An Expert System Of Default Diagnosis Of Power Transformer

Fault diagnosis, the core instrument in power system has increasing importance to the safe, economic and stable operation of the power system. As the primary power equipment, power transformer plays a crucial role in the running procession of power system. Based on the features of oil immerged power transformers and the principle of faults diagnosis, the expert system based object-oriented method is developed to solve the intelligent diagnosis of transformer faults.The knowledge representation based on the fields of relational database and inference mechanisms based on relational database are introduced, the knowledge base system of transformer fault diagnosis is designed and realized, the table digraph of database is attached. According to the characteristics of transformer fault diagnosis, an inference mechanism based on mature relational database is designed to search, replace and construct the tables that correspond the faults to diagnosis. The fuzzy information graded and processed respectively is transformed to exact inferences.The knowledge representation of expert system and inference mechanisms based mature relational database technology are designed. Fuzzy information is graded, processed and transformed to several definite information unions, thus, the expert system only includes the definite inference processions. The inference is transformed the methods of searching, replacing and adding records, the database that corresponds the faults of transformers to diagnosis is constructed, the expert system can simulate many human experts with excellent memory, the massive inference procession is brought forward to the learning phase of the expert system, the combinational searching and simple inference are processed in the application of the expert system, the executing speed and efficiency of the expert system is advanced. Particularly, in expansion study, finite automata model based on records of relational database and knowledge inference is designed and the application automata theory to the procedure of inference is analyzed and studied, the inference mechanism discussed in this paper is compared with the inference mechanism utilizing automata, and the prepatation is too made for the subsequent related study.