A backup protection method and related device for remote reclosing waveform monitoring function

Abstract

The application provides a backup protection method and related device of remote reclosing waveform monitoring function, and belongs to the technical field of power system protection equipment. The method comprises the following steps: monitoring the current signal in the protected line in real time; judging the execution action of the execution mechanism based on the monitored current signal, cutting off the protected line when the disconnection operation is performed, and collecting the current transient waveform in the preset time window before and after the disconnection operation to obtain waveform data; identifying the fault type based on the obtained waveform data, wherein the fault type comprises lightning stroke fault and short circuit fault; and determining the execution action of the execution mechanism according to the fault type. The application combines waveform collection and fault type identification, realizes accurate distinction between lightning stroke fault and short circuit fault, automatically determines the reclosing strategy accordingly, avoids secondary damage caused by blind closing, has low threshold current monitoring capability, and significantly improves the intelligent level, power supply recovery efficiency and operation safety of the backup protection device.

Description

Technical Field

[0001] This invention belongs to the technical field of power system protection equipment, specifically relating to a backup protection method and related devices with remote reclosing and waveform monitoring functions. Background Technology

[0002] Backup protectors are critical devices in power systems used to protect lines or equipment from faults such as overloads, short circuits, and lightning strikes. However, existing backup protectors have the following four shortcomings: First, excessively high operating current leads to insensitive response to low-current faults. Traditional backup protectors, in order to avoid maloperation caused by load fluctuations, harmonic interference, or instantaneous inrush currents, typically set a high operating current threshold (such as several times the rated current). This makes it impossible for them to promptly identify and disconnect low-amplitude fault currents such as minor insulation damage, high-resistance short circuits caused by poor contact, or inter-turn short circuits in motors. The long-term existence of such faults will gradually lead to line heating, accelerated insulation aging, and even fire or equipment damage. Especially in situations with high power quality requirements, such as data centers, precision manufacturing, and communication base stations, this "non-operation" blind spot becomes a potential threat to sensitive equipment.

[0003] Secondly, they lack sufficient resistance to lightning strikes and are susceptible to damage from instantaneous high-energy surges. The surge currents generated by lightning strikes or operational overvoltages, ranging from microseconds to hundreds of kA, have a response time of only milliseconds for the mechanical structures inside traditional backup protectors, such as the thermal trip bimetallic strip and electromagnetic trip coil. This makes it difficult to effectively suppress the steep surges of lightning currents in the nanosecond to microsecond range. More importantly, the strong arcs or surface flashovers formed by high-amplitude lightning currents between contacts can cause contact welding, mechanism jamming, or even casing rupture. Even if they do not break down on the spot, the fit between internal components such as varistors and the protector may gradually deteriorate due to cumulative damage from multiple lightning strikes, eventually leading to the loss of protection function. This deterioration process is irreversible and invisible.

[0004] Third, reclosing relies on manual operation, resulting in low power restoration efficiency. When a protector trips due to overload, short circuit, or lightning strike, most existing designs lack automatic reclosing functionality, requiring maintenance personnel to manually reclose it on-site. This is particularly inconvenient in remote mountainous areas, such as transmission lines, wind farms, photovoltaic power stations, unattended base stations, street light control boxes, and charging piles. The long distances, poor transportation, and severe weather conditions like thunderstorms and snow not only increase safety risks but also cause a single reset to take several hours to several days, significantly increasing maintenance costs and extending power outage time, thus hindering the advancement of distribution automation.

[0005] Fourth, the lack of waveform monitoring and fault recording functions makes fault tracing difficult. Most existing protectors are purely electromechanical or simple electronic structures, only providing switching signals indicating whether they have operated or not. They cannot record the instantaneous voltage and current waveforms at the time of a fault. Maintenance personnel cannot determine whether the fault is caused by a lightning strike or an internal short circuit, nor can they obtain crucial information such as the amplitude, wavefront time, half-peak time, and whether there were multiple return strokes of the lightning current. They also cannot determine whether there is a delay between the protector's operating time and the fault's initiation time. The lack of waveform data makes it impossible to accurately locate the fault cause, assess whether the protector's actual operating characteristics match the field requirements, and further hinders the modification of weak points in the circuit. This results in faults being handled passively rather than proactively prevented, and the improvement of system reliability lacks data support. Summary of the Invention

