Municipal lighting street lamp electric leakage monitoring and positioning system
The municipal lighting street light leakage monitoring system, which utilizes LoRa wireless self-organizing network and Beidou positioning module, combined with residual current monitoring module and quick-plug terminal block, solves the problems of communication stability, cost and positioning accuracy in municipal lighting street light leakage detection. It achieves high reliability, low cost and accurate positioning, and improves the intelligent management level of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 连云港市市政公用事业发展中心
- Filing Date
- 2026-01-28
- Publication Date
- 2026-04-28
AI Technical Summary
Existing leakage current detection technologies for municipal lighting streetlights suffer from problems such as poor communication stability, high cost, limited positioning accuracy, and complex construction, making it difficult to achieve high reliability, low cost, and accurate positioning in leakage current detection, and also resulting in power waste.
The street light leakage current monitoring system adopts LoRa wireless self-organizing network technology, Beidou positioning module and modular design, combined with residual current monitoring module and quick plug-in terminal block, to achieve high-precision leakage current location and remote control, reducing communication costs and installation complexity.
It achieves high-precision leakage current location, reduces communication costs and installation time, improves system reliability and security, reduces maintenance costs and power waste, and enhances the level of intelligence in municipal lighting management.
Smart Images
Figure CN121933976A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of municipal lighting public utility application technology, and in particular to a municipal lighting street light leakage monitoring and location system. Background Technology
[0002] Street light leakage refers to the phenomenon where current in the street light electrical system does not flow along the designed normal circuit, but leaks through unexpected paths (such as the light pole, damp medium, ground, etc.). Essentially, it is a grounding fault caused by insulation failure or wiring / protection defects. It can easily make the light pole live, causing electric shock and tripping. The risk is extremely high when there is water accumulation in rainy weather.
[0003] As shown in Figure 1, the power supply for lighting on urban main roads typically uses a three-phase five-wire power supply system with AC 380V, and the streetlights draw 220V from the main cable. In actual operation, leakage may occur due to various environmental factors, which could easily endanger personal safety. If a problem occurs and manual detection and location are difficult, resulting in untimely maintenance of the streetlights, it may cause adverse social impacts.
[0004] The occurrence of electric shock incidents caused by streetlight leakage has prompted research into related technologies to address similar problems. In 2022, the journal *Modern Information Technology* published a paper titled "A Solution for Electric Shock Injuries Caused by Streetlight Leakage Based on a 'Light Network' Smart Streetlight Management System." This solution utilizes a "Light Network" smart streetlight management system based on broadband power line carrier communication technology to achieve intelligent management of urban streetlight lighting systems. However, power line carrier communication technology is susceptible to power grid fluctuations and leakage interference, has a limited number of streetlights that can be connected at once, and is costly and difficult to promote widely.
[0005] Currently, leakage current detection technology for municipal streetlights mainly relies on a combination of power line carrier communication (PLC) technology and Internet of Things (IoT) sensors. For example, existing technologies include smart streetlight management systems based on the "Internet of Lights," which monitor abnormal conditions such as leakage and water accumulation through individual lamp control, circuit breaker control, and sensing technology. However, such systems have the following significant drawbacks:
[0006] Poor communication stability: Power line carrier communication is susceptible to power grid harmonics, load changes and electromagnetic interference, which leads to signal attenuation and increased bit error rate, especially in long-distance and multi-node scenarios where communication reliability is insufficient.
[0007] High cost: The system requires the deployment of a carrier communication module or 4G / 5G module at each street light node, resulting in high hardware and communication costs, making it difficult to promote and apply in large-scale municipal projects;
[0008] Limited positioning accuracy: Existing systems are mostly focused on leakage current alarms, lacking the ability to accurately locate leakage points, resulting in time-consuming and labor-intensive troubleshooting.
[0009] During construction, the wiring joints of light poles often use the traditional wrapping method, which is complex to install and maintain. Figure 2 As shown, this demonstrates the application of the traditional splicing method at the Shajing wiring site. The traditional splicing method has two main problems: firstly, it is labor-intensive and time-consuming, resulting in low construction efficiency; secondly, the joints are easily damaged, susceptible to moisture, oxidation, and overheating, leading to a greater risk of leakage and increased difficulty in subsequent maintenance.
