Improvement Measures of TN - S Grounding System for Road Lighting

Liu Wanmin　Han Yagang（T. Y. Lin International Engineering Consulting（China）Co.，Ltd.，

Chongqing 401121，China）

 

Abstract The article describes the limitation of the application of T T grounding system for road lighting，and analyses in detail the grounding fault voltage of the TN - S grounding system，as well as the cooperation problem between the distribution circuit of road lighting and the grounding fault protection sensitivity of protective device，and puts forward corresponding improvement measures.  

Key words　Distribution circuit for road lighting　T T grounding type TN - S grounding type　Grounding fault voltage　Grounding fault protection　sensitivity of protective device　Repetitive grounding

 

摘　要　阐述 T T 接地系统在道路照明应用中的局限，详细分析 TN - S 接地系统的接地故障电压，以及道路照明配电回路与保护电器接地故障保护灵敏性间存在的配合问题，提出相应的改善措施。

关键词　道路照明配电回路 　T T 接地形式   TN - S 接地形式　接地故障电压　保护电器接地故障保护灵敏性　重复接地