A method, apparatus, equipment and storage medium for detecting grounding faults in low-voltage lines.

Abstract

This invention discloses a method, apparatus, device, and storage medium for detecting grounding faults in low-voltage lines. Multiple Rogowski coils are spaced apart on the grounding wire of the low-voltage line. These coils are used for non-contact detection of the AC current on the grounding wire. The AC current detected by each Rogowski coil at the same acquisition time is converted from analog to digital and integrated to obtain a voltage data sequence. A filtering algorithm is used to filter the voltage data sequence to obtain an effective leakage current data sequence. Characteristic information representing leakage faults is extracted from the leakage current data sequence. Based on this characteristic information, the location of the grounding leakage fault in the low-voltage line is determined, and the fault location is sent to the mobile terminal of maintenance personnel. This invention achieves the judgment of grounding faults in low-voltage lines through non-contact detection of abnormal currents, reducing labor costs, improving detection efficiency and accuracy, reducing power outage time caused by leakage, and reducing economic losses.

Description

Technical Field

[0001] This invention relates to power detection technology, and more particularly to a method, apparatus, equipment, and storage medium for detecting grounding faults in low-voltage lines. Background Technology

[0002] Low-voltage line grounding faults are often hidden and difficult to detect, posing a huge challenge to the safe operation of the power system.

[0003] Current troubleshooting methods mostly rely on manual inspection, which often requires a lot of time and human resources. Furthermore, the process is easily limited by human experience, making it difficult to guarantee detection efficiency and accuracy, thus increasing the risk of fault diagnosis and decision-making. Summary of the Invention

[0004] This invention provides a method, apparatus, equipment, and storage medium for detecting grounding faults in low-voltage lines, thereby reducing labor costs, improving detection efficiency and accuracy, reducing power outage time caused by leakage, and minimizing economic losses.

[0005] In a first aspect, the present invention provides a method for detecting grounding faults in low-voltage lines, wherein multiple Rogowski coils are spaced apart on the grounding wire of the low-voltage line, and the Rogowski coils are used for non-contact detection of alternating current on the grounding wire. The method includes:

[0006] The AC current detected by each Rogowski coil at the same acquisition time is converted from analog to digital and integrated to obtain a voltage data sequence;

[0007] The voltage data sequence is filtered using a filtering algorithm to obtain an effective leakage current data sequence;

[0008] Extract feature information characterizing leakage faults from the leakage data sequence;

[0009] Based on the aforementioned feature information, the location of the grounding leakage fault in the low-voltage line is determined.

[0010] The location of the fault is sent to the mobile terminal of the maintenance personnel.

[0011] Optionally, the Rogowski coil adopts an open-loop structure, and a filtering algorithm is used to filter the voltage data sequence to obtain an effective leakage current data sequence, including:

[0012] The voltage data sequence is filtered using a double averaging filter algorithm to obtain an effective leakage current data sequence.

[0013] Optionally, the double averaging filtering algorithm is as follows:

[0014]

[0015] Where z[n] is the leakage current data sequence after double averaging filtering, n is the sampling point number, which is also the Rogowski coil number, M is the length of the sliding window, which is also the total number of sampling points, and x[n] is the voltage data of the nth sampling point.

[0016] Optionally, the Rogowski coil adopts a closed-loop structure, and a filtering algorithm is used to filter the voltage data sequence to obtain an effective leakage current data sequence, including:

[0017] The voltage data sequence is filtered using a wavelet denoising filtering algorithm to obtain an effective leakage current data sequence.

[0018] Optionally, a wavelet denoising filtering algorithm is used to filter the voltage data sequence to obtain an effective leakage current data sequence, including:

[0019] Wavelet decomposition was performed on the voltage data sequence to obtain wavelet coefficients at multiple different levels;

[0020] Thresholding is performed on multiple wavelet coefficients to retain valid wavelet coefficients;

[0021] Data reconstruction is performed on the effective wavelet coefficients to obtain an effective leakage current data sequence.

[0022] Optionally, the thresholding process employs a hard thresholding function, which is:

[0023]

[0024] Where T is the threshold, W s (a,b) are the wavelet coefficients obtained by wavelet decomposition of the voltage data sequence S, where a is the scale used for wavelet decomposition and b is the displacement used for wavelet decomposition.

