TT系统配电的路灯保护接地问题探讨

Discussion on Protective Grounding of Streetlight with Power Distributed by TT System

TT系统配电干线回路上的所有路灯采用共用的接地极,可防范第一次发生中性线接地、第二次发生相线接地的这种极端故障情况下的人身电击危害。但通过定量分析可知,采用一定的技术措施后,TT系统配电干线回路上的所有路灯采用各自的接地极,也可防范上述故障情况下的人身电击危害。

All streetlights on the distribution trunk circuit of TT system adopt a common grounding electrode, which is capable of protecting human body against electric shock in extreme failures such as first grounding of neutral line and secondary grounding of phase line. However, a quantitative analysis shows that human body can also be protected against electric shock mentioned above if all streetlights on the distribution trunk circuit of TT system adopt respective grounding electrodes after certain technical measures are taken.