In order to obtain and use the incomplete information in the power grid fault diagnosis, a unified information model is proposed in this paper. The structure of the model is given, the extended CIM of IEC61970 is employed to describe the primary component topology and component parameters, and IEC61850 is employed to describe the secondary system. Further, the two models are harmonized by OWL. The proposed model can solve the information integrity and standardization issues of fault diagnosis, and make fault diagnosis system practical.
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