Luo Xuanzhi.
Ankerui Electric Co., Ltd. *** Shanghai Jiading 201801
【Summary】:At present, the unattended substation of the highway tunnel has been set up with the best monitoring facilities, in the daily operation due to the lack of light, the tunnel monitoring room personnel can not patrol remotely, there is a blind inspection of monitoring, missing detection problems. In view of this problem, this paper proposes an intelligent lighting scheme for unattended substations in highway tunnels, which provides a reference for the lighting engineering design of tunnel substations.
[Keyword]:Freeway; tunnel substation; Smart lighting.
0 Introduction. The tunnel substation along the highway undertakes the power supply of tunnel lighting, ventilation, monitoring and fire protection facilities, and its safe operation plays a vital role in the safe operation of the tunnel. Tunnel substation has the characteristics of many points and dispersion, and most of them belong to unattended substations, the tunnel monitoring room has carried out intelligent monitoring and management, but due to insufficient light, the tunnel monitoring room personnel can not patrol remotely, there is a blind inspection of monitoring, missing detection problems, in order to cooperate with the best monitoring facilities, to achieve remote opening of lighting facilities, intelligent lighting design of tunnel substation has become very necessary. In addition, due to the fact that there are dozens of unattended tunnel substations along some highways, when there is an alarm or fault situation, the on-site situation of the substation can be checked in time, reducing the number of personnel rushing to the scene to check and dispose of, and greatly reducing operating costs. At present, due to the requirements of the construction of intelligent substations, the substation has been designed or transformed according to the traditional lighting mode according to the intelligent lighting mode, and the traditional lighting mode is still used in the lighting of the highway tunnel substation, so it is also very meaningful to carry out the intelligent lighting design of the highway tunnel substation from the perspective of realizing highway informatization and intelligence.
1. Network structure of intelligent lighting technology in substation.
The intelligent lighting system of the substation adopts the intelligent lighting system in the form of CAN bus, which mainly controls the lighting of various functional rooms and outdoor lighting of the substation building, and can also complete the drive of switching equipment or the linkage with third-party intelligent equipment. All unit devices in the system (except the power supply) have a physical address, and all modules are formed into a network through the CAN bus, and the equipment is set and defined by the configuration software.
The network structure of the system is composed of a regional layer, a line layer, and a device layer, and each region supports multiple lines, and each line can support different types of modules or control panels.
Device layer: The device layer is also known as the CAN bus layer, all modules (except power supply) in the device layer have physical addresses, and the modules can be set and defined through the background software, and the device layer modules can be connected to the network switch through the communication conversion module.
Line layer: Each line* can support up to 62 device layer modules. Lines communicate with each other through network switches.
Zone Layer: The zone layer* can support up to 62 independent lines.
Figure 1 shows the network structure of the smart lighting system. 
Figure 1: Schematic diagram of the network structure of the intelligent lighting system.
2. System composition and power distribution system design.
The equipment composition of the system mainly includes the intelligent lighting system, which is composed of three parts: system unit, input unit and output unit. System unit: host, PC interface, etc.; Input unit: touch screen, smart switch, etc.; Output unit: intelligent relay, etc. The system structure diagram and distribution box system diagram are shown in the figure
Figure 2 System structure diagram
Fig.3 Distribution box system diagram.
The intelligent lighting control system adopts an intelligent control panel, which has the on-site control of the switch with lighting and sensing functions, and can also set different lighting periods through software programming according to different times and the external environment, and can also be controlled by the background software, and all lighting circuits are monitored in the main control center, and the switch of the lamp is controlled through the computer operation interface.
3 Main equipment selection.
1) Output unit selection: The output unit is the driver that accepts the bus signal and controls the terminal equipment in the intelligent lighting system. The main output unit of the intelligent lighting of the substation is the relay output module, which controls the switching amount of each light circuit, socket or other equipment. In the design, a four-way relay output module and an eight-way relay output module are selected.
