Electrified railway traction backflow acquisition system

Abstract

The utility model belongs to the technical field of railway electrification, and discloses an electrified railway traction backflow acquisition system, which comprises a data acquisition terminal, an acquisition control module, a communication module and a control terminal, and the data acquisition terminal comprises three data acquisition modules; the three data acquisition modules are respectively used for backflow data of a traction station, a partition station and an AT station; each data acquisition module comprises four current transformers, a Hall sensor and a high-frequency filter circuit; the four current transformers are respectively arranged in a contact line, a steel rail, a grounding grid and a backflow bus; the output end of the current transformer is connected with the acquisition control module through a Hall sensor and a high-frequency filter circuit in sequence, and transmits acquired data to the acquisition control module; and the acquisition control module sends acquisition backflow to the control terminal through the communication module. According to the utility model, synchronous high-precision acquisition of current information at multiple places can be realized, and multi-place reply information interaction is realized.

Description

Technical Field

[0001] This utility model belongs to the field of railway electrification technology, specifically relating to an electrified railway traction return current acquisition system. Background Technology

[0002] As a core component ensuring the safety of facilities within electrified railway traction substations, the grounding grid not only rapidly discharges fault current and improves the substation's ground potential distribution, but also provides a return path for traction ground current. Grounding safety is of paramount importance to the entire electrified railway traction power supply system. Therefore, it is necessary to conduct further research on the safety evaluation technology for the grounding return status of the traction power supply system.

[0003] Current traction backflow detection methods mostly involve power outages and excavation, requiring on-site inspections by monitoring personnel. This consumes significant manpower and resources, and lacks simultaneous data collection from multiple stations, hindering information exchange between stations and potentially resulting in missing crucial information in the collected backflow data. Therefore, proposing a novel traction backflow data acquisition system for electrified railways is urgently needed to improve system performance and upgrade its functionality. Utility Model Content

[0004] To address the shortcomings of existing traction return current data acquisition technologies, this invention provides an electrified railway traction return current acquisition system. By synchronously and with high precision acquiring current information from multiple stations and locations, it enables the interaction of traction return current information between multiple stations, achieving integrated acquisition of traction return current data from multiple stations.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: an electrified railway traction return flow acquisition system, including a data acquisition terminal, an acquisition control module, a communication module, and a control terminal. The data acquisition terminal includes three data acquisition modules; the three data acquisition modules are respectively used for the return flow data of traction depots, section depots, and AT depots.

[0006] Each data acquisition module includes four current transformers, a Hall sensor, and a high-frequency filter circuit. The four current transformers are respectively installed in the contact wire, rail, grounding grid, and return bus, and are used to detect the contact wire current, rail return current, ground return current, and return bus current, respectively. The output terminals of the current transformers are connected to the acquisition control module in sequence through the Hall sensor and the high-frequency filter circuit, and the acquired data is sent to the acquisition control module. The acquisition control module sends the acquired return current to the control terminal through the communication module.

[0007] The control terminal includes indicator lights, a display module, a data processing module, and a data storage module. The indicator lights, display module, and data storage module are all connected to the data processing module.

[0008] The control terminal also includes a GPS module, which is connected to the data processing module and is used to synchronize monitoring data from different monitoring points.

[0009] The electrified railway traction return flow acquisition system includes multiple data acquisition terminals, which are used to collect return flow data from multiple different monitoring points, including traction depots, section depots, and AT depots.

[0010] The acquisition and control module includes an AD conversion module, a DSP unit, and a data processing unit; the DSP unit is used to receive the digital signal converted by the AD conversion module, process it, and then send it to the control terminal through the communication unit.

[0011] The acquisition and control module also includes a reset unit, which is used to reset the DSP unit.

[0012] The acquisition and control module also includes a RAM unit, which is used to provide external storage space for the DSP unit.

[0013] The communication unit is a PLC unit, which is connected to the control terminal via the TCP / IP protocol.

