Method, device and equipment for evaluating cable aging state and readable storage medium
By collecting partial discharge phase analysis (PRPD) spectra of cables throughout their entire life cycle, partial discharge assessment indicators for cables are determined, solving the problem of assessing cable aging status, providing guidance for reasonable replacement timing, saving resources, and reducing safety hazards.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CRRC QINGDAO SIFANG CO LTD
- Filing Date
- 2022-12-15
- Publication Date
- 2026-05-12
AI Technical Summary
The lack of mature methods for assessing cable aging status in current technology leads to the inability to replace cables at the appropriate time, resulting in resource waste and safety hazards.
By collecting partial discharge phase analysis (PRPD) spectra throughout the entire life cycle of the cable, partial discharge assessment indicators are determined, and the partial discharge assessment indicators of the cable under test are calculated. The service life of the cable is then assessed based on the partial discharge situation to guide the appropriate replacement timing.
It enables the assessment of the aging status of cables based on partial discharge, guiding the appropriate replacement time, saving resources and reducing safety hazards.
Smart Images
Figure CN115856543B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power safety, and in particular to a method for assessing the aging condition of cables. This invention also relates to an apparatus, device, and computer-readable storage medium for assessing the aging condition of cables. Background Technology
[0002] Cables are used to transmit electrical energy and are widely used in various industries, such as rail vehicles. As the service time increases, cables will gradually age, and cable aging is accompanied by safety hazards. When the aging is serious, the cable must be replaced in time to avoid safety accidents. However, there is no mature assessment method for cable aging in the current technology, which makes it impossible to replace the cable at the appropriate time. This results in both resource waste and safety hazards.
[0003] Therefore, how to provide a solution to the above-mentioned technical problems is a problem that needs to be solved by those skilled in the art. Summary of the Invention
[0004] The purpose of this invention is to provide a method for assessing the aging state of cables. This method utilizes the partial discharge characteristics of the cable under test to evaluate its service life, thereby assessing its aging state and guiding the determination of a more appropriate replacement time for the cable, which helps save resources and reduce safety hazards. Another purpose of this invention is to provide a device, equipment, and computer-readable storage medium for assessing the aging state of cables. This method utilizes the partial discharge characteristics of the cable under test to evaluate its service life, thereby assessing its aging state and guiding the determination of a more appropriate replacement time for the cable, which helps save resources and reduce safety hazards.
[0005] To address the aforementioned technical problems, this invention provides a method for assessing the aging state of cables, comprising:
[0006] Partial discharge phase analysis (PRPD) spectra of the target type of cable at multiple service years throughout its entire life cycle;
[0007] Based on the PRPD map, the partial discharge assessment indexes for the target type of cable at different service years throughout its entire life cycle were determined.
[0008] Calculate the partial discharge evaluation index of the cable under test of the target type, and use the calculation result as the partial discharge evaluation index of the cable under test;
[0009] The service life corresponding to the partial discharge evaluation index that is closest to the evaluation index to be tested shall be taken as the evaluation service life of the cable to be tested.
[0010] Preferably, the step of determining the partial discharge assessment index for the target type of cable at different service years throughout its entire life cycle based on the PRPD map specifically involves:
[0011] Each of the PRPD maps is converted to grayscale values.
[0012] Based on the PRPD map after grayscale numerical processing, the partial discharge evaluation index of the target type of cable at different service years throughout its entire life cycle is determined.
[0013] Preferably, the step of determining the partial discharge assessment index for the target type of cable at different service years throughout its entire life cycle based on the PRPD map after grayscale numerical processing specifically involves:
[0014] The PRPD map after grayscale numerical processing is decomposed into multiple scales.
[0015] Based on the PRPD map after multi-scale decomposition, the partial discharge assessment indexes of the target type of cable at different service years throughout its entire life cycle are determined.
[0016] Preferably, the grayscale numerical processing of each of the PRPD maps specifically involves:
[0017]
[0018] Among them, P a For the PRPD spectrum of the target type cable with a service life of a, RP a (m, n) is P a The red pixel value at pixel coordinates (m, n), GP a (m, n) is P a The green pixel value at pixel coordinates (m, n), BP a (m, n) is P a The blue pixel value at pixel coordinates (m, n), G a (m, n) is P a The gray value at pixel coordinates (m, n); m and n are P a The x and y coordinates of a pixel.
