城市轨道交通信号系统倒切电路设计

城市轨道交通既有系统和新设系统的贯通与调试不能影响到既有信号系统的正常运营。针对调试期间室外设备运营时段由既有信号系统控制、非运营时段由新设信号系统控制产生的分时复用问题,介绍了一种利用双稳态继电器进行新旧系统切换的倒切电路。该倒切电路通过采用满足SIL 4安全级别的双稳态继电器实现室内新、旧系统对室外设备的分时控制,以及赋予不同人员的操作权限,从管理和技术两方面确保电路的安全性。在实际案例应用中,该倒切电路表现出操作简洁、安全性高、显示清晰等优点。

Design of the Switch Circuit of the Signal System in Urban Rail Transit

In urban rail transit,the normal operation of signal system can not be affected by the connection and debug of existing signal system and new signal system.In view of the outdoor equipment time division multiplexing problem,which is controlled by the existing signal system in operation and by the new signal system in non-operating period,a new type of circuit is introduced which uses bi-stable relay to switch the old and new systems.By adopting different contact points of the bi-stable relay that meets SIL 4 security level,the indoor old and new systems could control the outdoor equipment at different times,providing different people with different operation jurisdictions,in order to ensure the safety of switch circuit from both management and technology aspects.In practical application,the advantages of switch circuit,like simple operation,higher security,clear display and so on are verified.