[0025] Optionally, the thresholding process employs a soft thresholding function, which is:

[0026]

[0027] Where T is the threshold, |W a,b | represents the wavelet coefficients obtained by wavelet decomposition of the voltage data sequence S, where a is the scale used in wavelet decomposition and b is the displacement used in wavelet decomposition.

[0028] Secondly, the present invention also provides a low-voltage line grounding fault detection device, wherein a plurality of Rogowski coils are spaced apart on the grounding wire of the low-voltage line, and the Rogowski coils are used for non-contact detection of the alternating current on the grounding wire. The device includes:

[0029] The data integration module is used to perform analog-to-digital conversion and integrate the AC current detected by each Rogowski coil at the same acquisition time to obtain a voltage data sequence;

[0030] The filtering module is used to filter the voltage data sequence using a filtering algorithm to obtain an effective leakage current data sequence;

[0031] The feature information extraction module is used to extract feature information characterizing leakage faults from the leakage data sequence;

[0032] The fault location determination module is used to determine the fault location of the low-voltage line as a grounding leakage fault based on the feature information.

[0033] The fault reporting module is used to send the fault location to the mobile terminal of the operation and maintenance personnel.

[0034] Thirdly, the present invention also provides an electronic device, comprising:

[0035] One or more processors;

[0036] Storage device for storing one or more programs;

[0037] When the one or more programs are executed by the one or more processors, the one or more processors implement the low-voltage line grounding fault detection method provided in the first aspect of the present invention.

[0038] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the low-voltage line grounding fault detection method provided in the first aspect of the present invention.

[0039] This invention provides a low-voltage line grounding fault detection method. Multiple Rogowski coils are spaced apart on the grounding wire of the low-voltage line. These coils are used for non-contact detection of the AC current on the grounding wire. The AC current detected by each Rogowski coil at the same acquisition time is converted from analog to digital and integrated to obtain a voltage data sequence. A filtering algorithm is used to filter the voltage data sequence to obtain an effective leakage current data sequence. Characteristic information representing leakage faults is extracted from the leakage current data sequence. Based on this characteristic information, the location of the grounding leakage fault in the low-voltage line is determined, and the fault location is sent to the mobile terminal of maintenance personnel. This invention achieves the judgment of low-voltage line grounding faults through non-contact detection of abnormal current, reducing labor costs, improving detection efficiency and accuracy, reducing power outage time caused by leakage, and reducing economic losses.

[0040] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A flowchart of a low-voltage line grounding fault detection method provided by the present invention;

[0043] Figure 2 A schematic diagram of the structure of a low-voltage line grounding fault detection device provided by the present invention;

[0044] Figure 3 This is a schematic diagram of the structure of an electronic device provided by the present invention.

[0045] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0046] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0048] Figure 1 This is a flowchart of a low-voltage line grounding fault detection method provided by the present invention. This embodiment is applicable to grounding fault detection in low-voltage lines. Multiple Rogowski coils are spaced apart on the grounding wire of the low-voltage line. The Rogowski coils are used for non-contact detection of AC current on the grounding wire. This method can be executed by the low-voltage line grounding fault detection device provided by the present invention. This device can be implemented by software and / or hardware, and is typically configured in electronic equipment, such as... Figure 1 As shown, the method for detecting grounding faults in low-voltage lines specifically includes the following steps:

[0049] S101. The AC current detected by each Rogowski coil at the same acquisition time is converted from analog to digital and integrated to obtain a voltage data sequence.

[0050] In this embodiment of the invention, the alternating current detected by all Rogowski coils on the grounding wire at the same sampling time is acquired, and the alternating current is processed by analog-to-digital conversion to obtain the voltage data corresponding to each Rogowski coil. Then, the voltage data corresponding to each Rogowski coil is integrated according to the order of sampling points (that is, the arrangement order of the Rogowski coils) to obtain a voltage data sequence.

[0051] S102. The voltage data sequence is filtered using a filtering algorithm to obtain an effective leakage current data sequence.

