Monitoring system for unbalanced current

Abstract

The utility model relates to the field of rail transit, in particular to an unbalanced current monitoring system. An unbalanced current monitoring system comprises a detection extension set and a data terminal. The detection extension set is connected with a hollow coil of a target track circuit section and used for collecting unbalanced current of the target track circuit section, and the target track circuit section is a track circuit section needing to be monitored; and the data terminal is in communication connection with the detection extension set through a special wireless network and is used for acquiring the unbalanced current data acquired by the detection extension set. The problems that in the prior art, when double clamp meters are used for measurement, errors are large, only the total current amount in the steel rail can be measured, and the signal current component of a track circuit cannot be filtered out are solved, monitoring of the unbalanced current in the steel rail can be achieved only through one connection point, the labor cost of unbalanced current detection is reduced, and the detection efficiency is improved. And the accuracy of unbalanced current monitoring is improved.

Description

Technical Field

[0001] This utility model relates to the field of rail transit, and specifically to a monitoring system for unbalanced current. Background Technology

[0002] In electrified track sections, part of the traction current returns to the traction substation via the return line, part flows along the rails to the substation via the ground wire near the substation, and a small amount flows through the track bed to the ground or is lost. The rails and the ground are components of the traction current return path, with current values ​​reaching hundreds of amperes flowing through them.

[0003] The impact of traction return current on track circuit transmission is mainly reflected in traction current imbalance. Traction current imbalance refers to the difference in traction current between the two rails of the track at the same time. Due to the presence of equipment such as choke transformers, under normal circumstances, the current flowing through the two rails is equal, and the operation of the track circuit is not affected; however, if the traction current of the two rails is unbalanced and exceeds a certain value, it will burn out the signaling equipment and affect the normal operation of the equipment.

[0004] Currently, the traction return current imbalance detection equipment used on-site mainly consists of various types of pre-made clamp-on ammeters. Some signal-related units have also developed some testing equipment based on clamp-on ammeters. When using clamp-on ammeters, two clamps are connected to the rail leads of the choke transformer, and test data is obtained by manual observation and recording. A single clamp-on ammeter can only measure the current of a single rail; when using two clamp-on ammeters, due to differences in the technical condition of the two devices and the reaction time of manual reading, the error is relatively large, and only the total current in the rail can be measured, without filtering out the current component of the track circuit signal. Utility Model Content

[0005] The purpose of this utility model is to provide at least one unbalanced current monitoring system, which solves the problems of large errors in the prior art when using two clamp meters for measurement due to differences in the technical condition of the two devices and the reaction time of manual reading, and the fact that it can only measure the total current in the rail and cannot filter out the current component of the track circuit signal. The new system enables the monitoring of unbalanced current in the rail with only one connection point, and the monitoring results can be uploaded to the data terminal in real time, making the obtained data more accurate and eliminating the need for on-site personnel. This greatly reduces the labor cost of unbalanced current detection and improves the accuracy of unbalanced current monitoring.

[0006] To address the aforementioned technical problems, this application provides an unbalanced current monitoring system, comprising: a detection unit and a data terminal; the detection unit is connected to an air coil of a target track circuit section for collecting the unbalanced current of the target track circuit section, wherein the target track circuit section is the track circuit section to be monitored; the data terminal is connected to the detection unit via a dedicated wireless network for acquiring the unbalanced current data collected by the detection unit.

[0007] In some embodiments, the detection unit includes: a current sensor, a power supply module, an energy-saving module, a signal conditioning module, an A / D conversion module, a digital signal processing module, a local storage module, and a wireless communication module; the current sensor is connected to an air-core coil and is used to collect unbalanced current passing through the air-core coil; the energy-saving module is connected to the current sensor and is used to wake up the various electrical components of the detection unit when the current collected by the current sensor is greater than a threshold; the signal conditioning module is connected to the current sensor and uses an electromagnetic coupling isolation circuit to achieve input protection; the A / D conversion module is connected to the signal conditioning module and electrically connected to the energy-saving module, and is used to convert the signal... The signal output from the conditioning module is converted from digital to analog. The digital signal processing module is connected to the A / D conversion module and electrically connected to the energy-saving module, and is used to process the digital signal output from the A / D conversion module. The local storage module is connected to the digital signal processing module and electrically connected to the energy-saving module, and is used to store the processing results of the digital signal processing module. The wireless communication module is electrically connected to the digital processing module and communicatively connected to the data terminal, and is used to send the processing results of the digital signal processing module to the data terminal. The power supply module is electrically connected to the A / D conversion module, the digital signal processing module, the storage module, and the wireless communication module.

