消防设备的两种供电方式：放射式和树干式

Two modes of power supply for fire fighting equipment: radial and trunk type.

消防设备的两种供电方式：放射式和树干式

Two modes of power supply for fire fighting equipment: radial and trunk type.

消防设备的配电设计中，消防水泵、喷淋水泵、水幕泵和消防电梯要由变配电站或主配电室直接出线，采用放射式供电；防烟排烟风机、防火卷帘以及疏散照明可采用放射式或树干式供电。

In the distribution design of fire-fighting equipment, fire-fighting water pump, sprinkler pump, water curtain pump and fire-fighting elevator should be directly outgoing from the power distribution station or the main distribution room, using radial power supply; smoke-proof exhaust fan, fire curtain and evacuation lighting can use radial or trunk power supply.

树干式配电是由电源引出一条供电回路(即供电干线)，多个用电负荷并联在这条供电回路上的供电方式。树干式配电的开关设备及线材消耗少，但在干线故障时，停电范围大，供电可靠性低;放射式配电是每一个用电负荷均从电源引出单独的供电回路，每个供电回路对应一个用电负荷，呈放射状布线;放射式配电的可靠性高，但线路和高压开关柜数量多。

Trunk distribution is a power supply circuit (i.e. trunk line) which is led by the power supply, and the power supply mode in which multiple power loads are connected in parallel on this power supply circuit. The switching equipment and wires of Trunk Distribution consume less, but the reliability of power supply is low when trunk line breaks down. Radial distribution is a separate power supply circuit from power supply for every electric load, and each power supply circuit corresponds to an electric load, which is radial distribution. Radial distribution has high reliability, but the line has low reliability. And the number of high voltage switchgear.

树干式配电和放射式配电是综合应用的。比如：在建筑物内，由总配电箱向楼层各配电点供电时，宜采用树干式配电或分区树干式配电;由楼层配电间或竖井内配电箱至用户配电箱的配电，宜采取放射式配电;实际应用中，更多的会采用放射式与树干式相结合的混合式配电，即同时采用放射式与树干式相结合的方式。以应急照明和疏散指示系统为例，应急照明和疏散指示系统的应急照明集中电源或应急照明配电箱，应采用专用的消防供电回路，宜采用树干式供电或分区树干式供电。

Trunk type distribution and radial distribution are integrated applications. For example: in buildings, when the main distribution box supplies power to each distribution point on the floor, trunk distribution or partitioned trunk distribution should be adopted; from the floor distribution room or shaft distribution box to user distribution box distribution should be adopted radial distribution; in practical application, more will be used radial and trunk combination of hybrid distribution. Electricity means simultaneous use of radiation and trunk. Taking emergency lighting and evacuation indication system as an example, the emergency lighting central power supply or emergency lighting distribution box of emergency lighting and evacuation indication system should adopt special fire power supply circuit, and trunk power supply or partition trunk power supply should be adopted.

对于容量较大的集中负荷或重要用电设备(电梯、消防水泵、加压水泵等)，应从低压配电室以放射式配电。以消防水泵、消防电梯为例，一用一备的两回路供电干线，均从低压配电室以放射式配电方式供电，在末端设置双回路切换装置。消防控制室、消防水泵房、防烟和排烟风机房的消防用电设备及消防电梯等的供电，应在其配电线路的最末一级配电箱处设置自动切换装置。其他消防设备的电源应能在每个防火分区配电间内自动切换。

For large capacity concentrated load or important electrical equipment (elevator, fire pump, pressurized water pump, etc.), should be from the low-voltage distribution room to radial distribution. Taking the water pump and fire elevator as an example, a standby two-circuit power supply trunk line is supplied by radial distribution from the low-voltage distribution room, and a double-circuit switching device is installed at the end. The power supply of fire-fighting electric equipment and fire-fighting elevator in fire-fighting control room, fire-fighting pump room, smoke-proof and smoke-exhausting fan room should be provided with automatic switching device at the last level of distribution box of the distribution line. The power supply of other fire fighting equipment should be automatically switched in each fire compartment distribution room.