[0019] Preferably, the step of performing multi-scale decomposition on the PRPD map after grayscale numerical processing specifically involves:
[0020]
[0021]
[0022]
[0023] Among them, G (a，1) (m1, n1) is the first-order decomposition map G. (a，1) The gray value at pixel coordinates (m1, n1); G (a，2) (m2, n2) is the second-order decomposition map G. (a，2) The gray value at pixel coordinates (m2, n2); G (a，3) (m3, n3) represents the tertiary decomposition map G. (a，3) The gray value at pixel coordinates (m3, n3), α1∈m, β1∈n, and α1 and β1 are even numbers, where m1 and n1 are the spectral values of G. (a，1) The x and y coordinates of the pixels, m1 and n1 are both real numbers; α2∈m1, β2∈n1, and α2 and β2 are even numbers, m2 and n2 are the graphs G. (a，2) The x and y coordinates of the pixels, m2 and n2 are both real numbers; α3∈m2, β3∈n2, and α3 and β3 are even numbers, m3 and n3 are the graphs G. (a，3) The horizontal and vertical coordinates of the pixel, m3 and n3 are all real numbers.
[0024] Preferably, the step of determining the partial discharge assessment index for the target type of cable at different service years throughout its entire life cycle based on the PRPD map after multi-scale decomposition specifically involves:
[0025]
[0026] Where η is the partial discharge evaluation index, and a is an integer and a∈[1,k].
[0027] Preferably, the method for assessing the aging state of the cable after taking the service life corresponding to the partial discharge assessment index that is closest to the partial discharge assessment index to be tested as the assessment service life of the cable to be tested further includes:
[0028] When the evaluated service life exceeds a preset threshold, the control prompt will indicate that the cable under test needs to be replaced.
[0029] To address the aforementioned technical problems, the present invention also provides a device for assessing the aging state of cables, comprising:
[0030] The acquisition module is used to acquire partial discharge phase analysis (PRPD) maps of the target type of cable at multiple different service years throughout its entire life cycle.
[0031] The determination module is used to determine the partial discharge assessment index of the target type of cable for different service years throughout its entire life cycle, based on the PRPD map.
[0032] The calculation module is used to calculate the partial discharge evaluation index of the target type cable under test, and use the calculation result as the partial discharge evaluation index under test.
[0033] The evaluation module is used to take the service life corresponding to the partial discharge evaluation index that is closest to the evaluation index of the partial discharge to be tested as the evaluation service life of the cable to be tested.
[0034] To address the aforementioned technical problems, the present invention also provides a device for assessing the aging condition of cables, comprising:
[0035] Memory, used to store computer programs;
[0036] A processor is used to implement the steps of the method for assessing the aging state of cables as described above when executing the computer program.
[0037] To address the aforementioned technical problems, the present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the cable aging condition assessment method described above.
[0038] This invention provides a method for assessing the aging state of cables. Considering that partial discharge patterns (PRPD) can reflect the partial discharge status of cables, this application can pre-collect PRPD patterns of the target type of cable at multiple different service years throughout its entire life cycle. Based on the PRPD patterns, the partial discharge assessment index of the target type of cable at each different service year is determined. Then, the partial discharge assessment index of the cable under test is calculated. Finally, the partial discharge assessment index is matched with the partial discharge assessment indices of the target type of cable to determine the estimated service life of the cable under test. That is, this application does not refer to the actual service life, but uses the partial discharge status of the cable under test to assess its service life in order to evaluate its aging state. This can guide the determination of a more reasonable replacement time for the cable under test, which is beneficial for saving resources and reducing safety hazards.
[0039] The present invention also provides an apparatus, device and computer-readable storage medium for assessing the aging condition of cables, which have the same beneficial effects as the above-mentioned method for assessing the aging condition of cables. Attached Figure Description
[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0041] Figure 1 A flowchart illustrating a method for assessing the aging state of cables provided by this invention;
[0042] Figure 2 A schematic diagram of the structure of a cable aging condition assessment device provided by the present invention;
[0043] Figure 3 This is a schematic diagram of the structure of a cable aging condition assessment device provided by the present invention. Detailed Implementation
[0044] The core of this invention is to provide a method for assessing the aging state of cables. This method utilizes the partial discharge characteristics of the cable under test to evaluate its service life, thereby assessing its aging state and guiding the determination of a more appropriate replacement time for the cable, which helps save resources and reduce safety hazards. Another objective of this invention is to provide a device, equipment, and computer-readable storage medium for assessing the aging state of cables. This method utilizes the partial discharge characteristics of the cable under test to evaluate its service life, thereby assessing its aging state and guiding the determination of a more appropriate replacement time for the cable, which helps save resources and reduce safety hazards.
