The choice of emergency lighting power supply should be determined according to the types of emergency lighting, conversion time, continuous working time, the characteristics of various power sources, and the objective needs and requirements of actual engineering. It is safe, reliable and technologically advanced. Economically reasonable.

a power supply from the grid separate from the normal feeder circuit

This kind of power supply has the characteristics of short conversion time (conversion time is easy to meet the requirements in various situations), long working time and reliable work. Therefore, this power application is more common. Especially in large and medium-sized cities and large and medium-sized factories, it is relatively easy to obtain such power. For public buildings and factories, due to production and work needs, when using grid backup power, you should first use it as emergency lighting power. It is not economical to set such a power supply specifically for emergency lighting. The emergency power supply and emergency lighting power supply for power equipment should be arranged in a comprehensive manner based on the actual situation of the local power and the actual situation of the project. For the standby lighting of the production and the standby lighting of the fire pump room, the same standby power source should be used for the production of electric equipment and fire pumps, which is generally obtained from the power grid.

Diesel generator set power supply

For the emergency generator set, since the motor is put into operation for a long time, the unit that is often in the backup state needs about 15s since the power-off time. Therefore, it can only be used as emergency lighting power for evacuation lighting and standby lighting, but cannot be used alone. Safety lighting. It is uneconomical and unreasonable to set up a generator set specifically for emergency lighting. In high-rise buildings, generator sets are often required to meet fire protection requirements; in some industrial production plants or communication and transportation centers, they are often considered together with the needs of production and operation of electrical equipment.

Battery power supply

The battery power can be divided into three types: the built-in battery in the lamp, the battery pack set up in a centralized manner, and the battery pack set in the partition. The built-in battery in the lamp is self-contained with power supply type emergency light. This way, the power supply has high reliability, the conversion is rapid and convenient, the line fault has no effect, and the battery damage has a small impact. The disadvantage is that the investment is large, the continuous lighting time is limited by the capacity, and the operation management and maintenance requirements are high. This method is suitable for buildings with a small number of emergency lighting, and a relatively scattered and small scale. The battery pack power supply set centrally or in a centralized manner has the advantages of high power supply reliability and rapid conversion, and has less investment compared with the self-contained battery method, and is convenient for management and maintenance. The disadvantage is that a special room is needed, and the battery failure affects a large area. When the power supply distance is long, the wire cross section is large, which will increase the copper consumption, and the fire prevention problem of the line should also be considered. This method is suitable for buildings with a large number of emergency lighting, concentrated lighting, and large scale. Therefore, important public buildings and important underground buildings are sometimes used in conjunction with other types of emergency lighting power supplies, which is more economical and reasonable. However, when such a power source is available in a building such as a computing station and the capacity can meet the requirements, the power source can be used as an emergency lighting power source in the site.

Combined power supply

That is, the power supply mode of any two or more of the above power sources is combined.

Due to the different structure and reliability of the above-mentioned power supplies, the requirements and application scope of the system are also different. Therefore, in practice, only selecting one type of emergency lighting power source is sometimes difficult to meet the requirements, and it is difficult to be safe, reliable, and economical. At this time, it is necessary to select two or more types of emergency lighting power sources.

When the emergency lighting power source is an independent power source taken from the power grid, two independent power sources are required to be externally supplied to ensure that when one road fails, the other road continues to work. The emergency lighting distribution system should be self-contained to ensure that the system can still supply power after the non-fire load is removed in the event of a fire. In this way, the power supply capacity and power supply time are not limited, and the conversion time is easy to meet the requirements. However, in the event of a major disaster, its power supply reliability may be destroyed. Therefore, it is not enough to use this method for emergency lighting power supply for large-scale high-rise buildings and some particularly important buildings. At this time, it is necessary to use generator sets or batteries as necessary supplements and enhancements for emergency lighting power.

The advantage of the power supply mode of the generator set is that the power supply capacity and the power supply time are basically unlimited. The disadvantage is that the conversion time is long and cannot be used for safety lighting and some standby lighting for places with high conversion time requirements. When it is needed for such a place, emergency lighting fixtures powered by battery packs should be used as transition lighting. High-rise buildings and some large-scale buildings that are particularly important should use this combination of generator and battery as the power supply for emergency lighting.

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