A method and device for identifying the aging state of a cable

Abstract

An embodiment of the present application discloses a method and device for identifying the aging state of a cable. Monitor the carbon black particles on the shielding layer of the cable to be measured to obtain a carbon black particle distribution image corresponding to the cable to be measured; mark the agglomeration points on the carbon black particle distribution image and measure the distance between different carbon black particles in the agglomeration points to obtain carbon black particle distribution data corresponding to the cable to be measured; wherein, the carbon black particle distribution data at least includes the number of marked agglomeration points and the image distance between two adjacent carbon black particles in each agglomeration point; mark the functional groups corresponding to the cable to be measured according to a pre-configured fluorescent probe solution, perform functional group detection on the marked cable to be measured to obtain fluorescent distribution data corresponding to the cable to be measured; based on the carbon black particle distribution data and the fluorescent distribution data, determine the aging state of the cable to be measured. Through the above method, the accuracy of cable aging state identification is improved.

Description

Technical Field

[0001] This application relates to the technical field of cable detection, and particularly to a method and device for identifying the aging state of cables. Background Art

[0002] The shielding layer of high-voltage cables is a composite material composed of carbon black, cross-linking agents, etc., and contains many types of functional groups. During the actual operation of the cable, the shielding layer not only plays a role in evenly distributing the electric field, but also serves as a bridge between the insulating layer and the conductor. Therefore, it is particularly important to evaluate the aging state of the shielding layer.

[0003] Currently, the methods for evaluating the performance of the shielding layer of high-voltage cables are mainly based on infrared spectroscopy and macroscopic force, electricity, and optical research. For example, methods such as withstand voltage tests, thermogravimetric analysis, and oxygen consumption experiments. However, these methods are not sensitive to the results of short-term aging tests of cables and are mostly applicable to the detection when the material is severely aged.

[0004] In order to identify the initial aging state of cables, Fourier Transform Infrared Spectroscopy (FTIR) has been widely used. FTIR is considered the most commonly used method for detecting changes in functional groups such as hydroxyl, carbonyl, and ketone groups during the aging process of polymers. However, the sensitivity of its technology is difficult to accurately measure the functional groups generated by cable aging, making it difficult to accurately identify the aging state of cables. Summary of the Invention

[0005] Embodiments of this application provide a method and device for identifying the aging state of cables to solve the following technical problems: Existing technologies are difficult to accurately measure the functional groups generated by cable aging, making it difficult to accurately identify the aging state of cables.

[0006] Embodiments of this application adopt the following technical solutions:

[0007] Embodiments of this application provide a method for identifying the aging state of cables. The method includes: monitoring carbon black particles in the shielding layer of the cable to be measured to obtain a carbon black particle distribution image corresponding to the cable to be measured; marking the agglomeration points in the carbon black particle distribution image and measuring the distance between different carbon black particles in the agglomeration points to obtain carbon black particle distribution data corresponding to the cable to be measured; where the carbon black particle distribution data includes at least the number of marked agglomeration points and the image distance between adjacent two carbon black particles in each agglomeration point; marking the functional groups corresponding to the cable to be measured with a pre-configured fluorescent probe solution, detecting the functional groups of the marked cable to be measured to obtain fluorescent distribution data corresponding to the cable to be measured; and determining the aging state of the cable to be measured based on the carbon black particle distribution data and the fluorescent distribution data.

[0008] In the embodiments of the present application, by labeling and measuring the carbon black particle distribution image corresponding to the cable to be tested, the carbon black particle distribution data corresponding to the cable to be tested is obtained, so as to determine different aging degrees of the cable according to different carbon black particle distribution data. Secondly, the embodiments of the present application also determine the fluorescent probe solution according to the types of functional groups of the cable to be tested, and then use different fluorescent probe solutions to label the cable to be tested, so as to clarify the quantity and distribution of the functional groups in the cable to be tested. Therefore, the embodiments of the present application analyze the aging degree of the cable to be tested from two aspects of carbon black particles and fluorescence distribution, thereby improving the accuracy of judging the aging degree of the cable to be tested.

[0009] In one implementation manner of the present application, before detecting the carbon black particles on the shielding layer of the cable to be tested and obtaining the carbon black particle distribution image corresponding to the cable to be tested, the method further includes: performing accelerated thermal aging treatment on the cable to be tested to obtain a first cable specimen to be tested; based on the first cable specimen to be tested, obtaining a first test slide; wherein, the first cable specimen to be tested is pasted on the first test slide; detecting the carbon black particles on the shielding layer of the cable to be tested to obtain the carbon black particle distribution image corresponding to the cable to be tested, specifically including: monitoring the first test slide through a desktop scanning electron microscope, and uploading the monitored image to a computer, and identifying the carbon black particles in the image through the computer to obtain the carbon black particle distribution image corresponding to the cable to be tested.

