the secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability; optimizing the magnetic coupling coil according to the secondary end turns. The present application calculates the average magnetic path length and effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil, and calculates the secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability; the parameters of the magnetic coupling coil can be reasonably configured, and energy can be effectively obtained from the power grid to provide a stable power supply for detection or communication equipment in the power grid, and the magnetic coupling coil can be made more reliable while meeting the power requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 A schematic diagram of a flow chart of a magnetic coupling coil optimization method provided in an embodiment of the present application;

[0066] Figure 2 A schematic diagram of the structure of a magnetic coupling coil optimization device provided in an embodiment of the present application;

[0067] Figure 3 A schematic diagram of the structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0069] The technical solution proposed in this application is applicable to the technical scenario of drawing power from the transmission line through magnetic coupling coils. Specifically, it is applicable to the scenario where the magnetic coupling coils effectively obtain the induced voltage through the principle of electromagnetic induction to provide a stable and reliable working power supply for the load.

[0070] Specifically, the magnetic coupling coil described in the present application may be a magnetic coupling coil in a CT energy extraction device.

[0071] In one embodiment, the present application proposes a magnetic coupling coil optimization method, such as Figure 1 As shown, Figure 1 A schematic flow chart of a magnetic coupling coil optimization method provided in an embodiment of the present application. The method comprises:

[0072] Step 101: Calculate the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil.

[0073] The magnetic coupling coil is an open-ended coil, and is connected to a power transmission line of a power grid, and is used to obtain an induction point voltage from the power transmission line through the principle of electromagnetic induction.

[0074] Specifically, the energy acquisition module may be connected to the transmission line by hanging on the transmission line.

[0075] Specifically, the magnetic coupling coil is a non-closed magnetic material. Before calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil, it is also necessary to compare the magnetic core parameters of different materials to determine the magnetic core material of the magnetic coupling coil. Select a material with a larger initial magnetic permeability and saturation magnetic induction intensity as the coil core material. For example, it can be an open-and-close silicon steel coil. Since the open-and-close silicon steel coil uses a magnetic material with a separated structure, the coil is wound along the tangential component direction according to the equal relationship between the intensity of the tangential component of the magnetic field on the interface of different magnetic media, and the magnetic amplification function of the magnetic material is utilized. Then, the magnetic field energy generated after the cable passes through can be effectively utilized to obtain electrical energy. Although the introduction of magnetic materials will change the distribution of the electromagnetic field around the cable, the magnetic induction intensity in the magnetic material will be much greater than that of the air medium. The reason is that after the silicon steel coil is introduced, it can be seen from the interface boundary conditions of the magnetic field in the inhomogeneous medium that if the external magnetic field is incident on the silicon steel coil with a large incident angle, the largest possible refraction angle can be obtained in the silicon steel coil, that is, the largest possible tangential component, thereby improving the efficiency of obtaining electrical energy using the magnetic field energy generated after the cable passes through.

[0076] Specifically, the magnetic coupling coil uses an open silicon steel coil, which is convenient for on-site installation and cost disclosure. However, the open silicon steel coil introduces an air gap, which has a great influence on the magnetic permeability of the coil. Therefore, the coil cross section needs to be polished and rust-proofed when used, and the two cross sections should be pressed and aligned as much as possible during installation.

[0077] Among them, the equivalent magnetic permeability is the effective magnetic permeability of the magnetic coupling coil.

[0078] In one embodiment, calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil includes: calculating the inner diameter and the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil; calculating the average magnetic path length of the magnetic coupling coil according to the inner diameter and the outer diameter of the magnetic coupling coil; and calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil and the average magnetic path length.

[0079] Among them, in one embodiment, before calculating the inner diameter and outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil, it is also necessary to compare the core parameters of different materials to determine the material of the magnetic core. Specifically, a material with a large initial magnetic permeability and saturation magnetic induction intensity is selected as the coil core material. According to the wire diameter of the actual high-voltage line, and considering factors such as the thickness of the core protective box, the thickness of the winding, the thickness of the inner layer of the core fixed structure, and the thickness of the clamping structure between the cable and the energy extraction coil, the inner diameter length of the magnetic coupling coil is determined to make the inner diameter length of the magnetic coupling coil as small as possible.

