路灯线路电气安全防护系统的类型

Types of Electrical Safety Protections for Road Lighting

保护零线与电源中性点是用导体接通的，故障同路阻抗小，是接零保护系统；TN—C、TN—C降阻、TN—S、TN—S埋地等系统都属接零保护系统。保护零线与电源中性点没有导体接通的，故障回路阻抗大，是接地保护系统；IT和TT系统都属接地保护系统。文中摘录了国标GB14053—93中的系统接地型式。

In a zero sequence protection system,the protective zero line is connected wit the neutral point of the power supply; the impedance of the fault circuit is low. TN-C, TN-C Reduced Impedance, TN-S, and TN-S buried systems are all zero sequence protection systems. In a earthing protection system, the protective zero is not connected with the neutral point of the power supply; the impedance of the fault circuit is high. IT and TT systems are all earthing protection systems. This article has an excerpt of GB 14053-93 on the types of system earthing.