[0052] In this embodiment of the invention, a filtering algorithm is used to filter the voltage data sequence to obtain an effective leakage current data sequence. During the current signal acquisition process, the acquired current signal often contains a large amount of high-frequency noise and interference due to external electromagnetic interference and equipment noise. To ensure the accuracy of current detection, the acquired signal must be filtered to obtain an effective leakage current data sequence.

[0053] S103. Extract feature information characterizing leakage faults from leakage current data sequences.

[0054] In this embodiment of the invention, a feature extraction algorithm is used to extract characteristic information representing leakage faults from the leakage current data sequence. For example, the characteristic information may be the amplitude of the leakage voltage. In other embodiments of the invention, the characteristic information may be other attributes, which are not limited herein.

[0055] S104. Determine the location of the grounding leakage fault in the low-voltage line based on the feature information.

[0056] In this embodiment of the invention, the location of a grounding leakage fault in a low-voltage line is determined based on feature information. For example, the feature information can be the amplitude of the leakage voltage. When the amplitude of the leakage voltage detected by a Rogowski coil is greater than a preset value, it is determined that a grounding leakage fault exists at the location of the Rogowski coil.

[0057] S105. Send the fault location to the mobile terminal of the maintenance personnel.

[0058] In this embodiment of the invention, the detected fault location is sent to the mobile terminal of the maintenance personnel via a mobile network, so that the maintenance personnel can repair the fault in a timely manner and avoid significant economic losses.

[0059] This invention provides a low-voltage line grounding fault detection method. Multiple Rogowski coils are spaced apart on the grounding wire of the low-voltage line. These coils are used for non-contact detection of the AC current on the grounding wire. The AC current detected by each Rogowski coil at the same acquisition time is converted from analog to digital and integrated to obtain a voltage data sequence. A filtering algorithm is used to filter the voltage data sequence to obtain an effective leakage current data sequence. Characteristic information representing leakage faults is extracted from the leakage current data sequence. Based on this characteristic information, the location of the grounding leakage fault in the low-voltage line is determined, and the fault location is sent to the mobile terminal of maintenance personnel. This invention achieves the judgment of low-voltage line grounding faults through non-contact detection of abnormal current, reducing labor costs, improving detection efficiency and accuracy, reducing power outage time caused by leakage, and reducing economic losses.

[0060] In some embodiments of this invention, the Rogowski coil employs an open-loop structure and a novel U-shaped clamping structure, allowing it to be easily fixed to an electrical guide rail, thus enabling quick and easy installation and removal. This design significantly reduces the time and manpower required for maintenance and inspection, especially during high-altitude operations, simplifying the operation process and improving work efficiency. The Rogowski coil is connected to an ESP32 microcontroller.

[0061] Furthermore, this invention uses a model aircraft battery (7.4V) as the power supply module to provide power to the entire ESP32 microcontroller. This battery is small, lightweight, and easy to carry, and its output voltage and power are suitable for portable devices, ensuring stable power supply during movement.

[0062] Open-loop Rogowski coils are used for non-contact current detection in circuits. They work by inducing a current signal, converting it into a voltage signal, and then transmitting it to an ADC module for processing. The advantage of open-loop Rogowski coils is that they do not require direct contact with the circuit, making them suitable for safety detection in high-altitude, low-voltage circuits.

[0063] The ESP32 microcontroller serves as the core control unit, handling signal processing and data transmission. The ESP32 converts the analog current signal acquired by the Rogowski coil into a digital signal via an ADC interface for subsequent data analysis. After receiving the digital signal, the ESP32 runs a specific algorithm to analyze the signal characteristics and determine if a ground fault exists. The ESP32 then transmits the processed detection results to a mobile terminal on the ground via its built-in Wi-Fi module, enabling real-time remote data transmission.

[0064] The mobile terminal serves as both a data receiver and user interface, helping maintenance personnel view test results and make decisions. Connecting to the ESP32 via a mobile network, the mobile terminal receives real-time test data from the airborne portion. The application on the mobile terminal displays the test data in an intuitive format, allowing maintenance personnel to quickly view analysis results and fault information. This real-time data monitoring method significantly reduces fault location time, enabling maintenance personnel to quickly pinpoint grounding faults and improve fault handling efficiency. Simultaneously, the mobile terminal's visual interface allows users to clearly obtain test information, reducing operational complexity and facilitating rapid on-site judgment and response.

