A mainline insulation testing device for passenger trains

Abstract

An insulation testing device for passenger train main lines, relating to the field of insulation testing technology, includes a housing, a control unit, a data monitoring unit, and a wireless transmission unit. The housing is installed on the outer side of the train main line power cabinet, and the control unit is installed inside the housing. The control unit includes a PLC and a human-machine interface (HMI), wherein the signal input terminal of the PLC is electrically connected to the data monitoring unit, and the signal output terminal of the PLC is electrically connected to the input terminal of the wireless transmission unit through the HMI. The data monitoring unit includes an insulation monitor and an ambient temperature and humidity monitor, the latter used to detect the temperature and humidity in the air surrounding the train main line. The signal output terminals of both the insulation monitor and the ambient temperature and humidity monitor are electrically connected to the signal input terminal of the PLC. The output terminal of the wireless transmission unit is connected to the signal in the central control room. This device addresses the problems of traditional insulation test results not being able to be stored for long periods and the poor accuracy of the test results.

Description

Technical Field

[0001] This utility model relates to the field of insulation testing technology, specifically to an insulation testing device for the main line of passenger trains. Background Technology

[0002] Before a passenger train leaves the depot, it must undergo preparation and maintenance power supply operations. Before powering on the passenger train, the main line insulation test must be performed. Only when the insulation parameters meet the maintenance requirements of the passenger train can the DC600V ground power supply of the passenger train supply power to the train to ensure the safety of the power supply equipment and the vehicle. Therefore, it is necessary to develop a DC600V train main line insulation ground monitoring device. Currently, insulation testing is mainly conducted using a megohmmeter, with data recorded manually. This method relies heavily on the skills and experience of the testing personnel, and has problems such as being time-consuming and labor-intensive, having large errors, not being able to archive data, and not being able to view train power supply information, which seriously endangers power supply safety. Chinese patent publication number (CN102565648A) discloses a DC600V trunk line online insulation detection device. It detects the insulation effect through a voltage sensor, records the detection results using a PLC, and finally displays them on a monitor. However, this device has drawbacks such as short data storage time, data being stored locally in the PLC, resulting in insufficient storage capacity, inability to detect train power supply related information in addition to insulation information, a small data monitoring range, and the lack of automatic atmospheric temperature and humidity judgment function.

[0003] Therefore, we propose a device that can accurately obtain the insulation test results of train main lines and extend the data storage time. Utility Model Content

[0004] The purpose of this invention is to provide an insulation testing device for main lines of passenger trains, which solves the problems of traditional insulation test results not being able to be stored for a long time and the poor accuracy of the test results.

[0005] This utility model is achieved through the following technical solution: An insulation detection device for a main line of a passenger train includes a housing, a control unit, a data monitoring unit, and a wireless transmission unit; The housing is installed on the outer side of the train mainline power cabinet, and a control unit and a data monitoring unit are installed inside the housing. The control unit includes a PLC and a human-machine interface, wherein the signal input terminal of the PLC is electrically connected to the data monitoring unit, and the signal output terminal of the PLC is electrically connected to the input terminal of the wireless transmission unit through the human-machine interface. The data monitoring unit includes an insulation monitor and an ambient temperature and humidity monitor. The insulation monitor is used to perform insulation tests on the train mainline, and the ambient temperature and humidity monitor is used to detect the humidity in the air where the train mainline is located. The signal output terminals of the insulation monitor and the ambient temperature and humidity monitor are both electrically connected to the signal input terminal of the PLC. The output of the wireless transmission unit is connected to the signal in the central control room.

[0006] Furthermore, the wireless transmission unit includes a wireless transmitting CPE and a wireless receiving CPE, wherein the wireless transmitting CPE is installed outside the housing and electrically connected to the human-machine interface, and the wireless receiving CPE is installed on the top of the building where the central control room is located and electrically connected to the central control room.

[0007] Furthermore, the PLC is a Delta DVP14SS211R model.

