Research purposes:In order to meet the reliability and flexibility of power supply in railway junction area,large station and railway branch line,sub-section post of direct supply is usually set to expand feeding lines for independent power supply unit.Circuit breakers that are located at feeding lines of switching station and incoming lines of switching station and feeding lines of traction station form a multi-level protection.The research finds a more reasonable and more reliable protection scheme to solve the problem of overstepping trip due to poor protection in the actual operation.Research conclusions:(1) In view of the current development situation of relay protection device,it is proposed that the range of protection coordination should be reduced to 0.2 second from 0.3 second.(2) Two protection schemes are put forward according to relative position of substation and sub-section post.(3) Solutions of short circuit near substation and bus short circuit in sub-section post after protection adjustment are raised.(4) The research conclusion provides guidance for the protection setting and the setting calculation of substation and sub-section post,to give the guarantee of improving the reliability of power supply and reducing the scope of power cut and the time of power cut.%研究目的:在铁路枢纽地区、大型车站和铁路支线引入等处所,通常需要设置直供开闭所扩充馈线向独立供电单元供电,开闭所馈线、进线和牵引变电所馈线分别设置断路器,形成多级保护配合.但在实际运行中,经常出现保护配合不到位而造成越级跳闸、扩大停电范围等现象.基于此,本文拟找到一个更合理、更可靠的保护配置方案.研究结论:(1)针对当前继电保护装置的发展现状,建议保护配合级差由0.3s缩小至0.2s;(2)结合牵引变电所和开闭所在系统中的相对位置,确定了两种保护配置方案;(3)提出了保护调整后开闭所母线短路和变电所近端短路的解决方案;(4)该研究结论可用于指导电气化铁路牵引变电所、开闭所的保护设置和整定计算工作,可为提高供电可靠性、缩短停电范围和停电时间提供技术保障.
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