防护工程低压配电系统接地型式探讨  

Discussion on low-voltage power distribution system grounding forms in protective engineering

作　　者：葛福余 王金全[2] 刘辉 徐晔[2] 李乾[2] 

机构地区：[1]海军91053部队,北京100700 [2]解放军理工大学国防工程学院,江苏南京210007

出　　处：《防护工程》2014年第2期59-64,共6页Protective Engineering

摘　　要：防护工程低压配电系统采用的TN-S系统有很多优点，但这种系统要求接地电阻很小，在高电阻率的山体围岩内实现十分困难且成本巨大。分析了现有防护工程低压配电系统接地型式及其现状，认为防护工程低压配电系统宜采用IT8接地型式，并对这种接地型式下中性导体的绝缘监测、系统参数不对称运行状态、非线性负载运行情况、单相接地与中性导体接地运行等若干技术问题进行了探讨。最后，在剖析信息系统保护接地与信号接地机理的基础上，讨论了信息系统与配电系统共用接地时对接地电阻的要求。It has many advantages that the TN-S system is used in the low-voltage power distribution system of pro-tective engineering, but a small earthing resistance would be required in the TN-S system, and it is very difficult and expensive to realize in the protective engineering which is constructed in the surrounding rock. By analyzing the existing grounding types of the low-voltage power distribution system, it is suggested that the grounding form of ITN system （IT system with the neutral conductor） should be adopted in the low-voltage power distribution system of protective engineering, and a series of technical issues of ITN system is discussed such as the insulation detection on the neutral conductor, the unsymmetrical operations in system parameters, the operation with nonlinear loads, and a phase conductor earthing or the neutral conductor earthing. Finally, the requirement on the grounding resistance is deliberated in a common ground system with information technology equipment （ITE） on the basis of an analysis of the mechanism in protective earthing and signal grounding of ITE.

关 键 词：TN系统 IT系统 IT8系统 绝缘监测 信息系统 接地电阻 

分 类 号：TU856[建筑科学]