Point-plate corona current spatial distribution measuring device and method based on concentric multi-ring plate electrode

Abstract

The invention discloses a tip-plate corona current spatial distribution measuring device based on a concentric multi-ring plate electrode, and belongs to the field of corona current measurement, and the device is characterized in that a grounding plate electrode is disassembled into concentric ring electrodes with different radiuses, and the measurement of discharge current of different ring electrode combinations is realized, so that corona current spatial distribution is obtained; besides, peak value characteristics of a first peak are extracted according to current waveforms on different single rings, and the ring radius with the peak value of the current waveforms being zero is determined, namely the maximum radius of the corona current measured by adopting the plate electrode; on the basis, under the condition that the tip-plate discharge gap size and the electric field intensity are known, a multiple linear regression model is established and used for determining the maximum electrode radius needed by the grounding plate electrode in actual measurement, and a simple, convenient and low-cost scheme is provided for optimizing the size of the grounding plate electrode needed in short-gap tip-plate corona discharge; and the method can be used for guiding the size of the grounding plate electrode required for measuring the corona current in engineering.

Description

Technical Field

[0001] The invention belongs to the field of corona current measurement, and more specifically, relates to a device and method for measuring the spatial distribution of a 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 occupies an important position in the field of gas discharge and is widely used in various industrial fields. Many corona discharge applications are still in the exploratory stage, and a deeper understanding of its mechanism and characteristics is needed to further promote the development of applications. Common corona discharge measurements are mainly 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 the online monitoring and interference filtering of partial discharge signals in high-voltage electrical equipment. Reference 2 (HIUckol, "Identification of corona discharges based on wavelet scalogram images with deep convolutional neural networks," Electric Power Systems Research, vol. 224, p. 109712) is a method for automatically identifying positive and negative DC corona discharge current pulses based on 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 split conductors.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) is a new miniaturized antenna for detecting corona discharge in overhead lines. These methods usually require complex experimental setups, and do not study and determine the spatial distribution of corona currents. In addition, machine learning requires a large amount of data processing.

[0004] The patent with publication number CN117368590A, "A method, device, medium and equipment for determining corona noise of high-voltage lines", is a method and equipment for measuring corona noise of high-voltage lines, focusing on the acoustic characteristics and noise level of corona current. The patent with publication number CN113740678A, "A noise reduction method and system suitable for corona current measurement data", is a noise reduction technology for corona current measurement data, focusing on signal processing and interference elimination of data. The patent with publication number CN209728031U, "A corona current measurement device", studies the impact of haze on corona current, can simulate haze environment and recycle haze. The patent with publication number CN107390012A, "A portable high-voltage DC corona current measurement sensor", is a corona current sensor with a squirrel cage structure. The patent with 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", performs 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 achieve the measurement of the spatial distribution of corona. Summary of the invention

[0006] In view of 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 realizes the spatial distribution measurement of corona current by utilizing a grounded plate electrode composed of multiple concentric rings, and solves 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 grounding plate electrode comprises a cylindrical electrode at 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 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;

[0010] 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;

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

[0015] S2, when the corona discharge is stable, collect 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] Under a plurality of different combinations of discharge gaps and applied voltages, the corona currents of the cylindrical electrode and the ring electrodes in the device as described in the first aspect are measured, and the outer ring radius of the electrode whose first peak current of the corona current is negative, and the corresponding discharge gap and applied voltage are fitted to obtain the relationship between the radius R of the grounding plate electrode and the discharge gap d and the average electric field E, R=C1+C2d+C3E+C4dE; wherein C1~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 comprises: 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 by 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 used to read the executable instructions stored in the computer-readable storage medium and execute the method as described in the second aspect or the third aspect.

[0024] According to a sixth aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for causing 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 aspect or the 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 device and method for measuring the spatial distribution of corona current based on concentric multi-ring plate electrodes provided by the present invention disassemble the grounding plate electrode plate 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 the traditional corona discharge current measurement device and method, the present invention can more comprehensively reflect the current distribution in the discharge space; the traditional device and method usually only measure the current on the entire grounding 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 have a deeper understanding of the discharge mechanism; finally, the present invention realizes the measurement verification method of the field-circuit coupling problem.