[0010] In one implementation manner of the present application, marking the agglomeration points on the carbon black particle distribution image specifically includes: obtaining a plurality of carbon black particle reference agglomeration points in the carbon black particle distribution image; wherein, the distance between any two adjacent carbon black particles in the carbon black particle reference agglomeration points is less than a preset distance; obtaining the position information of the edge carbon black particles corresponding to the plurality of carbon black particle reference agglomeration points respectively, so as to calculate the agglomeration area corresponding to the plurality of carbon black particle reference agglomeration points respectively based on the position information of the edge carbon black particles; wherein, the edge carbon black particles are the four carbon black particles at the uppermost, lowermost, leftmost and rightmost positions corresponding to each carbon black particle reference agglomeration point respectively; marking the carbon black particle reference agglomeration points with an agglomeration area greater than the preset agglomeration area.

[0011] In one implementation manner of the present application, calculating the agglomeration area corresponding to the plurality of carbon black particle reference agglomeration points respectively based on the position information of the edge carbon black particles specifically includes: determining a first horizontal line based on the uppermost carbon black particle, and determining a second horizontal line based on the lowermost carbon black particle; and determining a first vertical line based on the leftmost carbon black particle, and determining a second vertical line based on the rightmost carbon black particle; determining the circumscribed rectangle corresponding to the carbon black particle reference agglomeration point according to the first horizontal line, the second horizontal line, the first vertical line and the second vertical line; determining the area of the inscribed circle corresponding to the circumscribed rectangle, and taking the area of the inscribed circle as the agglomeration area of the carbon black particle reference agglomeration point.

[0012] In the embodiment of the present application, by determining the position information of the edge carbon black particles of the current carbon black particle reference agglomeration point, the corresponding circumscribed rectangle area can be determined according to the corresponding position information. Since the corresponding circumscribed rectangle area is larger than the actual area of the current carbon black particle reference agglomeration point, therefore, the area of the inscribed circle corresponding to the circumscribed rectangle is used as the agglomeration area of the carbon black particle reference agglomeration point, thereby improving the accuracy of the obtained agglomeration area.

[0013] In one implementation manner of the present application, the functional groups corresponding to the cable to be measured are labeled according to a pre-configured fluorescent probe solution, and the functional groups of the labeled cable to be measured are detected to obtain the fluorescence distribution data corresponding to the cable to be measured, which specifically includes: performing an infrared spectrum test on the shielding layer of the cable to be measured to obtain the types of functional groups corresponding to the cable to be measured; determining the corresponding fluorescent probe solution according to the types of functional groups; performing functional group labeling on the cable to be measured based on the fluorescent probe solution; obtaining the fluorescence distribution data corresponding to the labeled cable to be measured through a confocal laser scanning microscope; wherein, the fluorescence distribution data at least includes the fluorescence emission wavelength and the number of fluorescent functional groups.

[0014] In one implementation manner of the present application, before obtaining the fluorescence distribution data corresponding to the labeled cable to be measured through a confocal laser scanning microscope, the method further includes: performing an accelerated thermal aging treatment on the cable to be measured to obtain a second cable specimen to be measured; respectively performing a drying treatment on the second cable specimen to be measured with fluorescent probe labeling and the second specimen to be measured without fluorescent probe labeling; obtaining a second test slide based on the second cable specimen to be measured with fluorescent probe labeling; and obtaining a third test slide based on the second specimen to be measured without fluorescent probe labeling, so as to obtain the distribution of two-dimensional fluorescence through the second test slide and the third test slide; wherein, the second cable specimen to be measured with fluorescent probe labeling is pasted on the second test slide, and the second cable specimen to be measured without fluorescent probe labeling is pasted on the third test slide.

[0015] In one implementation manner of the present application, to obtain the fluorescence distribution corresponding to the labeled cable to be measured through a confocal laser scanning microscope, it specifically includes: performing two-dimensional imaging on the second test slide through a confocal laser scanning microscope to obtain a first image corresponding to the cable to be measured; and performing two-dimensional imaging on the third test slide to obtain a second image corresponding to the cable to be measured; comparing the first image with the second image to obtain the fluorescence distribution data corresponding to the labeled cable to be measured.

[0016] In the embodiments of the present application, by comparing the fluorescence distribution image corresponding to the cable under test after marking with the image of the cable under test without marking, the accurate position of the fluorescence distribution can be determined by comparison. Thus, the obtained fluorescence distribution data can be further determined.

[0017] In one implementation manner of the present application, based on the carbon black particle distribution data and the fluorescence distribution data, the aging state of the cable under test is determined, specifically including: comparing the fluorescence emission wavelength with a preset wavelength threshold; and comparing the distance between two adjacent carbon black particles in the agglomeration point with a preset distance threshold; if the fluorescence emission wavelength is greater than the preset wavelength threshold, and the distance between two adjacent carbon black particles in the agglomeration point is greater than the preset distance threshold, it is determined that the cable under test is in a severely aged state; otherwise, based on the number of marked agglomeration points and the number of fluorescent functional groups, the aging state of the cable under test is re-determined.