[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0046] Please refer to Figure 1 , Figure 1 The present invention provides a flowchart illustrating a method for assessing the aging condition of a cable, which includes:
[0047] S101: Collect partial discharge phase analysis (PRPD) maps of the target type of cable at multiple different service years throughout its entire life cycle;
[0048] Specifically, considering the technical issues mentioned above, and taking into account that PRPD (Phase Resolved Partial Discharge) maps can reflect the partial discharge status of cables, this application aims to determine the partial discharge assessment indicators for the target type of cable at multiple different service years throughout its entire lifespan based on PRPD maps of the target type cable at multiple different service years. Then, by matching the partial discharge assessment indicators of the cable under test with the various partial discharge assessment indicators of the target type cable, the estimated service life of the cable under test can be determined. This method uses the partial discharge status of the cable under test to assess its service life, rather than directly using its actual service life, making it more meaningful and guiding the determination of a more reasonable replacement time for the cable under test. This helps save resources and reduce safety hazards. Therefore, in this step, PRPD maps of the target type cable at multiple different service years throughout its entire lifespan can be collected first to serve as the data basis for subsequent steps.
[0049] Specifically, collecting partial discharge phase analysis (PRPD) maps of the target cable at multiple different service years throughout its entire life cycle can be:
[0050] Throughout the entire life cycle, a voltage of 25kV was applied to the target type of cable and PRPD patterns were collected.
[0051] The total number of data collections can be k, and the labels of the collected PRPD maps can be denoted as P. a , where a represents the PRPD map collected in the a-th time, a is an integer and a∈[1,k], where k can be greater than or equal to 30.
[0052] S102: Based on the PRPD map, determine the partial discharge assessment index for the target type of cable at different service years throughout its entire life cycle;
[0053] Specifically, in order to quickly use a unified index for comparison in subsequent steps to determine the estimated service life of the cable under test, a partial discharge assessment index is designed in this embodiment of the invention. Based on the PRPD spectrum, the partial discharge assessment index of the target type of cable at different service lifespans can be determined and used as the data basis for subsequent steps. This partial discharge assessment index can assess the degree of partial discharge of the cable under fixed conditions.
[0054] S103: Calculate the partial discharge evaluation index of the target type cable under test, and use the calculation result as the partial discharge evaluation index of the cable under test;
[0055] Specifically, before assessing the aging status of the cable under test, it is necessary to determine the partial discharge assessment indicators for the target type of cable corresponding to the cable under test at different service years throughout its entire life cycle.
[0056] Specifically, in order to facilitate matching, the partial discharge evaluation index of the target type cable under test can be calculated in this embodiment of the invention, and the calculation result can be used as the partial discharge evaluation index under test, so as to serve as the data basis for subsequent steps.
[0057] In calculating the partial discharge evaluation index to be tested, the method described above can also be used, that is, the index can be calculated using the PRPD spectrum. This embodiment of the invention does not limit the scope of the invention.
[0058] S104: The service life corresponding to the partial discharge evaluation index that is closest to the evaluation index of the partial discharge to be tested shall be used as the evaluation service life of the cable to be tested.
[0059] Specifically, after obtaining the partial discharge assessment index to be tested, it can be matched with the partial discharge assessment index of the target type of cable to determine the assessment service life of the cable under test.
[0060] The cable under test has an actual service life from the time of its commissioning to the present time. However, due to differences in usage time or its own quality, this actual service life is difficult to accurately reflect the aging state of the cable under test. This application takes into account that as aging worsens, the partial discharge of the cable also becomes more severe. Therefore, the embodiments of this invention can use partial discharge evaluation indicators to evaluate the service life of the cable under test, so as to use it as the aging state evaluation result of the cable under test and guide the determination of the cable replacement time. This helps to determine a more reasonable replacement time for the cable, thereby saving resources and reducing safety hazards.
[0061] It is worth mentioning that the cable can be of various types, such as the on-board cable of a rail vehicle, etc., and the embodiments of the present invention are not limited to these.
