Stray Current Monitoring System
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SCMS Stray Current Monitoring System

I SCMS / STRAY CURRENT MONITORING SYSTEM Stray current definition The operation of DC traction systems requires suitable measures to prevent corrosion caused by stray currents on railway and non-railway installations. In this scope, the European standard EN50122-2:2011 (Annex B) recommends a continuous supervision of the rail insulation. Secheron Stray Current Monitoring System is a straightforward and efficient method of stray current monitoring avoiding manual repetitive measurement and any interference with the stray current collecting system. The system measures continuously the...

A healthy system’s presents a specific voltage profile called ‘’reference’’ or ‘’imprint’. A deficiency of insulation between the rail and the earth will modify this voltage distribution. The track potential can be used to ensure the healthy of the insulation and determine a modification in behavior of the stray current by comparison with the reference curves. Based on a rail potential measure. Advantages: • Measure more simple and practical • No interference with Stray Current Collecting System • Best arrangement to limit level of stray current Disadvantages: • Relative and indirect...

SCMS / STRAY CURRENT MONITORING SYSTEM Central Evaluation Unit (CEU) Functions of SCMS are performed at the CEU. The CEU includes an interface program to plot the real-time data being captured by the SCMS, as well as the data stored in the database. This interface program also allows the user to visualize the data in different ways, export the plotted data, perform various manual analyses of stored data and to parameter the SCMS. The CEU is designed with enough memory to keep at least 16 weeks of instantaneous values and archiving average values for 10 years. Stored data at the CEU is...

— Sechemn STRAY CURRENT MONITORING SYSTEM Short-term stored measures Representation in function of location • Typical values of the line potential during operation (digital imprint) • Reference the localization of the insulation deficiency *^5M*at« STRAY CURRENT HON I TORINO SYSTEM Short-term stared mi-.isun s Representation in function of time The short term values allows the analysis of insulation deficiency The long term values allows the analysis of tendency At the end of each day, the software generates automatically an analysis file of the data recorded during the day and saved it as...

SCMS / STRAY CURRENT MONITORING SYSTEM Measurement and certification of track The variation of the structure potential can be considered as null and so compliant with the requirement of EN50122-2 (<200mV). Before the recording of the reference data, Sécheron can provide the service of its earthing and bonding experts for the certification of the track. This expertise allows checks if the installation meets the characteristics defined in the standard EN50122-2: 2010: Rail resistance measure Conductance per length between running rails and structures Insulating rail joints certification Stray...

Data collection from VLD The Stray Current Monitoring System (SCMS) continuously collects datas from the Voltage Limiting Device (VLD) along the line: • voltage between the return circuit and the earth structure through a high accuracy sensor, • potential current flowing in the VLD through a high accuracy sensor, • VLD status. STRAY CURRENTS MONITORING SYSTEM How to manage stray current? • • • • • • • • • Floating negative return (ungrounded) Traction substation close to passenger station Traction substations reasonably spaced Continuously welded rail Track slab rebar electrically...

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