A device and method for measuring the spatial distribution of tip-plate corona current based on concentric multi-ring plate electrodes

Abstract

The present invention discloses a device for measuring the spatial distribution of point-plate corona current based on concentric multi-ring plate electrodes, belonging to the field of corona current measurement. The device disassembles a ground plate electrode into concentric ring electrodes of different radii to measure the discharge current of different ring electrode combinations, thereby obtaining the spatial distribution of the corona current. In addition, the peak characteristics of the first peak are extracted based on the current waveforms on different single rings, and the ring radius at which the current waveform peak is zero is determined, which is the maximum radius for measuring the corona current using the plate electrode. Based on this, the present invention establishes a multivariate linear regression model when the point-plate discharge gap size and electric field strength are known, which is used to determine the maximum electrode radius required for the ground plate electrode in actual measurement. This provides a simple and low-cost solution for optimizing the size of the ground plate electrode required in short-gap point-plate corona discharge, and can be used to guide the size of the ground plate electrode required for measuring corona current in engineering.

Description

Technical Field

[0001] The present invention belongs to the field of corona current measurement, and more specifically, relates to a device and method for measuring the spatial distribution of tip-plate corona current based on concentric multi-ring plate electrodes. Background Art

[0002] Corona discharge is a common phenomenon in high-voltage electrical equipment. As a form of non-equilibrium plasma discharge, it also plays an important role in the field of gas discharge and is widely used in various industrial fields. Many applications of corona discharge are still in the exploratory stage, and a deeper understanding of its mechanisms and characteristics is needed to further promote its application. Common corona discharge measurements mainly include electrical pulses, light, audible noise, and electromagnetic radiation.

[0003] Reference 1 (Ogliari, M. Sakwa, J. Wei, W. Liu, B. Schubert, and M. Palo, “General Machine Learning-Based Approach to Pulse Classification for Separation of Partial Discharges and Interference,” IEEE Sensors Journal, vol. 23, no. 21, pp. 26839–26849) studies online monitoring and interference filtering of partial discharge signals in high-voltage electrical equipment. Reference 2 (H.I. Uckol, “Identification of corona discharges based on wavelet scalogram images with deep convolutional neural networks,” Electric Power Systems Research, vol. 224, p. 109712) describes a method for automatically identifying positive and negative DC corona discharge current pulses using wavelet transform images and deep convolutional neural networks. Reference 3 (R. Sasamoto, A. Shirouzu, H. Orii, M. Hanai, and M. Shinohara, “Estimation of electric field distribution of Hermstein's glowcorona discharge by spectral image processing,” Jpn. J. Appl. Phys., vol. 62, no. 1, p. 016006) uses spectral image processing technology to obtain the spatial distribution of the electric field and gas temperature of corona discharge. Reference 4 (W. He et al., “Positive corona discharge and acoustic characteristics of stranded conductor under low air pressure and different humidities,” Electric Power Systems Research, vol. 225, p. 109853) studies the positive DC corona discharge and acoustic characteristics of a stranded conductor.Reference 5 (Z. Xu and G. Hei, “Rectangular Spiral Antenna With a Hilbert Unit for Detecting Corona Discharge in Overhead Lines,” IEEE Sensors Journal, vol. 21, no. 2, pp. 930–936) presents a novel miniaturized antenna for detecting corona discharge in overhead lines. These methods typically require complex experimental setups, fail to investigate and determine the spatial distribution of corona currents, and involve machine learning, which requires extensive data processing.

[0004] Patent publication number CN117368590A, "A Method, Apparatus, Medium, and Equipment for Determining Corona Noise in High-Voltage Lines," describes a method and apparatus for measuring corona noise in high-voltage lines, focusing on the acoustic characteristics and noise level of the corona current. Patent publication number CN113740678A, "A Noise Reduction Method and System for Corona Current Measurement Data," describes a noise reduction technology for corona current measurement data, focusing on signal processing and interference elimination. Patent publication number CN209728031U, "A Corona Current Measuring Device," studies the impact of haze on corona current, simulating haze environments and recovering the haze. Patent publication number CN107390012A, "A Portable High-Voltage DC Corona Current Measurement Sensor," describes a squirrel-cage corona current sensor. The patent publication number CN106093733A, "A device for measuring corona current and a method for locating multi-point corona current using the same, uses a tunneling magnetoresistive magnetic field sensor," for corona current positioning, focusing on the positioning of corona discharge points and the measurement of magnetic field signals.

