直流接地极引起的电气化铁路牵引变压器直流电流计算  

Calculation of DC Current Caused by DC Ground Electrode in Traction Transformer of Electrified Railway

作　　者：刘士利[1] 李承彬[1] 拾杨 钱成[1] 刘磊[1] 

机构地区：[1]东北电力大学电气工程学院,吉林132012 [2]国网北京经济技术研究院,北京102209

出　　处：《高电压技术》2017年第7期2161-2166,共6页High Voltage Engineering

摘　　要：为研究直流接地极对电气化铁路的影响,基于CDEGS软件建立了云—广±800 kV特高压直流输电工程鱼龙岭接地极及临近京广电气化铁路的仿真模型,分析了牵引变电站供电臂沿线轨道电位分布,计算了流经电气化铁路牵引变压器的直流电流,并研究了影响该直流电流大小的各个因素。分析结果表明,在同极性单极大地返回运行工况下,流过牵引变压器的直流平均电流为19.7 A,已超过普通电力变压器允许限值;流经牵引变的直流电流与接地极入地电流同向变化,接地极离铁路轨道越近,引起的直流电流越大,且接地极位于供电臂中垂线上时引起的直流电流最小。研究结果为直流输电工程接地极及铁路轨道设计提供了参考。In order to study the effects of UHVDC ground electrode on electrified railway, we established a model for simulating Yun-Guang ±800 kV UHVDC transmission project Yulongling electrode and Beijing-Guangzhou electrified railway on the basis of CDEGS software. Moreover, we analyzed the potential distribution along the orbit, calculated the current size flowing through electrified railway traction transformer, and studied the influencing factors of the current size The results show that when the preselected Yulongling grounding in polar monopole ground returns operation, the average value of traction transformer DC current will be 19.7 A, exceeding the average allowable value of power transformer. The current through traction transformer varies directly as the electrode current in earth. The closer electrode is to railway track, the larger current is in the traction transformer and the least direct current will be caused when the electrode is on the power supply arm midperpendicular. The results of the research can provide references for the design of UHVDC ground electrode and railway track.

关 键 词：直流接地极 电气化铁路 CDEGS 牵引变压器 供电臂 轨道电位 

分 类 号：U224.22[交通运输工程—道路与铁道工程]