A 10 kV cross-linked polyethylene cable degradation degree assessment method, terminal and storage medium based on multi-dimensional degradation coefficient

Abstract

The present invention belongs to the technical field of cable insulation degradation degree detection, and specifically provides a 10 kV cross-linked polyethylene cable degradation degree assessment method, terminal and storage medium based on a multi-dimensional degradation coefficient, including: performing partial discharge test, leakage current test and broadband dielectric spectrum test on a target 10 kV cross-linked polyethylene cable, collecting partial discharge data, leakage current data and dielectric loss real part and dielectric loss imaginary part data of the cable at multiple frequencies; calculating a multi-dimensional degradation coefficient τ based on the collected partial discharge data, leakage current data, dielectric loss real part and dielectric loss imaginary part data; evaluating the insulation degradation degree of the target cable based on the multi-dimensional degradation coefficient τ. The present invention can accurately calculate the multi-dimensional degradation coefficient of the cable through the collection and analysis of multi-dimensional data, thereby accurately reflecting the insulation degradation of the cable, and helping to timely discover potential faults of the cable.

Description

Technical Field

[0001] The present invention belongs to the technical field of cable insulation degradation degree detection, and specifically relates to a 10 kV cross-linked polyethylene cable degradation degree assessment method based on multi-dimensional degradation coefficients, a terminal and a storage medium. Background Art

[0002] Cross-linked polyethylene cable is a cable suitable for distribution network and other fields. It uses chemical or physical methods to transform the cable insulation polyethylene molecules from linear molecular structure to main mesh molecular structure, that is, thermoplastic polyethylene is transformed into thermosetting cross-linked polyethylene, thereby greatly improving its heat resistance and mechanical properties, reducing its shrinkage, making it no longer melt after being heated, and maintaining excellent electrical properties. It has advantages that PVC (Polyvinyl chloride, polyvinyl chloride) insulated cables cannot match. It has simple structure, light weight, good heat resistance, strong load capacity, no melting, chemical corrosion resistance, and high mechanical strength.

[0003] Cross-linked polyethylene cables are widely used in 10kV distribution lines. During the long-term operation of the distribution network, the load current passes through the cable core of the cross-linked polyethylene cable for a long time, generating a large amount of heat, which causes the cross-linked polyethylene material of the cable insulation layer to deteriorate. As the service time of 10kV cross-linked polyethylene cables increases, the degree of cross-linked polyethylene insulation degradation becomes more and more serious, which has a significant impact on the safe and reliable operation of the distribution network. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a 10 kV cross-linked polyethylene cable degradation degree assessment method, terminal and storage medium based on multi-dimensional degradation coefficients to solve the above-mentioned technical problems.

[0005] In a first aspect, the present invention provides a method for evaluating the degradation degree of a 10 kV cross-linked polyethylene cable based on a multi-dimensional degradation coefficient, comprising:

[0006] Conduct partial discharge test and leakage current test on the target 10 kV cross-linked polyethylene cable, and collect partial discharge data and leakage current data of the target 10 kV cross-linked polyethylene cable;

[0007] Conduct broadband dielectric spectrum test on the target 10 kV cross-linked polyethylene cable, and collect the real part and imaginary part data of dielectric loss of the target 10 kV cross-linked polyethylene cable at multiple frequencies;

[0008] According to the collected partial discharge data, leakage current data, real part of dielectric loss and imaginary part of dielectric loss data of the target 10 kV cross-linked polyethylene cable, the multi-dimensional degradation coefficient τ of the target 10 kV cross-linked polyethylene cable is calculated;

[0009] The insulation degradation degree of the target 10 kV cross-linked polyethylene cable was evaluated according to the multi-dimensional degradation coefficient τ.

[0010] A further improvement of the technical solution is that a partial discharge test is performed on a target 10 kV cross-linked polyethylene cable, and a specific method for collecting partial discharge data of the target 10 kV cross-linked polyethylene cable is as follows:

[0011] The target 10 kV cross-linked polyethylene cable was subjected to 10 partial discharge tests. The test voltage started from 2 kV and changed stepwise to 20 kV in 2 kV steps. ={2, 4, 6, …, 20}, unit: kV, where i represents the i-th partial discharge test, and i={1, 2, …, 10}, the partial discharge data collected from the target 10 kV cross-linked polyethylene cable is recorded as , unit: coulomb.