[0080] Specifically, after determining the inner diameter of the magnetic coupling coil, it is also necessary to determine the outer diameter of the magnetic coupling coil, and the outer diameter of the magnetic coupling coil is calculated based on the saturation excitation current of the magnetic coupling coil. The outer diameter of the magnetic coupling coil is calculated based on the saturation excitation current of the magnetic coupling coil, including:

[0081] The outer diameter of the magnetic coupling coil is calculated according to the saturation excitation current of the magnetic coupling coil and the following saturation excitation current calculation formula:

[0082]

[0083] Among them, I umax is the saturation excitation current of the magnetic coupling coil, B s is the saturation magnetic induction intensity of the magnetic coupling coil, u0 is the vacuum magnetic permeability of the magnetic coupling coil, u r is the relative magnetic permeability of the magnetic core when it is not cut, D is the outer diameter of the magnetic coupling coil, and d is the inner diameter of the magnetic coupling coil.

[0084] Wherein, the saturation excitation current of the magnetic coupling coil is equal to the primary current.

[0085] Specifically, after determining the inner diameter and outer diameter of the magnetic coupling coil, the average magnetic path length of the magnetic coupling coil can be determined. Specifically, the average magnetic path length of the magnetic coupling coil is the sum of the inner diameter, outer diameter, and height of the magnetic coupling coil. The height of the magnetic coupling coil can be directly measured after determining the inner diameter and outer diameter.

[0086] Specifically, in order to facilitate the installation of the CT energy extraction device on the high-voltage line, the magnetic coupling coil needs to be made into an open type, so an air gap is inevitably introduced. Although the air gap can effectively prevent saturation, the air gap has a relatively large impact on the magnetic permeability of the magnetic core. The cross section of the magnetic core should be polished smooth and the length of the air gap should be reduced as much as possible. After the influence of the air gap, the magnetic permeability of the magnetic coupling coil is the equivalent magnetic permeability of the magnetic coupling coil.

[0087] Specifically, after determining the average magnetic path length of the magnetic coupling coil, the equivalent magnetic permeability of the magnetic coupling coil can be calculated according to the air gap length of the magnetic coupling coil and the average magnetic path length. The equivalent magnetic permeability of the magnetic coupling coil is calculated according to the air gap length of the magnetic coupling coil and the average magnetic path length, including:

[0088] The equivalent magnetic permeability of the magnetic coupling coil is calculated according to the air gap length of the magnetic coupling coil, the average magnetic path length and the following formula:

[0089]

[0090] Wherein, μ represents the equivalent magnetic permeability of the magnetic coupling coil, u r Indicates the relative magnetic permeability of the core when it is not cut, l g represents the air gap length of the magnetic coupling coil, and l represents the average magnetic path length of the magnetic coupling coil.

[0091] Step 102: Calculate the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil.

[0092] Among them, when the current is relatively small, the cross-sectional area of ​​the magnetic core that meets the output power requirements can be obtained based on the current fluctuation range of the high-voltage line and the output power formula of the magnetic coupling coil, that is, the power demand of the reference load.

[0093] Specifically, calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil includes:

[0094] The effective cross-sectional area of ​​the magnetic coupling coil is calculated according to the equivalent magnetic permeability, the power of the magnetic coupling coil and the following power formula:

[0095]

[0096] Among them, P represents the power of the magnetic coupling coil, U2 represents the output voltage of the magnetic coupling coil, R represents the load resistance, f represents the frequency of the primary current, I1 represents the primary current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, l represents the average magnetic path length of the magnetic coupling coil, and μ represents the equivalent magnetic permeability of the magnetic coupling coil.

[0097] Step 103: Calculate the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability.

[0098] Specifically, after determining the effective cross-sectional area of ​​the magnetic coupling coil, the number of secondary end turns of the magnetic coupling coil can be determined according to the following formula:

[0099]

[0100] Among them, P represents the power of the magnetic coupling coil, U2 represents the output voltage of the magnetic coupling coil, R represents the load resistance, f represents the frequency of the primary current, I1 represents the primary current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, l represents the average magnetic path length of the magnetic coupling coil, μ represents the equivalent magnetic permeability of the magnetic coupling coil, and N2 represents the number of turns at the secondary end.

