Low voltage cable leakage current detection system

Abstract

The application relates to the technical field of electric leakage detection, and provides a low-voltage cable leakage current detection system which can accurately position the electric leakage position of a low-voltage cable. In the application, each monitoring point of the low-voltage cable is provided with a leakage current detection module and a carrier wave communication module; the leakage current detection module is used for acquiring zero sequence current data of the low-voltage cable at the monitoring point, and transmitting the zero sequence current data to the carrier wave communication module at the same monitoring point through a serial communication data line; the carrier wave communication module is used for transmitting the zero sequence current data to a carrier wave communication concentrator module through a carrier wave communication data line, a zero line and a phase line connected with the carrier wave communication data line after receiving the zero sequence current data; and the carrier wave communication concentrator module is used for determining whether there is a leakage current condition at the monitoring point according to the zero sequence current data sent by each carrier wave communication module and the monitoring point set by each carrier wave communication module.

Description

Technical Field

[0001] This application relates to the field of leakage current detection technology, and in particular to a low-voltage cable leakage current detection system, a leakage current detection module, a carrier communication module, and a carrier communication concentrator module. Background Technology

[0002] The health of low-voltage cables in the vertical shafts of high-rise buildings is one of the risks that could cause fires. If a low-voltage cable in a shaft breaks down and burns, it can lead to a fire in the shaft and even spread to other floors, causing mass casualties. In some high-rise buildings, multiple pipelines share a shaft, and the shaft space is relatively narrow. If a low-voltage cable is leaking, it is very easy for maintenance personnel to accidentally touch the metal casing of the low-voltage cable tray and get electrocuted. The possibility of cables in high-rise vertical shafts being damaged by external forces is extremely low; the fire is usually caused by the gradual breakdown of insulation due to aging and discharge, leading to a chain reaction of fires. Related technologies often make it difficult to pinpoint which floor's low-voltage cable is leaking. Summary of the Invention

[0003] Therefore, it is necessary to provide a low-voltage cable leakage current detection system, a leakage current detection module, a carrier communication module, and a carrier communication concentrator module to address the above-mentioned technical problems.

[0004] This application provides a low-voltage cable leakage current detection system, the system including multiple leakage current detection modules, multiple carrier communication modules and a carrier communication concentrator module;

[0005] Each monitoring point of the low-voltage cable is equipped with the leakage current detection module and the carrier communication module; the leakage current detection module and the carrier communication module located at the same monitoring point are connected by a serial communication data line; the carrier communication data line of each carrier communication module and the carrier communication data line of the carrier communication concentrator module are connected to the neutral wire and one of the phase wires of the low-voltage cable.

[0006] Each of the leakage current detection modules is used to acquire the zero-sequence current data of the low-voltage cable at the monitoring point and transmit the zero-sequence current data to the carrier communication module at the same monitoring point through the serial communication data line.

[0007] Each of the carrier communication modules is configured to transmit the zero-sequence current data to the carrier communication concentrator module via the carrier communication data line and the neutral and phase lines connected to the carrier communication data line after receiving the zero-sequence current data.

[0008] The carrier communication concentrator module is used to determine whether there is leakage current at the monitoring point based on the zero-sequence current data sent by each carrier communication module and the monitoring point set by each carrier communication module.

[0009] In an exemplary embodiment, the monitoring point is further equipped with a zero-sequence sensor, and the zero-sequence sensor and the leakage current detection module located at the same monitoring point are connected by a wire; the zero-sequence sensor is used to collect the zero-sequence current data of the monitoring point and send it to the corresponding leakage current detection module through the wire.

[0010] In one exemplary embodiment, the power supply of each of the carrier communication modules is connected to the other two phase lines of the low-voltage cable to obtain electrical energy.

[0011] In one exemplary embodiment, the power supply of the carrier communication concentrator module is connected to the other two phase lines of the low-voltage cable to obtain electrical energy.

[0012] In an exemplary embodiment, in the low-voltage cable, the phase line connected to the carrier communication data line is phase A, and the phase lines connected to the power supply are phase B and phase C.

