Conductor corona discharge ultraviolet spectrum-based corona inception field intensity calculation method and system

Abstract

The invention discloses a corona inception field intensity calculation method and system based on a wire corona discharge ultraviolet spectrum, a storage medium and electronic equipment. The method comprises the following steps: establishing a wire corona inception field intensity discrimination test platform based on the ultraviolet spectrum; applying a voltage with a preset step length to the lead corona inception field intensity discrimination test platform to obtain ultraviolet maps under different voltage grades; processing the single-frame image of the ultraviolet spectrum under each voltage level, and obtaining a ratio of an ultraviolet region area to a full image region area corresponding to the single-frame image under each voltage level; and calculating a multi-frame image ratio of the ultraviolet light region of the multi-frame image to the full image under each voltage level based on a ratio of the ultraviolet light region area corresponding to the single-frame image to the full image region area, and determining the lead corona inception field intensity based on the multi-frame image ratio and the corresponding voltage level.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and more specifically, to a method and system for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge. Background Technology

[0002] To achieve large-scale resource allocation and ensure the sustained and stable development of the national economy, my country is currently vigorously developing a robust and intelligent power grid with ultra-high-voltage (UHV) power grids as the backbone and coordinated development of power grids at all levels, resulting in a massive scale of transmission lines. UHV and UHV lines limit the corona effect by selecting the cross-section and number of split conductors. In the design of overhead transmission lines, if the design margin is too small, it will result in higher corona losses, audible noise, and radio interference, leading to a deterioration of the electromagnetic environment; if the margin is too large, larger cross-sections and more split conductors are required, correspondingly increasing the mechanical strength of the towers, leading to economic waste.

[0003] The corona initiation field strength of conductors such as transmission lines and fittings is a major factor influencing line design, determining conductor selection, line structure, and construction costs. Therefore, effectively obtaining the corona initiation field strength of transmission line conductors is a critical technical issue that must be addressed in the design, construction, and operation of ultra-high voltage (UHV) transmission lines. The phenomenon of light emission during conductor corona discharge is an important corona effect. Molecules such as N2 and O2 in the surrounding air ionize and transition from the ground state to an excited state. During the transition from the excited state to the ground state or to lower-energy molecules, photons are released. Since the photons released during the excited state transition of N2 and O2 are mostly concentrated in the ultraviolet (invisible) and blue-violet visible light regions, the detection of ultraviolet light from conductors is often used as an important means of identifying conductor corona and monitoring equipment discharge. This method is also used in corona cage tests as an important tool for calculating and determining the corona initiation field strength of conductors.

[0004] However, existing methods for determining the corona initiation field strength based on ultraviolet spectroscopy have certain limitations. First, the photon count of an ultraviolet imager is easily affected by environmental interference. In particular, free photons in the air and natural light can affect the imager's readings, causing significant measurement errors. Second, corona discharge has a certain degree of randomness; the intensity of the discharge is not constant. Therefore, the number of photons acquired by the ultraviolet imager will also vary. While this is acceptable for monitoring and identifying equipment discharges, for calculating the corona initiation field strength of conductors, the continuously changing number of ultraviolet photons, due to its inherent error, necessitates manual estimation, leading to significant subjective factors and large deviations in the calculated corona initiation field strength. Summary of the Invention

[0005] The present invention provides a method and system for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge, so as to solve the problem of how to calculate the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge.

[0006] To address the aforementioned problems, this invention provides a method for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge, the method comprising:

[0007] Establish an experimental platform for determining the corona induction field strength of conductors based on ultraviolet spectra;

[0008] A voltage with a preset step size was applied to the conductor corona field strength discrimination test platform to obtain ultraviolet spectra at different voltage levels;

[0009] The single-frame image of the ultraviolet spectrum at each voltage level is processed to obtain the ratio of the area of ​​the ultraviolet region to the area of ​​the entire image at each voltage level.

[0010] Based on the ratio of the area of ​​the ultraviolet region corresponding to a single frame image to the area of ​​the entire image region, the ratio of the ultraviolet region of the multi-frame images to the multi-frame images of the entire image at each voltage level is calculated. Based on the multi-frame image ratio and the corresponding voltage level, the corona induction field strength of the conductor is determined.

[0011] Preferably, the test platform for determining the corona induction field strength of a conductor based on ultraviolet spectra includes: a corona cage, a conductor to be tested, a high-voltage power supply, and an ultraviolet imaging device.

[0012] Place the straightened test lead in the center of the corona cage;

[0013] The high-voltage power supply is introduced into the wire to be tested, and the ultraviolet imaging device is placed in a position directly facing the center of the wire to be tested to record the ultraviolet spectrum of the wire to be tested.

[0014] Preferably, the step of applying a voltage with a preset step size to the corona induction field strength discrimination test platform of the conductor and obtaining ultraviolet spectra at different voltage levels includes:

[0015] Calculate the surface electric field strength E0 of the conductor under test when a voltage of 1kV is applied;

[0016] The applied voltage to the conductor under test is increased in increments of 0.5 / E0, and the ultraviolet spectrum of the conductor under test at each voltage level is acquired by the ultraviolet imaging device, with no less than 500 frames of ultraviolet spectrum data at each voltage level.

