Design optimization method and system for three-phase cylindrical capacitive coupling mechanism structure

Abstract

The invention discloses a design optimization method and system for a three-phase cylindrical capacitive coupling mechanism structure, and relates to the technical field of sensors, and the method comprises the steps: designing a three-phase cylindrical capacitive coupling mechanism which comprises a coupling probe with two layers of copper sheets, a cylindrical pole plate and an insulating sheath; analyzing a distributed capacitance analytic expression of the three-phase cylindrical coupling mechanism, and optimizing the ground distance of a line where the coupling mechanism is installed; by establishing and verifying a three-phase line model, the interference source is added to simulate the influence of an external environment, and the anti-interference capability and the insulativity of the coupling mechanism are verified. According to the method, the structure of the coupling mechanism is designed and optimized, meanwhile, the influence of the three-phase line coupling mechanism on the change of the ground height is optimized, the electric field capturing capacity of the coupling mechanism is enhanced, and the three-phase cylindrical capacitance coupling mechanism structure has the advantages of being convenient to install, good in anti-interference capacity and insulativity and the like.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and in particular to a design optimization method and system for a three-phase cylindrical capacitor coupling mechanism structure. Background Art

[0002] In modern power systems, voltage measurement is of vital importance. However, traditional voltage transformers and mobile voltage sensors face many difficulties in practical applications. First of all, traditional voltage transformers usually require complex civil engineering projects to install, which not only consumes a lot of manpower and material resources, but may also cause long-term power outages and affect the normal operation of the power system. The complex installation process of civil engineering projects, expensive construction costs and corresponding maintenance work have greatly restricted the laying of voltage measurement points. In addition, for mobile voltage sensors, their design generally requires direct contact with power lines, but installation when energized requires technicians to work in a high-risk environment, which poses potential safety hazards. This requires voltage measurement equipment to have high insulation performance and ease of use to ensure safety while reducing work complexity.

[0003] Secondly, conventional capacitive coupling technology essentially relies on the degree of contact with the electric field, but due to the small size of the device and limited electric field capture capability, it is often difficult to maintain measurement accuracy under changing environmental conditions. In addition, this type of equipment also lacks stability analysis for external interference, resulting in the measurement results being susceptible to interference when charged objects approach, thus affecting its long-term reliability. As the power system gradually develops towards digitalization and intelligence, traditional voltage measurement equipment can no longer meet the growing technological needs, and the requirements for voltage sensors have become increasingly urgent. It is necessary to achieve high-precision measurement while avoiding cumbersome installation processes, while ensuring stable operation in complex environments. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by the present invention is that the existing voltage measurement method is complicated to install.

[0006] The measurement is inconvenient and susceptible to interference, and how to improve the accuracy and safety of voltage measurement by improving the coupling mechanism design.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure, comprising designing a three-phase cylindrical capacitor coupling mechanism, including a coupling probe with two layers of copper, a cylindrical electrode plate and an insulating outer skin; analyzing the distributed capacitance analytical formula of the three-phase cylindrical coupling mechanism, and optimizing the distance between the line where the coupling mechanism is installed and the ground; by establishing and verifying a three-phase line model, adding interference sources to simulate the influence of the external environment, and verifying the anti-interference ability and insulation of the coupling mechanism.

[0008] As a preferred solution of the design optimization method of the three-phase cylindrical capacitor coupling mechanism structure described in the present invention, wherein: the three-phase cylindrical capacitor coupling mechanism includes measuring the voltage of the overhead power line through the capacitor coupling principle.

[0009] As a preferred solution of the design optimization method of the three-phase cylindrical capacitor coupling mechanism structure described in the present invention, wherein: the three-phase cylindrical capacitor coupling mechanism also includes a power line, an end cover and a measurement circuit.

[0010] As a preferred solution of the design optimization method of the three-phase cylindrical capacitive coupling mechanism structure described in the present invention, the analytical formula for analyzing the distributed capacitance of the three-phase cylindrical coupling mechanism includes height, dielectric constant of the medium, ambient temperature and humidity.