[0005] It can be seen that the existing methods have not solved the measurement problem of multi-physical fields (particle flow field and electromagnetic field) and port circuit coupling, and thus cannot realize the measurement of the spatial distribution of corona. Summary of the Invention

[0006] In response to the above defects or improvement needs of the prior art, the present invention provides a tip-plate corona current spatial distribution measurement device and method based on concentric multi-ring plate electrodes, which utilizes a grounded plate electrode composed of multiple concentric rings to realize the spatial distribution measurement of corona current, solving the measurement problem of multi-physical fields (particle flow field and electromagnetic field) and port circuit coupling.

[0007] To achieve the above object, according to a first aspect of the present invention, there is provided a device for measuring the spatial distribution of a tip-plate corona current based on concentric multi-ring plate electrodes, comprising: a high-voltage tip electrode, a ground plate electrode, a sampling resistor, and a current acquisition device;

[0008] The high-voltage tip electrode and the ground plate electrode are both fixed on the insulating material;

[0009] The ground plate electrode includes a cylindrical electrode located in the center and N concentric ring electrodes; the multiple concentric ring electrodes surround the cylindrical electrode in sequence from the inside to the outside, so that the ground plate electrode as a whole is in the shape of a circular plate; wherein there are air gaps between the cylindrical electrode and its adjacent ring electrodes, and between adjacent ring electrodes; the height of the cylindrical electrode and the multiple concentric ring electrodes are equal;

[0010] One end of the sampling resistor is connected to the electrode to be measured, and the other end is grounded; all electrodes in the grounding plate electrode except the electrode to be measured are directly grounded;

[0011] The current acquisition device is used to collect the corona discharge current on the sampling resistor to obtain the corona current of the electrode to be tested;

[0012] The electrode to be measured is the cylindrical electrode or the nth ring electrode, n=1, 2, ..., N, N>1; the corona currents of the cylindrical electrode and each ring electrode constitute a corona current spatial distribution.

[0013] According to a second aspect of the present invention, a method for measuring the spatial distribution of tip-plate corona current based on concentric multi-ring plate electrodes is provided, which is applied to the measuring device as described in the first aspect, comprising:

[0014] S1, connect the electrode to be measured to the sampling resistor, connect all electrodes except the electrode to be measured in the grounding plate to the ground, and connect the high-voltage tip electrode to the high voltage;

[0015] S2, when the corona discharge is stable, collects the corona discharge current on the sampling resistor to obtain the corona current of the electrode to be tested;

[0016] S3, repeating S1-S2 until the corona current of the cylindrical electrode and each ring electrode is obtained, forming a corona current spatial distribution.

[0017] According to a third aspect of the present invention, a method for obtaining the radius of a ground plate electrode in a short-gap tip-plate corona discharge measurement device is provided, comprising:

[0018] The corona currents of the cylindrical electrode and the ring electrodes in the device according to the first aspect are measured under multiple different combinations of discharge gaps and applied voltages, and the outer ring radius of the electrode where the first peak current of the corona current is negative, the corresponding discharge gap, and the applied voltage are fitted to obtain the relationship between the radius R of the ground plate electrode, the discharge gap d, and the average electric field E: R=C1+C2d+C3E+C4dE; wherein C1 to C4 are fitting coefficients;

[0019] Substituting the discharge gap and average electric field in the short-gap tip-plate corona discharge measuring device into the formula R=C1+C2d+C3E+C4dE, the radius of the ground plate electrode of the short-gap tip-plate corona discharge measuring device is obtained.

[0020] According to a fourth aspect of the present invention, a short-gap tip-plate corona discharge measurement device includes: a high-voltage tip electrode, a ground plate electrode, a sampling resistor and a current acquisition device, wherein the radius R of the ground plate electrode is obtained using the radius acquisition method described in the third aspect.

[0021] According to a fifth aspect of the present invention, there is provided an electronic device comprising: a computer-readable storage medium and a processor;

[0022] The computer-readable storage medium is used to store executable instructions;

[0023] The processor is configured to read the executable instructions stored in the computer-readable storage medium and execute the method according to the second aspect or the third aspect.

