Track traffic direct current traction power supply system test demonstration platform

Abstract

The utility model discloses a rail transit direct-current traction power supply system test demonstration platform, and relates to the technical field of rail transit traction power supply demonstration, a station switching device is arranged in a cabinet, double Goose networking is carried out on a protection unit, an intelligent monitoring display unit and related electrical elements are arranged in a cathode cabinet, and a Web server is arranged in related equipment. The problems that inter-station simulation demonstration is inconvenient and practical demonstration is difficult in the prior art are solved, and the beneficial effect of increasing the economic practicability of the test demonstration platform is achieved.

Description

Technical Field

[0001] This application relates to the field of demonstration technology for traction power supply in rail transit, specifically a test demonstration platform for a DC traction power supply system for rail transit. Background Technology

[0002] With the rapid development of urban rail transit in China, DC traction power supply technology is also constantly being innovated, improved, and applied. New high-tech measurement and control protection devices, intelligent equipment, and highly reliable communication methods provide safe, reliable, and fully functional solutions for urban rail DC traction power supply systems. However, the application of new technologies requires extensive promotion and verification to gain customer acceptance, which takes considerable time and effort. Furthermore, how to quickly master and resolve difficulties encountered by users when using new technologies becomes a primary issue that must be addressed. A common solution is to create a test demonstration platform. For example, patent document CN205983042U discloses an urban rail traction power supply simulation and demonstration device, including a real-time simulator, a host computer, and a display device. The real-time simulator includes a chassis containing a processor board and I / O boards. The processor board has communication interfaces and expansion interfaces. The I / O boards are connected to the processor board through the expansion interfaces. The communication interfaces include a simulation management bus interface and a real-time data bus interface, which are respectively connected to the host computer. The host computer is connected to the display device.

[0003] Because DC traction systems involve operations between stations, such as inter-station jumps, it is obviously too time-consuming and space-consuming to bring together the actual equipment from each station during testing and demonstration. In actual operation, the aforementioned patents and existing technologies only solve the problem of AC / DC integrated simulation, but do not solve the problem of how to conduct inter-station simulation. Moreover, existing simulation systems can only simulate some equipment and do not have simulation capabilities for equipment that requires big data analysis and dynamic changes in operational data. In particular, when demonstrating new technologies and training customers, the lack of physical objects for hands-on practice makes it impossible to achieve satisfactory results. This cannot meet the testing and demonstration requirements of integrated intelligent DC traction power supply systems for urban rail transit, which are increasingly widely used in urban rail transit. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides a test and demonstration platform for a DC traction power supply system for rail transit, which solves the problems of inconvenient inter-station simulation demonstrations and difficulties in practical demonstrations.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A test demonstration platform for a DC traction power supply system for rail transit includes two DC feeder cabinets and a negative terminal cabinet. Each of the two feeder cabinets is equipped with a circuit breaker, a circuit breaker characteristic monitoring device, and a protection unit. The negative terminal cabinet includes a disconnecting switch, a switch, an intelligent monitoring and display unit, a negative terminal cabinet protection unit, and a site switching device. Each of the DC feeder cabinet's protection unit and the negative terminal cabinet's protection unit is equipped with two Goose network interfaces. The first Goose network interface is wiredly connected to each other to form a first Goose network, and the second Goose network interface is wiredly connected to each other to form a second Goose network. Each DC feeder cabinet's protection unit is also equipped with... The interface is wired to the circuit breaker characteristic monitoring device. Each circuit breaker is equipped with a control interface that is wired to the protection unit of its respective DC feeder cabinet. Each circuit breaker is equipped with a characteristic monitoring sensor that can sense the characteristics of the circuit breaker. Each characteristic monitoring sensor is communicatively connected to the circuit breaker characteristic monitoring device of its respective DC feeder cabinet. The disconnecting switch is equipped with a control interface that is connected to the protection unit of the negative pole cabinet. The circuit breaker characteristic monitoring devices in the two DC feeder cabinets are directly wired to the switch of the negative pole cabinet. The site switching device is wired to the switch and is used to switch the site position of the DC feeder cabinet. The intelligent monitoring and display unit is communicatively connected to the switch.

[0007] Preferably, the interface of the protection unit of the DC feeder cabinet and the circuit breaker characteristic monitoring device are connected via Ethernet cable communication.

[0008] Preferably, the site switching device uses an intelligent monitoring and display unit to control the site location of the DC feeder cabinet where the switching is performed.

[0009] Preferably, the negative electrode cabinet is equipped with a moving contact temperature sensor, which is wired to the intelligent monitoring and display unit.

[0010] Preferably, a busbar temperature sensor is installed inside the negative electrode cabinet, and the busbar temperature sensor is wiredly connected to the intelligent monitoring and display unit.