[0065] The ESP32 microcontroller is initialized each time it is powered on. Initialization includes hardware checks, clearing variables and registers, and configuring network module connections to ensure subsequent processes can run correctly. Then, the AC current on the grounding wire is collected via Rogowski coils and converted from analog to digital. The ESP32 microcontroller acquires the AC current detected by all Rogowski coils on the grounding wire at the same sampling time, performs analog-to-digital conversion on the AC current, obtains the voltage data corresponding to each Rogowski coil, and then integrates the voltage data corresponding to each Rogowski coil according to the sampling point order (i.e., the arrangement order of the Rogowski coils) to obtain a voltage data sequence.

[0066] For example, the ESP32 microcontroller uses a double averaging filter algorithm to filter the voltage data sequence to obtain an effective leakage current data sequence. To reduce noise interference in the current signal, the ESP32 microcontroller performs a double averaging filter on the read voltage data sequence. This filtering algorithm effectively smooths fluctuating data by averaging multiple measurements, thereby extracting more accurate current change information. The filtered data is more suitable for determining ground faults.

[0067] For example, suppose the Rogowski coil samples the input signal sequence as x[n], where n is the sampling point number. After the first moving average, the smoothed sequence is:

[0068]

[0069] After a second moving average, the smoothed sequence is obtained as follows:

[0070]

[0071] Where z[n] is the leakage current data sequence after double averaging filtering, n is the sampling point number, which is also the Rogowski coil number, M is the length of the sliding window, which is also the total number of sampling points, and x[n] is the voltage data of the nth sampling point.

[0072] By using two moving average filters, the algorithm can more effectively suppress high-frequency noise in the signal, keep the main components of the signal undistorted, preserve the characteristic information of the signal, and is suitable for periodic signal processing of AC power. It reduces the demand for hardware resources, improves the accuracy and precision of grounding fault detection, and effectively avoids misjudgment caused by noise interference.

[0073] In some embodiments of the invention, the Rogowski coil employs a closed-loop structure with an innovative clip-on design. This design allows the module to be easily secured to an electrical rail, enabling a quick and easy installation and removal process. This design significantly reduces the time and labor required for maintenance and inspection, especially when working at heights, simplifying procedures and improving work efficiency.

[0074] This embodiment employs a wavelet denoising filtering algorithm to filter the voltage data sequence, obtaining an effective leakage current data sequence. Specifically, the noisy voltage data sequence is first decomposed using wavelet decomposition to obtain wavelet coefficients at different levels. These coefficients contain the time-frequency information of the signal; the wavelet coefficients of the true signal are larger, while those of the noise are smaller. By selecting an appropriate threshold, larger coefficients can be retained, while smaller coefficients are set to zero, thereby achieving signal denoising.

[0075] Specifically:

[0076] 1. Wavelet decomposition.

[0077] Wavelet decomposition is performed on the noisy signal s(t) to obtain the wavelet coefficients W. S (a,b), where a is the scale used in wavelet decomposition and b is the displacement used in wavelet decomposition.

[0078] 2. Threshold processing.

[0079] Thresholding of wavelet coefficients commonly employs two methods: hard thresholding and soft thresholding. The mathematical expression for hard thresholding is:

[0080]

[0081] Wherein is the T threshold, which can be determined based on noise level or other criteria.

[0082] The soft threshold function expression is as follows:

[0083]

[0084] Where T is the threshold, |W a,b | represents the wavelet coefficients obtained by wavelet decomposition of the voltage data sequence S, where a is the scale used for wavelet decomposition and b is the displacement used for wavelet decomposition.

[0085] For a series of wavelet coefficients W s =[w1,w2,...,w n First, calculate the sum of squares S, then determine the threshold T based on the Stein unbiased estimate: Where σ is the standard deviation of the noise, which can be expressed as σ = median(|W s |) / 0.6745 is estimated. Assume W s If the sum of the given values ​​is [0.5, 1, 1.5, 2] and n = 4, then S = 0.5. 2 +1 2 +1.5 2 +2 2 =7.5, σ≈0.6745, so T≈1.155.

[0086] 3. Wavelet reconstruction.