[0010] In addition, in some sections of the road, there are few people and vehicles at night, yet all the streetlights are still on, resulting in some waste of electricity.
[0011] Therefore, there is an urgent need for a street light leakage current monitoring system that is highly reliable, low-cost, has accurate positioning capabilities, and is easy to deploy, in order to improve the safety and intelligent management level of municipal lighting systems. Summary of the Invention
[0012] The purpose of this invention is to provide a municipal lighting street light leakage monitoring and positioning system, which features high reliability, low cost, accurate positioning capability, and easy deployment.
[0013] The above-mentioned technical objective of the present invention is achieved through the following technical solution:
[0014] A municipal street light leakage monitoring and location system, characterized in that it includes: a municipal street light public service platform, a distribution box gateway, and a street light leakage monitoring terminal;
[0015] The municipal street light public service platform is used to display the leakage status and location information of the main cable, the working status of the street light, and to push abnormal alarms and maintenance information.
[0016] The distribution box gateway includes a main processing module, a LoRa communication module, a 4G / 5G network communication module, a Beidou positioning module, and a power supply module. The distribution box gateway communicates with the municipal street light public management platform via wireless 4G / 5G public network and with the street light leakage monitoring terminal via wireless sensor network.
[0017] The street light leakage current monitoring terminal includes a main processing module, a LoRa communication module, and a residual current monitoring module. The residual current monitoring module includes a residual current transformer and is connected to the main cable to monitor the residual current of the main cable.
[0018] The system compares the residual current data reported by each street light leakage monitoring terminal to identify the section between the residual current monitoring module with abnormal residual current and the residual current monitoring module with normal residual current on the power supply line, and determines the section as the leakage section; the Beidou positioning module of the distribution box gateway is used to provide the geographical location reference information of the gateway.
[0019] Preferably, when there are multiple leakage sections in the circuit, the system calculates the difference in residual current between adjacent residual current monitoring modules for residual current monitoring modules with abnormal residual current. When the difference in residual current is greater than a preset value, the section between the two residual current monitoring modules is determined to be a leakage section.
[0020] Preferably, the street light leakage current monitoring terminal also includes a street light current and voltage monitoring module, a lamp control module, a temperature sensor, and a water immersion sensor. The street light current and voltage monitoring module includes a residual current transformer and is connected to the branch cable of a single street light to monitor the operating current and operating voltage of a single street light.
[0021] As a preferred option, the modules and sensors of the street light leakage current monitoring terminal are connected using quick-plug terminal blocks.
[0022] As a preferred option, it also includes a cloud server. The distribution box gateway is connected to the cloud server via a 4G / 5G network communication module, and the cloud server is connected to the municipal street light public management platform network.
[0023] As an alternative, the cloud server can also connect to other terminals, including mobile phones, tablets, and management computers.
[0024] Preferably, the street light leakage current monitoring terminal is installed at the wiring point below the light pole or in the street light well.
[0025] A method for monitoring and locating leakage current in municipal streetlights, applied to the system described in any one of claims 1-7, characterized by comprising the following steps:
[0026] S1: Each street light leakage monitoring terminal is set up in the same location as the street light to collect data in real time on the operating current, operating voltage, temperature, water immersion status, and residual current of the main cable at the street light.
[0027] S2: Each street light leakage current monitoring terminal sends the data collected in S1 to its respective distribution box gateway through the LoRa communication module;
[0028] S3: The distribution box gateway sends the data collected by multiple street light leakage monitoring terminals to the municipal street light public service platform through the 4G / 5G network communication module;
[0029] S4: The platform or gateway compares and analyzes the residual current data received from each street light leakage monitoring terminal. When the residual current value of the main cable is greater than the preset value, it determines that there is a leakage point in the line and identifies the adjacent street light leakage monitoring terminals with abnormal residual current and those with normal residual current on the line.
