Cable fault location real-time monitoring system

Abstract

The present invention discloses a real-time monitoring system for cable fault location. The system includes a data acquisition unit, a data storage unit, a data processing unit, a positioning unit, an alarm unit and a display terminal. The data acquisition unit constructs a monitoring interval according to a number of monitoring nodes of each cable. The monitoring interval is configured with a corresponding acquisition line based on the number and position relationship of the monitoring nodes on each cable and the correlation relationship between two adjacent monitoring nodes. The acquisition line obtains the waveform signal, current signal and position information of each monitoring node according to the correlation relationship between two adjacent monitoring nodes. When a cable fails, the system sends the fault information and the corresponding position information to the display terminal to facilitate remote monitoring of the cables in the monitoring interval and accurately maintain the cables according to the monitored fault position information. There is no need for operating personnel to conduct an overall inspection of the cables, which is convenient for operation, saves time and effort, and greatly improves work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of cable fault location, in particular to a cable fault location real-time monitoring system. Background Art

[0002] Power cables are now widely used in transmission lines across various industries. However, due to various reasons, such as inherent cable defects, rough construction, intermediate joints, and external damage, cables are at risk of damage. This can affect the stable power supply of the entire line and people's normal electricity use. In severe cases, it can cause fires and large-scale power outages, posing a serious threat to people's lives and property, and resulting in significant economic losses to national development. With the rapid development of cities, land scarcity is becoming increasingly severe. Underground cables, with their smaller footprint, are gradually replacing overhead cables as the primary method of cable laying. To minimize the inconvenience and economic losses caused by cable failures, it is crucial to promptly and accurately locate and address cable faults. However, real-time monitoring of cable operation is currently impossible, and the offline troubleshooting techniques used are cumbersome, time-consuming, and inefficient. Summary of the Invention

[0003] In view of this, an object of the present invention is to provide a cable fault location and real-time monitoring system to solve the technical problems mentioned in the prior art.

[0004] A cable fault location real-time monitoring system, the system comprising:

[0005] A data acquisition unit is configured to establish a monitoring interval based on a number of monitoring nodes of each cable. The monitoring interval is configured with a corresponding acquisition line based on the number and positional relationship of the monitoring nodes on each cable and the association relationship between two adjacent monitoring nodes. The acquisition line obtains the waveform signal, current signal and position information of each monitoring node according to the association relationship between two adjacent monitoring nodes;

[0006] a data storage unit connected to the data acquisition unit to cache the waveform signal, current signal, and position information of the monitoring node acquired by the data acquisition unit according to storage rules;

[0007] a data processing unit connected to the data storage unit, configured to continuously read waveform signals from the data storage unit and identify a fault waveform therein, wherein the fault waveform is a waveform signal whose traveling wave amplitude exceeds a preset pulse amplitude; and when a fault waveform of the cable is collected, read the current signal according to a preset collection cycle and identify an abnormal current therein, wherein the abnormal current is a current signal that exceeds a fault current threshold; and then determine whether the corresponding cable has a fault based on a ratio between the number of abnormal currents identified within the same collection cycle and the total number of collections;

[0008] If it is determined that there is no fault in the cable, the operating status of the cable will continue to be monitored;

[0009] If it is determined that the cable is faulty, the fault information of the corresponding cable is sent to the display terminal;

[0010] A positioning unit, configured with a communication module for each monitoring node to store a communication address corresponding to the location information, the positioning unit being connected to the data acquisition unit;

[0011] An alarm unit is connected to the data processing unit and is used to receive the fault information uploaded by the data processing unit to issue an alarm.

[0012] Preferably, the display terminal is embedded with an automatic acquisition program, and the automatic acquisition program is configured with three configuration files, so as to read the configuration files according to the set reading rules when the system is started and connect the acquisition line, wherein the three configuration files are:

[0013] The fault location setting file is provided with a relay control module, a fault parameter setting module and a deletion event interval setting module. The relay control module is used to set the relay start time interval of the incoming line end of the waveform acquisition card installed at each monitoring node; the fault parameter setting module is used to set the fault current threshold of the current collector installed at each monitoring node; the deletion event interval setting module is used to set the storage period of the data storage unit, and the data storage unit caches the monitoring data within the storage period and deletes the monitoring data that exceeds the storage period;

[0014] A monitoring line information setting file, used to set the IP address and port number of each communication module on the monitoring line, as well as the ID number of the relay, waveform acquisition card and current collector corresponding to each communication module, and to set the ID number of each cable and the phase sequence length between two adjacent monitoring nodes on the same cable;

[0015] The database information setting file is used to set the time interval for the database to read the monitoring data from the data storage unit, the server address of the database, and the data retention time of the database.