[0006] This invention provides a backup protection method and related device with remote reclosing and waveform monitoring function, which solves the defects of existing backup protectors such as large operating current, weak lightning protection capability, low reclosing efficiency and lack of waveform monitoring, and realizes low operating current protection, strong lightning protection, remote automatic reclosing and all-time lightning waveform monitoring.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a backup protection method with remote reclosing and waveform monitoring function, comprising: Real-time monitoring of current signals in the protected circuit; The actuator's action is determined based on the monitored current signal, wherein: When the actuator performs a tripping operation, the protected line is disconnected; at the same time, the instantaneous current waveform within a preset time window before and after the tripping operation is collected to obtain waveform data. Based on the obtained waveform data, the fault type is identified, including lightning strike faults and short circuit faults; The actuator's action is determined based on the type of fault.

[0008] Preferably, the execution action of the actuator is determined based on the monitored current signal. Specifically, the method is as follows: When the monitored current signal exceeds the preset operating current threshold, the actuator is determined to perform a tripping operation.

[0009] Preferably, the preset time window includes: from a first preset time point before the fault occurs to a second preset time point after the tripping operation.

[0010] Preferably, the step of identifying the fault type based on the obtained waveform data specifically includes: The waveform feature parameters of the waveform data are extracted and compared with preset lightning fault waveform templates and short circuit fault waveform templates to determine the fault type.

[0011] Preferably, the waveform characteristic parameters include at least one of the following: current amplitude change rate, current duration, waveform leading edge steepness, and pulse number.

[0012] Preferably, determining the actuator's action based on the fault type specifically includes: When a lightning strike fault is identified, the actuator is determined to perform a reclosing operation. When a short-circuit fault is detected, the actuator is determined to maintain the open state and an alarm is issued.

[0013] Secondly, the present invention provides a backup protector with remote reclosing capability and waveform monitoring function, comprising: The current monitoring module is used to monitor the current signal in the protected line in real time. The actuator action judgment module is used to determine the actuator's action based on the monitored current signal. When the actuator's action is a tripping operation, the protected line is disconnected. At the same time, the instantaneous current waveform within a preset time window before and after the tripping operation is collected to obtain waveform data. In addition, the actuator's action is determined according to the fault type. A waveform monitoring module is used to identify fault types based on the obtained waveform data, including lightning strike faults and short circuit faults.

[0014] Thirdly, the present invention provides an electronic device including a processor and a memory, wherein the memory stores computer instructions, and when the computer instructions are executed by the processor, the electronic device performs the method described thereon.

[0015] Fourthly, the present invention provides a computer program product, the computer program product including computer-executable instructions, which, when executed, implement the method described.

[0016] Fifthly, the present invention provides a computer-readable storage medium storing computer-executable instructions that, when executed by a processor, implement the method described herein.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a backup protection method with remote reclosing and waveform monitoring. It monitors the current signal in the protected line in real time and determines the tripping operation of the actuator based on the monitoring results. Simultaneously, it acquires the instantaneous current waveform within a preset time window before and after tripping the line. Based on this waveform data, it identifies lightning strike faults or short-circuit faults. Finally, it determines the subsequent action of the actuator according to the fault type. This not only achieves rapid response and accurate disconnection of low-amplitude fault currents but also provides data for reclosing decisions through waveform acquisition and fault type identification, avoiding secondary damage that may be caused by blind closing of traditional protectors. Furthermore, since it automatically determines the action without requiring manual on-site fault type assessment, it significantly improves the safety and intelligence level of reclosing, effectively solving the technical problems of large operating current, difficulty in fault tracing, and reliance on manual operation for reclosing in existing technologies. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating an embodiment of the present invention. Detailed Implementation

[0019] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0020] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0021] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0022] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0023] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0025] Example 1 This embodiment provides a backup protection method with remote reclosing and waveform monitoring function, including: Real-time monitoring of current signals in the protected circuit; The actuator's action is determined based on the monitored current signal, wherein: When the actuator performs a tripping operation, the protected line is disconnected; at the same time, the instantaneous current waveform within a preset time window before and after the tripping operation is collected to obtain waveform data. In this embodiment, when the monitored current signal exceeds the preset operating current threshold, the actuator is determined to perform a tripping operation.

[0026] In this embodiment, the preset operating current threshold is 0.5A.

[0027] In this embodiment, the preset time window includes a period from a first preset time point before the fault occurs to a second preset time point after the tripping operation.

