低压配电系统短路电流计算及校验分析  

Short Circuit Calculation and Verification Analysisin Low Voltage Distribution System

作　　者：杨蕊冰 李文瑞[1] Yang Ruibing;Li Wenrui(China Northwest Architectural Design and Research Institute Co.,Ltd,Xi’an 710018,China)

机构地区：[1]中国建筑西北设计研究院有限公司,西安710018

出　　处：《智能建筑电气技术》2023年第1期109-115,共7页Electrical Technology of Intelligent Buildings

摘　　要：短路电流计算、热稳定校验、保护校验是设计中的重要环节,但设计中往往被忽视。本文结合实际工程设计,计算配电系统不同位置的三相短路电流及单相接地故障短路电流,分析低压配电系统中各级断路器分断能力要求,探讨断路器的脱扣电流、保护校验及上下级保护配合,校验变电所低压侧小截面电缆回路的热稳定,为工程设计中断路器及电缆的选择提出合理建议及方法。Short circuit calculation and verification of thermal stability and protection are important parts in design,but always be ignored in fact.In this paper,combining a project,calculate three-phase short-circuit current and earthing fault current on different positions,analyze the requirement of circuit-breakers’breaking capacity in low voltage distribution system,discuss the tripping current of circuit-breakers,verification of protection,and protection coordination of upper and lower circuit breakers,and also check thermal stability of small section cable from low voltage distribution panel in substation.So as to provide reasonable suggestions and methods that used to select circuit-breaker and cable in designs.

关 键 词：短路电流计算 断路器 分断能力 热稳定性 保护校验 

分 类 号：TU852[建筑科学]