High-voltage cable outer sheath fault electrified intelligent diagnosis system and method

Abstract

The invention provides a high-voltage cable outer sheath fault electrified intelligent diagnosis system and method, which can be used in the technical field of electric power. The system comprises at least two current detection devices, each current detection device sleeves a to-be-detected high-voltage cable, and the position of at least one current detection device in the at least two current detection devices is fixed during current detection. Other current detection devices move along the length direction of the to-be-detected high-voltage cable during current detection; and the data analysis device is connected with the current detection device and is used for carrying out fault diagnosis on the high-voltage cable to be detected according to the current detected by the current detection device. According to the electrified intelligent diagnosis system and method for the fault of the outer sheath of the high-voltage cable, the grounding current of the outer sheath of the operating high-voltage cable is detected, the grounding point of the outer sheath is accurately positioned through electrified detection, the troubleshooting effect on multi-point grounding defects of the outer sheath of a single-phase cable is good, and the fault processing time is greatly shortened.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a live intelligent diagnosis system and method for high-voltage cable outer sheath faults. Background Art

[0002] In recent years, high-voltage cables have been widely used in urban power transmission and distribution networks, and the power grid has increasingly higher requirements for the reliability of high-voltage cable equipment. The components of high-voltage cables from the inside to the outside include: conductor, semi-conductive layer, main insulation, inner sheath, armor, and outer sheath. In the daily operation and maintenance of the cable, the outer sheath of the cable may be grounded due to improper installation and construction, local moisture, etc., which may reduce the insulation of the outer sheath. The fault grounding point often forms a grounding loop with the direct grounding point of the cable outer sheath or other fault grounding points through the earth. The loop size can reach tens or even hundreds of amperes. Long-term operation will seriously affect the main insulation performance of the cable and greatly reduce the working life of the cable. When the heat is severe, it may even burn the cable grounding wire and cause a vicious power grid accident. Therefore, in order to avoid the grounding loop problem of the high-voltage cable caused by the grounding fault of the outer sheath of the cable, it is necessary to carry out intelligent diagnosis of the outer sheath of the high-voltage cable under the energized operating conditions, timely detect the grounding fault of the outer sheath and take protective measures to ensure the safe and stable operation of the high-voltage cable.

[0003] At present, in the daily operation and maintenance of cables, the current value of the shielding layer grounding lead wire at the cable terminal is often measured by a clamp-on ammeter, and the three-phase measurement values ​​are compared to analyze whether there is a grounding fault in the outer sheath of the high-voltage cable. However, this method can only roughly identify whether there is a grounding fault in the outer sheath, and cannot locate the fault point, let alone determine whether there is a multi-point grounding problem. Therefore, there is an urgent need for an intelligent diagnosis method for outer sheath grounding faults in the live operation state of high-voltage cables. Carrying out live detection during the operation of high-voltage cables can not only achieve accurate and reliable positioning of the fault point, but also effectively reduce the troubleshooting time.

[0004] like Figure 1 As shown in the figure, after the outer sheath of the high-voltage cable is grounded, a ground loop phenomenon will be formed with the direct grounding end. At this time, tens of amperes of current will be induced in the grounding wire. Long-term operation will cause heating and damage to the main insulation. It is usually detected by a clamp ammeter, that is, a Rogowski coil is used to measure the current size in the grounding of the shield layer. When the three-phase value deviation is large, it is considered that there is a grounding fault in the outer sheath somewhere in the cable loop. At this time, it is necessary to apply for a power outage to check and repair the specific grounding point through full on-site inspection, insulation testing, and withstand voltage testing. Depending on the length of the cable and the number of grounding fault points, the entire processing process generally takes more than 2 days.

[0005] That is to say, the existing technology cannot locate the faulty grounding point of the outer sheath when the cable is energized, and is even more unable to determine whether there is a multi-point grounding problem. The high-voltage cable needs to be shut down, and the high-voltage conductor or armor needs to be pressurized or impacted or an arc test needs to be performed. The staff will patrol the line on site based on the impact discharge sound and arc smell emitted by the fault point to gradually locate the fault point. Especially for the problem of multi-point grounding of the outer sheath, the outer sheath grounding fault is difficult to detect, insufficiently effective, and time-consuming. Summary of the invention

[0006] In view of the problems in the prior art, the embodiments of the present application provide a live intelligent diagnosis system and method for high-voltage cable outer sheath faults, which can at least partially solve the problems in the prior art.