[0008] In some embodiments, the current sensor includes: a clamp and a Hall sensor; the clamp is used to connect the detection unit to the hollow coil; the clamp is a magnet with an insulating layer coated on its surface; a Hall sensor is disposed between two magnets at the tail of the clamp, and the unbalanced current in the hollow coil causes a change in the magnetic flux of the magnet in the clamp, thereby causing the Hall sensor to detect the current; the Hall sensor is electrically connected to the energy-saving module and the signal conditioning module.

[0009] In some embodiments, the power module includes: a charging module, a battery, and a voltage regulator module; the charging module is electrically connected to the battery and is used to charge the battery; the voltage regulator module is electrically connected to the battery and is used to supply power to various components of the detection unit.

[0010] In some embodiments, the data terminal includes: a data receiving module, a first display module, a second display module, and a data analysis module; the data receiving module is communicatively connected to the detection sub-unit; the first display module is connected to the data receiving module and is used to display the data received by the data receiving module; the data analysis module is connected to the data receiving module and is used to analyze and process the data received by the data receiving module according to a preset algorithm; the second display module is connected to the data analysis module and is used to display the analysis results of the data analysis module.

[0011] In some embodiments, the detection unit further includes current sensors with different ranges, wherein the current sensors with different ranges are all connected to an air coil.

[0012] In some embodiments, the core processor of the digital signal processing module is a TI-DSP-F28335.

[0013] The embodiments of this application provide an unbalanced current monitoring system, which at least solves the problems of large errors in the prior art when using two clamp meters for measurement, due to differences in the technical condition of the two devices and the reaction time of manual reading, and the fact that it can only measure the total current in the rail and cannot filter out the current component of the track circuit signal. The system realizes that only one connection point is needed to monitor the unbalanced current in the rail, and the monitoring results can be uploaded to the data terminal in real time, making the obtained data more accurate and eliminating the need for on-site personnel. This greatly reduces the labor cost of unbalanced current detection and improves the accuracy of unbalanced current monitoring. Attached Figure Description

[0014] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0015] Figure 1 This is a schematic diagram of the connection relationship of an unbalanced current monitoring system provided in an embodiment of this application;

[0016] Figure 2 This is a schematic block diagram of the structure of a detection sub-unit provided in an embodiment of this application;

[0017] Figure 3 This is a schematic diagram of the structure of a current sensor provided in an embodiment of this application.

[0018] In the diagram: 1-Detection unit, 2-Data terminal, 3-Current sensor, 4-Signal conditioning module, 5-A / D conversion module, 6-Digital signal processing module, 7-Local storage module, 8-Wireless communication module, 9-Energy saving module, 10-Power supply module, 11-Clamp, 12-Hall sensor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to enable readers to better understand this utility model. However, the technical solutions claimed by this utility model can be implemented even without these technical details and with various changes and modifications based on the following embodiments.

[0020] Currently, the traction return current imbalance detection equipment used on-site mainly consists of various types of pre-made clamp-on ammeters. Some signal-related units have also developed some testing equipment based on clamp-on ammeters. When using clamp-on ammeters, two clamps are connected to the rail leads of the choke transformer, and test data is obtained by manual observation and recording. A single clamp-on ammeter can only measure the current of a single rail; when using two clamp-on ammeters, due to differences in the technical condition of the two devices and the reaction time of manual reading, the error is relatively large, and only the total current in the rail can be measured, without filtering out the current component of the track circuit signal.

[0021] Example 1:

[0022] The embodiments of this utility model relate to an unbalanced current monitoring system, such as... Figure 1 As shown, it includes: detection unit 1 and data terminal 2.

[0023] The detection unit 1 is connected to the hollow coil of the target track circuit section and is used to collect the unbalanced current of the target track circuit section, wherein the target track circuit section is the track circuit section that needs to be monitored.

[0024] Because an electrically isolated frequency-shifting track circuit is used, the unbalanced current flows through the air-core coil and then couples to the transmitting or receiving equipment, thus creating interference. Therefore, the unbalanced current can be directly detected at the location of the air-core coil. Thus, in this application, when collecting the unbalanced current, a single device can be directly connected to the location of the air-core coil to detect the unbalanced current. This avoids the problems in the prior art where a single ammeter cannot obtain the unbalanced current, and the inaccurate measurements caused by differences in the technical condition of two ammeters.

