三相四线TN-S接地制式下EPS柜系统接地方案探讨  

Exploration of Grounding Scheme of EPS Cabinet System under TN-S Grounding of Three-phase Four-wire System

作　　者：何铁峰[1] He Tiefeng

机构地区：[1]上海市隧道工程轨道交通设计研究院

出　　处：《隧道与轨道交通》2022年第4期20-22,66,共4页Tunnel and Rail Transit

摘　　要：EPS柜在应急工况下由蓄电池组经逆变器和输出隔离变压器供电的系统接地方案很少引起关注。很多设计案例都是参考2002年版《建筑电气工程施工质量验收规范》中对UPS电源输出端的接地要求进行规定。但是EPS电源与UPS电源的系统内部组成并不一致,完全参考UPS电源的接地要求并不可取,且存在一定的安全隐患。通过分析EPS柜内蓄电池组供电回路,提出了一种针对EPS柜的系统接地优化方案,可供类似工程参考和借鉴。There is little concern on the grounding scheme of EPS cabinets powered by battery packs through inverters and output isolation transformers in emergency conditions.Many design cases refer to the grounding requirements of UPS power supply output in Code of Acceptance of Construction Quality of Electrical Installation in Building(2002 edition).However,the components of EPS power supply and UPS power supply are not consistent.It is not reasonable to make reference to the UPS power supply grounding requirements completely and there are certain safety hazards.By the analysis of power supply circuit of battery pack in EPS cabinets,an optimized system grounding scheme for EPS cabinets is proposed,which could be referred for similar projects.

关 键 词：EPS柜 系统接地 输出隔离变压器 蓄电池组 应急切换装置 重复接地 

分 类 号：U231.91[交通运输工程—道路与铁道工程]