[0018] In one implementation manner of the present application, based on the number of agglomeration points and the number of functional groups, the aging state of the cable under test is re-determined, specifically including: when the fluorescence emission wavelength is less than the preset wavelength threshold, and / or the distance between two adjacent carbon black particles in the agglomeration point is less than the preset distance threshold; and the number of agglomeration points is greater than a first preset number threshold, and / or the number of fluorescent functional groups is greater than a second preset number threshold, it is determined that the cable under test is in a moderately aged state; when the fluorescence emission wavelength is less than the preset wavelength threshold, and the distance between two adjacent carbon black particles in the agglomeration point is less than the preset distance threshold; and the number of agglomeration points is less than the first preset number threshold, and the number of fluorescent functional groups is less than the second preset number threshold, it is determined that the cable under test is in a slightly aged state.

[0019] The embodiments of the present application provide a device for identifying the aging state of a cable, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor is enabled to: monitor carbon black particles on the shielding layer of the cable under test to obtain a carbon black particle distribution image corresponding to the cable under test; perform agglomeration point marking on the carbon black particle distribution image, and measure the distance between different carbon black particles in the agglomeration point to obtain carbon black particle distribution data corresponding to the cable under test; wherein, the carbon black particle distribution data at least includes the number of marked agglomeration points and the image distance between two adjacent carbon black particles in each agglomeration point; mark the functional groups corresponding to the cable under test according to a pre-configured fluorescent probe solution, perform functional group detection on the marked cable under test to obtain fluorescence distribution data corresponding to the cable under test; and determine the aging state of the cable under test based on the carbon black particle distribution data and the fluorescence distribution data.

[0020] The above at least one technical solution adopted in the embodiments of the present application can achieve the following beneficial effects: In the embodiments of the present application, by annotating and measuring the carbon black particle distribution image corresponding to the cable to be tested, the carbon black particle distribution data corresponding to the cable to be tested is obtained, so as to determine different aging degrees of the cable according to different carbon black particle distribution data. Secondly, in the embodiments of the present application, a fluorescence probe solution is also determined according to the types of functional groups of the cable to be tested, and then different fluorescence probe solutions are used to mark the cable to be tested, so as to clarify the quantity and distribution of functional groups in the cable to be tested. Therefore, in the embodiments of the present application, the aging degree of the cable to be tested is analyzed from two aspects of carbon black particles and fluorescence distribution, thereby improving the accuracy of judging the aging degree of the cable to be tested. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings. In the appended

[0022] In the figure:

[0023] Figure 1 is a flowchart of a method for identifying the aging state of a cable provided by an embodiment of the present application;

[0024] Figure 2 is a schematic structural diagram of a device for identifying the aging state of a cable provided by an embodiment of the present application. Detailed Embodiments

[0025] The embodiments of the present application provide a method and a device for identifying the aging state of a cable.

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0027] Currently, the methods for evaluating the performance of the shielding layer of high-voltage cables are mainly based on infrared spectroscopy and macroscopic force, electricity, and optical research. For example, methods such as withstand voltage tests, thermogravimetric analysis, and oxygen consumption experiments. However, these methods are not sensitive to the results of short-term aging tests of cables and are mostly applicable to the detection when the material aging is severe.

[0028] In order to identify the initial aging state of cables, Fourier Transform Infrared Spectroscopy (FTIR) has been widely used. FTIR is considered the most common method for detecting changes in functional groups such as hydroxyl, carbonyl, and ketone groups during the aging process of polymers. However, the sensitivity of its technology makes it difficult to accurately measure the functional groups generated by cable aging, resulting in difficulty in accurately identifying the aging state of cables.

[0029] To solve the above problems, the embodiments of the present application provide a method and device for identifying the aging state of cables. By annotating and measuring the carbon black particle distribution image corresponding to the cable to be tested, the carbon black particle distribution data corresponding to the cable to be tested is obtained, and thus different aging degrees of the cable are determined according to different carbon black particle distribution data. Secondly, the embodiments of the present application also determine the fluorescent probe solution according to the types of functional groups of the cable to be tested, and then use different fluorescent probe solutions to mark the cable to be tested to clarify the quantity and distribution of functional groups in the cable to be tested. Therefore, the embodiments of the present application analyze the aging degree of the cable to be tested from two aspects of carbon black particles and fluorescence distribution, thereby improving the accuracy of judging the aging degree of the cable to be tested.

[0030] The technical solutions proposed in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0031] Figure 1 It is a flowchart of a method for identifying the aging state of cables provided by the embodiments of the present application. As Figure 1 shown, the method for identifying the aging state of cables includes the following steps:

[0032] S101. The device for identifying the aging state of cables monitors the carbon black particles on the shielding layer of the cable to be tested to obtain the carbon black particle distribution image corresponding to the cable to be tested.

[0033] In an embodiment of the present application, the cable to be tested is subjected to accelerated thermal aging treatment to obtain a first cable specimen to be tested. Based on the first cable specimen to be tested, a first test slide is obtained; wherein, the first cable specimen to be tested is pasted on the first test slide. Detecting the carbon black particles on the shielding layer of the cable to be tested to obtain the carbon black particle distribution image corresponding to the cable to be tested specifically includes: monitoring the first test slide through a desktop scanning electron microscope, and uploading the monitored image to a computer, and identifying the carbon black particles in the image through the computer to obtain the carbon black particle distribution image corresponding to the cable to be tested.

