低压配电系统中零线的研究

Research on the Zero Line in Low-Voltage Distribution System

低压配电系统中接地非常重要。电气施工人员对TN—S系统中重复接地的有关问题及要求不甚了解,在实际施工中出现一些问题。文章论述了低压系统的接地、TN接地系统、中性线断路(断零)的危害、重复接地的要求等,为防范"断零"烧毁设备事故,文中提出了在电气线路的设计、安装和管理中应注意事项。

The grounding is very important in the low-voltage distribution system. The electrical construction person- nel do not quite understand the related question and requirements on the repeat grounding in TN-S system, and exist some problems in the actual construction. This article discussed the grounding classification of low-voltage, TN grounding sys- tem, the hazard of the neutral line circuit broken（broken zero）, the requirements of repeat grounding, etc. In order to pre- vent ＂broken zero＂ burning equipment accidents, the author proposed the matters needing attention in the design, installa- tion and mangement of electric lines.