A method, device, equipment and medium for monitoring cable-to-ground leakage current
By obtaining the AC loop current information of the terminal box and judging the leakage status of the cable, the problems of low monitoring accuracy and narrow application range in the prior art are solved, and efficient monitoring of floor leakage current is achieved.
Patent Information
- Application Number
- CN202410059031.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-15
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2044-01-15
AI Technical Summary
When monitoring cable leakage, especially in substations, the existing technology has problems such as large manpower investment, strong subjectivity and low accuracy, and the existing monitoring methods are difficult to apply to the judgment of multi-port networks and other types of faults.
通过获取端子箱交流环路不同端的电流信息，确定剩余电流差动电流和单相差动电流，根据特定的启动判据和差流判据判断电缆的漏电状态，实现对地漏电电流的高效监测。
It improves the accuracy and coverage of cable monitoring of ground leakage current, and can more accurately judge leakage status, and is suitable for detection of multi-port networks and other types of faults.
Smart Images
Figure CN117930072B_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present disclosure relate to the field of intelligent monitoring technology, and in particular to a method, device, equipment and medium for monitoring cable-to-ground leakage current. Background Art
[0002] At present, there is a trend that substations below 220kV are unmanned, and substations above 500kV are undermanned, which puts higher requirements on the daily operation and maintenance of substations. In history, there have been many accidents of cable heating and fire caused by leakage of power supply loop cables. At present, the main methods for monitoring leakage of loop cables in substations are: visual manual inspection, infrared temperature measurement, and residual current monitoring.
[0003] Whether it is manual inspection by visual method or infrared temperature measurement, a lot of manpower and material resources are required. Manual inspection by visual method is highly subjective. Whether the problem can be found is related to the skill level, mental state and fault development stage of the operation and maintenance personnel, and it is difficult to accurately find the fault. The infrared temperature measurement method is slightly less affected by subjective factors than the manual inspection by visual method, but there is still the problem of whether the temperature measurement location is obscured, and it also depends on the current fault development stage at the time of temperature measurement. The probability of accurately finding the fault is not high. Residual current monitoring is generally a single-end system or a double-end system, which can only judge whether there is single-phase leakage in the monitoring circuit. It is not applicable to multi-port networks, nor can it judge other types of faults. Summary of the invention
[0004] The embodiments of the present disclosure provide a method, device, equipment and medium for monitoring cable-to-ground leakage current, thereby improving the monitoring level of cable-to-ground leakage current.
[0005] In a first aspect, a method for monitoring cable-to-ground leakage current is provided, comprising:
[0006] Acquire current information at different ends of the AC loop of the terminal box, and determine the residual current differential current and the single-phase differential current respectively based on the current information at the different ends;
[0007] If the residual current differential current satisfies the first start-up criterion, determining the leakage state of the cable according to the residual current differential current and the first differential current criterion;
[0008] If the single-phase differential current meets the second starting criterion, the leakage state of the cable is determined according to the single-phase differential current and the second differential current criterion.
[0009] In a second aspect, a device for monitoring cable-to-ground leakage current is provided, comprising:
[0010] An information acquisition module, used to acquire current information at different ends of the AC loop of the terminal box, and determine the residual current differential current and the single-phase differential current respectively based on the current information at the different ends;
[0011] A first leakage state determination module, configured to determine the leakage state of the cable according to the residual current differential current and the first differential current criterion if the residual current differential current meets the first starting criterion;
[0012] The second leakage state determination module is used to determine the leakage state of the cable according to the single-phase differential current and the second differential current criterion if the single-phase differential current meets the second starting criterion.
[0013] According to a third aspect, an electronic device is provided, the electronic device comprising:
[0014] at least one processor; and;
[0015] a memory communicatively connected to the at least one processor; wherein,
[0016] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the cable-to-ground leakage current monitoring method provided in the first aspect above.
[0017] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a controller to implement the method for monitoring cable-to-ground leakage current provided in the first aspect of the embodiment of the present disclosure when executed.
[0018] The disclosed embodiments provide a method, device, equipment and medium for monitoring cable-to-ground leakage current, including: obtaining current information at different ends of the AC loop of the terminal box, and determining the residual current differential current and the single-phase differential current respectively based on the current information at the different ends; if the residual current differential current meets the first starting criterion, the leakage state of the cable is determined according to the residual current differential current and the first differential current criterion; if the single-phase differential current meets the second starting criterion, the leakage state of the cable is determined according to the single-phase differential current and the second differential current criterion. The method determines the leakage state of the cable according to different starting criteria and differential current criteria satisfied by the current information. Compared with the prior art, the technical solution improves the monitoring level of the AC power supply loop of the substation and the related cable-to-ground leakage current.