[0016] Preferably, the storage rules include:

[0017] During the acquisition period, the waveform signal, current signal and position information corresponding to each monitoring node are synchronously stored, and the corresponding time node is configured.

[0018] Preferably, the fault information is at least any one of a waveform signal, a current signal and position information.

[0019] Preferably, the association relationship between two adjacent monitoring nodes is parallel or series.

[0020] Preferably, when the system is started, the monitoring circuit monitors each of the monitoring nodes in an orderly manner according to the set logic rules, wherein the set logic rules are:

[0021] The monitoring circuit monitors the waveform signal and current signal of each monitoring node in turn according to the current transmission direction of the cable.

[0022] Preferably, when the ratio of the number of abnormal currents identified by the data processing unit in the same acquisition cycle to the total number of acquisitions exceeds 50-80%, it is determined that the corresponding cable has a fault.

[0023] Preferably, when the fault location of the cable happens to be at any monitoring node, the data processing unit uses the communication address of the corresponding monitoring node as the location information of the cable fault and sends it to the display terminal;

[0024] When the fault location of the cable is between two adjacent monitoring nodes, the data processing unit calculates the time difference between the previous monitoring node and the fault location of the cable, and calculates the phase sequence length by multiplying the transmission rate of the cable by the time difference, so as to extend the corresponding phase sequence length along the current transmission direction at the communication address of the previous monitoring node to obtain the location information of the cable fault and send it to the display terminal.

[0025] Preferably, the display terminal sends the cable fault information in the form of an SMS message to a communication device connected thereto.

[0026] Preferably, the database is provided with a storage template so that the monitoring data is written one-to-one in accordance with the set format of the storage template;

[0027] Further preferably, the setting format of the storage template is an EXCEL file.

[0028] The beneficial effects that the present invention can produce include:

[0029] The cable fault location real-time monitoring system provided by the present invention arranges a corresponding number of monitoring nodes according to the performance and usage scenarios of the cable to form a monitoring interval, and forms an acquisition line by arranging corresponding acquisition equipment on each monitoring node to monitor the cable operation status of each monitoring node in real time; at the same time, by designing an independent communication module at each monitoring node to obtain corresponding location information, when a cable fails during operation, the system can send the fault information and the corresponding location information to the display terminal, so that the operating personnel can remotely monitor the cables in the monitoring interval and accurately maintain the cables according to the monitored fault location information. There is no need for the operating personnel to conduct an overall inspection of the cables, which is convenient for operation, saves time and effort, and greatly improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the architecture of the cable fault location and real-time monitoring system of the present invention;

[0031] Figure 2 This is a logic block diagram of monitoring data processing in the system of the present invention;

[0032] Figure 3 A schematic diagram of a waveform fault displayed on a display terminal in the present invention;