[0024] According to a sixth aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to execute the method as described in the second aspect or the third aspect.

[0025] According to a seventh aspect of the present invention, there is provided a computer program product comprising a computer program or instructions, which, when executed by a processor, implement the method as described in the second or third aspect.

[0026] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0027] 1. The present invention provides a device and method for measuring the spatial distribution of corona current based on concentric multi-ring plate electrodes. The grounded plate electrode plate is disassembled into concentric ring electrodes of different radii. By measuring the discharge current of different ring electrode combinations, the spatial distribution of the corona current received by the plate electrode can be studied, and the influence of the plate electrode size on the port current can be further studied. Compared with traditional corona discharge current measurement devices and methods, the present invention can more comprehensively reflect the current distribution within the discharge space. Traditional devices and methods usually only measure the current on the entire grounded plate electrode, while the device and method provided by the present invention can measure the current at different positions on the electrode. Secondly, the present invention can effectively distinguish between transport current and displacement current, and can provide a deeper understanding of the discharge mechanism. Finally, the present invention implements a measurement verification method for field-circuit coupling problems.

[0028] 2. Considering that the outermost single ring electrode with a radius of R has a phenomenon of zero port current, it can be considered that the corona current obtained by measuring the plate electrode with a corresponding radius of R at this moment is close to stable, and there is no need to increase the radius to measure the corona current; that is, the peak characteristic of the first peak is extracted according to the current waveform on different single rings, and the ring radius at which the current waveform peak is zero is determined, which is the maximum radius for measuring the corona current using the plate electrode; based on this, the present invention has established a multiple linear regression model under the condition of known discharge gap size and electric field intensity, and is used to calculate the maximum electrode radius required for the grounding plate electrode measuring the corona current according to the discharge gap and electric field intensity during actual measurement, and provides a simple and low-cost solution for optimizing the grounding plate electrode size required in the short gap tip-plate corona discharge, and can be used for guiding the grounding plate electrode size needed when measuring the corona current in engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 One of the schematic diagrams of the tip-plate corona current spatial distribution measurement device based on concentric multi-ring plate electrodes provided in an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of a ground plate electrode provided in an embodiment of the present invention;

[0031] Figure 3 Schematic diagram of the second device for measuring the spatial distribution of corona current based on concentric multi-ring plate electrodes according to an embodiment of the present invention;

[0032] Figure 4 A schematic diagram of a positive polarity discharge current waveform provided by an embodiment of the present invention; Figure 4 (a) is a schematic diagram of the current waveform of different combinations of rings. Figure 4 (b) is a schematic diagram of the current waveform of a single ring with different radii;

[0033] Figure 5 A schematic diagram of the ratio of the average value of the first peak to the peak value of a single ring band to the average value of the first peak to the peak value of all ring bands provided in an embodiment of the present invention;

[0034] Figure 6 Schematic diagram of the actual and predicted values ​​of electrode radius. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining 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 may be combined with each other as long as they do not conflict with each other.

[0036] The embodiment of the present invention provides a device for measuring the spatial distribution of tip-plate corona current based on concentric multi-ring plate electrodes, such as Figure 1 As shown, it includes: a high-voltage tip electrode, a ground plate electrode, a sampling resistor and a current acquisition device;

[0037] The high-voltage tip electrode and the ground plate electrode are both fixed on the insulating material;

[0038] The grounding plate electrode includes a cylindrical electrode located in the center and N concentric ring electrodes; the multiple concentric ring electrodes surround the cylindrical electrode in sequence from the inside to the outside, so that the grounding plate electrode as a whole is in the shape of a circular plate; wherein, there are air gaps between the cylindrical electrode and its adjacent ring electrodes, and between adjacent ring electrodes, to achieve mutual insulation between the cylindrical electrode and the multiple concentric electrode rings; the height of the cylindrical electrode and the multiple concentric ring electrodes are equal;

[0039] One end of the sampling resistor is connected to the electrode to be measured, and the other end is directly grounded; all electrodes in the grounding plate electrode except the electrode to be measured are directly grounded;

[0040] The current acquisition device is used to collect the corona discharge current on the sampling resistor to obtain the corona current of the electrode to be tested;

[0041] The electrode to be measured is the cylindrical electrode or the nth ring electrode, n=1, 2, ..., N, N>1; the corona currents of the cylindrical electrode and each ring electrode constitute a corona current spatial distribution.

