1 Tunnel lighting design essentials During the day when the driver drives the vehicle from the outside of the tunnel to enter, enter and pass through the tunnel, if there is no lighting device in the tunnel, due to the great difference in brightness between the inside and outside of the tunnel, there will be a “black hole†at the entrance and a “light hole†at the exit. "At night, the driver enters and passes through the tunnel with the lighting system, and the situation is just the opposite. These phenomena will cause a safety accident. To this end, the "Code for Design of Ventilation and Lighting for Road Tunnels" has formulated relevant specifications, and detailed regulations on the brightness of the inlet section, transition section, intermediate section and exit section are as follows: 1) Inlet section brightness requirement Lth (cd/m2) Where k is the reduction factor and L20(S) is the outside brightness (cd/m2) 2) Transition section brightness requirements The brightness Ltr1 of the illumination segment TR1 is as follows: The brightness Ltr2 of the illumination segment TR2 is as follows: The brightness Ltr3 of the illumination segment TR3 is as follows: 3) The brightness of the middle section is Lin, as shown in Table 1. Table 1 Middle section brightness specification 4) The brightness of the exit section. The brightness is 5 times the brightness of the middle section. The night illumination is divided into two levels: when the traffic volume is large, the brightness is equal to the brightness of the middle section; when the traffic volume is small, the brightness is 0.5Lin but not less than 1 cd/m2. Blade Fuse is a kind of current fuse, when the circuit current exceeds the fuse rated current of 2 times in a few seconds when the fuse will play the role of circuit protection. Widely used in equipment circuit protection standard for foreign and domestic automobiles and trucks. Readily identifiable and easily replaced, this fuse can be specified for a variety of low voltage electronic Applications. blade auto fuse, car fuse Dongguan YAC Electric Co,. LTD. , https://www.yacenter-cn.com
Research on LED-based tunnel intelligent lighting technology
At the World Climate Conference in Copenhagen, Premier Wen Jiabao on behalf of China promised that by 2020, the total CO2/GDP ratio will be reduced by 40% to 45% on the basis of 2005. China is mountainous and the mountainous area accounts for 2/3 of the country's total area. It has brought great inconvenience to traffic construction. By the end of 2009, there were as many as 6,139 national highway tunnels, including 190 special long tunnels and 905 long tunnels. The power consumed by tunnel lighting is quite huge. To this end, we have conducted research on the lighting method of highway tunnels.