摘要
结合工程设计实例,介绍TN-S系统与TT系统在城市道路照明工程中的应用和特点,对不同低压配电系统接地形式和不同位置发生接地故障时的危害和风险进行理论分析,以工程实例中的设计参数为依据分别计算TN-S系统与TT系统发生单相接地故障时的故障电流,研究道路照明配电系统和单个灯具的保护装置的选择,探讨剩余电流保护装置在城市道路照明配电系统中的应用及设计要求,并从项目运行管理的角度推荐更适合道路照明工程的接地形式。
Combined with engineering design examples,the application and characteristics of TN-S system and TT system in urban road lighting engineering are introduced,and the hazards and risks of grounding faults in different low-voltage distribution systems and different locations are analyzed theoretically.Based on the design parameters in the engineering example,the fault current of TN-S system and TT system when the single-phase grounding fault occurs is calculated respectively,the choice of protection device of road lighting distribution system and single lamps is studied,and the application and design requirements of residual current protection device in urban road lighting distribution system are discussed.From the point of view of project operation management,a more suitable grounding form for road lighting project is recommended.
作者
周畅
ZHOU Chang(Central&Southem China Municipal Engineering Design and Research Institute Co.Ltd.,Wuhan 430010,China)
出处
《电气开关》
2022年第5期76-80,共5页
Electric Switchgear
关键词
道路照明
接地形式
剩余电流保护器
单相接地短路
road lighting
grounding form
residual current protector
single phase to ground short circuit
