Electric leakage indication method and system for low-voltage distribution network

Abstract

The invention discloses an electric leakage indication method and system for a low-voltage distribution network, and relates to the technical field of low-voltage distribution network fault identification, and the method comprises the steps: installation of a leakage current monitoring device, and parameter collection; performing data analysis and fault judgment; and carrying out electric leakage early warning and fault positioning. According to the electric leakage indication method for the low-voltage distribution network, electric leakage faults in a TN-C system can be effectively detected by monitoring the current of the grounding loop, electric leakage fault points are analyzed and judged by installing the electric leakage monitoring devices on all the branch lines in a segmented mode, refined monitoring in the distribution network is achieved, and the reliability of the distribution network is improved. The electric leakage monitoring device is installed at a power grid and customer property right demarcation point, judgment of a customer side electric leakage fault is achieved, it is ensured that the electric leakage fault in the customer property right is recognized in time, and better effects are achieved in the aspects of safety of a power distribution system, electric leakage fault positioning accuracy and operation and maintenance efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage distribution network fault identification, and in particular to a leakage indication method and system for a low-voltage distribution network. Background Art

[0002] Leakage faults account for a high proportion of low-voltage distribution network faults. Especially with the promotion and application of new energy and distributed photovoltaics, the leakage current components of low-voltage distribution networks are more complex. Leakage faults can cause electric shock, fire accidents and power loss in the substation. There are still a large number of TN-C systems in my country's low-voltage distribution network, and the current leakage protection mainly adopts the principle of balancing the inflow and outflow currents for leakage current monitoring and protection. Due to the characteristics of the TN-C system PE line and N line combined into one PEN line, the inflow and outflow currents in the leakage protection device transformer are equal in magnitude and opposite in direction, and the magnetic fields cancel each other and cannot work, so the TN-C system cannot be equipped with a leakage protection device for leakage protection. Leakage faults can easily cause electric shock, fire and power loss in the substation. In addition, it is difficult for operation and maintenance personnel to find leakage points, and they need to check and analyze them section by section, which is time-consuming and laborious. Summary of the invention

[0003] In view of the above-mentioned problems, the present invention is proposed.

[0004] Therefore, the technical problem solved by the present invention is that the existing low-voltage distribution network leakage indication method cannot be equipped with a leakage protection device for leakage protection, it is difficult to locate the leakage point, the maintenance efficiency is low, and the power loss is high.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a leakage indication method for low-voltage distribution network, including the installation of leakage current monitoring device, parameter collection; data analysis and fault judgment; leakage warning and fault location.

[0006] As a preferred solution of the leakage indication method for low-voltage distribution network of the present invention, wherein: the installation of the leakage current monitoring device includes installing the leakage current monitoring device at the grounding end of the distribution transformer by adopting a ring buckle method;

[0007] Leakage monitoring devices are installed in sections on the branch lines of the low-voltage distribution network; each device independently monitors the current and voltage parameters in the connected branch line.

[0008] As a preferred solution of the leakage indication method for low-voltage distribution network of the present invention, wherein: the parameter acquisition includes a current acquisition module acquiring the current value in the phase line and the neutral line, recording the value change of the current, and comparing it with the predetermined operating value;

[0009] Collect the voltage values ​​of the phase line and the neutral line to the ground potential and detect the voltage changes in the line.

[0010] As a preferred solution of the leakage indication method for low-voltage distribution network described in the present invention, the data analysis and fault judgment include an on-site data operation module calculating the collected current and voltage data, analyzing the current difference between the phase line and the neutral line and the voltage change to the ground potential.

[0011] As a preferred solution of the leakage indication method for low-voltage distribution network of the present invention, wherein: the data analysis and fault judgment includes the system judging whether a leakage fault has occurred based on the data analysis result;

[0012] If the data difference exceeds the threshold, there is leakage.

[0013] As a preferred solution of the leakage indication method for low-voltage distribution network described in the present invention, wherein: the leakage warning and fault location include when the system confirms that there is a leakage fault, the warning is activated, and an audible and visual alarm is issued to remind the surrounding personnel and operation and maintenance personnel to pay attention to the leakage risk;

[0014] Based on the collected segment monitoring data, the system locates the line segment node where the leakage fault occurs, and points out the leakage point based on the changing characteristics of current and voltage.

[0015] As a preferred solution of the leakage indication method for low-voltage distribution network of the present invention, wherein: the leakage warning and fault location include that after the leakage warning is issued, the device reminds the operation and maintenance personnel to promptly repair the fault point through local and remote communication;

[0016] The system helps operation and maintenance personnel find and repair leakage problems.

