TN系统照明线路单相接地故障保护

Single-phase Grounding Protection of TN System Lighting Line

针对当前照明配电设计中出现的部分问题,如末端照明配电箱馈线供电半径过长,TN系统中馈线线路的间接接触防护电器切断故障回路的时间满足不了单相接地故障保护的要求,探讨了TN系统照明线路单相接地故障保护的方法。提出应结合项目设计的实际情况,选用正确的接地故障保护方法,以满足单相接地故障保护的要求。

If the feeder power supply radius of terminal lighting distribution box is too long in the design of lighting distribution,the time that the indirect contact protective appliance of feeder line cuts off the fault circuit cannot meet the requirements of single-phase grounding protection in TN system. This paper discussed the methods of grounding fault protection. It is pointed out that the correct grounding fault protection methods are selected according to the actual situation of the project design,in order to meet the requirements of single-phase grounding protection.