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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 104
PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
Paper 275

A New Control Relay for Automatic Transfer of Supplies for Signalling Applications

D.M. Van de Sype1, P. Hayt2 and S. Thiim3

1Unit of High Voltage, TUC RAIL, Brussels, Belgium
2Department of Electrical Engineering, Infrabel, Brussels, Belgium
3Thiim A/S, Herlev, Denmark

Full Bibliographic Reference for this paper
D.M. Van de Sype, P. Hayt, S. Thiim, "A New Control Relay for Automatic Transfer of Supplies for Signalling Applications", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 275, 2014. doi:10.4203/ccp.104.275
Keywords: voltage monitoring relay, automatic transfer switch, signalling supply, supply system, energy distribution, automatic transfer switch.

Summary
To improve the availability of the supply for signalling applications, an automatic transfer between 2 utility supplies is commonly used in the Belgian railway infrastructure. The control of this transfer is done by a voltage monitoring relay that was developed in-house in the 1960s. Though the relay has always been a very reliable product, it responds too nervous to small voltage dips and provokes as such unnecessary transfers. It is observed that the short interruptions resulting from these transfers occasionally disturb the signalling equipment and cause train delays. To solve this problem a new voltage monitoring relay is designed that reduces the number of unnecessary switch-overs to a minimum. The main features of this voltage monitoring relay are: single relay control, internal supply through measurement terminals, integrated contactor coil condition monitoring, microprocessor based and reprogrammable, straightforward settings with dials and DIP switches, wide voltage range with automatic detection of the nominal voltage and suited for 1-phase and 3-phase applications.

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