[0007] On the one hand, the present application proposes a high-voltage cable outer sheath fault live intelligent diagnosis system, comprising:

[0008] At least two current detection devices, each of which is respectively sleeved on the high-voltage cable to be tested, at least one of the at least two current detection devices is fixed in position during current detection, and the other current detection devices move along the length direction of the high-voltage cable to be tested during current detection;

[0009] A data analysis device is connected to the current detection device and performs fault diagnosis on the high-voltage cable to be tested according to the current detected by the current detection device.

[0010] In some embodiments, the system further comprises:

[0011] A wireless transmission device is electrically connected to the current detection device and is communicatively connected to the data analysis device, and is used to send the current detected by the current detection device to the data analysis device through a wireless transmission method.

[0012] In some embodiments, the current sensing device includes a flexible coil.

[0013] In some embodiments, the system further comprises:

[0014] A clamp ammeter connected to the data analysis device to detect the grounding current of the outer sheath of the high-voltage cable to be tested and send the grounding current to the data analysis device;

[0015] The data analysis device also performs fault diagnosis on the high-voltage cable to be tested according to the ground current detected by the clamp ammeter.

[0016] On the other hand, the present application proposes a method for intelligent diagnosis of high-voltage cable outer sheath fault live, based on the intelligent diagnosis system for high-voltage cable outer sheath fault live described in any of the above embodiments, the method comprising:

[0017] When it is determined that a ground fault occurs on the outer sheath of the high-voltage cable to be tested, at least two current detection devices are installed on the high-voltage cable to be tested;

[0018] Keeping at least one of the current detection devices fixed relative to the outer sheath of the high-voltage cable to be tested, and slowly moving other current detection devices along the length direction of the high-voltage cable to be tested;

[0019] Acquire in real time a first current detected by a current detection device at a fixed position and a second current detected by a current detection device moving along the length direction of the high-voltage cable to be tested;

[0020] The grounding fault point of the outer sheath of the high-voltage cable to be tested is determined according to the first current and the second current.

[0021] In some embodiments, the method further comprises:

[0022] Using a clamp ammeter to detect the grounding current of the outer sheath of the high-voltage cable to be tested;

[0023] The grounding fault state of the outer sheath of the high-voltage cable to be tested is determined according to the grounding current, and the grounding fault state includes no grounding fault or a grounding fault.

[0024] In some embodiments, determining the grounding fault point of the outer sheath of the high-voltage cable to be tested according to the first current and the second current includes:

[0025] For each current detection device moving along the length direction of the high-voltage cable to be tested, perform the following operations:

[0026] Calculating in real time the deviation of a second current detected by the current detection device relative to a first current detected by a current detection device at a fixed position;

[0027] According to the deviation, the grounding fault point of the outer sheath of the high-voltage cable to be tested is determined.

[0028] In some embodiments, determining the grounding fault point of the outer sheath of the high-voltage cable to be tested according to the deviation includes:

[0029] If the deviation is greater than a preset threshold, and the deviation first gradually increases and then gradually decreases with time, a grounding fault point of the outer sheath of the high-voltage cable to be tested is determined to be the position of the current detection device moving along the length direction of the high-voltage cable to be tested when the deviation is at its maximum value.

[0030] In some embodiments, determining the grounding fault point of the outer sheath of the high-voltage cable to be tested according to the deviation includes:

[0031] If the deviation is greater than a preset threshold value and the deviation has no increasing trend over time or if the deviation of the second current detected by the current detection device relative to the first current detected by the current detection device at a fixed position is always less than a preset threshold value during the process of the current detection device moving a preset length along the length direction of the high-voltage cable to be tested, a new position is determined, at least one of the current detection devices is kept fixed at the new position, and other current detection devices are slowly moved along the length direction of the high-voltage cable to be tested;

[0032] Real-time acquisition of a first current detected by a current detection device that is fixed at the new position and a second current detected by a current detection device that moves slowly along the length direction of the high-voltage cable to be tested;

[0033] The grounding fault point of the outer sheath of the high-voltage cable to be tested is determined according to the first current and the second current.

