Subway stray current protection intelligent detection device

Abstract

The utility model discloses an intelligent detection device for subway stray current protection. The intelligent detection device comprises a measurement module, a power module, a laser range finder, an auxiliary test line and a cable, the measurement module is connected with a current drainage net terminal of the current drainage net through the auxiliary test line; the power module is electrically connected with the measuring module, the input end of the power module is connected with a direct-current power supply, and the output end of the power module is connected with a steel rail or a current drainage net terminal through a cable; and the laser range finder is electrically connected with the measurement module, is mounted near the current drainage net, and is used for measuring the length between the current drainage net terminals of the current drainage net and transmitting the length between the current drainage net terminals to the measurement module. The device can intelligently detect parameters of the rail return-flow system, calculate longitudinal resistance and transition resistance of the steel rail and output data reports, and is high in detection precision, high in efficiency and easy to popularize.

Description

Technical Field

[0001] This utility model relates to the field of longitudinal resistance and transition resistance measurement technology of track return system, specifically to an intelligent detection device for stray current protection in subways. Background Technology

[0002] my country's urban rail transit mainly uses DC traction power supply, which is beneficial for achieving continuous power supply to the main line traction network, avoiding problems such as negative sequence and high-frequency electromagnetic interference, and meeting the needs of frequent train entry and exit from stations and frequent braking and starting / stopping. However, the use of DC traction power supply in subway traction power supply systems can lead to stray current leakage problems.

[0003] The electrical energy output from the traction substation is transmitted to the train via the overhead contact line, and then returns to the traction substation via the running rails. This traction return current causes the running rails to generate a ground potential. In the track return system, due to the inherent impedance characteristics of the rails, complete insulation between the rails and the ground cannot be achieved through materials and construction techniques. Therefore, the return current leaks to the ground, returning to the traction substation through the subway's structural steel reinforcement and buried metal pipes, forming a current loop. This portion of the current leaking from the running rails to the ground is called stray current. The point where stray current flows out from the structural steel reinforcement or buried metal pipes is the anode zone, where the metal components will corrode. The rail transition resistance value is an important indicator for measuring the level of stray current leakage; the magnitude of the stray current is inversely correlated with the rail transition resistance value. Reducing the longitudinal resistance of the running rails can decrease the rail potential, thereby reducing stray current.

[0004] According to CTI / T 49-2020 "Technical Standard for Stray Current Corrosion Protection in Metro Lines," the rail transition resistance value of metro lines should not be less than 15 Ω·km. Testing whether the rail transition resistance meets the requirements is of great significance for engineering construction and metro structural safety. Both the national standards GB / T28026.2-2018 "Strray Current Protection" and CJJ / T 49-2020 "Technical Standard for Stray Current Corrosion Protection in Metro Lines" provide the measurement principles and recommended methods for the longitudinal resistance and transition resistance of rails. Specifically, current is injected between the rail to be tested and the stray current collection network terminals, and the inflow or outflow current is accurately measured at both ends of the rail transition resistance test section to obtain the current leaking from the rail to ground. The rail transition resistance of the test section can be calculated by dividing the average value of the rail-to-ground potential obtained from the sampling in the test section by the leakage current. Document CN 106771636A, "Rail Transition Resistance Detection System and Method," employs Internet of Things (IoT) technology to connect a server with data acquisition and communication equipment. After acquiring signals, it calculates the rail transition resistance and assesses the rail's insulation installation level. However, existing technologies generally suffer from drawbacks such as low measurement accuracy, limited measurement efficiency, and complex operation. Utility Model Content

[0005] To address the shortcomings of low detection accuracy, limited detection efficiency, and complex operation in the detection of parameters of the return track system, this experiment proposes a novel intelligent detection device for stray current protection in subways.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This application discloses an intelligent detection device for stray current protection in subways, comprising:

[0008] Measurement module, power module, laser rangefinder, auxiliary test leads, cables;

[0009] The measurement module is connected to the drain network terminal of the drain network via the auxiliary test line;

[0010] A power module is electrically connected to the measurement module. The input terminal of the power module is connected to a DC power supply, and the output terminal is connected to a rail or drain network terminal via a cable.

[0011] The laser rangefinder, electrically connected to the measurement module, is installed near the drainage network to measure the length between the terminals of the drainage network and transmit the length between the terminals to the measurement module.

[0012] In one embodiment, a lithium-ion rechargeable battery is also provided to power the measurement module.

[0013] In one embodiment, the measurement module has a housing and an industrial control computer located inside the housing. The outer surface of the housing is provided with a rail body voltage data acquisition port and a rail-to-drainage network voltage data acquisition port, both of which are electrically connected to the internal industrial control computer.

[0014] In one embodiment, the power module has a housing and a current / voltage stabilizer disposed within the housing. The outer surface of the housing is provided with a voltage / current adjustment knob, an input terminal, and an output terminal. The input terminal is a voltage input terminal, and the output terminal is a current output terminal.

