Analysis and Solution Schemes for Interference on Metro Signaling System Axle Counting Equipment

Abstract

[Objective] During the system commissioning, train debugging and trial operation on Chengdu Metro Line 18, the axle counting equipment exhibits AIO (abnormal interference and occupation) due to various disturbances in different scenarios, significantly affecting metro operation safety. Therefore, it is necessary to analyze and conduct tests and experiments on various abnormal disturbance scenarios to select appropriate improvement schemes for resolving the issue of AIO in axle counting equipment. [Method] The AIO situations in the axle counting sections of the vehicle depot, in the axle counting section when train passes through phase division zones, and in the axle counting section during catenary power-off are introduced. Various scenarios of AIO in the axle counting equipment are analyzed, and relevant investigations, tests, and verifications are performed. Finally, solution schemes for different disturbance scenarios are proposed. [Result & Conclusion] For the AIO scenario in the axle counting section of the vehicle depot , the scheme of adding equalizing lines on the inner side of the front garage, and on track A and track B sides in the depot, along with the use of a new amplification board, can solve the problem. For the scenario of AIO in the axle counting section when train passes through phase division zones, the schemes of isolating interference, eliminating or weakening interference intensity can be implemented for the problem. For the scenario of AIO in the axle counting section during catenary power-off, the scheme of optimizing system grounding can solve the problem, where the weak flat steel is disconnected from the traction return path (rail), and then connected to station grounding grid, along with adaptive optimization of the parameters for the axle counting channel lightning protection module.

Keywords

• metro
• signaling system
• axle counting equipment