GIS隔离开关操作时,由于开关触头间的电弧击穿与重燃,会形成特快速暂态过电压(very fast transientover-voltage,VFTO)。VFTO具有电压幅值高、上升时间短及频带范围宽等特征,其产生的瞬态电磁场能通过空间或传导的方式耦合至二次电缆上...GIS隔离开关操作时,由于开关触头间的电弧击穿与重燃,会形成特快速暂态过电压(very fast transientover-voltage,VFTO)。VFTO具有电压幅值高、上升时间短及频带范围宽等特征,其产生的瞬态电磁场能通过空间或传导的方式耦合至二次电缆上。研制了能够适应强电磁环境应用的骚扰电压测量系统,在特高压GIS真型试验平台上开展了特高压VFTO对二次电缆骚扰电压的实测工作,并对测试结果进行了时域和频域分析;结合多导体传输线法与场线耦合理论,建立了外界电磁场对二次电缆骚扰的耦合模型,并进行了建模仿真。研究结果表明:当二次电缆的屏蔽层双端接地或在控制室单端接地时,二次电缆对由VFTO产生的电磁骚扰具有明显的抑制作用。实测与仿真研究结果可为特高压变电站内二次系统的抗电磁骚扰设计提供参考。展开更多
Based on the thought of the system engineering theory,the questions about the dynamic characteristics of vehicle-track coupling system on curved track and the vibration response of ballastless track structure of passe...Based on the thought of the system engineering theory,the questions about the dynamic characteristics of vehicle-track coupling system on curved track and the vibration response of ballastless track structure of passenger traffic railway are analyzed and are simulated research.The main searches are as follows:(1) Depending on the theory of vehicle-track coupling dynamic and finite element method,the motion state of each part of the vehicle-track coupling system is analyzed in particular.The dynamic models of vehicle structure,curve ballasted track structure,ballastless track structure are built separately.The rail/wheel contact model adopting FEM to calculate the rolling contact progress is brought forward.LM worn profiled wheel tread is adopted.Each part of the track structure model is built by real size and relation,and is simplified appropriately.The calculation about rail/wheel contact interaction is close to real status.The wheel can roll on the track,or glide relative to track,or separate from track.Thus,the phenomena of the vehicle’ climb on rail and derail are simulated. Through applying the wheel rotate velocity,the forward rolling of the wheel is realized,and then it is true more than giving a vehicle velocity.(2) Adopting ABAQUS software,the vehicle-track coupling system of Passenger Traffic Railway is simulated research.Explicit method and the contact penalty function method are used for calculation.In the contact calculation,constraint enforcement methods is described the pressure-overclosure behavior,contact surface weighting method & tracking approach are used to judged contact state,contact tangent action is described by corresponding sliding formulation.The calculate results show that adopting FEM to calculated rolling contact progress is feasible and the results is more exact.(3) Taking example by the engineering of rail traffic in a city,the dynamic characteristics of the vehicle-track coupling systems of ballasted track and ballastless track are simulated respectively.By contrasting the simu展开更多
文摘GIS隔离开关操作时,由于开关触头间的电弧击穿与重燃,会形成特快速暂态过电压(very fast transientover-voltage,VFTO)。VFTO具有电压幅值高、上升时间短及频带范围宽等特征,其产生的瞬态电磁场能通过空间或传导的方式耦合至二次电缆上。研制了能够适应强电磁环境应用的骚扰电压测量系统,在特高压GIS真型试验平台上开展了特高压VFTO对二次电缆骚扰电压的实测工作,并对测试结果进行了时域和频域分析;结合多导体传输线法与场线耦合理论,建立了外界电磁场对二次电缆骚扰的耦合模型,并进行了建模仿真。研究结果表明:当二次电缆的屏蔽层双端接地或在控制室单端接地时,二次电缆对由VFTO产生的电磁骚扰具有明显的抑制作用。实测与仿真研究结果可为特高压变电站内二次系统的抗电磁骚扰设计提供参考。
文摘Based on the thought of the system engineering theory,the questions about the dynamic characteristics of vehicle-track coupling system on curved track and the vibration response of ballastless track structure of passenger traffic railway are analyzed and are simulated research.The main searches are as follows:(1) Depending on the theory of vehicle-track coupling dynamic and finite element method,the motion state of each part of the vehicle-track coupling system is analyzed in particular.The dynamic models of vehicle structure,curve ballasted track structure,ballastless track structure are built separately.The rail/wheel contact model adopting FEM to calculate the rolling contact progress is brought forward.LM worn profiled wheel tread is adopted.Each part of the track structure model is built by real size and relation,and is simplified appropriately.The calculation about rail/wheel contact interaction is close to real status.The wheel can roll on the track,or glide relative to track,or separate from track.Thus,the phenomena of the vehicle’ climb on rail and derail are simulated. Through applying the wheel rotate velocity,the forward rolling of the wheel is realized,and then it is true more than giving a vehicle velocity.(2) Adopting ABAQUS software,the vehicle-track coupling system of Passenger Traffic Railway is simulated research.Explicit method and the contact penalty function method are used for calculation.In the contact calculation,constraint enforcement methods is described the pressure-overclosure behavior,contact surface weighting method & tracking approach are used to judged contact state,contact tangent action is described by corresponding sliding formulation.The calculate results show that adopting FEM to calculated rolling contact progress is feasible and the results is more exact.(3) Taking example by the engineering of rail traffic in a city,the dynamic characteristics of the vehicle-track coupling systems of ballasted track and ballastless track are simulated respectively.By contrasting the simu
