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IEC 61850 "communication networks and systems in substation" is not only the most advanced and universal standard for communication but also a comprehensive system oriented standard for substation automation system (SAS). The feature of IEC 61850 is that it covers communication, qualitative properties of engineering tools, measures for quality management, and configuration management. Based on high speed peer to peer communications (publisher/subscriber concept), the generic object oriented system event (GOOSE) is a model to transmit status information in fast way to multi devices, and is applied to trips, blockings, and all indications for automatics. The paper presents a study about communications in SAS and supplies a detailed analysis of the process of transferring GOOSE message supported by MMS EASE Lite tool from the user's view point. The experiment results show the advantage of using such communication and MMS EASE Lite tool.