[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the embodiments of the present disclosure. Other features of the embodiments of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0021] Figure 1 It is a flow chart of a method for monitoring cable-to-ground leakage current provided in Embodiment 1 of the present disclosure;
[0022] Figure 2 It is a schematic diagram of obtaining current information at different ends of an AC loop of a terminal box provided by the first embodiment of the present disclosure;
[0023] Figure 3 It is a structural schematic diagram of a cable-to-ground leakage current monitoring device provided in Embodiment 2 of the present disclosure;
[0024] Figure 4 A schematic structural diagram of an electronic device for implementing an embodiment of the present disclosure is provided. DETAILED DESCRIPTION
[0025] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only embodiments of part of the present disclosure, not all embodiments. Based on the embodiments in the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the embodiments of the present disclosure.
[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.
[0027] Embodiment 1
[0028] Figure 1This is a flow chart of a cable-to-ground leakage current monitoring method provided in the first embodiment of the present disclosure. This embodiment is applicable to the case of monitoring the cable-to-ground leakage current. The method can be performed by a cable-to-ground leakage current monitoring device. The cable-to-ground leakage current monitoring device can be implemented in the form of hardware and / or software. The cable-to-ground leakage current monitoring device can be configured in an electronic device. Figure 1 As shown, the method includes:
[0029] S110, obtaining current information at different ends of the AC loop of the terminal box, and determining the residual current differential current and the single-phase differential current respectively based on the current information at different ends.
[0030] In this embodiment, the terminal box can be a transfer construction line, which marks the branch lines and provides a convenient interface device for wiring and line tracing. The AC loop can provide power support for the outdoor high-voltage open-loop switch and electric knife switch of the substation.
[0031] Specifically, a residual current sensor can be set at the incoming line, outgoing line and / or load end of the terminal box to obtain current information at different ends of the AC loop of the terminal box, wherein the current information at different ends includes the incoming line current, the outgoing line current and the load line current; or, the current information at different ends includes the incoming line current and the outgoing line current.
[0032] Continuing with the above description, after obtaining the current information at different ends, the residual current differential current and the single-phase differential current can be determined according to the current information at different ends, wherein the residual current differential current can be the difference between the current vectors of each item at different ends of the distribution line and the sum of non-zero currents, and the single-phase differential current can be the difference between the single-phase current vectors at different ends of the distribution line and the sum of non-zero currents.
[0033] For example, Figure 2 A schematic diagram for obtaining current information at different ends of the AC loop of the terminal box is given, such as Figure 2 As shown, two residual current sensors RCT1 and RCT2 are placed at the M end of the incoming line and the N end of the outgoing line of the terminal box AC loop. N-2 residual current sensors RCT3, ..., RCTN are deployed at the L end of the load. Two current sensors CTA1 and CTA2 are placed at the M end of the A phase incoming line and the N end of the A phase outgoing line of the terminal box AC loop. N-2 A phase current sensors CTA3, ..., CTAN are deployed at the L end of the load, and then the residual current differential current and the single-phase differential current can be determined.
[0034] S120: If the residual current differential current meets the first starting criterion, determine the leakage state of the cable according to the residual current differential current and the first differential current criterion.
[0035] In this embodiment, after the residual current differential current is obtained, the residual current differential current can be judged according to the first starting criterion, and the first starting criterion can include: the value of the residual current differential current is greater than or equal to the residual current differential current starting constant value. Exemplarily, the first starting criterion can be expressed as:
[0036] I d1 ≥I op0
[0037] Among them, I d1 is the residual current differential current at each end, I op0 is the residual current differential current starting setting, for example, I op0 It can be 10mA. It should be noted that when the inherent residual current is greater than 10mA, I op0 It can be taken as 20mA, where the inherent residual current can be the residual current existing in the system itself due to differences in manufacturing processes.
[0038] Specifically, if the residual current differential current meets the first starting criterion, the leakage state of the cable can be determined based on the residual current differential current and the first differential current criterion, wherein the leakage state may include asymmetric leakage and / or three-phase leakage, and the first differential current criterion includes: the value of the residual current differential current is greater than or equal to the first braking current times the first braking coefficient.