[0011] As a preferred solution of the design optimization method of the three-phase cylindrical capacitor coupling mechanism structure described in the present invention, the optimized line-to-ground distance of the coupling mechanism installation includes calculating the distributed capacitance matrix of the line-to-ground distance of 1m, 3m and 6m respectively. As the line-to-ground distance increases, the equivalent capacitance values ​​of the line and the inner and outer layer coupling mechanisms to the ground gradually decrease, and the line-to-ground distance of the coupling mechanism installation is determined according to the level of the measured voltage.

[0012] As a preferred scheme of the design optimization method of the three-phase cylindrical capacitive coupling mechanism structure described in the present invention, wherein: the anti-interference ability of the verification coupling mechanism includes using a small metal ball as an interference source in a three-phase line model, and when a charged object approaches the input end of the circuit under test, capacitive coupling and interference occur.

[0013] As a preferred solution of the design optimization method of the three-phase cylindrical capacitor coupling mechanism structure described in the present invention, wherein: the verification of the insulation of the coupling mechanism includes using Comsol simulation, and when the maximum field strength between the conductor and the inner copper skin of the three-phase measurement structure at different heights is obtained to be lower than the corona initiation electric field of the line, no breakdown will occur between the conductor and the coupling mechanism.

[0014] Another object of the present invention is to provide a design optimization system for a three-phase cylindrical capacitor coupling mechanism structure, which can achieve non-contact voltage measurement with overhead power lines by designing a three-phase cylindrical capacitor coupling mechanism, including a coupling probe with two layers of copper, a cylindrical electrode plate and an insulating outer skin, thereby solving the problems of complex installation and inconvenient measurement in current voltage measurement technology.

[0015] As a preferred solution of the design optimization system of the three-phase cylindrical capacitor coupling mechanism structure described in the present invention, it includes: a coupling mechanism design module, a distributed capacitance optimization module, and a performance verification module; the coupling mechanism design module is used to design a three-phase cylindrical capacitor coupling mechanism, including a coupling probe with two layers of copper, a cylindrical electrode plate and an insulating outer skin, to achieve non-contact voltage measurement with overhead power lines; the distributed capacitance optimization module is used to analyze the distributed capacitance analytical expression of the three-phase cylindrical coupling mechanism, determine the line-to-ground distance where the coupling mechanism is installed, so as to optimize the distributed capacitance and improve the voltage measurement accuracy; the performance verification module is used to establish and verify a three-phase line model, add interference sources to simulate the influence of the external environment, and verify the anti-interference ability and insulation of the coupling mechanism.

[0016] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure.

[0017] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure.

[0018] Beneficial effects of the present invention: The design optimization method of the three-phase cylindrical capacitor coupling mechanism structure provided by the present invention can measure the voltage more accurately by adopting the coupling structure of the cylindrical pole plate. By adopting the coupling probe design containing two layers of copper skin, the double copper skin does not contact the metal of the line during measurement, thus avoiding poor contact and facilitating measurement. The double copper skin does not damage the surface structure of the line during installation, thus facilitating installation. By analyzing the distributed capacitance analytical formula of the three-phase cylindrical coupling mechanism, the distance between the line and the ground where the coupling mechanism is installed is optimized. Comprehensive environmental parameters such as height, dielectric constant of the medium, ambient temperature and humidity are taken into consideration. The influence of different installation heights on the capacitor coupling is accurately calculated, thereby optimizing the actual operating conditions and improving the anti-interference of the equipment. The stability of the ability and voltage measurement is improved by establishing and verifying the three-phase line model, adding interference sources to simulate the influence of the external environment, especially the approaching influence of charged objects, and verifying the anti-interference ability and insulation of the coupling mechanism. A small metal ball is used as an interference source, which can truly reflect the changes in electrical performance under different environments, ensure that the equipment always maintains good electrical performance in practical applications, and avoid measurement errors caused by external interference. Through Comsol simulation analysis, it is verified that the maximum field strength between the wire and the inner copper skin is within a safe range, and the three-phase measurement structure will not break down. It has good insulation and can improve the performance of the coupling structure. The present invention achieves better results in terms of efficiency, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 An overall flow chart of a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure provided in the first embodiment of the present invention.

