基于增量磁导率的钢轨频变阻抗曲线计算  

Calculation of Frequency-dependent Impedance Curve of Rail Track Based on Incremental Permeability

作　　者：武伟康 陈剑云[2] 刘思然 傅钦翠[2] WU Weikang;CHEN Jianyun;LIU Siran;FU Qincui(China Railway Electrification Survey Design&Research Institute,CRL Group Co.,Ltd.,Tianjin 300250,China;State Key Laboratory of Performance Monitoring and Guarantee of Rail Transportation Infrastructure,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]中铁第六勘察设计院集团有限公司电气化设计院分公司,天津300250 [2]华东交通大学省部共建轨道交通基础设施性能监测与保障国家重点实验室,江西南昌330013

出　　处：《铁道学报》2021年第12期79-84,共6页Journal of the China Railway Society

摘　　要：宽频率范围的阻抗值是牵引供电系统进行谐波扰动、短路故障等暂态过程分析的基本参数,由于钢轨是铁磁材料,致使其在暂态过程下的阻抗特性与稳态下表现不同。对此问题展开研究,采用基于增量磁导率的有限元方法计算暂态情况下钢轨的频变阻抗;分析稳态大电流信号下钢轨的磁化特性,以P60钢轨的基本磁化曲线为计算基础,研究瞬态小电流信号下钢轨的局部磁滞曲线,并用增量磁导率表征这一局部磁化特性;将P60钢轨的增量磁导率等磁特性数据纳入到有限元Ansys Maxwell计算模型中,给出暂态情况下钢轨随频率(0~10 MHz)变化的阻抗频变曲线。计算结果表明,暂态情况下形成的增量磁场,使P60钢轨的交流电阻和内电感值与稳态情况下相比,在同一条件下均有所增大,且交流电阻值的差异主要在10 kHz频率以上,内电感值的差异主要在0~5000 Hz频率段。The impedance value of the wide frequency range is the basic parameter for the analysis of the transient process of the traction power supply system,such as harmonic disturbance and short circuit fault.Given the ferromagnetic material of the rail,its impedance characteristics in the transient process are different from those in the steady state.Therefore,this paper carried out research on the problem and proposed a finite element method based on incremental permeability to calculate the frequency-varying impedance of the rail under transient conditions.Firstly,the magnetization characteristics of the rail under steady-state high current signal were analyzed against the case of the basic magnetization curve of the P60 rail.The local hysteresis curve of the rail under transient low current signal was further studied.The incremental permeability was used to characterize this local magnetization characteristic.Finally,The magnetic characteristic data such as incremental permeability of the P60 rail were incorporated into the finite element software Ansys Maxwell calculation model,and the frequency-impedance curve of the rail with frequency variation(0~10 MHz)under transient condition was given.The results show that the incremental magnetic field generated in the transient condition increases the AC resistance and internal inductance of the P60 rail with frequency variation(0~10 MHz)under the same condition compared with the steady state,and the difference of AC resistance value is mainly above 10 kHz frequency,and the difference of internal inductance value is mainly in the frequency range of 0~5000 Hz.

关 键 词：钢轨 暂态信号 增量磁导率 频变阻抗曲线 有限元 

分 类 号：U225[交通运输工程—道路与铁道工程]