[0101] If and only if the number of turns N2 at the secondary end of the coil satisfies When , the coil output power reaches the maximum, and the formula for k is:

[0102]

[0103] f represents the frequency of the primary-end current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, and μ represents the equivalent magnetic permeability of the magnetic coupling coil.

[0104] Step 104: Optimize the magnetic coupling coil according to the number of secondary end turns.

[0105] Among them, the magnetic coupling coil is set on the transmission line, and the interference is relatively serious. Therefore, the winding method of the magnetic coupling coil should be optimized according to the number of turns at the secondary end. First, the turn density and cross-sectional area are kept uniform, which can eliminate or effectively reduce the influence of the parallel component of the interference magnetic field and the change of the relative position of the wire and the coil; second, a loop is wound in the center of the frame in the opposite direction of the coil, which can eliminate or effectively reduce the influence of the vertical component of the interference magnetic field.

[0106] In one embodiment, the method further includes: designing an anti-shock module according to the power of the magnetic coupling coil, the anti-shock module being connected to the output end of the magnetic coupling coil, and the anti-shock module being used to protect the circuit connected to the magnetic coupling coil.

[0107] Among them, in order to prevent instantaneous large currents such as lightning strikes from damaging subsequent circuits, the method of connecting a TVS bidirectional diode in parallel at the output end of the magnetic coupling coil is selected, and the maximum allowable safe voltage of the circuit, the maximum pulse power that can be tolerated, etc. are comprehensively considered to select a suitable type of TVS bidirectional diode.

[0108] Specifically, the TVS bidirectional diode model is SMC6.5CA, whose maximum breakdown voltage is 11V. Its leakage current is extremely small at the uA level during normal operation. When a transient overvoltage occurs, it can protect the subsequent circuit from damage.

[0109] In one embodiment, the method further includes: designing an overvoltage protection module according to the output voltage of the magnetic coupling coil, the overvoltage protection module being connected to the output end of the magnetic coupling coil, and the overvoltage protection module being used to protect the circuit connected to the magnetic coupling coil.

[0110] Among them, when the magnetic coupling coil outputs a relatively high voltage for a long time, in order to protect the subsequent circuit and enable the magnetic coupling coil to provide a stable voltage for the load, a voltage regulator diode connected in parallel with an energy dissipation resistor is selected to be connected to the output end of the magnetic coupling coil.

[0111] Specifically, the energy dissipation resistor may be a varistor with a model number of 180KD10 or MYG-10D180.

[0112] The present application proposes a method for optimizing a magnetic coupling coil, the method comprising: calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil; calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil; calculating the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability; optimizing the magnetic coupling coil according to the number of secondary end turns. The present application calculates the average magnetic path length and the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil, and calculates the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability; the parameters of the magnetic coupling coil can be reasonably configured, and energy can be effectively obtained from the power grid to provide a stable power supply for detection or communication equipment in the power grid, and the magnetic coupling coil can be made more reliable while meeting the power requirements.

[0113] In one embodiment, the present application provides a magnetic coupling coil optimization device, such as Figure 2 As shown, Figure 2 A schematic diagram of the structure of a magnetic coupling coil optimization device provided in an embodiment of the present application, the device comprising:

[0114] A first calculation module 201 is used to calculate the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil;

[0115] A second calculation module 202, configured to calculate an effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil;

[0116] A third calculation module 203, configured to calculate the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability;

[0117] The optimization module 204 is used to optimize the magnetic coupling coil according to the number of secondary end turns.

[0118] In one embodiment, the first calculation module 201 is also used to: calculate the inner diameter and outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil; calculate the average magnetic path length of the magnetic coupling coil according to the inner diameter and outer diameter of the magnetic coupling coil; calculate the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil and the average magnetic path length.

[0119] Among them, in one embodiment, before calculating the inner diameter and outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil, it is also necessary to compare the core parameters of different materials to determine the material of the magnetic core. Specifically, a material with a large initial magnetic permeability and saturation magnetic induction intensity is selected as the coil core material. According to the wire diameter of the actual high-voltage line, and considering factors such as the thickness of the core protective box, the thickness of the winding, the thickness of the inner layer of the core fixed structure, and the thickness of the clamping structure between the cable and the energy extraction coil, the inner diameter length of the magnetic coupling coil is determined to make the inner diameter length of the magnetic coupling coil as small as possible.