[0062] In addition, it is worth mentioning that, in order to facilitate the assessment of the aging status of various types of cables under test, the embodiments of the present invention can pre-collect PRPD maps of multiple target types and store them in a database. Then, when it is necessary to assess the aging status of the cable under test, the corresponding PRPD map of the cable under test can be found in the database for matching and assessment, which helps to improve work efficiency.
[0063] This invention provides a method for assessing the aging state of cables. Considering that partial discharge patterns (PRPD) can reflect the partial discharge status of cables, this application can pre-collect PRPD patterns of the target type of cable at multiple different service years throughout its entire life cycle. Based on the PRPD patterns, the partial discharge assessment index of the target type of cable at each different service year is determined. Then, the partial discharge assessment index of the cable under test is calculated. Finally, the partial discharge assessment index is matched with the partial discharge assessment indices of the target type of cable to determine the estimated service life of the cable under test. That is, this application does not refer to the actual service life, but uses the partial discharge status of the cable under test to assess its service life in order to evaluate its aging state. This can guide the determination of a more reasonable replacement time for the cable under test, which is beneficial for saving resources and reducing safety hazards.
[0064] Based on the above embodiments:
[0065] As a preferred embodiment, based on the PRPD map, the specific partial discharge assessment indicators for the target type of cable at different service years throughout its entire life cycle are determined as follows:
[0066] Each PRPD map is converted to grayscale numerical values.
[0067] Based on the PRPD map after grayscale numerical processing, the partial discharge assessment index of the target type of cable at different service years throughout its entire life cycle is determined.
[0068] Specifically, considering that "color" does not play a significant role in the subsequent analysis and calculation of PRPD maps, in order to reduce the amount of data processing required for the subsequent analysis and calculation of PRPD maps, each PRPD map can be processed into grayscale values. This allows for the determination of partial discharge evaluation indicators for the target type of cable at different service lifespans based on the grayscale-processed PRPD maps, thereby reducing the amount of data processing and improving calculation efficiency.
[0069] As a preferred embodiment, based on the PRPD map after grayscale numerical processing, the specific partial discharge evaluation indicators for the target type of cable at different service years throughout its entire life cycle are determined as follows:
[0070] The PRPD map after grayscale numerical processing is decomposed into multiple scales.
[0071] Based on the PRPD map after multi-scale decomposition, the partial discharge assessment indexes of the target type of cable at different service years throughout its entire life cycle were determined.
[0072] Specifically, considering that the information reflected by a single-dimensional PRPD map is relatively limited, in order to mine information from multiple dimensions in the PRPD map, this embodiment of the invention can decompose the PRPD map after grayscale numerical processing into multiple scales to obtain PRPD maps at different scales (i.e., different resolutions). This allows subsequent steps to determine the partial discharge assessment index of the target type of cable at different service years throughout its entire life cycle based on the PRPD map after multi-scale decomposition. Since information from multiple dimensions in the PRPD map is mined and utilized, the final partial discharge assessment index can be made more reliable, which is beneficial to improving the accuracy of cable aging status assessment.
[0073] As a preferred embodiment, the grayscale numerical processing of each PRPD map is specifically performed as follows:
[0074]
[0075] Among them, P a For the PRPD spectrum of the target type cable with a service life of a, RP a (m, n) is P a The red pixel value at pixel coordinates (m, n), GP a (m, n) is P a The green pixel value at pixel coordinates (m, n), BP a (m, n) is P a The blue pixel value at pixel coordinates (m, n), G a (m, n) is P a The gray value at pixel coordinates (m, n); m and n are P a The x and y coordinates of a pixel.
[0076] Specifically, using the method in the above formula for grayscale numerical processing has the advantages of fast calculation speed and high accuracy.
[0077] The numerical ranges of m and n can be m∈[1, 64] and n∈[1, 64].
[0078] Of course, in addition to the above methods, other methods can be used to perform grayscale numerical processing on each PRPD map, and the embodiments of the present invention are not limited here.