[0011] Preferably, the wired communication connection between the moving contact temperature sensor and the intelligent monitoring and display unit adopts an RS485 serial communication connection with Modbus protocol.

[0012] Preferably, the wired communication connection between the busbar temperature acquisition device and the intelligent monitoring and display unit adopts an RS485 serial communication connection with Modbus protocol.

[0013] Preferably, the moving contacts of the circuit breakers in the two DC feeder cabinets are equipped with moving contact temperature sensors, which are wirelessly connected to the moving contact temperature acquisition unit.

[0014] Preferably, the two DC feeder cabinets are equipped with busbar temperature sensors, which are wirelessly connected to the busbar temperature acquisition unit.

[0015] Preferably, each of the DC feeder cabinets has a protection unit and a negative electrode cabinet has an intelligent monitoring and display unit, and the negative electrode cabinet protection unit is equipped with a Web server.

[0016] This application achieves the goal of simulating local, neighboring, or cross-station equipment by setting up a site switching device in the negative terminal cabinet of the test demonstration platform. Furthermore, by installing an intelligent monitoring and display unit in the negative terminal cabinet to collect data from temperature sensors, circuit breaker characteristic monitoring devices, and other sources, and by incorporating a web server within the protection unit and intelligent monitoring and display unit, a comprehensive platform integrating online monitoring and intelligent operation and maintenance management can be formed. This platform integrates online monitoring, visualization, and GOOSE jump-over, and allows for remote web access and display. It is suitable for factory prototype demonstrations or customer training, forming a fully functional intelligent test demonstration platform for DC traction power supply systems in rail transit, and is economical and practical. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the composition of an embodiment of this application;

[0018] Among them, 1-first feeder cabinet, 11-first circuit breaker, 111-first moving contact temperature sensor, 12-first circuit breaker characteristic monitoring unit, 121-first characteristic monitoring sensor, 13-first feeder cabinet protection unit, 14-first busbar temperature sensor, 2-second feeder cabinet, 21-second circuit breaker, 211-second moving contact temperature sensor, 22-second circuit breaker characteristic monitoring unit, 221-second characteristic monitoring sensor, 23-second feeder cabinet protection unit, 24-second busbar temperature sensor, 3-negative pole cabinet, 31-switch, 32-intelligent monitoring and display unit, 33-negative pole cabinet protection unit, 34-disconnecting switch, 35-site switching device, 36-busbar temperature acquisition device, 37-moving contact temperature acquisition device, 41-first Goose network, 42-second Goose network. Detailed Implementation

[0019] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0020] This embodiment provides a technical solution: an embodiment of a test demonstration platform for a DC traction power supply system for rail transit, comprising a negative terminal cabinet 3 and two DC feeder cabinets, namely a first feeder cabinet 1 and a second feeder cabinet 2. Each of the two feeder cabinets is equipped with a circuit breaker, a circuit breaker characteristic monitoring device, and a protection unit. Specifically, the first feeder cabinet 1 is equipped with a first circuit breaker 11, a first circuit breaker characteristic monitoring unit 12, and a first feeder cabinet protection unit 13; the second feeder cabinet 2 is equipped with a second circuit breaker 21, a second circuit breaker characteristic monitoring unit 22, and a second feeder cabinet protection unit 23. The protection unit is used to detect the operating status of the circuit breaker and control its opening and closing, and to monitor the voltage and current of the cabinet in real time, protecting the feeder circuit, while simultaneously uploading signals to the backend and the circuit breaker characteristic monitoring device. The circuit breaker characteristic monitoring device is used to monitor the operating characteristic parameters of the circuit breaker, assess its health status, and identify potential defects. It detects the current of the opening and closing coils by connecting sensors and connects to the status of the auxiliary contacts of the circuit breaker switch. By monitoring the above parameters during each opening and closing operation of the circuit breaker, the recorded waveform curves are analyzed and compared with a standard curve library to assess the health status of the circuit breaker.

[0021] The negative electrode cabinet 3 includes an isolating switch 34, a switch 31, an intelligent monitoring and display unit 32, a negative electrode cabinet protection unit 33, and a site switching device 35. Each of the DC feeder cabinet protection units and the negative electrode cabinet protection unit 33 is equipped with two Goose network interfaces. The first Goose network interface is connected to each other via wired communication to form a first Goose network 41, and the other Goose network interface is connected to each other via wired communication to form a second Goose network 42. The communication network structure between cabinets can be connected by Ethernet cable or fiber optic cable, and the protocol adopts the Goose communication protocol. With the site switching device 35, it can be used to demonstrate and test the inter-trip function. That is, when one of the feeder cabinets is set as the local station using the site switching device 35, the inter-trip of the first feeder cabinet 1 and the second feeder cabinet 2 of the negative electrode cabinet 3 in the station can be tested and demonstrated. When the feeder cabinet is set as the neighboring station using the site switching device 35, the inter-trip of the neighboring feeder cabinet 2 of the first feeder cabinet 1 can be tested and demonstrated. In addition, the protection units of the feeder cabinets are all reserved with communication interfaces, and can also be connected to other systems such as 35KV protection for inter-trip testing. In this embodiment, the control and interaction method for the site switching device 35 is to use the intelligent monitoring display unit 32 for direct touch control. Alternatively, it can be remotely controlled via a web page provided by a web server using a portable computer such as a mobile phone, tablet computer, or laptop computer, or even by connecting an external physical switch for switching control.