[0034] Specifically, the cable to be measured in this application can be a cable used in an actual power supply scenario or a cable after an aging experiment in the laboratory. If it is a cable used in an actual power supply scenario, it can be directly intercepted, and the intercepted cable specimen can be pasted onto a glass slide to produce a first glass slide to be measured. If the cable to be measured is a cable after an aging experiment in the laboratory, the cable to be measured can be processed by accelerated thermal aging treatment, the cable after thermal aging treatment can be intercepted, and the intercepted cable can be pasted on a glass slide to obtain a first glass slide to be measured.

[0035] It should be noted that when conducting a thermal aging experiment on the cable, the aging state corresponding to the cable to be measured may be known in advance, but this does not affect the execution of the process of identifying the aging state of the cable to be measured. Moreover, the aging state determined by the thermal aging experiment can even be used to evaluate the accuracy of the aging state identified by the aging state identification method provided in the embodiments of this application.

[0036] Further, after obtaining the first glass slide to be measured, a desktop scanning electron microscope is used to monitor the first glass slide to be measured, and the monitored image is uploaded to a computer to obtain a carbon black particle distribution image corresponding to the cable to be measured.

[0037] S102. The cable aging state identification device marks the agglomeration points on the carbon black particle distribution image and measures the distance between different carbon black particles in the agglomeration points to obtain carbon black particle distribution data corresponding to the cable to be measured.

[0038] In an embodiment of this application, a plurality of carbon black particle reference agglomeration points in the carbon black particle distribution image are obtained, where the distance between any two adjacent carbon black particles in the carbon black particle reference agglomeration points is less than a preset distance. The position information of the edge carbon black particles corresponding to the plurality of carbon black particle reference agglomeration points is obtained to calculate the agglomeration area corresponding to each of the plurality of carbon black particle reference agglomeration points based on the position information of the edge carbon black particles. Here, the edge carbon black particles are the four carbon black particles at the top, bottom, left, and right of each carbon black particle reference agglomeration. The carbon black particle reference agglomeration points with an agglomeration area greater than the preset agglomeration area are marked.

[0039] The volume resistivity of the cable shielding layer decreases after thermal aging. Before aging, the carbon black particles are evenly distributed and the conductive network is relatively uniform. After high-temperature aging, the matrix in the shielding layer expands, the distribution of carbon black particles shows an agglomeration phenomenon, resulting in a decrease in the distance between some particles, an increase in the probability of electron tunneling, and a decrease in the volume resistivity.

[0040] Further, based on the obtained carbon black particle distribution image, a reference agglomeration point of carbon black particles where the carbon black particles are relatively dense is determined in the image. Specifically, in the embodiments of the present application, a distance between two adjacent carbon black particles is preset in advance. If the distance between two adjacent carbon black particles is less than the preset distance in a place where the carbon black particles are dense, it indicates that an agglomeration phenomenon occurs in the carbon black particle distribution. At this time, the place where the carbon black particles are dense is used as the reference agglomeration point of carbon black particles.

[0041] Further, position information of the edge carbon black particles corresponding to each determined reference agglomeration point of carbon black particles is obtained. In the embodiments of the present application, the four points at the uppermost, lowermost, leftmost, and rightmost of each reference agglomeration point of carbon black particles are used as the edge carbon black particles. The area of each reference agglomeration point of carbon black particles can be obtained through the coordinates of the edge carbon black particles. The area of each obtained reference agglomeration point of carbon black particles is compared with a preset agglomeration area. If the area of the reference agglomeration point of carbon black particles is greater than the preset agglomeration area, the reference agglomeration point of carbon black particles is marked. Among them, the carbon black particle distribution data includes at least the number of marked agglomeration points and the distance between two adjacent carbon black particles in each agglomeration point.

[0042] It should be noted that the preset agglomeration area in the embodiments of the present application can be set by researchers according to the characteristics of the current cable to be measured, and the embodiments of the present application do not limit this.

[0043] In an embodiment of the present application, a first horizontal line is determined based on the uppermost carbon black particle, and a second horizontal line is determined based on the lowermost carbon black particle. And a first vertical line is determined based on the leftmost carbon black particle, and a second vertical line is determined based on the rightmost carbon black particle. Based on the first horizontal line, the second horizontal line, the first vertical line, and the second vertical line, a circumscribed rectangle corresponding to the reference agglomeration point of carbon black particles is determined. The area of the inscribed circle corresponding to the circumscribed rectangle is determined, and the area of the inscribed circle is used as the agglomeration area of the reference agglomeration point of carbon black particles.

[0044] Specifically, in order to determine the area of each reference agglomeration point of carbon black particles, a coordinate system needs to be established for the carbon black particle distribution image in advance. For example, the intersection point of the straight line where the left edge of the carbon black particle distribution image is located and the straight line where the lower edge is located can be used as the origin, the straight line where the left edge is located is used as the x-axis, and the straight line where the lower edge is located is used as the y-axis to establish a coordinate system. A first horizontal line is drawn through the uppermost carbon black particle, a second horizontal line is drawn through the lowermost carbon black particle, and a first vertical line is drawn through the leftmost carbon black particle, and a second vertical line is drawn through the rightmost carbon black particle. The first horizontal line, the second horizontal line, the first vertical line, and the second vertical line are extended and intersected to obtain the corresponding rectangular frame.