[0034] In some embodiments, a current detection device moving along the length direction of the high-voltage cable to be tested traverses the high-voltage cable to be tested.

[0035] An embodiment of the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the method for energized intelligent diagnosis of high-voltage cable outer sheath faults described in any of the above embodiments are implemented.

[0036] An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the live intelligent diagnosis method for high-voltage cable outer sheath faults described in any of the above embodiments are implemented.

[0037] The embodiment of the present application provides an intelligent diagnosis system for high-voltage cable outer sheath fault under power on, including at least two current detection devices, each of which is respectively mounted on the high-voltage cable to be tested, at least one of the at least two current detection devices is fixed in position when performing current detection, and the other current detection devices move along the length direction of the high-voltage cable to be tested when performing current detection; a data analysis device is connected to the current detection device, and performs fault diagnosis on the high-voltage cable to be tested according to the current detected by the current detection device. In this way, it is possible to detect the grounding current of the outer sheath of the running high-voltage cable, accurately locate the outer sheath grounding point through power on detection, and have a good troubleshooting effect on the single-phase cable with multiple outer sheath grounding defects, greatly shortening the fault handling time. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0039] Figure 1 It is a structural schematic diagram of a high-voltage cable grounding loop current detection solution provided in this application.

[0040] Figure 2 It is a structural schematic diagram of a live intelligent diagnosis system for high-voltage cable outer sheath faults provided in one embodiment of the present application.

[0041] Figure 3 It is a schematic diagram of the detection principle of a flexible coil provided in an embodiment of the present application.

[0042] Figure 4 It is a structural schematic diagram of a high-voltage cable grounding loop current detection solution provided in one embodiment of the present application.

[0043] Figure 5 It is a schematic diagram of the detection current distribution law on both sides of the grounding point of the high-voltage cable outer sheath provided by an embodiment of the present application.

[0044] Figure 6 It is a schematic diagram of structural parameters of a cable provided in one embodiment of the present application.

[0045] Figure 7a It is a design diagram of a cable outer sheath grounding fault model constructed in one embodiment of the present application.

[0046] Figure 7b yes Figure 7a Schematic diagram of the cable outer sheath grounding fault model in .

[0047] Figure 8 It is a schematic diagram of cable grounding loop current detection simulation results provided in an embodiment of the present application.

[0048] Fig. 9 It is a schematic comparison diagram of the current deviation ratio A distribution law and the simulation model provided in one embodiment of the present application.

[0049] Fig.10 It is a flow chart of a method for intelligent diagnosis of high-voltage cable outer sheath fault live provided in one embodiment of the present application.

[0050] Fig.11 It is a partial flow chart of a method for intelligent diagnosis of high-voltage cable outer sheath fault live provided in one embodiment of the present application.

[0051] Fig.12 It is a partial flow chart of a method for intelligent diagnosis of high-voltage cable outer sheath fault live provided in one embodiment of the present application.

[0052] Fig.13 It is a partial flow chart of a method for intelligent diagnosis of high-voltage cable outer sheath fault live provided in one embodiment of the present application.

[0053] Fig.14 It is a flow chart of a method for intelligent diagnosis of high-voltage cable outer sheath fault live provided in one embodiment of the present application.

[0054] Fig.15 It is a schematic diagram of the physical structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Here, the illustrative embodiments of the present application and their descriptions are used to explain the present application, but are not intended to limit the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be arbitrarily arranged with each other.

[0056] The terms “first”, “second”, etc. used in this document do not specifically refer to an order or sequence, nor are they used to limit this application. They are only used to distinguish elements or operations described with the same technical terms.

[0057] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0058] As used herein, "and / or" includes any and all permutations of the items described.

[0059] Figure 2is a structural schematic diagram of a high-voltage cable outer sheath fault live intelligent diagnosis system provided in an embodiment of the present application, such as Figure 2 As shown, the high-voltage cable outer sheath fault live intelligent diagnosis system provided in the embodiment of the present application includes:

[0060] At least two current detection devices 10, each of which is respectively sleeved on the high-voltage cable to be tested, at least one of the at least two current detection devices 10 is fixed in position during current detection, and the other current detection devices 10 move along the length direction of the high-voltage cable to be tested during current detection;

[0061] The data analysis device 20 is connected to the current detection device 10 and performs fault diagnosis on the high-voltage cable to be tested according to the current detected by the current detection device 10 .

