摘要
为保证隧道内牵引网阻抗值计算的准确性和精确度,有必要对隧道中牵引网的阻抗特性计算理论和计算方法予以足够的重视。提出隧道中大地水平分层模型,推导了大地水平分层情况下隧道架空导线自阻抗和互阻抗计算表达式,考虑隧道内两根导线系统,计算导线阻抗,分析变化规律。算例分析表明:该方法计算隧道架空导线阻抗的电阻部分受第1层土壤电阻率影响较大,电抗部分几乎不受影响;第1层土壤在一定厚度内变化时,对隧道架空导线阻抗的电阻部分影响较大,而电抗部分与第1层土壤的厚度几乎无关,为大地水平分层情况下隧道架空导线阻抗计算提供理论依据。
The impedance of traction network is the basis of analysis and calculation of traction power supply system.In this paper,the penetration depth of electromagnetic wave in soil is calculated for the possibility of horizontal stratification of earth in the tunnel,and the impedance expression of overhead traverse and earth loop in the case of horizontal stratification of earth are derived.Combined with the two traverse systems in the tunnel,the conductor impedance is calculated and the variation rule is analyzed.The results show that the resistance of the calculation of the impedance of the traverseground loop is greatly affected by the first layer soil resistivity.When the thickness of the first layer of soil is less than 16 m,the resistance part of the impedance of the wireground loop is greatly affected,while the reactance part is hardly affected.It can be used as a reference to calculate the impedance of overhead traverse-ground loop when the ground is stratified.
作者
邢光兵
陈剑云
Xing Guangbing;Chen Jianyun(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,China)
出处
《华东交通大学学报》
2020年第5期9-14,共6页
Journal of East China Jiaotong University
基金
国家自然科学基金项目(51467004)。
关键词
电气化铁路
隧道
牵引网
阻抗
土壤电阻率
electrified railways
tunnel
traction network
impedance
soil conductivity
