Design of Tunnel LED Stepless Dimming System

In view of the fragile environment, small traffic volume and backward economy along the secondary highway, at the design review meeting of the engineering construction circle, participating experts proposed that all tunnels of the Ruodie project should use energy-saving LED lights with low power consumption. Jiulongxia No. 1, Maru 1, Exia No. 2, Cobb and Juao Tunnels adopt LED stepless dimming control systems, which will be used for the popularization and application of LED rootless dimming control systems for newly built and rebuilt highway tunnels in the province and accumulated experience .

1. Scheme design

The LED light stepless dimming control system of this project puts forward the LEDX stepless dimming control application plan from three aspects: basic lighting, enhanced lighting and emergency lighting. The total length of this section is 144 kilometers, with a total of 6 tunnels, all of which are single-hole Y; tunnels traveling in the J direction, relatively scattered. Therefore, the lighting plan adopts a decentralized control method in design. According to the traffic flow and the brightness inside and outside the tunnel, the illuminance of the LED fixtures in the tunnel is adjusted to ensure the uniformity of the brightness in the tunnel and the smooth transition of the brightness between each section, which meets the actual lighting control needs of the road tunnel site, which leads to better energy saving The effect is as shown in the figure.

To ensure the high reliability and stability of the 1J project, the project uniformly adopts the LID of a high-intelligence electric box from a certain manufacturer. Each lamp is equipped with a single-lamp controller, and the communication between the single-lamp controller and the centralized controller adopts The RS 485 president transmits the signal, and the communication between the centralized controller and the host computer adopts the optical fiber to transmit the signal.

2. Dimming control

1. Basic lighting control

The basic lighting lamps in the tunnel need to work continuously throughout the day, so sufficient redundancy should be considered when designing the basic lighting brightness. , to avoid excessive lighting caused by electricity costs. At the same time reduce the LIDH light center, prolong the life of LED lights and drive power, in the actual operation elbow, the power of the basic lighting can be set.

2. Gaming lighting control

The time of turning on and turning off the tunnel enhanced lighting in the morning and at night, as well as the brightness adjustment after the lighting is turned on, are all completed by the stepless dimming controller. The control system controls the output power of LEDs after calculation and analysis according to the brightness detection data. This lighting method that automatically tracks the brightness outside the cave and adjusts the brightness inside the cave effectively avoids excessive lighting, achieves the goal of lighting on demand, and saves energy to the greatest extent.

3. Application analysis

1. Lighting effect

The tunnel of this project is single-hole 1J-direction traffic, and the lighting arrangement adopts the arrangement of the middle row. The brightness of the entrance is designed at 3500cd/hour, and the brightness reduction value of the entrance section is 0.015, and the brightness of the entrance section is 52.5cd/m2. In order to test the lighting effect, according to the principle of dimming in the design, the entrance section of the Wanlongshanjia tunnel is specially selected as the observation point, and the brightness values of 10%, .50%, and 100% are respectively selected on sunny days. 117Lux, 366Lux, 700Lux, and the luminance values measured by the luminance meter outside the cave are 358Lux, 364Lux, 378Lux. From the actual measurement data, it can be seen that the lighting effect of the tunnel can be satisfied by strengthening the lighting at the entrance and dimming it to 50% on sunny days. Of course, in different seasons and different time periods, long-term observation is required, and the regular values of the brightness values outside the cave are input into the lighting monitoring computer according to the daily, weekly, monthly, and yearly measured values to control the lighting brightness inside the cave. This lighting method, which automatically tracks the brightness outside the cave and adjusts the brightness inside the cave, effectively avoids excessive lighting and achieves the goal of on-demand lighting.

2. Energy-saving effect

The energy-saving effect can be seen from two aspects: on-demand illumination adjustment and intelligent comprehensive management. Taking the Jiulongshan tunnel group as an example, there are 176 120W lamps for enhanced lighting at the entrance and exit of the tunnel, 156 104W lamps for basic lighting at the entrance and exit of the tunnel, 80 45W lamps for basic lighting in the middle section, and 307 8W lamps. The practical application of tunnel lighting, turn on basic lighting + enhanced lighting during the day, the basic lighting operates at 80% brightness, and the enhanced lighting is adjusted according to the external light intensity with 30%-80% illuminance, and the lighting time is 6:00--17:00 ; Turn on the basic lighting at night, the basic lighting operates at a brightness of 80', and the lighting time is 17:00--22: 00; turn on the basic lighting at night, the basic lighting operates at 50% brightness, and the lighting time is 22:DD-6 : 00, without using the intelligent dimming control system, the daily electricity consumption is 914.4KWh, and the annual electricity consumption is 365·914.4·333756KWh; after using the intelligent dimming control system, the daily electricity consumption is 709.8KWh, and the annual electricity consumption is 365·709.8=259077KWh; Calculated according to the local electricity charge of 0.85 yuan/KWh, saving electricity charges (333756-25CXJ77)·0.85=63477.15 yuan. The data shows that the use of LED stepless dimming system has obvious energy-saving effect. If calculated from the whole road section, the electricity bill saved every year is not counted as a fractional day.

3. Power efficiency

In order to verify the power efficiency of the test dimming system, a group of 120W LEDXTs are randomly selected in the enhanced section for testing, and the experimental data are shown in the table below.

From the above data, it can be seen that the tunnel lamp can be continuously opened in the power range of 0%-100% when dimming, which not only reduces the power consumption of the lamp, saves electricity bills, but also reduces the heat of the lamp and the reflection of the light source. Work degree. Working at a lower working temperature can effectively prolong the life of the light sprinkler. The tunnel LED stepless dimming system can regularly check the current, voltage and other data of the lamps, and clearly express it on the software interface, clearly showing which lamp has a problem, without a lot of investigation, to achieve accurate maintenance and save Save time and effort.

4. Conclusion of the program

The LED light stepless dimming control system of the second-level highway tunnel in the county has been in stable operation since it was put into operation. Through application analysis, the lighting effect, energy saving effect and power efficiency are obvious, providing a kind of lighting for highway tunnels that can be used for reference. The control engineering case has positive significance for promoting energy saving of road tunnel lighting and reducing road operation costs.