[0030] S5: Based on the identification results of S4, determine that the leakage point is located in the line section between the adjacent street light leakage monitoring terminals;
[0031] S6: Obtain the location information of the distribution box gateway through the Beidou positioning module, determine the location information of the street light group connected to the distribution box gateway, confirm the location information of the leakage section through the street light numbers at both ends of the leakage section, display the data including the location information of the leakage section on the municipal street light public service platform, and issue an alarm message.
[0032] Preferably, when there are multiple leakage sections in the line, the difference in residual current between adjacent street light leakage monitoring terminals with abnormal residual current is calculated. When the difference in residual current is greater than a preset value, the adjacent street light leakage monitoring terminals are determined to be leakage sections.
[0033] A method for monitoring and locating leakage current in municipal streetlights, applied to the system as described in any one of claims 1-7, characterized in that a remote control lighting module is used to enable the streetlights to be lit intermittently.
[0034] In summary, the present invention has the following beneficial effects:
[0035] (1) Achieve precise leakage current location:
[0036] By deploying a residual current monitoring module at each street light and combining it with the principle of current nodes, the system can determine in real time the specific section where leakage occurs between adjacent normal and abnormal street lights. At the same time, by calculating the difference in residual current between adjacent abnormal nodes, other leakage sections can be identified. The positioning accuracy can reach the level of a single light. It is expected to reduce the on-site inspection time of maintenance personnel by more than 60%, and significantly shorten the fault diagnosis time.
[0037] (2) Reduce communication costs and power consumption:
[0038] Using LoRa wireless self-organizing network technology to replace power line carrier or 4G communication, the communication distance in urban environments can reach 1-3km, the terminal standby current is <10mA, and it has advantages such as long distance, low power consumption, and high anti-interference. The cost of a single node communication module is reduced by about 40%, and there is no need to pay for continuous traffic.
[0039] (3) Improve installation and maintenance efficiency:
[0040] The terminal adopts a modular design and supports quick-plug terminal blocks, replacing the traditional winding wiring method, reducing installation time by about 50%, and reducing the failure rate caused by loose connectors and corrosion.
[0041] (4) Enhance system reliability and security:
[0042] The terminal integrates temperature and water immersion sensors, supporting over-temperature and water ingress warnings; it adopts an optocoupler isolation design to avoid interference from high-voltage circuits to low-voltage circuits, improving the system's stability in harsh environments.
[0043] (5) Supports energy-saving control strategies:
[0044] By remotely controlling individual lamp switches, energy-saving modes such as "lighting up alternately" can be achieved, saving approximately 30%–50% of electricity during low-traffic periods and extending the lifespan of lamps.
[0045] (6) Significant economic benefits:
[0046] Reduced initial investment: Compared to traditional PLC or 4G solutions, the overall hardware cost of the system is expected to decrease by 25%–35%;
[0047] Reduced maintenance costs: The precise positioning function can reduce the frequency of manual inspections, and the annual maintenance cost is expected to be reduced by more than 20%;
[0048] Energy saving: Intelligent dimming and lamp isolation control strategies can achieve annual energy savings of approximately 15%–30%;
[0049] Social benefits: Improve public safety, reduce electric shock accidents, and enhance the image of municipal management. Attached Figure Description
[0050] Figure 1 This is a schematic diagram of a standard municipal street lighting circuit;
[0051] Figure 2 This is a schematic diagram of the connection site in Shajing;
[0052] Figure 3 It is a schematic diagram of the principle of circuit current;
[0053] Figure 4 This is a schematic diagram of the monitoring and positioning principle of this system;
[0054] Figure 5 This is a schematic diagram of the system architecture;
[0055] Figure 6 This is a schematic diagram of the network architecture of this system;
[0056] Figure 7 This is a block diagram of the distribution box and gateway components in this system;
[0057] Figure 8 This is a block diagram of the street light leakage current monitoring terminal in this system;
[0058] Figure 9 This is a schematic diagram showing the installation positions of each module in this system on the physical light pole;
[0059] Figure 10 This is a hardware resource allocation diagram for the street light leakage current control terminal in this system;
[0060] Figure 11 This is the circuit diagram of the power module for the street light leakage current control terminal;
[0061] Figure 12 This is the circuit diagram of the main processing module of the street light leakage current control terminal;
[0062] Figure 13 This is the circuit diagram of the LoRa communication module of the street light leakage current control terminal;
[0063] Figure 14 This is the residual current monitoring circuit diagram for the street light leakage current control terminal;
[0064] Figure 15 This is a circuit diagram for monitoring the operating current and voltage of streetlights in a streetlight leakage current control terminal.
