Abstract
At CompRail 1992, Mr P. Burnham presented a paper entitled Forward to the Past: Supervisory Control and Data Acquisition for London Underground's Power Network [1]. The paper discussed the possible configurations for a SCAD A system in a railway environment. The paper described the advantages and disadvantages of the various configurations in a qualitative manner. This new paper describes further work that has been performed to assess the existing and proposed SCADA system designs in a quantitative manner. The systems design are modelled using a communication network simulation package. Results showing the speed of system response are presented. The railway operating environment puts an unusual set of conditions on the SCADA system not normally found in general power system operation. The need to close down the power network at the end of service and the need to reconfigure the power system at the start of the service every day leads to a very large volume of communications traffic on the SCADA system. This mode of operation is investigated in this paper. The conclusions based on quantitative results discuss: the existing and proposed system under normal operation; the location of the communication bottlenecks with large volumes of communications traffic; and the expandability of the proposed parallel computer system.
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