[0012] A further improvement of the technical solution is that a leakage current test is performed on the target 10 kV cross-linked polyethylene cable. The specific method for collecting leakage current data of the target 10 kV cross-linked polyethylene cable is:

[0013] The target 10 kV cross-linked polyethylene cable is subjected to 10 leakage current tests. The test voltage of each leakage current test starts from 2 kV and changes stepwise to 20 kV in 2 kV steps. The leakage current data collected from the k kV test in the j-th leakage current test of the target 10 kV cross-linked polyethylene cable is recorded as , unit: mA, where j represents the jth leakage current test, and j={1, 2, …, 10}, k represents the test voltage, k={2, 4, 6, …, 20}, unit: kilovolt.

[0014] A further improvement of the technical solution is that a broadband dielectric spectrum test is performed on the target 10 kV cross-linked polyethylene cable, and a specific method for collecting the real part of dielectric loss and the imaginary part of dielectric loss of the target 10 kV cross-linked polyethylene cable at multiple frequencies is as follows:

[0015] The target 10 kV cross-linked polyethylene cable was subjected to 10 broadband dielectric spectrum tests, and the real part data of dielectric loss at multiple frequencies collected from the target 10 kV cross-linked polyethylene cable were recorded as , the imaginary part of dielectric loss is recorded as , where m represents the mth broadband dielectric spectrum test, m={1, 2, …, 10}, and n represents the frequency point at which the discrete broadband dielectric spectrum dielectric loss tangent value data are collected, n={0.001, 0.01, 0.1, 1, 10, 50, 100, 200, 500, 1000}.

[0016] A further improvement of the technical solution is that, based on the collected partial discharge data, leakage current data, real part of dielectric loss and imaginary part of dielectric loss data of the target 10 kV cross-linked polyethylene cable, a specific method for calculating the multi-dimensional degradation coefficient of the target 10 kV cross-linked polyethylene cable is as follows:

[0017] According to the collected partial discharge data and leakage current data of the target 10 kV cross-linked polyethylene cable, the cable core load factor of the target 10 kV cross-linked polyethylene cable is calculated according to the first preset formula ;

[0018] According to the collected data of the real part of dielectric loss and the imaginary part of dielectric loss of the target 10 kV cross-linked polyethylene cable at multiple frequencies, the insulation dielectric constant of the target 10 kV cross-linked polyethylene cable is calculated according to the second preset formula ;

[0019] According to the calculated target 10 kV cross-linked polyethylene cable core load factor and dielectric constant , the multi-dimensional degradation coefficient τ of the target 10 kV cross-linked polyethylene cable is calculated according to the third preset formula.

[0020] Further improvements of this technical solution include calculating the cable core load factor of the target 10 kV cross-linked polyethylene cable The first preset formula is:

[0021] ;

[0022] Where s is the cable core cross-sectional area of ​​the target 10 kV cross-linked polyethylene cable, unit: mm 2 ;

[0023] Calculate the dielectric constant of the target 10 kV cross-linked polyethylene cable The second preset formula is:

[0024] ;

[0025] The third preset formula for calculating the multi-dimensional degradation coefficient τ of the target 10 kV cross-linked polyethylene cable is:

[0026] .

[0027] A further improvement of the technical solution is that the specific method for evaluating the insulation degradation degree of the target 10 kV cross-linked polyethylene cable according to the multi-dimensional degradation coefficient τ is:

[0028] If τ≤61.82, it means that the insulation of the target 10 kV cross-linked polyethylene cable has slightly deteriorated;

[0029] If 61.82<τ≤524.37, it means that the insulation of the target 10 kV cross-linked polyethylene cable has moderately deteriorated;

[0030] If τ>524.37, it means that the insulation of the target 10 kV cross-linked polyethylene cable has been severely deteriorated.

[0031] In a third aspect, a terminal is provided, including:

[0032] processor, memory, wherein:

[0033] The memory is used to store computer programs.

[0034] The processor is used to call and run the computer program from the memory, so that the terminal executes the above-mentioned terminal method.

[0035] According to a fourth aspect, a computer storage medium is provided, wherein the computer-readable storage medium stores instructions, and when the instructions are executed on a computer, the computer executes the methods described in the above aspects.

