Metro LED lighting design

In view of the existing problems in the lighting design of subway underground stations, the optimization design suggestions are put forward from the aspects of lighting distribution, parameter calculation, system optimization, and more energy-saving LED lamp selection, and applied in the actual design, and achieved good design results. .

1 Introduction

In recent years. With the rapid development of the national economy, the number of cars in China has increased sharply, road congestion has become increasingly serious, and underground cities (metro stations) have been built in major cities. To alleviate traffic congestion. The subway runs underground all year round and has high requirements for lighting. Not only requires power saving, high brightness, and long life. Uninterrupted lighting must also be guaranteed.

At present, commonly used incandescent lamps, fluorescent lamps, high-pressure sodium lamps, etc. are all powered by the AC grid. The best-designed AC grid is also inevitably subject to power outages. To ensure uninterrupted lighting in the ground. An emergency lighting power source consisting of a rectifier, a battery, and an inverter must usually be installed. When the grid is normally powered, the AC power is converted to DC by the rectifier and charged to the battery; when the grid is interrupted. The battery turns the direct current into alternating current through the inverter to supply power to the lighting fixture. The cost of such an uninterrupted lighting system is high, and at the same time, it has undergone many changes. Power consumption is also large.

In recent years, semiconductor lighting lamps (LEDs) powered by DC power supplies have been rapidly developed. These lamps consume 90% less energy than incandescent lamps. At the same power, LEDs have a luminous intensity higher than that of ordinary fluorescent lamps and high-pressure sodium lamps by more than 40%. And the life of LED lights can reach 10 million hours. The color rendering index can reach more than 80, far higher than the high pressure sodium lamp. Due to the constant current supply of DC, it is impossible for the LED lamp to strobe.

therefore. It has become the best green lighting fixture. The use of LED lights in subway stations not only saves a lot of electricity and a lot of copper cables. It also saves a lot of maintenance costs. It also ensures the quality of the lighting. Aiming at the problems existing in the current subway lighting system. It provides a novel structure and low cost. Long service life and good power saving effect. Highly reliable metro lighting solutions.

2 lighting classification and distribution

Metro stations (underground rail transit) are usually divided into two floors: the station floor and the platform floor, and their corresponding electromechanical equipment is usually arranged at both ends of the station (A and B). Station lighting points: equipment area lighting, public area work lighting, public area power saving lighting, cable interlayer lighting, guiding sign lighting, according to the load level: primary load, secondary load, tertiary load. The primary load mainly includes: accident lighting, class II guiding sign lighting, three types of guiding sign lighting, four types of guiding sign lighting, public area working lighting, power saving lighting; secondary load is mainly equipment area working lighting and a kind of guiding sign Lighting; three-stage load mainly has advertising lighting. The incoming power of the accident lighting power supply room is taken from the two low-voltage busbars of the substation, and the battery is used as the backup power source.

3 lighting power distribution design

3.1 In order to facilitate operation and management, a lighting distribution room is set up at the station platform and the station floor at both ends of the station. The upper and lower two distribution rooms are generally aligned, which facilitates the management of the electrical equipment of the floor and the upper and lower cables. Laying. The public lighting distribution box is centrally located in the lighting distribution room for easy control.

3.2 Types of lighting and control methods: Lighting is divided into general lighting, emergency lighting, induced lighting, advertising lighting and security lighting. Centralized management of public lighting, unified control. The computer room and office lighting are controlled locally. In the early design of the Beijing subway, part of the lighting was a constant light that continued to work after the train was stopped, called power-saving lighting. Because the meaning of power-saving lighting can not correctly express its lighting properties, some cities do not use the word subway, but collectively referred to as general lighting.

3.3 The lighting of the platform and the hall floor is mainly composed of general lighting and I emergency lighting. Each section of the platform and station lighting is a two-way lighting power supply, divided into 6~8 branches, cross-distribution. After the peak of the operation, some of the branches can be stopped to save lighting power. The attached room can be powered by a separate loop. After the night train is out of service, the general lighting is turned off, and the station lighting is illuminated by emergency lighting.

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