中文摘要：

接触网隔离开关的运行可靠性对于保障牵引供电系统稳定运行有着重要意义。针对隔离开关的机械状态特性,对电机电流与其输出扭矩之间的关系进行了推导。通过电机电流采集系统监测得到隔离开关电机电流信号,使用wolf算法计算得电机电流信号的最大李雅普诺夫指数值为正,证实了该电流信号具有混沌特性。根据相空间重构理论重构电流信号,对重构信号进行K-means聚类分析,获取簇中心并通过簇中心的位置变化判断隔离开关的故障情况。据此将隔离开关的故障情况进行分类,为隔离开关运行的故障监测以及状态评估提供依据。

英文摘要：

The operation reliability of isolation switches in the overhead contact system （OCS） is of great signifi- cance for the stable operation of the traction power supply system. According to the mechanical characteristics of the isolated switch ,the function relation between the motor current and the operating torque was deduced in this paper. It adopted the motor current acquisition system to obtain the current signal of the isolation switch and by using the Wolf algorithm it found out the maximum Lyapunov index of the current signal is positive, which shows that the current signal has chaotic characteristics. The current signal was reconstructed through the phase space reconstruction theory ,which was then analyzed by K-means clustering to obtain the cluster center, and the fault condition of the switch was judged by the change of the cluster center positions. On the above basis ,the fault condition of the isolated switch was classified, which may provide reference for fault monitoring and state evaluation of isolation switches.