[0013] In an exemplary embodiment, when the carrier communication module receives the zero-sequence current data, it transmits the zero-sequence current data to the carrier communication concentrator module via the carrier communication data line and the neutral and phase lines connected to the carrier communication data line, specifically for the following purposes:

[0014] The zero-sequence current data is preprocessed, and the preprocessed zero-sequence current data is transmitted to the carrier communication concentrator module through the carrier communication data line and the neutral and phase lines connected to the carrier communication data line.

[0015] In one exemplary embodiment, the carrier communication concentrator module is equipped with an Internet of Things (IoT) card;

[0016] The carrier communication concentrator module is used to send the corresponding zero-sequence current data and the location information of the monitoring point to the server via the Internet of Things card after determining that there is leakage current at any of the monitoring points.

[0017] This application provides a leakage current detection module, which is the leakage current detection module in the low-voltage cable leakage current detection system described in any of the above embodiments.

[0018] This application provides a carrier communication module, which is the carrier communication module in the low-voltage cable leakage current detection system described in any of the above embodiments.

[0019] This application provides a carrier communication concentrator module, which is the carrier communication concentrator module in the low-voltage cable leakage current detection system described in any of the above embodiments.

[0020] In the solution provided in this application, each monitoring point of the low-voltage cable is equipped with a leakage current detection module and a carrier communication module; the leakage current detection module and the carrier communication module located at the same monitoring point are connected via a serial communication data line; the carrier communication data line of each carrier communication module and the carrier communication concentrator module are connected to the neutral wire and one of the phase wires of the low-voltage cable; each leakage current detection module is used to acquire the zero-sequence current data of the low-voltage cable at the monitoring point and transmit the zero-sequence current data to the carrier communication module at the same monitoring point via the serial communication data line; each carrier communication module, upon receiving the zero-sequence current data, transmits the zero-sequence current data to the carrier communication concentrator module via the carrier communication data line and the neutral wire and phase wire connected to the carrier communication data line; the carrier communication concentrator module is used to determine whether there is leakage current at the monitoring point based on the zero-sequence current data sent by each carrier communication module and the monitoring point set by each carrier communication module. Therefore, it is possible to accurately locate the floor where the low-voltage cable is leaking current. Moreover, the carrier communication data of the carrier communication module and the carrier communication concentrator module are both connected to the neutral wire and one of the phase wires of the low-voltage cable. Subsequently, the carrier communication module and the carrier communication concentrator module can transmit data through the neutral wire and the phase wire, without the need to lay additional communication cables, thus reducing the deployment difficulty. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is one of the schematic diagrams of the architecture of a low-voltage cable leakage current detection system in one embodiment;

[0023] Figure 2 This is a second schematic diagram of the architecture of a low-voltage cable leakage current detection system in one embodiment;

[0024] Figure 3 This is the third schematic diagram of the architecture of a low-voltage cable leakage current detection system in one embodiment;

[0025] Figure 4 This is the fourth schematic diagram of the architecture of a low-voltage cable leakage current detection system in one embodiment. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various objects, but these objects are not limited by these terms. These terms are only used to distinguish the first object from the second object. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the solutions, or any combination of multiple solutions.

[0028] The low-voltage cable leakage current detection system provided in this application includes multiple leakage current detection modules, multiple carrier communication modules, and a carrier communication concentrator module, such as... Figure 1 As shown.

[0029] Each monitoring point of the low-voltage cable is equipped with the leakage current detection module and the carrier communication module; the leakage current detection module and the carrier communication module located at the same monitoring point are connected by a serial communication data line; the carrier communication data line of each carrier communication module and the carrier communication data line of the carrier communication concentrator module are connected to the neutral wire and one of the phase wires of the low-voltage cable.

[0030] Specifically, multiple monitoring points can be determined according to actual needs. For example, monitoring points can be set at regular intervals along the low-voltage cable (such as each floor or the front end of each household entrance). For each monitoring point, a leakage current detection module and a carrier communication module can be installed. The leakage current detection module and the carrier communication module at the same monitoring point are connected via a serial communication data line, such as, but not limited to, an RS485 bus. The low-voltage cable includes three phases (A, B, and C) and a neutral wire; one phase wire and the neutral wire are both connected to the carrier communication data lines of both the carrier communication module and the carrier communication concentrator module. The aforementioned low-voltage cable can be a low-voltage cable installed in a vertical shaft.