[0065] Figure 16 This is the street light control circuit diagram of the street light leakage current control terminal;
[0066] Figure 17 This is the temperature monitoring circuit diagram for the street light leakage current control terminal;
[0067] Figure 18 This is a circuit diagram for the water immersion detection of a street light leakage current control terminal;
[0068] Figure 19 This is the circuit diagram of the DIP switch for the street light leakage current control terminal;
[0069] Figure 20 This is the signal optical isolation circuit diagram for the street light leakage current control terminal;
[0070] Figure 21 This is a software composition block diagram of the system;
[0071] Figure 22 It is a display interface of server software;
[0072] Figure 23 It is another display interface for server software. Detailed Implementation
[0073] The present invention will be further described in detail below with reference to the accompanying drawings.
[0074] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.
[0075] The principle of main cable leakage monitoring and location in this system is as follows.
[0076] The basic principle of circuit current is as follows Figure 3 As shown, the current at node i is equal to the sum of the currents at all subsequent nodes, and the sum of the positive current flowing out of node i and the negative current flowing into node i is 0.
[0077]
[0078] Based on the above principle, residual current transformers are used to install leakage current monitoring points on the main cable at each street light. For example... Figure 4 As shown, monitoring points are marked from left to right. If a leakage occurs at a certain point in the cable, all residual current transformers to the left of the leakage point will generate induced currents greater than 0. It can be determined that there is a leakage between the first residual current transformer with abnormal induction to the left of the leakage point and the first residual current transformer with normal induction to its right. The leakage point can be determined to be between these two residual current transformers. The location of the leakage point is completed based on the position of these two residual current transformers.
[0079] When there are multiple leakage points in the circuit. V i+1 = V i+2 = … = 0, these points have no leakage current. Based on the above principle, V can first be determined. i and V i+1 There is a leakage current phenomenon, and V i V i-1 V i-2 Both the node to its left and the node to its right may have leakage current. By calculating the difference between adjacent nodes, it can be determined whether there is a real leakage current. For example: if V i-2 - V i-1 If the value is greater than 0, then there is leakage between these two points.
[0080] For leakage current monitoring of individual streetlights, the leakage current status of the streetlight can be directly obtained by installing a residual current transformer on the branch cable of the streetlight.
[0081] The system architecture of this municipal street lighting leakage monitoring and location system is as follows: Figure 5 As shown, it mainly consists of three parts: municipal street light public management platform, distribution box gateway, and street light leakage monitoring terminal.
[0082] The municipal street light public service platform is used to display the leakage status and location information of the main cable, the working status of the street light, and to push abnormal alarms and maintenance information.
[0083] like Figure 6As shown, the system network adopts a two-level architecture. The street light leakage current monitoring terminal and the distribution box gateway communicate via a wireless sensor network (Lora technology), while the distribution box gateway and the municipal street light public management platform communicate via a wireless 4G public network. In one embodiment of this invention, wireless 5G public network communication can also be used. Wherein:
[0084] (1) The distribution box gateway and the public network use the TCP / IP protocol and a custom data packet transmission protocol;
[0085] (2) The distribution box gateway and the street light leakage monitoring terminal adopt the LoRa networking communication protocol and the ModBus-RTU data transmission protocol.
[0086] The system design of this system is divided into two parts: hardware design and software design.
[0087] The hardware design includes the design of the power distribution box gateway and the design of the street light leakage monitoring terminal.