[0017] Preferably, the step of processing a single frame image of the ultraviolet spectrum at each voltage level to obtain the ratio of the area of ​​the ultraviolet region corresponding to the single frame image at each voltage level to the area of ​​the entire image region includes:

[0018] The single-frame image of the ultraviolet spectrum at each voltage level is converted into a single-frame grayscale image, and the single-frame grayscale image is converted into a binary image. A binary matrix is ​​then obtained based on the binary image.

[0019]

[0020] Where f(x,y) is the value of the grayscale image (its value range is 0 to 1);

[0021] The binary matrix is ​​subjected to a filtering process of erosion followed by dilation to obtain the processed binary matrix. The erosion method is as follows:

[0022]

[0023] Among them, B xy Let B be the matrix centered at the point (x,y);

[0024] When the center point of matrix B is translated to the position (x,y) in matrix A, if matrix B is completely contained in matrix A, then (x,y) is obtained by satisfying the above erosion operation, which is the erosion result E(A) of the processed binary matrix.

[0025] The calculation method of the dilation algorithm is as follows:

[0026]

[0027] When the center point of matrix B is translated to the position (x,y) of matrix A, if matrix B intersects with matrix A, then (x,y) is obtained by satisfying the above expansion operation, which is the expansion result D(A) of the processed binary matrix.

[0028] Based on the processed binary matrix, the ratio of the total number of data 1s in the binary matrix to the number of elements is calculated, and the ratio is determined as the ratio k of the area of ​​the ultraviolet region of a single frame image to the area of ​​the entire image region.

[0029] Preferably, the ratio of the ultraviolet region area to the total image area for each voltage level is calculated based on the ratio of the ultraviolet region area corresponding to a single frame image to the total image area. Based on this multi-frame image ratio and the corresponding voltage level, the corona induction field strength of the conductor is determined, wherein:

[0030] The calculation of the ratio of the ultraviolet region area to the total image area in multiple frames at each voltage level includes:

[0031] Obtain the ratio k of each single frame of the spectrum. i Calculate the multi-frame spectrum ratio at each voltage level. Where N is the number of multi-frame maps, i is the map counting variable, 1≤i≤N

[0032] Establish the multi-frame spectral ratio k mean Based on the curve corresponding to the voltage level, the corona initiation voltage U of the conductor is determined using the tangent method. on ;

[0033] Based on the corona initiation voltage U on The corona induction field strength of the conductor is determined by the surface electric field strength E0:

[0034] E on =U on ×E0

[0035] According to another aspect of the present invention, the present invention provides a system for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge, the system comprising:

[0036] The initial unit is used to establish an experimental platform for determining the corona initiation field strength of conductors based on ultraviolet spectra;

[0037] The acquisition unit is used to apply a voltage with a preset step size to the conductor corona field strength discrimination test platform to acquire ultraviolet spectra at different voltage levels;

[0038] The processing unit is used to process a single frame image of the ultraviolet spectrum at each voltage level and obtain the ratio of the area of ​​the ultraviolet region to the area of ​​the entire image region corresponding to the single frame image at each voltage level.

[0039] The result unit is used to calculate the ratio of the ultraviolet region area to the total image area of ​​the multi-frame image at each voltage level based on the ratio of the ultraviolet region area corresponding to the total image area of ​​a single frame image, and to determine the corona induction field strength of the conductor based on the multi-frame image ratio and the corresponding voltage level.

[0040] Preferably, the initial unit is used to establish a test platform for determining the corona induction field strength of a conductor based on ultraviolet spectra, wherein the test platform for determining the corona induction field strength of a conductor includes: a corona cage, a conductor to be tested, a high-voltage power supply, and an ultraviolet imaging device;

[0041] Place the straightened test lead in the center of the corona cage;

[0042] The high-voltage power supply is introduced into the wire to be tested, and the ultraviolet imaging device is placed in a position directly facing the center of the wire to be tested to record the ultraviolet spectrum of the wire to be tested.

[0043] Preferably, the acquisition unit is used to apply a voltage of a preset step size to the conductor corona induction field strength discrimination test platform to acquire ultraviolet spectra at different voltage levels, including:

[0044] Calculate the surface electric field strength E0 of the conductor under test when a voltage of 1kV is applied;

[0045] The applied voltage to the conductor under test is increased in increments of 0.5 / E0, and the ultraviolet spectrum of the conductor under test at each voltage level is acquired by the ultraviolet imaging device, with no less than 500 frames of ultraviolet spectrum data at each voltage level.

[0046] Preferably, the processing unit is used to process a single-frame image of the ultraviolet spectrum at each voltage level to obtain the ratio of the area of ​​the ultraviolet region corresponding to the single-frame image at each voltage level to the area of ​​the entire image region, including:

[0047] The single-frame image of the ultraviolet spectrum at each voltage level is converted into a single-frame grayscale image, and the single-frame grayscale image is converted into a binary image. A binary matrix is ​​then obtained based on the binary image.

[0048]

[0049] Where f(x,y) is the value of the grayscale image (its value range is 0 to 1);

[0050] The binary matrix is ​​subjected to a filtering process of erosion followed by dilation to obtain the processed binary matrix. The erosion method is as follows:

[0051]

[0052] Among them, B xy Let B be the matrix centered at the point (x,y);

[0053] When the center point of matrix B is translated to the position (x,y) in matrix A, if matrix B is completely contained in matrix A, then (x,y) is obtained by satisfying the above erosion operation, which is the erosion result E(A) of the processed binary matrix.

