학술논문
隧道牵引分区所雷击暂态特性及其二次设备电磁兼容研究 / Study on Lightning Transient Characteristic of Tunnel Traction Sectioning Post and Electromagnetic Compatibility of Its Secondary Equipment
Document Type
Academic Journal
Author
Source
高压电器 / High Voltage Apparatus. 60(1):108-117
Subject
Language
Chinese
ISSN
1001-1609
Abstract
牵引供电系统遭受雷击会在分区所内产生过电压与过电流,对分区所开关柜中二次设备产生瞬态电磁干扰,影响其正常运行.文中针对电气化铁路隧道分区所,建立雷击暂态仿真模型,计算了接触网不同位置遭受雷击时分区所的过电压与过电流,建立了 27.5 kV开关柜的电磁场有限元仿真模型,分析开关柜中不同区域的瞬态电场、磁场分布.结果表明:雷击接触网会在分区所内产生幅值较大、频率较高的过电压与过电流,在其作用下开关柜低压室瞬态电场可达147.2 V/m、瞬态磁场可达1.3 kA/m,断路器室前壁处瞬态电场可达822.9 kV/m、瞬态磁场可达15.85 kA/m,超过标准规定的幅值,二次设备需要考虑相应的电磁屏蔽措施.论文结果对牵引供电系统雷击过电压/电流防护以及二次设备电磁兼容设计具有参考价值.
The traction power supply system can,in case of lightning strike,generate overvoltage and overcurrent in the sectioning post,produce transient electromagnetic interference to the secondary equipment in the switch cabinet of sectioning post and affect normal operation of the equipment.As for a tunnel sectioning post of electrification rail-way in this paper,the transient simulation under lightning strike is set up,the overvoltage and overcurrent are calcu-lated when the contact line is struck by lightning in different position,and the transient electric and magnetic field distribution in the 27.5 kV switch cabinet is calculated by using electromagnetic FEA model.The results show that,overvoltage and overcurrent with large amplitude and high frequency will be generated in the sectioning post when lightning strikes contact line,the transient electric field of low voltage compartment of switchgear cabinet can reach 147.2 V/s,the transient magnetic field can reach 15.85 kA/m,which exceeding the amplitude specified by the stan-dard.It is therefore necessary to consider the corresponding electromagnetic shielding measures for the secondary equipment.The results in this paper have certain reference for protection of overvoltage and overcurrent due to light-ning strikes of traction network and electromagnetic compatibility design of secondary equipment in the switch cabi-net.
The traction power supply system can,in case of lightning strike,generate overvoltage and overcurrent in the sectioning post,produce transient electromagnetic interference to the secondary equipment in the switch cabinet of sectioning post and affect normal operation of the equipment.As for a tunnel sectioning post of electrification rail-way in this paper,the transient simulation under lightning strike is set up,the overvoltage and overcurrent are calcu-lated when the contact line is struck by lightning in different position,and the transient electric and magnetic field distribution in the 27.5 kV switch cabinet is calculated by using electromagnetic FEA model.The results show that,overvoltage and overcurrent with large amplitude and high frequency will be generated in the sectioning post when lightning strikes contact line,the transient electric field of low voltage compartment of switchgear cabinet can reach 147.2 V/s,the transient magnetic field can reach 15.85 kA/m,which exceeding the amplitude specified by the stan-dard.It is therefore necessary to consider the corresponding electromagnetic shielding measures for the secondary equipment.The results in this paper have certain reference for protection of overvoltage and overcurrent due to light-ning strikes of traction network and electromagnetic compatibility design of secondary equipment in the switch cabi-net.