[0042] For ease of calculation, preferably, the difference between the inner diameter and the outer diameter of each ring electrode is equal.

[0043] To facilitate the processing of the ground plate electrode, preferably, the widths of the air gaps between the cylindrical electrode and its adjacent ring electrodes, and between adjacent ring electrodes are equal.

[0044] Specifically, the plate electrode with a radius of R is replaced by independent concentric multi-ring electrodes. The radius of the multi-ring electrodes combined is still R. By measuring the corona current on the port circuits on different ring electrodes, the spatial distribution of the corona current on the corresponding flat plate electrode with a radius of R can be obtained.

[0045] The ground plate electrode is connected to a sampling resistor, and the voltage waveform on the sampling resistor reflects the corona current waveform. The current acquisition device can be selected arbitrarily, such as an oscilloscope, in which case the high-voltage probe and the voltage probe on the sampling resistor are both connected to the oscilloscope.

[0046] like Figure 1As shown, both the high-voltage spike electrode and the ground plate electrode are fixed to an insulating material. The copper needle of the high-voltage spike electrode can be set to 1 mm in diameter. The ground plate electrode consists of a series of mutually insulated concentric aluminum rings. For example, the innermost cylindrical ring of the ground plate electrode has a base radius of 10 mm and a height of 8 mm. The difference between the inner and outer diameters of the remaining rings is 9 mm, and the height is 8 mm. The air gap between the rings is 1 mm.

[0047] In order to facilitate the subsequent introduction, the rings on the ground plate electrode are numbered respectively, such as Figure 2 As shown, from inside to outside they are A to F.

[0048] When measuring, the ring electrode to be measured can be grounded through a 50 ohm sampling resistor, while the other ring electrodes can be directly grounded, such as Figure 3 It is understood that if the current of a certain combination of ring electrodes needs to be measured, the wires of these ring electrodes are connected together and then grounded through a 50-ohm sampling resistor, and the ring electrodes not incorporated are directly grounded.

[0049] An embodiment of the present invention provides a method for measuring the spatial distribution of tip-plate corona current based on concentric multi-ring plate electrodes, which is applied to the measurement device described in the above embodiment, comprising:

[0050] S1, connect the electrode to be measured to the sampling resistor, connect all electrodes except the electrode to be measured in the grounding plate to the ground, and connect the high-voltage tip electrode to the high voltage;

[0051] S2, when the corona discharge is stable, collects the corona discharge current on the sampling resistor to obtain the corona current of the electrode to be tested;

[0052] S3, repeating S1-S2 until the corona current of the cylindrical electrode and each ring electrode is obtained, forming a corona current spatial distribution.

[0053] Specifically, the measurement process is as follows:

[0054] 1) Turn on the uninterruptible power supply and use it to power the oscilloscope.

[0055] 2) Adjust the discharge gap. Connect the high-voltage tip electrode to the high voltage, connect the ring electrode to be measured to the sampling resistor, and connect the other ring electrodes directly to the ground. (In the figure, the 50Ω resistor is connected to different ring electrodes or different ring electrode combinations, and the remaining electrodes are connected to the ground wire.)

[0056] 3) Turn on the control box power supply. Increase the voltage while observing the high-voltage tip electrode and the ground plate electrode. When the corona discharge stabilizes, record the voltage of the high-voltage tip electrode as displayed on the oscilloscope.

[0057] 4) Use an oscilloscope to capture the corona discharge current on the sampling resistor and save the data. To ensure data reliability, this step can be repeated three times.

[0058] The discharge gaps were set to 0.5cm, 1cm, 1.5cm, and 2cm, respectively. The applied voltages were 5.2kV, 8kV, 10kV, and 12kV, respectively. To further investigate the effect of different applied voltages on the results at the same discharge gap, data were also measured at a 1cm gap with an applied voltage of 6.4kV.

