Cable insulation state evaluation method based on multi-source current characteristic parameters and evaluation device thereof

Abstract

The invention discloses a cable insulation state evaluation method based on multi-source current characteristic parameters and an evaluation device thereof, and belongs to the field of online monitoring and fault diagnosis of power equipment. The method comprises the following steps: collecting double-transformer current, wherein the double-transformer current comprises cable main current and grounding current; multi-source current characteristic parameters are extracted, the extraction of the characteristic parameters comprises current phase analysis, grounding current harmonic analysis and grounding current amplitude analysis, and then the multi-source current characteristic parameters are obtained; calculating the deviation degree according to the obtained multi-source current characteristic parameters; and taking the deviation degree as an evaluation basis of cable aging online evaluation, obtaining an evaluation result, and performing aging state early warning according to the evaluation. The real operation state can be better reflected, the calculation amount of the calculation method is small, and the real-time performance is good; and the evaluation result is more scientific and accurate.

Description

Technical Field

[0001] The present invention belongs to the field of online monitoring and fault diagnosis of electric power equipment, and in particular relates to a cable insulation state evaluation method based on multi-source current characteristic parameters and an evaluation device thereof. Background Art

[0002] Restricted by factors such as line corridors and electromagnetic environment, and in response to the requirements of power supply reliability and urban beautification, cable line construction has been accelerated. Cross-linked cables have been widely used due to their advantages of simple structure, light weight, good heat resistance, and strong load capacity. Compared with traditional overhead lines, the installation and operation of cross-linked cables are simpler and more reliable.

[0003] As the scale of cities gradually expands, the load density of distribution networks continues to increase, and the requirements for their power supply reliability are becoming higher and higher. Advanced Internet of Things, modern sensing and information communication technologies are adopted to achieve online monitoring of equipment, improve early warning capabilities and information levels; improve fault location capabilities, achieve real-time observable and controllable distribution networks, and change "passive repair reporting" to "active monitoring".

[0004] As the most critical component of the distribution network, power cables will have their insulation performance greatly reduced after long-term operation due to the erosion of water or reaction with certain components in the soil. These factors are all factors that cause cable insulation breakdown accidents. The environment in which the cables are located is relatively complex, which makes it extremely difficult to troubleshoot faults. Analysis of power grid accidents reported worldwide in the past few years shows that cable failures are frequent and have serious consequences.

[0005] Cable detection helps to track and understand the operating status of the cable, identify and solve potential faults as early as possible, and ensure the long-term stable operation of the cable. In the past, preventive test methods were used, which are offline detection methods and can only be performed after a power outage. It has disadvantages such as long maintenance time and high consumption costs, and cannot adapt to current electricity demand. Therefore, in recent years, online detection technology for power cables has received greater attention. The principle of this technology is to collect the characteristic quantities of cable insulation performance, analyze and study them based on them, in order to understand the real-time insulation performance level of the cable. It is an advanced and fast online detection technology. Its application marks the transition of cable safety from preventive detection to predictive detection, thereby more effectively reducing the incidence of cable safety accidents, which is an important guarantee for the stable operation of cables.

[0006] Therefore, it is urgent to provide a reliable method for evaluating the cable insulation status and to provide early warning of aging failures. Summary of the invention

[0007] The purpose of the present invention is to provide a cable insulation status evaluation method and an evaluation device based on multi-source current characteristic parameters in response to the problems raised by the above-mentioned background technology, extract current information including the main current of the cable and the grounding current, calculate the multi-source current data deviation through the collected current information, and then use the multi-source current data deviation as the basis for judging the online monitoring of cable aging. The present invention provides a decision-making basis for the aging of the cable insulation medium, and promptly issues an early warning after identifying an obvious abnormal aging fault to avoid the occurrence of severe accidents.

