UPS配电系统负载侧短路保护的选择性配合

刘浩恺（中铁电气化勘测设计研究院有限公司，天津市 300250）

Selective Coordination for Short - circuit Protection on Load Side in UPS Distribution System

LIU Haokai（China Railway Electrification Survey Design & Research Institute

Co.,Ltd.,Tianjin 300250，China）

Abstract：This paper introduces the structure and operating mode of UPS;analyzes the impact of UPS on short‑circuit current,including the response of UPS during load short‑circuit under normal external power supply and loss of external power supply,as well as the characteristics of UPS inverter and static bypass switch under short‑circuit current;explores the selective coordination for short‑circuit protection on load side in UPS.

Key words：uninterruptible power supply(UPS);selective coordination;low‑voltage distribution;short‑circuit protection;inverter;thyristor;current limiting

摘　要：介绍UPS的结构和运行模式；分析UPS对短路电流的影响，包括外电源正常时和UPS失去外电源两种情况下负载短路时UPS的响应，以及短路电流下UPS逆变器与静态旁路开关的特性；探讨UPS负载侧短路保护的选择性配合。

关键词：不间断电源（UPS）；选择性配合；低压配电；短路保护；逆变器；晶闸管；限流

中图分类号：TU852                　  文献标识码：A

doi：10.3969 / j. issn.1003 － 8493.2023.05.005