[0079] As a preferred embodiment, the multi-scale decomposition of the PRPD map after grayscale numerical processing is specifically as follows:
[0080]
[0081]
[0082]
[0083] Among them, G (a，1) (m1, n1) is the first-order decomposition map G. (a，1) The gray value at pixel coordinates (m1, n1); G (a，2) (m2, n2) is the second-order decomposition map G. (a，2) The gray value at pixel coordinates (m2, n2); G (a，3) (m3, n3) represents the tertiary decomposition map G. (a，3) The gray value at pixel coordinates (m3, n3), α1∈m, β1∈n, and α1 and β1 are even numbers, where m1 and n1 are the spectral values of G. (a，1) The x and y coordinates of the pixels, m1 and n1 are both real numbers; α2∈m1, β2∈n1, and α2 and β2 are even numbers, m2 and n2 are the graphs G. (a，2) The x and y coordinates of the pixels, m2 and n2 are both real numbers; α3∈m2, β3∈n2, and α3 and β3 are even numbers, m3 and n3 are the graphs G. (a，3) The horizontal and vertical coordinates of the pixel, m3 and n3 are all real numbers.
[0084] Specifically, in order to balance the computational load and the precision of multi-scale decomposition, the PRPD map was decomposed into three levels in this embodiment of the invention. As can be seen from the above calculation formula, the pixel coordinates of the previous level can be halved in each decomposition process.
[0085] Of course, in addition to the specific process described above, multi-scale decomposition of the PRPD map after grayscale numerical processing can be performed in other specific ways, and the embodiments of the present invention are not limited here.
[0086] As a preferred embodiment, based on the PRPD map after multi-scale decomposition, the specific partial discharge evaluation indicators for the target type of cable at different service years throughout its entire life cycle are determined as follows:
[0087]
[0088] Where η is the partial discharge evaluation index, and a is an integer and a∈[1,k].
[0089] Specifically, the partial discharge assessment index in this embodiment of the invention effectively integrates the PRPD spectrum after grayscale numerical processing and multi-scale decomposition, which can efficiently calculate the partial discharge assessment index and has high reference value, making it convenient to assess the aging state of cables.
[0090] Of course, in addition to this specific method, other methods can also be used to "determine the partial discharge evaluation index of the target type of cable at different service years throughout its entire life cycle based on the PRPD map after multi-scale decomposition". This embodiment of the invention does not limit the specific methods.
[0091] As a preferred embodiment, after taking the service life corresponding to the partial discharge evaluation index that is closest to the evaluation index to be tested as the evaluation service life of the cable under test, the method for evaluating the aging state of the cable further includes:
[0092] When the service life of the cable under test exceeds a preset threshold, the control prompt will indicate that the cable needs to be replaced.
[0093] Specifically, considering that the assessment of service life can be directly equivalent to the assessment of aging status, and in order to facilitate the staff to understand the situation in a timely manner and replace the cable under test when the aging status of the cable under test is relatively serious, a preset threshold is set in this embodiment of the invention, and when the assessment of service life is greater than the preset threshold, the control prompt will prompt the cable under test to be replaced.
[0094] The preset threshold can be set independently, and this embodiment of the invention does not limit it.
[0095] Specifically, the prompter can be of various types, such as a combination of a local prompter and a network terminal, so as to provide prompts on both the local and network terminal sides at the same time. This embodiment of the invention does not limit the types of prompters.
[0096] Please refer to Figure 2 , Figure 2 The present invention provides a schematic diagram of a cable aging condition assessment device, which includes:
[0097] Acquisition module 21 is used to acquire partial discharge phase analysis (PRPD) maps of the target type of cable at multiple different service years throughout its entire life cycle;
[0098] Module 22 is used to determine the partial discharge assessment index of the target type of cable for different service years throughout its entire life cycle based on the PRPD map.
[0099] Calculation module 23 is used to calculate the partial discharge evaluation index of the target type cable under test, and use the calculation result as the partial discharge evaluation index of the cable under test;
[0100] Evaluation module 24 is used to take the service life corresponding to the partial discharge evaluation index that is closest to the evaluation index of the partial discharge to be tested as the evaluation service life of the cable to be tested.
[0101] For a description of the cable aging condition assessment device provided in this embodiment of the invention, please refer to the aforementioned embodiment of the cable aging condition assessment method. This embodiment of the invention is not limited here.
[0102] Please refer to Figure 3 , Figure 3 The present invention provides a structural schematic diagram of a cable aging condition assessment device, which includes:
[0103] Memory 31 is used to store computer programs;
[0104] The processor 32 is used to implement the steps of the cable aging condition assessment method as described in the foregoing embodiments when executing a computer program.