[0059] The current measurement results and the first peak-to-peak analysis are analyzed as follows:

[0060] Different grounding methods for the grounding plate electrode were measured three times for each case. Here, only one of the measurement results under a set of experimental parameters is plotted. When the discharge gap is 1.5 cm and the average electric field strength of the gap is 6.67 kV / cm (d = 1.5 cm, E = 6.67 kV / cm), the current waveforms of the rings with increasing numbers (ring A, ring AB, ring ABC, ring ABCD, ring ABCDE, ring ABCDEF) and a single ring (ring A, ring B, ring C, ring D, ring E, ring F) were measured, as shown in Figure 1. Figure 4 As shown in (a) and (b), it can be seen from the above measurement results that:

[0061] 1) First, we selected an experiment with increasing band combinations. We found that as the number of bands increases (equivalent to a larger measured corona flow area), the current peak first increases (A→AB), then decreases (AB→ABC), and then increases (ABCD→ABCDEF), but does not exceed the inner ring peak (AB). If the corona current is solely transport current, the peak value should increase with increasing electrode radius. This phenomenon suggests the presence of a corona current component (which can be considered a displacement current) traveling in the opposite direction and having a spatial distribution.

[0062] 2) Next, experiments with different single loops were performed. It was found that the peak currents measured on different single loops varied, and as the number of loops increased (equivalent to measuring the spatial distribution of the corona current on the electrode), the peak current gradually decreased (B→C→D), and even the first peak-to-peak value became negative (E→F). (The multi-peak waveform is due to the inductance of the measurement circuit; here, the first peak-to-peak value is used instead of the current peak value.)

[0063] 3) Repeated experiments confirmed the above-mentioned negative peak current phenomenon. The negative value is taken as the sign that the outer ring corona current of radius R is zero when it just appears. At this time, the plate electrode of the corresponding radius R measures the maximum corona current, which is taken as the value of the corona current. The radius R at this time is the plate electrode radius corresponding to a certain gap and the average strength of the external electric field.

[0064] 4) In order to overcome the influence of statistical errors in the experiment, we extracted the first peak value in the current waveform after a series of single-ring experiments. The average of the first peak value of the three repeated experiments was used as the first peak peak feature. The average of the first peak peak value of a single ring band was compared with the average of the first peak peak value of all ring bands. The results are as follows Figure 5 As shown, the intersection of the curve with 0 is defined as the current inflection point. Experiments in Groups 1-4 all have inflection points (red intersections). The inflection point in the experimental curve of Group 5 is obtained by extending the straight line between Rings E and F (green intersections). Knowing the actual size of each ring, we can convert the position of the ring number at the inflection point into the electrode radius through a simple mapping, as shown in Table 1.

[0065] Table 1 Radius of the electrode at the inflection point

[0066]

[0067] The measured results indicate that in short-gap tip-plate corona discharge experiments, the maximum ground electrode radius is equal to the electrode radius at the inflection point. The electrode radius, R, is related to two parameters: the discharge gap, d, and the average electric field, E. Multiple linear regression was used to fit the experimental data for Groups 1-4, as shown in Equation (1).

[0068] R=C1+C2d+C3E+C4dE (1)

[0069] Among them, C i is the coefficient.

[0070] The Python code performs the fitting. The least squares method is used to find a set of coefficients that minimizes the sum of the squared errors between the predicted and true values. The results are C1 = 3.9425, C2 = 0.86, C3 = 0.065, and C4 = 0.0075.

[0071] Substitute the experimental data of Group 1-5 into the equation and draw the following Figure 6 The fitting curve is shown.

[0072] The predicted values ​​for Group 5 are close to the true values, verifying the reliability of the fitting curve. This fitting function can be used to approximately calculate the radius of the reverse current inflection point in short-gap tip-plate corona discharge experiments and to determine the maximum required radius of the ground plate electrode.

[0073] It can be understood that the above-mentioned “short gap” is relative to engineering, and refers to a discharge gap of centimeters; in a tip-plate corona discharge device used in engineering applications, the discharge gap is usually at the meter level.

