基于電流特征的全并聯(lián)AT分段供電牽引網(wǎng)保護(hù)方案
田開慶1，2，樊宇航3，羅璐1
(1 昆明鐵道職業(yè)技術(shù)學(xué)院 電氣工程學(xué)院，云南 昆明 650208；
2 昆明理工大學(xué) 電力工程學(xué)院，云南 昆明 650051；
3 昆明理工大學(xué)津橋?qū)W院 建筑工程學(xué)院，云南 昆明 650106)
摘 要：全并聯(lián)自耦變壓器(AT)分段供電牽引網(wǎng)能夠克服傳統(tǒng)全并聯(lián) AT 供電系統(tǒng)發(fā)生故障后上行或下行全線停電的問題。提出一種基于電流特征的全并聯(lián) AT 分段供電牽引網(wǎng)保護(hù)方案，該方案實(shí)時(shí)監(jiān)測(cè)各區(qū)段首端電流并計(jì)算電流有效值，根據(jù)電流大小判斷是否出現(xiàn)故障或者機(jī)車經(jīng)過；構(gòu)造差動(dòng)電流判據(jù)，判斷故障或機(jī)車經(jīng)過的區(qū)段；計(jì)算滿足差動(dòng)電流判據(jù)區(qū)段首端電流的變化量，根據(jù)首端電流突變量的大小判斷出是機(jī)車經(jīng)過還是故障，若判斷為故障，則斷開故障區(qū)段兩側(cè)的斷路器，隔離故障。PSCAD/EMTDC 電磁暫態(tài)仿真結(jié)果表明，該保護(hù)方案能夠快速切除全并聯(lián) AT 分段供電牽引網(wǎng)的故障區(qū)段，保證非故障區(qū)段牽引網(wǎng)正常供電，縮小了停電范圍，提高了全并聯(lián)AT 牽引網(wǎng)的供電可靠性。
關(guān)鍵詞： 全并聯(lián)AT 牽引網(wǎng)；分段供電；差動(dòng)保護(hù)；分布式保護(hù)
中圖分類號(hào)：TM411+.3 ；TM922.3 文獻(xiàn)標(biāo)識(shí)碼：B 文章編號(hào)：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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