关键词: 火灾自动报警系统, 电源总线, 供电设计, LNG 接收站

Abstract: The reliability of the system power supply of the automatic fire alarm system is related to whether the system can carry out alarm linkage according to the expectation after fire occurs. In design, the configuration of the system is usually determined by experience, and the impacts of the power bus on the stable operation of the system are often neglected for devices with more linkage, large load and far distance. Taking LNG terminal in gas power plant as an example, this paper deduces the impacts of power bus on the reliability of automatic fire alarm system based on the actual system composition, and gives three different power supply design schemes. This provide design reference for engineering designers so as to avoid failure of firefighting equipment to act reliably in the event of fire due to unreasonable cable cross-sectional area, length or system configuration.

Key words: automatic fire alarm system, power bus, power supply design, LNG terminal