[0036] The beneficial effects of the present invention are:

[0037] Accurate evaluation: Through the collection and analysis of multi-dimensional data, the present invention can accurately calculate the multi-dimensional degradation coefficient of the cable, thereby accurately reflecting the insulation degradation of the cable. This helps to timely discover potential faults of the cable and improve the safety and reliability of the distribution network.

[0038] Comprehensive analysis: This invention not only considers the partial discharge and leakage current data of the cable, but also introduces the real and imaginary data of dielectric loss in the broadband dielectric spectrum test. This comprehensive data analysis method can more comprehensively reflect the performance changes of the cable and improve the accuracy of the evaluation.

[0039] Early warning: Through the evaluation method of the present invention, potential problems can be discovered at the early stage of cable insulation degradation, so that maintenance or replacement can be carried out in time to avoid the expansion of faults, reduce power outage time and economic losses.

[0040] Maintenance guidance: Based on the evaluation results, a targeted cable maintenance plan can be formulated to improve maintenance efficiency and quality. At the same time, the evaluation method of the present invention can also provide valuable reference for cable selection, design and manufacturing.

[0041] In summary, the 10 kV cross-linked polyethylene cable degradation degree assessment method based on multi-dimensional degradation coefficients provided by the present invention has multiple beneficial effects such as accurate assessment, comprehensive analysis, early warning, maintenance guidance and promotion and application, which is of great significance for improving the safety, reliability and economic benefits of the distribution network.

[0042] In addition, the invention has a reliable design principle, a simple structure and a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 is a schematic flow chart of a method according to an embodiment of the present invention.

[0045] Figure 2 A schematic diagram of the structure of a terminal provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0048] Figure 1 It is a schematic flow chart of a method for evaluating the degree of degradation of a 10 kV cross-linked polyethylene cable based on multi-dimensional degradation coefficients according to an embodiment of the present invention. According to different requirements, the order of the steps in the flow chart can be changed and some can be omitted.

[0049] like Figure 1 As shown, the method includes:

[0050] Step 110, performing a partial discharge test and a leakage current test on the target 10 kV cross-linked polyethylene cable, and collecting partial discharge data and leakage current data of the target 10 kV cross-linked polyethylene cable;

[0051] Step 120, performing a broadband dielectric spectrum test on the target 10 kV cross-linked polyethylene cable, and collecting dielectric loss real part and dielectric loss imaginary part data of the target 10 kV cross-linked polyethylene cable at multiple frequencies;

[0052] Step 130, calculating the multi-dimensional degradation coefficient τ of the target 10 kV cross-linked polyethylene cable according to the collected partial discharge data, leakage current data, real part of dielectric loss and imaginary part of dielectric loss of the target 10 kV cross-linked polyethylene cable;

[0053] Step 140, evaluating the insulation degradation degree of the target 10 kV cross-linked polyethylene cable according to the multi-dimensional degradation coefficient τ.

[0054] In combination with the process of evaluating the degradation degree of a 10 kV cross-linked polyethylene cable based on a multi-dimensional degradation coefficient in the embodiment, the method for evaluating the degradation degree of a 10 kV cross-linked polyethylene cable based on a multi-dimensional degradation coefficient provided by the present invention is further described.

[0055] Among them, the specific method of conducting partial discharge test on the target 10 kV cross-linked polyethylene cable and collecting partial discharge data of the target 10 kV cross-linked polyethylene cable is as follows:

[0056] The target 10 kV cross-linked polyethylene cable was subjected to 10 partial discharge tests. The test voltage started from 2 kV and changed stepwise to 20 kV in 2 kV steps. ={2, 4, 6, …, 20}, unit: kV, where i represents the i-th partial discharge test, and i={1, 2, …, 10}, the partial discharge data collected from the target 10 kV cross-linked polyethylene cable is recorded as , unit: C coulomb, abbreviated as coulomb, symbol C.