[0045] Further, since the area of the determined circumscribed rectangle is greater than the area of the reference agglomeration point of the carbon black particles. Therefore, in order to improve the accuracy of the obtained agglomeration area, an inscribed circle of the rectangular frame is determined, and the area of the inscribed circle is used as the agglomeration area of the current reference agglomeration point of the carbon black particles.

[0046] S103. The cable aging state identification device marks the functional groups corresponding to the cable to be measured according to the pre-configured fluorescent probe solution, performs functional group detection on the marked cable to be measured, and obtains the fluorescence distribution data corresponding to the cable to be measured.

[0047] In an embodiment of the present application, an infrared spectrum test is performed on the shielding layer of the cable to be measured to obtain the types of functional groups corresponding to the cable to be measured. The corresponding fluorescent probe solution is determined according to the types of functional groups. The functional groups of the cable to be measured are marked based on the fluorescent probe solution. Through a confocal laser scanning microscope, the fluorescence distribution data corresponding to the marked cable to be measured is obtained, where the fluorescence distribution data at least includes the fluorescence emission wavelength and the number of fluorescent functional groups.

[0048] Specifically, an infrared spectrometer is used to test the types of functional groups of the semiconductive shielding layer to obtain the types of functional groups corresponding to the cable to be measured. Different types of functional groups correspond to different probes. The probes can identify and target the functional groups, that is, the probes can identify their corresponding functional groups and bind to their corresponding functional groups. If the probes are processed into fluorescent probes, then when the fluorescent probes bind to the functional groups, the final conjugate will also have fluorescence, which is more convenient for identification and processing. For example, the fluorescent probe in the present application can react with the carbonyl group in the cable to be measured. Therefore, in the embodiment of the present application, after determining the types of functional groups corresponding to the cable to be measured, the corresponding probes are determined according to the types of functional groups. One type of functional group corresponds to one probe. For the cable to be measured, there are as many corresponding probes as there are types of functional groups. Each probe corresponding to a functional group is processed into a fluorescent probe, and then a solution containing the above fluorescent probes is configured, that is, the fluorescent probe solution.

[0049] It should be noted that the process of processing into fluorescent probes and the process of configuring the fluorescent probe solution can both be realized by existing methods or technologies, and the embodiments of the present application will not elaborate here.

[0050] Further, after obtaining the fluorescent probe solution corresponding to the cable to be measured, the cable to be measured is immersed in the fluorescent probe solution for a preset time, so that the fluorescent probes in the fluorescent probe solution have enough time to target the functional groups corresponding to the cable to be measured. After the preset time, the marking process of the cable to be measured is completed.

[0051] Further, the marked cable to be tested is detected by a confocal laser scanning microscope to obtain the fluorescence distribution data corresponding to the marked cable to be tested.

[0052] In an embodiment of the present application, the cable to be tested is subjected to accelerated thermal aging treatment to obtain a second cable specimen to be tested. The second cable specimen to be tested subjected to fluorescence probe labeling and the second cable specimen to be tested not subjected to fluorescence probe labeling are respectively dried. Based on the second cable specimen to be tested subjected to fluorescence probe labeling, a second test slide is obtained. And based on the second test specimen not subjected to fluorescence probe labeling, a third test slide is obtained to obtain the two-dimensional fluorescence distribution by the second test slide and the third test slide. Among them, the second cable specimen to be tested subjected to fluorescence probe labeling is pasted on the second test slide, and the second test specimen not subjected to fluorescence probe labeling is pasted on the third test slide.

[0053] Specifically, in the embodiment of the present application, the test for the fluorescence distribution data of the cable to be tested and the test for the carbon black particle distribution data are carried out separately and independently. Therefore, when testing the fluorescence distribution data of the cable to be tested, a new cable specimen to be tested needs to be established. In the embodiment of the present application, the cable can be subjected to accelerated thermal aging treatment in the laboratory. The cable specimen after thermal aging treatment is segmented and immersed in the fluorescence probe solution. After the test specimen and the fluorescence probe solution react fully, a second cable specimen to be tested subjected to fluorescence probe labeling is obtained. The second cable specimen to be tested subjected to fluorescence probe labeling is dried and pasted on a slide to obtain a second test slide. In addition, in order to compare the obtained second test slide, in the embodiment of the present application, the cable to be tested after thermal aging treatment is segmented, not subjected to fluorescence probe labeling, and the second cable specimen to be tested not subjected to fluorescence probe labeling is pasted on a slide to obtain a third test slide.

[0054] In an embodiment of the present application, two-dimensional imaging is performed on the second test slide by a confocal laser scanning microscope to obtain a first image corresponding to the cable to be tested; and two-dimensional imaging is performed on the third test slide to obtain a second image corresponding to the cable to be tested. The first image and the second image are compared to obtain the fluorescence distribution data corresponding to the first image. By observing the second test slide and the third test slide respectively, the fluorescence distribution in the second test slide can be further determined. In the case where there are parts similar to fluorescence in the cable to be tested itself, it can be prevented from being determined as fluorescence distribution, thereby improving the accuracy of the obtained fluorescence distribution data.