[0039] Exemplarily, when the current information of different terminals includes the current at the incoming line M terminal, the current at the outgoing line N terminal, and the current at the load L terminal, the first differential current criterion may be:
[0040] I d1 ≥k1*I r1
[0041] Wherein, k1 may be a first braking coefficient, and the first braking coefficient may be a preset value, such as 0.6, I r1 It can be the first braking current, the first braking current I r1 It can be expressed as:
[0042] I r1 =|I M -(I N +I L )|
[0043] Among them, I M ,I N ,I L They represent the steady-state residual current differential current on both sides of M and N and the L end of the load side respectively.
[0044] Exemplarily, when the current information of different terminals includes the current at the incoming line M terminal and the current at the outgoing line N terminal, the first differential current criterion may be:
[0045] I d3 ≥k3*I r3
[0046] Wherein, k3 may be a first braking coefficient, and the first braking coefficient may be a preset value, such as: 0.6, I r3 It can be the first braking current, the first braking current I r3 It can be expressed as:
[0047] I r3 =|I M -I N |
[0048] Among them, I M ,I N Represent the steady-state residual current differential current on both sides of M and N respectively.
[0049] S130: If the single-phase differential current meets the second starting criterion, determine the leakage state of the cable according to the single-phase differential current and the second differential current criterion.
[0050] In this embodiment, after the single-phase differential current is obtained, the single-phase differential current can be judged according to the second starting criterion, and the second starting criterion includes: the value of the single-phase differential current is greater than or equal to the single-phase differential current starting constant value. Exemplarily, the second starting criterion may include:
[0051] I dA ≥I opA0
[0052] Among them, I dA It can be the differential current of phase A at each end, I opA0 It can be a single-phase differential current starting setting, for example, I opA0 It can be 30mA.
[0053] Specifically, if the single-phase differential current meets the second starting criterion, the leakage state of the cable can be determined based on the single-phase differential current and the second differential current criterion, wherein the second differential current criterion includes: the value of the single-phase differential current is greater than or equal to the second braking current times the second braking coefficient.
[0054] Exemplarily, when the current information of different terminals includes the current at the incoming line M terminal, the current at the outgoing line N terminal, and the current at the load L terminal, the second differential current criterion may be:
[0055] I d2 ≥k2*I r2
[0056] Wherein, k2 may be a second braking coefficient, and the second braking coefficient may be a preset value, such as: 0.8, I r2It can be the second braking current, the first braking current I r2 It can be expressed as:
[0057] I r2 =max(|I L，A |,|I M，A |,|I N，A |)
[0058] Among them, |I L，A | can be expressed as the absolute value of the A-phase current at the L end of the load side, |I M，A | can be expressed as the absolute value of the A-phase current at the M terminal, |I N，A |It can be expressed as the absolute value of the A-phase current at the N terminal.
[0059] Exemplarily, when the current information of different terminals includes the current at the incoming line M terminal and the current at the outgoing line N terminal, the second differential current criterion may be:
[0060] I d4 ≥k4*I r4
[0061] Wherein, k4 may be a second braking coefficient, and the second braking coefficient may be a preset value, such as: 0.8, I r4 It can be the second braking current, the first braking current I r4 It can be expressed as:
[0062] I r4 =max(|I M，A |,|I N，A |)
[0063] Among them, |I M，A | can be expressed as the absolute value of the A-phase current at the M terminal, |I N，A |It can be expressed as the absolute value of the A-phase current at the N terminal.
[0064] This embodiment provides a method for monitoring cable-to-ground leakage current, including: obtaining current information at different ends of the terminal box AC loop, and determining the residual current differential current and the single-phase differential current respectively based on the current information at the different ends; if the residual current differential current meets the first starting criterion, the leakage state of the cable is determined according to the residual current differential current and the first differential current criterion; if the single-phase differential current meets the second starting criterion, the leakage state of the cable is determined according to the single-phase differential current and the second differential current criterion. This technical solution determines the leakage state of the cable according to different starting criteria and differential current criteria met by the current information, thereby improving the monitoring level of the cable-to-ground leakage current.
[0065] As an optional implementation manner provided by this embodiment, the method provided by this embodiment may also include:
[0066] When it is confirmed that there is no leakage from the cable to the ground, the residual current differential current element and the single-phase differential current element are reset;
[0067] The residual current differential element is constructed based on different ends of the terminal box, and the single-phase differential element is constructed based on single phases at different ends of the terminal box.