[0008] In order to achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0009] The present invention provides a cable insulation state evaluation method based on multi-source current characteristic parameters, comprising:

[0010] Collect dual transformer currents, which include the main cable current and the grounding current;

[0011] Extracting multi-source current characteristic parameters, wherein the extraction of the characteristic parameters includes current phase analysis, ground current harmonic analysis and ground current amplitude analysis, thereby obtaining multi-source current characteristic parameters;

[0012] Calculate the deviation according to the obtained multi-source current characteristic parameters;

[0013] The deviation is used as an evaluation basis for online evaluation of cable aging, and an evaluation result is obtained, and an aging status early warning is issued based on the evaluation.

[0014] Furthermore, the main current of the cable is the main current of a phase of the cable to be evaluated collected by a current transformer.

[0015] Furthermore, the grounding current is the copper shielding grounding current of the corresponding phase of the cable to be evaluated collected by a current transformer.

[0016] Furthermore, the current phase analysis process includes: obtaining the main current phase angle and the ground current phase angle at the same time by using the fast Fourier transform FFT function and the angle function (phase angle function); and then obtaining the phase difference between the main current and the ground current, and using the phase difference as the first current characteristic point;

[0017] The process of the ground current harmonic analysis includes: taking the 1st to 5th harmonic contents and the total harmonic content of the ground current as the second current characteristic point to the seventh current characteristic point;

[0018] The process of analyzing the ground current amplitude includes: taking the average value of the amplitude of the ground current in a single monitoring time period as the ground current amplitude, and taking the ground current amplitude as the eighth current characteristic point.

[0019] Furthermore, the calculation of the deviation is performed by the matrix X obtained from the i-th monitoring data. i Calculated with the initial matrix X1;

[0020] The specific calculation method is as follows:

[0021] Let, the phase difference between the main current and the grounding current of the initial commissioning cable be θ; the first to fifth harmonic contents of the grounding current are H1, H2, H3, H4, H5 respectively; the total harmonic content is THD; the amplitude of the grounding current is I;

[0022] Take θ, H1, H2, H3, H4, H5, THD, and I as 8 groups of benchmark data points to form the initial matrix X1:

[0023] X1=[θH1 H2 H3 H4 H5 THD I]

[0024] The matrix obtained from the i-th monitoring data is X i :

[0025] X i =[θ i H 1i H 2i H 3i H 4i H 5i THD i I i ]

[0026] Then the multi-source data deviation matrix is ​​Y i :

[0027] Y i =X i / X1=[y 1i y 2i y 3i y 4i y 5i y 6i y 7i y 8i ]

[0028] The deviation of cable current multi-source data is Pi:

[0029] P i =(y 1i +y 2i +y 3i +y 4i +y 5i +y 6i +y 7i +y 8i ) / 8.

[0030] Furthermore, an aging status warning is performed based on the deviation result. The specific method is to compare the deviation with a set warning threshold. When the deviation is greater than the warning threshold, a warning message is issued.

[0031] Furthermore, in actual use, the actual deviation of the aging cable on site can be used as a warning threshold.

[0032] Furthermore, the optimal value of the warning threshold is 1.4.

[0033] The present invention provides a cable insulation state evaluation device based on multi-source current characteristic parameters, the device comprising:

[0034] Dual transformer current acquisition module, used to collect cable main current and ground current;

[0035] A multi-source current characteristic parameter extraction module is used to extract multi-source current characteristic parameters;

[0036] A deviation calculation module, used for calculating the deviation according to the multi-source current characteristic parameters provided by the multi-source current characteristic parameter extraction module;

[0037] The cable aging status warning module is used to perform online evaluation of cable aging based on the deviation, thereby providing aging status warning.

[0038] Furthermore, the dual-transformer current acquisition module acquires the main current of a phase of the cable to be evaluated and the copper shield grounding current of the corresponding phase of the cable to be evaluated through the current transformer.

[0039] Furthermore, the multi-source current characteristic parameter extraction module includes a current phase analysis submodule, a ground current harmonic analysis submodule and a ground current amplitude analysis submodule.

