Abstract: GOOSE is the model of generic object oriented substation event defined in IEC 61850. It's very important for implementing co-operation between IEDs in smart substation. With rapid advances of the smart substation technology based on IEC61850,GOOSE has widespread application. We attempted to identify the mode of the transmission mechanism and work flow of UOOSE, and the real-time performances of two kinds of network topologies of GOOSE were evaluated by the OPNEI} simulation tool as well.

Key words: GOOSE, IEC61850 , OPNET, Real-time performance