Testing device for locomotive DC600V power supply system

Abstract

The utility model discloses a testing device for a locomotive DC600V power supply system, which integrates a power supply, an external interface, a display screen, a control key and a testing circuit in a shell, realizes the integration of various testing functions, remarkably reduces the frequency of replacing equipment in the testing process, improves the testing efficiency and reduces the testing cost. Maintenance personnel can complete multiple test tasks without switching among multiple devices, meanwhile, the integrated design reduces the test cost, reduces the number of devices, provides multiple interface types for external interfaces, can be connected with external devices and simulate different test conditions, so as to adapt to multiple test scenes, comprehensively evaluate the performance of the DC600V power supply system, and improve the test efficiency of the DC600V power supply system. The display screen visually displays key parameters such as an output voltage value, the operation convenience is improved, the test error is reduced, the control key is convenient for a maintainer to control the power supply to start and adjust the output voltage, different test requirements are met, and the actual operation condition is more accurately simulated.

Description

Technical Field

[0001] This utility model relates to the field of DC600V power supply system testing technology, and in particular to a testing device for DC600V power supply systems of locomotives and rolling stock. Background Technology

[0002] With the rapid development of modern transportation, locomotives and rolling stock, as important means of transportation, have received increasing attention for their operational safety and reliability. As the core component of the train's power source, the stability of the DC600V power supply system of locomotives and rolling stock directly affects the normal operation of the train and the safety of passengers.

[0003] In the daily maintenance and repair of locomotives and rolling stock, testing the various performance aspects of the DC600V power supply system is an essential step. Traditional testing methods often rely on multiple independent testing devices. These devices are not only limited in function but also complex to operate, requiring maintenance personnel to possess high levels of professional skills and extensive practical experience. Furthermore, the lack of effective integration between different test items leads to a cumbersome and inefficient testing process, which is prone to introducing human error and affecting the accuracy of test results. Specifically, in the testing of the DC600V power supply system of locomotives and rolling stock, PLC overvoltage protection testing, PLC leakage alarm testing, DC600V trunk line insulation simulation testing of the first and last cars, and DC600V overcurrent protection simulation testing are four key test items. However, existing testing equipment often can only test one or a few of these test items, failing to achieve integration and automation of multiple test items. This not only increases the workload of maintenance personnel but also reduces testing efficiency and increases testing costs. Utility Model Content

[0004] In view of this, the present invention proposes a testing device for a DC600V power supply system of locomotives and rolling stock, which can solve the defects of low testing efficiency, low testing accuracy and high testing cost in the existing technology.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A testing device for a DC600V power supply system of locomotives and rolling stock includes a housing, a power supply, an external interface, a display screen, control buttons, and a testing circuit. The power supply and testing circuit are respectively installed inside the housing. The external interface, display screen, and control buttons are installed on the housing. The testing circuit is electrically connected to the power supply, external interface, display screen, and control buttons, and is used to perform PLC overvoltage protection testing, PLC leakage alarm testing, DC600V trunk line insulation simulation testing for the first and last cars, and DC600V overcurrent protection simulation testing. The external interface provides multiple interfaces for connecting external devices and simulating different test conditions. The display screen displays the output voltage value of the testing device. The control buttons control the power supply startup of the testing device and adjust the output voltage to meet different test requirements.

[0007] As a further optional solution for the test device for the DC600V power supply system of locomotives and rolling stock, the external interface includes an overvoltage test simulation voltage interface and a grounding protection test interface. The overvoltage test simulation voltage interface is used to connect external equipment to simulate the voltage output required for the overvoltage test, and the grounding protection test interface is used to provide grounding protection test interfaces with different resistance values ​​to simulate grounding protection tests under different resistance conditions.

[0008] As a further optional solution for the test device for the DC600V power supply system of locomotives and rolling stock, the control buttons include a voltage start button, a boost button, and a buck button. The voltage start button is used to start the power supply of the test device and put the device into working state. The boost button and buck button are used to adjust the output voltage of the voltage regulator to adapt to the voltage requirements under different test needs.

[0009] As a further optional embodiment of the test device for the DC600V power supply system of locomotives and rolling stock, the test circuit includes a voltage regulator and resistor components with different resistance values. The overvoltage test simulation voltage interface is electrically connected to the voltage regulator. The grounding protection test interface is electrically connected to the voltage regulator through resistor components with different resistance values. The voltage start button, boost button, and buck button are electrically connected to the voltage regulator.

