Graduation Thesis of Railway Signal Computer Interlocking (2)

Graduation Thesis of Railway Signal Computer Interlocking (2)

Talking about Railway Signal Computer Interlocking and Dispatching Supervision System

This paper briefly introduces the general situation of China's railway transportation system, computer interlocking system and its application in China's railway signal. Based on the computer network equipment technology, a dispatching supervision system for macro-control and supervision of railway shunting operation is designed by centralizing the information resources of subordinate railway stations and yards.

Computer interlocking; Dispatching supervision system

I. Overview of Railway System Transportation of Tianjin Petrochemical Company

Because our company is a super-large state-owned enterprise integrating collection, transportation, processing, production and sales of petrochemical chemical fiber. The location distribution of secondary units determines the characteristics of our three railway yards: each team is relatively independent, and the lines centered on the dispatching of each team extend to each operation department, with many points and long lines and scattered positions. The area where the equipment is located is seriously affected by wind, sand, salt, humidity, dryness and geology, which leads to high failure rate of indoor and outdoor equipment of computer interlocking system, especially outdoor equipment.

Second, the computer interlocking system

1, interlocking and fault-oriented safety

The so-called interlocking refers to the relationship between turnout, route and signal, and the equipment that realizes interlocking is called interlocking equipment. Computer interlocking system is a new type of station centralized interlocking system based on the successful experience of electrical centralization, which uses industrial control computer equipment to replace relay circuits of electrical centralization selection group and execution group, and uses computer software to realize various technical requirements of electrical centralization. Computer interlocking device is mainly composed of indoor equipment and outdoor equipment. Station attendant handles driving operation and man-machine dialogue through computer interlocking console or operator station. The console includes a button panel or mouse and a color station display, which can display all the operations of the station and the working status of the field equipment in real time.

Generally speaking, fault-oriented safety means that when the equipment that affects the operation of the locomotive fails or exists, the interlocking computer should give an alarm in advance before the operation of the locomotive, and notify the electrical or maintenance personnel to solve it in time to prevent the locomotive or train from accidents in operation. Any computer interlocking system must first ensure fault-oriented safety.

2.VSI 2000A computer interlocking system

Because the interlocking systems of our three yards are similar, the computer interlocking system is briefly analyzed and explained with the second team system as an example. The VSI 2000A computer interlocking system can be divided into three layers. The block diagram is shown in 1:

The upper layer is the operator station (usually also called the upper computer). It is a man-machine dialogue equipment for signal operators to handle routes and control equipment. It is a redundant working mode composed of two highly reliable industrial control computers. Two sets of operator stations are respectively equipped with operation indication devices such as display, mouse and speaker. Provide station map, equipment status display, operation prompt and alarm in the form of color light strip graphics and text voice.

Third, the dispatching supervision system and its design

1, Analysis of Dispatching Supervision System. Dispatching and supervision system is a real-time supervision and management information system based on information processing and network technology. It uses the important information such as track occupation, signal display, route arrangement, train operation and related data of each station in the computer interlocking system of each station, and provides it to dispatching commanders at all levels in time and accurately after processing, so as to realize real-time monitoring and display of train operation and station operation and improve the level of dispatching command and management.

2. Mode selection of dispatching supervision system. There are usually two ways to realize dispatching supervision system. One is to use the remote point-to-point communication function of interlocking system. Each station is connected with a pair of modems by telephone lines and equipped with corresponding communication software to transmit data to the server, which provides data for other * * * enjoyment terminals. The second mode is to use the Ethernet function provided by the interlocking system to communicate with other networks and enjoy relevant data information. For the sake of safety, it is not suitable to operate the interlocking host, but to send the database updated from time to time in the historical station to the server in the dispatching supervision system.

3. Overall design scheme of dispatching supervision system. As shown in Figure 2, the overall structure of the system is divided into three parts. The superior dispatching supervision system and the grass-roots station system are shared by the company office. The upper dispatching monitoring system consists of server, lan switches, dispatching display workstation, dispatcher workstation and UPS power supply. Using the remote communication or Ethernet interconnection function of computer interlocking system, using client/server database, the database of superior dispatching supervision system of grass-roots station and computer interlocking system is connected through optical fiber to form a star-shaped private network connection to complete the data exchange between grass-roots station and superior dispatching system. Taking the database of each station as the remote database of the monitoring system, the remote and local databases are exactly the same for the application programs running on the server, which ensures the consistency of information between the monitoring system and each station.