[0040] The present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the above-mentioned cable insulation state evaluation based on multi-source current characteristic parameters when executing the computer program.

[0041] The present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the cable insulation state evaluation method based on multi-source current characteristic parameters is implemented.

[0042] Compared with the prior art, the beneficial effects of the present invention are:

[0043] The present invention evaluates the cable insulation status by extracting multi-source current characteristic parameters (including current information of the cable main current and the grounding current), which can better reflect the actual operating status and make the evaluation result more scientific and accurate.

[0044] The present invention calculates the deviation of multi-source current data through the collected multi-source current characteristic parameters. The calculation method has small calculation amount and good real-time performance. Therefore, the deviation of multi-source current data is used as the evaluation basis for online monitoring of cable aging, which can more accurately and effectively identify obvious abnormal aging faults and give early warning in time to avoid the occurrence of severe accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described below in conjunction with the accompanying drawings. The accompanying drawings are only used to illustrate preferred embodiments and are not to be considered as limiting the present application.

[0046] Figure 1 It is a schematic diagram of the process of the cable insulation status evaluation method of the present invention;

[0047] Figure 2 A schematic diagram of dual mutual inductor current wiring for the cable insulation status assessment method of the present invention;

[0048] Figure 3 A set of ground current test waveform diagrams in the embodiment;

[0049] Figure 4 It is a schematic diagram of harmonic analysis results in the embodiment;

[0050] Figure 5 It is a comparison distribution diagram of the deviation between defective and non-defective samples;

[0051] Figure 6 It is a structural principle diagram of the cable insulation status evaluation device of the present invention;

[0052] Figure 7 Schematic diagram of the structure of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0053] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the term "including" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0055] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0056] Embodiment 1:

[0057] like Figure 1 As shown, a cable insulation status evaluation method based on multi-source current characteristic parameters includes:

[0058] Collect dual transformer currents, which include the main cable current and the grounding current;

[0059] Extracting multi-source current characteristic parameters, wherein the extraction of the characteristic parameters includes current phase analysis, ground current harmonic analysis and ground current amplitude analysis, thereby obtaining multi-source current characteristic parameters;

[0060] Calculate the deviation according to the obtained multi-source current characteristic parameters;

[0061] The deviation is used as an evaluation basis for online evaluation of cable aging, and an evaluation result is obtained, and an aging status early warning is issued based on the evaluation.

[0062] See attached Figure 2 The main current of the cable is the main current of a phase of the cable to be evaluated collected by the current transformer T1; preferably, the specification of the current transformer T1 is selected to have a resolution of 0.1A and a range of 0-1500A.

[0063] The grounding current is the copper shield grounding current of the corresponding phase of the cable to be evaluated collected by the current transformer T2; preferably, the specification of the current transformer T2 is selected to have a resolution of 1mA and a range of 0-4A.

[0064] Embodiment 2:

[0065] The process of current phase analysis includes: obtaining the main current phase angle θ1 and the ground current phase angle θ2 at the same time through the fast Fourier transform FFT function and the angle function (phase angle function); then obtaining the phase difference θ between the main current and the ground current, and taking the phase difference θ as the first current characteristic point.

[0066] The process of grounding current harmonic analysis includes: using cwt function (continuous Fourier transform) to analyze the harmonic content of the grounding current signal to obtain the harmonic content at different harmonic frequencies; taking the 1st to 5th harmonic contents H1, H2, H3, H4, H5 of the grounding current, and the total harmonic content THD as the second current characteristic point to the seventh current characteristic point.

[0067] The process of analyzing the ground current amplitude includes: taking the average value of the amplitude of the ground current in a single monitoring time period as the ground current amplitude I, and taking the ground current amplitude I as the eighth current characteristic point.

[0068] Figure 3 FIG. 1 is a set of ground current signal test waveforms in the current phase analysis of this embodiment. Figure 4 This is a diagram of the ground current harmonic analysis results of this embodiment.