[0033] In the figure: 1. Data acquisition unit, 2. Data storage unit, 3. Data processing unit, 4. Positioning unit, 5. Alarm unit, 6. Display terminal. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See also Figure 1As shown, the present invention provides a real-time monitoring system for cable fault location, which includes a data acquisition unit 1, a data storage unit 2, a data processing unit 3, a positioning unit 4, an alarm unit 5 and a display terminal 6; wherein the data acquisition unit 1 constructs a monitoring interval according to a number of monitoring nodes of each cable, and the monitoring interval is configured with a corresponding acquisition line based on the number and position relationship of the monitoring nodes on each cable and the association relationship between two adjacent monitoring nodes. The acquisition line obtains the waveform signal, current signal and position information of each monitoring node according to the association relationship between two adjacent monitoring nodes; the data storage unit 2 is connected to the data acquisition unit 1 to cache the waveform signal, current signal and position information of the monitoring node obtained by the data acquisition unit 1 according to the storage rules; the data processing unit 3 is connected to the data storage unit 2 for continuously reading the waveform signal in the data storage unit 2 and identifying the fault waveform therein, as shown in FIG. Figure 3 As shown, the fault waveform is a waveform signal whose traveling wave amplitude exceeds the preset pulse amplitude; when the fault waveform of the cable is collected, the current signal is read according to the preset collection cycle and the abnormal current therein is identified, and the abnormal current is the current signal that exceeds the fault current threshold; then, based on the ratio of the number of abnormal currents identified in the same collection cycle to the total number of collections, it is determined whether the corresponding cable has a fault; if it is determined that the cable does not have a fault, the operating status of the cable continues to be monitored; if it is determined that the cable has a fault, the fault information of the corresponding cable is sent to the display terminal 6; the positioning unit 4 configures a communication module for each monitoring node to store the communication address of the corresponding position information, and the positioning unit 4 is connected to the data collection unit 1 so that the data collection unit 1 collects the position information of each monitoring node; the alarm unit 5 is connected to the data processing unit 3, and is used to receive the fault information uploaded by the data processing unit 3 to issue an alarm.

[0036] In the above, a corresponding number of monitoring nodes are arranged according to the performance and usage scenarios of the cable to form a monitoring interval, and a collection line is formed by arranging corresponding collection equipment on each monitoring node to monitor the cable operation status of each monitoring node in real time; at the same time, an independent communication module is designed at each monitoring node to obtain corresponding location information, so that when a cable fails during operation, the system can send the fault information and the corresponding location information to the display terminal 6, so that the operating personnel can remotely monitor the cables in the monitoring interval and accurately maintain the cables according to the monitored fault location information. There is no need for the operating personnel to conduct an overall inspection of the cables, which is convenient for operation, saves time and effort, and greatly improves work efficiency.

[0037] Furthermore, the display terminal 6 is embedded with an automatic acquisition program, and the automatic acquisition program is configured with three configuration files, so that when the system starts, the configuration files are read according to the set reading rules and the acquisition lines are connected. The three configuration files are a fault location setting file, a monitoring line information setting file, and a database information setting file. In this embodiment, the set reading rules are that the three configuration files are read in sequence according to the order in which they are established. For example, the first configuration file read is the fault location setting file. The fault location setting file is provided with a relay control module, a fault parameter setting module, and a deletion event interval setting module. The relay control module is used to set the relay start time interval of the incoming line end of the waveform acquisition card installed at each monitoring node to restart the waveform acquisition card to prevent the waveform acquisition card from freezing. The fault parameter setting module is used to set the current The fault current threshold of the collector; the deletion event interval setting module is used to set the storage period of the data storage unit 2. The data storage unit 2 caches the monitoring data within the storage period and deletes the monitoring data that exceeds the storage period; the second configuration file read is the monitoring line information setting file. The monitoring line information setting file is used to set the IP address and port number of each communication module on the monitoring line, as well as the ID number of the relay, waveform acquisition card and current collector corresponding to each communication module, and set the ID number of each cable and the phase sequence length between two adjacent monitoring nodes on the same cable; the third configuration file read is the database information setting file. The database information setting file is used to set the time interval for the database to read monitoring data from the data storage unit 2, the server address of the database, and the data retention time of the database. Specifically, the operator can pre-set the corresponding acquisition parameters through the automatic acquisition program so that the system can monitor the operating status of the cable in real time according to the acquisition parameters and transmit the monitored cable fault information back to the display terminal 6.

