模拟地铁杂散电流自动监测系统中电流测量技术手段研究

【作者】 孙雷；

【导师】 李永刚；

【作者基本信息】 首都师范大学 ， 通信与信息系统， 2004， 硕士

【摘要】 杂散电流对地铁周围的埋地金属管道、通讯电缆外皮以及地铁主体结构钢筋等发生电化学腐蚀，产生严重的危害。目前国内外对地铁杂散电流防护措施多采用被动的防护措施，尽管有些城市地铁实现了杂散电流的实时监测，并且有针对性进行人工治理，但目前还不能实现有效的自动监控并防治，任何采取积极主动的防护措施，从根源上来消除杂散电流的产生，在监测系统和自动防治上找到好的契合点，是一个涉及电子、自动测试、电防护领域的重大课题。 本文介绍了地铁杂散电流产生的机理、危害以及目前所采用的防护手段，提出了对地铁杂散电流实行自动监控电源补偿的防治方案；介绍了实验室模拟地铁杂散电流物理模型的设计和实现过程，在对电流测量手段进行分析的基础上，详细的说明了其电流自动监测系统的检测电路设计和参数选择过程；简要的介绍了监测系统的计算机运行界面；并对杂散电流模拟情况和实验结果进行了详细的分析。 通过系统调试和实验结果分析，证明该物理模型较好的模拟了实际地铁杂散电流的情况，其自动监测系统中检测电路的设计实现了在线监测，系统具有良好的线性度和稳定性，能够满足科研需要，为日后探讨自动监控电源补偿防治方案的有效性提供了实验基础和科研依据。更多还原

【Abstract】 Metro stray current causes serious electrochemical corrosion in metal pipelines, communication cable epidermis and rebars in concrete main structure buried underground nearby metro. Now the protection methods of metro stray current adopted in our country or abroad are almost passive. Though the monitoring systems of metro stray current and artificial protection work have been used and done in many cities, the efficient and automatic protection method has not been found. How to adopt active and effective protection method of metro stray current, to eliminate the resource of its generation and find good coalition between monitoring and auto-protecting is an important research problem involved in the research areas of electronics, auto-testing system and electrochemical corrosion protection.This paper introduces the generation mechanism and damages of metro stray current, and the protection methods now adopted in metro. Then a new protection project is expounded, which can protect metro stray current by means of monitoring and auto-compensating with power supply. The process of design and realization of metro modeling in laboratory is also introduced in particularly. Based on analyzing the methods of current testing, this paper explicates the design and parameter option process of testing circuit in model’s current auto-testing system. The computer user interface is also summarized. In the end of this paper, a detail analysis of the metro stray current condition in physical metro model and experiment data is .given.Through debugging this system and analyzing the data, experiments have proved that this physical model has reflected the current distribution in the metro rail, and the design of testing circuit in its auto-testing system has realized the current testing timely and efficiently. And this system’s linearity and stability are very good. So it can satisfy the need of research work, which would provide the experiment basis and data for the research of attesting the efficiency of the monitoring andauto-compensating project in the further.更多还原