轨道交通杂散电流腐蚀的监测及防护研究

研究目的:分析地铁杂散电流腐蚀在线监测的原理,并对地铁杂散电流监测控制系统的软、硬件进行初步设计。同时对地铁杂散电流腐蚀防护措施提出看法。研究方法:结合地铁的实际情况及标准规定的杂散电流腐蚀危险性判定指标,选择埋地金属结构的极化电位作为监测的参数,采用具有电压稳定、不易极化、内阻低且具有一定机械强度的Cu／CuSO4作为参比电极; 测控系统硬件的核心是基于ARM7微处理器,其高速的性能、丰富的接口资源,很容易实现测控功能。研究结果:该研究总结出了可用于预测金属结构在杂散的腐蚀轻度和腐蚀趋势的自动在线监测系统。研究结论:尽管地铁杂散电流的腐蚀性大,但只要采取科学合理的措施,设计合理的自动在线监测系统, 有效地降低杂散电流腐蚀的损失,确保地铁长期运行使用的安全。

STUDY ON THE MONITORING AND CONTROL SYSTEM OF STRAY CURRENT IN URBAN MASS TRANSIT

Research purpose: This paper analyzed the online monitoring principle of the subway stray current,preliminarily design the monitor and control system in hardware and software. This paper also proposed the view on how to protect the corrosion of the stray current. Research method: Combining subway's actual conditions with the deciding target set in standards for the hazards of the stray current, selects polarized potential of the underground metal as the monitor parameter, utilizes Cu/CuSO4 as comparing electrode because of its qualities such as stable voltage, not easy to be polarized, low resistance and mechanical intensity. The core of the system's hardware is the microprocessor based on ARM7 whose high speed and rich connecting sources can easily realize the monitor and control function. Research result: This paper showed us the online monitor and control system for accuratly calculating the metal's corrosive degree and trend under the subway stray current. Research conclusion: Although the subway stray current is largly corrosive, as long as one can take scientific measures, design reasonable automatic online monitor and control system, effectively reduce the loss of current's corrosion, and one can ensure the subway's permanent safe operation.