[0008] Furthermore, the housing is box-shaped, with one side of the housing fixedly connected to the outer side of the train mainline power cabinet via a docking mechanism, and a cabinet door on the front of the housing.

[0009] Furthermore, the docking mechanism includes a mounting plate and a positioning post, wherein the mounting plate abuts against the outer side of the train mainline power cabinet, and the outer side of the train mainline power cabinet is provided with a groove that corresponds to and cooperates with the positioning post.

[0010] Furthermore, the positioning post is hemispherical or square.

[0011] Furthermore, an observation window is provided on the surface of the cabinet door.

[0012] The technical solution of this utility model has at least the following advantages and beneficial effects: This utility model discloses an insulation testing device for the main line of a passenger train. Through the control unit, it can sequentially perform positive-to-ground insulation test, negative-to-ground insulation test and line-to-line insulation test on the main line of the train, and compare it with the train main line operation data obtained from the data monitoring unit to accurately determine the insulation performance of the train main line. In addition, using a wireless transmission unit to send the insulation test results of the train main line to the central control room for storage can improve the data storage time. In addition, the data monitoring unit can also monitor the temperature and humidity of the air along the train line, improving comprehensive monitoring of the train line. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the housing mounting structure of this utility model.

[0014] Reference numerals: 1. Housing; 11. Mounting plate; 12. Positioning post; 13. Observation window; 2. Control unit; 21. PLC; 22. Human-machine interface; 3. Data monitoring unit; 31. Insulation monitor; 32. Atmospheric temperature and humidity monitor; 4. Wireless transmission unit; 41. Wireless transmitting CPE; 42. Wireless receiving CPE; 5. Central control room; 6. Train mainline power cabinet. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] Example 1 As attached Figure 1 - Appendix Figure 2 The above-displayed mainline insulation detection device for passenger trains includes a housing, a control unit, a data monitoring unit, and a wireless transmission unit. The housing 1 is installed on the outer side of the train mainline power cabinet 6, and the housing 1 contains a control unit 2 and a data monitoring unit 3. Furthermore, the housing 1 is box-shaped, with dimensions of 400×450×420 mm (length×width×height). This relatively small size facilitates installation in various applications. One side of the housing 1 is fixedly connected to the outer side of the train mainline power cabinet 6 via a docking mechanism. The front of the housing 1 has a cabinet door. Additionally, the back of the housing 1 also has a cabinet door. An electrical mounting plate is installed inside the housing 1, which is used for the installation of electrical components and wiring, such as the PLC 21 and the human-machine interface 22. Furthermore, the cabinet door on the front of the housing 1 has an observation window 13 made of acrylic. Through the observation window 13, operators can see the content displayed on the human-machine interface 22. A sealing strip is installed between the observation window 13 and the cabinet door to provide waterproofing and dustproofing. In particular, the housing 1 is made of stainless steel and has IP55 dustproof and waterproof rating, supports 15KV ESD electrostatic protection and 4KV lightning protection, and is suitable for various harsh outdoor environments.

[0017] The control unit includes a PLC 21 and a human-machine interface 22. The signal input terminal of the PLC 21 is electrically connected to the data monitoring unit 3, and the signal output terminal of the PLC 21 is electrically connected to the input terminal of the wireless transmission unit 4 through the human-machine interface 22.

[0018] The PLC 21 not only receives the insulation test results output by the insulation monitor 31, but also receives the temperature and humidity data from the ambient temperature and humidity monitor 32. Therefore, the PLC 21 can verify the accuracy of the insulation test results from the insulation monitor 31 in the data monitoring unit 3 based on the train line operation data output by the data monitoring unit 3. It then outputs the relevant data to the central control room 5 for storage and to the human-machine interface 22 for display. The human-machine interface 22 displays information such as the current train line's positive-to-ground insulation value, negative-to-ground insulation value, inter-line insulation value, temperature, and humidity. The central control room 5 allows for long-term, valid data storage and retrieval. The data can meet the requirements for two years of file retention. Once full, the oldest file is overwritten, or the data can be transferred via USB for computer reading, printing, and export.