[0054] The calculation method of the dilation algorithm is as follows:

[0055]

[0056] When the center point of matrix B is translated to the position (x,y) of matrix A, if matrix B intersects with matrix A, then (x,y) is obtained by satisfying the above expansion operation, which is the expansion result D(A) of the processed binary matrix.

[0057] Based on the processed binary matrix, the ratio of the total number of data 1s in the binary matrix to the number of elements is calculated, and the ratio is determined as the ratio k of the area of ​​the ultraviolet region of a single frame image to the area of ​​the entire image region.

[0058] Preferably, the result unit is used to calculate the ratio of the area of ​​the ultraviolet region to the area of ​​the entire image region in multiple frames of images at each voltage level, based on the ratio of the area of ​​the ultraviolet region corresponding to a single frame image to the area of ​​the entire image region. Based on the ratio of the multiple frame images and the corresponding voltage level, the corona induction field strength of the conductor is determined, wherein:

[0059] The calculation of the ratio of the ultraviolet region area to the total image area in multiple frames at each voltage level includes:

[0060] Obtain the ratio k of each single frame of the spectrum. i Calculate the multi-frame spectrum ratio at each voltage level. Where N is the number of multi-frame maps, i is the map counting variable, 1≤i≤N

[0061] Establish the multi-frame spectral ratio k mean Based on the curve corresponding to the voltage level, the corona initiation voltage U of the conductor is determined using the tangent method. on ;

[0062] Based on the corona initiation voltage U on The corona induction field strength of the conductor is determined by the surface electric field strength E0:

[0063] E on =U on ×E0

[0064] In another aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements steps such as those of a method for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge.

[0065] According to another aspect of the present invention, the present invention provides an electronic device, comprising:

[0066] The aforementioned computer-readable storage medium; and

[0067] One or more processors for executing a program in the computer-readable storage medium.

[0068] This invention provides a method and system for calculating the corona initiation field strength based on the ultraviolet (UV) spectrum of conductor corona discharge. The method includes: establishing a test platform for discriminating conductor corona initiation field strength based on UV spectra; applying a voltage with a preset step size to the test platform to obtain UV spectra at different voltage levels; processing single-frame images of the UV spectrum at each voltage level to obtain the ratio of the UV region area corresponding to each single-frame image to the total image area; calculating the ratio of the UV region area to the total image area across multiple frames at each voltage level based on the ratio of the UV region area to the total image area; and determining the conductor corona initiation field strength based on the ratio of the multiple frames and the corresponding voltage level. The calculation method and system provided by this invention, by using the multi-frame averaging of UV spectra, eliminates environmental interference and reduces errors caused by the randomness of corona discharge, providing a more objective method for calculating conductor corona initiation field strength. Attached Figure Description

[0069] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures:

[0070] Figure 1 This is a flowchart of a method for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge according to a preferred embodiment of the present invention.

[0071] Figure 2 This is a flowchart of a method for calculating the corona induction field strength of various types of conductors according to a preferred embodiment of the present invention;

[0072] Figure 3 This is a schematic diagram of the construction of a corona cage according to a preferred embodiment of the present invention;

[0073] Figure 4 This is a single-frame binary image according to a preferred embodiment of the present invention;

[0074] Figure 5 This is a smoothed single-frame binary image according to a preferred embodiment of the present invention;

[0075] Figure 6 A graph showing the average UV value of a conductor across multiple frames versus the corona initiation voltage according to a preferred embodiment of the present invention; and

[0076] Figure 7 This is a structural diagram of a system for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge according to a preferred embodiment of the present invention. Detailed Implementation

[0077] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0078] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0079] Figure 1 This is a flowchart of a method for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge according to a preferred embodiment of the present invention.

[0080] This invention proposes a method for processing ultraviolet (UV) spectra of conductor corona discharge and calculating the corona initiation field strength. This method eliminates the influence of free photon count and background light, employing a multi-frame averaging method to evaluate the corona photon count during the same corona discharge, replacing the single-frame result, and finally calculating the conductor corona initiation field strength. This solves the long-standing problem of significant subjective factors in determining conductor corona initiation field strength using existing UV images, providing technical support for the design of transmission line conductors.

[0081] This invention constructs a corona cage test platform for the corona initiation field strength of conductors using ultraviolet spectra. The maximum electric field strength on the conductor surface is calculated using the finite element method. The applied voltage is increased in a certain step size, and the ultraviolet spectrum of the conductor corona discharge is measured. For a single frame image, a filtering method is used to eliminate the influence of free photon number and background light. The corona photon number during the same corona discharge is evaluated by the multi-frame averaging method to replace the single frame result, and finally the corona initiation field strength of the conductor is calculated.

[0082] like Figure 1 As shown, this invention provides a method for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge. The method includes:

[0083] Step 101: Establish an experimental platform for determining the corona initiation field strength of conductors based on ultraviolet spectra;

[0084] Preferably, a test platform for determining the corona induction field strength of a conductor based on ultraviolet spectra is established, wherein the test platform for determining the corona induction field strength of a conductor includes: a corona cage, a conductor to be tested, a high-voltage power supply, and an ultraviolet imaging device;

[0085] Place the straightened test lead in the center of the corona cage;

[0086] A high-voltage power supply is introduced into the lead wire to be tested, and the ultraviolet imaging device is placed in the center of the lead wire to record the ultraviolet spectrum of the lead wire.