[0088] like Figure 7 As shown, the distribution box gateway consists of a main processing module, a LoRa communication module, a 4G network communication module, a Beidou positioning module, and a power supply module. Its main functions include LoRa networking, periodically collecting street light monitoring data, and data forwarding. Specifically:
[0089] (1) The LoRa communication module is used to realize the networking between the distribution box gateway and the street light leakage monitoring terminal;
[0090] (2) The 4G network communication module is used to realize data forwarding between the LoRa network and the mobile public network;
[0091] (3) The Beidou positioning module is used to provide the location information of the distribution box gateway.
[0092] like Figure 8 As shown, the street light leakage current monitoring terminal consists of a main processing module, a LoRa communication module, a residual current monitoring module, a street light current and voltage monitoring module, a light control module, a temperature sensor, and a water immersion sensor. Both the residual current monitoring module and the street light current and voltage monitoring module include residual current transformers. The residual current monitoring module primarily monitors the residual current of the underground main cable, while the street light current and voltage monitoring module primarily monitors the residual current of the street light, as well as the lamp's operating current and voltage parameters, operating temperature, and external water immersion. It also transmits data with the distribution box gateway via LoRa networking.
[0093] like Figure 9As shown, the modules of the street light leakage current monitoring terminal in this system are installed at the wiring points below the light pole. In one embodiment of the invention, the modules can also be installed in the street light well. Therefore, the location of the street light represents the location of the street light leakage current monitoring terminal. Each street light has a street light number, and multiple street lights form a street light group. The street light leakage current monitoring terminal of each street light group is connected to the same distribution box gateway. Therefore, each residual current monitoring module corresponds to a street light number. The location of each street light leakage current monitoring terminal and street light is fixed, and its geographical location information is preset in the municipal street light public management platform. With the above network architecture, the municipal street light public management platform obtains the main cable residual current data and the working status of the street lights reported by each street light leakage current monitoring terminal in real time.
[0094] When a leakage occurs in the main cable, and the leakage section needs to be located, the municipal street light public management platform identifies the leakage section based on the aforementioned principle and sends out its geographical location information. This geographical location information includes the geographical location information of the distribution box gateway and the street light numbers at both ends of the leakage section. Since the street light group is connected to the distribution box gateway, the geographical location information of the distribution box gateway can determine the geographical location information of the street light group, thus determining the approximate location of the leakage section. Because the geographical location information of the street lights is preset in the municipal street light public management platform, and the location of the street lights reflects the location of the street light leakage monitoring terminal, by sending the street light numbers at both ends of the leakage section, the geographical location information of the street lights can reflect the geographical location information of the leakage section, thereby determining the geographical location information of the leakage section.
[0095] When a street light experiences abnormal conditions such as leakage, abnormal current or voltage, or water immersion, the municipal street light public management platform identifies the abnormal street light and sends its geographical location information, including the geographical location information of the distribution box gateway and the abnormal street light number.
[0096] like Figure 10 As shown, Figure 10 This is a hardware resource allocation diagram for the street light leakage current monitoring terminal in this system. The terminal uses an 8-bit DIP switch with an encoding range of 1-255.
[0097] like Figure 10 and Figure 11 As shown, the power supply module adopts an AC-DC module, with an input of 220V AC and an output of 12V and 3.3V isolated DC voltage. The DC-DC module generates a 3.3V isolated DC voltage.
[0098] like Figure 10 and Figure 12 As shown, the main processing module uses an STM32F103C8T6 microcontroller based on the Cortex-M3 core, and uses interfaces such as GPIO, UART, and SPI to communicate and control with peripheral circuits.
[0099] like Figure 10 and Figure 13 As shown, the LoRa communication module adopts the Ankexin Ra-01SCH-P module design, and communicates commands and data with the main processing module through the SPI interface.
[0100] like Figure 10 and Figure 14 As shown, the residual current monitoring module adopts the Shanghai Belling BL0942 metering chip design and transmits data with the main processor USART3 through an optically isolated serial port.
[0101] like Figure 10 and Figure 15 As shown, the street light operating current and voltage monitoring module adopts the Shanghai Belling BL0942 metering chip design, and transmits data with the main processor USART2 through an optically isolated serial port.
