The analysis of relay protection communication mechanism based on IEC61850

The traditional relay protection adapts cable hard-connections for signal transmission, which leads the structure composed of many isolated devices determined by the different functions and applications. The separation of different function and professional information leads to the special microstructure of relay protection devices and private secondary cable. The IEC 61850 is based on object-oriented modeling technology, appointing the relay protection communication in the aspects of communication model, data acquisition, data format, communication protocol and data application, enabling to realize the information mutual-recognition, information exchange and data sharing of cross-specialty, cross-application and cross-assembly. In this paper, it introduces the structure of SCD (Substation Configuration Description) Document, analyzing the formation of SCD and the process of configuring IED(Intelligent Electronic Device) with SCD to study the information sharing communication of digital substation. With relay protection GOOSE(Generic Object Oriented Substation Events) messages as communication example, it will analyze the protection device sampling, transmission, data processing, transferring trip GOOSE messages and the adapted relay protection communication process. Last but not least, to establish the assumption of configurable relay protection of the plug-and-play dynamic migration.