铁路贯通/自闭线单相接地故障段定位方法

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。

METHOD OF SINGLE PHASE GROUNDING FAULT LOCATION FOR RAILWAY POWER SUPPLY LINE

Research purpose: According to many statistic of electric power faults, upwards of 80 percent are single phase grounding fault among all faults. In order to locate and isolate the fault rapidly, improve the reliability of railway power supply line. Researcy method: This article analyzed the distributing of zero sequence current when single phase grounding fault occurred along the circuitry. A fault location method based on General Matrix Arithmetic is proposed for railway power supply line, and the method is validated. Research result: The method composes a distributed system made up by STU, FTU and supervise terminal. abandoned the previous method, which locates faults by examining the zero sequence voltage and comparing the zero sequence current of each line in the electrical power station, use the zero sequence current of each switchgear spot only. Research conelusion: In condition of laboratory, the new method can locate and isolate faults within 10 seconds, it can provide reliable gist for fault lookup and elimination.