[0087] In step 101 of this invention, a test platform for determining the corona initiation field strength of a conductor based on ultraviolet (UV) spectra is constructed. A corona cage test platform is built, and the conductor is placed in the center of the cage and straightened using a guy wire tower. A high-voltage power supply is introduced to the conductor via a corrugated pipe, thus constructing the corona cage and the test platform for calculating the corona initiation field strength of the conductor. An UV imaging device is placed directly opposite the center of the conductor to record the UV spectrum during the voltage application process.

[0088] Preferably, the construction of the wire corona induction field strength discrimination test platform based on ultraviolet spectrum in step 101 includes:

[0089] Step 11: Build a test platform for the corona cage. Place the conductor whose corona field strength to be calculated in the center of the corona cage and straighten it through the insulator via a guyed pole to ensure that the conductor is insulated from the cage and the pole, and that the cage is reliably grounded.

[0090] Step 12: Introduce a high-voltage power supply. The high-voltage power supply is introduced into the conductor to be calculated through a corrugated pipe, thereby reducing the impact of corona discharge caused by the introduced conductor.

[0091] Step 13: Set up the ultraviolet imaging device. Place the ultraviolet imaging device directly opposite the center of the conductor, adjust the gain to make the measurement results resolvable, and adjust the ultraviolet imaging device to continuously acquire ultraviolet spectra.

[0092] Step 102: Apply a voltage with a preset step size to the conductor corona field strength discrimination test platform and obtain ultraviolet spectra at different voltage levels;

[0093] Preferably, a voltage with a preset step size is applied to the conductor corona induction field strength discrimination test platform to obtain ultraviolet spectra at different voltage levels, including:

[0094] Calculate the surface electric field strength E0 of the conductor under test when a voltage of 1kV is applied.

[0095] The applied voltage to the conductor under test is increased in increments of 0.5 / E0. Ultraviolet spectra of the conductor under test at each voltage level are acquired using an ultraviolet imaging device, with no less than 500 frames of ultraviolet spectra data at each voltage level.

[0096] In step 102 of this invention, ultraviolet (UV) spectra are measured under different applied voltage conditions. This invention uses the finite element method to model the corona cage and conductor, calculates the electric field strength E0 (unit: kV / cm) on the conductor surface when a voltage of 1 kV is applied, and increases the applied voltage in steps of 0.5 / E0 until the UV photon count fills the spectrum and the line corona noise is significant. UV spectra under different applied voltages are recorded to ensure continuous UV spectrum measurement, with at least 500 frames measured for each voltage.

[0097] The ultraviolet spectrum measurement under different applied voltage conditions in step 102 of this invention includes:

[0098] Step 21: Use the finite element method to establish a two-dimensional model of the corona cage and the conductor. The dimensions of the corona cage and the conductor should be consistent with the actual dimensions. The voltage applied to the surface of the conductor is 1kV, and the potential of the corona cage is zero. Calculate the maximum electric field strength E0 (unit: kV / cm) on the surface of the conductor.

[0099] Step 22: Based on the calculation results, apply voltage in increments of 0.5 / E0. Under the same applied voltage, continuously measure the ultraviolet spectrum of the conductor using an ultraviolet imaging device, ensuring that at least 500 frames of data are measured for each voltage, until ultraviolet photons fill the spectrum and the line corona noise becomes significant, then stop the measurement.

[0100] Step 103: Process the single-frame image of the ultraviolet spectrum at each voltage level to obtain the ratio of the area of ​​the ultraviolet region to the area of ​​the entire image region corresponding to the single-frame image at each voltage level.

[0101] Preferably, the single-frame image of the ultraviolet spectrum at each voltage level is processed to obtain the ratio of the area of ​​the ultraviolet region corresponding to the single-frame image at each voltage level to the area of ​​the entire image region, including:

[0102] The single-frame image of the ultraviolet spectrum at each voltage level is converted into a single-frame grayscale image, and the single-frame grayscale image is converted into a binary image. The binary matrix is ​​then obtained based on the binary image.

[0103]

[0104] Where f(x,y) is the value of the grayscale image (its value range is 0 to 1);

[0105] The binary matrix is ​​filtered by first erosion and then dilation to obtain the processed binary matrix. The erosion method is as follows:

[0106]

[0107] Among them, B xy Let B be the matrix centered at the point (x,y);

[0108] When the center point of matrix B is translated to the position (x,y) in matrix A, if matrix B is completely contained in matrix A, then (x,y) is obtained by the above erosion operation, which is the erosion result E(A) of the processed binary matrix.

[0109] The calculation method of the dilation algorithm is as follows:

[0110]

[0111] When the center point of matrix B is translated to the position (x,y) of matrix A, if matrix B intersects with matrix A, then (x,y) is obtained by satisfying the above expansion operation, which is the expansion result D(A) of the processed binary matrix.

[0112] Based on the processed binary matrix, the ratio of the total number of data 1s to the total number of elements in the binary matrix is ​​calculated, and this ratio is determined as the ratio k of the area of ​​the ultraviolet region of a single frame image to the area of ​​the entire image region.

[0113] In step 103 of this invention, single-frame ultraviolet spectrum processing is performed. For a single-frame image of the ultraviolet spectrum under each voltage condition, the image is preprocessed into a binary image, and a filtering method of erosion followed by dilation is used to eliminate tiny spikes and scattered points in the spectrum, thus smoothing the ultraviolet spectrum. Subsequently, the ultraviolet area of ​​the filtered image is calculated to obtain the ratio k of the ultraviolet region of the image to the whole image.

