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Determination of Emergency Lighting Power Supply Mode

Update:04-12-2018
Summary:

 The choice of emergency lighting power supply mode sho […]

 The choice of emergency lighting power supply mode should consider various types of emergency lighting types, conversion time, continuous working time, various power supply characteristics and actual engineering requirements, so as to be safe, reliable and technologically advanced. Economically reasonable.

  

(1) Powered by an independent power source of the grid. It is required to supply two independent power supplies from the outside to ensure that the other way can continue to work when one fault occurs. This kind of power supply has the characteristics that the conversion time is easy to meet the requirements, the continuous working time is long, and the power supply capacity is not limited. However, under the current urban power supply conditions, it is less likely to get two completely independent high-voltage power supplies. In most cases, the power supply department cannot provide a completely independent two-way high-voltage power supply, or it can be provided, but it is rejected by the builder because of excessive investment;

  

(2) Power supply from diesel generator sets. The characteristic is that the power supply capacity and the power supply time are basically not limited, but since the unit is put into operation and takes a long time, the unit that is often in the backup state has a self-starting time specification requirement of less than 30s during the power failure, and therefore can only be used as evacuation lighting and standby lighting. It cannot be used for safety lighting and some alternative lighting for places with high conversion time requirements. Such power supplies are often set up in high-rise buildings to meet fire-fighting requirements, and it is uneconomical to set up emergency lighting.

  

(3) Use battery power. When the self-contained battery in the lamp is used, the self-contained emergency lamp has the advantages of high power supply reliability, rapid conversion, convenient increase and decrease, no impact on line faults, and small impact on battery damage. The disadvantage is large investment and continuous illumination time. Limited by capacity, high operational management and maintenance requirements. This method is suitable for buildings with a small number of emergency lighting, and a relatively scattered and small scale. When adopting the battery pack power supply mode set centrally or in a centralized manner, the advantage is that the power supply reliability is high and the conversion is rapid. Compared with the self-contained battery mode in the lamp, the investment is less, the management and maintenance are more convenient, and the disadvantage is that specialization is required. The impact of the room and battery failure is large, and the line should consider the fire prevention problem. This method is suitable for buildings with more types of emergency lighting, more concentrated lamps, and larger scales.

  

in the actual engineering design process, because the requirements and application scope of the system are not the same, it is sometimes difficult to meet the requirements only by selecting one of the above-mentioned power supply forms, and it is difficult to be safe and reliable. Economically reasonable. Therefore, the determination of the power supply mode should be combined with the fire power load comprehensive consideration, and two or more types of emergency lighting power sources should be selected at the same time. There are not many emergency lighting lamps. Small-scale buildings use self-contained battery power supply. Large-scale high-rise buildings and some special important buildings are powered by independent power supply of the grid, with generator sets or battery packs, or by power generation. The power supply mode used by the unit in combination with its own battery.