[0087] Wavelet reconstruction is performed using the processed wavelet coefficients to obtain the denoised signal. Through this process, the wavelet denoising filtering algorithm can effectively reduce noise levels and improve the accuracy of leakage current detection. This method achieves better denoising results than other traditional methods such as mean filtering and median filtering when processing non-stationary signals, especially those containing abrupt changes or spikes, and can better restore the original signal.

[0088] Figure 2 This is a schematic diagram of a low-voltage line grounding fault detection device provided by the present invention. Multiple Rogowski coils are spaced apart on the grounding wire of the low-voltage line. The Rogowski coils are used for non-contact detection of the alternating current on the grounding wire, such as... Figure 2 As shown, the low-voltage line grounding fault detection device includes:

[0089] Data integration module 201 is used to perform analog-to-digital conversion and integration on the AC current detected by each Rogowski coil at the same acquisition time to obtain a voltage data sequence;

[0090] The filtering module 202 is used to filter the voltage data sequence using a filtering algorithm to obtain an effective leakage current data sequence;

[0091] Feature information extraction module 203 is used to extract feature information characterizing leakage fault from the leakage data sequence;

[0092] The fault location determination module 204 is used to determine the fault location of the low-voltage line as a grounding leakage fault based on the feature information.

[0093] The fault reporting module 205 is used to send the fault location to the mobile terminal of the operation and maintenance personnel.

[0094] In some embodiments of the present invention, the Rogowski coil adopts an open-loop structure, and the filtering module 202 includes:

[0095] The dual filtering submodule is used to filter the voltage data sequence using a dual averaging filtering algorithm to obtain an effective leakage current data sequence.

[0096] In some embodiments of the present invention, the double averaging filtering algorithm is as follows:

[0097]

[0098] Where z[n] is the leakage current data sequence after double averaging filtering, n is the sampling point number, which is also the Rogowski coil number, M is the length of the sliding window, which is also the total number of sampling points, and x[n] is the voltage data of the nth sampling point.

[0099] In some embodiments of the present invention, the Rogowski coil adopts a closed-loop structure, and the filtering module 202 includes:

[0100] The wavelet denoising submodule is used to filter the voltage data sequence using a wavelet denoising filtering algorithm to obtain an effective leakage current data sequence.

[0101] In some embodiments of the present invention, the wavelet denoising submodule includes:

[0102] The wavelet decomposition unit is used to perform wavelet decomposition on the voltage data sequence to obtain wavelet coefficients at multiple different levels.

[0103] A threshold processing unit is used to perform threshold processing on the multiple wavelet coefficients to retain valid wavelet coefficients.

[0104] The data reconstruction unit is used to reconstruct the effective wavelet coefficients to obtain an effective leakage current data sequence.

[0105] In some embodiments of the present invention, the threshold processing employs a hard threshold function, which is:

[0106]

[0107] Where T is the threshold, W s (a,b) are the wavelet coefficients obtained by wavelet decomposition of the voltage data sequence S, where a is the scale used for wavelet decomposition and b is the displacement used for wavelet decomposition.

[0108] In some embodiments of the present invention, the threshold processing employs a soft threshold function, which is:

[0109]

[0110] Where T is the threshold, |W a,b | represents the wavelet coefficients obtained by wavelet decomposition of the voltage data sequence S, where a is the scale used in wavelet decomposition and b is the displacement used in wavelet decomposition.

[0111] The aforementioned low-voltage line grounding fault detection device can execute the low-voltage line grounding fault detection method provided in the foregoing embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the low-voltage line grounding fault detection method.

[0112] Figure 3 This is a schematic diagram of an electronic device provided by the present invention. 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 electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0113] like Figure 3As shown, the electronic device includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer programs stored in the ROM 12 or loaded into the RAM 13 from storage unit 18. The RAM 13 can also store various programs and data required for the operation of the electronic device. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0114] Multiple components in the electronic device are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, optical disk, etc.; and a communication unit 19, such as a network card, modem, wireless transceiver, etc. The communication unit 19 allows the electronic device to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0115] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as low-voltage line grounding fault detection methods.

