关于城市夜景照明接地的探讨

Discussion on Grounding Mode of Urban Night Scene Lighting

随着城市夜景照明的快速发展,对于夜景照明的配电,以及电气安全也越来越重要。本文主要讨论城市夜景照明电气安全中的接地安全,主要介绍了接地系统的基本概念与分类,并在遵守相关规范条文的基础上,通过计算分析,结合工程现场反馈的实际测量数据等案例,着重讨论计算了城市夜景照明中TN-S系统和TT系统的接地电阻值的选取。指出了一些现阶段常见做法存在的问题,并对其原因进行了分析,提出了改进建议。通过画图计算的方式,重点举例分析了TT接地系统在工程上的建议做法。最后通过比较分析,提醒广大电气设计师同行在做设计时要做到具体问题具体分析,根据每个项目的地理位置分布情况,结合项目现场的客观情况,综合考虑不同地区的土壤电阻率等因素,因地制宜地选取最优的接地方式以及相对比较合理的接地电阻值。

With the rapid development of the urban nightscape lighting,the power distribution and electrical safety of night scene lighting are becoming more and more important.This paper discusses the grounding safety in the electrical safety of urban nightscape lighting.It mainly introduces the basic concept and classification of the grounding system.On the basis of complying with the provisions of relevant specifications,through calculation and analysis,combined with the actual measurement data fed back from the project site and other cases,it focuses on the selection of the grounding resistance value of TN-S system and TT system in urban nightscape lighting.It points out the problems existing in some common practices at this stage,analyzes their causes,and puts forward suggestions for improvement.Through the way of drawing and calculation,this paper mainly analyzes the personal recommended practice of TT grounding system in engineering.Finally,through comparative analysis,it reminds the majority of electrical designers to analyze specific problems in their designs.According to the geographical location distribution of each project,combined with the objective situation of the project site,they should comprehensively consider factors such as soil resistivity in different regions,and select the optimal grounding method and relatively reasonable grounding resistance value according to the local conditions.