[0025] like Figure 2As shown, the detection unit 1 includes: a current sensor 3, a power supply module 10, an energy-saving module 9, a signal conditioning module 4, an A / D conversion module 5, a digital signal processing module 6, a local storage module 7, and a wireless communication module 8.

[0026] The current sensor 3 is connected to the hollow coil and is used to collect the unbalanced current passing through the idle coil. In this application, the current sensor 3 is connected to the hollow coil using a clamp connection method, as shown in Figure 3. The current sensor 3 includes a clamp 11 and a Hall sensor 12. The clamp 11 is used to connect the detection unit 1 to the hollow coil. The clamp 11 is a magnet with an insulating layer coated on its surface. A Hall sensor 12 is disposed between the two magnets at the tail of the clamp 11. The unbalanced current in the hollow coil causes a change in magnetic flux in the magnets of the clamp 11, thereby causing the Hall sensor 12 to detect the current. The Hall sensor 12 is electrically connected to the energy-saving module 9 and the signal conditioning module 4. The detection unit 1 also includes current sensors 3 with different ranges, all of which are connected to the hollow coil.

[0027] Since the inside of the clamp 11 is a magnet, when there is current in the idle coil, the magnetic flux inside the clamp 11 will change due to electromagnetic induction, which will affect the Hall sensor 12 between the two magnets, causing the Hall sensor 12 to generate an induced current. The current sensor 3 has undergone electrical-magnetic-electrical insulation and isolation conversion, which ensures the equipment safety of the detection unit 1, while also accurately detecting the unbalanced current in the hollow coil.

[0028] The energy-saving module 9 is connected to the current sensor 3 and is used to wake up the electrical components of the detection unit 1 when the current collected by the current sensor 3 is greater than a threshold. The signal conditioning module 4 is connected to the current sensor 3 and uses an electromagnetic coupling isolation circuit to achieve input protection. The A / D conversion module 5 is connected to the signal conditioning module 4 and electrically connected to the energy-saving module 9, and is used to perform digital-to-analog conversion on the signal output by the signal conditioning module 4. The digital signal processing module 6 is connected to the A / D conversion module 5 and electrically connected to the energy-saving module 9, and is used to process the digital signal output by the A / D conversion module 5. The core processor of the digital signal processing module 6 is a TI-DSP-F28335. The local storage module 7 is connected to the digital signal processing module 6 and electrically connected to the energy-saving module 9, and is used to store the processing results of the digital signal processing module 6. The wireless communication module 8 is electrically connected to the digital processing module and communicatively connected to the data terminal 2, and is used to send the processing results of the digital signal processing module 6 to the data terminal 2. The power module 10 is electrically connected to the A / D conversion module 5, the digital signal processing module 6, the storage module, and the wireless communication module 8.

[0029] The power module 10 includes a charging module, a battery, and a voltage regulator module. The charging module is electrically connected to the battery and is used to charge the battery. The voltage regulator module is electrically connected to the battery and is used to supply power to the various components of the detection sub-unit 1.

[0030] In this application, to improve the working time of the detection unit 1 and considering its portability, as well as the fact that the unbalanced current in the track circuit area being detected is not always present and that laying wiring next to the track is difficult, an energy-saving module 9 is also included in the detection unit 1. Normally, if no unbalanced current is detected or the value of the unbalanced current is less than a threshold, the entire detection unit 1 is in a sleep state. When an unbalanced current exceeding the threshold is detected, the energy-saving module 9 will wake up the various electrical components of the detection unit 1, allowing the detection unit 1 to have a longer working time without the need for additional circuitry. Of course, there are many ways to implement the energy-saving module 9 in the prior art, and it does not necessarily need to be controlled by a computer program. For example, a transistor can be designed in the energy-saving module 9, and the current sensor 3 can be connected to the base of the transistor, so that the conduction or shutdown of the transistor is affected by the magnitude of the unbalanced current, thereby waking up and putting the various electrical components of the detection unit 1 into sleep mode.