[0028] In this embodiment, the first preset time point is 100ms; the second preset time point is 100ms.

[0029] Based on the obtained waveform data, the fault type is identified, including lightning strike faults and short circuit faults; In this embodiment, waveform feature parameters of the waveform data are extracted, and the waveform feature parameters are compared with preset lightning fault waveform templates and short circuit fault waveform templates to determine the fault type.

[0030] In this embodiment, the waveform characteristic parameters include at least one of the following: current amplitude change rate, current duration, waveform leading edge steepness, and pulse number.

[0031] The actuator's action is determined based on the type of fault.

[0032] In this embodiment, when a lightning strike fault is identified, the actuator is determined to perform a reclosing operation. When a short-circuit fault is detected, the actuator is determined to maintain the open state and an alarm is issued.

[0033] Example 2 This embodiment provides a backup protection method with remote reclosing and waveform monitoring function, including the following steps: Real-time acquisition of current signals; when the current is ≥0.5A, the actuator is driven to open the circuit breaker; at the same time, the current waveform from 100ms before to 100ms after is acquired. When the fault type is identified as a lightning strike fault based on the current waveform, a closing command is generated to control the actuator to reclose the circuit and restore power supply.

[0034] Example 3 This embodiment provides a backup protector with remote reclosing capability and waveform monitoring function, comprising: The current monitoring module is used to monitor the current signal in the protected line in real time. The actuator action judgment module is used to determine the actuator's action based on the monitored current signal. When the actuator's action is a tripping operation, the protected line is disconnected. At the same time, the instantaneous current waveform within a preset time window before and after the tripping operation is collected to obtain waveform data. In addition, the actuator's action is determined according to the fault type. A waveform monitoring module is used to identify fault types based on the obtained waveform data, including lightning strike faults and short circuit faults.

[0035] In this embodiment, the protected line is connected in series with a lightning protection module, which consists of a multi-stage surge suppression unit, including a pre-mounted zinc oxide arrester (residual voltage ≤1.5kV), a gas discharge tube (response time ≤10ns), and a TVS diode (peak power ≥15kW), forming a gradient energy absorption structure to improve lightning protection capability (withstands lightning current ≥20kA, 8 / 20μs waveform).

[0036] In this embodiment, the actuator is an electrically operated circuit breaker with a built-in permanent magnet operating mechanism to achieve rapid opening (≤20ms) and closing (≤30ms).

[0037] In this embodiment, the waveform monitoring module includes a high-speed AD converter (sampling rate ≥1MHz, resolution ≥12bit) and a data storage unit (capacity ≥1GB) to collect current waveform data in real time during normal operation and fault disconnection.

[0038] Example 4 This embodiment also provides a computing device. The computing device includes a bus, a processor, a memory, and a communication interface. The processor, memory, and communication interface communicate with each other via the bus. The computing device can be a server or a terminal device. It should be understood that this application does not limit the number of processors and memory in the computing device.

[0039] A bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, a bus can include a path for transmitting information between various components of a computing device (e.g., memory, processor, communication interfaces).

[0040] The processor may include any one or more of the following: central processing unit (CPU), graphics processing unit (GPU), tensor processing unit (TPU), application specific integrated circuit (ASIC), field-programmable gate array (FPGA), microprocessor (MP), or digital signal processor (DSP).

[0041] Memory can include volatile memory, such as random access memory (RAM). Processors can also include non-volatile memory. volatile memory, such as read-only memory (ROM). ROM (memory only), flash memory, hard disk drive (HDD), or solid state drive (SSD).

[0042] The memory stores executable program code, which the processor executes to implement the functions of the aforementioned units, thereby achieving, for example, the method described in Embodiment 1. That is, the memory may store instructions for the methods and functions relating to the computing device in any of the above embodiments.

[0043] The communication interface uses transceiver modules such as, but not limited to, network interface cards and transceivers to enable communication between computing devices and other devices or communication networks.

[0044] Example 5 This embodiment also provides a computer-readable storage medium storing computer instructions that, when executed by a processor, cause the processor to perform the methods and functions of the computing device involved in any of the above embodiments.

[0045] Generally, the various embodiments of this disclosure can be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. Some aspects can be implemented in hardware, while others can be implemented in firmware or software, which can be executed by a controller, microprocessor, or other computing device. Although various aspects of the embodiments of this disclosure are shown and described as block diagrams, flowcharts, or represented using some other illustration, it should be understood that the blocks, apparatuses, systems, techniques, or methods described herein can be implemented as, as non-limiting examples, in hardware, software, firmware, dedicated circuitry or logic, general-purpose hardware or controllers or other computing devices, or some combination thereof.