[0031] Each of the leakage current detection modules is used to acquire the zero-sequence current data of the low-voltage cable at the monitoring point, and transmit the zero-sequence current data to the carrier communication module at the same monitoring point through the serial communication data line.

[0032] Specifically, a leakage current detection module is installed at any monitoring point of the low-voltage cable. This module can acquire the zero-sequence current data at that monitoring point. The zero-sequence current data can be used to determine whether leakage occurs. After obtaining the zero-sequence current data at the corresponding monitoring point, the leakage current detection module can transmit the zero-sequence current data to a carrier communication module located at the same monitoring point via a serial communication data line (such as an RS485 bus).

[0033] Each of the carrier communication modules is configured to transmit the zero-sequence current data to the carrier communication concentrator module via the carrier communication data line and the neutral and phase lines connected to the carrier communication data line after receiving the zero-sequence current data.

[0034] Specifically, a carrier communication module is installed at any monitoring point of the low-voltage cable. This carrier communication module can obtain the zero-sequence current data of the monitoring point through the leakage current detection module. After receiving the zero-sequence current data, it can transmit the zero-sequence current data to the carrier communication concentrator module via carrier communication. The transmission path of the zero-sequence current data is: carrier communication data line of the carrier communication module -> neutral and phase lines -> carrier communication data line of the carrier communication concentrator module. Therefore, the zero-sequence current data can be transmitted from the carrier communication module to the carrier communication concentrator module via the neutral and phase lines of the low-voltage cable without the need for additional communication cables. The carrier communication can adopt the power line carrier communication technology standard in related technologies.

[0035] The carrier communication concentrator module is used to determine whether there is leakage current at the monitoring point based on the zero-sequence current data sent by each carrier communication module and the monitoring point set by each carrier communication module.

[0036] Specifically, the carrier communication concentrator module can support several terminals (such as carrier communication modules). In some scenarios, the maximum communication distance between the carrier communication concentrator module and the terminals is less than or equal to 500 meters. The carrier communication concentrator module can use a polling method to view the zero-sequence current data of each carrier communication module. When leakage is determined based on the zero-sequence current data of a certain carrier communication module, the monitoring point where the carrier communication module is located can be determined, thereby confirming the presence of leakage current at that monitoring point.

[0037] In the above scheme, each monitoring point of the low-voltage cable is equipped with a leakage current detection module and a carrier communication module; the leakage current detection module and the carrier communication module located at the same monitoring point are connected via a serial communication data line; the carrier communication data line of each carrier communication module and the carrier communication concentrator module are connected to the neutral wire and one of the phase wires of the low-voltage cable; each leakage current detection module is used to acquire the zero-sequence current data of the low-voltage cable at the monitoring point and transmit the zero-sequence current data to the carrier communication module at the same monitoring point via the serial communication data line; each carrier communication module, upon receiving the zero-sequence current data, transmits the zero-sequence current data to the carrier communication concentrator module via the carrier communication data line and the neutral wire and phase wire connected to the carrier communication data line; the carrier communication concentrator module is used to determine whether there is leakage current at the monitoring point based on the zero-sequence current data sent by each carrier communication module and the monitoring point set by each carrier communication module. Therefore, it is possible to accurately locate the floor where the low-voltage cable is leaking current. Moreover, the carrier communication data of the carrier communication module and the carrier communication concentrator module are both connected to the neutral wire and one of the phase wires of the low-voltage cable. Subsequently, the carrier communication module and the carrier communication concentrator module can transmit data through the neutral wire and the phase wire, without the need to lay additional communication cables, thus reducing the deployment difficulty.

[0038] In an exemplary embodiment, the monitoring point is further equipped with a zero-sequence sensor, and the zero-sequence sensor and the leakage current detection module located at the same monitoring point are connected by a wire; the zero-sequence sensor is used to collect the zero-sequence current data of the monitoring point and send it to the corresponding leakage current detection module through the wire.