[0019] Furthermore, the human-machine interface 22 can be a Kunlun Tongtai TPC7032Kt model, equipped with a 7-inch high-resolution TFT LCD screen, which can clearly display various electrical parameters such as voltage, current, ground current, and positive and negative ground voltage, providing operators with an intuitive operating experience. It supports multiple communication interfaces, including serial ports (RS232 / 485) and Ethernet, enabling efficient data interaction with the PLC21 and other sensor devices. This makes it ideal for integration into complex control systems. It is accompanied by MCGS configuration software, providing a rich component library and convenient design tools, simplifying the interface development process, reducing the learning curve, and facilitating subsequent system maintenance and upgrades.

[0020] Specifically, the PLC21 is a Delta DVP14SS211R model. This model is a small PLC with a compact design, suitable for installation in environments with limited space. This is particularly important for insulation detection devices that need to be installed on the side of the train's power cabinet, ensuring that the equipment can be easily integrated into the existing mechanical structure. It also supports multiple communication protocols, including RS-232 / 485 serial communication interfaces, enabling easy connection with the data monitoring unit 3, and supports industry standard protocols such as Modbus RTU, allowing it to effectively perform insulation detection result judgment. Furthermore, Delta PLCs are known for their stability and reliability, capable of operating stably for extended periods in harsh environments, and possess protection ratings (IP55), electrostatic discharge protection (15KV ESD), and lightning protection (4KV), ensuring reliable operation in outdoor or industrial environments.

[0021] The data monitoring unit 3 includes an insulation monitor 31 and an ambient temperature and humidity monitor 32. The insulation monitor 31 is used to perform insulation tests on the train main line, and the ambient temperature and humidity monitor 32 is used to detect the temperature and humidity in the air where the train main line is located. The signal output terminals of the insulation monitor 31 and the ambient temperature and humidity monitor 32 are electrically connected to the signal input terminal of the PLC 21. The test terminal of the insulation monitor 31 is electrically connected to the train main line and is used to sequentially perform positive-to-ground insulation tests, negative-to-ground insulation tests, and line-to-line insulation tests on the train main line. The PLC 21 receives the train insulation value detected by the insulation monitor 31 and the temperature and humidity of the air where the train main line is located detected by the atmospheric humidity monitor 32. It can judge whether the insulation result detected by the insulation monitor 31 is correct according to relevant standards and obtain the final test result. The real-time insulation monitor can be the Tonghui TH2683A model, which can provide high-precision insulation resistance measurement, which is crucial for ensuring the safety of the train power supply system. It can accurately detect the insulation status of positive to ground, negative to ground, and between lines, ensuring that all data meets maintenance requirements. It also supports multiple test voltage options to adapt to different test standards and application needs. When performing different types of insulation tests, the test voltage can be adjusted according to specific requirements to obtain the most accurate test results. Furthermore, it has a fast response capability, able to complete insulation resistance measurement in a short time and quickly provide test results, which greatly improves work efficiency for environments requiring frequent insulation testing. In addition, this model of insulation monitor can automatically determine whether the insulation test results are qualified based on relevant air temperature and humidity standards.

[0022] The output of the wireless transmission unit 4 is connected to the signal of the central control room 5. Through long-distance wireless transmission, the detection data can be transmitted to the remote monitoring center of the central control room 5 in real time, realizing remote monitoring and management, and realizing remote detection of ground data information such as train main line voltage, current, ground current, positive ground voltage, and negative ground voltage.

[0023] In addition, the housing 1 is equipped with an AC220V / 50Hz power supply to power the control unit 2, and the power supply can also be converted into DC24V power supply through a step-down circuit to meet the power supply of the human-machine interface 22 in the control unit 2.