[0062] In some embodiments, the system further includes: a wireless transmission device, electrically connected to the current detection device and communicatively connected to the data analysis device, for sending the current detected by the current detection device to the data analysis device via a wireless transmission method.

[0063] like Figure 2 As shown, in some embodiments, the current detection device 10 includes a flexible coil, which can also be called a through-type current transformer, which is sleeved on the high-voltage cable to be tested during operation. In other words, the high-voltage cable to be tested passes through the center of the flexible coil during operation.

[0064] In some embodiments, the system also includes: a clamp ammeter, connected to the data analysis device, detecting the grounding current of the outer sheath of the high-voltage cable to be tested, and sending the grounding current to the data analysis device; the data analysis device also performs fault diagnosis on the high-voltage cable to be tested based on the grounding current detected by the clamp ammeter.

[0065] Taking the current detection device as a flexible coil as an example, the working principle of the high-voltage cable outer sheath fault live intelligent diagnosis system provided by the present application is described in detail below.

[0066] like Figure 3 As shown in the figure, the metal outer sheath of the high-voltage cable in operation induces a small current. In order to avoid the formation of a grounding loop due to the double-end grounding of the metal outer sheath, one end of the metal outer sheath is generally directly grounded, and the other end is grounded through a sheath protector. When a high-voltage cable has an outer sheath grounding fault, the grounding point will form a grounding loop I2 with the direct grounding end, which is generally 30% to 80% of the high-voltage cable operating current I1, and the size of the grounding loop I2 is related to the cable length and the distance from the grounding point. Therefore, the difference between the two can be measured by a flexible coil, and the fault grounding point can be found by the change law of the difference.

[0067] When a ground fault is found in the outer sheath of the cable, the mobile flexible coil can be used to distribute the high-voltage cable current information according to the fault phase, and the collected current information can be sent to the data analysis device via a wireless transmission device. Based on the data comparison and analysis results, it is output whether there is a fault grounding point of the outer sheath between any two flexible coils. The detection principle is as follows Figure 4 shown.

[0068] Furthermore, when the flexible coils are located on both sides of the fault point (such as flexible coil 3 and flexible coil 4), the distribution law of the detection current on both sides of the grounding point of the high-voltage cable outer sheath is as follows: Figure 5 As shown in the figure, the detection value is ΔI, which is the difference between the load current I1 flowing through the main conductor of the high-voltage cable and the induced current I2 on the sheath grounding. The closer to the fault point, the larger the detection value ΔI of the flexible coil, and the results on both sides are symmetrically distributed.

[0069] Furthermore, when the fault is not between the two, that is, when the fault point is outside the two flexible coils (such as flexible coil 1 and flexible coil 2), the flexible coil detection value ΔI is almost unchanged.

[0070] Furthermore, therefore, by fixing the position of one flexible coil, the detection value is recorded as ΔI1, and the other n flexible coils move radially horizontally, and each detection result is recorded as ΔI n The test results can be transmitted to the background data analysis device in real time through the wireless transmission device.

[0071] Furthermore, the data analysis device compares the values ​​of the movable coil and the fixed coil in real time, records the difference between the two at this time, and calculates the deviation (or deviation ratio) A.

[0072] A=(ΔI n -ΔI1) / ΔI1

[0073] Furthermore, when the deviation ratio between the two is greater than 10% and as the flexible coil continues to move, the deviation ratio A will gradually increase. At this time, the background data processing device will issue an alarm and feedback to the on-site personnel that the grounding point is nearby until the deviation ratio A gradually decreases. At this time, the inflection point is the location of the outer sheath grounding fault point.