[0055] Further, the embodiment of the present application can use a fluorescence spectrometer to test the cable to be measured, and obtain the fluorescence emission wavelength and fluorescence excitation wavelength corresponding to the cable to be measured. Among them, the fluorescence excitation wavelength configures the relevant parameters of the laser scanning confocal microscope, and the fluorescence emission wavelength is used as the test result and participates in the final aging state determination process.

[0056] S104. The cable aging state identification device determines the aging state of the cable to be measured based on the carbon black particle distribution data and the fluorescence distribution data.

[0057] In an embodiment of the present application, the above two-dimensional image is input into a computer device, and the computer device identifies the number of fluorescent functional groups in the two-dimensional image. At this time, the number of aggregation points corresponding to the cable to be measured, the distance between two adjacent carbon black particles in the aggregation points, the number of fluorescent functional groups, and the fluorescence emission wavelength can be obtained. Through the obtained data, the aging state of the cable to be measured can be judged / determined. In the embodiment of the present application, there are three states of the aging state of the cable to be measured: severe aging state, moderate aging state, and mild aging state. Specifically, the fluorescence emission wavelength is compared with a preset wavelength threshold, and the distance between two adjacent carbon black particles in the aggregation points is compared with a preset distance threshold. If the fluorescence emission wavelength is greater than the preset wavelength threshold and the distance between two adjacent carbon black particles in the aggregation points is greater than the preset distance threshold, it is determined that the cable to be measured is in a severe aging state. Otherwise, based on the number of aggregation points and the number of functional groups, the aging state of the cable to be measured is re-determined.

[0058] Further, in the case where the fluorescence emission wavelength is less than the preset wavelength threshold, and / or the distance between two adjacent carbon black particles in the aggregation points is less than the preset distance threshold, and the number of aggregation points is greater than the first preset number threshold, and / or the number of fluorescent functional groups is greater than the second preset number threshold, it is determined that the cable to be measured is in a moderate aging state. That is, in the case where at least one of the two conditions that the fluorescence emission wavelength is less than the preset wavelength threshold and the distance between two adjacent carbon black particles in the aggregation points is less than the preset distance threshold is satisfied, and at least one of the two conditions that the number of aggregation points is greater than the first preset number threshold and the number of fluorescent functional groups is greater than the second preset number threshold is satisfied, the cable to be measured is in a moderate aging state.

[0059] Further, in the case where the fluorescence emission wavelength is less than the preset wavelength threshold, the distance between two adjacent carbon black particles in the aggregation points is less than the preset distance threshold, the number of aggregation points is less than the first preset number threshold, and the number of fluorescent functional groups is less than the second preset number threshold, it is determined that the cable to be measured is in a mild aging state. Thus, the aging state identification process of the cable to be measured is completed.

[0060] Figure 2The structural schematic diagram of a cable aging state recognition device provided by an embodiment of the present application. As Figure 2 shown, the cable aging state recognition device includes:

[0061] at least one processor; and,

[0062] a memory communicatively connected to the at least one processor; wherein,

[0063] the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can:

[0064] monitor carbon black particles on the shielding layer of the cable to be measured to obtain a carbon black particle distribution image corresponding to the cable to be measured;

[0065] mark agglomeration points on the carbon black particle distribution image, and measure the distance between different carbon black particles in the agglomeration points to obtain carbon black particle distribution data corresponding to the cable to be measured; wherein, the carbon black particle distribution data at least includes the number of marked agglomeration points and the image distance between adjacent two carbon black particles in each agglomeration point;

[0066] mark functional groups corresponding to the cable to be measured according to a pre-configured fluorescent probe solution, perform functional group detection on the marked cable to be measured to obtain fluorescent distribution data corresponding to the cable to be measured;

[0067] determine the aging state of the cable to be measured based on the carbon black particle distribution data and the fluorescent distribution data.

[0068] Each embodiment in the present application is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiments.

[0069] The above describes specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve the desired result. Additionally, the processes depicted in the figures do not necessarily require the specific order or sequential order shown to achieve the desired result. In certain implementations, multitasking and parallel processing are also possible or may be advantageous.

[0070] The above are only the embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included within the scope of the claims of the present application.

