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Protective relaying and fault information systems are generally developed as closed systems before. However, because of proliferation of proprietary communication protocols and different data representations, the closed protective relaying and fault information systems lead to repeated huge cost to ensure interoperability and are difficult to exchange information with EMS (energy management system) and SAS (substation automation system). In order to solve above problems, a new relay protection and fault information systems' modeling approach is provided in this paper. Protective relaying and fault information systems are modeled in three levels. Levels 1 and 2 define the application data model. The third level describes abstract models and communication services used to exchange information between logical nodes. The model references IEC61850 and IEC61970 standard series. It is independent of the underlying communications. Considering the special requirements of protective relaying and fault information system, this model extended the CIM (common information model, which is defined in IEC61970) and IEC61850. A system based on the model can be interconnected seamlessly and exchange information with EMS and SAS more easily.