[0038] In this embodiment, if Figure 2As shown, the system consists of an RTU unit (remote measurement and control terminal) and a Web server (background system service terminal), wherein the RTU unit comprises a data acquisition unit 1, a data storage unit 2 and a data processing unit 3. The acquisition equipment arranged at each monitoring node of the data acquisition unit 1 includes a cable fault distance meter and a power cable fault locator. The cable fault distance meter is used to detect and locate faults such as open circuit, short circuit, loose joints in the cable line to obtain the current signal and position information at the corresponding monitoring node; the power cable fault locator is used to obtain the waveform signal at the corresponding monitoring node; the data acquisition unit 1 and the data storage unit 2 are connected via RJ-45 (UDP protocol) communication to store the waveform signal collected at each monitoring node. , current signal and position information are uploaded to the data storage unit in real time according to the storage rules; specifically, the storage rules can be that the monitoring data receiving server built into the RTU unit writes the collected data into the data storage unit 2 for buffering according to the corresponding byte stream writing speed; the data processing unit 3 monitors the collected data in the data storage unit 2 through the cache monitoring server to read the fault waveform and abnormal current. If it is determined that there is a fault in the cable, the fault information of the corresponding cable is sent to the display terminal 6. The display terminal 6 is a Web server. A monitoring data receiving thread is created according to the built-in automatic collection program, and the collected monitoring data is written into three configuration files respectively, so that the monitoring data is formatted, deleted, and parsed and then output to the display interface for real-time display.

[0039] Furthermore, the storage rules include: during the acquisition cycle, the waveform signal, current signal and position information corresponding to each monitoring node are synchronously stored, and the corresponding time nodes are configured so that the operating personnel can view the previous monitoring data, and analyze the usage of the cable according to the fault information alarm frequency of the cable, so as to replace the cable with safety hazards in time; wherein, the fault information alarm frequency of the cable refers to the time interval between two adjacent fault information of the cable.

[0040] Furthermore, the fault information is at least any one of a waveform signal, a current signal, and location information. In this embodiment, in order to reduce the error of the monitoring data, the fault information includes a waveform signal, a current signal, and location information. After monitoring the fault waveform, the current signal of the cable is further monitored until the ratio of the number of abnormal currents identified by the data processing unit 3 within the same acquisition cycle to the total number of acquisitions exceeds 50-80% (preferably 70%). The corresponding cable is determined to have a fault; the corresponding location information is then synchronously sent to the display terminal 6, allowing operators to view the actual fault location of the cable and quickly repair the cable fault. Specifically, when the cable fault location happens to be at any monitoring node, the data processing unit 3 uses the communication address of the corresponding monitoring node as the cable fault location information and sends it to the display terminal 6. When the cable fault location is between two adjacent monitoring nodes, the data processing unit 3 calculates the time difference between the previous monitoring node and the cable fault location, and calculates the phase sequence length by multiplying the cable transmission rate by the time difference. The corresponding phase sequence length is extended along the current transmission direction at the communication address of the previous monitoring node to obtain the cable fault location information and send it to the display terminal 6. In the above, the display terminal 6 sends the cable fault information to the communication device connected to it in the form of an SMS text message, which can ensure that the cable operation and maintenance personnel can receive the alarm information in a timely manner.

[0041] Furthermore, the association relationship between two adjacent monitoring nodes is parallel or series.

[0042] Furthermore, when the system starts, the monitoring line monitors each monitoring node in an orderly manner according to the set logical rules, wherein the set logical rules are: the monitoring line monitors the waveform signal and current signal of each monitoring node in turn according to the current transmission direction of the cable.

[0043] Furthermore, the database is configured with a storage template to store the monitoring data in a one-to-one correspondence according to the format set in the storage template; in this embodiment, the storage template is set in an Excel file format. By storing the monitoring data in a unified format, it is convenient to provide cable operation and maintenance personnel with services such as online retrieval, data statistics, and data export of this historical data.

[0044] In the present invention, the system is configured with at least one administrator account and multiple operator accounts, wherein the administrator account is used to load the monitoring data of all monitoring intervals, and login permissions are set for the operator account so that the operator account can only load the monitoring data of a single monitoring interval, which is convenient for centralized management; it should be noted that both administrators and operators can add, modify, view and delete the monitoring data of the monitoring intervals that they can view.