Claims

1. A method for identifying the aging state of a cable, characterized in that The method includes: Monitoring carbon black particles on the shielding layer of the cable to be measured to obtain a carbon black particle distribution image corresponding to the cable to be measured; Labeling agglomeration points on the carbon black particle distribution image and measuring the distance between different carbon black particles in the agglomeration points to obtain carbon black particle distribution data corresponding to the cable to be measured; wherein, the carbon black particle distribution data at least includes the number of labeled agglomeration points and the image distance between two adjacent carbon black particles in each agglomeration point; Labeling the functional groups corresponding to the cable to be measured according to a pre-configured fluorescent probe solution, and performing functional group detection on the labeled cable to be measured to obtain fluorescent distribution data corresponding to the cable to be measured; Determining the aging state of the cable to be measured based on the carbon black particle distribution data and the fluorescent distribution data; Before monitoring carbon black particles on the shielding layer of the cable to be measured to obtain a carbon black particle distribution image corresponding to the cable to be measured, the method further includes: Performing accelerated thermal aging treatment on the cable to be measured to obtain a first cable specimen to be measured; Based on the first cable specimen to be measured, obtaining a first slide to be measured; wherein, the first cable specimen to be measured is pasted on the first slide to be measured; The labeling of the agglomeration points on the carbon black particle distribution image specifically includes: Obtaining a plurality of carbon black particle reference agglomeration points in the carbon black particle distribution image; wherein, the distance between any two adjacent carbon black particles in the carbon black particle reference agglomeration points is less than a preset distance; Obtaining the position information of the edge carbon black particles corresponding to the plurality of carbon black particle reference agglomeration points respectively, and calculating the agglomeration area corresponding to the plurality of carbon black particle reference agglomeration points respectively based on the position information of the edge carbon black particles; wherein, the edge carbon black particles are the four carbon black particles at the uppermost, lowermost, leftmost and rightmost positions corresponding to each carbon black particle reference agglomeration point respectively; Labeling the carbon black particle reference agglomeration points with an agglomeration area greater than a preset agglomeration area; The labeling of the functional groups corresponding to the cable to be measured according to a pre-configured fluorescent probe solution, and performing functional group detection on the labeled cable to be measured to obtain fluorescent distribution data corresponding to the cable to be measured specifically includes: Performing infrared spectroscopy test on the shielding layer of the cable to be measured to obtain the types of functional groups corresponding to the cable to be measured; Determining the corresponding fluorescent probe solution according to the types of functional groups; Labeling the functional groups of the cable to be measured based on the fluorescent probe solution; Obtaining the fluorescent distribution data corresponding to the labeled cable to be measured through a confocal laser scanning microscope; wherein, the fluorescent distribution data at least includes the fluorescence emission wavelength and the number of fluorescent functional groups; The determining the aging state of the cable to be measured based on the carbon black particle distribution data and the fluorescent distribution data specifically includes: Comparing the fluorescence emission wavelength with a preset wavelength threshold; and comparing the distance between two adjacent carbon black particles in the agglomeration points with a preset distance threshold; If the fluorescence emission wavelength is greater than the preset wavelength threshold and the distance between two adjacent carbon black particles in the agglomeration point is greater than the preset distance threshold, it is determined that the cable under test is in a severely aged state; Otherwise, based on the number of the marked agglomeration points and the number of the fluorescent functional groups, re-determine the aging state of the cable under test; The re-determination of the aging state of the cable under test based on the number of the agglomeration points and the number of the functional groups specifically includes: When the fluorescence emission wavelength is less than the preset wavelength threshold, and / or the distance between two adjacent carbon black particles in the agglomeration point is less than the preset distance threshold; and the number of the agglomeration points is greater than the first preset number threshold, and / or the number of the fluorescent functional groups is greater than the second preset number threshold, it is determined that the cable under test is in a moderately aged state; When the fluorescence emission wavelength is less than the preset wavelength threshold, and the distance between two adjacent carbon black particles in the agglomeration point is less than the preset distance threshold; and the number of the agglomeration points is less than the first preset number threshold, and the number of the fluorescent functional groups is less than the second preset number threshold, it is determined that the cable under test is in a slightly aged state.

2. The method for identifying the aging state of a cable according to claim 1, wherein, The detection of carbon black particles on the shielding layer of the cable under test to obtain the carbon black particle distribution image corresponding to the cable under test specifically includes: Monitor the first test slide by a bench-top scanning electron microscope, upload the monitored image to a computer, and identify the carbon black particles in the image by the computer to obtain the carbon black particle distribution image corresponding to the cable under test.

3. A method for identifying the aging state of a cable according to claim 1, characterized in that, The calculation of the agglomeration area corresponding to each of the multiple carbon black particle reference agglomeration points based on the position information of the edge carbon black particles specifically includes: Determine a first horizontal line based on the uppermost carbon black particle and a second horizontal line based on the lowermost carbon black particle; and Determine a first vertical line based on the leftmost carbon black particle and a second vertical line based on the rightmost carbon black particle; Determine the circumscribed rectangle corresponding to the carbon black particle reference agglomeration point according to the first horizontal line, the second horizontal line, the first vertical line and the second vertical line; Determine the area of the inscribed circle corresponding to the circumscribed rectangle and use the area of the inscribed circle as the agglomeration area of the carbon black particle reference agglomeration point.

4. A method for identifying the aging state of a cable according to claim 1, characterized in that, Before obtaining the fluorescence distribution data corresponding to the marked cable under test by a confocal laser scanning microscope, the method further includes: Perform an accelerated thermal aging treatment on the cable under test to obtain a second cable specimen under test; Respectively perform a drying treatment on the second cable specimen under test with fluorescence probe labeling and the second cable specimen under test without fluorescence probe labeling; Based on the second cable specimen under test with fluorescence probe labeling, obtain a second test slide; and based on the second cable specimen under test without fluorescence probe labeling, obtain a third test slide, so as to obtain the distribution of two-dimensional fluorescence through the second test slide and the third test slide; Among them, the second cable specimen to be tested for which fluorescence probe labeling is performed is pasted on the second glass slide to be tested, and the second cable specimen to be tested without fluorescence probe labeling is pasted on the third glass slide to be tested.