The operating system of dispatching supervision adopts the common standard network operating system WindowsNT/2000 and the network communication protocol TCP/IP, which provides the software foundation for the expansion of dispatching supervision system and the enjoyment of resources. According to the different situation of each railway system, Dell microcomputer or dual-machine hot standby system with high reliability can be considered as the server to ensure adaptability to harsh environment.

Four, computer interlocking system and dispatching supervision system maintenance and repair

(1) During routine inspection, strengthen the inspection of actuators, module status lights, various power boards and interlocking machines. Only in this way can the problems existing in the equipment be found and dealt with in time through the change of the status light. (2) Strengthen the monitoring of UPS and power supply, test the current and voltage of power supply online every day, and check the capacity, charge and discharge of UPS every quarter. Through the real-time test of power supply, it is found that the two-way power supply is unstable and there are many power outages. Therefore, in order to reduce the security risks brought by the operation of single power supply to the on-site transportation operation, an emergency plan for power failure of signal power supply should be formulated, and the matters needing attention in the on-site transportation operation in case of sudden power failure should be found out. (3) Conduct switching tests on the power supply, upper computer, communication board and UPS regularly to avoid problems such as abnormal communication and crash during long-term operation of the equipment. On the basis of reducing the impact on the field operation, the restart test and switching test are carried out regularly, so that the equipment can run for a long period. (4) Using the data recorded by the monitoring machine and electrical maintenance machine of computer interlocking system and dispatching supervision system, according to the replayed station operation and the retrieval records of voltage and current values, correctly analyze the state of power supply, the state of actuator module, interlocking machine and communication, so as to accurately grasp the running trend of the whole system. Focus on analyzing the progress status of the execution module, record the causes and status of problems in the execution module, and put forward corresponding maintenance suggestions.

Through careful maintenance and overhaul of the key components of computer interlocking system and dispatching supervision system, and making full use of and analyzing the data recorded by the monitoring machine, these two systems will run stably and safely for a long time, thus ensuring the safety of railway transportation.

refer to

Sue Plomley. Collect small and medium-sized network networking. Beijing: Electronic Industry Press

[2] Li editor. Lan classic case course. Beijing: Tsinghua University Publishing House.

[3] Hollis ·VSI, 2000. Computer interlocking system of railway signal with two out of three

[4] Railway communication signal. Institute of Communication and Signal, Railway Science Research Institute

[5] Regulations of People's Republic of China (PRC) on Railway Technology Management. People's Republic of China (PRC) Ministry of Railways

The third part of graduation thesis of railway signal computer interlocking

Discussion on the realization of computer interlocking hot standby system for safe railway signal

Abstract: Railway signal is the key project of railway daily operation management. Computer interlocking system is an important foundation to realize modern railway operation, which can effectively improve the opening capacity of stations. Compared with the traditional electric interlocking system, the computer interlocking system has the advantages of convenient maintenance and simple design, which is convenient for future transformation and management and promotes the intelligence, informationization and networking of railway management.

Keywords: computer interlocking; Railway signal; promote

With the continuous development of information technology, the railway signal interlocking control system has experienced several development periods, from the traditional mechanical and electromechanical systems to modern control systems such as microelectronics and computers in modern society. Computer interlocking can efficiently and safely maintain the operation of the station and improve the overall operation efficiency of the station. Based on the computer interlocking technology, this paper analyzes how to realize the computer interlocking hot standby system for railway signal safety in China.

1. Overall design of computer interlocking hot standby system for safety railway signals.

The computer interlocking hot standby system of railway signal can effectively improve the practicability and reliability of railway signal system. According to the characteristics of traditional railway signal computer interlocking system, a practical dual-machine hot standby system is designed.

1, dual-machine hot standby system

The interlocking system of dual-machine hot standby computer is controlled by two computers at the same time for logical calculation. During the working process, only one computer controls the transmission line, while the other computer remains in standby state. If the main machine fails and the standby machine has no fault during operation, it will automatically switch to the standby machine and switch from the standby machine to the main machine to continue to control the operation of the transmission line.

In the traditional railway signal computer interlocking system, manual cold backup is mostly used to ensure the stability of the interlocking system, but compared with the dual-machine hot standby system, this has obvious shortcomings. First of all, when the host fails, it is necessary to manually switch the standby equipment, which has poor convenience and performance. Secondly, in the process of switching between master and standby, it is easy to lose information. Finally, in terms of safety performance, the dual-machine cold standby system has obvious defects and the single machine efficiency is insufficient. It is precisely because of the obvious shortcomings of the traditional dual-machine hot standby system that the development of dual-machine hot standby system should be accelerated.