Claims

1. Cable fault location real-time monitoring system, characterized by: The system comprises: A data acquisition unit (1) constructs a monitoring interval based on a number of monitoring nodes of each cable, wherein the monitoring interval is configured with a corresponding acquisition line based on the number and position relationship of the monitoring nodes on each cable and the association relationship between two adjacent monitoring nodes, wherein the acquisition line acquires the waveform signal, current signal and position information of each monitoring node according to the association relationship between the two adjacent monitoring nodes, and the association relationship between the two adjacent monitoring nodes is parallel or series; A data storage unit (2) is connected to the data acquisition unit (1) to cache the waveform signal, current signal and position information of the monitoring node acquired by the data acquisition unit (1) according to storage rules; A data processing unit (3) is connected to the data storage unit (2) and is used to continuously read waveform signals in the data storage unit (2) and identify fault waveforms therein, wherein the fault waveform is a waveform signal whose traveling wave amplitude exceeds a preset pulse amplitude; when the fault waveform of the cable is collected, the current signal is read according to a preset collection cycle and abnormal current is identified therein, wherein the abnormal current is a current signal exceeding a fault current threshold; and whether the corresponding cable has a fault is determined based on the ratio between the number of abnormal currents identified in the same collection cycle and the total number of collections; If it is determined that there is no fault in the cable, the operating status of the cable will continue to be monitored; If it is determined that the cable is faulty, the fault information of the corresponding cable is sent to the display terminal (6); A positioning unit (4) is configured with a communication module for each monitoring node to store a communication address corresponding to the location information, and the positioning unit (4) is connected to the data acquisition unit (1); An alarm unit (5), connected to the data processing unit (3), for receiving fault information uploaded by the data processing unit (3) to issue an alarm; The display terminal (6) is embedded with an automatic acquisition program, and the automatic acquisition program is configured with three configuration files, so as to read the configuration files according to the set reading rules when the system is started and connect the acquisition line, wherein the three configuration files are: A fault location setting file is provided with a relay control module, a fault parameter setting module and a deletion event interval setting module, wherein the relay control module is used to set the relay start-up time interval of the incoming line end of the waveform acquisition card installed at each monitoring node; the fault parameter setting module is used to set the fault current threshold of the current collector installed at each monitoring node; the deletion event interval setting module is used to set the storage period of the data storage unit (2), and the data storage unit (2) caches the monitoring data within the storage period and deletes the monitoring data that exceeds the storage period; A monitoring line information setting file, used to set the IP address and port number of each communication module on the monitoring line, as well as the ID number of the relay, waveform acquisition card and current collector corresponding to each communication module, and to set the ID number of each cable and the phase sequence length between two adjacent monitoring nodes on the same cable; The database information setting file is used to set the time interval for the database to read monitoring data from the data storage unit (2), the server address of the database, and the data retention time of the database.

2. The cable fault location real-time monitoring system according to claim 1, characterized in that: The storage rules include: During the acquisition period, the waveform signal, current signal and position information corresponding to each monitoring node are synchronously stored, and the corresponding time node is configured.

3. The cable fault location real-time monitoring system according to claim 1, characterized in that: The fault information is at least any one of a waveform signal, a current signal and position information.

4. The cable fault location real-time monitoring system according to claim 1, characterized in that: When the system starts, the monitoring circuit monitors each monitoring node in an orderly manner according to the set logic rules, wherein the set logic rules are: The monitoring circuit monitors the waveform signal and current signal of each monitoring node in turn according to the current transmission direction of the cable.

5. The cable fault location real-time monitoring system according to claim 1, characterized in that: When the ratio of the number of abnormal currents identified by the data processing unit (3) in the same acquisition cycle to the total number of acquisitions exceeds 50-80%, it is determined that the corresponding cable has a fault.

6. The cable fault location real-time monitoring system according to claim 1, characterized in that: When the fault location of the cable happens to be at any monitoring node, the data processing unit (3) uses the communication address of the corresponding monitoring node as the location information of the cable fault and sends it to the display terminal (6); When the fault position of the cable is between two adjacent monitoring nodes, the data processing unit (3) calculates the time difference between the previous monitoring node and the fault position of the cable, and calculates the phase sequence length by multiplying the transmission rate of the cable by the time difference, so as to extend the corresponding phase sequence length along the transmission direction of the current at the communication address of the previous monitoring node to obtain the position information of the cable fault and send it to the display terminal (6).

7. The cable fault location real-time monitoring system according to claim 1, characterized in that: The display terminal (6) sends the cable fault information in the form of an SMS message to the communication device connected thereto.

8. The cable fault location real-time monitoring system according to claim 1, characterized in that: The database is provided with a storage template so that the monitoring data can be written into the storage template in a one-to-one correspondence according to the set format of the storage template; The setting format of the storage template is an EXCEL file.

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