关键词: 区段故障, 防护包络, U888信号系统, 自动开放条件, 基于通信的列车控制系统

Abstract: In the signaling system for urban rail transit, the Communication Based Train Control (CBTC) system is the main system for operating lines in China. For CBTC trains with normal train positioning and train-wayside communication, if a section fault occurs and the safety protection envelope of the downgraded train spreads to the faulty section, the faulty section will be considered by the interlocking system as occupied, so that the automatic clearing conditions of the route protection signal will not be met. Considering an actual case of section fault at Weiting Station on Suzhou Rail Transit Line 3, this paper analyzes the impacts of the protective envelope for train safety and the section fault when the brown and purple light strips are lit alternately to display the fault on the ATS interface. It also provides corresponding response measures and handling methods for operation and train management, which improves the efficiency of train operation commanding.

Key words: section fault, protective envelope, U888 signaling system, automatic clearing condition, Communication Based Train Control (CBTC) system