牵引供电网断线接地故障的阻抗模拟计算与仿真试验

The simulation calculation and simulation test on the impedance of grounding fault with interruption in traction power supply network

当客运专线AT供电牵引网发生接地故障时,馈线保护装置会发生拒动现象。针对这一现象,利用电路基本原理,采用数学方法建立故障模型并进行理论推导计算,将其与短路故障的阻抗进行比较分析,得出断线接地故障是一种高阻状态时的接地故障,阻值远大于短路时的阻抗,超出了馈线保护阻抗的整定值范围。利用Matlab/Simulink软件建立牵引网故障模型并进行了仿真验证,证明了本文理论推导计算的准确性,找到发生断线接地故障时馈线保护装置拒动的原因。

The feeding-line protection equipment will not operate when the all-parallel AT traction network is interrupted with grounding.Aiming at this phenomena,fault method has been established and calculated by mathematics method,the basic principle on circuit.The impedance got is compared to the impedance of short fault with the result that the grounding fault with interruption is a high-impedance grounding one.The impedance value is too much bigger than the short fault impedance,and exceeds the setpoint range of feeding-line protection impedance.In the paper,the using Matlab/Simulink software to establish traction network fault model and the simulation prove the accuracy of theoretical derivation and calculation in this article,and find the refuse reasons for feeding-line protection equipment when grounding fault with interruption.