[0017] Another object of the present invention is to provide a leakage indication system for low voltage distribution network, which can solve the problem of difficulty in locating leakage points in current leakage indication methods for low voltage distribution network by monitoring the grounding loop current.

[0018] As a preferred solution of the leakage indication system for low-voltage distribution network described in the present invention, it includes: a power supply module, a current acquisition module, a voltage acquisition module, an on-site data operation module, and an early warning module; the power supply module is used to provide power for the leakage monitoring and indicating device; the current acquisition module is used to collect the current values ​​of the phase line and the neutral line; the voltage acquisition module is used to collect the potential voltage values ​​of the phase line and the neutral line to the ground; the on-site data operation module is used to calculate and analyze the current difference characteristics of the phase line and the neutral line and the potential voltage change characteristics of the phase line and the neutral line to the ground, and judge the leakage fault; the early warning module is used to issue an audible and visual alarm for the leakage fault.

[0019] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement a method for indicating leakage of low-voltage distribution network.

[0020] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a leakage indication method for a low-voltage distribution network.

[0021] Beneficial effects of the present invention: The leakage indication method for low-voltage distribution network provided by the present invention can effectively detect leakage faults in the TN-C system by monitoring the grounding loop current. The leakage monitoring device is installed in sections on each branch line to analyze and determine the leakage fault point, thereby realizing refined monitoring in the distribution network. The leakage monitoring device is installed at the boundary between the power grid and the customer's property rights to realize the judgment of the leakage fault on the customer side and ensure the timely identification of the leakage fault within the user's property rights. The present invention achieves better results in terms of the safety of the distribution system, the accuracy of leakage fault location and the operation and maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use 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 ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 An overall flow chart of a leakage indication method for a low-voltage distribution network provided in the first embodiment of the present invention.

[0024] Figure 2 A control flow chart of a leakage fault monitoring and indicating device of a leakage indication method for a low-voltage distribution network provided in the first embodiment of the present invention.

[0025] Figure 3 The present invention provides an overall flow chart of a leakage indication system for a low-voltage distribution network according to a third embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0027] Example 1, reference Figure 1 = Figure 2, as an embodiment of the present invention, provides a leakage indication method for a low voltage distribution network, comprising:

[0028] S1: Installation of leakage current monitoring device and parameter collection.

[0029] Furthermore, a leakage current monitoring device is installed:

[0030] The leakage current monitoring device is installed at the grounding terminal of the distribution transformer by means of a ring clip, ensuring that the current value flowing through the ground loop and back to the neutral point of the distribution transformer can be monitored.

[0031] The main purpose of this step is to monitor the leakage in the electrical circuit, especially the leakage fault in the TN-C grounding system.

[0032] Install the segment monitoring device:

[0033] The leakage monitoring devices are installed in sections on the branch lines of the low-voltage distribution network. Each device independently monitors the current and voltage parameters in the connected branch line.

[0034] This step refines the leakage detection of different line sections through segmented installation, making it easier to accurately locate leakage faults.

[0035] Collect current parameters:

[0036] The current acquisition module collects the current values ​​in the phase line and the neutral line, records the value changes of these currents, and compares them with the predetermined normal operating values.

[0037] This operation helps to determine whether there is current abnormality in the circuit, thereby preliminarily judging the possibility of leakage fault.

[0038] Collect voltage parameters:

[0039] The voltage acquisition module collects the voltage values ​​of the phase line and the neutral line to the ground potential and detects abnormal changes in the voltage in the line.

[0040] The data from the voltage acquisition module is used in conjunction with the current acquisition module to help analyze leakage problems more comprehensively.

[0041] It should be noted that the installation method using the ring clip is feasible for practical operation. The ring clip can provide a convenient installation method to ensure that the equipment can be stably installed without affecting the original circuit structure, and is particularly suitable for existing low-voltage distribution networks. The structural design of the ring clip allows the device to be quickly fixed to the grounding terminal of the distribution transformer and maintain long-term stability. The ring clip is installed at the grounding terminal of the distribution transformer to effectively monitor the current value flowing through the ground loop and returning to the neutral point. In the TN-C grounding system, since the PE line and the N line are combined into the PEN line, it is difficult for traditional leakage protection devices to detect leakage current in the loop. The use of the ring clip can solve this problem, ensuring real-time monitoring of the leakage fault point without changing the circuit design, and reducing the safety risks caused by system leakage. Compared with the traditional wiring method, the ring clip simplifies the installation process and improves the convenience and practicality of the monitoring device.