[0114] The single-frame ultraviolet spectrum processing in step 103 of this invention includes:

[0115] Step 31: Preprocess the image into a binary image. The ultraviolet single-frame image is an RGB image. Convert it into a grayscale image and then use the following formula to process the image into a binary image, thereby converting the image into a binary matrix.

[0116]

[0117] Step 32, filtering processing for the binary image. This involves removing spikes and scattered points from the image.

[0118] The UV spectrum was smoothed using a filtering method that first erodes and then dilates. The erosion method is as follows:

[0119]

[0120] The significance of the above method is that when the center point of matrix B is translated to the (x,y) position in matrix A, if matrix B is completely contained in matrix A, then (x,y) is obtained by satisfying the above erosion operation and belongs to the result E(A).

[0121] The dilation algorithm is the dual operation of the erosion algorithm, and its calculation method is as follows:

[0122]

[0123] The meaning is that when the center point of matrix B is translated to the (x,y) position of matrix A, if matrix B intersects with matrix A, then (x,y) is obtained by satisfying the above expansion operation and belongs to the result D(A).

[0124] Step 33: After filtering the above image, count the number of 1 values ​​in the filtered image and compare it with the number of elements in the entire matrix to obtain the ratio k of the ultraviolet region of the image to the whole image.

[0125] Step 104: Based on the ratio of the area of ​​the ultraviolet region corresponding to the single frame image to the area of ​​the entire image region, calculate the ratio of the ultraviolet region of the multi-frame image to the multi-frame image of the entire image at each voltage level. Based on the multi-frame image ratio and the corresponding voltage level, determine the corona induction field strength of the conductor.

[0126] Preferably, based on the ratio of the ultraviolet region area to the total image area in a single frame image, the ratio of the ultraviolet region area to the total image area in multiple frames at each voltage level is calculated. Based on the ratio of the multiple frames and the corresponding voltage level, the corona induction field strength of the conductor is determined, wherein:

[0127] The ratio of the area of ​​the ultraviolet region to the area of ​​the entire image region in multiple frames at each voltage level is calculated, including:

[0128] Obtain the ratio k of each single frame of the spectrum. i Calculate the multi-frame spectrum ratio at each voltage level. Where N is the number of multi-frame maps, i is the map counting variable, 1≤i≤N

[0129] Establish the multi-frame spectral ratio k mean Based on the curve corresponding to the voltage level, the corona initiation voltage U of the conductor is determined using the tangent method. on ;

[0130] Based on the corona induction voltage U on Determine the corona induction field strength of the conductor based on the surface electric field strength E0:

[0131] E on =U on ×E0

[0132] In step 104 of this invention, the average value of multiple frames of the ultraviolet spectrum and the corona induction field strength of the conductor are calculated. For each single frame of the ultraviolet spectrum with applied voltage U, the spectrum processing in step 103 is performed to obtain the ratio k of each spectrum. iCalculate and record the ratio of multiple frames of spectrum for each applied voltage continuous sampling. Plot k mean —U-curve, using the tangent method to obtain the corona initiation voltage U of the conductor. on (kV), the corona induction field strength E of the conductor is calculated based on the surface electric field strength E0 when 1kV is applied. on =U on / E0.

[0133] The calculation of the multi-frame mean of the ultraviolet spectrum and the corona induction field strength of the conductor in step 104 of this invention includes:

[0134] Step 41, averaging of multiple frames of ultraviolet spectra. For each single-frame ultraviolet spectrum image with applied voltage U, perform the spectral processing step 103 to obtain the ratio k of each single-frame spectrum. i Calculate and record the ratio of multiple frames of spectrum for each applied voltage continuous sampling.

[0135] Step 42, Calculation of halo field strength. Based on the calculation results of the average value of multiple ultraviolet frames with different applied voltages, plot k mean —U-curve, using the tangent method to obtain the corona initiation voltage U of the conductor. on (kV), the corona induction field strength E of the conductor is calculated based on the surface electric field strength E0 when 1kV is applied. on =U on ×E0.

[0136] The calculation of the multi-frame mean of the ultraviolet spectrum and the corona induction field strength of the conductor in step 104 of this invention includes:

[0137] Step 41, averaging of multiple frames of ultraviolet spectra. For each single-frame ultraviolet spectrum image with applied voltage U, perform the spectral processing step 103 to obtain the ratio k of each single-frame spectrum. i Calculate and record the ratio of multiple frames of spectrum for each applied voltage continuous sampling.

[0138] Step 42, Calculation of halo field strength. Based on the calculation results of the average value of multiple ultraviolet frames with different applied voltages, plot k mean —U-curve, using the tangent method to obtain the corona initiation voltage U of the conductor. on (kV), the corona induction field strength E of the conductor is calculated based on the surface electric field strength E0 when 1kV is applied. on =U on ×E0.

[0139] Figure 2 The preferred embodiment of the method for processing the ultraviolet spectrum of conductor corona discharge and calculating the corona initiation field intensity provided by this invention is as follows: Figure 3 As shown, the specific steps of the present invention are as follows:

[0140] I. Construction of an experimental platform for determining the corona induction field strength of conductors based on ultraviolet spectra.

[0141] Building such Figure 3 The corona cage test platform shown is constructed by erecting a 6×LGJ720 / 50 conductor in the center of the cage via a guyed pole. A high-voltage power supply is introduced to the conductor through a corrugated pipe, thus establishing the corona cage and the test platform for calculating the corona field strength. An ultraviolet imaging device is placed directly opposite the center of the conductor to record the ultraviolet spectrum during the voltage application process.