[0021] Figure 2 A schematic diagram of a three-phase cylindrical coupling mechanism structure is provided for a design optimization method of a three-phase cylindrical capacitive coupling mechanism structure according to a first embodiment of the present invention.

[0022] Figure 3 A cylindrical coupling mechanism diagram of a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure provided in the first embodiment of the present invention.

[0023] Figure 4 A planar coupling mechanism diagram of a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure provided in the first embodiment of the present invention.

[0024] Figure 5 A potential distribution diagram of a three-phase cylindrical capacitor coupling mechanism structure design optimization method provided by the first embodiment of the present invention when there are adjacent conductors in the flat plate shape and the cylindrical shape.

[0025] Figure 6 An equivalent charge diagram of the outer copper layer of a three-phase line coupling mechanism using a mirror image method, according to a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure provided in the first embodiment of the present invention.

[0026] Figure 7 A diagram showing the relationship between the distributed capacitance of the outer copper layer of a horizontally arranged coupling mechanism and its height according to a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure provided in the first embodiment of the present invention.

[0027] Figure 8 A graph showing the relationship between the capacitance change rate and height of the outer copper skin of a horizontally arranged coupling mechanism according to a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure provided in the first embodiment of the present invention.

[0028] Fig. 9 A three-phase maximum field strength diagram (3 meters) after adding a coupling mechanism according to a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure provided in a second embodiment of the present invention.

[0029] Fig.10 A three-phase maximum field strength diagram (6 meters) after adding a coupling mechanism according to a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure provided in a second embodiment of the present invention.

[0030] Fig.11 A schematic diagram of a module of a design optimization system for a three-phase cylindrical capacitor coupling mechanism structure provided in accordance with a third embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0032] Example 1, reference Figure 1-Figure 8 , is an embodiment of the present invention, and provides a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure, comprising:

[0033] S1: Design a three-phase cylindrical capacitive coupling mechanism, including a coupling probe with two layers of copper, a cylindrical electrode plate and an insulating outer skin.

[0034] Furthermore, a three-phase cylindrical capacitive coupling mechanism measures the voltage of an overhead power line through the principle of capacitive coupling.

[0035] It should be noted that a three-phase cylindrical capacitive coupling mechanism, as Figure 2 shown, includes a coupling probe with two layers of copper sheets, a cylindrical electrode plate, an insulating outer skin, a power line, an end cover, and a measurement circuit.

[0036] It should also be noted that the voltage measurement of an overhead power line through the principle of capacitive coupling is affected by two parameters related to the non-contact voltage measurement accuracy and the coupling mechanism. The first is the coupling capacitance C 0 between the coupling mechanism and the power line, and the second is the capacitance C x to the ground formed by the coupling mechanism and the ground. The more stable these two parameters are, the higher the measurement accuracy. Moreover, the shape of the coupling mechanism is also a key factor. As Figure 3 and Figure 4 shown, the current coupling mechanism shapes applicable to power lines are cylindrical and flat plate-shaped. Through Comsol simulation, as Figure 5 shown, by comparing the coupling structures of the cylindrical and flat plate-shaped, it can be seen that the electric potential obtained by the cylindrical electrode plate in the cross-section of the wire is the same, and the electric potential is more uniform compared to the flat plate-shaped electrode plate. When there are adjacent conductors, the line coupling capacitance C 0 of the cylindrical electrode is more stable than that of the flat plate-shaped electrode. At the same time, the coupling mechanism is a design of a coupling probe with two layers of copper sheets. The double copper sheet structure has certain advantages in measurement and installation. During measurement, the double copper sheets do not contact the line metal, avoiding poor contact and facilitating measurement. During installation, the double copper sheets do not damage the surface structure of the line, facilitating installation.