[0074] The above scheme was simulated and analyzed: according to the circuit model built according to the actual flow, the primary load current is 422A, and the cable model structure parameters are as follows: Figure 6. The total length of the cable is 868m and is divided into three parts. Among them, cable1 is a cable with a length of 434m, cable2 is a cable with a length of 300m, and cable3 is a cable with a length of 134m. According to the actual project requirements, the outer sheaths of the left end of cable1 and the right end of cable3 are not grounded, and the right end of cable1 and the left end of cable2 are grounded. In the actual project, cable2 and cable3 were originally the same cable, but a single-phase grounding fault occurred in the outer sheath in the middle. Therefore, in order to simulate the current situation, it was disconnected from 134m, and the outer sheaths of the right end of phase A of cable2 and the left end of phase A of cable3 were grounded. The cable outer sheath grounding fault model is constructed as follows: Figure 7a As shown in the schematic diagram Figure 7b shown.

[0075] The simulation results are as follows Figure 8 The curve in the figure is the current measurement result near the fault grounding point, where the red curve I f (left) is the test result of flexible coil 3′, I f (right) is the test result of flexible coil 3, and the blue curve is the difference between the two.

[0076] Fig. 9 It is a comparison diagram of the current deviation ratio A distribution law and the simulation model. When two current detection coils are set on the same side, as shown in flexible coil 1 and flexible coil 2, the measured current values ​​are both 180A, the maximum difference between the two is 6A, and the maximum current deviation ratio A is 3.3%. When the high-voltage cable grounding fault point is set between the two current detection coils, as shown in flexible coil 3 and flexible coil 3'. It can be seen that the grounding current measured by one coil is about 180A, and the maximum grounding current measured by the other coil is about 215A, and the maximum current deviation ratio A is 19.4%. It can be determined that the outer sheath grounding fault point is at 734m. The simulation analysis results are in line with the expectations of the scheme and are consistent with the results of the built model.

[0077] It can be seen that the live intelligent diagnosis system for high-voltage cable outer sheath faults provided in the present application can detect the grounding current of the outer sheath of the running high-voltage cable, accurately locate the outer sheath grounding point through live detection, and has a good effect on troubleshooting multi-point outer sheath grounding defects in single-phase cables, greatly shortening the fault handling time.

[0078] Based on the high-voltage cable outer sheath fault live intelligent diagnosis system provided in any of the above embodiments, the present application also provides a high-voltage cable outer sheath fault live intelligent diagnosis method, such as Fig.10 As shown, the embodiment of the present application provides a live intelligent diagnosis method for a high-voltage cable outer sheath fault, comprising:

[0079] S101, when it is determined that a ground fault occurs on the outer sheath of the high-voltage cable to be tested, at least two current detection devices are installed on the high-voltage cable to be tested;

[0080] S102, keeping at least one of the current detection devices fixed relative to the outer sheath of the high-voltage cable to be tested, and slowly moving other current detection devices along the length direction of the high-voltage cable to be tested;

[0081] S103, acquiring in real time a first current detected by a current detection device whose position remains fixed and a second current detected by a current detection device that moves along the length direction of the high-voltage cable to be tested;

[0082] S104: Determine a grounding fault point of an outer sheath of the high-voltage cable to be tested according to the first current and the second current.

[0083] like Fig.11 As shown, in some embodiments, the method further includes:

[0084] S001, using a clamp ammeter to detect the grounding current of the outer sheath of the high-voltage cable to be tested;

[0085] S002. Determine a grounding fault state of the outer sheath of the high-voltage cable to be tested according to the grounding current, wherein the grounding fault state includes no grounding fault or a grounding fault.

[0086] like Fig.12 As shown, in some embodiments, determining the grounding fault point of the outer sheath of the high-voltage cable to be tested according to the first current and the second current includes:

[0087] For each current detection device moving along the length direction of the high-voltage cable to be tested, perform the following operations:

[0088] S1041, calculating in real time the deviation of the second current detected by the current detection device relative to the first current detected by a current detection device at a fixed position;

[0089] S1042. Determine the grounding fault point of the outer sheath of the high-voltage cable to be tested according to the deviation.

[0090] In some embodiments, determining the grounding fault point of the outer sheath of the high-voltage cable to be tested based on the deviation includes: if the deviation is greater than a preset threshold, and the deviation first gradually increases and then gradually decreases with time, then determining that a grounding fault point of the outer sheath of the high-voltage cable to be tested is the position of the current detection device moving along the length direction of the high-voltage cable to be tested when the deviation is at its maximum value.