[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 measured by the plate electrode with a corresponding radius of R is close to stability, and there is no need to increase the radius to measure the corona current; that is, the peak characteristics of the first peak are extracted according to the current waveforms on different single rings, and the ring radius with a current waveform peak of 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 discharge gap size and the electric field strength are known, which is used to calculate the maximum electrode radius required for the grounding plate electrode for measuring the corona current according to the discharge gap and the electric field strength during actual measurement, and provides a simple and low-cost solution for optimizing the grounding plate electrode size required in short-gap tip-plate corona discharge, and can be used to guide the grounding plate electrode size required when measuring the corona current in engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 One of the schematic diagrams of a device for measuring the spatial distribution of a tip-plate corona current 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 A second schematic diagram of a device for measuring the spatial distribution of corona current based on concentric multi-ring plate electrodes provided in 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 current waveforms 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-peak value of a single ring band to the average value of the first peak-to-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 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.

[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 sharp electrode, a grounding plate electrode, a sampling resistor and a current collection device;

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

[0038] The grounding plate electrode comprises a cylindrical electrode located at 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 is in the shape of a circular plate as a whole; wherein there are air gaps between the cylindrical electrode and its adjacent ring electrodes, and between adjacent ring electrodes, so as to achieve mutual insulation between the cylindrical electrode and the multiple concentric electrode rings; the heights 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] Wherein, the electrode to be tested 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 the corona current spatial distribution.

[0042] For the convenience 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 mutually independent concentric multi-ring electrodes, and the radius of the multi-ring electrodes combined together 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 grounding plate electrode is connected to a sampling resistor for grounding, 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, and 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 on the insulating material. The copper needle diameter of the high-voltage spike electrode can be set to 1mm. The ground plate electrode consists of a series of concentric aluminum rings that are insulated from each other. For example, the radius of the innermost cylindrical bottom surface of the ground plate electrode is 10mm and the height is 8mm. The difference between the inner and outer diameters of the remaining rings is 9mm and the height is 8mm. The air gap between the rings is 1mm.

[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, one of the ring electrodes 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] The 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 measuring device as described in the above embodiment, comprising:

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

[0051] S2, when the corona discharge is stable, collect 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 tested 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 that are not connected are uniformly connected to the ground wire.)

[0056] 3) Turn on the power supply of the control box. Increase the voltage and observe the high-voltage tip electrode and the ground plate electrode at the same time. When the corona discharge is stable, record the voltage of the high-voltage tip electrode displayed by the oscilloscope.

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

[0058] The discharge gap was set to 0.5cm, 1cm, 1.5cm and 2cm respectively. The applied voltages were 5.2kV, 8kV, 10kV and 12kV respectively. In order to study the effect of different voltages on the results under the same discharge gap, the data of applying 6.4kV voltage was measured at a gap of 1cm.

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

[0060] Different grounding methods of grounding plate electrodes 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) in the figure, it can be seen from the above measurement results that:

[0061] 1) First, select the experiment with increasing annular band combinations. It can be found that as the number of annular bands increases (equivalent to the larger area of ​​the measured corona flow field), 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 only a transport current, the larger the electrode radius, the larger the peak value should be. The above phenomenon shows that there is a component of a corona current in the opposite direction (which can be considered as a displacement current) and it has a spatial distribution.

[0062] 2) Secondly, different single-loop experiments were selected. It can be found that the peak currents measured on different single-loops are different, and as the number of single-loops increases (equivalent to measuring the spatial distribution of the corona current on the electrode), the peak current gradually decreases (B→C→D), and even the first peak value becomes negative (E→F) (the multi-peak waveform is the influence of the inductance of the measurement circuit, and the first peak value is temporarily used here instead of the current peak value).

[0063] 3) Repeated experiments have proved the above-mentioned negative peak current phenomenon. When the negative value just appears, it is the sign that the corona current of the outer ring of radius R is zero. At this time, the corona current measured by the plate electrode of the corresponding radius R reaches the maximum, 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 the statistical error of 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 three repeated experiments was taken as the first peak value feature. The average of the first peak value of a single ring band was compared with the average of the first peak value of all ring bands. The results are as follows Figure 5 As shown, the intersection of the curve and 0 is defined as the current inflection point. The experiments of Group 1-4 all have inflection points (red intersection points). The experimental curve of Group 5 obtains the inflection point (green intersection point) by extending the straight line of ring E and ring F. Knowing the actual size of each ring band, we can convert the position of the ring band number at the inflection point into the radius size of the electrode through a simple mapping, and the results are shown in Table 1.