[0102] like Figure 10 and Figure 16 As shown, the lighting control module uses optical isolation to isolate the main processing module from the relay module, thus avoiding interference. By programming the GPIO pins of the main processing module, the switching of the relay is controlled, thereby controlling the power supply of the lamp.
[0103] like Figure 10 and Figure 17 As shown, the temperature monitoring module is used to monitor the internal operating temperature of the terminal. It is designed with a DS18B20 sensor. The DAT signal of the sensor is connected to the GPIO of the main processing module, and data is transmitted via a 1-Wire bus.
[0104] like Figure 10 and Figure 18 As shown, the water immersion detection module uses an optical isolator to isolate the water immersion sensor signal from the GPIO signal of the main processing module to prevent external interference.
[0105] like Figure 10 and Figure 19 As shown, the terminal number DIP switch is connected to the GPIO pin of the main processing module using an 8-bit DIP switch. By reading the high and low levels (1 / 0) of the main processing module pins, 256 different IDs can be combined to distinguish different street light monitoring terminals.
[0106] like Figure 10 and Figure 20 As shown, the signal optical isolation module uses optical isolation devices to isolate signals of different voltages, and the signals TX2, RX2, TX3, and RX3 communicate with the metering module via serial port.
[0107] The software design of this system is as follows: Figure 21As shown, it consists of four parts: street light leakage monitoring terminal software, distribution box gateway software, cloud platform server software, and APP application software (including mobile APP and computer APP).
[0108] Street light leakage current monitoring software is used to monitor the operating electrical parameters of street lights and the residual current of cables. According to the commands of the distribution box, it sends street light information to the distribution box and controls the power switch of the lights.
[0109] The distribution box gateway software uses LoRa networking technology to receive information sent by the street light leakage monitoring terminal software, process and locate the leakage line segment, and send data to the municipal street light public management platform.
[0110] (1) Hardware environment
[0111] Main processor: STM32F103C8T6
[0112] Streetlight communication: Ankexin LoRa module
[0113] Server communication: Mobile public network 4G module
[0114] (2) Software environment
[0115] Programming language: C
[0116] Development environment: Keil
[0117] Communication protocol: A custom protocol in the following format.
[0118] The distribution box gateway terminal transmits message formats to the server.
[0119] Distribution box number Light number x Lamp x Current Lamp x Voltage Lamp x Residual Current Lamp x Temperature Light x Water Level CRC16 4 1 3 3 3 2 1 2
[0120] The server sends data to the distribution box gateway terminal.
[0121] Distribution box number Light number x Light X Operation CRC16 4 1 1 2
[0122] Among them: Light x operation: 0 monitors the main processing module to be off, 1 to be on.
[0123] The server software uses a B / S or C / S architecture to view and display the street light status. If an anomaly occurs, it sends the location information of the leaking wire segment to maintenance personnel. Main software functions:
[0124] (1) Access Control: Administrators, Maintenance Personnel, and General Personnel;
[0125] (2) System settings: leakage current threshold, device number, location information, alarm information, etc.;
[0126] (3) Map guidance: View the real-time status of streetlights (current, voltage, leakage current) and leakage alarm;
[0127] (4) Information push: The alarm is simultaneously pushed to the management and maintenance personnel.
[0128] like Figure 22 As shown, the client displays the specific location and status of the streetlights on the map. When the residual current is 0mA, a green dot indicates normal operation; when the residual current is below 20mA, a yellow dot indicates a warning; and when the residual current is greater than or equal to 20mA, a red dot indicates leakage.
[0129] like Figure 23 As shown, the client displays detailed information about streetlights in the real-world street view, such as street name, distribution box number, light pole number, operating current, operating voltage, leakage current, temperature, and water immersion status. When the leakage current exceeds the threshold, a red flashing alarm is triggered.