[0105] For a description of the cable aging condition assessment device provided in this embodiment of the invention, please refer to the aforementioned embodiment of the cable aging condition assessment method. This embodiment of the invention is not limited here.
[0106] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the cable aging condition assessment method as described in the foregoing embodiments.
[0107] For a description of the computer-readable storage medium provided in the embodiments of the present invention, please refer to the aforementioned embodiments of the cable aging condition assessment method. The embodiments of the present invention are not limited here.
[0108] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should also be noted that in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0109] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A method for assessing the aging condition of cables, characterized in that, include: Partial discharge phase analysis (PRPD) spectra of the target type of cable at multiple service years throughout its entire life cycle; Each of the PRPD maps is converted to grayscale values. The PRPD map after grayscale numerical processing is decomposed into multiple scales. Based on the PRPD map after multi-scale decomposition, the partial discharge evaluation indexes of the target type of cable at different service years throughout its entire life cycle were determined. Calculate the partial discharge evaluation index of the cable under test of the target type, and use the calculation result as the partial discharge evaluation index of the cable under test; The service life corresponding to the partial discharge evaluation index that is closest to the evaluation index to be tested shall be taken as the evaluation service life of the cable to be tested.
2. The method for assessing the aging state of cables according to claim 1, characterized in that, The specific steps for performing grayscale numerical processing on each of the PRPD maps are as follows: ； in, PRPD spectrum for target type cable with a service life of a. yes At pixel coordinates The red pixel value at that location, yes At pixel coordinates Green pixel value, yes At pixel coordinates The value of the blue pixel. yes At pixel coordinates The gray values at the given locations; m and n are respectively... The x and y coordinates of a pixel.
3. The method for assessing the aging state of cables according to claim 2, characterized in that, The specific steps of performing multi-scale decomposition on the PRPD map after grayscale numerical processing are as follows: ； ； ； in, First-order decomposition map At pixel coordinates The grayscale value at that location; Secondary decomposition map At pixel coordinates The grayscale value at that location; A three-level decomposition map At pixel coordinates grayscale value at that location , ,and as well as If the numbers are even, m1 and n1 are the spectra. The horizontal and vertical coordinates of the pixel, m1 and n1 are both real numbers; , ,and as well as Since the numbers are even, m2 and n2 are the spectra respectively. The horizontal and vertical coordinates of the pixel, m2 and n2 are all real numbers; , ,and as well as Since the numbers are even, m3 and n3 are the spectra. The horizontal and vertical coordinates of the pixel, m3 and n3 are all real numbers.
4. The method for assessing the aging state of cables according to claim 3, characterized in that, The partial discharge assessment index for the target type of cable at different service years throughout its entire life cycle is determined based on the PRPD map after multi-scale decomposition as follows: ； in, The partial discharge assessment index is... Integer and .
5. The method for assessing the aging condition of cables according to any one of claims 1 to 4, characterized in that, The method for assessing the aging state of a cable after taking the service life corresponding to the partial discharge assessment index that is closest to the partial discharge assessment index to be tested as the assessment service life of the cable to be tested further includes: When the evaluated service life exceeds a preset threshold, the control prompt will indicate that the cable under test needs to be replaced.
6. A device for assessing the aging condition of cables, characterized in that, include: The acquisition module is used to acquire partial discharge phase analysis (PRPD) maps of the target type of cable at multiple different service years throughout its entire life cycle. The determination module is used to perform grayscale numerical processing on each of the PRPD maps; to perform multi-scale decomposition on the PRPD maps after grayscale numerical processing; and to determine the partial discharge evaluation index of the target type of cable for different service years throughout its entire life cycle based on the PRPD maps after multi-scale decomposition. The calculation module is used to calculate the partial discharge evaluation index of the target type cable under test, and use the calculation result as the partial discharge evaluation index under test. The evaluation module is used to take the service life corresponding to the partial discharge evaluation index that is closest to the evaluation index of the partial discharge to be tested as the evaluation service life of the cable to be tested.
7. A device for assessing the aging condition of cables, characterized in that, include: Memory, used to store computer programs; A processor for executing the computer program to implement the steps of the method for assessing the aging condition of a cable as described in any one of claims 1 to 5.
8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the cable aging condition assessment method as described in any one of claims 1 to 5.