[0037] S2: Analyze the distributed capacitance analytical formula of the three-phase cylindrical coupling mechanism and optimize the line-to-ground distance for the installation of the coupling mechanism.

[0038] Furthermore, analyzing the distributed capacitance analytical formula of the three-phase cylindrical coupling mechanism includes height, the dielectric constant of the medium, environmental temperature, and humidity.

[0039] In this embodiment, set the actual working conditions and erection on the three-phase line and the non-contact voltage measurement coupling mechanism. The height of the coupling device erected relative to the ground is 3m to 7m, the radius of the outer copper sheet is 39mm, and the phase distance is 60cm. In the actual model, the radius r, height h, and phase distance d should meet the conditions of r << h and r << d. Use the mirror method to calculate the capacitance matrix and based on the following boundary conditions:

[0040] (1) Except for the location of the outer copper sheet of the three-phase wire coupling mechanism, the Laplace operator of the electric potential in the space

[0041] (2) The electric potential on the surface of the conductor and on its infinitely distant boundary is assumed to be 0.

[0042] For the three-phase transmission line and the outer copper skin of the coupling mechanism, a spatially equivalent charge distribution model is established as follows: Figure 6 As shown, the radius of the outer copper skin of the three-phase line coupling mechanism is r, the phase distance of the line is d, the height of the three-phase line coupling mechanism to the ground is h, and the coordinates at this time are recorded as (0,0,h), and below the conductor plane (0,0,-h), the unit length charge τ distributed with the outer copper skin of the coupling mechanism of the three-phase line is placed. A , τ B , τ C Symmetrical charge per unit length - τ A , -τ B , -τ C , according to the superposition principle, the calculated capacitance matrix is ​​expressed as:

[0043]

[0044] in, are the potentials of the three-phase lines A, B, and C, respectively, and ε 0 is the vacuum dielectric constant, ε r is the relative dielectric constant.

[0045] Calculate the potential contribution corresponding to the charge of the three-phase lines A, B, and C, expressed as:

[0046]

[0047] Among them, α k1 is the potential coefficient; by calculating the potential contribution corresponding to the charge of the three-phase lines A, B, and C, we can get The potential coefficient in The capacitance coefficient in [β] = [α] -1 , expressed as:

[0048]

[0049] in,

[0050] calculate The capacitance coefficient matrix is ​​expressed as:

[0051]

[0052]

[0053] Where [C] is the capacitance matrix, is the relationship function of the three-phase potential, C Ax is the capacitance of phase a to ground, CBx is the capacitance of phase B to ground, C Cx is the capacitance of phase C to ground, C ij (i≠j) is the mutual capacitance between the A, B, and C phases.

[0054] According to formulas (1-2) and (1-3), it can be seen that the capacitance matrix is ​​related to the height and relative dielectric constant of the line.

[0055] 1. Relationship between distributed capacitance and height

[0056] The dielectric constant is the vacuum dielectric constant, that is, the relative dielectric constant ε r Under the condition that is 1, the relationship curve between distributed capacitance and height h is calculated according to equations (1-4) and (1-5) as follows: Figure 7 As shown in FIG. 1 , when the height increases from 3 m to 7 m, the capacitance between phase A and phase C decreases from 6.62 pF to 5.19 pF, the capacitance between phase B decreases from 4.97 pF to 3.88 pF, the mutual capacitance between phase A and phase B and the mutual capacitance between phase B and phase C increases from 5.59 pF to 5.99 pF, and the mutual capacitance between phase A and phase C decreases from 2.57 pF to 2.53 pF. Figure 8 As shown, the relative change rate of the capacitance to ground of phases A, B, and C is the largest, reaching 6% at the highest, that is, they are most affected by the height. The second is the maximum relative change rate of the mutual capacitance between phases A and C, which reaches 4%, while the mutual capacitance between phases A and B and the mutual capacitance between phases B and C are ≤1.43%, which are less affected by the height.