[0042] Segmented installation refers to configuring monitoring devices section by section on different branch lines of the low-voltage distribution network, and independently monitoring the current and voltage parameters of each section of the line. This arrangement ensures distributed monitoring within the power grid. Segmented installation not only improves the accuracy of leakage monitoring, but also significantly shortens the time for fault location. There may be obvious regional differences in the current and voltage parameters of branch lines, and segmented installation can monitor the characteristics of each section of the line in real time. When a leakage occurs in a certain section of the line, the device can quickly locate the fault area. This method not only refines the dimensions of leakage detection, but also improves the flexibility of the system and the speed of fault diagnosis in large-scale power distribution systems. This precise segmented monitoring is rarely used in existing low-voltage power distribution systems and is an innovation of the present invention.

[0043] The current acquisition module is designed to monitor the current changes of the phase and neutral lines and compare them with the predetermined values ​​for normal operation. The current value is collected by recording the real-time current in the circuit through this module, so as to identify abnormal fluctuations in the current and preliminarily determine the possibility of leakage faults. The use of the current acquisition module is one of the cores of the leakage monitoring device. By collecting the current difference between the phase and neutral lines, it can accurately identify potential leakage problems. Abnormal current changes are often early signs of leakage. The current acquisition module can provide early warnings at the beginning of the problem to avoid more serious equipment damage or electric shock accidents. This precise collection and comparative analysis enables the monitoring device to have the ability of intelligent judgment, which greatly improves the detection efficiency of leakage faults, especially in complex power grid environments.

[0044] The voltage acquisition module collects the voltage value of the phase line and the neutral line to the ground potential, and works with the current acquisition module by detecting abnormal voltage changes in the line. This collaborative mechanism provides a more comprehensive perspective for circuit monitoring. Relying on the current acquisition module alone may not be able to fully determine the root cause of the leakage, especially in some fault situations where the current change is small. The voltage acquisition module compensates for this defect by monitoring the voltage change to the ground. When the current acquisition and voltage acquisition data are used together, the monitoring system can analyze the leakage fault in the line more comprehensively and accurately, not only detecting the fault, but also better diagnosing the cause of the fault. Through this integrated analysis method, the system has greatly improved the intelligence level of power grid operation and maintenance, ensuring that leakage problems can be discovered and handled in a timely manner.

[0045] S2: Analyze data and make fault diagnosis.

[0046] Further, data calculation and analysis:

[0047] The local data operation module calculates the collected current and voltage data, and analyzes the current difference between the phase line and the neutral line and the voltage change to the ground potential.

[0048] This analysis can help determine whether there is leakage and further refine the determination of which line segment has the problem.

[0049] Determine leakage fault:

[0050] Based on the data analysis results, the system determines whether a leakage fault has occurred. If the data difference exceeds the normal range, it will be confirmed that there is a leakage phenomenon.

[0051] This step provides the operation and maintenance personnel with a basis for deciding whether further inspection and maintenance are needed through the results of the analysis.

[0052] It should be noted that the local data operation module is a key component in the present invention, and its function is to calculate and analyze the current and voltage data collected in real time. The rationality of this module is reflected in its ability to process data immediately at the monitoring site, without the need to transmit it remotely to the central server for processing. Through this module, data delay can be reduced, and the monitoring results can be fed back more promptly. This is very important for leakage detection in the power system, especially when a fault occurs, making a quick judgment can prevent the further deterioration of the accident. By calculating and analyzing the current difference between the phase line and the neutral line and the voltage change to the ground potential, it can be accurately determined whether there is leakage in the power grid. This real-time data processing method is different from the solution that relies on remote calculation in the prior art, and can quickly evaluate the data and shorten the reaction time. The current difference between the phase line and the neutral line is often the direct basis for judging leakage, and the change in the voltage to the ground can be used as a reference indicator for the severity of leakage. This combined analysis can provide a more comprehensive basis for judgment, enabling the system to more accurately identify leakage faults.