[0046] Example 6 This embodiment provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer-executable instructions, such as instructions included in program modules, which execute in a device on a target real or virtual processor to perform the processes / methods as described above with reference to the accompanying drawings. Typically, program modules include routines, programs, libraries, objects, classes, components, data structures, etc., that perform specific tasks or implement specific abstract data types. In various embodiments, the functionality of program modules can be combined or divided among program modules as needed. The machine-executable instructions for the program modules can execute within a local or distributed device. In a distributed device, the program modules can reside in both local and remote storage media.

[0047] Computer program code used to implement the methods of this disclosure may be written in one or more programming languages. This computer program code may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus, such that when executed by the computer or other programmable data processing apparatus, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be performed. The program code may be executed entirely on a computer, partially on a computer, as a stand-alone software package, partially on a computer and partially on a remote computer, or entirely on a remote computer or server.

[0048] In the context of this disclosure, computer program code or related data may be carried on any suitable carrier to enable a device, apparatus, or processor to perform the various processes and operations described above. Examples of carriers include signals, computer-readable media, and so on. Examples of signals may include electrical, optical, radio, sound, or other forms of propagation signals, such as carrier waves, infrared signals, etc.

[0049] Computer-readable media can be any tangible medium that contains or stores programs for or relating to an instruction execution system, apparatus, or device, or a data storage device such as a data center containing one or more available media. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable media can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. More detailed examples of computer-readable storage media include electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0050] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A backup protection method with remote reclosing and waveform monitoring function, characterized in that, include: Real-time monitoring of current signals in the protected circuit; The actuator's action is determined based on the monitored current signal, wherein: When the actuator performs a tripping operation, the protected line is disconnected; at the same time, the instantaneous current waveform within a preset time window before and after the tripping operation is collected to obtain waveform data. Based on the obtained waveform data, the fault type is identified, including lightning strike faults and short circuit faults; The actuator's action is determined based on the type of fault.

2. The backup protection method with remote reclosing and waveform monitoring function according to claim 1, characterized in that, The actuator's action is determined based on the monitored current signal. The specific method is as follows: When the monitored current signal exceeds the preset operating current threshold, the actuator is determined to perform a tripping operation.

3. The backup protection method with remote reclosing and waveform monitoring function according to claim 1, characterized in that, The preset time window includes: from the first preset time point before the fault occurs to the second preset time point after the tripping operation.

4. The backup protection method with remote reclosing and waveform monitoring function according to claim 1, characterized in that, The method of identifying fault types based on the obtained waveform data specifically includes: The waveform feature parameters of the waveform data are extracted and compared with preset lightning fault waveform templates and short circuit fault waveform templates to determine the fault type.

5. A backup protection method with remote reclosing and waveform monitoring function according to claim 1, characterized in that, The waveform characteristic parameters include at least one of the following: current amplitude change rate, current duration, waveform leading edge steepness, and pulse number.

6. A backup protection method with remote reclosing and waveform monitoring function according to claim 1, characterized in that, The step of determining the actuator's action based on the fault type specifically includes: When a lightning strike fault is identified, the actuator is determined to perform a reclosing operation. When a short-circuit fault is detected, the actuator is determined to maintain the open state and an alarm is issued.

7. A backup protector with remote reclosing capability and waveform monitoring function, characterized in that, include: The current monitoring module is used to monitor the current signal in the protected line in real time. The actuator action judgment module is used to determine the actuator's action based on the monitored current signal. When the actuator's action is a tripping operation, the protected line is disconnected. At the same time, the instantaneous current waveform within a preset time window before and after the tripping operation is collected to obtain waveform data. In addition, the actuator's action is determined according to the fault type. A waveform monitoring module is used to identify fault types based on the obtained waveform data, including lightning strike faults and short circuit faults.

8. An electronic device, characterized in that, It includes a processor and a memory, the memory storing computer instructions that, when executed by the processor, cause the electronic device to perform the method of any one of claims 1 to 6.

9. A computer program product, characterized in that, The computer program product includes computer-executable instructions that, when executed, implement the method of any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions that, when executed by a processor, implement the method of any one of claims 1 to 6.

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