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To address the problem of insufficient operating speed caused by step-by-step setting coordination in traditional definite-time overcurrent protection for load-switch-based medium-voltage ring networks in urban regional railways, this paper proposes a fast protection method based on differential current. The fault section is identified using the fault characteristics of differential current, and the fault information is transmitted to the master station via the GOOSE network. The master station then controls the tripping of the outgoing circuit breaker at the substation to achieve rapid fault clearance. At the same time, the outgoing current of the substation is monitored. When the outgoing current drops below the preset threshold, a command is sent via the GOOSE network to control the tripping of the load switches on both sides of the fault section, completing the fault isolation. After fault isolation, the circuit breaker at the substation outgoing line and normally open point are closed to restore power supply to the healthy area. Simulation results show that under different fault types, locations, and transition resistances, the proposed method can achieve rapid protection operation and effective fault isolation, significantly improving protection speed and providing a reliable guarantee for the safe and stable operation of the load-switch-based medium-voltage ring network in urban regional railway systems based on load switches.

, authors=Chutian ZHANG, authorsList=Chutian ZHANG, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1308453926068572366, articleId=1308453925414260940, tenantId=1146029695717560320, journalId=1146123302524792850, language=CN, title=基于负荷开关的市域铁路中压环网快速保护与故障隔离方法, columnId=1152669334955536763, journalTitle=都市快轨交通, columnName=机电工程, runingTitle=null, highlight=null, articleAbstract=

传统定时限过流保护在基于负荷开关的市域铁路中压环网中，因逐级整定而导致速动性不足，针对此问题，提出一种基于差动电流的快速保护方法。该方法利用差动电流的故障特征定位故障区段，并通过GOOSE网络将故障信息上传至主变电站，由主变电站控制变配电所出线断路器跳闸，实现快速保护。同时监测变配电所出线电流，当变配电所出线电流下降至阈值时，通过GOOSE网络发送指令，控制故障区段两侧负荷开关跳闸，完成故障隔离。故障隔离后控制变配电所出线断路器和开环点合闸，恢复健全区域供电。仿真结果表明，在不同故障类型、位置和过渡电阻情况下，均能实现保护快速动作和故障有效隔离，显著提高保护速动性，为基于负荷开关的市域铁路中压环网的安全稳定运行提供可靠保障。

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章楚添，男，博士，高级工程师，从事铁路电力设计研究，3315448618@qq.com

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章楚添，男，博士，高级工程师，从事铁路电力设计研究，3315448618@qq.com

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