[0053] To determine a leakage fault, the system determines whether a leakage fault has occurred based on the analysis results provided by the data calculation module. The pre-set normal range can effectively filter out unnecessary false alarms, ensuring that the alarm is triggered only when there is a real fault. This is a part that is easily overlooked in traditional detection systems, which usually only rely on simple current detection and are prone to false alarms due to short-term fluctuations. Through precise judgment logic, the system can not only identify leakage faults, but also further provide the line segment where the specific fault occurs. Unlike traditional global alarm systems, the present invention refines the fault location function. This segmented judgment method can not only help operation and maintenance personnel quickly determine the source of the fault and save troubleshooting time, but also avoid misjudgment caused by excessive range and reduce maintenance costs. Through this refined processing, operation and maintenance personnel can perform more targeted maintenance based on the analysis results, thereby improving the safety and operating efficiency of the overall system.

[0054] S3: Conduct leakage warning and fault location.

[0055] Furthermore, leakage warning and fault location

[0056] Leakage fault warning: When the system confirms that there is a leakage fault, the warning module will be activated and an audible and visual alarm will be issued to remind surrounding personnel and operation and maintenance personnel to pay attention to the risk of leakage.

[0057] This early warning function is critical to avoiding electric shock, fire accidents and other safety risks, and enables timely measures to be taken.

[0058] Fault point segmentation location: The system will accurately locate the line segment or node where the leakage fault occurs based on the collected segmentation monitoring data. Combined with the changing characteristics of current and voltage, the leakage point can be accurately pointed out.

[0059] This function greatly reduces the scope of fault point search for operation and maintenance personnel and improves the efficiency of fault handling.

[0060] Remind maintenance personnel: After the leakage warning is issued, the device reminds maintenance personnel to repair the fault point in time through local and remote communication. This function ensures that maintenance personnel can obtain fault information in time and take prompt action to reduce the risk of fault expansion.

[0061] Reduce risks and power loss: The system helps operation and maintenance personnel quickly discover and repair leakage problems, reducing the possibility of electric shock, fire and power loss caused by leakage. This is the key advantage of the entire system, which can effectively reduce the operation risk of low-voltage distribution networks.

[0062] It should be noted that the core function of the early warning module is to immediately activate the sound and light alarm system when the system confirms that there is a leakage fault. The rationality lies in that the sound and light alarm can provide intuitive reminders, ensuring that not only the operation and maintenance personnel can be informed in time, but also warn nearby personnel to stay away from dangerous areas. The triggering conditions of the early warning module are based on real-time monitoring and analysis of leakage data to ensure that it will only be activated when a confirmed leakage fault occurs, thereby avoiding false alarms. The beneficial effect of leakage fault early warning is mainly reflected in the ability to prevent possible safety accidents, such as electric shock or fire. The early warning module immediately issues sound and light alarms to remind surrounding personnel of possible dangers, allowing operation and maintenance personnel to respond quickly and take protective measures. Compared with the traditional fault alarm system, the sound and light combination mode of the early warning module enhances the warning effect, especially in a noisy environment, which can ensure the effective communication of the reminder and further improve the safety protection level of the power system.

[0063] Segmented positioning means that the system monitors the current and voltage changes of branch lines or nodes to accurately locate the specific location where the leakage occurs. Its rationality is reflected in the use of subtle changes in electrical parameters to narrow the scope of the fault and reduce the time for manual troubleshooting. This segmented monitoring mode relies on data fusion analysis of multiple monitoring points, which not only improves the accuracy of fault detection, but also ensures the effectiveness of rapid positioning. The innovation of segmented positioning is that through segmented data collection and analysis, the scope of fault point investigation is greatly reduced, avoiding the time-consuming and labor-intensive problem of manual inspection section by section in traditional methods. The combined analysis of current and voltage characteristics can accurately point out the leakage point, which not only improves the efficiency of fault handling, but also reduces the system downtime, thereby reducing the impact on the operation of the distribution system. Compared with the limitation of the prior art that it is difficult to accurately locate faults, the segmented positioning method of the present invention significantly optimizes the process of power fault troubleshooting.

[0064] Local and remote communication methods provide multi-channel information reminders for operation and maintenance personnel. The rationale is that immediate local reminders can help on-site personnel respond quickly, while remote reminders promptly notify remote operation and maintenance teams through network communications to ensure comprehensive information transmission. This mechanism design fully considers the response needs in different scenarios and ensures the reliability and timeliness of information transmission. Through the combination of local and remote communications, operation and maintenance personnel can receive fault information in a timely manner and take quick action no matter where they are. This design effectively reduces the repair time lag caused by information delays and further reduces the risk of fault expansion. Compared with the traditional method of relying solely on on-site alarms, this multi-channel reminder mechanism enhances the coverage of information and ensures that leakage faults can be handled in the shortest time.