[0022] Each of the DC feeder cabinets is also provided with an interface for wired communication with the circuit breaker characteristic monitoring device. In this embodiment, the wired communication connection between the interface of the DC feeder cabinet's protection unit and the circuit breaker characteristic monitoring device is an Ethernet cable communication connection, i.e., a polyolefin insulated horizontal twisted pair cable for digital communication.

[0023] Each circuit breaker is equipped with a control interface that is wired to the protection unit of its respective DC feeder cabinet. Each circuit breaker is also equipped with a characteristic monitoring sensor that can sense the characteristics of the circuit breaker. Specifically, the first circuit breaker 11 is equipped with a first characteristic monitoring sensor 121, and the second circuit breaker 21 is equipped with a second characteristic monitoring sensor 221. Each characteristic monitoring sensor is communicatively connected to the circuit breaker characteristic monitoring device of its respective DC feeder cabinet. The disconnecting switch 34 is equipped with a control interface that is connected to the negative pole cabinet protection unit 33. The circuit breaker characteristic monitoring devices in the two DC feeder cabinets are directly wired to the switch 31 of the negative pole cabinet 3. The intelligent monitoring and display unit 32 is communicatively connected to the switch 31. In this embodiment, the site switching device 35 is located inside the negative pole cabinet 3 and is used to switch the site position of the DC feeder cabinet. The site switching device 35 can be used on this platform to simulate one of the feeder cabinets as the feeder cabinet of this station, or it can be simulated as the feeder cabinet of the adjacent station or even the feeder cabinet of the cross-station during Goose jump test, so as to meet the test requirements for realizing the Goose bilateral jump function.

[0024] This embodiment also includes a busbar temperature sensor 36 and a moving contact temperature sensor 37, which are wiredly connected to the intelligent monitoring and display unit 32 and installed in the negative electrode cabinet 3. Busbar temperature sensors are installed in the two DC feeder cabinets, and these sensors are wirelessly connected to the busbar temperature sensor 36. Specifically, a first busbar temperature sensor 14 is installed in the first feeder cabinet 1, and a second busbar temperature sensor 24 is installed in the second feeder cabinet 2. Moving contact temperature sensors are installed on the moving contacts of the circuit breakers in the two DC feeder cabinets, and these sensors are wirelessly connected to the moving contact temperature sensor 37. Specifically, a first moving contact temperature sensor 111 is installed on the moving contact of the first circuit breaker 11, and a first moving contact temperature sensor 211 is installed on the moving contact of the second circuit breaker 21. In this embodiment, the wireless temperature sensor communicates wirelessly with both the busbar temperature sensor and the moving contact temperature sensor.

[0025] In this embodiment, a moving contact temperature sensor 37 is installed inside the negative electrode cabinet 3. The moving contact temperature sensor 37 is wiredly connected to the intelligent monitoring and display unit 32. A busbar temperature sensor 36 is also installed inside the negative electrode cabinet 3. The busbar temperature sensor 36 is also wiredly connected to the intelligent monitoring and display unit 32. The wired communication connections between the moving contact temperature sensor 37, the busbar temperature sensor 36, and the intelligent monitoring and display unit 32 are all made using RS485 serial communication with the Modbus protocol. The difference between the sensor and the data acquisition device in this embodiment lies in whether it can be directly connected to a switch or be acquired by the intelligent monitoring and display unit 32.

[0026] In this embodiment, the communication connection can also be established using other suitable communication methods, such as FTP protocol communication, IEC61850 MMS, Modbus communication, etc.

[0027] In this embodiment, each of the DC feeder cabinet protection units and the intelligent monitoring and display unit 32 and negative electrode cabinet protection unit 33 is equipped with a Web server. By using WEB technology, it can be accessed through a browser to monitor status information in real time, download programs, and save event records, fault waveforms, etc.