[0142] II. Ultraviolet Spectrum Measurements under Different Applied Voltage Conditions

[0143] A two-dimensional model of the corona cage and conductor was established using the finite element method. The dimensions of the corona cage and conductor should be consistent with the actual dimensions. A voltage of 1 kV was applied to the surface of the conductor, and the potential of the corona cage was zero. The maximum electric field strength on the surface of the conductor was calculated to be E0 = 0.037833 (unit: kV / cm).

[0144] Based on the calculation results, the applied voltage was increased in steps of 0.5 / E0 = 13.216 (kV). Under the same applied voltage, the ultraviolet spectrum of the conductor was continuously measured using an ultraviolet imaging device, ensuring that at least 500 frames of data were collected for each voltage, until the ultraviolet photon count filled the spectrum and the line corona noise became significant. At this point, the applied voltage was 449.3 kV.

[0145] III. Single-frame ultraviolet spectrum processing.

[0146] The image is preprocessed into a binary image. The ultraviolet single-frame image is an RGB image, which is converted into a grayscale image. Then, it is processed into a binary image according to equation (1), thereby converting the image into a binary matrix, such as... Figure 4 As shown;

[0147] After using a filtering method that involves erosion followed by expansion, the elimination Figure 3 By removing spikes and interference from a binary matrix, a filtered image can be obtained, such as... Figure 5 As shown;

[0148] according to Figure 5 The results show that Figure 5 The total area of ​​the matrix is ​​40996, of which the area of ​​values ​​of 1 is 22860. The area of ​​the ultraviolet spectrum is calculated to be k = 0.5576.

[0149] IV. Calculation of multi-frame mean of ultraviolet spectrum and corona induction field strength of conductor.

[0150] For each single-frame ultraviolet spectral image with applied voltage U, perform the spectral processing in step 103 to obtain the ratio k of each single-frame spectrum. iCalculate and record the ratio k of the multi-frame spectra of each applied voltage continuous sampling. mean Plot the curve showing the relationship between the mean and the applied voltage, such as... Figure 6 As shown, the corona initiation voltage of the conductor obtained by the tangent method is approximately 303.11 kV.

[0151] Based on the applied corona induction field strength E0 = 0.037833, the corona induction field strength E of the conductor is calculated. on =303.11*0.037833=11.47kV / cm.

[0152] Figure 7 This is a structural diagram of a system for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge according to a preferred embodiment of the present invention.

[0153] like Figure 7 As shown, this invention provides a system for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge. The system includes:

[0154] Initial unit 701 is used to establish a test platform for determining the corona induction field strength of conductors based on ultraviolet spectra;

[0155] Preferably, the initial unit 701 is used to establish a test platform for judging the corona initiation field strength of a conductor based on ultraviolet spectra, wherein the test platform for judging the corona initiation field strength of a conductor includes: a corona cage, a conductor to be tested, a high-voltage power supply and an ultraviolet imaging device;

[0156] Place the straightened test lead in the center of the corona cage;

[0157] A high-voltage power supply is introduced into the lead wire to be tested, and the ultraviolet imaging device is placed in the center of the lead wire to record the ultraviolet spectrum of the lead wire.

[0158] The acquisition unit 702 is used to apply a voltage with a preset step size to the conductor corona field strength discrimination test platform to acquire ultraviolet spectra at different voltage levels.

[0159] Preferably, the acquisition unit 702 is used to apply a voltage with a preset step size to the conductor corona induction field strength discrimination test platform to acquire ultraviolet spectra at different voltage levels, including:

[0160] Calculate the surface electric field strength E0 of the conductor under test when a voltage of 1kV is applied.

[0161] The applied voltage to the conductor under test is increased in increments of 0.5 / E0. Ultraviolet spectra of the conductor under test at each voltage level are acquired using an ultraviolet imaging device, with no less than 500 frames of ultraviolet spectra data at each voltage level.

[0162] The processing unit 703 is used to process a single frame image of the ultraviolet spectrum at each voltage level and obtain the ratio of the area of ​​the ultraviolet region to the area of ​​the entire image region corresponding to the single frame image at each voltage level.

[0163] Preferably, the processing unit 703 is used to process a single-frame image of the ultraviolet spectrum at each voltage level to obtain the ratio of the area of ​​the ultraviolet region corresponding to the single-frame image at each voltage level to the area of ​​the entire image region, including:

[0164] The single-frame image of the ultraviolet spectrum at each voltage level is converted into a single-frame grayscale image, and the single-frame grayscale image is converted into a binary image. The binary matrix is ​​then obtained based on the binary image.

[0165]

[0166] Where f(x,y) is the value of the grayscale image (its value range is 0 to 1);

[0167] The binary matrix is ​​filtered by first erosion and then dilation to obtain the processed binary matrix. The erosion method is as follows:

[0168]

[0169] Among them, B xy Let B be the matrix centered at the point (x,y);

[0170] When the center point of matrix B is translated to the position (x,y) in matrix A, if matrix B is completely contained in matrix A, then (x,y) is obtained by the above erosion operation, which is the erosion result E(A) of the processed binary matrix.

[0171] The calculation method of the dilation algorithm is as follows:

[0172]

[0173] When the center point of matrix B is translated to the position (x,y) of matrix A, if matrix B intersects with matrix A, then (x,y) is obtained by satisfying the above expansion operation, which is the expansion result D(A) of the processed binary matrix.