[0015] In one embodiment, the measurement module and the power module transmit data via WIFI, and the measurement module interacts with the power module via a radio frequency antenna.

[0016] In one embodiment, a laser rangefinder measures the distance between two drain network terminals on the left and right sides of the same row, the two drain network terminals on the same row being connected by a cable;

[0017] The left drain grid terminal of any two rows is connected to the positive current output terminal of the power module by a cable, and the right drain grid terminal is connected to the negative current output terminal of the power module.

[0018] In one embodiment, the power module further includes a radio frequency antenna, a fan exhaust vent, and a voltage and current display screen, which are mounted on the housing of the power module.

[0019] In one embodiment, the measurement module further includes a test module panel switch, a power indicator light, an RF antenna, and a USB interface for the industrial control computer control display screen.

[0020] In one embodiment, the laser rangefinder has a long-distance measurement accuracy of ±2.0 mm, a typical measurement tolerance of ±3.0 mm, a typical range of 40 m / 130 ft, a laser class of II, a protection level of IP40, and a laser automatic shut-off time of 90 seconds.

[0021] In the above technical solution, the intelligent detection device for stray current protection in subways provided by this utility model has the following beneficial effects:

[0022] 1. This intelligent detection device can achieve high-precision and high-efficiency detection of the parameters of the track return system.

[0023] 2. After the intelligent detection device is connected and deployed, it intelligently completes the detection of the parameters of the track return system, the calculation of the longitudinal resistance and transition resistance of the rail, and the output of data reports.

[0024] 3. This intelligent detection device can detect the parameters of the track return current system, which is of great significance for the management of stray current in urban rail transit. It can effectively improve the operation and maintenance level of urban rail systems. It has a simple structure, is easy to use, and is easy to promote. Attached Figure Description

[0025] Figure 1 A schematic diagram illustrating the working principle of the system provided in this embodiment of the utility model;

[0026] Figure 2 A schematic diagram of the measurement module panel provided in an embodiment of this utility model;

[0027] Figure 3 A schematic diagram of the power module panel provided in an embodiment of this utility model.

[0028] Figure label:

[0029] 1. Test module panel switch; 2. Power indicator light; 3. 12V power input terminal; 4. Radio frequency antenna; 5. Industrial control computer display screen; 6. Rail body voltage data acquisition port; 7. 220V power input terminal; 8. USB interface; 9. Rail to drainage network voltage data acquisition port; 10. Fan exhaust port; 11. Voltage and current display screen; 12. Voltage and current adjustment knob; 13. Power input terminal; 14. Antenna; 15. Current output terminal; 16. Power module panel switch. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0031] Please see Figure 1 , Figure 2 , Figure 3 ,in: Figure 1 A schematic diagram illustrating the working principle of the intelligent detection device provided in this embodiment of the utility model; Figure 2 A schematic diagram of the measurement module panel provided in an embodiment of this utility model; Figure 3 A schematic diagram of the power module panel provided in an embodiment of this utility model.

[0032] Embodiments of this utility model provide an intelligent detection device for stray current protection in subways, such as... Figure 1 As shown. It includes: a measurement module, a power module, a laser rangefinder, an auxiliary test line, and a cable. The measurement module is connected to the drainage network terminals of the drainage network via the auxiliary test line. The power module is electrically connected to the measurement module. The input terminal of the power module is connected to a DC power supply, and the output terminal is connected to a steel rail or the drainage network terminals via a cable, which is a DC power cable. The laser rangefinder is electrically connected to the measurement module and is installed near the drainage network to measure the length between the drainage network terminals and transmit the length between the drainage network terminals to the measurement module.

[0033] The rail body voltage data acquisition port 6 or the rail-to-drainage network voltage data acquisition port 9 of the measurement module are connected to the test rail through the auxiliary test line. The positive and negative terminals of the current output terminal 15 of the power module are connected to the rail or drainage network terminal through the DC power cable. The frequency antenna 4 of the measurement module is connected to the power module. The lithium-ion rechargeable battery provides power to the measurement module.

[0034] like Figure 2 As shown, the measurement module includes a housing and an industrial control computer located inside the housing. The outer surface of the housing is provided with a test module panel switch 1, a power indicator light 2, a 12V power input terminal 3, an RF antenna 4, an industrial control computer control display screen 5, a rail body voltage data acquisition port 6, a 220V power input terminal 7, a USB interface 8, and a rail-to-drainage network voltage data acquisition port 9.

[0035] The rail body voltage data acquisition port 6 or the rail-to-drainage network voltage data acquisition port 9 of the measurement module are connected to the drainage network terminal of the adjacent drainage network through the auxiliary test line.