[0039] Each monitoring point of the low-voltage cable can also be equipped with a zero-sequence sensor. The zero-sequence sensor can be fixed on the low-voltage cable. The zero-sequence sensor can send the zero-sequence current data collected at the monitoring point to the corresponding leakage current detection module through the wire, thereby realizing real-time monitoring and accurate location of leakage current at each monitoring point of the low-voltage cable.

[0040] In one exemplary embodiment, the power supply of each of the carrier communication modules is connected to the other two phase lines of the low-voltage cable to obtain electrical energy.

[0041] As mentioned above, one phase wire of the low-voltage cable is connected to the carrier communication data line of the carrier communication module, and the other two phase wires of the low-voltage cable can be connected to the power supply of the carrier communication module, thereby providing power to the carrier communication module and simplifying the field wiring requirements of the carrier communication module.

[0042] In one exemplary embodiment, the power supply of the carrier communication concentrator module is connected to the other two phase lines of the low-voltage cable to obtain electrical energy.

[0043] As mentioned above, one phase of the low-voltage cable is connected to the carrier communication data line of the carrier communication concentrator module, and the other two phases of the low-voltage cable can be connected to the power supply of the carrier communication concentrator module, thereby providing power to the carrier communication concentrator module and simplifying the field wiring requirements of the carrier communication concentrator module.

[0044] In an exemplary embodiment, in the low-voltage cable, the phase line connected to the carrier communication data line is phase A, and the phase lines connected to the power supply are phase B and phase C.

[0045] The low-voltage cable includes a neutral wire, A-phase wire, B-phase wire, and C-phase wire. The A-phase wire and neutral wire are connected to the carrier communication data lines of the carrier communication module and the carrier communication data lines of the carrier communication concentrator module. The B-phase wire and C-phase wire are connected to the power supply of the carrier communication module and the power supply of the carrier communication concentrator module. Thus, the carrier signal can be coupled into a single-phase loop between the A-phase wire and the neutral wire, utilizing the neutral wire's continuity to obtain a stable transmission path. The power supply is taken from the 380V line voltage of phases B and C, ensuring wide-range power supply efficiency and isolating switching power supply noise outside the signal injection phase. This effectively improves the signal-to-noise ratio and communication reliability, while meeting the ≤500-meter carrier coverage requirement and distributing the three-phase load to avoid single-phase overload.

[0046] In an exemplary embodiment, when the carrier communication module receives the zero-sequence current data, it transmits the zero-sequence current data to the carrier communication concentrator module via the carrier communication data line and the neutral and phase lines connected to the carrier communication data line, specifically for the following purposes:

[0047] The zero-sequence current data is preprocessed, and the preprocessed zero-sequence current data is transmitted to the carrier communication concentrator module through the carrier communication data line and the neutral and phase lines connected to the carrier communication data line.

[0048] After receiving zero-sequence current data, the carrier communication module can first preprocess the zero-sequence current data, and then transmit the preprocessed zero-sequence current data to the carrier communication concentrator module through carrier communication, thereby eliminating invalid data and reducing the transmission burden.

[0049] In an exemplary embodiment, the carrier communication concentrator module is equipped with an Internet of Things (IoT) card; the carrier communication concentrator module is used to send the corresponding zero-sequence current data and the location information of the monitoring point to the server via the IoT card after determining that there is a leakage current at any of the monitoring points.

[0050] The carrier communication concentrator module has a built-in IoT card, which allows it to transmit data to a remote backend server. Specifically, after determining that any of the monitoring points has leakage current, the carrier communication concentrator module sends the corresponding zero-sequence current data and the location information of the monitoring point to the server via the IoT card. This enables power grid companies to promptly identify and address weak points in the insulation of low-voltage cables in vertical shafts, thereby eliminating potential fire hazards from low-voltage cables in high-rise buildings.

[0051] To better understand the above method, an application example of the low-voltage cable leakage current detection system of this application is described in detail below. This embodiment provides a low-voltage cable leakage current detection scheme based on carrier communication and Internet of Things transmission, which can be applied to a low-voltage cable leakage current detection system. The low-voltage cable leakage current detection system includes multiple leakage current detection modules, multiple carrier communication modules, and a carrier communication concentrator module.