[0120] Specifically, after determining the inner diameter of the magnetic coupling coil, it is also necessary to determine the outer diameter of the magnetic coupling coil, and the outer diameter of the magnetic coupling coil is calculated based on the saturation excitation current of the magnetic coupling coil. The first calculation module 201 is also specifically used for:

[0121] The outer diameter of the magnetic coupling coil is calculated according to the saturation excitation current of the magnetic coupling coil and the following saturation excitation current calculation formula:

[0122]

[0123] Among them, I umax is the saturation excitation current of the magnetic coupling coil, B s is the saturation magnetic induction intensity of the magnetic coupling coil, u0 is the vacuum magnetic permeability of the magnetic coupling coil, u r is the relative magnetic permeability of the magnetic core when it is not cut, D is the outer diameter of the magnetic coupling coil, and d is the inner diameter of the magnetic coupling coil.

[0124] Wherein, the saturation excitation current of the magnetic coupling coil is equal to the primary current.

[0125] Specifically, after determining the inner diameter and outer diameter of the magnetic coupling coil, the average magnetic path length of the magnetic coupling coil can be determined. Specifically, the average magnetic path length of the magnetic coupling coil is the sum of the inner diameter, outer diameter, and height of the magnetic coupling coil. The height of the magnetic coupling coil can be directly measured after determining the inner diameter and outer diameter.

[0126] Specifically, in order to facilitate the installation of the CT energy extraction device on the high-voltage line, the magnetic coupling coil needs to be made into an open type, so an air gap is inevitably introduced. Although the air gap can effectively prevent saturation, the air gap has a relatively large impact on the magnetic permeability of the magnetic core. The cross section of the magnetic core should be polished smooth and the length of the air gap should be reduced as much as possible. After the influence of the air gap, the magnetic permeability of the magnetic coupling coil is the equivalent magnetic permeability of the magnetic coupling coil.

[0127] Specifically, after determining the average magnetic path length of the magnetic coupling coil, the first calculation module 201 can calculate the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil and the average magnetic path length. The calculation of the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil and the average magnetic path length includes:

[0128] The equivalent magnetic permeability of the magnetic coupling coil is calculated according to the air gap length of the magnetic coupling coil, the average magnetic path length and the following formula:

[0129]

[0130] Wherein, μ represents the equivalent magnetic permeability of the magnetic coupling coil, u r Indicates the relative magnetic permeability of the core when it is not cut, l g represents the air gap length of the magnetic coupling coil, and l represents the average magnetic path length of the magnetic coupling coil.

[0131] In one embodiment, when the current is relatively small, the cross-sectional area of ​​the magnetic core that meets the output power requirement can be obtained based on the current fluctuation range of the high-voltage line and the output power formula of the magnetic coupling coil, that is, the power requirement of the reference load. The second calculation module 202 is specifically used to:

[0132] The effective cross-sectional area of ​​the magnetic coupling coil is calculated according to the equivalent magnetic permeability, the power of the magnetic coupling coil and the following power formula:

[0133]

[0134] Among them, P represents the power of the magnetic coupling coil, U2 represents the output voltage of the magnetic coupling coil, R represents the load resistance, f represents the frequency of the primary current, I1 represents the primary current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, l represents the average magnetic path length of the magnetic coupling coil, and μ represents the equivalent magnetic permeability of the magnetic coupling coil.

[0135] In one embodiment, after the second calculation module 202 determines the effective cross-sectional area of ​​the magnetic coupling coil, the third calculation module 203 can determine the number of secondary end turns of the magnetic coupling coil according to the following formula:

[0136]

[0137] Among them, P represents the power of the magnetic coupling coil, U2 represents the output voltage of the magnetic coupling coil, R represents the load resistance, f represents the frequency of the primary current, I1 represents the primary current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, l represents the average magnetic path length of the magnetic coupling coil, μ represents the equivalent magnetic permeability of the magnetic coupling coil, and N2 represents the number of turns at the secondary end.

[0138] If and only if the number of turns N2 at the secondary end of the coil satisfies When , the coil output power reaches the maximum, and the formula for k is:

[0139]

[0140] f represents the frequency of the primary-end current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, and μ represents the equivalent magnetic permeability of the magnetic coupling coil.