[0074] Based on the above analysis results, an embodiment of the present invention provides a method for obtaining the radius of a ground plate electrode in a short-gap tip-plate corona discharge measurement device, comprising:

[0075] The corona currents of the cylindrical electrode and the ring electrodes in the device described in the above embodiment were measured under multiple different combinations of discharge gaps and applied voltages. The outer ring radius of the electrode with the first negative peak current of the corona current, the corresponding discharge gap, and the applied voltage were fitted to obtain the relationship between the radius R of the ground plate electrode, the discharge gap d, and the average electric field E: R=C1+C2d+C3E+C4dE; wherein C1 to C4 are fitting coefficients;

[0076] Substituting the discharge gap and average electric field in the short-gap tip-plate corona discharge measuring device into the formula R=C1+C2d+C3E+C4dE, the radius of the ground plate electrode of the short-gap tip-plate corona discharge measuring device is obtained.

[0077] An embodiment of the present invention provides a short-gap tip-plate corona discharge measurement device, comprising: a high-voltage tip electrode, a ground plate electrode, a sampling resistor, and a current acquisition device. The radius R of the ground plate electrode is obtained using the radius acquisition method described in the above embodiment.

[0078] An embodiment of the present invention provides an electronic device, comprising: a computer-readable storage medium and a processor;

[0079] The computer-readable storage medium is used to store executable instructions;

[0080] The processor is configured to read the executable instructions stored in the computer-readable storage medium and execute the method described in any one of the above embodiments.

[0081] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to execute the method described in any of the above embodiments.

[0082] An embodiment of the present invention provides a computer program product, including a computer program or instructions, which implements the method described in any of the above embodiments when executed by a processor.

[0083] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for obtaining the radius of a ground plate electrode in a short-gap tip-plate corona discharge measurement device, the short-gap tip-plate corona discharge measurement device comprising: High-voltage tip electrode, ground plate electrode, sampling resistor and current acquisition device; The high-voltage tip electrode and the grounding plate electrode are both fixed on the insulating material; the grounding plate electrode includes a cylindrical electrode located in the center and N concentric ring electrodes; the N concentric ring electrodes surround the cylindrical electrode in sequence from the inside to the outside, so that the grounding plate electrode is in the shape of a circular plate as a whole; wherein, there is an air gap between the cylindrical electrode and its adjacent ring electrodes, and between adjacent ring electrodes; the height of the cylindrical electrode and the multiple concentric ring electrodes are equal; one end of the sampling resistor is connected to the electrode to be measured, and the other end is grounded; the electrodes in the grounding plate electrode except the electrode to be measured are directly grounded; the current acquisition device is used to collect the corona discharge current on the sampling resistor to obtain the corona current of the electrode to be measured; wherein, the electrode to be measured is the cylindrical electrode or the nth ring electrode, n=1,2,…,N, N>1; the corona current of the cylindrical electrode and each ring electrode constitutes the corona current spatial distribution; it is characterized in that the method comprises: The corona current of the cylindrical electrode and each ring electrode in the device was measured under multiple different combinations of discharge gaps and applied voltages, and the outer ring radius of the electrode with the first negative peak current of the corona current, the corresponding discharge gap and applied voltage were fitted to obtain the radius of the ground plate electrode. R and discharge gap d , average electric field E The relationship between ;in, C 1~ C 4 is the fitting coefficient; Substitute the discharge gap and average electric field in the short gap tip-plate corona discharge measurement device into the formula , and obtain the radius of the ground plate electrode of the short gap tip-plate corona discharge measurement device.

2. The radius acquisition method according to claim 1, wherein: The difference between the inner diameter and the outer diameter of each ring electrode of the short-gap tip-plate corona discharge measuring device is equal.

3. The radius acquisition method according to claim 1 or 2, characterized in that: The widths of the air gaps between the cylindrical electrode and its adjacent ring electrodes and between adjacent ring electrodes of the short-gap tip-plate corona discharge measuring device are all equal.

4. A short-gap tip-plate corona discharge measurement device comprising: High-voltage tip electrode, ground plate electrode, sampling resistor and current acquisition device, characterized in that the radius of the ground plate electrode R The radius is obtained by using the radius acquisition method described in any one of claims 1 to 3.

5. An electronic device, characterized in that: include: Computer-readable storage medium and processor; The computer-readable storage medium is used to store executable instructions; The processor is configured to read the executable instructions stored in the computer-readable storage medium and execute the radius acquisition method according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to execute the radius acquisition method according to any one of claims 1 to 3.

7. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the radius acquisition method according to any one of claims 1 to 3 is implemented.

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