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

[0066]

[0067] From the measurement results, it can be seen that in the short gap tip-plate corona discharge experiment, the maximum value of the ground electrode radius is equal to the electrode radius at the inflection point. The electrode radius R is related to two parameters, namely the discharge gap d and the average electric field E. Multiple linear regression is used to fit the experimental data of Group 1-4, as shown in formula (1).

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

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

[0070] Use Python code to do the fitting. The least squares method is used to find a set of coefficients that minimizes the sum of square errors between the predicted value and the true value. We get C1 = 3.9425, C2 = 0.86, C3 = 0.065, C4 = 0.0075.

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

[0072] From the prediction results, the predicted value of the fitting function for Group 5 is close to the true value, which verifies the reliability of the fitting curve. This fitting function can approximately calculate the radius of the reverse current inflection point in the short gap tip-plate corona discharge experiment and is used to determine the maximum value required for the ground plate electrode radius.

[0073] It can be understood that the above-mentioned "short gap" is relative to engineering, and refers to the discharge gap being in the centimeter level; in the tip-plate corona discharge device used in engineering applications, the discharge gap is usually in 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] Under a plurality of different combinations of discharge gaps and applied voltages, the corona currents of the cylindrical electrode and the ring electrodes in the device described in the above embodiment are measured, and the outer ring radius of the electrode with the first peak current of the corona current being negative, and the corresponding discharge gap and applied voltage are fitted to obtain the relationship between the radius R of the grounding plate electrode and the discharge gap d and the average electric field E, R=C1+C2d+C3E+C4dE; wherein C1~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, wherein the radius R of the ground plate electrode is obtained by the radius acquisition method described in the above embodiment.

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

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

[0080] The processor is used to read the executable instructions stored in the computer-readable storage medium and execute the method described in any 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, and when the computer program or instructions are executed by a processor, the method described in any of the above embodiments is implemented.

[0083] It will be easily understood by those skilled in the art that the above description is only 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 protection scope of the present invention.

Claims

1. A device for measuring the spatial distribution of tip-plate corona current based on concentric multi-ring plate electrodes, characterized in that: include: High-voltage tip electrode, grounding plate electrode, sampling resistor and current collection device; The high-voltage tip electrode and the ground plate electrode are both fixed on the insulating material; The grounding plate electrode comprises a cylindrical electrode at 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 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 tested; Wherein, the electrode to be tested 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 the corona current spatial distribution.

2. The device according to claim 1, characterized in that The difference between the inner diameter and the outer diameter of each ring electrode is equal.

3. The device 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 are all equal.

4. A method for measuring the spatial distribution of corona current based on concentric multi-ring plate electrodes, applied to the measuring device according to any one of claims 1 to 3, characterized in that: include: S1, connect the electrode to be tested to the sampling resistor, connect all electrodes except the electrode to be tested in the grounding plate electrode to the ground, and connect the high-voltage tip electrode to the high voltage; S2, when the corona discharge is stable, collect the corona discharge current on the sampling resistor to obtain the corona current of the electrode to be tested; S3, repeating S1-S2 until the corona current of the cylindrical electrode and each ring electrode is obtained, forming a corona current spatial distribution.

5. A method for obtaining the radius of a ground plate electrode in a short-gap tip-plate corona discharge measurement device, characterized in that: include: Under a plurality of different combinations of discharge gaps and applied voltages, the corona currents of the cylindrical electrode and the ring electrodes in the device according to any one of claims 1 to 3 are measured, and the outer ring radius of the electrode whose first peak current of the corona current is negative, and the corresponding discharge gap and applied voltage are fitted to obtain the relationship between the radius R of the grounding plate electrode and the discharge gap d and the average electric field E: R=C1+C2d+C3E+C4dE; wherein C1~C4 are fitting coefficients; 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.

6. A short gap tip-plate corona discharge measurement device, comprising: A high-voltage spike electrode, a grounding plate electrode, a sampling resistor and a current acquisition device, wherein the radius R of the grounding plate electrode is obtained by using the radius acquisition method as described in claim 5.

7. An electronic device, characterized in that: include: A computer readable storage medium and a processor; The computer-readable storage medium is used to store executable instructions; The processor is used to read the executable instructions stored in the computer-readable storage medium and execute the method according to claim 4 or 5.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to cause a processor to execute the method according to claim 4 or 5.

9. 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 method according to claim 4 or 5 is implemented.

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