[0069] Embodiment three:

[0070] The calculation of the deviation is based on the matrix X obtained from the i-th monitoring data. i Calculated with the initial matrix X1;

[0071] The specific calculation method is as follows:

[0072] Let, take the phase difference θ between the main current and the ground current of the initial commissioned cable, the first to fifth harmonic content H1~H5 of the ground current, the total harmonic content THD and the ground current amplitude I as 8 groups of reference data points to form the initial matrix X1:

[0073] X1=[θH1 H2 H3 H4 H5 THD I]

[0074] The matrix obtained from the i-th monitoring data is X i :

[0075] X i =[θ i H 1i H 2i H 3i H 4i H 5i THD i I i ]

[0076] Then the multi-source data deviation matrix is ​​Y i :

[0077] Y i =X i / X1=[y 1i y 2i y 3i y 4i y 5i y 6i y 7i y 8i ]

[0078] The deviation of cable current multi-source data is Pi:

[0079] P i =(y1i +y 2i +y 3i +y 4i +y 5i +y 6i +y 7i +y 8i ) / 8.

[0080] Embodiment 4:

[0081] An aging status warning is issued based on the deviation results. The specific method is to compare the deviation with the set warning threshold. When the deviation is greater than the warning threshold, a warning message is issued.

[0082] This example verifies the reliability of the method through experimental data. Figure 5 As shown in the figure, the deviation of samples with insulation defects is relatively large. According to the test results, the deviation of 1.4 is used as the optimal warning value for insulation degradation. In field operation, the warning threshold can be adjusted according to the operating experience data.

[0083] Embodiment five:

[0084] The present invention provides a cable insulation state evaluation device based on multi-source current characteristic parameters, referring to Figure 6 , the device comprises:

[0085] Dual transformer current acquisition module, used to collect cable main current and ground current;

[0086] A multi-source current characteristic parameter extraction module is used to extract multi-source current characteristic parameters;

[0087] A deviation calculation module, used for calculating the deviation according to the multi-source current characteristic parameters provided by the multi-source current characteristic parameter extraction module;

[0088] The cable aging status warning module is used to perform online evaluation of cable aging based on the deviation, thereby providing aging status warning.

[0089] Further, the multi-source current characteristic parameter extraction module includes a current phase analysis submodule, a ground current harmonic analysis submodule and a ground current amplitude analysis submodule;

[0090] The current phase analysis submodule obtains the main current phase angle and the ground current phase angle at the same time through the fast Fourier transform FFT function and the angle function (phase angle function); then obtains the phase difference between the main current and the ground current, and uses the phase difference as the first current characteristic point;

[0091] The ground current harmonic analysis submodule uses the 1st to 5th harmonic contents and the total harmonic content of the ground current as the second current characteristic point to the seventh current characteristic point;

[0092] The ground current amplitude analysis submodule uses the average amplitude value of the ground current in a single monitoring time period as the ground current amplitude, and uses the ground current amplitude as the eighth current characteristic point.

[0093] Furthermore, the deviation calculation module obtains the matrix X obtained by the i-th monitoring data i Calculate the deviation from the initial matrix X1;

[0094] The specific calculation method is as follows:

[0095] Let, the phase difference between the main current and the grounding current of the initial commissioning cable be θ; the first to fifth harmonic contents of the grounding current are H1, H2, H3, H4, H5 respectively; the total harmonic content is THD; the amplitude of the grounding current is I;

[0096] Take θ, H1, H2, H3, H4, H5, THD, and I as 8 groups of benchmark data points to form the initial matrix X1:

[0097] X1=[θH1 H2 H3 H4 H5 THD I]

[0098] The matrix obtained from the i-th monitoring data is X i :

[0099] X i =[θ i H 1i H 2i H 3i H 4i H 5i THD i I i ]

[0100] Then the multi-source data deviation matrix is ​​Y i :

[0101] Y i =X i / X1=[y 1i y 2i y 3i y 4i y 5i y 6i y 7i y 8i ]

[0102] The deviation of cable current multi-source data is Pi:

[0103] P i =(y 1i +y 2i +y 3i +y4i +y 5i +y 6i +y 7i +y 8i ) / 8.