[0036] The measurement module is connected to the laser rangefinder via a data cable, and the length data between the drain network terminals measured by the laser rangefinder is transmitted to the measurement module via the data cable.

[0037] The power input terminal 3 of the measurement module is connected to a power supply, which is a 12V power supply. The measurement module has a current sensor, which is connected to an industrial control computer. The current sensor calculates the voltage and current between the drainage network terminals based on the length between the drainage network terminals, and then uploads the collected current information to the industrial control computer.

[0038] The rail body voltage data acquisition port 6, the rail-to-drainage network voltage data acquisition port 9, and the USB interface 8 are all electrically connected to the internal industrial control computer. The rail body voltage data acquisition port 6 and the rail-to-drainage network voltage data acquisition port 9 are connected to the sensor. The USB interface is used to connect an external mobile storage device to transfer the collected information in the industrial control computer to the mobile storage device. The USB interface type is such as Type-A, Type-B, or Type-C.

[0039] A lithium-ion rechargeable battery is electrically connected to the measurement module to power it.

[0040] like Figure 3 As shown, the power module has a housing and a current / voltage stabilizer disposed within the housing. The current / voltage stabilizer is used to regulate the input voltage or current. The input terminal is connected to a DC power supply, and the positive and negative terminals of the output terminal are connected to the rail or drain network terminal via a DC power cable.

[0041] The power module can adjust the magnitude and stability of the voltage or current. The adjusted current is input to the rail or drain network terminal through a DC power cable. The power module includes a fan exhaust vent 10, a voltage and current display screen 11, a voltage and current adjustment knob 12, a power input terminal 13, an antenna 14, a current output terminal 15 (with positive and negative terminals), and a power module panel switch 16. The voltage and current adjustment knob 12 has two settings: I and II. In constant current mode, when rotated to setting II, for example, the DC current is 100A.

[0042] The power module's input voltage is AC 220V±10%, 50Hz, with voltage stability less than 0.2%, current stability less than 0.5%, and load stability less than 0.5%. The power module can utilize a power analyzer, such as a multi-channel power analyzer or a three-phase power meter. The power module offers functions including constant current mode, AC mode, high-voltage mode, and low-voltage mode, such as DC-AC, AC-DC, low-voltage-high-voltage (LV-HV), or high-voltage-low-voltage (HV-LV).

[0043] The laser rangefinder is electrically connected to the measurement module. The laser rangefinder is used to measure the length between the terminals of the drainage network. The length between the terminals of the drainage network measured by the laser rangefinder is transmitted to the measurement module through a data cable. The long-distance measurement accuracy of the laser rangefinder is ±2.0mm, the typical measurement tolerance is ±3.0mm, the typical range is 40m / 130ft, the laser grade is II, the protection level is IP40, and the laser automatic shut-off time is 90 seconds.

[0044] The measurement module and the power module transmit data via WIFI, and the measurement module interacts with the power module via the RF antenna 4.

[0045] The positive terminal of the current output terminal 15 of the power module is connected to the first drain network terminal of the first row, and the drain network terminal is connected to the positive terminal of the rail body voltage data acquisition port 6 of the measurement module through the auxiliary test line;

[0046] The negative terminal of the current output terminal 15 of the power module is connected to the second drain network terminal of the first row. The second drain network terminal is connected to the negative terminal of the rail body voltage data acquisition port 6 of the measurement module through the auxiliary test line.

[0047] The positive terminal of the current output terminal 15 of the power module is connected to the third drain network terminal of the second row. The third drain network terminal is connected to the positive terminal of the drain network voltage data acquisition port 9 of the measurement module rail through an auxiliary test line.

[0048] The negative terminal of the current output terminal 15 of the power module is connected to the fourth drain network terminal of the second row, and the fourth drain network terminal is connected to the negative terminal of the rail-to-drain network voltage data acquisition port 9 of the measurement module.

[0049] The method for measuring the longitudinal resistance of the drainage network using Example 1 includes the following steps:

[0050] Click on the longitudinal resistance of the drainage network on the panel of the measurement module to enter the information entry interface and enter the information.

[0051] Power connection: Unscrew the cables connecting the drain network terminals of adjacent drain networks. Use a laser rangefinder to measure the distance between the left and right drain network terminals in the same row, and connect the left and right drain network terminals in the same row with a cable. Then connect the left drain network terminal of any two rows to the positive terminal of the current output terminal 15 of the power module with a cable, and connect the right drain network terminal on the other side of the same row to the negative terminal of the current output terminal 15 of the power module. The power connection is now complete.