[0174] Based on the processed binary matrix, the ratio of the total number of data 1s to the total number of elements in the binary matrix is ​​calculated, and this ratio is determined as the ratio k of the area of ​​the ultraviolet region of a single frame image to the area of ​​the entire image region.

[0175] The result unit 704 is used to calculate the ratio of the ultraviolet region area to the total image area of ​​the multi-frame image at each voltage level based on the ratio of the ultraviolet region area corresponding to the single-frame image to the total image area, and to determine the corona induction field strength of the conductor based on the multi-frame image ratio and the corresponding voltage level.

[0176] Preferably, the result unit 704 is used to calculate the ratio of the area of ​​the ultraviolet region to the area of ​​the entire image region in multiple frames of images at each voltage level, based on the ratio of the area of ​​the ultraviolet region corresponding to a single frame image to the area of ​​the entire image region. Based on the ratio of the multiple frame images and the corresponding voltage level, the corona induction field strength of the conductor is determined, wherein:

[0177] The ratio of the area of ​​the ultraviolet region to the area of ​​the entire image region in multiple frames at each voltage level is calculated, including:

[0178] Obtain the ratio k of each single frame of the spectrum. i Calculate the multi-frame spectrum ratio at each voltage level. Where N is the number of multi-frame maps, i is the map counting variable, 1≤i≤N

[0179] Establish the multi-frame spectral ratio k mean Based on the curve corresponding to the voltage level, the corona initiation voltage U of the conductor is determined using the tangent method. on ;

[0180] Based on the corona induction voltage U on Determine the corona induction field strength of the conductor based on the surface electric field strength E0:

[0181] E on =U on ×E0

[0182] The preferred embodiment of the present invention provides a system for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge, which corresponds to another preferred embodiment of the present invention and a method for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge. These will not be described in detail here.

[0183] The present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements steps such as those of a method for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge.

[0184] This invention provides an electronic device, comprising:

[0185] The aforementioned computer-readable storage medium; and

[0186] One or more processors for executing a program in a computer-readable storage medium.

[0187] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0188] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0189] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0190] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0191] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0192] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0193] The invention has been described with reference to a few embodiments. However, as will be known to those skilled in the art, and as defined in the appended claims, other embodiments besides those disclosed above fall equivalently within the scope of the invention.

[0194] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

Claims

1. A method for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge, characterized in that, The method includes: Establish an experimental platform for determining the corona induction field strength of conductors based on ultraviolet spectra; A voltage with a preset step size was applied to the conductor corona field strength discrimination test platform to obtain ultraviolet spectra at different voltage levels; The single-frame image of the ultraviolet spectrum at each voltage level is processed to obtain the ratio of the area of ​​the ultraviolet region to the area of ​​the entire image at each voltage level. Based on the ratio of the area of ​​the ultraviolet region corresponding to a single frame image to the area of ​​the entire image region, the ratio of the ultraviolet region of the multi-frame images to the multi-frame images of the entire image at each voltage level is calculated. Based on the multi-frame image ratio and the corresponding voltage level, the corona induction field strength of the conductor is determined.

2. The method according to claim 1, characterized in that, The establishment of a wire corona induction field strength discrimination test platform based on ultraviolet spectrum includes: a corona cage, a wire to be tested, a high voltage power supply and an ultraviolet imaging device; Place the straightened test lead in the center of the corona cage; The high-voltage power supply is introduced into the wire to be tested, and the ultraviolet imaging device is placed in a position directly facing the center of the wire to be tested to record the ultraviolet spectrum of the wire to be tested.

3. The method according to claim 2, characterized in that, The step of applying a voltage with a preset step size to the corona induction field strength discrimination test platform of the conductor and obtaining ultraviolet spectra at different voltage levels includes: Calculate the surface electric field strength E0 of the conductor under test when a voltage of 1kV is applied; The applied voltage to the conductor under test is increased in increments of 0.5 / E0, and the ultraviolet spectrum of the conductor under test at each voltage level is acquired by the ultraviolet imaging device, with no less than 500 frames of ultraviolet spectrum data at each voltage level.

4. The method according to claim 1, characterized in that, The process of processing single-frame images of the ultraviolet spectrum at each voltage level to obtain the ratio of the area of ​​the ultraviolet region corresponding to the single-frame image at each voltage level to the area of ​​the entire image region includes: The single-frame image of the ultraviolet spectrum at each voltage level is converted into a single-frame grayscale image, and the single-frame grayscale image is converted into a binary image. A binary matrix is ​​then obtained based on the binary image. Where f(x,y) is the value of the grayscale image (its value range is 0 to 1); The binary matrix is ​​subjected to a filtering process of erosion followed by dilation to obtain the processed binary matrix. The erosion method is as follows: Among them, B xy Let B be the matrix centered at the point (x,y); When the center point of matrix B is translated to the position (x,y) in matrix A, if matrix B is completely contained in matrix A, then (x,y) is obtained by satisfying the above erosion operation, which is the erosion result E(A) of the processed binary matrix. The calculation method of the dilation algorithm is as follows: When the center point of matrix B is translated to the position (x,y) of matrix A, if matrix B intersects with matrix A, then (x,y) is obtained by satisfying the above expansion operation, which is the expansion result D(A) of the processed binary matrix. Based on the processed binary matrix, the ratio of the total number of data 1s in the binary matrix to the number of elements is calculated, and the ratio is determined as the ratio k of the area of ​​the ultraviolet region of a single frame image to the area of ​​the entire image region.

