摘要
CJJ45-2015《城市道路照明设计标准》规定,道路照明配电系统的接地形式应采用TT系统或TN-S系统。本文并不涉及TN-S系统和TT系统孰优孰劣的比较;另外,由于路灯照明负荷较小,且采用三相均匀供电,其供电半径一般会控制在500m左右,最远供电半径也会控制在1km左右,因此压降问题都能得到很好的控制。本文重点是对市政道路照明配电系统采用TN-S系统时的针对发生单相接地故障的配电保护分析,并给出合理化的意见。
CJJ45-2015 "Urban Road Lighting Design Standard"stipulates that TT system or TN-S system should be used in the grounding form of road lighting distribution system. This paper does not involve the comparison between TN-S system and TT system. In addition,because of the small illumination load of street lamps and the use of three-phase uniform power supply,the power supply radius will generally be controlled at about 500 m,and the farthest power supply radius will be controlled at about 1 km,so the voltage drop problem can be well controlled. This paper focuses on the analysis of distribution protection for single-phase grounding fault when TN-S system is used in municipal road lighting distribution system,and gives reasonable suggestions.
作者
方敏
Fang Min(Jiangxi Provicial General Institute of Urba&Rural Planning and Design,Nanchang 330000,China)
出处
《智能建筑电气技术》
2019年第6期128-131,共4页
Electrical Technology of Intelligent Buildings
关键词
TN-S接地系统
单相接地故障
剩余电流
等电位联结
TN-S grounding system
single-phase grounding fault
residual current
euipotential bonding