[0052] Measurement wiring: Connect the drain network terminal connected to the positive terminal of the current output terminal 15 of the power module to the positive terminal of the rail-to-drain network voltage data acquisition port 6 of the measurement module via an auxiliary test lead. Connect the drain network terminal in the same row, which is connected to the negative terminal of the current output terminal 15 of the power module, to the negative terminal of the rail-to-drain network voltage data acquisition port 6 of the measurement module. Connect the drain network terminal in the other row, which is connected to the positive terminal of the current output terminal 15 of the power module, to the positive terminal of the rail-to-drain network voltage data acquisition port 9 of the measurement module via an auxiliary test lead. Connect the drain network terminal in the other row, which is connected to the negative terminal of the current output terminal 15 of the power module, to the negative terminal of the rail-to-drain network voltage data acquisition port 9 of the measurement module. With all test terminals connected, the measurement wiring is complete.

[0053] Data acquisition: Input the length between the drain network terminals measured by the laser rangefinder, and the measurement module will perform current I... off Voltage U RSoff During testing, the power switch was set to the ROMAN MERGEFORMAT I position. The current I at this setting... off After connecting the test terminals, the current sensor of the measurement module measures the current. At this time, no test current is injected into the system, and the voltage U is measured. RSoff To obtain rail voltage and noise data after connecting the test terminals, no test current is injected into the system at this point. After entering the data acquisition interface, click "Start Detection," and click "Save Data" when the data stabilizes. Acquisition will stop when the progress bar is full. off U RSoff Data acquisition complete; click Next on the data acquisition interface to return to the task selection interface and proceed with current I. on Voltage U RSon For testing, the power module should be turned on, the switch set to the ROMAN MERGEFORMATII position, and adjusted to constant current (CC) mode. It should receive a 100A input current and maintain stability. The current I at this point should be... on After connecting the test terminals, the current sensor of the measurement module measures the current data. At this point, the system has injected test current, and the voltage U is measured. Rson为接好测试端子后，测到的钢轨电压数据，此时系统已注入测试电流。

[0054] After the test is completed, return to the task selection interface. All tasks on the panel will turn green, indicating that data collection is complete. You can view the collected data and click to output the results to generate reports intelligently.

[0055] This novel experimental design enables high-precision and high-efficiency detection of track return system parameters. It is easy to use and can intelligently complete the detection of track return system parameters, the calculation of longitudinal and transition resistance of rails, and the output of data reports. It is easy to promote and has important significance for the management of stray currents in urban rail transit, and can effectively improve the operation and maintenance level of urban rail systems.

[0056] The above description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A subway stray current protection intelligent detection device, characterized in that, It comprises: a measurement module, a power module, a laser range finder, an auxiliary test line, a cable; the measurement module is connected with the drainage network terminal of the drainage network through the auxiliary test line; the power module is electrically connected with the measurement module, the input end of the power module is connected with the direct current power supply, and the output end is connected with the rail or the drainage network terminal through the cable; the laser range finder is electrically connected with the measurement module and is installed near the drainage network, used for measuring the length between the drainage network terminals of the drainage network and transmitting the length between the drainage network terminals to the measurement module.

2. The metro stray current protection intelligent detection device of claim 1, wherein, A lithium ion rechargeable battery is also provided to supply power to the measurement module.

3. The intelligent detection device for subway stray current protection according to claim 1, wherein the measurement module has a shell and an industrial computer in the shell, and the shell is provided with a rail body voltage data acquisition port and a rail-to-drainage network voltage data acquisition port, both of which are electrically connected with the industrial computer inside.

4. The intelligent detection device for subway stray current protection according to claim 3, wherein the power module has a shell and a current / voltage stabilizer arranged in the shell, and the shell is provided with a voltage and current adjusting knob, an input end and an output end, the input end is a voltage input end, and the output end is a current output end.

5. The intelligent detection device for subway stray current protection according to claim 1, wherein the measurement module and the power module transmit data through WIFI, and the measurement module and the power module realize data interaction through a radio antenna.

6. The intelligent detection device for subway stray current protection according to claim 4, wherein the laser range finder measures the distance between the left and right drainage network terminals of the same row, and the two drainage network terminals of the same row are connected by a cable; the left drainage network terminals of any two rows are connected with the positive pole of the current output end of the power module by a cable, and the right drainage network terminals are connected with the negative pole of the current output end of the power module.

7. The intelligent detection device for subway stray current protection according to claim 4, wherein the power module further has a radio antenna, a fan exhaust port and a voltage and current display screen, and the fan exhaust port and the voltage and current display screen are installed on the shell of the power module.

8. The intelligent detection device for subway stray current protection according to claim 3, wherein the measurement module further comprises a test module panel switch, a power indicator, a radio antenna, an industrial computer control display screen and a USB interface.

9. The metro stray current protection intelligent detection device according to claim 1, characterized in that, The long-distance measurement accuracy of the laser range finder is ±2.0mm, the typical measurement tolerance is ±3.0mm, the typical range is 40m / 130ft, the laser level is II, the protection level is IP40, and the laser automatic shutdown time is 90 seconds.

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