[0068] It should be noted that the leakage state of the cable to the ground is determined by performing leakage judgment on the residual current differential current and single-phase differential current of the cable. After the leakage state of the cable to the ground is determined, if the existence time of the leakage state does not meet the preset time, it is determined that the cable to the ground has no leakage, wherein the preset time can be a pre-set duration.
[0069] Continuing with the above description, when it is determined that there is no leakage between the cable and the ground, the residual current differential current element and the single-phase differential current element can be reset, wherein the residual current differential element is constructed based on different ends of the terminal box, and the single-phase differential element is constructed based on the single phases of different ends of the terminal box.
[0070] In one embodiment, determining the residual current differential current and the single-phase differential current respectively based on the current information of the different terminals includes:
[0071] Determine the residual current differential current based on the absolute value of the sum of the currents at each end;
[0072] The single-phase differential current is determined based on the absolute value of the sum of the single-phase components of the current at each end.
[0073] Specifically, the residual current differential current can be determined according to the absolute value of the sum of the currents at each end. Exemplarily, when the current information at different ends includes the current at the incoming line M end, the current at the outgoing line N end, and the current at the load L end, the residual current differential current can be expressed as:
[0074]
[0075] in, It represents the sum of the steady-state residual current differential currents on both sides of M and N and the L end of the load side; when the current information of different ends includes the current at the incoming line M end and the current at the outgoing line N end, the residual current differential current can also be expressed as:
[0076]
[0077] in, It represents the sum of the difference currents of the steady-state residual currents at both ends of M and N;
[0078] Specifically, the single-phase differential current can be determined according to the absolute value of the sum of the single-phase components of the current at each end. For example, taking the A-phase current as an example, when the current information at different ends includes the incoming line M-terminal current, the outgoing line N-terminal current, and the load L-terminal current, the single-phase differential current can be expressed as:
[0079]
[0080] Among them, I L，A It can represent the A-phase current at the L end of the load side, I M，A It can represent the A phase current at the M terminal, I N，A It can represent the A phase current at the N terminal.
[0081] When the current information at different ends includes the current at the incoming line M end and the current at the outgoing line N end, the single-phase differential current can also be expressed as:
[0082]
[0083] Among them, I M，A It can represent the A phase current at the M terminal, I N，A It can represent the A phase current at the N terminal.
[0084] In one embodiment, determining the leakage state of the cable according to the residual current differential current and the first differential current criterion includes:
[0085] If the residual current differential current satisfies the first differential current criterion, it is determined that the leakage state of the cable is asymmetric leakage.
[0086] Specifically, when the residual current differential current meets the first starting criterion, it is determined whether the residual current differential current meets the first differential current criterion. When the residual current differential current meets the first differential current criterion, it can be determined that the leakage state of the cable is asymmetric leakage.
[0087] In one embodiment, determining the leakage state of the cable according to the residual current differential current and the first differential current criterion includes:
[0088] If the residual current differential current meets the first differential current criterion, the duration of the leakage state is timed after the first delay time. If the duration of the leakage state meets the first preset duration, the leakage state of the cable to the ground is determined to be asymmetric leakage.
[0089] In this embodiment, when it is determined that the residual current differential flow meets the first differential current criterion, the leakage state of the cable can be timed after the first delay time, and it is determined whether the duration of the leakage state of the cable meets the first preset duration. When the leakage state of the cable meets the first preset duration, it can be determined that the leakage state of the cable to the ground is asymmetric leakage. Among them, the first delay time can be a preset delay time that needs to be met for the start of timing of the asymmetric leakage state of the cable, and the first preset duration can be a preset duration that needs to be met for the asymmetric leakage.
[0090] In one embodiment, determining the leakage state of the cable according to the single-phase differential current and the second differential current criterion includes:
[0091] If the single-phase differential current satisfies the second differential current criterion, it is determined that the leakage state of the cable is three-phase leakage.
[0092] Specifically, when the single-phase differential current meets the second starting criterion, it is determined whether the single-phase differential current meets the second differential current criterion. When the single-phase differential current meets the second differential current criterion, it can be determined that the leakage state of the cable is three-phase leakage.
[0093] In one embodiment, determining the leakage state of the cable according to the single-phase differential current and the second differential current criterion includes:
[0094] If the single-phase differential current meets the second differential current criterion, the duration of the leakage state is timed after the second delay time. If the duration of the leakage state meets the second preset duration, the leakage state of the cable to the ground is determined to be three-phase leakage.