[0141] In one embodiment, the magnetic coupling coil is mounted on the transmission line, and the interference is relatively serious. Therefore, the optimization module 204 is used to optimize the secondary end turns and the winding method of the magnetic coupling coil. First, the turn density and cross-sectional area are kept uniform, which can eliminate or effectively reduce the influence of the parallel component of the interference magnetic field and the relative position change between the wire and the coil; second, a loop is wound in the center of the frame in the opposite direction of the coil, which can eliminate or effectively reduce the influence of the vertical component of the interference magnetic field.

[0142] like Figure 3 As shown in FIG. 1 , in one embodiment, it is an internal structure diagram of a computer device. The computer device may be a magnetic coupling coil optimization device, or a terminal or server connected to a magnetic coupling coil optimization device. Figure 3As shown, the computer device includes a processor, a memory, and a network interface connected via a system bus. The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program. When the computer program is executed by the processor, the processor may implement a magnetic coupling coil optimization method. The internal memory may also store a computer program. When the computer program is executed by the processor, the processor may implement a magnetic coupling coil optimization method. The network interface is used to communicate with an external device. Those skilled in the art will understand that Figure 3 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0143] In one embodiment, a magnetic coupling coil optimization method provided by the present application can be implemented in the form of a computer program. The computer program can be Figure 3 The computer device shown in the figure is run. The memory of the computer device can store various program templates constituting the line lightning protection effect evaluation device, such as the first calculation module 201, the second calculation module 202, the third calculation module 203, and the optimization module 204.

[0144] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the following steps: calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil; calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil; calculating the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability; and optimizing the magnetic coupling coil according to the number of secondary end turns.

[0145] In one achievable manner, the magnetic coupling coil is an open-type winding.

[0146] In one feasible manner, the calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil includes: calculating the inner diameter and the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil; calculating the average magnetic path length of the magnetic coupling coil according to the inner diameter and the outer diameter of the magnetic coupling coil; and calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil and the average magnetic path length.

[0147] In one achievable manner, calculating the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil includes: calculating the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil and the following saturation excitation current calculation formula:

[0148]

[0149] Among them, I umax is the saturation excitation current of the magnetic coupling coil, B s is the saturation magnetic induction intensity of the magnetic coupling coil, u0 is the vacuum magnetic permeability of the magnetic coupling coil, u r is the relative magnetic permeability of the magnetic core when it is not cut, D is the outer diameter of the magnetic coupling coil, and d is the inner diameter of the magnetic coupling coil.

[0150] In an achievable manner, calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil includes: calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability, the power of the magnetic coupling coil and the following power formula:

[0151]

[0152] Among them, U2 represents the output voltage of the magnetic coupling coil, R represents the load resistance, f represents the frequency of the primary current, I1 represents the primary current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, l represents the average magnetic path length of the magnetic coupling coil, and μ represents the equivalent magnetic permeability of the magnetic coupling coil.

[0153] In one achievable manner, the method further includes: designing an anti-shock module according to the power of the magnetic coupling coil, the anti-shock module being connected to the output end of the magnetic coupling coil, and the anti-shock module being used to protect the circuit connected to the magnetic coupling coil.

[0154] In one achievable manner, the method further includes: designing an overvoltage protection module according to the output voltage of the magnetic coupling coil, the overvoltage protection module being connected to the output end of the magnetic coupling coil, and the overvoltage protection module being used to protect the circuit connected to the magnetic coupling coil.

[0155] A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor executes the following steps: calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil; calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil; calculating the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability; and optimizing the magnetic coupling coil according to the number of secondary end turns.

[0156] In one achievable manner, the magnetic coupling coil is an open-type winding.

[0157] In one feasible manner, the calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil includes: calculating the inner diameter and the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil; calculating the average magnetic path length of the magnetic coupling coil according to the inner diameter and the outer diameter of the magnetic coupling coil; and calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil and the average magnetic path length.

[0158] In one achievable manner, calculating the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil includes: calculating the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil and the following saturation excitation current calculation formula:

[0159]

[0160] Among them, I umax is the saturation excitation current of the magnetic coupling coil, B s is the saturation magnetic induction intensity of the magnetic coupling coil, u0 is the vacuum magnetic permeability of the magnetic coupling coil, u r is the relative magnetic permeability of the magnetic core when it is not cut, D is the outer diameter of the magnetic coupling coil, and d is the inner diameter of the magnetic coupling coil.