5. The method according to claim 3, characterized in that, The ratio of the ultraviolet region area to the total image area in a single frame image is used to calculate the multi-frame image ratio for each voltage level. Based on this multi-frame image ratio and the corresponding voltage level, the corona induction field strength of the conductor is determined, wherein: The calculation of the ratio of the ultraviolet region area to the total image area in multiple frames at each voltage level includes: Obtain the ratio k of each single frame of the spectrum. i Calculate the multi-frame spectrum ratio at each voltage level. Where N is the number of multi-frame maps, i is the map counting variable, 1≤i≤N Establish the multi-frame spectral ratio k mean Based on the curve corresponding to the voltage level, the corona initiation voltage U of the conductor is determined using the tangent method. on ; Based on the corona initiation voltage U on The corona induction field strength of the conductor is determined by the surface electric field strength E0: And on =U on ×E0.

6. A system for calculating the corona initiation field strength based on the ultraviolet spectrum of conductor corona discharge, characterized in that, The system includes: The initial unit is used to establish an experimental platform for determining the corona initiation field strength of conductors based on ultraviolet spectra; The acquisition unit is used to apply a voltage with a preset step size to the conductor corona field strength discrimination test platform to acquire ultraviolet spectra at different voltage levels; The processing unit is used to process a single frame image of the ultraviolet spectrum at each voltage level and obtain the ratio of the area of ​​the ultraviolet region to the area of ​​the entire image region corresponding to the single frame image at each voltage level. The result unit is used to calculate the ratio of the ultraviolet region area to the total image area of ​​the multi-frame image at each voltage level based on the ratio of the ultraviolet region area corresponding to the total image area of ​​a single frame image, and to determine the corona induction field strength of the conductor based on the multi-frame image ratio and the corresponding voltage level.

7. The system according to claim 6, characterized in that, The initial unit is used to establish a test platform for determining the corona induction field strength of conductors based on ultraviolet spectra. The test platform for determining the corona induction field strength of conductors includes: a corona cage, a conductor to be tested, a high-voltage power supply, and an ultraviolet imaging device. Place the straightened test lead in the center of the corona cage; The high-voltage power supply is introduced into the wire to be tested, and the ultraviolet imaging device is placed in a position directly facing the center of the wire to be tested to record the ultraviolet spectrum of the wire to be tested.

8. The system according to claim 7, characterized in that, The acquisition unit is used to apply a voltage of a preset step size to the conductor corona induction field strength discrimination test platform to acquire ultraviolet spectra at different voltage levels, including: Calculate the surface electric field strength E0 of the conductor under test when a voltage of 1kV is applied; The applied voltage to the conductor under test is increased in increments of 0.5 / E0, and the ultraviolet spectrum of the conductor under test at each voltage level is acquired by the ultraviolet imaging device, with no less than 500 frames of ultraviolet spectrum data at each voltage level.

9. The system according to claim 6, characterized in that, The processing unit is used to process a single frame image of the ultraviolet spectrum at each voltage level, and obtain the ratio of the area of ​​the ultraviolet region corresponding to the single frame image at each voltage level to the area of ​​the entire image region, including: The single-frame image of the ultraviolet spectrum at each voltage level is converted into a single-frame grayscale image, and the single-frame grayscale image is converted into a binary image. A binary matrix is ​​then obtained based on the binary image. Where f(x,y) is the value of the grayscale image; The binary matrix is ​​subjected to a filtering process of erosion followed by dilation to obtain the processed binary matrix. The erosion method is as follows: Among them, B xy Let B be the matrix centered at the point (x,y); When the center point of matrix B is translated to the position (x,y) in matrix A, if matrix B is completely contained in matrix A, then (x,y) is obtained by satisfying the above erosion operation, which is the erosion result E(A) of the processed binary matrix. The calculation method of the dilation algorithm is as follows: When the center point of matrix B is translated to the position (x,y) of matrix A, if matrix B intersects with matrix A, then (x,y) is obtained by satisfying the above expansion operation, which is the expansion result D(A) of the processed binary matrix. Based on the processed binary matrix, the ratio of the total number of data 1s in the binary matrix to the number of elements is calculated, and the ratio is determined as the ratio k of the area of ​​the ultraviolet region of a single frame image to the area of ​​the entire image region.

10. The system according to claim 8, characterized in that, The result unit is used to calculate the ratio of the ultraviolet region area to the total image area for each voltage level based on the ratio of the ultraviolet region area to the total image area for a single frame image. Based on this ratio and the corresponding voltage level, the corona induction field strength of the conductor is determined, wherein: The calculation of the ratio of the ultraviolet region area to the total image area in multiple frames at each voltage level includes: Obtain the ratio k of each single frame of the spectrum. i Calculate the multi-frame spectrum ratio at each voltage level. Where N is the number of multi-frame maps, i is the map counting variable, 1≤i≤N Establish the multi-frame spectral ratio k mean Based on the curve corresponding to the voltage level, the corona initiation voltage U of the conductor is determined using the tangent method. on ; Based on the corona initiation voltage U on The corona induction field strength of the conductor is determined by the surface electric field strength E0: And on =U on ×E0.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in any one of claims 1-5.

12. An electronic device, characterized in that, include: The computer-readable storage medium as described in claim 11; as well as One or more processors for executing a program in the computer-readable storage medium.

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