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研究目的:据大量的运行故障统计表明,中性点不接地系统发生单相接地故障约占系统总故障率的80％以上,本方法为了迅速定位并隔离故障区段,提高铁路贯通、自闭线的供电可靠性。研究方法:本文分析了线路发生单相接地故障时,零序电流的分布情况,基于改进的统一矩阵算法,提出一种针对铁路10 kV贯通、自闭线的故障段定位方案并加以验证。研究结果:该方案提出一种由FTU、STU和终端监控设备三个层次构成的分布式测控系统,舍去以往在电站检测零序电压、比较各出线零序电流等做法,仅使用各分段开关处的零序电流一个电量信息,根据各区段零序电流的相位和大小定位故障区段。研究结论:经过在实验室条件下的验证,该系统能在10秒内准确定位并隔离单相接地故障区段,同时也可以为故障的查找和排除提供可靠的依据。
Research purposes: According to a large number of operational failures statistics show that the neutral point ungrounded system occurs single-phase ground fault accounts for about 80% of the total system failure rate, the method in order to quickly locate and isolate the fault section, improve railway through, autistic Line power supply reliability. Research methods: In this paper, the distribution of zero-sequence current in the case of single-phase-to-ground fault on line is analyzed. Based on the improved uniform matrix algorithm, a fault segment positioning scheme for 10 kV penetration and self-closing railway line is proposed and verified. Research results: This scheme proposes a distributed measurement and control system consisting of three levels of FTU, STU and terminal monitoring equipment. The conventional zero-sequence current detection at power station is eliminated and the zero-sequence current of each outgoing line is compared. Only sub-sections The zero-sequence current at the switch is a power information, and the fault section is located according to the phase and the magnitude of the zero-sequence current in each section. Research conclusions: After verification under laboratory conditions, the system can accurately locate and isolate single-phase ground fault sections in 10 seconds, and can also provide a reliable basis for fault finding and elimination.