[0065] Reducing risks and power losses is the ultimate effect of the system and one of the main goals of the design. The rationality lies in that through timely fault warning and accurate fault point location, the system can effectively repair the leakage problem before it expands, avoiding potential serious safety hazards and economic losses. The system helps operation and maintenance personnel quickly discover and repair leakage problems, which can not only reduce the risk of electric shock or fire, but also reduce the power loss caused by long-term leakage. This is especially critical for low-voltage distribution networks. If leakage faults are not handled in time, it will not only increase system energy consumption, but also cause safety hazards and even affect the power supply stability of the entire area. Through real-time detection and timely repair, the system significantly reduces operating costs and safety risks while improving the reliability of distribution network operation.

[0066] Embodiment 2, an embodiment of the present invention, provides a leakage indication method for a low-voltage distribution network. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0067] First of all, the goal of this experiment is to verify the actual application effect of a leakage monitoring device for low-voltage distribution networks. The device quickly and accurately detects leakage current faults by monitoring current and voltage changes, and locates the fault point in sections. The experiment was conducted in an actual low-voltage distribution network environment, and the leakage detection, alarm response and positioning accuracy at different locations were tested.

[0068] The test steps are as follows:

[0069] Installation of monitoring devices: The leakage monitoring devices are installed at four key locations in the experimental area, namely the grounding terminal of the distribution transformer, the branch lines of the low-voltage distribution network (A, B, C, D), and the boundary between the power grid and the customer's property rights. Each location is installed using a ring buckle method to ensure that the device does not affect the normal operation of the line, and can monitor current, voltage and other parameters in real time.

[0070] Current and voltage monitoring: After the device is started, the current and voltage data of each line segment are collected through the current acquisition module and the voltage acquisition module. The specific monitored data include the current difference between the phase line and the neutral line, and the voltage change to the ground potential. During the detection process, the current value of the grounding terminal of the distribution transformer is set to 0.03A, while the current value of the branch line ranges from 1.3A to 1.7A.

[0071] Fault detection and alarm: When the monitoring system detects that the current or voltage deviation of certain lines exceeds the set threshold (such as leakage current greater than 0.03A or voltage difference greater than 2V), the early warning module will activate the sound and light alarm to remind the on-site operation and maintenance personnel. The system will make a judgment based on the abnormal changes in current and voltage based on real-time data analysis and whether to trigger an alarm.

[0072] Fault location and communication: In the experiment, when the device detects leakage (such as at Line B and Line D), the local data operation module performs real-time data processing to determine the specific location of the leakage fault. For lines with leakage, the system notifies the operation and maintenance team through local and remote communication to ensure that the fault information is communicated in a timely manner.

[0073] Experimental records and analysis: The experiment focuses on monitoring the current and voltage changes of each line, the response time of fault detection, and the accuracy of fault location. The experimental data is recorded in a table, including the current, leakage detection, alarm response time, and the accuracy of fault location.

[0074] Table 1 Experimental data table

[0075]

[0076] The experimental data table shows the current, voltage value, leakage detection status, reaction time, positioning accuracy and whether the alarm is triggered for each test object. The following conclusions can be drawn through analysis:

[0077] Leakage detection accuracy: During the experiment, the leakage monitoring device can accurately detect the leakage of the ground terminal of the distribution transformer and branch lines B and D. When the leakage current is low (such as 0.03A), the system can still accurately trigger the alarm, which shows that the leakage detection sensitivity of the present invention is very high. Compared with traditional equipment that can only detect leakage problems under larger currents, the innovation of the present invention lies in the ability to detect weak leakage, which significantly improves the safety of the distribution network.

[0078] Reaction time: As can be seen from the table, the response time of the leakage alarm is maintained between 0.5 and 0.8 seconds, which is a fast response. This means that the system can identify leakage and issue an early warning in a short time, reducing the risk of safety accidents caused by leakage faults. Compared with existing technologies, traditional equipment may take several seconds or minutes to trigger an alarm, and this system significantly shortens the fault response time.

[0079] Fault location accuracy: Data shows that the location accuracy of the leakage fault point is between 94% and 100%, indicating that the segmented location function of the present invention has high-precision fault identification capabilities. Compared with the manual segment-by-segment troubleshooting method in the prior art, the present invention can quickly and accurately locate faults by combining current and voltage data, greatly improving operation and maintenance efficiency.

