高速铁路全并联AT牵引网异相短路阻抗特性及影响规律研究  

Research on Impedance Characteristics and Influence Laws of Phase-to-phase Faults of All Parallel Autotransformer Traction Network of High-speed Railway

作　　者：沈睿 韩正庆[1] 刘淑萍[1] 高仕斌[1] SHEN Rui;HAN Zhengqing;LIU Shuping;GAO Shibin(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学电气工程学院,四川成都611756

出　　处：《铁道学报》2022年第11期19-27,共9页Journal of the China Railway Society

基　　金：国家自然科学基金(51777174,52177116)。

摘　　要：阻抗特性是故障分析的基础。为了在多参数、多线路、多工况下分析异相短路的阻抗特性,在牵引变压器和全并联AT牵引网等值电路的基础上,计及牵引变压器漏抗、线路阻抗、AT漏抗和牵引负荷,推导异相短路故障分析电路和测量阻抗表达式。理论分析和仿真结果表明,异相短路的测量阻抗受过渡电阻、变压器联结组、变压器容量、牵引负荷和供电线长度的影响。当两供电臂变压器容量相等或超前相容量小于滞后相时,两供电臂的测量阻抗位于阻抗平面的第二、第四象限;当超前相容量大于滞后相,且过渡电阻较小时,测量阻抗分别位于第一、第三象限。Impedance characteristics are the basis of fault analysis.In order to analyze the impedance characteristics of phase-to-phase faults under multi-parameter,multi-line and multi-working conditions,based on the equivalent circuit of traction transformer and all-parallel autotransformer(AT)traction network,the phase-to-phase faults analysis circuit and measured impedance expression were derived by taking into account the leakage reactance of traction transformer,line impedance,leakage reactance of AT and traction load.Theoretical analysis and simulation results show that the measured impedance of phase-to-phase faults is affected by transition resistance,transformer coupling group,transformer rated power,traction load and length of power supply line.In case of equal transformer rated powers of the two power supply arms or less rated power of the leading phase than the lagging phase,the measured impedance of the two power supply arms is located in the second and fourth quadrant of the impedance plane.In case of greater rated power of the leading phase than the lagging phase and small transition resistance,the measured impedance is in the first and third quadrants.

关 键 词：阻抗特性 异相短路 全并联AT牵引网 测量阻抗 过渡电阻 

分 类 号：U225[交通运输工程—道路与铁道工程]