[0052] The low-voltage cable leakage current detection system may also include a zero-sequence sensor and a signal processing module. The data preprocessing operations of the carrier communication module are placed within the signal processing module, such as... Figure 2 As shown.

[0053] Each monitoring point on the low-voltage cable is equipped with a zero-sequence sensor, a leakage current detection module, and a carrier communication module. The zero-sequence sensor and leakage current detection module at the same monitoring point are connected by a wire; the leakage current detection module and carrier communication module at the same monitoring point are connected via an RS485 bus; the carrier communication data line of the carrier communication module is connected to the neutral wire and phase A wire of the low-voltage cable, and the power supply of the carrier communication module is connected to the phase B and phase C wires of the low-voltage cable. Figure 3 As shown.

[0054] The carrier communication data line of the carrier communication concentrator module is connected to the neutral wire and phase A wire of the low-voltage cable, and the power supply of the carrier communication concentrator module is connected to the phase B and phase C wires of the low-voltage cable, as follows. Figure 4 As shown.

[0055] According to the detection principle of the zero-sequence sensor, the zero-sequence current data of the low-voltage cable is detected, so as to determine whether there is a leakage phenomenon. Specifically, several monitoring points on the low-voltage cable can be determined at intervals according to actual needs (such as every floor, the front end of each household entrance). At each monitoring point, a zero-sequence sensor, a leakage current detection device and a carrier communication module can be placed. Through the carrier communication method, the collected zero-sequence current data and possible alarm information can be transmitted to the carrier communication concentrator module through the cable. Each carrier communication concentrator module can support 64 terminals (expandable to 256). After the concentrator internally processes the data of all terminals, it uploads the data to the server of the remote background through the Internet of Things for real-time viewing and real-time warning. The carrier communication concentrator module can be equipped with a human-machine interface for real-time display and query.

[0056] The zero-sequence sensor supporting the leakage current detection module can be fixed on the low-voltage cable and connected to the leakage current detection module through a wire. The low-voltage cable belongs to the power supply cable.

[0057] The carrier communication module communicates with the leakage current detection module through the RS485 bus. After the data is preprocessed inside the carrier communication module, it is transmitted to the concentrator module through the carrier communication method using the low-voltage cable.

[0058] The carrier communication concentrator module can be installed at any convenient position for viewing and maintenance within the system. A single carrier communication concentrator module can support a maximum of 256 terminal data modules, and the maximum communication distance between the terminal data module and the concentrator module is ≤500m. The carrier communication concentrator module can use the polling method to view the preprocessed data of each carrier communication module. The carrier communication concentrator module is equipped with a human-machine interface and uses a paging method to display the real-time working conditions and alarm information of each data terminal. Through the layout of each terminal module, the position where leakage current may exist can be quickly determined. The carrier communication concentrator module is built-in with an Internet of Things card, and the data can be transmitted to the remote server through the Internet of Things card.

[0059] The solution provided in this embodiment can be flexibly configured according to actual needs. Moreover, there is no need to lay additional communication cables, the installation is simple, the safety is high, the cost is saved, and the efficiency is improved; in addition, the data can be transmitted through the 4G Internet of Things technology, with high real-time performance and convenient monitoring. The communication protocol involved in this solution can be compatible with the internal intelligent management platform of the power grid and can be accessed to the platform for comprehensive monitoring at any time.

[0060] The solution provided in this embodiment enables efficient and low-cost detection and alarm of leakage current in low-voltage cables in vertical shafts of high-rise buildings. It can monitor the presence and intensity of leakage current in the cable shaft in real time, and then transmit relevant data, including alarm and location information, to a backend server via carrier communication. This allows power grid companies to promptly identify weak points in the insulation of low-voltage cables in the shaft and take timely action, thus eliminating potential fire hazards caused by low-voltage cables in high-rise buildings. The solution also supports on-site temperature and humidity monitoring, facilitating the construction of a comprehensive intelligent power cable monitoring system.