[0080] Alarm triggering and communication function: When a leakage fault occurs, the system can trigger an alarm in time and remind the operation and maintenance personnel through local and remote communications. During the experiment, when the B line and D line leaked electricity, the system notified the operation and maintenance team through sound and light alarms and remote communication to ensure timely action. This function significantly reduces the delay of information transmission and improves the timeliness of fault handling, reflecting the advantages of the system in safety management.

[0081] In summary, the present embodiment verifies the innovation and advantages of the invention through experimental data. In terms of the sensitivity of leakage detection, the accuracy of fault location and the response speed of the early warning system, the present invention is superior to the traditional leakage monitoring equipment, especially in the TN-C grounding type low-voltage distribution network, and can provide more reliable leakage protection and more efficient fault detection.

[0082] Example 3, reference Figure 3 , which is an embodiment of the present invention, provides a leakage indication system for a low-voltage distribution network, including a power supply module, a current acquisition module, a voltage acquisition module, an on-site data calculation module, and an early warning module.

[0083] The power supply module is used to provide power for the leakage monitoring and indicating device, the current acquisition module is used to collect the current values ​​of the phase line and the neutral line, the voltage acquisition module is used to collect the potential voltage values ​​of the phase line and the neutral line to the ground, the local data calculation module is used to calculate and analyze the current difference characteristics of the phase line and the neutral line and the potential voltage change characteristics of the phase line and the neutral line to the ground, and judge the leakage fault. The early warning module is used to issue an audible and visual alarm for the leakage fault.

[0084] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0085] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0086] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0087] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limited. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

[0088] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A leakage indication method for low voltage distribution network, characterized in that: include: Installation of leakage current monitoring device and parameter collection; Analyze data and make fault diagnosis; Conduct leakage warning and fault location.

2. The method for indicating leakage in a low voltage distribution network according to claim 1, characterized in that: The installation of the leakage current monitoring device includes installing the leakage current monitoring device on the grounding terminal of the distribution transformer by adopting a ring-shaped buckle method; Leakage monitoring devices are installed in sections on the branch lines of the low-voltage distribution network; each device independently monitors the current and voltage parameters in the connected branch line.

3. The method for indicating leakage of low voltage distribution network according to claim 2, characterized in that: The parameter acquisition includes a current acquisition module acquiring current values ​​in the phase line and the neutral line, recording the value change of the current, and comparing it with the predetermined operating value; Collect the voltage values ​​of the phase line and the neutral line to the ground potential and detect the voltage changes in the line.

4. The method for indicating leakage in a low voltage distribution network according to claim 3, characterized in that: The data analysis and fault judgment includes the on-site data operation module calculating the collected current and voltage data, analyzing the current difference between the phase line and the neutral line and the voltage change to the ground potential.

5. The method for indicating leakage in a low voltage distribution network according to claim 4, characterized in that: The data analysis and fault judgment includes the system judging whether a leakage fault has occurred based on the data analysis result; If the data difference exceeds the threshold, there is leakage.

6. The method for indicating leakage in a low voltage distribution network according to claim 5, characterized in that: The leakage warning and fault location includes starting the warning when the system confirms that there is a leakage fault, issuing an audible and visual alarm, and reminding the surrounding personnel and operation and maintenance personnel to pay attention to the leakage risk; Based on the collected segment monitoring data, the system locates the line segment node where the leakage fault occurs, and points out the leakage point based on the changing characteristics of current and voltage.

7. The method for indicating leakage in a low voltage distribution network according to claim 6, characterized in that: The leakage warning and fault location include that after the leakage warning is issued, the device reminds the operation and maintenance personnel to promptly repair the fault point through local and remote communication; The system helps operation and maintenance personnel find and repair leakage problems.

8. A system using the low voltage distribution network leakage indication method as claimed in any one of claims 1 to 7, characterized in that: It includes power supply module, current acquisition module, voltage acquisition module, local data operation module and early warning module; The power supply module is used to provide power to the leakage monitoring indicating device; The current acquisition module is used to collect the current values ​​of the phase line and the neutral line; The voltage acquisition module is used to collect the voltage values ​​of the phase line and the neutral line to the ground potential; The local data operation module is used to calculate and analyze the current difference characteristics of the phase line and the neutral line and the voltage change characteristics of the phase line and the neutral line to the ground potential, and determine the leakage fault; The early warning module is used to issue an audible and visual alarm for leakage faults.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the leakage indication method for a low-voltage distribution network according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the leakage indication method for a low-voltage distribution network according to any one of claims 1 to 7 are implemented.

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