[0091] like Fig.13As shown, in some embodiments, determining the grounding fault point of the outer sheath of the high-voltage cable to be tested according to the deviation includes:

[0092] S10431. If the deviation is greater than a preset threshold value and the deviation has no increasing trend over time or if the deviation of the second current detected by the current detection device relative to the first current detected by the current detection device at a fixed position is always less than a preset threshold value during the process of the current detection device moving a preset length along the length direction of the high-voltage cable to be tested, then determine a new position, keep at least one of the current detection devices fixed at the new position, and slowly move other current detection devices along the length direction of the high-voltage cable to be tested;

[0093] S10432, acquiring in real time a first current detected by the current detection device that is fixed at the new position and a second current detected by the current detection device that moves slowly along the length direction of the high-voltage cable to be tested;

[0094] S10433. Determine a grounding fault point of the outer sheath of the high-voltage cable to be tested according to the first current and the second current.

[0095] In some embodiments, a current detection device moving along the length direction of the high-voltage cable to be tested traverses the high-voltage cable to be tested.

[0096] In order to better understand the live intelligent diagnosis method for high-voltage cable outer sheath fault provided by the present application, the live intelligent diagnosis method for high-voltage cable outer sheath fault provided by the present application is described in detail through a specific embodiment below.

[0097] like Fig.14 As shown, the live intelligent diagnosis method for high-voltage cable outer sheath fault provided by the present application includes:

[0098] In the first step, the inspection personnel use a clamp ammeter to detect whether there is a large difference in the sheath grounding current. If no abnormality is found, it is considered that the sheath grounding current of the high-voltage cable is normal;

[0099] In the second step, if an obvious ground loop is found in the sheath of a certain phase cable, intelligent diagnosis and detection of cable sheath faults will be carried out: a fixed flexible detection coil is installed, and a mobile flexible coil moves slowly along the cable path;

[0100] The third step is to determine whether the current deviation ratio displayed on the detection background is greater than 10%. If not, return to the second step to continue the detection;

[0101] Step 4: If the current deviation ratio is greater than 10%, continue to move along the radial direction of the cable to determine whether the test result has a continuous increasing trend. If not, return to step 2 for continuous testing.

[0102] Step 5: If the current deviation ratio is greater than 10% and the current deviation continues to increase when moving along the radial direction of the cable, the cable continues to move along the radial direction;

[0103] Step 6: Observe whether the current deviation ratio displayed on the detection background is less than 10% and stable. If the current deviation continues to increase, return to step 5 and continue detection;

[0104] Step 7: If the current deviation ratio displayed on the backend is less than 10% and remains stable, it is determined that the inflection point of the current deviation ratio is the outer sheath grounding fault point;

[0105] Step 8: Check if there are any cables that have not been tested. If yes, return to step 2 and continue testing. To prevent multiple grounding points, the whole process needs to be tested.

[0106] Step 9: If the detection end point has been reached, the detection ends.

[0107] It can be seen that the present application can detect the grounding current of the outer sheath of the running high-voltage cable, accurately locate the outer sheath grounding point through live detection, and has a good effect on the troubleshooting of multi-point outer sheath grounding defects in single-phase cables, greatly shortening the fault handling time. Since the circulating current near the outer sheath grounding point is large, it is obviously different from the position of the distant grounding point. Therefore, by introducing the current deviation ratio as a comparison basis, it is found through simulation analysis that the current deviation ratio on both sides of the grounding point has a significant change. When the current deviation ratio exceeds 10%, the fault area can be effectively locked, and the ultimate accurate fault location can be achieved through extreme value analysis.

[0108] Fig.15 A schematic diagram of the physical structure of an electronic device provided in an embodiment of the present application is shown in FIG. Fig.15 As shown, the electronic device may include: a processor 201, a communication interface 202, a memory 203 and a communication bus 204, wherein the processor 201, the communication interface 202 and the memory 203 communicate with each other through the communication bus 204. The processor 201 may call the logic instructions in the memory 203 to execute the method described in any of the above embodiments.

[0109] In addition, the logic instructions in the above-mentioned memory 203 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art, and the computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0110] This embodiment discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided by the above-mentioned method embodiments.

[0111] This embodiment provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program enables the computer to execute the methods provided by the above-mentioned method embodiments.