[0095] In this embodiment, when it is determined that the single-phase differential current meets the second differential current criterion, the leakage state of the cable can be timed after the second delay time, and it is determined whether the duration of the leakage state of the cable meets the second preset duration. When the leakage state of the cable meets the second preset duration, it can be determined that the leakage state of the cable to the ground is three-phase leakage. Among them, the second delay time can be a preset delay time that needs to be met for the start of timing of the three-phase leakage state of the cable, and the second preset duration can be a preset duration that needs to be met for the three-phase leakage.
[0096] Embodiment 2
[0097] Figure 3 This is a schematic diagram of the structure of a monitoring device for cable-to-ground leakage current provided in the second embodiment of the present disclosure. Figure 3 As shown, the device includes: an information acquisition module 210 , a first leakage state determination module 220 , and a second leakage state determination module 230 .
[0098] The information acquisition module 210 is used to acquire current information at different ends of the AC loop of the terminal box, and determine the residual current differential current and the single-phase differential current based on the current information at the different ends;
[0099] A first leakage state determination module 220, configured to determine the leakage state of the cable according to the residual current differential current and the first differential current criterion if the residual current differential current meets the first start criterion;
[0100] The second leakage state determination module 230 is configured to determine the leakage state of the cable according to the single-phase differential current and the second differential current criterion if the single-phase differential current meets the second starting criterion.
[0101] Embodiment 2 of the present disclosure provides a device for monitoring cable-to-ground leakage current, which improves the monitoring level of cable-to-ground leakage current.
[0102] Optionally, the current information of different ends includes the incoming line current, the outgoing line current and the load current;
[0103] Alternatively, the current information of different ends includes the incoming current and the outgoing current.
[0104] Optionally, the information acquisition module 210 is used to:
[0105] Determine the residual current differential current based on the absolute value of the sum of the currents at each end;
[0106] The single-phase differential current is determined based on the absolute value of the sum of the single-phase components of the current at each end.
[0107] Optionally, the first start criterion includes:
[0108] The value of the residual current differential current is greater than or equal to the residual current differential current starting constant value.
[0109] Optionally, the second start criterion includes:
[0110] The value of the single-phase differential current is greater than or equal to the single-phase differential current starting setting.
[0111] Optionally, the first differential current criterion includes:
[0112] The value of the residual current differential current is greater than or equal to the first braking current times the first braking coefficient.
[0113] Optionally, the first leakage state determining module 220 is configured to:
[0114] If the residual current differential current satisfies the first differential current criterion, it is determined that the leakage state of the cable is asymmetric leakage.
[0115] Optionally, the first leakage state determining module 220 may also be used to:
[0116] If the residual current differential current meets the first differential current criterion, the duration of the leakage state is timed after the first delay time. If the duration of the leakage state meets the first preset duration, the leakage state of the cable to the ground is determined to be asymmetric leakage.
[0117] Optionally, the second differential current criterion includes:
[0118] The value of the single-phase differential current is greater than or equal to the second braking current times the second braking coefficient.
[0119] Optionally, the second leakage state determining module 230 is configured to:
[0120] If the single-phase differential current satisfies the second differential current criterion, it is determined that the leakage state of the cable is three-phase leakage.
[0121] Optionally, the second leakage state determining module 230 may also be used to:
[0122] If the single-phase differential current meets the second differential current criterion, the duration of the leakage state is timed after the second delay time. If the duration of the leakage state meets the second preset duration, the leakage state of the cable to the ground is determined to be three-phase leakage.
[0123] Optionally, the device further comprises:
[0124] A reset module is used to reset the residual current differential current element and the single-phase differential current element when it is determined that there is no leakage of electricity from the cable to the ground;
[0125] The residual current differential element is constructed based on different ends of the terminal box, and the single-phase differential element is constructed based on single phases at different ends of the terminal box.
[0126] The monitoring device for cable-to-ground leakage current provided in the embodiments of the present disclosure can execute the monitoring method for cable-to-ground leakage current provided in any embodiment of the embodiments of the present disclosure, and has the corresponding functional modules and beneficial effects of the execution method.
[0127] Embodiment 3
[0128] Figure 4A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the embodiments of the present disclosure described and / or claimed herein.
[0129] like Figure 4 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.
[0130] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.
[0131] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microprocessor, etc. The processor 11 executes the various methods and processes described above, such as a method for monitoring cable-to-ground leakage current.
