Ingenieur Vol 63 Ingenieur Vol 63 2015 | Page 28

INGENIEUR Figure A10: Control Loop of the Railway Signalling System. module. The electrical network is formed by nodes and branches. Fixed plants (substations, feeder connection points, etc.) form fixed nodes, whose locations do not change with time. Trains are moveable nodes, whose location change with time. From the locations of all nodes in the circuit, impedances (resistances) between nodes and ground and impedances (resistances) for branches between nodes are calculated for the given time instant. A set of Linear equations are then formed and solved. The solution process is an iterative process because the amount of a train’s power demand is dependent on the voltage level as in load flow algorithm. Figure A9 summarizes the process of modelling and simulation as deployed in the MM-TRAIN TM software. (B) Signalling and Control System The railway signalling and control system is needed for the safe control of transport by rail traffic. The objectives and tasks of the signalling and control can be defined as follows: 6 26 VOL – SEPTEMBER 2015 VOL63 55JULY JUNE 2013 Signalling Systems The signalling system ensures the safe control of transport processes.