[0010] As a further optional solution for the test device for the DC600V power supply system of locomotives and rolling stock, the display screen, voltage start button, boost button and buck button are respectively installed on the front surface of the housing, and the overvoltage test simulation voltage interface and grounding protection test interface are installed on the side of the housing.

[0011] The beneficial effects of this utility model are as follows: By integrating the power supply, external interface, display screen, control buttons, and test circuit into a single housing, this testing device achieves the integration of multiple testing functions. This design reduces the number of times equipment needs to be changed during testing, significantly improving testing efficiency. Maintenance personnel can complete multiple testing tasks, such as PLC overvoltage protection testing, PLC leakage alarm testing, DC600V trunk line insulation simulation testing for the first and last vehicles, and DC600V overcurrent protection simulation testing, without switching between multiple devices. Simultaneously, the integrated design reduces the number of testing devices, thereby lowering testing costs. The external interface provides multiple interface types for connecting external devices and simulating different test conditions. This design allows the testing device to adapt to various testing scenarios and meet different testing needs. For example, different load conditions and fault scenarios can be simulated through different interface connections, thus providing a more comprehensive evaluation of the performance of the DC600V power supply system. The display screen shows key parameters of the testing device, such as the output voltage, allowing maintenance personnel to monitor voltage changes in real time during testing. This intuitive display improves operational convenience and reduces testing errors caused by misreading or missing data. It also helps maintenance personnel adjust test parameters promptly, ensuring accurate test results. The control buttons allow maintenance personnel to easily control the power supply and adjust the output voltage to meet different testing needs. This flexibility enables the testing device to adapt to personalized requirements in various testing scenarios, such as adjusting test voltage and test time. Through flexible control, it can more accurately simulate various situations in actual operation, thereby more accurately evaluating the performance of the DC600V power supply system. The testing device has a simple structure and is easy to operate, requiring minimal practical skills from maintenance personnel. This allows them to quickly master the use of the testing device and improve work efficiency. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of a test device for a DC600V power supply system of locomotives and rolling stock according to the present invention.

[0014] Figure 2 This is a left view of a test device for a DC600V power supply system of locomotives and rolling stock according to the present invention.

[0015] Figure 3This is a rear view of a test device for a DC600V power supply system of locomotives and rolling stock according to the present invention.

[0016] Figure 4 This is a circuit diagram of the test circuit in this utility model;

[0017] Explanation of reference numerals in the attached diagram: 1. Housing; 2. Display screen; 3. Overvoltage test simulation voltage interface; 4. Grounding protection test interface; 5. Voltage start button; 6. Boost button; 7. Buck button. Detailed Implementation

[0018] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. 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.

[0019] refer to Figures 1 to 4 A testing device for a DC600V power supply system of locomotives and rolling stock includes a housing 1, a power supply, an external interface, a display screen 2, control buttons, and a testing circuit. The power supply and testing circuit are respectively installed inside the housing 1. The external interface, display screen 2, and control buttons are installed on the housing 1. The testing circuit is electrically connected to the power supply, external interface, display screen 2, and control buttons, and is used to realize PLC overvoltage protection testing, PLC leakage alarm testing, DC600V trunk line insulation simulation testing of the first and last cars, and DC600V overcurrent protection simulation testing. The external interface is used to provide multiple interfaces for connecting external devices and simulating different test conditions. The display screen 2 is used to display the output voltage value of the testing device. The control buttons are used to control the power supply start-up of the testing device and adjust the output voltage to meet different test requirements.

