城市軌道交通軌道電位的監測是維護城市軌道交通安全穩定運行的重要部分。文中提出了軌道電位在線監測系統的總體架構，利用Internet、地鐵局域網和CAN總線相結合
的通訊方式，對系統的各個組成部分進行了研究，給出了現場總線與局域網的接口解決方案并對系統所用的傳感器進行了設計。該系統已在地鐵現場進行了實驗驗證。結果表明，該系統對軌道電位監測實時準確，具有可靠性高，成本低等優點。
關鍵詞：局域網，軌道電位，監測，地鐵
Abstract: Urban mass transit rail potential monitoring is an important part of
maintenance its safe and stable running. The overall structure of on-line rail potential
monitoring system has been provided, by use of the Internet, LAN and CAN Bus
combination of means of communication. The various components of the system were
studied. Fieldbus and LAN interface solutions have been given and the sensor used
in the system has been designed. The system has been tested in the subway. The
results show that the monitoring system to rail potential with accurate and real-time is
high reliability and low cost advantages.
Keyword: local area network, rail potential, monitoring, metro