[0057] 2. Relationship between distributed capacitance and humidity

[0058] Dielectric constant ε r Determined by formula (1-6), it can be expressed as:

[0059]

[0060] Among them, P t is the total atmospheric pressure, ρ w is the relative humidity of the air, T is the atmospheric temperature, A', B' and C' are constants, and the constants A', B' and C' are in the range of 0 to 24 GHz, expressed as:

[0061]

[0062] In order to study the effect of relative humidity on relative dielectric constant, the temperature was set to 20℃ and the dielectric constant ε was calculated according to formula (1-6) under standard atmospheric pressure. r and relative humidity curve, dielectric constant ε at 20℃ rIt is linearly positively correlated with relative humidity. When the relative humidity increases from 0% to 100%, it increases by 0.0006, with an increase of 0.06%. It is known that the maximum change rate of relative dielectric constant is 0.3005%, so the change of relative humidity has little effect on the relative dielectric constant.

[0063] 3. Relationship between distributed capacitance and temperature

[0064] According to formulas (1-4) and (1-5), the relationship curve between the change rate of the relative dielectric constant of saturated moist air and temperature is calculated, where the calculated change rate is based on the capacitance value of 10°C. According to the actual working conditions on the three-phase line, when the temperature increases from 10°C to 50°C, the relative dielectric constant of saturated moist air with a relative humidity of 100% decreases from 1.0008 to 1.0006, and the maximum change rate, that is, the maximum change rate of capacitance, is 0.25%. Therefore, the influence of temperature changes on the relative dielectric constant is small.

[0065] Since humidity and temperature have little influence on distributed capacitance, this embodiment mainly analyzes distributed capacitance with different heights.

[0066] It should be noted that optimizing the line-to-ground distance for the installation of the coupling mechanism includes calculating the distributed capacitance matrices for line-to-ground distances of 1m, 3m and 6m respectively. As the line-to-ground distance increases, the equivalent capacitance values ​​of the line and the inner and outer layer coupling mechanisms to the ground gradually decrease. The line-to-ground distance for the installation of the coupling mechanism is determined based on the level of the measured voltage. The appropriate height can enhance the coupling mechanism's ability to capture the electric field.

[0067] When the line where the coupling mechanism is installed is 1m, 3m, and 6m away from the ground, the distributed capacitance matrix of each phase coupling mechanism is shown in Table 1-Table 3, and the unit is (F).

[0068] Table 1 Line is 1m from the ground

[0069]

[0070]

[0071] Continued

[0072]

[0073] Table 2 Line is 3m above the ground

[0074]

[0075]

[0076] Continued

[0077]

[0078] Table 3 Line is 6m above the ground

[0079]

[0080]

[0081] Continued

[0082]

[0083]

[0084] By calculating the distributed capacitance matrices of lines with a distance of 1m, 3m, and 6m to the ground, it can be seen from the data in Tables 1 to 3 that as the distance between the line and the ground increases, the equivalent capacitance of the line and the inner and outer layer coupling mechanisms to the ground gradually decreases, and is greatly affected by changes in height.

[0085] S3: By establishing and verifying the three-phase line model, adding interference sources to simulate the impact of the external environment, and verifying the anti-interference ability and insulation of the coupling mechanism.

[0086] Furthermore, verification of the anti-interference capability of the coupling mechanism includes using a small metal ball as an interference source in a three-phase line model. When a charged object approaches the input terminal of the circuit under test, capacitive coupling and interference occur.

[0087] It should be noted that verification of the insulation of the coupling mechanism includes Comsol simulation. When the maximum field strength between the conductor and the inner copper skin of the three-phase measurement structure at different heights is found to be lower than the corona initiation electric field of the line, no breakdown will occur between the conductor and the coupling mechanism.