[0057] The process of partial discharge test on the target 10 kV cross-linked polyethylene cable is as follows: select a high-precision partial discharge detector to ensure that the instrument is accurately calibrated and has sufficient sensitivity to capture weak discharge signals, select the target 10 kV cross-linked polyethylene cable segment to be tested in an unpowered state, and perform necessary cleaning to eliminate external interference, build a shielded room or test environment that meets the test requirements in the laboratory or on-site, and control environmental factors such as temperature and humidity to ensure the accuracy of the test results. After that, connect the test equipment: connect the partial discharge detector to the corresponding test point of the cable to ensure that the connection is firm and the contact is good; set the test parameters: set the test voltage, frequency and other parameters of the partial discharge detector according to the rated voltage, insulation thickness and other parameters of the cable; apply the test voltage: gradually increase the test voltage until it reaches the rated voltage of the cable or the predetermined test voltage value; monitor the discharge signal: during the test, the partial discharge detector monitors the discharge signal of the cable in real time, and records the amplitude, phase and other parameters of the discharge pulse; data analysis: process and analyze the collected discharge data, and calculate the relevant indicators of the partial discharge amount, such as the number of discharges and the discharge energy.

[0058] Furthermore, a leakage current test is performed on the target 10 kV cross-linked polyethylene cable. The specific method for collecting leakage current data of the target 10 kV cross-linked polyethylene cable is as follows:

[0059] The target 10 kV cross-linked polyethylene cable is subjected to 10 leakage current tests. The test voltage of each leakage current test starts from 2 kV and changes stepwise to 20 kV in 2 kV steps. The leakage current data collected from the k kV test in the j-th leakage current test of the target 10 kV cross-linked polyethylene cable is recorded as , unit: mA, where j represents the jth leakage current test, and j={1, 2, …, 10}, k represents the test voltage, k={2, 4, 6, …, 20}, unit: kilovolt.

[0060] The process of conducting leakage current test on the target 10 kV cross-linked polyethylene cable is as follows: select a high-precision leakage current tester to ensure that the instrument is accurately calibrated and has a sufficient measurement range to cover the leakage current value of the cable; select the target 10 kV cross-linked polyethylene cable segment to be tested in an unpowered state and perform necessary cleaning; build a test environment that meets the test requirements in the laboratory or on-site, and control environmental factors such as temperature and humidity to reduce the impact on the leakage current. After that, connect the test equipment: connect the leakage current tester to the ground terminal of the cable to ensure that the connection is firm and the contact is good; apply the test voltage: according to the rated voltage of the cable and the test requirements, gradually increase the test voltage until the predetermined test voltage value is reached; monitor the leakage current: during the test, the leakage current value of the cable is monitored in real time through the leakage current tester, and the relevant data is recorded; data analysis: process and analyze the collected leakage current data, and calculate the relevant indicators of the leakage current, such as the leakage current value, the trend of leakage current changing with voltage, etc.

[0061] Furthermore, a broadband dielectric spectrum test is performed on the target 10 kV cross-linked polyethylene cable. The specific method for collecting the real part of dielectric loss and the imaginary part of dielectric loss data of the target 10 kV cross-linked polyethylene cable at multiple frequencies is as follows:

[0062] The target 10 kV cross-linked polyethylene cable was subjected to 10 broadband dielectric spectrum tests, and the real part data of dielectric loss at multiple frequencies collected from the target 10 kV cross-linked polyethylene cable were recorded as , the imaginary part of dielectric loss is recorded as , where m represents the mth broadband dielectric spectrum test, m={1, 2, …, 10}, and n represents the frequency point at which the discrete broadband dielectric spectrum dielectric loss tangent value data are collected, n={0.001, 0.01, 0.1, 1, 10, 50, 100, 200, 500, 1000}.

[0063] Furthermore, based on the collected partial discharge data, leakage current data, real part of dielectric loss and imaginary part of dielectric loss data of the target 10 kV cross-linked polyethylene cable, the specific method for calculating the multi-dimensional degradation coefficient of the target 10 kV cross-linked polyethylene cable is as follows:

[0064] According to the collected partial discharge data and leakage current data of the target 10 kV cross-linked polyethylene cable, the cable core load factor of the target 10 kV cross-linked polyethylene cable is calculated according to the first preset formula ; The first preset formula is:

[0065] ;

[0066] Where s is the cable core cross-sectional area of ​​the target 10 kV cross-linked polyethylene cable, unit: mm 2 .