5. A method for identifying the aging state of a cable according to claim 4, characterized in that, The fluorescence distribution corresponding to the cable to be tested after labeling is obtained by a confocal laser scanning microscope, which specifically includes: Performing two-dimensional imaging on the second glass slide to be tested by the confocal laser scanning microscope to obtain a first image corresponding to the cable to be tested; and performing two-dimensional imaging on the third glass slide to be tested to obtain a second image corresponding to the cable to be tested; Comparing the first image with the second image to obtain the fluorescence distribution data corresponding to the cable to be tested after labeling.

6. A cable aging state identification device, comprising: At least one processor; And, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to: Monitor carbon black particles on the shielding layer of the cable to be tested to obtain a carbon black particle distribution image corresponding to the cable to be tested; Mark the agglomeration points on the carbon black particle distribution image and measure the distance between different carbon black particles in the agglomeration points to obtain carbon black particle distribution data corresponding to the cable to be tested; wherein, the carbon black particle distribution data at least includes the number of marked agglomeration points and the image distance between two adjacent carbon black particles in each agglomeration point; Label the functional groups corresponding to the cable to be tested according to a pre-configured fluorescence probe solution, and perform functional group detection on the cable to be tested after labeling to obtain fluorescence distribution data corresponding to the cable to be tested; Determine the aging state of the cable to be tested based on the carbon black particle distribution data and the fluorescence distribution data; Before detecting the carbon black particles on the shielding layer of the cable to be tested to obtain a carbon black particle distribution image corresponding to the cable to be tested, it further includes: Performing accelerated thermal aging treatment on the cable to be tested to obtain a first cable specimen to be tested; Based on the first cable specimen to be tested, obtaining a first glass slide to be tested; wherein, the first cable specimen to be tested is pasted on the first glass slide to be tested; The marking of the agglomeration points on the carbon black particle distribution image specifically includes: Obtaining a plurality of carbon black particle reference agglomeration points in the carbon black particle distribution image; wherein, the distance between any two adjacent carbon black particles in the carbon black particle reference agglomeration points is less than a preset distance; Obtaining the position information of the edge carbon black particles corresponding to the plurality of carbon black particle reference agglomeration points respectively, so as to calculate the agglomeration area corresponding to the plurality of carbon black particle reference agglomeration points respectively based on the position information of the edge carbon black particles; wherein, the edge carbon black particles are the four carbon black particles at the uppermost, lowermost, leftmost and rightmost positions respectively corresponding to each carbon black particle reference agglomeration point; Marking the carbon black particle reference agglomeration points with an agglomeration area greater than the preset agglomeration area; Label the functional groups corresponding to the cable under test according to the pre-configured fluorescent probe solution, and perform functional group detection on the labeled cable under test to obtain the fluorescence distribution data corresponding to the cable under test, which specifically includes: Perform infrared spectroscopy testing on the shielding layer of the cable under test to obtain the types of functional groups corresponding to the cable under test; Determine the corresponding fluorescent probe solution according to the types of functional groups; Perform functional group labeling on the cable under test based on the fluorescent probe solution; Obtain the fluorescence distribution data corresponding to the labeled cable under test through a confocal laser scanning microscope; wherein, the fluorescence distribution data at least includes the fluorescence emission wavelength and the number of fluorescent functional groups; Based on the carbon black particle distribution data and the fluorescence distribution data, determine the aging state of the cable under test, which specifically includes: Compare the fluorescence emission wavelength with a preset wavelength threshold; and compare the distance between two adjacent carbon black particles in the agglomeration point with a preset distance threshold; If the fluorescence emission wavelength is greater than the preset wavelength threshold, and the distance between two adjacent carbon black particles in the agglomeration point is greater than the preset distance threshold, it is determined that the cable under test is in a severely aged state; Otherwise, re-determine the aging state of the cable under test based on the number of the marked agglomeration points and the number of fluorescent functional groups; Based on the number of the agglomeration points and the number of functional groups, re-determine the aging state of the cable under test, which specifically includes: When the fluorescence emission wavelength is less than the preset wavelength threshold, and / or the distance between two adjacent carbon black particles in the agglomeration point is less than the preset distance threshold; and the number of agglomeration points is greater than a first preset number threshold, and / or the number of fluorescent functional groups is greater than a second preset number threshold, it is determined that the cable under test is in a moderately aged state; When the fluorescence emission wavelength is less than the preset wavelength threshold, and the distance between two adjacent carbon black particles in the agglomeration point is less than the preset distance threshold; and the number of agglomeration points is less than a first preset number threshold, and the number of fluorescent functional groups is less than a second preset number threshold, it is determined that the cable under test is in a slightly aged state.

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