| As the ultimate element in the electric power system, the safe of operating of transformer is correlative with the safety of the power system, so the condition assessment and fault diagnosis of transformer is of great importance. In this thesis, the questions are studied.In the aspects of transformer condition assessment, firstly, the multi-level and multi-stage framework of transformer condition assessment information is built, the target weights are figured out, then this paper built the assessment model of transformer condition assessment, examples are taken to prove the method to be correct and effective.And this paper introduces the data management and condition assessment expert system used SQL Server 2005 and Visual Studio 2005, which is simple and practical. The system runs steadily, and it can improve power transformer's state information management and maintenance efficiency. |