[0067] According to the collected data of the real part of dielectric loss and the imaginary part of dielectric loss of the target 10 kV cross-linked polyethylene cable at multiple frequencies, the insulation dielectric constant of the target 10 kV cross-linked polyethylene cable is calculated according to the second preset formula ; The second preset formula is:

[0068] .

[0069] According to the calculated target 10 kV cross-linked polyethylene cable core load factor and dielectric constant , the multi-dimensional degradation coefficient τ of the target 10 kV cross-linked polyethylene cable is calculated according to the third preset formula, and the third preset formula is:

[0070] .

[0071] Furthermore, the specific method for evaluating the insulation degradation degree of the target 10 kV cross-linked polyethylene cable according to the multi-dimensional degradation coefficient τ is as follows:

[0072] If τ≤61.82, it means that the insulation of the target 10 kV cross-linked polyethylene cable has slightly deteriorated;

[0073] If 61.82<τ≤524.37, it means that the insulation of the target 10 kV cross-linked polyethylene cable has moderately deteriorated;

[0074] If τ>524.37, it means that the insulation of the target 10 kV cross-linked polyethylene cable has been severely deteriorated.

[0075] Figure 2A schematic diagram of the structure of a terminal 200 provided in an embodiment of the present invention, wherein the terminal 200 can be used to execute the automatic calculation or analysis process in the 10 kV cross-linked polyethylene cable degradation degree assessment method based on multi-dimensional degradation coefficients provided in an embodiment of the present invention.

[0076] The terminal 200 may include: a processor 210, a memory 220 and a communication module 230. These components communicate via one or more buses. Those skilled in the art will appreciate that the server structure shown in the figure does not limit the present invention, and it may be a bus structure or a star structure, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0077] The memory 220 can be used to store the execution instructions of the processor 210, and the memory 220 can be implemented by any type of volatile or non-volatile storage terminal or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. When the execution instructions in the memory 220 are executed by the processor 210, the terminal 200 can perform some or all of the steps in the following method embodiments.

[0078] The processor 210 is the control center of the storage terminal, and uses various interfaces and lines to connect various parts of the entire electronic terminal. It runs or executes software programs and / or modules stored in the memory 220, and calls data stored in the memory to perform various functions of the electronic terminal and / or process data. The processor can be composed of an integrated circuit (IC), for example, it can be composed of a single packaged IC, or it can be composed of multiple packaged ICs with the same or different functions. For example, the processor 210 can only include a central processing unit (CPU). In the embodiment of the present invention, the CPU can be a single computing core or multiple computing cores.

[0079] The communication module 230 is used to establish a communication channel so that the storage terminal can communicate with other terminals, receive user data sent by other terminals or send user data to other terminals.

[0080] The present invention also provides a computer storage medium, wherein the computer storage medium may store a program, and when the program is executed, the program may include some or all of the steps in each embodiment provided by the present invention. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0081] Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solution in the embodiments of the present invention, in essence or in other words, the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes, including several instructions for enabling a computer terminal (which can be a personal computer, a server, or a second terminal, a network terminal, etc.) to execute all or part of the steps of the methods described in each embodiment of the present invention.

[0082] In this specification, the same or similar parts between the various embodiments can be referred to each other. In particular, for the terminal embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiment.