[0020] In this embodiment, by integrating the power supply, external interface, display screen 2, control buttons, and test circuit into a single housing 1, the testing device achieves integrated testing functions. This design reduces the number of times equipment needs to be changed during testing, significantly improving testing efficiency. Maintenance personnel can complete multiple testing tasks, such as PLC overvoltage protection testing, PLC leakage alarm testing, DC600V trunk line insulation simulation testing for the first and last vehicles, and DC600V overcurrent protection simulation testing, without switching between multiple devices. Simultaneously, the integrated design reduces the number of testing devices, thereby lowering testing costs. The external interface provides multiple interface types for connecting external devices and simulating different test conditions. This design allows the testing device to adapt to various testing scenarios and meet different testing needs. For example, different load conditions and fault scenarios can be simulated through different interface connections, thereby more comprehensively evaluating the performance of the DC600V power supply system. The display screen... 2. This device displays key parameters such as the output voltage of the testing equipment, enabling maintenance personnel to monitor voltage changes during the testing process in real time. This intuitive display method improves operational convenience and reduces testing errors caused by misreading or missing data. It also helps maintenance personnel adjust test parameters promptly to ensure the accuracy of test results. The control buttons allow maintenance personnel to easily control the power supply of the testing equipment and adjust the output voltage to meet different testing needs. This flexibility allows the testing equipment to adapt to personalized needs in different testing scenarios, such as adjusting test voltage and test time. Through flexible control, it can more accurately simulate various situations in actual operation, thereby more accurately evaluating the performance of the DC600V power supply system. The testing equipment has a simple structure, is easy to operate, and requires minimal practical skills from maintenance personnel, allowing them to quickly master the use of the testing equipment and improve work efficiency.

[0021] Preferably, the external interface includes an overvoltage test simulation voltage interface 3 and a grounding protection test interface 4. The overvoltage test simulation voltage interface 3 is used to connect external devices to simulate the voltage output required for the overvoltage test, and the grounding protection test interface 4 is used to provide grounding protection test interfaces with different resistance values ​​to simulate grounding protection tests under different resistance conditions.

[0022] In this embodiment, by connecting to external devices through the overvoltage test simulation voltage interface 3, the voltage output required for overvoltage testing can be flexibly simulated. This means that the testing device can adapt to overvoltage test requirements of different specifications and standards without replacing the entire testing device or a large number of internal components, thereby improving the flexibility and adaptability of the test. By providing grounding protection test interfaces 4 with different resistance values, the testing device can simulate grounding protection tests under different resistance conditions. This design allows maintenance personnel to simulate various possible grounding fault conditions in actual operation, including high-impedance grounding and low-impedance grounding, thereby more comprehensively evaluating the performance and reliability of the grounding protection system. Through the integrated interface design, the testing device can quickly and accurately connect to external devices and simulate test conditions, reducing preparation time before testing and adjustment time during testing. At the same time, since it can simulate multiple test scenarios, the test results are closer to the actual situation, improving the accuracy and reliability of the test. In addition, there is no need to purchase test equipment separately for each test condition. Multiple test requirements can be met through a single testing device and diversified interface design, which greatly reduces the testing cost.

[0023] Preferably, the control buttons include a voltage start button 5, a boost button 6, and a buck button 7. The voltage start button 5 is used to start the power supply of the test device and put the device into working state. The boost button 6 and the buck button 7 are used to adjust the output voltage of the voltage regulator to adapt to the voltage requirements under different test needs.

[0024] In this embodiment, the power supply to the testing device can be quickly started by a simple button operation on the voltage start button 5, allowing the device to quickly enter the working state. This design reduces startup time, improves testing efficiency, and enables maintenance personnel to start testing work more quickly. The boost button 6 and buck button 7 allow maintenance personnel to flexibly adjust the output voltage of the voltage regulator according to actual testing needs. Whether high voltage is required for overvoltage testing or low voltage is required for other types of testing, it can be easily achieved through these two buttons. This flexibility allows the testing device to adapt to various testing scenarios, improving the adaptability and accuracy of testing. By precisely controlling the output voltage, maintenance personnel can ensure the consistency and repeatability of testing conditions, thereby improving testing accuracy. At the same time, this design also reduces testing errors caused by voltage fluctuations or instability, improving testing reliability. The design of the control buttons takes into account the ease of operation, allowing maintenance personnel to easily master and quickly operate the system. This simplified operation process design reduces the skill level requirements for maintenance personnel, reduces the complexity and error rate in the operation process, and improves work efficiency.

[0025] Preferably, the test circuit includes a voltage regulator and resistor components with different resistance values. The overvoltage test simulation voltage interface 3 is electrically connected to the voltage regulator. The grounding protection test interface 4 is electrically connected to the voltage regulator through resistor components with different resistance values. The voltage start button 5, the boost button 6, and the buck button 7 are electrically connected to the voltage regulator.

