基于电流特征的全并联AT分段供电牵引网保护方案
田开庆1，2，樊宇航3，罗璐1
(1 昆明铁道职业技术学院 电气工程学院，云南 昆明 650208；
2 昆明理工大学 电力工程学院，云南 昆明 650051；
3 昆明理工大学津桥学院 建筑工程学院，云南 昆明 650106)
摘 要：全并联自耦变压器(AT)分段供电牵引网能够克服传统全并联 AT 供电系统发生故障后上行或下行全线停电的问题。提出一种基于电流特征的全并联 AT 分段供电牵引网保护方案，该方案实时监测各区段首端电流并计算电流有效值，根据电流大小判断是否出现故障或者机车经过；构造差动电流判据，判断故障或机车经过的区段；计算满足差动电流判据区段首端电流的变化量，根据首端电流突变量的大小判断出是机车经过还是故障，若判断为故障，则断开故障区段两侧的断路器，隔离故障。PSCAD/EMTDC 电磁暂态仿真结果表明，该保护方案能够快速切除全并联 AT 分段供电牵引网的故障区段，保证非故障区段牵引网正常供电，缩小了停电范围，提高了全并联AT 牵引网的供电可靠性。
关键词： 全并联AT 牵引网；分段供电；差动保护；分布式保护
中图分类号：TM411+.3 ；TM922.3 文献标识码：B 文章编号：1007-3175(2025)10-0044-05
Protection Scheme for Fully Parallel Autotransformer Segmented Power
Supply Traction Network Based on Current Characteristics
TIAN Kai-qing1, 2, FAN Yu-hang3, LUO Lu1
（1 School of Electrical Engineering, Kunming Railway Vocational and Technical College, Kunming 650208, China;
2 School of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650051, China;
3 School of Architectural Engineering, Kunming University of Science and Technology Oxbridge College, Kunming 650106, China）
Abstract: The fully parallel autotransformer (AT) segmented power supply traction network can overcome the problem of the entire upstream or downstream power outage in the traditional fully parallel AT power supply system after a fault occurs. This paper proposes a fully parallel AT segmented power supply traction network protection scheme based on current characteristics. This scheme monitors the current at the beginning of each section in real time and calculates the effective value of the current. It determines whether a fault has occurred or whether a locomotive has passed based on the size of the current.Constructing differential current criteria to determine faults or the sections through which the locomotive passes. Calculating the variation of the current at the beginning of the section that meets the differential current criterion. Based on the magnitude of the sudden change in the current at the beginning, determine whether it is a locomotive passing through or a fault. If it is determined to be a fault, disconnect the circuit breakers on both sides of the faulty section to isolate the fault. The electromagnetic transient simulation results of PSCAD/EMTDC show that this protection scheme can quickly cut off the faulty sections of the fully parallel AT segmented power supply traction network, ensure the normal power supply of the traction network in the non-faulty sections,reduce the power outage range, and improve the power supply reliability of the fully parallel AT traction network.
Key words: fully parallel autotransformer traction network; sectionalized power supply; differential protection; distributed protection
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