[0116] In some embodiments, the low-voltage line grounding fault detection method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on an electronic device via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the low-voltage line grounding fault detection method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the low-voltage line grounding fault detection method by any other suitable means (e.g., by means of firmware).

[0117] Various embodiments 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-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0118] Computer programs used to implement the methods of the present invention 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, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0119] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on 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 fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0120] To provide interaction with a user, the systems and techniques described herein can 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 pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0121] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0122] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0123] This invention also provides a computer program product, including a computer program that, when executed by a processor, implements the low-voltage line grounding fault detection method provided in any embodiment of this application.

[0124] In implementing the computer program product, computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0125] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0126] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand 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 this invention should be included within the scope of protection of this invention.

Claims

1. A method for detecting grounding faults in low-voltage lines, characterized in that, Multiple Rogowski coils are spaced apart on the grounding wire of the low-voltage line. The Rogowski coils are used for non-contact detection of the AC current on the grounding wire. The method includes: The AC current detected by each Rogowski coil at the same acquisition time is converted from analog to digital and integrated to obtain a voltage data sequence; wherein, the AC current detected by each Rogowski coil is converted from analog to digital to obtain the voltage data corresponding to each Rogowski coil, and then the voltage data corresponding to each Rogowski coil is integrated according to the arrangement order of the Rogowski coils to obtain a voltage data sequence. The voltage data sequence is filtered using a filtering algorithm to obtain an effective leakage current data sequence; The Rogowski coil employs an open-loop structure, and a filtering algorithm is used to filter the voltage data sequence to obtain an effective leakage current data sequence, including: The voltage data sequence is filtered using a double averaging filter algorithm to obtain an effective leakage current data sequence; or: The Rogowski coil employs a closed-loop structure. A filtering algorithm is used to filter the voltage data sequence to obtain an effective leakage current data sequence, including: The voltage data sequence is filtered using a wavelet denoising filtering algorithm to obtain an effective leakage current data sequence. Specifically, the voltage data sequence is decomposed using wavelet decomposition to obtain multiple wavelet coefficients at different levels. The multiple wavelet coefficients are then thresholded using a hard thresholding function or a soft thresholding function to retain the effective wavelet coefficients. Finally, the effective wavelet coefficients are reconstructed to obtain the effective leakage current data sequence. Extract feature information characterizing leakage faults from the leakage data sequence; Based on the aforementioned feature information, the location of the grounding leakage fault in the low-voltage line is determined; wherein, the feature information is the amplitude of the leakage voltage, and when the amplitude of the leakage voltage detected by one of the Rogowski coils is greater than a preset value, it is determined that there is a grounding leakage fault at the location of the Rogowski coil. The location of the fault is sent to the mobile terminal of the maintenance personnel.

2. A low-voltage line grounding fault detection device, used to perform the low-voltage line grounding fault detection method as described in claim 1, characterized in that, Multiple Rogowski coils are spaced apart on the grounding wire of the low-voltage line. These Rogowski coils are used for non-contact detection of the alternating current on the grounding wire. The device includes: The data integration module is used to perform analog-to-digital conversion and integrate the AC current detected by each Rogowski coil at the same acquisition time to obtain a voltage data sequence. Specifically, the AC current detected by each Rogowski coil is converted from analog to digital to obtain the voltage data corresponding to each Rogowski coil. Then, the voltage data corresponding to each Rogowski coil is integrated according to the arrangement order of the Rogowski coils to obtain a voltage data sequence. The filtering module is used to filter the voltage data sequence using a filtering algorithm to obtain an effective leakage current data sequence; The feature information extraction module is used to extract feature information characterizing leakage faults from the leakage data sequence; The fault location determination module is used to determine the fault location of the low-voltage line grounding leakage fault based on the feature information; wherein, the feature information is the amplitude of the leakage voltage, and when the amplitude of the leakage voltage detected by one of the Rogowski coils is greater than a preset value, it is determined that there is a grounding leakage fault at the location of the Rogowski coil. The fault reporting module is used to send the fault location to the mobile terminal of the operation and maintenance personnel.

3. An electronic device, characterized in that, include: One or more processors; Storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the low-voltage line grounding fault detection method as described in claim 1.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the low-voltage line grounding fault detection method as described in claim 1.

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