[0026] In this embodiment, through electrical connections with the overvoltage test simulation voltage interface 3, voltage start button 5, boost button 6, and buck button 7, the voltage regulator can precisely control the output voltage. This allows the testing device to simulate test scenarios under different voltage conditions, meeting various test requirements and improving the flexibility and accuracy of the test. The grounding protection test interface 4 is electrically connected to the voltage regulator through resistor components of different resistance values, enabling the testing device to simulate grounding protection tests under different resistance conditions. This design allows maintenance personnel to simulate various possible grounding fault situations in actual operation, thereby more comprehensively evaluating the performance and reliability of the grounding protection system. Through the electrical connection design, The testing device can automatically adjust the voltage and quickly simulate grounding protection conditions, reducing the time for manual intervention and adjustment, and improving testing efficiency. This design also helps to automate the testing process, reduce human error, and improve the accuracy and consistency of the tests. Through the electrical connection between the control buttons (voltage start button 5, boost button 6, and buck button 7) and the voltage regulator, maintenance personnel can easily control the power start and voltage adjustment of the testing device. This design simplifies the operation process, reduces operational difficulty, and enhances the user experience. Simultaneously, the display screen can show the output voltage value in real time, allowing maintenance personnel to intuitively understand the voltage changes during the testing process.

[0027] It should be noted that the resistor assembly includes a 3000Ω resistor, a 2500Ω resistor, and a 1400Ω resistor, which are electrically connected to the grounding protection test interface.

[0028] In addition, the test procedure for the test circuit includes:

[0029] PLC overvoltage protection test: First, disconnect the main circuit and control circuit of the integrated control cabinet. Remove A1 (or A2) and the corresponding AGND from the PLC. Connect one end of the connecting wire to the overvoltage test simulation voltage output port of the test device. Connect the "+" end of the output signal line to the V1 (or V2) terminal of the PLC, and the "-" end to the AGND terminal of the PLC. After ensuring that it is tightened correctly, press the voltage start button of the test device. Adjust the output simulation value of the test device to 8.0V using the voltage increase and voltage decrease buttons. Close the integrated control cabinet. With a DC110V control power supply, the integrated control cabinet touch screen displays the voltage between 590V and 610V for channel I (or channel II). Select the automatic position for the power conversion switch SA1, and select channel I (or channel II) power supply for the PLC. Then, perform a simulated overvoltage protection test: adjust the simulated output value of the test device to 8.8V. At this time, the display shows that the voltage of channel I (or channel II) is greater than 660V. The PLC automatically controls the disconnection of the power supply to channel I (or channel II), and the display shows the overvoltage fault information of the power bus of channel I (or channel II).

[0030] PLC leakage alarm test: Set the integrated control cabinet touch screen to 80mA. After powering off for 3 minutes, connect the connecting wire to the 2500Ω port of the test device. Connect the other end to the positive terminal and ground terminal (or negative terminal and ground terminal) of the passenger compartment electric heating output cage terminal in sequence. Close the passenger compartment electric heating switch to restore DC600V power supply. Set the passenger compartment electric heating conversion switch SA5 or the air conditioning mode selection switch SA6 to the half-heat position or the test warm position. Simulate a DC600V positive (or negative) line ground leakage current greater than 80mA for more than 1 second, and the protection circuit will activate. Using the same method, use the 3000Ω port of the test device to test. Simulate a leakage current less than 80mA for more than 30 seconds, and the protection circuit will not activate. Check the relevant information on the integrated control cabinet touch screen.

[0031] DC600V trunk line insulation simulation test for the first and last cars: Temporarily set the display screen of the test device and the DC600V online insulation monitoring device to 150mA. After powering off for 3 minutes, connect the connecting wire to the 1400Ω port. Connect the other end to the positive terminal and ground terminal (or negative terminal and ground terminal) of the passenger compartment electric heating output cage terminal in sequence. Then close the passenger compartment electric heating switch and restore the DC600V power supply. Set the passenger compartment electric heating conversion switch SA5 or the air conditioning condition selection switch SA6 to the half-heat position or the test warm position for more than 2 seconds. Check the relevant information on the touch screen of the bus (first and last cars) integrated control cabinet.