[0161] In an achievable manner, calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil includes: calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability, the power of the magnetic coupling coil and the following power formula:

[0162]

[0163] Among them, U2 represents the output voltage of the magnetic coupling coil, R represents the load resistance, f represents the frequency of the primary current, I1 represents the primary current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, l represents the average magnetic path length of the magnetic coupling coil, and μ represents the equivalent magnetic permeability of the magnetic coupling coil.

[0164] In one achievable manner, the method further includes: designing an anti-shock module according to the power of the magnetic coupling coil, the anti-shock module being connected to the output end of the magnetic coupling coil, and the anti-shock module being used to protect the circuit connected to the magnetic coupling coil.

[0165] In one achievable manner, the method further includes: designing an overvoltage protection module according to the output voltage of the magnetic coupling coil, the overvoltage protection module being connected to the output end of the magnetic coupling coil, and the overvoltage protection module being used to protect the circuit connected to the magnetic coupling coil.

[0166] A person skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0167] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A magnetic coupling coil optimization method, characterized in that: The method comprises: Calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil includes: calculating the inner diameter and the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil, and calculating the outer diameter of the magnetic coupling coil according to the saturation excitation current of the magnetic coupling coil and the following saturation excitation current calculation formula: Among them, I umax is the saturation excitation current of the magnetic coupling coil, B s is the saturation magnetic induction intensity of the magnetic coupling coil, u0 is the vacuum magnetic permeability of the magnetic coupling coil, u r is the relative magnetic permeability when the magnetic core is not cut, D is the outer diameter of the magnetic coupling coil, and d is the inner diameter of the magnetic coupling coil; the average magnetic path length of the magnetic coupling coil is calculated according to the inner diameter and the outer diameter of the magnetic coupling coil; the equivalent magnetic permeability of the magnetic coupling coil is calculated according to the air gap length of the magnetic coupling coil and the average magnetic path length; Calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil includes: calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability, the power of the magnetic coupling coil and the following power formula: Wherein, P represents the power of the magnetic coupling coil, U2 represents the output voltage of the magnetic coupling coil, R represents the load resistance, f represents the frequency of the primary current, I1 represents the magnitude of the primary current, A represents the effective cross-sectional area of ​​the magnetic coupling coil, l represents the average magnetic path length of the magnetic coupling coil, and μ represents the equivalent magnetic permeability of the magnetic coupling coil; Calculating the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability; The magnetic coupling coil is optimized according to the number of turns of the secondary end.

2. The method according to claim 1, characterized in that The magnetic coupling coil is an open-type winding.

3. The method according to claim 1, characterized in that The method further comprises: An anti-shock module is designed according to the power of the magnetic coupling coil. The anti-shock module is connected to the output end of the magnetic coupling coil. The anti-shock module is used to protect the circuit connected to the magnetic coupling coil.

4. The method according to claim 1, further comprising: An overvoltage protection module is designed according to the output voltage of the magnetic coupling coil. The overvoltage protection module is connected to the output end of the magnetic coupling coil. The overvoltage protection module is used to protect the circuit connected to the magnetic coupling coil.

5. A magnetic coupling coil optimization device, characterized in that: The device is used to perform the magnetic coupling coil optimization method according to any one of claims 1 to 4, and the device comprises: A first calculation module, used for calculating the equivalent magnetic permeability of the magnetic coupling coil according to the air gap length of the magnetic coupling coil; A second calculation module, used for calculating the effective cross-sectional area of ​​the magnetic coupling coil according to the equivalent magnetic permeability and the power of the magnetic coupling coil; A third calculation module, used for calculating the number of secondary end turns of the magnetic coupling coil according to the effective cross-sectional area and the equivalent magnetic permeability; An optimization module is used to optimize the magnetic coupling coil according to the number of secondary end turns.

6. A computer device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method according to claims 1 to 4.

7. A computer-readable storage medium, characterized in that: A computer program is stored, and when the computer program is executed by a processor, the processor is caused to execute the steps of the method according to claims 1 to 4.

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