[0083] Although the present invention has been described in detail with reference to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A method for evaluating the degradation degree of a 10 kV cross-linked polyethylene cable based on a multi-dimensional degradation coefficient, characterized in that: include: Conduct partial discharge test and leakage current test on the target 10 kV cross-linked polyethylene cable, and collect partial discharge data and leakage current data of the target 10 kV cross-linked polyethylene cable; Conduct broadband dielectric spectrum test on the target 10 kV cross-linked polyethylene cable, and collect the real part and imaginary part data of dielectric loss of the target 10 kV cross-linked polyethylene cable at multiple frequencies; According to the collected partial discharge data, leakage current data, real part of dielectric loss and imaginary part of dielectric loss data of the target 10 kV cross-linked polyethylene cable, the multi-dimensional degradation coefficient τ of the target 10 kV cross-linked polyethylene cable is calculated; The insulation degradation degree of the target 10 kV cross-linked polyethylene cable was evaluated based on the multi-dimensional degradation coefficient τ; Among them, the specific method of conducting partial discharge test on the target 10 kV cross-linked polyethylene cable and collecting partial discharge data of the target 10 kV cross-linked polyethylene cable is as follows: The target 10 kV cross-linked polyethylene cable was subjected to 10 partial discharge tests. The test voltage started from 2 kV and changed stepwise to 20 kV in 2 kV steps. ={2, 4, 6, …, 20}, unit: kV, where i represents the i-th partial discharge test, and i={1, 2, …, 10}, the partial discharge data collected from the target 10 kV cross-linked polyethylene cable is recorded as , unit: coulomb; The leakage current test of the target 10 kV cross-linked polyethylene cable is carried out. The specific method for collecting the leakage current data of the target 10 kV cross-linked polyethylene cable is as follows: The target 10 kV cross-linked polyethylene cable is subjected to 10 leakage current tests. The test voltage of each leakage current test starts from 2 kV and changes stepwise to 20 kV in 2 kV steps. The leakage current data collected from the k kV test in the j-th leakage current test of the target 10 kV cross-linked polyethylene cable is recorded as , unit: mA, where j represents the jth leakage current test, and j={1, 2, ..., 10}, k represents the test voltage, k={2, 4, 6, ..., 20}, unit: kilovolt; The specific method of conducting broadband dielectric spectrum test on the target 10 kV cross-linked polyethylene cable and collecting the real part and imaginary part data of dielectric loss of the target 10 kV cross-linked polyethylene cable at multiple frequencies is as follows: The target 10 kV cross-linked polyethylene cable was subjected to 10 broadband dielectric spectrum tests, and the real part data of dielectric loss at multiple frequencies collected from the target 10 kV cross-linked polyethylene cable were recorded as , the imaginary part of dielectric loss is recorded as , where m represents the mth broadband dielectric spectrum test, m={1, 2, …, 10}, n represents the frequency point at which the discrete broadband dielectric spectrum dielectric loss tangent value data are collected, n={0.001, 0.01, 0.1, 1, 10, 50, 100, 200, 500, 1000}; According to the collected partial discharge data, leakage current data, real part of dielectric loss and imaginary part of dielectric loss data of the target 10 kV cross-linked polyethylene cable, the specific method for calculating the multi-dimensional degradation coefficient of the target 10 kV cross-linked polyethylene cable is as follows: According to the collected partial discharge data and leakage current data of the target 10 kV cross-linked polyethylene cable, the cable core load factor of the target 10 kV cross-linked polyethylene cable is calculated according to the first preset formula ; According to the collected data of the real part of dielectric loss and the imaginary part of dielectric loss of the target 10 kV cross-linked polyethylene cable at multiple frequencies, the insulation dielectric constant of the target 10 kV cross-linked polyethylene cable is calculated according to the second preset formula ; According to the calculated target 10 kV cross-linked polyethylene cable core load factor and dielectric constant , calculate the multi-dimensional degradation coefficient τ of the target 10 kV cross-linked polyethylene cable according to the third preset formula; Calculation of the core load factor of the target 10 kV cross-linked polyethylene cable The first preset formula is: ； Where s is the cable core cross-sectional area of ​​the target 10 kV cross-linked polyethylene cable, unit: mm 2 ; Calculate the dielectric constant of the target 10 kV cross-linked polyethylene cable The second preset formula is: ； The third preset formula for calculating the multi-dimensional degradation coefficient τ of the target 10 kV cross-linked polyethylene cable is: 。 2. The method for evaluating the degradation degree of a 10 kV cross-linked polyethylene cable based on a multi-dimensional degradation coefficient according to claim 1 is characterized in that: The specific method for evaluating the insulation degradation degree of the target 10 kV cross-linked polyethylene cable according to the multi-dimensional degradation coefficient τ is as follows: If τ≤61.82, it means that the insulation of the target 10 kV cross-linked polyethylene cable has slightly deteriorated; If 61.82<τ≤524.37, it means that the insulation of the target 10 kV cross-linked polyethylene cable has moderately deteriorated; If τ>524.37, it means that the insulation of the target 10 kV cross-linked polyethylene cable has been severely deteriorated.

3. A terminal, characterized in that: include: processor; A memory for storing execution instructions of the processor; The processor is configured to execute the method according to any one of claims 1 to 2.

4. A computer-readable storage medium storing a computer program, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 2 is implemented.

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