TN系统间接接触防护灵敏度校验及配电电缆长度的解析  

Indirect Contact Protection Sensitivity Check and Analysis of Distribution Cable Length in TN System

作　　者：王丹丹 WANG Dandan(Shanghai Municipal Planning and Design Institute Co.,Ltd.,Shanghai 200031,China)

机构地区：[1]上海市市政规划设计研究院有限公司,上海200031

出　　处：《现代建筑电气》2020年第11期14-17,共4页Modern Architecture Electric

摘　　要：结合某雨水泵站中潜污泵配电实例,探讨并计算了TN系统中采用断路器作为配电线路的过负荷保护、短路保护及间接接触防护电器时有关灵敏度校验问题,并计算了用断路器作间接接触防护时常用电动机配电电缆的最大允许长度。Combined with the distribution example of submersible sewage pumps in a rainwater pumping station,this paper discussed and calculated the sensitivity verification problems of overload protection,short circuit protection and indirect contact with protective appliances using circuit breakers as distribution lines in TN system.The maximum allowable length of commonly used motor distribution cables was calculated when using circuit breakers for indirect contact protection.

关 键 词：TN系统 接地故障电流 间接接触防护 配电线路的最大允许长度 

分 类 号：TU852[建筑科学]