[0024] Example 2 The wireless transmission unit 4 includes a wireless transmitting CPE 41 and a wireless receiving CPE 42, i.e., a signal transmitting antenna and a signal receiving antenna, which realize wireless transmission between signals. The wireless transmitting CPE 41 is installed outside the housing 1 and electrically connected to the human-machine interface 22, and is used to transmit data information output by PLC 21. The wireless receiving CPE 42 is installed on the top of the building where the central control room 5 is located and is electrically connected to the central control room 5, and is used to receive data information transmitted by the wireless transmitting CPE 41.

[0025] In addition, the wireless transmission unit 4 can also use wireless IoT modules such as wireless radio frequency and Wi-Fi.

[0026] Example 3 The docking mechanism includes a mounting plate 11 and a positioning post 12. The mounting plate 11 abuts against the outer side of the train mainline power cabinet 6. The mounting plate 11 has through holes, and bolts are threadedly connected to the outer side of the train mainline power cabinet 6 through the through holes to achieve a fixed connection between the housing 1 and the train mainline power cabinet 6. The outer side of the train mainline power cabinet 6 has grooves that correspond to the positioning post 12. Before fixing with bolts, the cooperation between the positioning post 12 and the grooves can first align the installation position of the housing 1, that is, the through holes on the mounting plate 11 and the grooves on the outer side of the train mainline power cabinet 6, which facilitates the subsequent installation of bolts.

[0027] Specifically, the positioning post 12 is hemispherical or square, which facilitates the fitting of the positioning post 12.

[0028] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An insulation detection device for main lines of passenger trains, characterized in that, It includes a housing (1), a control unit (2), a data monitoring unit (3), and a wireless transmission unit (4). The housing (1) is installed on the outer side of the train mainline power cabinet (6), and the housing (1) contains a control unit (2) and a data monitoring unit (3). The control unit (2) includes a PLC (21) and a human-machine interface (22), wherein the signal input terminal of the PLC (21) is electrically connected to the data monitoring unit (3), and the signal output terminal of the PLC (21) is electrically connected to the input terminal of the wireless transmission unit (4) through the human-machine interface (22); The data monitoring unit (3) includes an insulation monitor (31) and an ambient temperature and humidity monitor (32). The insulation monitor (31) is used to perform insulation tests on the train main line, and the ambient temperature and humidity monitor (32) is used to detect the temperature and humidity in the air where the train main line is located. The signal output terminals of the insulation monitor (31) and the ambient temperature and humidity monitor (32) are electrically connected to the signal input terminal of the PLC (21). The output of the wireless transmission unit (4) is connected to the signal of the central control room (5).

2. The insulation detection device for main lines of passenger trains according to claim 1, characterized in that: The wireless transmission unit (4) includes a wireless transmitting CPE (41) and a wireless receiving CPE (42), wherein the wireless transmitting CPE (41) is installed outside the housing (1) and electrically connected to the human-machine interface (22), and the wireless receiving CPE (42) is installed on the top of the building where the central control room (5) is located and electrically connected to the central control room (5).

3. The insulation detection device for main lines of passenger trains according to claim 1, characterized in that: The PLC (21) is a Delta DVP14SS211R model.

4. The insulation detection device for main lines of passenger trains according to claim 1, characterized in that: The housing (1) is box-shaped. One side of the housing (1) is fixedly connected to the outer side of the train mainline power cabinet (6) through a docking mechanism. The front of the housing (1) is provided with a cabinet door.

5. The insulation detection device for main lines of passenger trains according to claim 4, characterized in that: The docking mechanism includes a mounting plate (11) and a positioning post (12), wherein the mounting plate (11) is in contact with the outer side of the train mainline power cabinet (6), and the outer side of the train mainline power cabinet (6) is provided with a groove that corresponds to and cooperates with the positioning post (12).

6. The insulation detection device for main lines of passenger trains according to claim 5, characterized in that: The positioning post (12) is hemispherical or square.

7. The insulation detection device for main lines of passenger trains according to claim 4, characterized in that: An observation window (13) is provided on the surface of the cabinet door.

8. The insulation detection device for main lines of passenger trains according to claim 1, characterized in that: The human-machine interface (22) is model Kunlun Tongtai TPC7032Kt.

Images