基于“车-网”同步电流的AT牵引网接地故障辨识方案

“EMUs-Network” Synchronous Current-based Ground Fault Identification Scheme for AT Traction Networks

随着高速铁路的快速发展,AT牵引网得到了广泛运用。然而,动车组性能的提高及测量阻抗与接地故障距离之间的非线性关系,使得距离保护的覆盖范围十分有限。通过建立考虑动车组运行的AT牵引网模型,揭示了接地故障下的电流分布特征。在此基础上,提出了一种基于“车-网”同步电流的接地故障辨识方案,该方案具有较高的故障辨识准确性,并且能区分接地故障和动车组。最后,通过MATLAB/Simulink仿真平台进行了案例研究,验证了所提方案在各种故障情况下的有效性。

The rapid development of high-speed railways has greatly facilitated wide application of AT traction networks.However,the performance boost of electric multiple units(EMUs) and the nonlinear relationship between the measured impedance and the distance to ground fault results in quite limited cover range of distance protection in AT traction networks.By modeling the AT traction network with operating EMUs and exploring the current distribution characteristics under the condition of ground fault,the present work proposed a ground fault identification scheme based on "EMUs-network" synchronous current.The scheme was expected to have high identification accuracy and satisfactory selectivity by well distinguishing ground faults with EMUs,and was preliminarily verified to be effective under various fault situations through a case simulation using MATLAB/Simulink.