Claims
1. A municipal street lighting leakage current monitoring and location system, characterized in that, include: Municipal street light public service platform, distribution box gateway, street light leakage monitoring terminal; The municipal street light public service platform is used to display the leakage status and location information of the main cable, the working status of the street light, and to push abnormal alarms and maintenance information. The distribution box gateway includes a main processing module, a LoRa communication module, a 4G / 5G network communication module, a Beidou positioning module, and a power supply module. The distribution box gateway communicates with the municipal street light public management platform via wireless 4G / 5G public network and with the street light leakage monitoring terminal via wireless sensor network. The street light leakage current monitoring terminal includes a main processing module, a LoRa communication module, and a residual current monitoring module. The residual current monitoring module includes a residual current transformer and is connected to the main cable to monitor the residual current of the main cable. The system compares the residual current data reported by each street light leakage monitoring terminal to identify the section between the residual current monitoring module with abnormal residual current and the residual current monitoring module with normal residual current on the power supply line, and determines the section as the leakage section; the Beidou positioning module of the distribution box gateway is used to provide the geographical location reference information of the gateway.
2. The municipal lighting street light leakage monitoring and positioning system according to claim 1, characterized in that, When there are multiple leakage sections in the circuit, the system calculates the difference in residual current between adjacent residual current monitoring modules for residual current monitoring modules with abnormal residual current. When the difference in residual current is greater than a preset value, the section between the two residual current monitoring modules is determined to be a leakage section.
3. The municipal lighting street light leakage monitoring and positioning system according to claim 1, characterized in that, The street light leakage current monitoring terminal also includes a street light current and voltage monitoring module, a lamp control module, a temperature sensor, and a water immersion sensor. The street light current and voltage monitoring module includes a residual current transformer and is connected to the branch cable of a single street light to monitor the operating current and operating voltage of a single street light.
4. The municipal lighting street light leakage monitoring and positioning system according to claim 1, characterized in that, The modules and sensors of the street light leakage current monitoring terminal are connected using quick-plug terminal blocks.
5. A municipal lighting street light leakage monitoring and positioning system according to claim 1, characterized in that, It also includes a cloud server. The distribution box gateway is connected to the cloud server via a 4G / 5G network communication module, and the cloud server is connected to the municipal street light public management platform network.
6. A municipal lighting street light leakage monitoring and positioning system according to claim 5, characterized in that, The cloud server can also connect to other terminals, including mobile phones, tablets, and management computers.
7. A municipal lighting street light leakage monitoring and positioning system according to claim 1, characterized in that, The street light leakage current monitoring terminal is installed at the wiring point below the light pole or in the street light well.
8. A method for monitoring and locating leakage current in municipal streetlights, applied to the system described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Each street light leakage monitoring terminal is set up in the same location as the street light to collect data in real time on the operating current, operating voltage, temperature, water immersion status, and residual current of the main cable at the street light. S2: Each street light leakage current monitoring terminal sends the data collected in S1 to its respective distribution box gateway through the LoRa communication module; S3: The distribution box gateway sends the data collected by multiple street light leakage monitoring terminals to the municipal street light public service platform through the 4G / 5G network communication module; S4: The platform or gateway compares and analyzes the residual current data received from each street light leakage monitoring terminal. When the residual current value of the main cable is greater than the preset value, it determines that there is a leakage point in the line and identifies the adjacent street light leakage monitoring terminals with abnormal residual current and those with normal residual current on the line. S5: Based on the identification results of S4, determine that the leakage point is located in the line section between the adjacent street light leakage monitoring terminals; S6: Obtain the location information of the distribution box gateway through the Beidou positioning module, determine the location information of the street light group connected to the distribution box gateway, confirm the location information of the leakage section through the street light numbers at both ends of the leakage section, display the data including the location information of the leakage section on the municipal street light public service platform, and issue an alarm message.
9. A method for monitoring and locating leakage current in municipal streetlights according to claim 8, characterized in that, When there are multiple leakage sections in the line, the difference in residual current between adjacent street light leakage monitoring terminals with abnormal residual current is calculated. When the difference in residual current is greater than a preset value, the adjacent street light leakage monitoring terminals are determined to be leakage sections.
10. A method for monitoring and locating leakage current in municipal streetlights, applied to the system described in any one of claims 1-7, characterized in that, The remote control lighting module enables the streetlights to be turned on intermittently.