[0112] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0113] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0114] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0115] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0116] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0117] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A high-voltage cable outer sheath fault live intelligent diagnosis system, characterized in that: include: At least two current detection devices, each of which is respectively sleeved on the high-voltage cable to be tested, at least one of the at least two current detection devices is fixed in position during current detection, and the other current detection devices move along the length direction of the high-voltage cable to be tested during current detection; A data analysis device is connected to the current detection device and performs fault diagnosis on the high-voltage cable to be tested according to the current detected by the current detection device.

2. The system according to claim 1, characterized in that The system further comprises: A wireless transmission device is electrically connected to the current detection device and is communicatively connected to the data analysis device, and is used to send the current detected by the current detection device to the data analysis device through a wireless transmission method.

3. The system according to claim 1 or 2, characterized in that: The current detection device includes a flexible coil.

4. The system according to claim 1, characterized in that The system further comprises: A clamp ammeter connected to the data analysis device to detect the grounding current of the outer sheath of the high-voltage cable to be tested, and send the grounding current to the data analysis device; The data analysis device also performs fault diagnosis on the high-voltage cable to be tested according to the ground current detected by the clamp ammeter.

5. A method for intelligent diagnosis of high-voltage cable outer sheath fault, characterized in that: Based on the high-voltage cable outer sheath fault live intelligent diagnosis system according to any one of claims 1 to 4 above, the method comprises: When it is determined that a ground fault occurs on the outer sheath of the high-voltage cable to be tested, at least two current detection devices are installed on the high-voltage cable to be tested; Keeping at least one of the current detection devices fixed relative to the outer sheath of the high-voltage cable to be tested, and slowly moving other current detection devices along the length direction of the high-voltage cable to be tested; Acquire in real time a first current detected by a current detection device at a fixed position and a second current detected by a current detection device moving along the length direction of the high-voltage cable to be tested; The grounding fault point of the outer sheath of the high-voltage cable to be tested is determined according to the first current and the second current.

6. The method according to claim 5, characterized in that The method further comprises: Using a clamp ammeter to detect the grounding current of the outer sheath of the high-voltage cable to be tested; The grounding fault state of the outer sheath of the high-voltage cable to be tested is determined according to the grounding current, and the grounding fault state includes no grounding fault or a grounding fault.

7. The method according to claim 5, characterized in that The step of determining the grounding fault point of the outer sheath of the high-voltage cable to be tested according to the first current and the second current comprises: For each current detection device moving along the length direction of the high-voltage cable to be tested, perform the following operations: Calculating in real time the deviation of a second current detected by the current detection device relative to a first current detected by a current detection device at a fixed position; According to the deviation, the grounding fault point of the outer sheath of the high-voltage cable to be tested is determined.

8. The method according to claim 7, characterized in that Determining the grounding fault point of the outer sheath of the high-voltage cable to be tested according to the deviation includes: If the deviation is greater than a preset threshold, and the deviation first gradually increases and then gradually decreases with time, a grounding fault point of the outer sheath of the high-voltage cable to be tested is determined to be the position of the current detection device moving along the length direction of the high-voltage cable to be tested when the deviation is at its maximum value.

9. The method according to claim 7, characterized in that: Determining the grounding fault point of the outer sheath of the high-voltage cable to be tested according to the deviation includes: If the deviation is greater than a preset threshold value and the deviation has no increasing trend over time or if the deviation of the second current detected by the current detection device relative to the first current detected by the current detection device at a fixed position is always less than a preset threshold value during the process of the current detection device moving a preset length along the length direction of the high-voltage cable to be tested, a new position is determined, at least one of the current detection devices is kept fixed at the new position, and other current detection devices are slowly moved along the length direction of the high-voltage cable to be tested; Real-time acquisition of a first current detected by a current detection device that is fixed at the new position and a second current detected by a current detection device that moves slowly along the length direction of the high-voltage cable to be tested; The grounding fault point of the outer sheath of the high-voltage cable to be tested is determined according to the first current and the second current.

10. The method according to claim 5, characterized in that A current detection device moving along the length direction of the high-voltage cable to be tested traverses the high-voltage cable to be tested.

11. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 5 to 10 are implemented.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 5 to 10 are implemented.

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