[0028] In the description of this application, it should be noted that the switch 31, intelligent monitoring and display unit 32, protection unit, circuit breaker characteristic monitoring unit, and site switching device 35 all adopt existing technologies and do not involve improvements to computer programs or algorithms. For example, the intelligent monitoring and display unit 32 is equipped with a large-size color touch screen, adopts an iPad-like swipe operation mode, and has functions such as real-time display of device status, saving historical data, and changing device parameters. It is a comprehensive platform integrating online monitoring and intelligent operation and maintenance management, including real-time monitoring, alarm analysis, and data analysis functions. The real-time monitoring function can collect data from the circuit breaker characteristic monitoring device, protection device, and temperature acquisition device in real time through the network composed of switches, and display it in a visual interface in the form of charts, dashboards, etc., so that users can understand the operating status of equipment and systems in real time. Alarm analysis function: When the monitored data exceeds the preset threshold, the alarm mechanism will be triggered immediately. The alarm information will be displayed on the page. The data analysis function provides powerful data processing and analysis tools. Users can perform in-depth analysis of real-time and historical data and generate various analysis charts. The data analysis function supports cross-analysis of multi-dimensional data, helping users extract valuable information from large amounts of data and assisting in decision-making. All devices and apparatuses in this embodiment have reserved interfaces, allowing for individual connection testing using a laptop computer. The terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this application to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and inventive concept of this application, should be included within the scope of protection of this application.

Claims

1. A test demonstration platform for a DC traction power supply system for rail transit, comprising two DC feeder cabinets and a negative terminal cabinet (3), characterized in that: Each of the two feeder cabinets is equipped with a circuit breaker, a circuit breaker characteristic monitoring device, and a protection unit. The negative terminal cabinet (3) includes a disconnecting switch (34), a switch (31), an intelligent monitoring and display unit (32), a negative terminal cabinet protection unit (33), and a site switching device (35). Each of the DC feeder cabinet protection units and the negative terminal cabinet protection unit (33) is equipped with two Goose networking interfaces. The first Goose networking interface is wired to form a first Goose network (41), and the other Goose networking interface is wired to form a second Goose network (42). Each DC feeder cabinet protection unit is also equipped with an interface for wired communication with the circuit breaker characteristic monitoring device. The circuit breaker is equipped with a control interface that is wired to the protection unit of its respective DC feeder cabinet. Each circuit breaker is equipped with a characteristic monitoring sensor that can sense the characteristics of the circuit breaker. Each characteristic monitoring sensor is connected to the circuit breaker characteristic monitoring device of its respective DC feeder cabinet. The isolating switch (34) is equipped with a control interface that is connected to the protection unit (33) of the negative pole cabinet. The circuit breaker characteristic monitoring devices in the two DC feeder cabinets are directly wired to the switch (31) of the negative pole cabinet (3). The site switching device (35) is wired to the switch (31) and is used to switch the site position of the DC feeder cabinet. The intelligent monitoring display unit (32) is connected to the switch (31).

2. The test and demonstration platform for the DC traction power supply system of rail transit according to claim 1, characterized in that: The interface of the protection unit of the DC feeder cabinet and the circuit breaker characteristic monitoring device are connected via Ethernet cable communication.

3. The test and demonstration platform for the DC traction power supply system of rail transit according to claim 1, characterized in that: The site switching device (35) uses an intelligent monitoring and display unit (32) to control the site location of the DC feeder cabinet where the switching is located.

4. The test and demonstration platform for the DC traction power supply system of rail transit according to claim 1, characterized in that: The negative electrode cabinet (3) is equipped with a moving contact temperature acquisition device (37), which is wired to the intelligent monitoring and display unit (32).

5. The test and demonstration platform for the DC traction power supply system of rail transit according to claim 1, characterized in that: The negative electrode cabinet (3) is equipped with a busbar temperature acquisition device (36), which is wired to the intelligent monitoring and display unit (32).

6. The test and demonstration platform for the DC traction power supply system of rail transit according to claim 4, characterized in that: The wired communication connection between the moving contact temperature acquisition device (37) and the intelligent monitoring and display unit (32) adopts RS485 serial communication connection with Modbus protocol.

7. The test and demonstration platform for the DC traction power supply system of rail transit according to claim 5, characterized in that: The wired communication connection between the busbar temperature acquisition unit (36) and the intelligent monitoring and display unit (32) adopts RS485 serial communication connection with Modbus protocol.

8. The test and demonstration platform for the DC traction power supply system of rail transit according to claim 4, characterized in that: The moving contacts of the circuit breakers in the two DC feeder cabinets are equipped with moving contact temperature sensors, which are wirelessly connected to the moving contact temperature acquisition unit (37).

9. The test and demonstration platform for the DC traction power supply system of rail transit according to claim 5, characterized in that: The two DC feeder cabinets are equipped with busbar temperature sensors, which are wirelessly connected to the busbar temperature acquisition unit (36).

10. The test and demonstration platform for the DC traction power supply system of rail transit according to claim 1, characterized in that: Each of the DC feeder cabinets has a protection unit and a negative electrode cabinet (3) with an intelligent monitoring and display unit (32) and a negative electrode cabinet protection unit (33) equipped with a Web server.

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