[0104] Furthermore, the cable aging status warning module issues an aging status warning based on the deviation result of the deviation calculation module, compares the deviation with a set warning threshold, and issues a warning message when the deviation is greater than the warning threshold.

[0105] Embodiment six:

[0106] The present invention also provides a computer device, including a memory and a processor, such as Figure 7 As shown, the memory stores a computer program, and when the processor executes the computer program, it implements the above-mentioned cable insulation state evaluation method embodiment based on multi-source current characteristic parameters or the technical solution in the above-mentioned cable insulation state evaluation method embodiment based on multi-source current characteristic parameters, and its implementation principle and technical effect are similar, which will not be repeated here.

[0107] Embodiment seven:

[0108] According to an embodiment of the present invention, a computer-readable storage medium corresponding to a cable insulation status evaluation method based on multi-source current characteristic parameters is also provided, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the cable insulation status evaluation method based on multi-source current characteristic parameters described above.

[0109] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A cable insulation status evaluation method based on multi-source current characteristic parameters, characterized in that: Methods include: Collect dual transformer currents, which include the main cable current and the grounding current; Extracting multi-source current characteristic parameters, wherein the extraction of the characteristic parameters includes current phase analysis, ground current harmonic analysis and ground current amplitude analysis, thereby obtaining multi-source current characteristic parameters; Calculate the deviation according to the obtained multi-source current characteristic parameters; The deviation is used as an evaluation basis for online evaluation of cable aging, and an evaluation result is obtained, and an aging status early warning is issued based on the evaluation.

2. The cable insulation status evaluation method based on multi-source current characteristic parameters according to claim 1 is characterized in that: The cable main current is the main current of a certain phase of the cable to be evaluated collected by a current transformer; the grounding current is the copper shield grounding current of the corresponding phase of the cable to be evaluated collected by a current transformer.

3. The cable insulation status evaluation method based on multi-source current characteristic parameters according to claim 1 or 2, characterized in that: The current phase analysis process includes: obtaining the main current phase angle and the ground current phase angle at the same time by using the fast Fourier transform FFT function and the angle function; then obtaining the phase difference between the main current and the ground current, and using the phase difference as the first current characteristic point; The process of the ground current harmonic analysis includes: taking the 1st to 5th harmonic contents and the total harmonic content of the ground current as the second current characteristic point to the seventh current characteristic point; The process of analyzing the ground current amplitude includes: taking the average value of the amplitude of the ground current in a single monitoring time period as the ground current amplitude, and taking the ground current amplitude as the eighth current characteristic point.

4. The cable insulation status evaluation method based on multi-source current characteristic parameters according to claim 3 is characterized in that: The calculation of the deviation is done by using the matrix X obtained from the i-th monitoring data. i Calculated with the initial matrix X1; The specific calculation method is as follows: Let, the phase difference between the main current and the grounding current of the initial commissioning cable be θ; the first to fifth harmonic contents of the grounding current are H1, H2, H3, H4, H5 respectively; the total harmonic content is THD; the amplitude of the grounding current is I; Take θ, H1, H2, H3, H4, H5, THD, and I as 8 groups of benchmark data points to form the initial matrix X1: X1=[θH1 H2 H3 H4 H5 THD I] The matrix obtained from the i-th monitoring data is X i : X i =[θ i H 1i H 2i H 3i H 4i H 5i THD i I i ] Then the multi-source data deviation matrix is ​​Y i : AND i =X i / X1=[y 1i and 2i and 3i and 4i and 5i and 6i and 7i and 8i ] The deviation of cable current multi-source data is Pi: P i (and 1i +y 2i +y 3i +y 4i +y 5i +y 6i +y 7i +y 8i ) / 8。 5. The cable insulation status evaluation method based on multi-source current characteristic parameters according to claim 4 is characterized in that: An aging status warning is issued based on the deviation results. The specific method is to compare the deviation with the set warning threshold. When the deviation is greater than the warning threshold, a warning message is issued.