2) Input unit selection: The input unit is a bus device that transmits bus signals and commands and controls the output unit in the intelligent lighting control system. The main input unit of intelligent lighting in the substation is an intelligent panel, which is installed on site and used for the control of lamps and lanterns. In the design, a 6-key LCD intelligent control panel and an 8-channel AC switch status acquisition module are adopted.
3) System unit selection: The system unit is mainly used for bus networking, communication, logical storage, third-party interface communication and other functions.
Power module: It is a system device that mainly provides DC24V bus power supply for intelligent lighting system, and has a built-in current limiter to ensure the stability and reliability of bus power supply.
Intelligent gateway: The intelligent gateway is used to realize the communication and network management functions of the intelligent lighting control system, with the functions of IP network, timing, processing RS232 485 data, and communicating with the management platform through the TCP UDP protocol.
4 Accuray intelligent lighting control system.
4.1 Overview.
Alibus smart lighting products use RS485 bus technology, which is mature, reliable, safe and stable. The switching driver has the ability to work independently, which is suitable for some small and medium-sized projects; Modular design, can be arbitrarily spliced and expanded, while reserving the Io port and Modbus interface, it can also meet the data exchange with the Acrelems enterprise microgrid management cloud platform.
4.2. Application place.
It is suitable for the lighting control needs of various intelligent communities, hospitals, schools, hotels, as well as large-scale public projects such as sports venues, airports, tunnels, and stations.
4.3. System structure.
4.4. System functions.
1) Real-time detection and display of the first status of each module, feedback the on-site control loop switch status, monitoring interface according to the layout of each partition of the floor and circuit list to browse.
2) When the module is offline, the gateway device is disconnected, or the status feedback is inconsistent with the control command issued, a fault alarm will occur, and the fault alarm information will be recorded and displayed in the interface.
3) It can realize on-off control of a single lighting circuit; Each module and floor has a corresponding module control switch and floor control switch, and it can also be controlled by a module or the entire floor.
4) The switching driver supports the zero-crossing trigger function, and the opening and closing operation of the load (lamp) is only carried out when the AC crosses zero; It can effectively reduce electromagnetic interference and impact on the power grid, and extend the life of lamps and controls.
5) The power-down state can be preset for each lighting circuit, and when the lighting power supply is power-off, the switching driver will automatically switch to the preset power-down state; Make sure that the switching state of the luminaire is certain and controllable when the power is back on.
6) Drag the dimming control, the lighting equipment is dimmed from 0% to 100%, the dimming control can be realized for a single lighting circuit, the dimming master control can realize the dimming control for the lighting circuit of a module, and the dimming control can also be realized for multiple lighting circuits, and the state of the on-site switch is fed back through the on-off state of the icon.
7) Click the scene control to turn on or off the corresponding scene settings, the software interface displays different scene modes and scene functions, and shows whether the corresponding scene state is on or off through the on/off icon.
8) Set the timer time, after confirming the time point, set the action to be performed at the event point, and set the light to turn on or off at the set time.
9) The system can automatically calculate the sunrise and sunset time of each day through the preset local longitude and latitude information; Control the lighting switch according to the astronomical clock to realize the function of turning on the lights at sunset and turning off the lights at sunrise.
10) All timing control plans can be sent and saved to the drive module; When the host computer system fails or the module is offline, the driver module can use the built-in RTC clock to maintain the normal execution of the timing control plan, without affecting the daily lighting control effect.
11) The system structure is a distributed bus structure; Each component in the system is independent of other components and can work independently; Each component in the system can be programmed to achieve a variety of functions.
12) Reserve BA or third-party integration platform interface, using modbus, opc, etc.
4.5. Equipment selection.
5 Concluding remarks.
In order to practice digital transportation and intelligent transportation, it is the general trend to use information technology to coordinate the management of a large number of facilities along the highway, and the tunnel substation has a special position to ensure driving safety, and the intelligent lighting of the unattended tunnel substation can help better complete the monitoring task and solve the problem of blind inspection and missed detection.