[0014] Compared with the prior art, this utility model has the following advantages: This utility model provides an electrified railway traction return current acquisition system, which can synchronously and accurately acquire current information from multiple locations, and realize the return current information exchange between multiple railway power supply stations. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of an electrified railway traction return current acquisition system provided for an embodiment of this utility model;

[0016] Figure 2 This is a schematic diagram of the data acquisition module in an embodiment of the present invention;

[0017] Figure 3 This is a circuit connection diagram of the data acquisition module in an embodiment of the present invention;

[0018] Figure 4 This is a circuit connection diagram of the current transformer of the data acquisition module in an embodiment of this utility model;

[0019] Figure 5 This is a schematic diagram of the data processing system architecture according to an embodiment of the present utility model;

[0020] Figure 6 This is a circuit diagram of the acquisition and control module in an embodiment of this utility model;

[0021] Among them, 01 is the traction substation, 02 is the sectioning substation, 03 is the AT substation, 11 is the data acquisition module, 14 is the indicator light, 15 is the display module, 16 is the data processing module, 17 is the data storage module, 18 is the GPS module, 21 is the traction line current, 22 is the suction line current, 23 is the rail return current, 24 is the ground return current, 25 is the grounding grid, and 26 is the return bus current. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] like Figure 1 As shown, this embodiment of the invention provides an electrified railway traction return flow acquisition system, including a data acquisition terminal, an acquisition control module 13, a communication module, and a control terminal 16 connected in sequence. The data acquisition terminal includes three data acquisition modules 11; the three data acquisition modules 11 are respectively used for return flow data from traction depots, section depots, and AT depots.

[0024] like Figure 2 and Figure 3 As shown, in this embodiment, each data acquisition module 11 includes four current transformers, a Hall sensor, and a high-frequency filter circuit. The four current transformers are respectively installed in the contact wire 21, rail 23, grounding grid 24, and return bus 26, and are used to detect the contact wire current, rail return current, ground return current, and return bus current, respectively. The output terminals of the current transformers are connected to the acquisition control module 13 in sequence through the Hall sensor and the high-frequency filter circuit, and the acquired data is sent to the acquisition control module 13. The acquisition control module 13 sends the acquired return current signal to the control terminal through the communication module. The acquisition control module 13 processes multiple channels of data from multiple traction substations 01, section substations 02, and AT substations 03 at different locations in real time, and integrates the data before sending it to the data processing module 16.

[0025] In this embodiment, a small current signal generated by the current transformer is matched with the operating current of the selected Hall sensor. Through conversion of electric field signal to magnetic field signal and back to electric field signal, the required Hall sensor output signal is generated. Since the Hall sensor itself undergoes two electromagnetic changes, it may generate a large high-frequency signal, which needs to be shielded by a filtering circuit to block high-frequency interference. The generated measurement signal is input to the A / D analog-to-digital converter module to generate the measurement waveform. For example... Figure 4The diagram shows the circuit schematic of a current transformer. Rs on the right is the sampling resistor, and Vi is connected to the subsequent circuit through the current acquisition line.

[0026] Preferably, the current transformer used is a miniature precision AC current transformer (TA1015-1) with a transformation ratio of 5A:5mA. The current acquisition circuit corresponding to the current transformer includes a power resistor and a sampling resistor. The secondary side of the current transformer cannot be open-circuited; the design considers a margin that allows it to operate even under short-circuit current. Taking into account the requirements of the signal conditioning circuit, the sampling resistor Rs is 1000Ω, and the power resistor is 88kΩ.

[0027] Furthermore, such as Figure 1 As shown, in this embodiment, the control terminal includes an indicator light 14, a display module 15, a data processing module 16, and a data storage module 17. The indicator light 14, the display module 15, and the data storage module 17 are all connected to the data processing module 16.

[0028] Furthermore, such as Figure 1 As shown, the control terminal also includes a GPS module 18, which is connected to the data processing module 16 and is used to synchronize monitoring data from different monitoring points.

[0029] Furthermore, such as Figure 5 As shown in this embodiment, an electrified railway traction return current acquisition system includes multiple data acquisition terminals. These terminals are used to collect return current data from multiple different monitoring points, including traction substations, section substations, and AT substations. The control terminals at each monitoring point transmit measurement data to a public network server via communication modules. The host data processing module in the control terminal accesses the internet via a 4G network card and downloads current data from the server. Simultaneously, the data source is verified and time synchronization is achieved via a data acquisition card containing a GPS chip. The GPS module 18 includes a data acquisition board, a GPS / BeiDou chip, and a satellite antenna.