6. The cable insulation status evaluation method based on multi-source current characteristic parameters according to claim 5 is characterized in that: In actual use, the actual deviation of the aging cable on site is used as the warning threshold.

7. The cable insulation status evaluation method based on multi-source current characteristic parameters according to claim 5 or 6, characterized in that: The warning threshold is 1.

4.

8. A cable insulation status evaluation device based on multi-source current characteristic parameters, characterized in that: The device includes: Dual transformer current acquisition module, used to collect cable main current and ground current; A multi-source current characteristic parameter extraction module is used to extract multi-source current characteristic parameters; A deviation calculation module, used for calculating the deviation according to the multi-source current characteristic parameters provided by the multi-source current characteristic parameter extraction module; The cable aging status early warning module is used to perform online evaluation of cable aging based on the deviation, thereby providing an early warning of the aging status.

9. The cable insulation status evaluation device based on multi-source current characteristic parameters according to claim 8, characterized in that: The dual-transformer current acquisition module acquires the main current of a phase of the cable to be evaluated and the copper shield grounding current of the corresponding phase of the cable to be evaluated through a current transformer.

10. The cable insulation status evaluation device based on multi-source current characteristic parameters according to claim 8, characterized in that: The multi-source current characteristic parameter extraction module includes a current phase analysis submodule, a ground current harmonic analysis submodule and a ground current amplitude analysis submodule; The current phase analysis submodule obtains the main current phase angle and the ground current phase angle at the same time through the fast Fourier transform FFT function and the angle function (phase angle function); then obtains the phase difference between the main current and the ground current, and uses the phase difference as the first current characteristic point; The ground current harmonic analysis submodule uses the 1st to 5th harmonic contents and the total harmonic content of the ground current as the second current characteristic point to the seventh current characteristic point; The ground current amplitude analysis submodule uses the average amplitude value of the ground current in a single monitoring time period as the ground current amplitude, and uses the ground current amplitude as the eighth current characteristic point.

11. The cable insulation status evaluation device based on multi-source current characteristic parameters according to claim 10, characterized in that: The deviation calculation module obtains the matrix X obtained by the i-th monitoring data i Calculate the deviation from the initial matrix X1; The specific calculation method is as follows: Let, the phase difference between the main current and the grounding current of the initial commissioning cable be θ; the first to fifth harmonic contents of the grounding current are H1, H2, H3, H4, H5 respectively; the total harmonic content is THD; the amplitude of the grounding current is I; Take θ, H1, H2, H3, H4, H5, THD, and I as 8 groups of benchmark data points to form the initial matrix X1: X1=[θH1 H2 H3 H4 H5 THD I] The matrix obtained from the i-th monitoring data is X i : X i =[θ i H 1i H 2i H 3i H 4i H 5i THD i I i ] Then the multi-source data deviation matrix is ​​Y i : AND i =X i / X1=[y 1i and 2i and 3i and 4i and 5i and 6i and 7i and 8i ] The deviation of cable current multi-source data is Pi: P i (and 1i +y 2i +y 3i +y 4i +y 5i +y 6i +y 7i +y 8i ) / 8。 12. The cable insulation status evaluation device based on multi-source current characteristic parameters according to claim 11, characterized in that: The cable aging status warning module issues an aging status warning based on the deviation result of the deviation calculation module, compares the deviation with the set warning threshold, and issues a warning message when the deviation is greater than the warning threshold.

13. A computer device, characterized in that: It comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that the memory stores the computer program, and when the processor executes the computer program, the cable insulation state evaluation method based on multi-source current characteristic parameters as described in any one of claims 1 to 7 is implemented.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: The storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the cable insulation state evaluation method based on multi-source current characteristic parameters as described in any one of claims 1 to 7.

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