Abstract London Underground Limited (LUL) has a number of control systems utilising Supervisory Control And Data Acquisition (SCADA) equipment. The SCADA systems cover functional areas of the Underground’s railway operations. The scope of control of each system has evolved from single site supervision and control to entire Line orientated SCADA systems. A programme of co-location of function has been pursued by LUL. The co location of function has been carried out predominantly on a Line by Line basis, with the functions of signalling, communications, regulating the service and fault reporting and handling being amalgamated into one Line Service Centre for each Line. At present the functional areas are controlled by discrete SCADA systems i.e. separate signalling, communications, read more

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Abstract Electric Utility SCADA systems must be highly reliable given the potential for the SCADA system to directly contribute to load curtailment. This paper presents an analysis of SCADA system reliability in terms of its expected. aggregate contribution to load curtailment on the power system. Expressing this aggregate in system minutes and applying an appropriate damage cost function then provides an annual cost measure of SCADA system reliability worth. A composite generation and transmission system reliability evaluation technique is used to perform the numerical analysis of the joint SCADA and Power system model. This performs a Monte-Carlo simulation and includes an optimal power flow for enumerating gnd load curtailment states and analysis of SCADA system component read more

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