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00925njm 22002777a 4500 dc Martin, J author Mahou, A L author Soto, F J author Pastor, G author Corera, J author Criado, R author Ferrer, V author García-Santesmases, J M author 1998 SEACON is a hybrid (heuristic & algorithmic)expert system for contingency analysis and preventive or corrective control of the transmission network, that has been recently redesigned to implement new end user requirements and to increase its performance. This paper describes the main results and the operational experience from the development and implementation of a new system based on the initial idea. Software reuse strategies became capital in this project. The new design includes advanced functionalities demanded by the practical use of the former system. Because of the high performance of the new system (up to fifteen times faster than the original) and its friendly user interface, SEACON has become a very valuable tool among dispatchers. SEACON is in operation in the Red Electrica’s National Control Centre and in Iberdrola’s Central and Regional Control Centres, dealing with transmission and subtransmission networks (ranging between 4OOkV and 66kV), attached to the on-line state estimators and screening over 2000 possible contingencies. Results are presented using natural language, and a client-server scheme provided for corporate access. 0885-8950 10.1109/59.708783 https://hdl.handle.net/20.500.14352/57311 http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=599376 http://www.ieee.org Final implementation of SEACON: new scope and new open system platform.