[0061] In one exemplary embodiment, a leakage current detection module is provided, which is the leakage current detection module in the low-voltage cable leakage current detection system described in any of the above embodiments.

[0062] In one exemplary embodiment, a carrier communication module is provided, which is the carrier communication module in the low-voltage cable leakage current detection system described in any of the above embodiments.

[0063] In one exemplary embodiment, a carrier communication concentrator module is provided, which is the carrier communication concentrator module in the low-voltage cable leakage current detection system described in any of the above embodiments.

[0064] In one exemplary embodiment, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the steps described in the various embodiments above.

[0065] In one exemplary embodiment, a computer program product is provided having a computer program stored thereon, the computer program being executed by a processor of the steps described in the various embodiments above.

[0066] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0067] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not contradict each other, they should be considered within the scope of this application.

[0068] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A low-voltage cable leakage current detection system, characterized in that, The system includes multiple leakage current detection modules, multiple carrier communication modules, and a carrier communication concentrator module; Each monitoring point of the low-voltage cable is equipped with the leakage current detection module and the carrier communication module; the leakage current detection module and the carrier communication module located at the same monitoring point are connected by a serial communication data line; the carrier communication data line of each carrier communication module and the carrier communication data line of the carrier communication concentrator module are connected to the neutral wire and one of the phase wires of the low-voltage cable. Each of the leakage current detection modules is used to acquire the zero-sequence current data of the low-voltage cable at the monitoring point and transmit the zero-sequence current data to the carrier communication module at the same monitoring point through the serial communication data line. Each of the carrier communication modules is configured to transmit the zero-sequence current data to the carrier communication concentrator module via the carrier communication data line and the neutral and phase lines connected to the carrier communication data line after receiving the zero-sequence current data. The carrier communication concentrator module is used to determine whether there is leakage current at the monitoring point based on the zero-sequence current data sent by each carrier communication module and the monitoring point set by each carrier communication module.

2. The low-voltage cable leakage current detection system according to claim 1, characterized in that, The monitoring point is also equipped with a zero-sequence sensor. The zero-sequence sensor and the leakage current detection module located at the same monitoring point are connected by a wire. The zero-sequence sensor is used to collect the zero-sequence current data of the monitoring point and send it to the corresponding leakage current detection module through the wire.

3. The low-voltage cable leakage current detection system according to claim 1, characterized in that, The power supply of each of the carrier communication modules is connected to the other two phase lines of the low-voltage cable to obtain electrical energy.

4. The low-voltage cable leakage current detection system according to claim 1, characterized in that, The power supply of the carrier communication concentrator module is connected to the other two phase lines of the low-voltage cable to obtain electrical energy.

5. The low-voltage cable leakage current detection system according to claim 3 or 4, characterized in that, In the low-voltage cable, the phase line connected to the carrier communication data line is phase A, and the phase lines connected to the power supply are phase B and phase C.

6. The low-voltage cable leakage current detection system according to claim 1, characterized in that, After receiving the zero-sequence current data, the carrier communication module transmits the zero-sequence current data to the carrier communication concentrator module via the carrier communication data line and the neutral and phase lines connected to the carrier communication data line. Specifically, this is used for: The zero-sequence current data is preprocessed, and the preprocessed zero-sequence current data is transmitted to the carrier communication concentrator module through the carrier communication data line and the neutral and phase lines connected to the carrier communication data line.

7. The low-voltage cable leakage current detection system according to claim 1, characterized in that, The carrier communication concentrator module is equipped with an Internet of Things (IoT) card. The carrier communication concentrator module is used to send the corresponding zero-sequence current data and the location information of the monitoring point to the server via the Internet of Things card after determining that there is leakage current at any of the monitoring points.

8. A leakage current detection module, characterized in that, The leakage current detection module is the leakage current detection module in the low-voltage cable leakage current detection system according to any one of claims 1 to 7.

9. A carrier communication module, characterized in that, The carrier communication module is the carrier communication module in the low-voltage cable leakage current detection system according to any one of claims 1 to 7.

10. A carrier communication concentrator module, characterized in that, The leakage current detection module is the carrier communication concentrator module in the low-voltage cable leakage current detection system according to any one of claims 1 to 7.

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