[0031] Furthermore, the detection unit 1 of this application can record the magnitude of the unbalanced current in real time during operation and send the result to the data terminal 2. This solves the problem of the existing technology requiring someone to stay at the detection point, which consumes a lot of human resources. It also solves the error and delay problems of manual recording of readings. Moreover, it can achieve detection for a longer period of time, making the detection results more accurate and greatly improving the safety of the track circuit.

[0032] The data terminal 2 is connected to the detection sub-unit 1 via a dedicated wireless network and is used to acquire the unbalanced current data collected by the detection sub-unit 1. The data terminal 2 includes: a data receiving module, a first display module, a second display module, and a data analysis module.

[0033] The data receiving module is communicatively connected to the detection unit 1. The first display module is connected to the data receiving module and is used to display the data received by the data receiving module. The data analysis module is connected to the data receiving module and is used to analyze and process the data received by the data receiving module according to a preset algorithm. The second display module is connected to the data analysis module and is used to display the analysis results of the data analysis module.

[0034] The data terminal 2 in this application has the ability to analyze and process the data detected by each sub-unit. By processing the received data through the data terminal 2, the computational burden during unbalanced current detection is greatly reduced, data processing efficiency is improved, problems can be detected in a timely manner, and the safety of the track circuit is significantly enhanced.

[0035] It should be understood that the terms "mechanism," "device," "component," etc., used in this application are merely one method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they can be replaced by other expressions.

[0036] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention. In practical applications, the technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification, and various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A monitoring system for unbalanced current, characterized in that, include: Detection of extension units and data terminals; The detection unit is connected to the hollow coil of the target track circuit section to collect the unbalanced current of the target track circuit section, wherein the target track circuit section is the track circuit section that needs to be monitored. The data terminal is connected to the detection unit via a dedicated wireless network and is used to acquire unbalanced current data collected by the detection unit.

2. The system according to claim 1, characterized in that, The detection unit includes: a current sensor, a power supply module, an energy-saving module, a signal conditioning module, an A / D conversion module, a digital signal processing module, a local storage module, and a wireless communication module; The current sensor is connected to the hollow coil and is used to collect the unbalanced current passing through the idle coil; The energy-saving module is connected to the current sensor and is used to wake up each power-consuming component of the detection unit when the current collected by the current sensor is greater than the threshold. The signal conditioning module is connected to the current sensor and uses an electromagnetic coupling isolation circuit to achieve input protection; The A / D conversion module is connected to the signal conditioning module and electrically connected to the energy-saving module, and is used to perform digital-to-analog conversion on the signal output by the signal conditioning module. The digital signal processing module is connected to the A / D conversion module and electrically connected to the energy-saving module, and is used to process the digital signal output by the A / D conversion module; The local storage module is connected to the digital signal processing module and electrically connected to the energy-saving module, and is used to store the processing results of the digital signal processing module; The wireless communication module is electrically connected to the digital signal processing module and communicatively connected to the data terminal, and is used to send the processing results of the digital signal processing module to the data terminal. The power supply module is electrically connected to the A / D conversion module, the digital signal processing module, the storage module, and the wireless communication module.

3. The system according to claim 2, characterized in that, The current sensor includes: a clamp and a Hall sensor; The clamp is used to connect the detection unit to the hollow coil; The clamp is a magnet with an insulating layer coated on its surface; A Hall sensor is installed between the two magnets at the tail of the fixture. The unbalanced current in the hollow coil will cause a change in the magnetic flux of the magnets in the fixture, which will then cause the Hall sensor to detect the current. The Hall sensor is electrically connected to the energy-saving module and the signal conditioning module.

4. The system according to claim 2, characterized in that, The power module includes: a charging module, a storage battery, and a voltage regulator module; The charging module is electrically connected to the battery and is used to charge the battery. The voltage regulator module is electrically connected to the battery and is used to supply power to the various components of the detection unit.

5. The system according to claim 1, characterized in that, The data terminal includes: a data receiving module, a first display module, a second display module, and a data analysis module; The data receiving module is communicatively connected to the detection unit; The first display module is connected to the data receiving module and is used to display the data received by the data receiving module; The data analysis module is connected to the data receiving module and is used to analyze and process the data received by the data receiving module according to a preset algorithm. The second display module is connected to the data analysis module and is used to display the analysis results of the data analysis module.

6. The system according to claim 2, characterized in that, The detection unit also includes current sensors with different ranges, all of which are connected to an air coil.

7. The system according to claim 2, characterized in that, The core processor of the digital signal processing module is a TI-DSP-F28335.

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