[0088] Example 2, reference Figure 9-10 , which is an embodiment of the present invention, provides a design optimization method for a three-phase cylindrical capacitor coupling mechanism structure. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0089] First, in order to verify the anti-interference ability of the three-phase line model of the present invention, an interference source is added to the three-phase line model with the line 3m away from the ground, that is, a metal ball (aluminum, radius 3.9cm) is added to the space below the middle phase B to simulate the influence of the external environment, and the distributed capacitance matrices of the ball at a distance of 1m, 1.5m, 2m, and 2.5m from the middle phase coupling mechanism are made respectively. Due to the large amount of data in the distributed capacitance matrix, only the distributed capacitance matrix when the metal ball is 2.5m away from the line is displayed, as shown in Table 4, the unit is (F).

[0090] Table 4 The metal ball is 2.5m away from the line

[0091]

[0092]

[0093] Continued

[0094]

[0095]

[0096] Comparing Table 2 with Table 4, we can find that the 10*10 mutual capacitance matrix of the metal ball model and the 9*9 mutual capacitance matrix of the original three-phase line coupling mechanism model are added. Matlab is used to calculate the changes in the diagonal elements and non-diagonal elements of the two. The formula is as follows:

[0097]

[0098] Among them, r is the relative change rate between adding metal balls and not adding metal balls, C' ij is the capacitance value of the i-th row and j-th column of the mutual capacitance matrix after adding the metal ball, C ij is the capacitance value of the i-th row and j-th column corresponding to the mutual capacitance matrix without adding the original field of the metal ball.

[0099] After calculation, the relative change rate r is <0.1%, and the mutual capacitance values ​​of the two are at the same order of magnitude and change little. The simulation verifies that when adjacent conductors are close, the distributed capacitance value of the coupling mechanism is relatively stable, so the three-phase line model of the present invention has a certain anti-interference ability.

[0100] Next, in order to verify the insulation of the line and the coupling mechanism in the spatial domain, a simulation model of a three-phase line containing a cylindrical coupling mechanism was established in Comsol. By comparing the maximum field strength in the spatial domain between the line and the inner layer coupling mechanism with the line corona initiation critical value, it is possible to draw a conclusion on whether the coupling mechanism has broken down, thereby verifying its insulation performance.

[0101] When the line is 3m above the ground, the maximum field strength in the spatial domain between the line and the inner layer coupling mechanism is observed, and the electric field distribution of each phase is as follows: Fig. 9 As shown in Figure 2, when the three-phase line coupling mechanism is 6m away from the ground, the maximum field strength in the space domain between the line and the inner layer coupling mechanism is observed, and the electric field distribution of each phase is as follows: Fig.10 shown.

[0102] From the above simulation, we can see that the electric field modulus near the three-phase coupling mechanism is the largest. After adding the coupling mechanism, by analyzing the maximum field strength between the conductor and the inner copper skin at different heights, it is found that the maximum field strength is less than 1×10 6 V / m, which is lower than the starting field strength of corona discharge, so the three-phase line containing the cylindrical coupling mechanism will not break down and has good insulation performance.

[0103] In summary, the three-phase cylindrical capacitor coupling mechanism structure of the present invention has anti-interference capability and good insulation performance, so the present invention is creative.

[0104] Example 3, reference Fig.11 , as an embodiment of the present invention, provides a design optimization system for a three-phase cylindrical capacitor coupling mechanism structure, including a coupling mechanism design module, a distributed capacitance optimization module, and a performance verification module.

[0105] The coupling mechanism design module is used to design a three-phase cylindrical capacitor coupling mechanism, including a coupling probe with two layers of copper, a cylindrical electrode and an insulating outer skin, to achieve non-contact voltage measurement with overhead power lines; the distributed capacitance optimization module is used to analyze the distributed capacitance analytical formula of the three-phase cylindrical coupling mechanism, determine the line-to-ground distance where the coupling mechanism is installed, so as to optimize the distributed capacitance and improve the voltage measurement accuracy; the performance verification module is used to establish and verify the three-phase line model, add interference sources to simulate the impact of the external environment, and verify the anti-interference ability and insulation of the coupling mechanism.

