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In case of occurrence of an incident in an electrical network, several hundreds of messages per minute may be presented to Control Center operators. This makes very difficult the identification of the fault and to decide about the required actions in order to minimize the consequences of the incident and to restore the service.This paper describes an expert system named SPARSE that provides on-line assistance to the operators of Substation Control Centers (SCC) of the portuguese electrical transmission network. SPARSE performs intelligent alarm processing and provides advice regarding operator actions. This system has been developed by the Faculty of Engineering of University of Porto in a joint project with Electricidade de Portugal, EDP, S.A., the utility that deals with power generation, transmission and distribution in Portugal.

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