[0132] In some embodiments, the method for monitoring the cable-to-ground leakage current may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for monitoring the cable-to-ground leakage current described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the method for monitoring the cable-to-ground leakage current by any other appropriate means (e.g., by means of firmware).
[0133] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.
[0134] The computer programs for implementing the methods of the embodiments of the present disclosure may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine as a stand-alone software package and partially on a remote machine, or entirely on a remote machine or server.
[0135] In the context of the disclosed embodiments, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device, or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
[0136] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).
[0137] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.
[0138] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.
[0139] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in the embodiments of the present disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions of the embodiments of the present disclosure can be achieved, and this document does not limit this.
[0140] The above specific implementations do not constitute a limitation on the protection scope of the embodiments of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the embodiments of the present disclosure shall be included in the protection scope of the embodiments of the present disclosure.
Claims
1. A method for monitoring cable-to-ground leakage current, characterized in that: include: Acquire current information at different ends of the AC loop of the terminal box, and determine the residual current differential current and the single-phase differential current respectively based on the current information at the different ends; If the residual current differential current satisfies the first start-up criterion, determining the leakage state of the cable according to the residual current differential current and the first differential current criterion; If the single-phase differential current meets the second starting criterion, determining the leakage state of the cable according to the single-phase differential current and the second differential current criterion; The first start criterion includes: The value of the residual current differential current is greater than or equal to the residual current differential current starting fixed value; The second start criterion includes: The value of the single-phase differential current is greater than or equal to the single-phase differential current starting setting; The first differential current criterion includes: The value of the residual current differential current is greater than or equal to the first braking current times the first braking coefficient; The second differential current criterion includes: The value of the single-phase differential current is greater than or equal to the second braking current times the second braking coefficient.
2. The method according to claim 1, characterized in that: The current information of different ends includes the incoming line current, the outgoing line current and the load end current; Alternatively, the current information of different ends includes the incoming current and the outgoing current.
3. The method according to claim 1, characterized in that Based on the current information of the different ends, respectively determining the residual current differential current and the single-phase differential current includes: Determine the residual current differential current based on the absolute value of the sum of the currents at each end; The single-phase differential current is determined based on the absolute value of the sum of the single-phase components of the current at each end.
4. The method according to claim 1, characterized in that: Determining the leakage state of the cable according to the residual current differential current and the first differential current criterion includes: If the residual current differential current satisfies the first differential current criterion, it is determined that the leakage state of the cable is asymmetric leakage.
5. The method according to claim 1, characterized in that Determining the leakage state of the cable according to the residual current differential current and the first differential current criterion includes: If the residual current differential current meets the first differential current criterion, the duration of the leakage state is timed after the first delay time. If the duration of the leakage state meets the first preset duration, the leakage state of the cable to the ground is determined to be asymmetric leakage.
6. The method according to claim 1, characterized in that Determining the leakage state of the cable according to the single-phase differential current and the second differential current criterion includes: If the single-phase differential current satisfies the second differential current criterion, it is determined that the leakage state of the cable is three-phase leakage.
7. The method according to claim 1, characterized in that Determining the leakage state of the cable according to the single-phase differential current and the second differential current criterion includes: If the single-phase differential current meets the second differential current criterion, the duration of the leakage state is timed after the second delay time. If the duration of the leakage state meets the second preset duration, the leakage state of the cable to the ground is determined to be three-phase leakage.
8. The method according to claim 1, characterized in that Also includes: When it is confirmed that there is no leakage from the cable to the ground, the residual current differential current element and the single-phase differential current element are reset; The residual current differential current element is constructed based on different ends of the terminal box, and the single-phase differential current element is constructed based on single phases at different ends of the terminal box.
9. A monitoring device for cable-to-ground leakage current, which is controlled by the monitoring method for cable-to-ground leakage current as claimed in any one of claims 1 to 8, characterized in that: include: An information acquisition module, used to acquire current information at different ends of the AC loop of the terminal box, and determine the residual current differential current and the single-phase differential current respectively based on the current information at the different ends; A first leakage state determination module, configured to determine the leakage state of the cable according to the residual current differential current and the first differential current criterion if the residual current differential current meets the first starting criterion; The second leakage state determination module is used to determine the leakage state of the cable according to the single-phase differential current and the second differential current criterion if the single-phase differential current meets the second starting criterion.
10. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the cable-to-ground leakage current monitoring method as described in any one of claims 1-8.
11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for monitoring cable-to-ground leakage current as described in any one of claims 1 to 8 is implemented.