N-S供电系统的特点有哪些

  N-S供电系统的特点有哪些

  答:(1)系统正常运行时,专用保护线上不有电流,只是工作零线上有不平衡电流。 PE 线对地没有电压,所以电气设备金属外壳接零保护是接在专用的保护线 PE 上,安全可靠。

  (2)工作零线只用作单相照明负载回路。

  (3)专用保护线 PE 不许断线,也不许进入漏电开关。

  (4)干线上使用漏电保护器,工作零线不得有重复接地,而 PE 线有重复接地,但是不经过漏电保护器,所以 TN-S 系统供电干线上也可以安装漏电保护器。

  (5)TN-S方式供电系统安全可靠,适用于工业与民用建筑等低压供电系统。

Road Traffic Signs

Road traffic signs are graphical symbols that display traffic regulations and road information. They can make traffic regulations visually, concisely and concisely expressed. At the same time, they also express the content that is difficult to describe in words. They are used to manage traffic and indicate the direction of driving to ensure the smooth flow of roads and the safety of driving. Applicable to highways, urban roads and all special highways, with the nature of the law, vehicles, pedestrians must comply with.

Road Traffic Signs,Traffic Light Sign,Road Safety Signs,Highway Road Traffic Signs

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