[0106] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0107] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0108] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0109] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limited. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

[0110] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A design optimization method for a three-phase cylindrical capacitor coupling mechanism structure, characterized in that: include: A three-phase cylindrical capacitive coupling mechanism is designed, comprising a coupling probe with two layers of copper, a cylindrical electrode plate and an insulating outer skin; Analyze the distributed capacitance analytical formula of the three-phase cylindrical coupling mechanism and optimize the line-to-ground distance of the coupling mechanism installation; By establishing and verifying the three-phase line model, adding interference sources to simulate the impact of the external environment, the anti-interference ability and insulation of the coupling mechanism are verified.

2. The design optimization method of the three-phase cylindrical capacitor coupling mechanism structure as claimed in claim 1, characterized in that: The three-phase cylindrical capacitive coupling mechanism comprises measuring the voltage of the overhead power line through the capacitive coupling principle.

3. The design optimization method of the three-phase cylindrical capacitor coupling mechanism structure as claimed in claim 2, characterized in that: The three-phase cylindrical capacitive coupling mechanism also includes a power line, an end cover and a measurement circuit.

4. The design optimization method of the three-phase cylindrical capacitor coupling mechanism structure as claimed in claim 3, characterized in that: The analytical formula for analyzing the distributed capacitance of the three-phase cylindrical coupling mechanism includes height, dielectric constant of the medium, ambient temperature and humidity.

5. The design optimization method of the three-phase cylindrical capacitor coupling mechanism structure as claimed in claim 4, characterized in that: The optimization of the line-to-ground distance for the coupling mechanism installation includes calculating the distributed capacitance matrices of line-to-ground distances of 1m, 3m and 6m respectively. As the line-to-ground distance increases, the equivalent capacitance values ​​of the line and the inner and outer layer coupling mechanisms to the ground gradually decrease. The line-to-ground distance for the coupling mechanism installation is determined according to the level of the measured voltage.

6. The design optimization method of the three-phase cylindrical capacitor coupling mechanism structure as claimed in claim 5, characterized in that: The anti-interference capability of the coupling mechanism is verified by using a small metal ball as an interference source in a three-phase line model. When a charged object approaches the input end of the circuit under test, capacitive coupling and interference occur.

7. The design optimization method of the three-phase cylindrical capacitor coupling mechanism structure as claimed in claim 6, characterized in that: The verification of the insulation of the coupling mechanism includes, through Comsol simulation, when it is found that the maximum field strength between the conductor and the inner copper skin of the three-phase measurement structure at different heights is lower than the corona initiation electric field of the line, no breakdown will occur between the conductor and the coupling mechanism.

8. A system using the design optimization method of the three-phase cylindrical capacitor coupling mechanism structure as claimed in any one of claims 1 to 7, characterized in that: Including coupling mechanism design module, distributed capacitance optimization module, performance verification module; The coupling mechanism design module is used to design a three-phase cylindrical capacitive coupling mechanism, including a coupling probe with two layers of copper, a cylindrical plate and an insulating outer skin, to achieve non-contact voltage measurement with overhead power lines; The distributed capacitance optimization module is used to analyze the distributed capacitance analytical formula of the three-phase cylindrical coupling mechanism and determine the distance between the line where the coupling mechanism is installed and the ground, so as to optimize the distributed capacitance and improve the voltage measurement accuracy; The performance verification module is used to establish and verify a three-phase line model, add interference sources to simulate the influence of the external environment, and verify the anti-interference ability and insulation of the coupling mechanism.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the design optimization method of the three-phase cylindrical capacitive coupling mechanism structure according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the design optimization method of the three-phase cylindrical capacitive coupling mechanism structure described in any one of claims 1 to 7 are implemented.

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