Analysis and Solutions of Axle Counter Red-light Band Issues on Hangzhou Metro Line 1

Abstract

Objective During the train commissioning and trial operation of Hangzhou Metro Line 1 Phase III section, abnormal occupancy (red-light band) appears in axle counter equipment at different positions along the line, significantly affecting metro operational safety. Therefore, it is necessary to carry out analysis and tests on abnormal interference scenarios, selecting appropriate improvement schemes to solve the abnormal occupation problem for axle counter equipment. Method The situation of abnormal interference and occupation during trains passing through the Phase III axle counting section is introduced. The relation between train traction equipment circuit return and axle counter equipment interference harmonics is analyzed, and relevant investigation, testing, and verification are conducted. Solutions for addressing the interference harmonics generated by the overlapping working frequency bands of train traction equipment and axle counter equipment are proposed. Result & Conclusion For the abnormal occupation (red-light band) situation during Line 1 Phase III project train passing through Phase III axle counting section, it is feasible to tackle the issue by optimizing train traction system equipment working frequency parameters. By shifting the working frequency band of train traction equipment away from that of the axle counter equipment, the issue of equipment co-frequency interference can be solved.

Keywords

• metro
• red-light band
• axle counter sensorinterference harmonics current