地铁接触网隔离开关直流传动电机监控装置的设计与应用

Design and Application of DC Motor Monitoring Device for Metro OCS Disconnect Switch

目的:地铁接触网隔离开关是接触网停、送电控制的重要部件,隔离开关的稳定分合工作直接关系到停、送电流程的准确执行。因此,要提升接触网系统隔离开关设备的故障侦测手段,尽早发现故障的前期潜在表征,降低该类问题的发生概率。方法:运营维护中,隔离开关故障可区分为机械类故障与电气类故障。对于多数故障部件的拆解分析显示,隔离开关设备在故障前存在诸多肉眼不易察觉的潜在隐患。及早发现、提先预警、提前介入,可以在很大程度上降低故障的发生并提升设备运行的可靠性。本项目的技术路线为通过在电机主回路中前置采样单元,开展开关电机分合时的电流-时间曲线录波,之后通过后台数字处理单元学习不同情况下的故障波形并开展关键特征比对,最终输出异常结果形成预警。结果及结论:本项目通过模拟隔离开关的典型故障,利用示波器开展设计与模型验证,最终制作出成熟、可靠的工业产品,大幅度地提升了现场在线设备的可靠性。

Objective:In metro OCS(overhead catenary system)disconnect switch is an important component controlling electrical current flow interruption or delivery.The stable operation of the disconnect switch directly affects the accurate execution of current interruption and delivery.Therefore,the fault detection means of OCS disconnect switch device needs to be improved to identify the potential early symptoms of these faults as soon as possible,which can lower the probability of problem occurrence and reduce the emergency response of the disconnect switch device before.Method:In operation and maintenance,disconnect switch faults can be divided into mechanical and electrical faults.The disassembly analysis of most faulty parts exposes many potential hazards that are difficult to detect with the naked eye before the fault occurs in the disconnect switch device.Early detection,early warning,and early intervention can greatly reduce the occurrence of faults and improve the reliability of equipment operation.The technical route of this project is to record the current-time curve of the switch motor opening and closing by pre-sampling the unit in the main circuit of the motor,and then study the fault waveforms in different situations through the back-end DPU(data processing unit)and compare key features,ultimately outputting abnormal results to form an early-warning.Result&Conclusion:By simulating typical faults of disconnect switches and using oscilloscopes for design and model validation,mature and reliable industrial products are ultimately developed,greatly improving the reliability of in-situ on-line equipment.