2. Design principles of dual-machine hot standby system

In the design process of dual-machine hot standby system, the premise, goal and principle of design work should be made clear to ensure the scientific design process. 、

The premise of designing dual-machine hot standby system is to ensure the safety and efficiency of information transmission and ensure the driving safety to the maximum extent.

In the design process, the following factors should be considered:

(1) Accuracy: The complementary work of the main and standby machines is a major feature of the dual-machine hot standby system. When the main engine fails, it is necessary to ensure that the standby engine can send out signals and start working on time, and at the same time start the information exchange program between the main engine and the standby engine. When the host computer returns to work, the standby computer should transmit the information back to the host computer again.

(2) Convenience: Convenience mainly refers to the smooth completion of information exchange between the host computer and the standby computer.

3. Realization of system functions

The dual-machine hot standby system should be realized in five levels, including: man-machine conversation layer, interlocking operation layer, calibration drive layer, interface layer and monitoring object layer. This paper analyzes the design by dividing it into five levels.

(1) man-machine dialogue layer

Man-machine dialogue layer consists of computer basic equipment such as display screen, stereo and mouse. It relies on mouse and keyboard to access command information and transmits it to two computers through serial port. Usually, a multi-screen technology can be used to display the whole station (the size of the station determines the number of monitors), and the dynamic information of the station platform and the text information in the computer interlocking system should also be displayed on the dynamic display screen or LED display screen, which is convenient for staff to check and manage. When the host fails, it is necessary to give an alarm through audio music. Fault flashing lights should also be set on the display screen to ensure that managers can grasp the fault situation and deal with it in the first time.

In the process of setting the man-machine dialogue layer, it is necessary to ensure that the system can be automatically started and closed. According to the actual situation of the platform, start and stop instructions are issued. Optical alarm can be implemented on time, which is convenient for operators to manage and maintain.

(2) Interlocking operation layer

In the dual-machine hot standby system, the interlocking computer is the core part of the whole system, which consists of two complementary hot standby interlocking computers and related servers. In the process of operation, the interlocking computer judges the command signal through the internal interlocking software, analyzes the interlocking signal, generates the control command, and diagnoses the railway signal fault. In the dual-machine hot standby system, two hot standby interlocking computers should have the same configuration, so as to ensure that when the system and operators detect the failure of the interlocking computer, they can enjoy the automatic switching information or manual switching information of the device through * * *, so that the failed computer can quit the application information management program and give an alarm.

(3) Check the drive layer

The composite driving layer consists of two sets of PLC programmable logic controllers with the same configuration. The inspection driver is mainly responsible for collecting the specific information of the station, analyzing relevant information, checking the commands issued by the interlocking computer, driving the station signals, and assisting the system to complete self-monitoring. PLC programmable logic controller is also a mutual hot standby system, which can find the fault status of functional modules such as CPU and I/O through fault detection, and can also switch between functional modules such as CPU and I/O in PLC programs.

(4) Interface layer

The interface layer is the key to connect the computer interlocking system with the monitored object. The interface layer mainly undertakes the following tasks:

① Monitor the station at all times, and complete the conversion from liquid level information to static/dynamic and pulse drive signal between PLC system signals to liquid level information.

② Monitor the operation of special circuit control equipment and support the system to complete the monitoring.

(5) Monitoring object layer

The monitoring object layer mainly refers to the computer interlocking system used to monitor the station state control and mobilize the locomotive signal control equipment. During the operation of the station, the relevant equipment of the monitoring object layer mainly includes color signal lights for indicating the train operation in the station, switch machines for turning forks, track circuits for detecting the idle sections and occupied states of the tracks in the station, etc.

Second, the system security protection

In the process of improving the safety of computer interlocking system, dual-mode dynamic redundancy scheme or three-mode static redundancy scheme are adopted at home and abroad. The three-mode static redundancy scheme uses hardware redundancy to improve the reliability of the system, and the two-mode dynamic redundancy scheme integrates hardware redundancy resources and combines relevant fault detection technologies for analysis and processing. In the work of protecting the security of dual-machine hot standby system, we can choose the solution according to the specific form.

Conclusion: This paper provides a direction for the future development of railway signal informatization by simply analyzing the design process of dual-machine hot standby system in computer interlocking hot standby system for safe railway signals, hoping to help relevant departments solve practical problems. In the specific implementation process, there will be poor information exchange and unstable data. It is hoped that the staff can overcome practical difficulties, practice boldly, and constantly enrich the dual-machine hot standby system to make the dual-machine hot standby system more concrete and practical.

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