[0032] DC600V Overcurrent Protection Simulation Test: First, disconnect the main circuit and control circuit of the integrated control cabinet. Remove A3 and the corresponding AGND3 from the PLC. Connect the "+" terminal of the test fixture's output signal line to point V3 of the PLC, and the "-" terminal to the AGND3 terminal of the PLC. After ensuring that it is tightened correctly, adjust the output simulation value of the test fixture to 6.1V (9.7V is required for the catering car simulation test). Turn on the DC110V control power supply of the integrated control cabinet and turn the power conversion switch to the automatic position. After the main power supply contactor is engaged, the DC600V current display on the integrated control cabinet touch screen will exceed the set value (145A for catering cars and 90A for other car types) for more than 3 seconds. Check the fault information on the integrated control cabinet touch screen.

[0033] Preferably, the display screen 2, voltage start button 5, voltage boost button 6 and voltage buck button 7 are respectively installed on the front surface of the housing 1, and the overvoltage test simulation voltage interface 3 and grounding protection test interface 4 are installed on the side of the housing 1.

[0034] In this embodiment, the display screen 2, voltage start button 5, boost button 6, and buck button 7 are respectively installed on the front surface of the housing 1. This allows maintenance personnel to easily view the information on the display screen and simultaneously perform operations such as power-on and voltage adjustment. This design reduces eye movement and body movements during operation, improving convenience and efficiency. The overvoltage test simulation voltage interface 3 and grounding protection test interface 4 are installed on the side of the housing. This layout facilitates the connection of external devices and avoids mutual interference between the front operation area and the interface area. When connecting external devices, maintenance personnel do not need to move or obstruct the front display screen and control buttons, ensuring smooth and safe operation. By installing the display screen 2, control buttons, and external interfaces on different surfaces of the housing 1, the space of the housing 1 is rationally partitioned and utilized. This design allows the testing device to maintain a compact structure while meeting various operational and connection requirements, improving space utilization efficiency.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A testing device for a DC600V power supply system of locomotives and rolling stock, characterized in that, The device includes a housing (1), a power supply, an external interface, a display screen (2), control buttons, and a test circuit. The power supply and test circuit are installed inside the housing (1), and the external interface, display screen (2), and control buttons are installed on the housing (1). The test circuit is electrically connected to the power supply, external interface, display screen (2), and control buttons, and is used to perform PLC overvoltage protection testing, PLC leakage alarm testing, DC600V trunk line insulation simulation testing for the first and last vehicles, and DC600V overcurrent protection simulation testing. The external interface is used to provide multiple interfaces to connect external devices and simulate different test conditions. The display screen (2) is used to display the output voltage value of the test device. The control buttons are used to control the power supply of the test device and adjust the output voltage to meet different test requirements.

2. The testing device for a DC600V power supply system of locomotives and rolling stock according to claim 1, characterized in that, The external interface includes an overvoltage test simulation voltage interface (3) and a grounding protection test interface (4). The overvoltage test simulation voltage interface (3) is used to connect external devices to simulate the voltage output required for the overvoltage test. The grounding protection test interface (4) is used to provide grounding protection test interfaces with different resistance values ​​to simulate grounding protection tests under different resistance conditions.

3. A testing device for a DC600V power supply system of locomotives and rolling stock according to claim 2, characterized in that, The control buttons include a voltage start button (5), a boost button (6), and a buck button (7). The voltage start button (5) is used to start the power supply of the test device and put the device into working state. The boost button (6) and buck button (7) are used to adjust the output voltage of the voltage regulator to adapt to the voltage requirements under different test needs.

4. A testing device for a DC600V power supply system of locomotives and rolling stock according to claim 3, characterized in that, The test circuit includes a voltage regulator and resistor components with different resistance values. The overvoltage test simulation voltage interface (3) is electrically connected to the voltage regulator. The grounding protection test interface (4) is electrically connected to the voltage regulator through resistor components with different resistance values. The voltage start button (5), boost button (6), and buck button (7) are electrically connected to the voltage regulator.

5. A testing device for a DC600V power supply system of locomotives and rolling stock according to claim 4, characterized in that, The display screen (2), voltage start button (5), boost button (6) and buck button (7) are respectively installed on the front surface of the housing (1), and the overvoltage test simulation voltage interface (3) and grounding protection test interface (4) are installed on the side of the housing (1).

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