系统外部短路条件下机车车辆适应性试验研究

Experimental study on the adaptability of locomotives and rolling stock under external system short circuits

近年来中国铁路高速发展,但对于车辆系统外部短路时车网之间的暂态过程尚未开展相关研究,系统短路阻抗特征尚不明确。针对以上问题,以国家铁道试验中心环行试验线为基础,建立环行试验线接触网对地短路的数学模型,研究短路点距离对接触网短路电流的影响,并通过构建基于DDRTS仿真平台的接触网短路试验半实物仿真模型对其进行验证,检验牵引变电所馈线保护单元参数设置和动作逻辑的正确性。在国家铁道试验中心环行试验线开展关于系统外部短路条件下机车车辆适应性试验,结果表明,接触网短路瞬间大电流不流经列车,接触网短路电流不会对列车造成不利影响。

In recent years,China's railway has developed rapidly,but the transient process between vehicle networks during external short circuits has not been studied,and the characteristics of the short-circuit impedance of the system are still unclear.To address these issues,based on the National Railway Test Center's circular test line,this article establishes a mathematical model of the overhead contact system short circuit to ground.It investigates the influence of the distance of the short circuit point on the short circuit current of the overhead contact system,and validates it through a semi-physical simulation model of the overhead contact system short circuit test based on the DDRTS simulation platform.This validation verifies the correctness of the parameter settings and action logic of the traction substation feeder protection unit.According to the research results,the adaptability test of locomotive and rolling stock under external short circuits is carried out in the loop test line of the National Railway Test Center.The results indicate that the large current during overhead contact system short circuits does not flow through the train instantaneously and the overhead contact system short circuit current does not adversely affect the train.