[0030] In this embodiment, the data processing module retrieves data from the server via a network card, extracts the data source location information via a GPS module, and restores the data in the waveform acquisition tool software on the host computer to extract key electrical parameters. Furthermore, the waveform data processed by the data processing module is output to the display module for display and stored in the data storage module. Staff can switch between displayed data via an interactive screen on the display module and access the current waveform data stored in the data storage module via the interactive screen. The data processing module has multiple functions to meet the requirements of traction return current acquisition; it can configure the rated value of the acquired power and transform the acquired secondary values ​​into primary values ​​through linear transformation; it can configure channel attributes, allowing configuration of monitoring points and channel attributes according to actual site conditions; it can simultaneously process 16 channels of sampled waveforms, providing waveform recording and analysis tools for viewing and analyzing waveform data via the display module 15; waveform data can be stored via the data storage module 17, with each stored waveform file forming a new file every 10 minutes, which can be distributed and analyzed offline; it can synchronize the waveform recordings of multiple monitoring points via the satellite antenna in the GPS module 18; and it can indicate the working, synchronization, and storage modes via the indicator light 14. It can provide real-time data storage and offline data export functions. The display module 15 can realize screen interaction and display the electrical quantity information of each sampling channel, including RMS value, angle, frequency, harmonics, etc.; the current sampling value and status of the system can be viewed in real time through remote software.

[0031] Furthermore, such as Figure 6 As shown, in this embodiment, the acquisition and control module includes an AD conversion module and a DSP unit. The DSP unit receives the digital signals converted by the AD conversion module, processes them, and then sends them to the control terminal through the communication unit. Each data acquisition module can acquire four channels of current data. Then, the three data acquisition modules convert the data through three AD converters. Thus, the DSP unit can receive and process 12 channels of current data digital signals, organize them, and send them to the public network server.

[0032] Furthermore, in this embodiment, the acquisition control module further includes a reset unit, which is used to reset the DSP unit. The reset unit generates a reset signal input / output terminal, which is connected to the reset input / output terminal of the DSP unit, so as to restart the program when an infinite loop occurs in the program of the DSP unit. The acquisition control module also includes a RAM unit, which is used to provide external storage space for the DSP unit.

[0033] Furthermore, in this embodiment, the communication unit is a PLC unit, which connects to the control terminal via the TCP / IP protocol. The PLC unit is mainly responsible for organizing the data processed by RAM. It uses the TCP / IP protocol and connects to an external host via a local area network for further analysis and storage. The communication input / output ports of the PLC unit are connected to the input / output ports of the control terminal.

[0034] Specifically, in this embodiment, the acquired current waveform data includes acquisition point location data and time-scale data, enabling synchronous calibration. The system's host computer can configure time attributes and acquisition point channel attributes. Important electrical parameters, including harmonics, angle, frequency, and RMS value, can be extracted from the acquired current waveform in real time. Channel information can be locally stored at set time intervals, and historical data can be queried and statistically analyzed.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A traction return current acquisition system for electrified railways, characterized in that, It includes a data acquisition terminal, an acquisition control module, a communication module, and a control terminal, wherein the data acquisition terminal includes three data acquisition modules; The three data acquisition modules are used for the return data from the traction station, the section station, and the AT station, respectively; Each data acquisition module includes four current transformers, a Hall sensor, and a high-frequency filter circuit. The four current transformers are respectively installed in the contact wire (21), rail (23), grounding grid (24), and return bus (26) to detect the contact wire current, rail return current, ground return current, and return bus current, respectively. The output terminals of the current transformers are connected to the acquisition control module in sequence through the Hall sensor and the high-frequency filter circuit to send the acquired data to the acquisition control module. The acquisition and control module sends the acquired data back to the control terminal via the communication module.

2. The electrified railway traction return current acquisition system according to claim 1, characterized in that, The control terminal includes an indicator light (14), a display module (15), a data processing module (16), and a data storage module (17), all of which are connected to the data processing module (16).

3. The electrified railway traction return current acquisition system according to claim 2, characterized in that, The control terminal also includes a GPS module (18), which is connected to the data processing module (16) and is used to synchronize monitoring data from different monitoring points.

4. The electrified railway traction return current acquisition system according to claim 1, characterized in that, It includes multiple data acquisition terminals, which are used to collect return data from multiple different monitoring points, including traction stations, section stations, and AT stations.

5. The electrified railway traction return current acquisition system according to claim 1, characterized in that, The acquisition and control module includes an AD conversion module, a DSP unit, and a data processing unit; the DSP unit is used to receive the digital signal converted by the AD conversion module, process it, and then send it to the control terminal through the communication module.

6. The electrified railway traction return current acquisition system according to claim 5, characterized in that, The acquisition and control module also includes a reset unit, which is used to reset the DSP unit.

7. The electrified railway traction return current acquisition system according to claim 5, characterized in that, The acquisition and control module also includes a RAM unit, which is used to provide external storage space for the DSP unit.

8. The electrified railway traction return current acquisition system according to claim 5, characterized in that, The communication module is a PLC unit, which is connected to the control terminal via the TCP / IP protocol.

Images